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/*******************************************************************************
* Copyright (c) 2000, 2022 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.graphics;
import java.util.*;
import org.eclipse.swt.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.cairo.*;
import org.eclipse.swt.internal.gtk.*;
/**
* Class GC is where all of the drawing capabilities that are
* supported by SWT are located. Instances are used to draw on either an
* Image, a Control, or directly on a Display.
*
*
Styles:
*
LEFT_TO_RIGHT, RIGHT_TO_LEFT
*
*
*
* The SWT drawing coordinate system is the two-dimensional space with the origin
* (0,0) at the top left corner of the drawing area and with (x,y) values increasing
* to the right and downward respectively.
*
*
*
* The result of drawing on an image that was created with an indexed
* palette using a color that is not in the palette is platform specific.
* Some platforms will match to the nearest color while other will draw
* the color itself. This happens because the allocated image might use
* a direct palette on platforms that do not support indexed palette.
*
*
*
* Application code must explicitly invoke the GC.dispose()
* method to release the operating system resources managed by each instance
* when those instances are no longer required. This is particularly
* important on Windows95 and Windows98 where the operating system has a limited
* number of device contexts available.
*
*
*
* Note: Only one of LEFT_TO_RIGHT and RIGHT_TO_LEFT may be specified.
*
* IMPORTANT: This field is not part of the SWT
* public API. It is marked public only so that it can be shared
* within the packages provided by SWT. It is not available on all
* platforms and should never be accessed from application code.
*
*
* @noreference This field is not intended to be referenced by clients.
*/
public long handle;
Drawable drawable;
GCData data;
/**
* The current Cairo matrix, which positions widgets in the shell.
* Client transformations come on top of this matrix.
*/
private double[] cairoTransformationMatrix;
/**
* Tracks the last transformation with which {@link #setTransform(Transform)} was called,
* so that we can answer clients of {@link #getTransform(Transform)}.
*/
private double[] currentTransform;
/**
* Original clipping set on this GC
*/
private Rectangle clipping;
final static int FOREGROUND = 1 << 0;
final static int BACKGROUND = 1 << 1;
final static int FONT = 1 << 2;
final static int LINE_STYLE = 1 << 3;
final static int LINE_CAP = 1 << 4;
final static int LINE_JOIN = 1 << 5;
final static int LINE_WIDTH = 1 << 6;
final static int LINE_MITERLIMIT = 1 << 7;
final static int BACKGROUND_BG = 1 << 8;
final static int DRAW_OFFSET = 1 << 9;
final static int DRAW = FOREGROUND | LINE_WIDTH | LINE_STYLE | LINE_CAP | LINE_JOIN | LINE_MITERLIMIT | DRAW_OFFSET;
final static int FILL = BACKGROUND;
static final float[] LINE_DOT = new float[]{1, 1};
static final float[] LINE_DASH = new float[]{3, 1};
static final float[] LINE_DASHDOT = new float[]{3, 1, 1, 1};
static final float[] LINE_DASHDOTDOT = new float[]{3, 1, 1, 1, 1, 1};
static final float[] LINE_DOT_ZERO = new float[]{3, 3};
static final float[] LINE_DASH_ZERO = new float[]{18, 6};
static final float[] LINE_DASHDOT_ZERO = new float[]{9, 6, 3, 6};
static final float[] LINE_DASHDOTDOT_ZERO = new float[]{9, 3, 3, 3, 3, 3};
GC() {
}
/**
* Constructs a new instance of this class which has been
* configured to draw on the specified drawable. Sets the
* foreground color, background color and font in the GC
* to match those in the drawable.
*
* You must dispose the graphics context when it is no longer required.
*
* @param drawable the drawable to draw on
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the drawable is null
*
ERROR_NULL_ARGUMENT - if there is no current device
*
ERROR_INVALID_ARGUMENT
* - if the drawable is an image that is not a bitmap or an icon
* - if the drawable is an image or printer that is already selected
* into another graphics context
*
* @exception SWTError
*
ERROR_NO_HANDLES if a handle could not be obtained for GC creation
*
ERROR_THREAD_INVALID_ACCESS if not called from the thread that created the drawable
*
* @see #dispose()
*/
public GC(Drawable drawable) {
this(drawable, 0);
}
/**
* Constructs a new instance of this class which has been
* configured to draw on the specified drawable. Sets the
* foreground color, background color and font in the GC
* to match those in the drawable.
*
* You must dispose the graphics context when it is no longer required.
*
*
* @param drawable the drawable to draw on
* @param style the style of GC to construct
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the drawable is null
*
ERROR_NULL_ARGUMENT - if there is no current device
*
ERROR_INVALID_ARGUMENT
* - if the drawable is an image that is not a bitmap or an icon
* - if the drawable is an image or printer that is already selected
* into another graphics context
*
* @exception SWTError
*
ERROR_NO_HANDLES if a handle could not be obtained for GC creation
*
ERROR_THREAD_INVALID_ACCESS if not called from the thread that created the drawable
*
*
* @see #dispose()
*
* @since 2.1.2
*/
public GC(Drawable drawable, int style) {
if (drawable == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
GCData data = new GCData();
data.style = checkStyle(style);
Device device = data.device;
if (device == null) device = Device.getDevice();
if (device == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
this.device = data.device = device;
long gdkGC = drawable.internal_new_GC(data);
init(drawable, data, gdkGC);
init();
}
/**
* Ensure that the style specified is either LEFT_TO_RIGHT or RIGHT_TO_LEFT.
*
* @param style the SWT style bit string
* @return If only one style is specified, it is return unmodified. If both styles are specified, returns LEFT_TO_RIGHT
*/
int checkStyle(int style) {
if ((style & SWT.LEFT_TO_RIGHT) != 0) style &= ~SWT.RIGHT_TO_LEFT;
return style & (SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT);
}
static void addCairoString(long cairo, String string, float x, float y, Font font) {
byte[] buffer = Converter.wcsToMbcs(string, true);
long layout = OS.pango_cairo_create_layout(cairo);
if (layout == 0) SWT.error(SWT.ERROR_NO_HANDLES);
OS.pango_layout_set_text(layout, buffer, -1);
OS.pango_layout_set_font_description(layout, font.handle);
double[] currentX = new double[1], currentY = new double[1];
Cairo.cairo_get_current_point(cairo, currentX, currentY);
if (currentX[0] != x || currentY[0] != y) {
Cairo.cairo_move_to(cairo, x, y);
}
OS.pango_cairo_layout_path(cairo, layout);
OS.g_object_unref(layout);
}
/**
* Convenience method that applies a region to the Control using cairo_clip.
*
* @param cairo the cairo context to apply the region to
*/
void cairoClipRegion (long cairo) {
if (cairo == 0) return;
GdkRectangle rect = new GdkRectangle ();
GDK.gdk_cairo_get_clip_rectangle (cairo, rect);
cairo_rectangle_int_t cairoRect = new cairo_rectangle_int_t ();
cairoRect.convertFromGdkRectangle(rect);
long regionHandle = data.regionSet;
long actualRegion = Cairo.cairo_region_create_rectangle(cairoRect);
Cairo.cairo_region_subtract(actualRegion, regionHandle);
GDK.gdk_cairo_region(cairo, actualRegion);
Cairo.cairo_clip(cairo);
Cairo.cairo_paint(cairo);
}
/**
* Invokes platform specific functionality to wrap a graphics context.
*
* IMPORTANT: This method is not part of the public
* API for GC. It is marked public only so that it
* can be shared within the packages provided by SWT. It is not
* available on all platforms, and should never be called from
* application code.
*
*
* @param handle the handle to the OS device context
* @param data the data for the receiver.
*
* @return a new GC
*
* @noreference This method is not intended to be referenced by clients.
*/
public static GC gtk_new(long handle, GCData data) {
GC gc = new GC();
gc.device = data.device;
gc.init(null, data, handle);
return gc;
}
/**
* Invokes platform specific functionality to allocate a new graphics context.
*
* IMPORTANT: This method is not part of the public
* API for GC. It is marked public only so that it
* can be shared within the packages provided by SWT. It is not
* available on all platforms, and should never be called from
* application code.
*
*
* @param drawable the Drawable for the receiver.
* @param data the data for the receiver.
*
* @return a new GC
*
* @noreference This method is not intended to be referenced by clients.
*/
public static GC gtk_new(Drawable drawable, GCData data) {
GC gc = new GC();
long gdkGC = drawable.internal_new_GC(data);
gc.device = data.device;
gc.init(drawable, data, gdkGC);
return gc;
}
void checkGC (int mask) {
int state = data.state;
if ((state & mask) == mask) return;
state = (state ^ mask) & mask;
data.state |= mask;
long cairo = data.cairo;
if ((state & (BACKGROUND | FOREGROUND)) != 0) {
GdkRGBA colorRGBA = null;
Pattern pattern;
if ((state & FOREGROUND) != 0) {
colorRGBA = data.foregroundRGBA;
pattern = data.foregroundPattern;
data.state &= ~BACKGROUND;
} else {
colorRGBA = data.backgroundRGBA;
pattern = data.backgroundPattern;
data.state &= ~FOREGROUND;
}
if (pattern != null) {
if ((data.style & SWT.MIRRORED) != 0 && pattern.surface != 0) {
long newPattern = Cairo.cairo_pattern_create_for_surface(pattern.surface);
if (newPattern == 0) SWT.error(SWT.ERROR_NO_HANDLES);
Cairo.cairo_pattern_set_extend(newPattern, Cairo.CAIRO_EXTEND_REPEAT);
double[] matrix = {-1, 0, 0, 1, 0, 0};
Cairo.cairo_pattern_set_matrix(newPattern, matrix);
Cairo.cairo_set_source(cairo, newPattern);
Cairo.cairo_pattern_destroy(newPattern);
} else {
Cairo.cairo_set_source(cairo, pattern.handle);
}
} else {
Cairo.cairo_set_source_rgba(cairo, colorRGBA.red, colorRGBA.green, colorRGBA.blue, data.alpha / (float)0xFF);
}
}
if ((state & FONT) != 0) {
if (data.layout != 0) {
Font font = data.font;
OS.pango_layout_set_font_description(data.layout, font.handle);
}
}
if ((state & LINE_CAP) != 0) {
int cap_style = 0;
switch (data.lineCap) {
case SWT.CAP_ROUND: cap_style = Cairo.CAIRO_LINE_CAP_ROUND; break;
case SWT.CAP_FLAT: cap_style = Cairo.CAIRO_LINE_CAP_BUTT; break;
case SWT.CAP_SQUARE: cap_style = Cairo.CAIRO_LINE_CAP_SQUARE; break;
}
Cairo.cairo_set_line_cap(cairo, cap_style);
}
if ((state & LINE_JOIN) != 0) {
int join_style = 0;
switch (data.lineJoin) {
case SWT.JOIN_MITER: join_style = Cairo.CAIRO_LINE_JOIN_MITER; break;
case SWT.JOIN_ROUND: join_style = Cairo.CAIRO_LINE_JOIN_ROUND; break;
case SWT.JOIN_BEVEL: join_style = Cairo.CAIRO_LINE_JOIN_BEVEL; break;
}
Cairo.cairo_set_line_join(cairo, join_style);
}
if ((state & LINE_WIDTH) != 0) {
Cairo.cairo_set_line_width(cairo, data.lineWidth == 0 ? DPIUtil.autoScaleUp(drawable, 1) : data.lineWidth);
switch (data.lineStyle) {
case SWT.LINE_DOT:
case SWT.LINE_DASH:
case SWT.LINE_DASHDOT:
case SWT.LINE_DASHDOTDOT:
state |= LINE_STYLE;
}
}
if ((state & LINE_STYLE) != 0) {
float dashesOffset = 0;
float[] dashes = null;
float width = data.lineWidth;
switch (data.lineStyle) {
case SWT.LINE_SOLID: break;
case SWT.LINE_DASH: dashes = width != 0 ? LINE_DASH : LINE_DASH_ZERO; break;
case SWT.LINE_DOT: dashes = width != 0 ? LINE_DOT : LINE_DOT_ZERO; break;
case SWT.LINE_DASHDOT: dashes = width != 0 ? LINE_DASHDOT : LINE_DASHDOT_ZERO; break;
case SWT.LINE_DASHDOTDOT: dashes = width != 0 ? LINE_DASHDOTDOT : LINE_DASHDOTDOT_ZERO; break;
case SWT.LINE_CUSTOM: dashes = data.lineDashes; break;
}
if (dashes != null) {
dashesOffset = data.lineDashesOffset;
double[] cairoDashes = new double[dashes.length];
for (int i = 0; i < cairoDashes.length; i++) {
cairoDashes[i] = width == 0 || data.lineStyle == SWT.LINE_CUSTOM ? dashes[i] : dashes[i] * width;
}
Cairo.cairo_set_dash(cairo, cairoDashes, cairoDashes.length, dashesOffset);
} else {
Cairo.cairo_set_dash(cairo, null, 0, 0);
}
}
if ((state & LINE_MITERLIMIT) != 0) {
Cairo.cairo_set_miter_limit(cairo, data.lineMiterLimit);
}
if ((state & DRAW_OFFSET) != 0) {
int effectiveLineWidth = data.lineWidth < 1 ? 1 : Math.round(data.lineWidth);
if (effectiveLineWidth % 2 == 1) {
// In case the effective line width is odd, shift coordinates by (0.5, 0.5).
// I.e., a line starting at (0,0) will effectively start in the pixel right
// below that coordinate with its center at (0.5, 0.5).
double[] offsetX = new double[] { 0.5 };
double[] offsetY = new double[] { 0.5 };
// The offset will be applied to the coordinate system of the GC; so transform
// it from the drawing coordinate system to the coordinate system of the GC by
// applying the inverse transformation as the one applied to the GC and correct
// it by the line width.
double[] matrix = new double[6];
Cairo.cairo_get_matrix(cairo, matrix);
double[] inverseMatrix = Arrays.copyOf(matrix, 6);
Cairo.cairo_matrix_invert(inverseMatrix);
Cairo.cairo_set_matrix(cairo, inverseMatrix);
Cairo.cairo_user_to_device_distance(cairo, offsetX, offsetY);
Cairo.cairo_set_matrix(cairo, matrix);
data.cairoXoffset = Math.abs(offsetX[0]);
data.cairoYoffset = Math.abs(offsetY[0]);
} else {
data.cairoXoffset = data.cairoYoffset = 0;
}
}
}
long convertRgn(long rgn, double[] matrix) {
long newRgn = Cairo.cairo_region_create();
if (isIdentity(matrix)) {
Cairo.cairo_region_union(newRgn, rgn);
return newRgn;
}
int[] nRects = new int[1];
long [] rects = new long [1];
Region.cairo_region_get_rectangles(rgn, rects, nRects);
cairo_rectangle_int_t rect = new cairo_rectangle_int_t ();
int[] pointArray = new int[8];
double[] x = new double[1], y = new double[1];
for (int i=0; iSWT.BITMAP.
*
* @param image the image to copy into
* @param x the x coordinate in the receiver of the area to be copied
* @param y the y coordinate in the receiver of the area to be copied
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the image is null
*
ERROR_INVALID_ARGUMENT - if the image is not a bitmap or has been disposed
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void copyArea(Image image, int x, int y) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (image == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (image.type != SWT.BITMAP || image.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
Point loc = DPIUtil.autoScaleUp(drawable, new Point(x, y));
copyAreaInPixels(image, loc.x, loc.y);
}
void copyAreaInPixels(Image image, int x, int y) {
long cairo = Cairo.cairo_create(image.surface);
if (cairo == 0) SWT.error(SWT.ERROR_NO_HANDLES);
Cairo.cairo_translate(cairo, -x, -y);
Cairo.cairo_push_group(cairo);
if (data.image != null) {
Cairo.cairo_set_source_surface(cairo, data.image.surface, 0, 0);
} else if (data.drawable != 0) {
if (!GTK.GTK4) GDK.gdk_cairo_set_source_window(cairo, data.drawable, 0, 0);
} else {
Cairo.cairo_destroy(cairo);
return;
}
Cairo.cairo_set_operator(cairo, Cairo.CAIRO_OPERATOR_SOURCE);
Cairo.cairo_paint(cairo);
Cairo.cairo_pop_group_to_source(cairo);
Cairo.cairo_paint(cairo);
Cairo.cairo_destroy(cairo);
}
/**
* Copies a rectangular area of the receiver at the source
* position onto the receiver at the destination position.
*
* @param srcX the x coordinate in the receiver of the area to be copied
* @param srcY the y coordinate in the receiver of the area to be copied
* @param width the width of the area to copy
* @param height the height of the area to copy
* @param destX the x coordinate in the receiver of the area to copy to
* @param destY the y coordinate in the receiver of the area to copy to
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void copyArea(int srcX, int srcY, int width, int height, int destX, int destY) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
Rectangle src = DPIUtil.autoScaleUp(drawable, new Rectangle(srcX, srcY, width, height));
Point dest = DPIUtil.autoScaleUp(drawable, new Point(destX, destY));
copyAreaInPixels(src.x, src.y, src.width, src.height, dest.x, dest.y);
}
void copyAreaInPixels(int srcX, int srcY, int width, int height, int destX, int destY) {
copyAreaInPixels(srcX, srcY, width, height, destX, destY, true);
}
/**
* Copies a rectangular area of the receiver at the source
* position onto the receiver at the destination position.
*
* @param srcX the x coordinate in the receiver of the area to be copied
* @param srcY the y coordinate in the receiver of the area to be copied
* @param width the width of the area to copy
* @param height the height of the area to copy
* @param destX the x coordinate in the receiver of the area to copy to
* @param destY the y coordinate in the receiver of the area to copy to
* @param paint if true paint events will be generated for old and obscured areas
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @since 3.1
*/
public void copyArea(int srcX, int srcY, int width, int height, int destX, int destY, boolean paint) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
Rectangle srcLoc = DPIUtil.autoScaleUp(drawable, new Rectangle(srcX, srcY, width, height));
Point destLoc = DPIUtil.autoScaleUp(drawable, new Point(destX, destY));
copyAreaInPixels(srcLoc.x, srcLoc.y, srcLoc.width, srcLoc.height, destLoc.x, destLoc.y, paint);
}
void copyAreaInPixels(int srcX, int srcY, int width, int height, int destX, int destY, boolean paint) {
if (width <= 0 || height <= 0) return;
int deltaX = destX - srcX, deltaY = destY - srcY;
if (deltaX == 0 && deltaY == 0) return;
long drawable = data.drawable;
if (data.image != null) {
Cairo.cairo_set_source_surface(handle, data.image.surface, deltaX, deltaY);
Cairo.cairo_rectangle(handle, destX, destY, width, height);
Cairo.cairo_set_operator(handle, Cairo.CAIRO_OPERATOR_SOURCE);
Cairo.cairo_fill(handle);
} else if (drawable != 0) {
Cairo.cairo_save(handle);
Cairo.cairo_rectangle(handle, destX, destY, width, height);
Cairo.cairo_clip(handle);
Cairo.cairo_translate(handle, deltaX, deltaY);
Cairo.cairo_set_operator(handle, Cairo.CAIRO_OPERATOR_SOURCE);
Cairo.cairo_push_group(handle);
if (!GTK.GTK4) GDK.gdk_cairo_set_source_window(handle, drawable, 0, 0);
Cairo.cairo_paint(handle);
Cairo.cairo_pop_group_to_source(handle);
Cairo.cairo_rectangle(handle, destX - deltaX, destY - deltaY, width, height);
Cairo.cairo_clip(handle);
Cairo.cairo_paint(handle);
Cairo.cairo_restore(handle);
if (paint) {
cairo_rectangle_int_t srcRect = new cairo_rectangle_int_t ();
srcRect.x = srcX;
srcRect.y = srcY;
srcRect.width = width;
srcRect.height = height;
long invalidateRegion = Cairo.cairo_region_create_rectangle (srcRect);
if (GTK.GTK4) {
/* TODO: GTK4 no ability to invalidate surfaces, may need to keep track of
* invalid regions ourselves and do gdk_surface_queue_expose */
} else {
long visibleRegion = GDK.gdk_window_get_visible_region (drawable);
long copyRegion = Cairo.cairo_region_create_rectangle (srcRect);
Cairo.cairo_region_intersect(copyRegion, visibleRegion);
Cairo.cairo_region_subtract (invalidateRegion, visibleRegion);
Cairo.cairo_region_translate (invalidateRegion, deltaX, deltaY);
GDK.gdk_window_invalidate_region(drawable, invalidateRegion, false);
Cairo.cairo_region_destroy (visibleRegion);
Cairo.cairo_region_destroy (copyRegion);
}
Cairo.cairo_region_destroy (invalidateRegion);
}
}
if (data.image == null && paint) {
boolean disjoint = (destX + width < srcX) || (srcX + width < destX) || (destY + height < srcY) || (srcY + height < destY);
GdkRectangle rect = new GdkRectangle ();
if (disjoint) {
rect.x = srcX;
rect.y = srcY;
rect.width = Math.max (0, width);
rect.height = Math.max (0, height);
if (GTK.GTK4) {
/* TODO: GTK4 no ability to invalidate surfaces, may need to keep track of
* invalid regions ourselves and do gdk_surface_queue_expose */
} else {
GDK.gdk_window_invalidate_rect (drawable, rect, false);
}
} else {
if (deltaX != 0) {
int newX = destX - deltaX;
if (deltaX < 0) newX = destX + width;
rect.x = newX;
rect.y = srcY;
rect.width = Math.abs(deltaX);
rect.height = Math.max (0, height);
if (GTK.GTK4) {
/* TODO: GTK4 no ability to invalidate surfaces, may need to keep track of
* invalid regions ourselves and do gdk_surface_queue_expose */
} else {
GDK.gdk_window_invalidate_rect (drawable, rect, false);
}
}
if (deltaY != 0) {
int newY = destY - deltaY;
if (deltaY < 0) newY = destY + height;
rect.x = srcX;
rect.y = newY;
rect.width = Math.max (0, width);
rect.height = Math.abs(deltaY);
if (GTK.GTK4) {
/* TODO: GTK4 no ability to invalidate surfaces, may need to keep track of
* invalid regions ourselves and do gdk_surface_queue_expose */
} else {
GDK.gdk_window_invalidate_rect (drawable, rect, false);
}
}
}
}
}
void createLayout() {
long context;
if (GTK.GTK4) {
long fontMap = OS.pango_cairo_font_map_get_default ();
context = OS.pango_font_map_create_context (fontMap);
} else {
context = GDK.gdk_pango_context_get();
}
if (context == 0) SWT.error(SWT.ERROR_NO_HANDLES);
data.context = context;
long layout = OS.pango_layout_new(context);
if (layout == 0) SWT.error(SWT.ERROR_NO_HANDLES);
data.layout = layout;
OS.pango_context_set_language(context, GTK.gtk_get_default_language());
OS.pango_context_set_base_dir(context, (data.style & SWT.MIRRORED) != 0 ? OS.PANGO_DIRECTION_RTL : OS.PANGO_DIRECTION_LTR);
OS.pango_layout_set_auto_dir(layout, false);
}
void disposeLayout() {
data.string = null;
if (data.context != 0) OS.g_object_unref(data.context);
if (data.layout != 0) OS.g_object_unref(data.layout);
data.layout = data.context = 0;
}
@Override
void destroy() {
if (data.disposeCairo) {
long cairo = data.cairo;
Cairo.cairo_destroy(cairo);
}
data.cairo = 0;
/* Free resources */
long clipRgn = data.clipRgn;
if (clipRgn != 0) Cairo.cairo_region_destroy(clipRgn);
Image image = data.image;
if (image != null) {
image.memGC = null;
if (image.transparentPixel != -1) image.createMask();
}
disposeLayout();
/* Dispose the GC */
if (drawable != null) {
drawable.internal_dispose_GC(handle, data);
}
data.drawable = data.clipRgn = 0;
drawable = null;
handle = 0;
data.image = null;
data.string = null;
data = null;
}
/**
* Draws the outline of a circular or elliptical arc
* within the specified rectangular area.
*
* The resulting arc begins at startAngle and extends
* for arcAngle degrees, using the current color.
* Angles are interpreted such that 0 degrees is at the 3 o'clock
* position. A positive value indicates a counter-clockwise rotation
* while a negative value indicates a clockwise rotation.
*
* The center of the arc is the center of the rectangle whose origin
* is (x, y) and whose size is specified by the
* width and height arguments.
*
* The resulting arc covers an area width + 1 points wide
* by height + 1 points tall.
*
*
* @param x the x coordinate of the upper-left corner of the arc to be drawn
* @param y the y coordinate of the upper-left corner of the arc to be drawn
* @param width the width of the arc to be drawn
* @param height the height of the arc to be drawn
* @param startAngle the beginning angle
* @param arcAngle the angular extent of the arc, relative to the start angle
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void drawArc(int x, int y, int width, int height, int startAngle, int arcAngle) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
Rectangle loc = DPIUtil.autoScaleUp(drawable, new Rectangle(x, y, width, height));
drawArcInPixels(loc.x, loc.y, loc.width, loc.height, startAngle, arcAngle);
}
void drawArcInPixels(int x, int y, int width, int height, int startAngle, int arcAngle) {
checkGC(DRAW);
if (width < 0) {
x = x + width;
width = -width;
}
if (height < 0) {
y = y + height;
height = -height;
}
if (width == 0 || height == 0 || arcAngle == 0) return;
long cairo = data.cairo;
double xOffset = data.cairoXoffset, yOffset = data.cairoYoffset;
if (width == height) {
if (arcAngle >= 0) {
Cairo.cairo_arc_negative(cairo, x + xOffset + width / 2f, y + yOffset + height / 2f, width / 2f, -startAngle * (float)Math.PI / 180, -(startAngle + arcAngle) * (float)Math.PI / 180);
} else {
Cairo.cairo_arc(cairo, x + xOffset + width / 2f, y + yOffset + height / 2f, width / 2f, -startAngle * (float)Math.PI / 180, -(startAngle + arcAngle) * (float)Math.PI / 180);
}
} else {
Cairo.cairo_save(cairo);
Cairo.cairo_translate(cairo, x + xOffset + width / 2f, y + yOffset + height / 2f);
Cairo.cairo_scale(cairo, width / 2f, height / 2f);
if (arcAngle >= 0) {
Cairo.cairo_arc_negative(cairo, 0, 0, 1, -startAngle * (float)Math.PI / 180, -(startAngle + arcAngle) * (float)Math.PI / 180);
} else {
Cairo.cairo_arc(cairo, 0, 0, 1, -startAngle * (float)Math.PI / 180, -(startAngle + arcAngle) * (float)Math.PI / 180);
}
Cairo.cairo_restore(cairo);
}
Cairo.cairo_stroke(cairo);
}
/**
* Draws a rectangle, based on the specified arguments, which has
* the appearance of the platform's focus rectangle if the
* platform supports such a notion, and otherwise draws a simple
* rectangle in the receiver's foreground color.
*
* @param x the x coordinate of the rectangle
* @param y the y coordinate of the rectangle
* @param width the width of the rectangle
* @param height the height of the rectangle
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see #drawRectangle(int, int, int, int)
*/
public void drawFocus(int x, int y, int width, int height) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
Rectangle loc = DPIUtil.autoScaleUp(drawable, new Rectangle(x, y, width, height));
drawFocusInPixels(loc.x, loc.y, loc.width, loc.height);
}
void drawFocusInPixels(int x, int y, int width, int height) {
long cairo = data.cairo;
checkGC(FOREGROUND);
long context = GTK.gtk_widget_get_style_context(data.device.shellHandle);
GTK.gtk_render_focus(context, cairo, x, y, width, height);
}
/**
* Draws the given image in the receiver at the specified
* coordinates.
*
* @param image the image to draw
* @param x the x coordinate of where to draw
* @param y the y coordinate of where to draw
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the image is null
*
ERROR_INVALID_ARGUMENT - if the image has been disposed
*
ERROR_INVALID_ARGUMENT - if the given coordinates are outside the bounds of the image
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
* @exception SWTError
*
ERROR_NO_HANDLES - if no handles are available to perform the operation
*
*/
public void drawImage(Image image, int x, int y) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (image == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (image.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
Point loc = DPIUtil.autoScaleUp(drawable, new Point(x, y));
drawImageInPixels(image, loc.x, loc.y);
}
void drawImageInPixels(Image image, int x, int y) {
drawImage(image, 0, 0, -1, -1, x, y, -1, -1, true);
}
/**
* Copies a rectangular area from the source image into a (potentially
* different sized) rectangular area in the receiver. If the source
* and destination areas are of differing sizes, then the source
* area will be stretched or shrunk to fit the destination area
* as it is copied. The copy fails if any part of the source rectangle
* lies outside the bounds of the source image, or if any of the width
* or height arguments are negative.
*
* @param image the source image
* @param srcX the x coordinate in the source image to copy from
* @param srcY the y coordinate in the source image to copy from
* @param srcWidth the width in points to copy from the source
* @param srcHeight the height in points to copy from the source
* @param destX the x coordinate in the destination to copy to
* @param destY the y coordinate in the destination to copy to
* @param destWidth the width in points of the destination rectangle
* @param destHeight the height in points of the destination rectangle
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the image is null
*
ERROR_INVALID_ARGUMENT - if the image has been disposed
*
ERROR_INVALID_ARGUMENT - if any of the width or height arguments are negative.
*
ERROR_INVALID_ARGUMENT - if the source rectangle is not contained within the bounds of the source image
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
* @exception SWTError
*
ERROR_NO_HANDLES - if no handles are available to perform the operation
*
*/
public void drawImage(Image image, int srcX, int srcY, int srcWidth, int srcHeight, int destX, int destY, int destWidth, int destHeight) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (srcWidth == 0 || srcHeight == 0 || destWidth == 0 || destHeight == 0) return;
if (srcX < 0 || srcY < 0 || srcWidth < 0 || srcHeight < 0 || destWidth < 0 || destHeight < 0) {
SWT.error (SWT.ERROR_INVALID_ARGUMENT);
}
if (image == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (image.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
Rectangle destRect = DPIUtil.autoScaleUp(drawable, new Rectangle(destX, destY, destWidth, destHeight));
drawImage(image, srcX, srcY, srcWidth, srcHeight, destRect.x, destRect.y, destRect.width, destRect.height, false);
}
void drawImage(Image srcImage, int srcX, int srcY, int srcWidth, int srcHeight, int destX, int destY, int destWidth, int destHeight, boolean simple) {
/* Refresh Image as per zoom level, if required. */
srcImage.refreshImageForZoom ();
ImageData srcImageData = srcImage.getImageData();
int imgWidth = srcImageData.width;
int imgHeight = srcImageData.height;
if (simple) {
srcWidth = destWidth = imgWidth;
srcHeight = destHeight = imgHeight;
} else {
simple = srcX == 0 && srcY == 0 &&
srcWidth == destWidth && destWidth == imgWidth &&
srcHeight == destHeight && destHeight == imgHeight;
if (srcX + srcWidth > imgWidth + 1 || srcY + srcHeight > imgHeight + 1) { //rounding error correction for hidpi
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
}
long cairo = data.cairo;
if (data.alpha != 0) {
srcImage.createSurface();
Cairo.cairo_save(cairo);
if ((data.style & SWT.MIRRORED) != 0) {
Cairo.cairo_scale(cairo, -1f, 1);
Cairo.cairo_translate(cairo, - 2 * destX - destWidth, 0);
}
Cairo.cairo_rectangle(cairo, destX , destY, destWidth, destHeight);
Cairo.cairo_clip(cairo);
if (srcWidth != destWidth || srcHeight != destHeight) {
float scaleX = destWidth / (float)srcWidth;
float scaleY = destHeight / (float)srcHeight;
Cairo.cairo_translate(cairo, destX - (int)(srcX * scaleX), destY - (int)(srcY * scaleY));
Cairo.cairo_scale(cairo, scaleX, scaleY);
} else {
Cairo.cairo_translate(cairo, destX - srcX, destY - srcY);
}
int filter = Cairo.CAIRO_FILTER_GOOD;
switch (data.interpolation) {
case SWT.DEFAULT: filter = Cairo.CAIRO_FILTER_GOOD; break;
case SWT.NONE: filter = Cairo.CAIRO_FILTER_NEAREST; break;
case SWT.LOW: filter = Cairo.CAIRO_FILTER_FAST; break;
case SWT.HIGH: filter = Cairo.CAIRO_FILTER_BEST; break;
}
long pattern = Cairo.cairo_pattern_create_for_surface(srcImage.surface);
if (pattern == 0) SWT.error(SWT.ERROR_NO_HANDLES);
if (srcWidth != destWidth || srcHeight != destHeight) {
Cairo.cairo_pattern_set_extend(pattern, Cairo.CAIRO_EXTEND_PAD);
}
Cairo.cairo_pattern_set_filter(pattern, filter);
Cairo.cairo_set_source(cairo, pattern);
if (data.alpha != 0xFF) {
Cairo.cairo_paint_with_alpha(cairo, data.alpha / (float)0xFF);
} else {
Cairo.cairo_paint(cairo);
}
Cairo.cairo_restore(cairo);
Cairo.cairo_pattern_destroy(pattern);
}
}
/**
* Draws a line, using the foreground color, between the points
* (x1, y1) and (x2, y2).
*
* @param x1 the first point's x coordinate
* @param y1 the first point's y coordinate
* @param x2 the second point's x coordinate
* @param y2 the second point's y coordinate
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void drawLine(int x1, int y1, int x2, int y2) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
Point loc1 = DPIUtil.autoScaleUp(drawable, new Point(x1, y1));
Point loc2 = DPIUtil.autoScaleUp(drawable, new Point(x2, y2));
drawLineInPixels(loc1.x, loc1.y, loc2.x, loc2.y);
}
void drawLineInPixels(int x1, int y1, int x2, int y2) {
checkGC(DRAW);
long cairo = data.cairo;
double xOffset = data.cairoXoffset, yOffset = data.cairoYoffset;
if (Cairo.cairo_version() >= Cairo.CAIRO_VERSION_ENCODE(1, 12, 0)) {
Cairo.cairo_set_antialias(cairo, Cairo.CAIRO_ANTIALIAS_BEST);
}
Cairo.cairo_move_to(cairo, x1 + xOffset, y1 + yOffset);
Cairo.cairo_line_to(cairo, x2 + xOffset, y2 + yOffset);
Cairo.cairo_stroke(cairo);
}
/**
* Draws the outline of an oval, using the foreground color,
* within the specified rectangular area.
*
* The result is a circle or ellipse that fits within the
* rectangle specified by the x, y,
* width, and height arguments.
*
* The oval covers an area that is width + 1
* points wide and height + 1 points tall.
*
*
* @param x the x coordinate of the upper left corner of the oval to be drawn
* @param y the y coordinate of the upper left corner of the oval to be drawn
* @param width the width of the oval to be drawn
* @param height the height of the oval to be drawn
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void drawOval(int x, int y, int width, int height) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
Rectangle rect = DPIUtil.autoScaleUp(drawable, new Rectangle(x, y, width, height));
drawOvalInPixels(rect.x, rect.y, rect.width, rect.height);
}
void drawOvalInPixels(int x, int y, int width, int height) {
checkGC(DRAW);
if (width < 0) {
x = x + width;
width = -width;
}
if (height < 0) {
y = y + height;
height = -height;
}
long cairo = data.cairo;
double xOffset = data.cairoXoffset, yOffset = data.cairoYoffset;
if (width == height) {
Cairo.cairo_arc_negative(cairo, x + xOffset + width / 2f, y + yOffset + height / 2f, width / 2f, 0, -2 * (float)Math.PI);
} else {
Cairo.cairo_save(cairo);
Cairo.cairo_translate(cairo, x + xOffset + width / 2f, y + yOffset + height / 2f);
Cairo.cairo_scale(cairo, width / 2f, height / 2f);
Cairo.cairo_arc_negative(cairo, 0, 0, 1, 0, -2 * (float)Math.PI);
Cairo.cairo_restore(cairo);
}
Cairo.cairo_stroke(cairo);
}
/**
* Draws the path described by the parameter.
*
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
*
*
* @param path the path to draw
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the parameter is null
*
ERROR_INVALID_ARGUMENT - if the parameter has been disposed
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available
*
*
* @see Path
*
* @since 3.1
*/
public void drawPath(Path path) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (path == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (path.handle == 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
initCairo();
checkGC(DRAW);
long cairo = data.cairo;
Cairo.cairo_save(cairo);
double xOffset = data.cairoXoffset, yOffset = data.cairoYoffset;
Cairo.cairo_translate(cairo, xOffset, yOffset);
long copy = Cairo.cairo_copy_path(path.handle);
if (copy == 0) SWT.error(SWT.ERROR_NO_HANDLES);
Cairo.cairo_append_path(cairo, copy);
Cairo.cairo_path_destroy(copy);
Cairo.cairo_stroke(cairo);
Cairo.cairo_restore(cairo);
}
/**
* Draws an SWT logical point, using the foreground color, at the specified
* point (x, y).
*
* Note that the receiver's line attributes do not affect this
* operation.
*
*
* @param x the point's x coordinate
* @param y the point's y coordinate
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @since 3.0
*/
public void drawPoint (int x, int y) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
Point loc = DPIUtil.autoScaleUp(drawable, new Point(x, y));
drawPointInPixels(loc.x, loc.y);
}
void drawPointInPixels (int x, int y) {
checkGC(DRAW);
long cairo = data.cairo;
Cairo.cairo_rectangle(cairo, x, y, 1, 1);
Cairo.cairo_fill(cairo);
}
/**
* Draws the closed polygon which is defined by the specified array
* of integer coordinates, using the receiver's foreground color. The array
* contains alternating x and y values which are considered to represent
* points which are the vertices of the polygon. Lines are drawn between
* each consecutive pair, and between the first pair and last pair in the
* array.
*
* @param pointArray an array of alternating x and y values which are the vertices of the polygon
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT if pointArray is null
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void drawPolygon(int[] pointArray) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (pointArray == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
int [] scaledPointArray = DPIUtil.autoScaleUp(drawable, pointArray);
drawPolygonInPixels(scaledPointArray);
}
void drawPolygonInPixels(int[] pointArray) {
checkGC(DRAW);
long cairo = data.cairo;
drawPolyline(cairo, pointArray, true);
Cairo.cairo_stroke(cairo);
}
/**
* Draws the polyline which is defined by the specified array
* of integer coordinates, using the receiver's foreground color. The array
* contains alternating x and y values which are considered to represent
* points which are the corners of the polyline. Lines are drawn between
* each consecutive pair, but not between the first pair and last pair in
* the array.
*
* @param pointArray an array of alternating x and y values which are the corners of the polyline
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the point array is null
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void drawPolyline(int[] pointArray) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (pointArray == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
int [] scaledPointArray = DPIUtil.autoScaleUp(drawable, pointArray);
drawPolylineInPixels(scaledPointArray);
}
void drawPolylineInPixels(int[] pointArray) {
checkGC(DRAW);
long cairo = data.cairo;
drawPolyline(cairo, pointArray, false);
Cairo.cairo_stroke(cairo);
}
void drawPolyline(long cairo, int[] pointArray, boolean close) {
int count = pointArray.length / 2;
if (count == 0) return;
double xOffset = data.cairoXoffset, yOffset = data.cairoYoffset;
Cairo.cairo_move_to(cairo, pointArray[0] + xOffset, pointArray[1] + yOffset);
for (int i = 1, j=2; i < count; i++, j += 2) {
Cairo.cairo_line_to(cairo, pointArray[j] + xOffset, pointArray[j + 1] + yOffset);
}
if (close) Cairo.cairo_close_path(cairo);
}
/**
* Draws the outline of the rectangle specified by the arguments,
* using the receiver's foreground color. The left and right edges
* of the rectangle are at x and x + width.
* The top and bottom edges are at y and y + height.
*
* @param x the x coordinate of the rectangle to be drawn
* @param y the y coordinate of the rectangle to be drawn
* @param width the width of the rectangle to be drawn
* @param height the height of the rectangle to be drawn
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void drawRectangle(int x, int y, int width, int height) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
drawRectangle(new Rectangle(x, y, width, height));
}
void drawRectangleInPixels(int x, int y, int width, int height) {
checkGC(DRAW);
if (width < 0) {
x = x + width;
width = -width;
}
if (height < 0) {
y = y + height;
height = -height;
}
long cairo = data.cairo;
double xOffset = data.cairoXoffset, yOffset = data.cairoYoffset;
Cairo.cairo_rectangle(cairo, x + xOffset, y + yOffset, width, height);
Cairo.cairo_stroke(cairo);
}
/**
* Draws the outline of the specified rectangle, using the receiver's
* foreground color. The left and right edges of the rectangle are at
* rect.x and rect.x + rect.width. The top
* and bottom edges are at rect.y and
* rect.y + rect.height.
*
* @param rect the rectangle to draw
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the rectangle is null
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void drawRectangle(Rectangle rect) {
if (rect == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
drawRectangleInPixels(DPIUtil.autoScaleUp(drawable, rect));
}
void drawRectangleInPixels(Rectangle rect) {
drawRectangleInPixels (rect.x, rect.y, rect.width, rect.height);
}
/**
* Draws the outline of the round-cornered rectangle specified by
* the arguments, using the receiver's foreground color. The left and
* right edges of the rectangle are at x and x + width.
* The top and bottom edges are at y and y + height.
* The roundness of the corners is specified by the
* arcWidth and arcHeight arguments, which
* are respectively the width and height of the ellipse used to draw
* the corners.
*
* @param x the x coordinate of the rectangle to be drawn
* @param y the y coordinate of the rectangle to be drawn
* @param width the width of the rectangle to be drawn
* @param height the height of the rectangle to be drawn
* @param arcWidth the width of the arc
* @param arcHeight the height of the arc
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void drawRoundRectangle(int x, int y, int width, int height, int arcWidth, int arcHeight) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
Rectangle rect = DPIUtil.autoScaleUp(drawable, new Rectangle(x, y, width, height));
Point arcSize = DPIUtil.autoScaleUp(drawable, new Point(arcWidth, arcHeight));
drawRoundRectangleInPixels(rect.x, rect.y, rect.width, rect.height, arcSize.x, arcSize.y);
}
void drawRoundRectangleInPixels(int x, int y, int width, int height, int arcWidth, int arcHeight) {
checkGC(DRAW);
int nx = x;
int ny = y;
int nw = width;
int nh = height;
int naw = arcWidth;
int nah = arcHeight;
if (nw < 0) {
nw = 0 - nw;
nx = nx - nw;
}
if (nh < 0) {
nh = 0 - nh;
ny = ny -nh;
}
if (naw < 0) naw = 0 - naw;
if (nah < 0) nah = 0 - nah;
long cairo = data.cairo;
double xOffset = data.cairoXoffset, yOffset = data.cairoYoffset;
if (naw == 0 || nah == 0) {
Cairo.cairo_rectangle(cairo, x + xOffset, y + yOffset, width, height);
} else {
float naw2 = naw / 2f;
float nah2 = nah / 2f;
float fw = nw / naw2;
float fh = nh / nah2;
Cairo.cairo_save(cairo);
Cairo.cairo_translate(cairo, nx + xOffset, ny + yOffset);
Cairo.cairo_scale(cairo, naw2, nah2);
Cairo.cairo_move_to(cairo, fw - 1, 0);
Cairo.cairo_arc(cairo, fw - 1, 1, 1, Math.PI + Math.PI/2.0, Math.PI*2.0);
Cairo.cairo_arc(cairo, fw - 1, fh - 1, 1, 0, Math.PI/2.0);
Cairo.cairo_arc(cairo, 1, fh - 1, 1, Math.PI/2, Math.PI);
Cairo.cairo_arc(cairo, 1, 1, 1, Math.PI, 270.0*Math.PI/180.0);
Cairo.cairo_close_path(cairo);
Cairo.cairo_restore(cairo);
}
Cairo.cairo_stroke(cairo);
}
/**
* Draws the given string, using the receiver's current font and
* foreground color. No tab expansion or carriage return processing
* will be performed. The background of the rectangular area where
* the string is being drawn will be filled with the receiver's
* background color.
*
* On Windows, {@link #drawString} and {@link #drawText} are slightly
* different, see {@link #drawString(String, int, int, boolean)} for
* explanation.
*
* @param string the string to be drawn
* @param x the x coordinate of the top left corner of the rectangular area where the string is to be drawn
* @param y the y coordinate of the top left corner of the rectangular area where the string is to be drawn
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the string is null
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void drawString (String string, int x, int y) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (string == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
drawString (string, x, y, false);
}
void drawStringInPixels (String string, int x, int y) {
drawStringInPixels(string, x, y, false);
}
/**
* Draws the given string, using the receiver's current font and
* foreground color. No tab expansion or carriage return processing
* will be performed. If isTransparent is true,
* then the background of the rectangular area where the string is being
* drawn will not be modified, otherwise it will be filled with the
* receiver's background color.
*
* On Windows, {@link #drawString} and {@link #drawText} are slightly
* different:
*
*
{@link #drawString} is faster (depends on string size) ~7x for 1-char strings ~4x for 10-char strings ~2x for 100-char strings
*
{@link #drawString} doesn't try to find a good fallback font when character doesn't have a glyph in currently selected font
*
*
* @param string the string to be drawn
* @param x the x coordinate of the top left corner of the rectangular area where the string is to be drawn
* @param y the y coordinate of the top left corner of the rectangular area where the string is to be drawn
* @param isTransparent if true the background will be transparent, otherwise it will be opaque
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the string is null
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void drawString(String string, int x, int y, boolean isTransparent) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (string == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
Point loc = DPIUtil.autoScaleUp(drawable, new Point(x, y));
drawStringInPixels(string, loc.x, loc.y, isTransparent);
}
void drawStringInPixels(String string, int x, int y, boolean isTransparent) {
drawTextInPixels(string, x, y, isTransparent ? SWT.DRAW_TRANSPARENT : 0);
}
/**
* Draws the given string, using the receiver's current font and
* foreground color. Tab expansion and carriage return processing
* are performed. The background of the rectangular area where
* the text is being drawn will be filled with the receiver's
* background color.
*
* On Windows, {@link #drawString} and {@link #drawText} are slightly
* different, see {@link #drawString(String, int, int, boolean)} for
* explanation.
*
* @param string the string to be drawn
* @param x the x coordinate of the top left corner of the rectangular area where the text is to be drawn
* @param y the y coordinate of the top left corner of the rectangular area where the text is to be drawn
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the string is null
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void drawText(String string, int x, int y) {
drawText(string, x, y, SWT.DRAW_DELIMITER | SWT.DRAW_TAB);
}
void drawTextInPixels(String string, int x, int y) {
drawTextInPixels(string, x, y, SWT.DRAW_DELIMITER | SWT.DRAW_TAB);
}
/**
* Draws the given string, using the receiver's current font and
* foreground color. Tab expansion and carriage return processing
* are performed. If isTransparent is true,
* then the background of the rectangular area where the text is being
* drawn will not be modified, otherwise it will be filled with the
* receiver's background color.
*
* On Windows, {@link #drawString} and {@link #drawText} are slightly
* different, see {@link #drawString(String, int, int, boolean)} for
* explanation.
*
* @param string the string to be drawn
* @param x the x coordinate of the top left corner of the rectangular area where the text is to be drawn
* @param y the y coordinate of the top left corner of the rectangular area where the text is to be drawn
* @param isTransparent if true the background will be transparent, otherwise it will be opaque
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the string is null
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void drawText(String string, int x, int y, boolean isTransparent) {
Point loc = DPIUtil.autoScaleUp(drawable, new Point (x, y));
drawTextInPixels(string, loc.x, loc.y, isTransparent);
}
void drawTextInPixels(String string, int x, int y, boolean isTransparent) {
int flags = SWT.DRAW_DELIMITER | SWT.DRAW_TAB;
if (isTransparent) flags |= SWT.DRAW_TRANSPARENT;
drawTextInPixels(string, x, y, flags);
}
/**
* Draws the given string, using the receiver's current font and
* foreground color. Tab expansion, line delimiter and mnemonic
* processing are performed according to the specified flags. If
* flags includes DRAW_TRANSPARENT,
* then the background of the rectangular area where the text is being
* drawn will not be modified, otherwise it will be filled with the
* receiver's background color.
*
* On Windows, {@link #drawString} and {@link #drawText} are slightly
* different, see {@link #drawString(String, int, int, boolean)} for
* explanation.
*
*
* The parameter flags may be a combination of:
*
*
*
DRAW_DELIMITER
*
draw multiple lines
*
DRAW_TAB
*
expand tabs
*
DRAW_MNEMONIC
*
underline the mnemonic character
*
DRAW_TRANSPARENT
*
transparent background
*
*
* @param string the string to be drawn
* @param x the x coordinate of the top left corner of the rectangular area where the text is to be drawn
* @param y the y coordinate of the top left corner of the rectangular area where the text is to be drawn
* @param flags the flags specifying how to process the text
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the string is null
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void drawText (String string, int x, int y, int flags) {
Point loc = DPIUtil.autoScaleUp(drawable, new Point (x, y));
drawTextInPixels(string, loc.x, loc.y, flags);
}
void drawTextInPixels (String string, int x, int y, int flags) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (string == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (string.length() == 0) return;
long cairo = data.cairo;
setString(string, flags);
checkGC(FONT);
if ((flags & SWT.DRAW_TRANSPARENT) == 0) {
checkGC(BACKGROUND);
if (data.stringWidth == -1) {
computeStringSize();
}
Cairo.cairo_rectangle(cairo, x, y, data.stringWidth, data.stringHeight);
Cairo.cairo_fill(cairo);
}
checkGC(FOREGROUND);
if ((data.style & SWT.MIRRORED) != 0) {
Cairo.cairo_save(cairo);
if (data.stringWidth == -1) {
computeStringSize();
}
Cairo.cairo_scale(cairo, -1f, 1);
Cairo.cairo_translate(cairo, -2 * x - data.stringWidth, 0);
}
Cairo.cairo_move_to(cairo, x, y);
OS.pango_cairo_show_layout(cairo, data.layout);
if ((data.style & SWT.MIRRORED) != 0) {
Cairo.cairo_restore(cairo);
}
Cairo.cairo_new_path(cairo);
}
/**
* Compares the argument to the receiver, and returns true
* if they represent the same object using a class
* specific comparison.
*
* @param object the object to compare with this object
* @return true if the object is the same as this object and false otherwise
*
* @see #hashCode
*/
@Override
public boolean equals(Object object) {
if (object == this) return true;
if (!(object instanceof GC)) return false;
return handle == ((GC)object).handle;
}
/**
* Fills the interior of a circular or elliptical arc within
* the specified rectangular area, with the receiver's background
* color.
*
* The resulting arc begins at startAngle and extends
* for arcAngle degrees, using the current color.
* Angles are interpreted such that 0 degrees is at the 3 o'clock
* position. A positive value indicates a counter-clockwise rotation
* while a negative value indicates a clockwise rotation.
*
* The center of the arc is the center of the rectangle whose origin
* is (x, y) and whose size is specified by the
* width and height arguments.
*
* The resulting arc covers an area width + 1 points wide
* by height + 1 points tall.
*
*
* @param x the x coordinate of the upper-left corner of the arc to be filled
* @param y the y coordinate of the upper-left corner of the arc to be filled
* @param width the width of the arc to be filled
* @param height the height of the arc to be filled
* @param startAngle the beginning angle
* @param arcAngle the angular extent of the arc, relative to the start angle
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see #drawArc
*/
public void fillArc(int x, int y, int width, int height, int startAngle, int arcAngle) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
Rectangle rect = DPIUtil.autoScaleUp(drawable, new Rectangle(x, y, width, height));
fillArcInPixels(rect.x, rect.y, rect.width, rect.height, startAngle, arcAngle);
}
void fillArcInPixels(int x, int y, int width, int height, int startAngle, int arcAngle) {
checkGC(FILL);
if (width < 0) {
x = x + width;
width = -width;
}
if (height < 0) {
y = y + height;
height = -height;
}
if (width == 0 || height == 0 || arcAngle == 0) return;
long cairo = data.cairo;
if (width == height) {
if (arcAngle >= 0) {
Cairo.cairo_arc_negative(cairo, x + width / 2f, y + height / 2f, width / 2f, -startAngle * (float)Math.PI / 180, -(startAngle + arcAngle) * (float)Math.PI / 180);
} else {
Cairo.cairo_arc(cairo, x + width / 2f, y + height / 2f, width / 2f, -startAngle * (float)Math.PI / 180, -(startAngle + arcAngle) * (float)Math.PI / 180);
}
Cairo.cairo_line_to(cairo, x + width / 2f, y + height / 2f);
} else {
Cairo.cairo_save(cairo);
Cairo.cairo_translate(cairo, x + width / 2f, y + height / 2f);
Cairo.cairo_scale(cairo, width / 2f, height / 2f);
if (arcAngle >= 0) {
Cairo.cairo_arc_negative(cairo, 0, 0, 1, -startAngle * (float)Math.PI / 180, -(startAngle + arcAngle) * (float)Math.PI / 180);
} else {
Cairo.cairo_arc(cairo, 0, 0, 1, -startAngle * (float)Math.PI / 180, -(startAngle + arcAngle) * (float)Math.PI / 180);
}
Cairo.cairo_line_to(cairo, 0, 0);
Cairo.cairo_restore(cairo);
}
Cairo.cairo_fill(cairo);
}
/**
* Fills the interior of the specified rectangle with a gradient
* sweeping from left to right or top to bottom progressing
* from the receiver's foreground color to its background color.
*
* @param x the x coordinate of the rectangle to be filled
* @param y the y coordinate of the rectangle to be filled
* @param width the width of the rectangle to be filled, may be negative
* (inverts direction of gradient if horizontal)
* @param height the height of the rectangle to be filled, may be negative
* (inverts direction of gradient if vertical)
* @param vertical if true sweeps from top to bottom, else
* sweeps from left to right
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see #drawRectangle(int, int, int, int)
*/
public void fillGradientRectangle(int x, int y, int width, int height, boolean vertical) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
Rectangle rect = DPIUtil.autoScaleUp(drawable, new Rectangle(x, y, width, height));
fillGradientRectangleInPixels(rect.x, rect.y, rect.width, rect.height, vertical);
}
void fillGradientRectangleInPixels(int x, int y, int width, int height, boolean vertical) {
if ((width == 0) || (height == 0)) return;
/* Rewrite this to use GdkPixbuf */
RGB backgroundRGB, foregroundRGB;
backgroundRGB = getBackground().getRGB();
foregroundRGB = getForeground().getRGB();
RGB fromRGB, toRGB;
fromRGB = foregroundRGB;
toRGB = backgroundRGB;
boolean swapColors = false;
if (width < 0) {
x += width; width = -width;
if (! vertical) swapColors = true;
}
if (height < 0) {
y += height; height = -height;
if (vertical) swapColors = true;
}
if (swapColors) {
fromRGB = backgroundRGB;
toRGB = foregroundRGB;
}
long cairo = data.cairo;
long pattern;
if (DPIUtil.useCairoAutoScale() ) {
/*
* Here the co-ordinates passed are in points for GTK3.
* That means the user is expecting surface to be at
* device scale equal to current scale factor. So need
* to set the device scale to current scale factor
*/
long surface = Cairo.cairo_get_target(cairo);
if (surface != 0) {
float scaleFactor = DPIUtil.getDeviceZoom() / 100f;
Cairo.cairo_surface_set_device_scale(surface, scaleFactor, scaleFactor);
}
}
if (fromRGB.equals(toRGB)) {
fillRectangleInPixels(x, y, width, height);
return;
}
if (vertical) {
pattern = Cairo.cairo_pattern_create_linear (0.0, 0.0, 0.0, 1.0);
} else {
pattern = Cairo.cairo_pattern_create_linear (0.0, 0.0, 1.0, 0.0);
}
Cairo.cairo_pattern_add_color_stop_rgba (pattern, 0, fromRGB.red / 255f, fromRGB.green / 255f, fromRGB.blue / 255f, data.alpha / 255f);
Cairo.cairo_pattern_add_color_stop_rgba (pattern, 1, toRGB.red / 255f, toRGB.green / 255f, toRGB.blue / 255f, data.alpha / 255f);
Cairo.cairo_save(cairo);
Cairo.cairo_translate(cairo, x, y);
Cairo.cairo_scale(cairo, width, height);
Cairo.cairo_rectangle(cairo, 0, 0, 1, 1);
Cairo.cairo_set_source(cairo, pattern);
Cairo.cairo_fill(cairo);
Cairo.cairo_restore(cairo);
Cairo.cairo_pattern_destroy(pattern);
}
/**
* Fills the interior of an oval, within the specified
* rectangular area, with the receiver's background
* color.
*
* @param x the x coordinate of the upper left corner of the oval to be filled
* @param y the y coordinate of the upper left corner of the oval to be filled
* @param width the width of the oval to be filled
* @param height the height of the oval to be filled
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see #drawOval
*/
public void fillOval(int x, int y, int width, int height) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
Rectangle rect = DPIUtil.autoScaleUp(drawable, new Rectangle(x, y, width, height));
fillOvalInPixels(rect.x, rect.y, rect.width, rect.height);
}
void fillOvalInPixels(int x, int y, int width, int height) {
checkGC(FILL);
if (width < 0) {
x = x + width;
width = -width;
}
if (height < 0) {
y = y + height;
height = -height;
}
long cairo = data.cairo;
if (width == height) {
Cairo.cairo_arc_negative(cairo, x + width / 2f, y + height / 2f, width / 2f, 0, 2 * (float)Math.PI);
} else {
Cairo.cairo_save(cairo);
Cairo.cairo_translate(cairo, x + width / 2f, y + height / 2f);
Cairo.cairo_scale(cairo, width / 2f, height / 2f);
Cairo.cairo_arc_negative(cairo, 0, 0, 1, 0, 2 * (float)Math.PI);
Cairo.cairo_restore(cairo);
}
Cairo.cairo_fill(cairo);
}
/**
* Fills the path described by the parameter.
*
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
*
*
* @param path the path to fill
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the parameter is null
*
ERROR_INVALID_ARGUMENT - if the parameter has been disposed
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available
*
*
* @see Path
*
* @since 3.1
*/
public void fillPath (Path path) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (path == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (path.handle == 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
initCairo();
checkGC(FILL);
long cairo = data.cairo;
long copy = Cairo.cairo_copy_path(path.handle);
if (copy == 0) SWT.error(SWT.ERROR_NO_HANDLES);
Cairo.cairo_append_path(cairo, copy);
Cairo.cairo_path_destroy(copy);
Cairo.cairo_fill(cairo);
}
/**
* Fills the interior of the closed polygon which is defined by the
* specified array of integer coordinates, using the receiver's
* background color. The array contains alternating x and y values
* which are considered to represent points which are the vertices of
* the polygon. Lines are drawn between each consecutive pair, and
* between the first pair and last pair in the array.
*
* @param pointArray an array of alternating x and y values which are the vertices of the polygon
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT if pointArray is null
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see #drawPolygon
*/
public void fillPolygon(int[] pointArray) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (pointArray == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
int [] scaledPointArray = DPIUtil.autoScaleUp(drawable, pointArray);
fillPolygonInPixels(scaledPointArray);
}
void fillPolygonInPixels(int[] pointArray) {
checkGC(FILL);
long cairo = data.cairo;
drawPolyline(cairo, pointArray, true);
Cairo.cairo_fill(cairo);
}
/**
* Fills the interior of the rectangle specified by the arguments,
* using the receiver's background color.
*
* @param x the x coordinate of the rectangle to be filled
* @param y the y coordinate of the rectangle to be filled
* @param width the width of the rectangle to be filled
* @param height the height of the rectangle to be filled
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see #drawRectangle(int, int, int, int)
*/
public void fillRectangle(int x, int y, int width, int height) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
fillRectangle(new Rectangle(x, y, width, height));
}
void fillRectangleInPixels(int x, int y, int width, int height) {
checkGC(FILL);
if (width < 0) {
x = x + width;
width = -width;
}
if (height < 0) {
y = y + height;
height = -height;
}
long cairo = data.cairo;
if (data.regionSet != 0) {
cairoClipRegion(cairo);
} else {
Cairo.cairo_rectangle(cairo, x, y, width, height);
}
Cairo.cairo_fill(cairo);
}
/**
* Fills the interior of the specified rectangle, using the receiver's
* background color.
*
* @param rect the rectangle to be filled
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the rectangle is null
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see #drawRectangle(int, int, int, int)
*/
public void fillRectangle(Rectangle rect) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (rect == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
fillRectangleInPixels(DPIUtil.autoScaleUp(drawable, rect));
}
void fillRectangleInPixels(Rectangle rect) {
fillRectangleInPixels(rect.x, rect.y, rect.width, rect.height);
}
/**
* Fills the interior of the round-cornered rectangle specified by
* the arguments, using the receiver's background color.
*
* @param x the x coordinate of the rectangle to be filled
* @param y the y coordinate of the rectangle to be filled
* @param width the width of the rectangle to be filled
* @param height the height of the rectangle to be filled
* @param arcWidth the width of the arc
* @param arcHeight the height of the arc
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see #drawRoundRectangle
*/
public void fillRoundRectangle(int x, int y, int width, int height, int arcWidth, int arcHeight) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
Rectangle rect = DPIUtil.autoScaleUp(drawable, new Rectangle(x, y, width, height));
Point arcSize = DPIUtil.autoScaleUp(drawable, new Point(arcWidth, arcHeight));
fillRoundRectangleInPixels(rect.x, rect.y, rect.width, rect.height, arcSize.x, arcSize.y);
}
void fillRoundRectangleInPixels(int x, int y, int width, int height, int arcWidth, int arcHeight) {
checkGC(FILL);
int nx = x;
int ny = y;
int nw = width;
int nh = height;
int naw = arcWidth;
int nah = arcHeight;
if (nw < 0) {
nw = 0 - nw;
nx = nx - nw;
}
if (nh < 0) {
nh = 0 - nh;
ny = ny -nh;
}
if (naw < 0) naw = 0 - naw;
if (nah < 0) nah = 0 - nah;
long cairo = data.cairo;
if (naw == 0 || nah == 0) {
Cairo.cairo_rectangle(cairo, x, y, width, height);
} else {
float naw2 = naw / 2f;
float nah2 = nah / 2f;
float fw = nw / naw2;
float fh = nh / nah2;
Cairo.cairo_save(cairo);
Cairo.cairo_translate(cairo, nx, ny);
Cairo.cairo_scale(cairo, naw2, nah2);
Cairo.cairo_move_to(cairo, fw - 1, 0);
Cairo.cairo_arc(cairo, fw - 1, 1, 1, Math.PI + Math.PI/2.0, Math.PI*2.0);
Cairo.cairo_arc(cairo, fw - 1, fh - 1, 1, 0, Math.PI/2.0);
Cairo.cairo_arc(cairo, 1, fh - 1, 1, Math.PI/2, Math.PI);
Cairo.cairo_arc(cairo, 1, 1, 1, Math.PI, 270.0*Math.PI/180.0);
Cairo.cairo_close_path(cairo);
Cairo.cairo_restore(cairo);
}
Cairo.cairo_fill(cairo);
}
int fixMnemonic (char [] buffer) {
int i=0, j=0;
int mnemonic=-1;
while (i < buffer.length) {
if ((buffer [j++] = buffer [i++]) == '&') {
if (i == buffer.length) {continue;}
if (buffer [i] == '&') {i++; continue;}
if (mnemonic == -1) mnemonic = j;
j--;
}
}
while (j < buffer.length) buffer [j++] = 0;
return mnemonic;
}
/**
* Returns the advance width of the specified character in
* the font which is currently selected into the receiver.
*
* The advance width is defined as the horizontal distance the cursor
* should move after printing the character in the selected font.
*
*
* @param ch the character to measure
* @return the distance in the x direction to move past the character before painting the next
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public int getAdvanceWidth(char ch) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
//BOGUS
return stringExtentInPixels(new String(new char[]{ch})).x;
}
/**
* Returns true if receiver is using the operating system's
* advanced graphics subsystem. Otherwise, false is returned
* to indicate that normal graphics are in use.
*
* Advanced graphics may not be installed for the operating system. In this
* case, false is always returned. Some operating system have
* only one graphics subsystem. If this subsystem supports advanced graphics,
* then true is always returned. If any graphics operation such
* as alpha, antialias, patterns, interpolation, paths, clipping or transformation
* has caused the receiver to switch from regular to advanced graphics mode,
* true is returned. If the receiver has been explicitly switched
* to advanced mode and this mode is supported, true is returned.
*
*
* @return the advanced value
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see #setAdvanced
*
* @since 3.1
*/
public boolean getAdvanced() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.cairo != 0;
}
/**
* Returns the receiver's alpha value. The alpha value
* is between 0 (transparent) and 255 (opaque).
*
* @return the alpha value
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @since 3.1
*/
public int getAlpha() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.alpha;
}
/**
* Returns the receiver's anti-aliasing setting value, which will be
* one of SWT.DEFAULT, SWT.OFF or
* SWT.ON. Note that this controls anti-aliasing for all
* non-text drawing operations.
*
* @return the anti-aliasing setting
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see #getTextAntialias
*
* @since 3.1
*/
public int getAntialias() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (data.cairo == 0) return SWT.DEFAULT;
int antialias = Cairo.cairo_get_antialias(data.cairo);
switch (antialias) {
case Cairo.CAIRO_ANTIALIAS_DEFAULT: return SWT.DEFAULT;
case Cairo.CAIRO_ANTIALIAS_NONE: return SWT.OFF;
case Cairo.CAIRO_ANTIALIAS_GRAY:
case Cairo.CAIRO_ANTIALIAS_SUBPIXEL: return SWT.ON;
}
return SWT.DEFAULT;
}
/**
* Returns the background color.
*
* @return the receiver's background color
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public Color getBackground() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return Color.gtk_new(data.device, data.backgroundRGBA);
}
/**
* Returns the background pattern. The default value is
* null.
*
* @return the receiver's background pattern
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see Pattern
*
* @since 3.1
*/
public Pattern getBackgroundPattern() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.backgroundPattern;
}
/**
* Returns the width of the specified character in the font
* selected into the receiver.
*
* The width is defined as the space taken up by the actual
* character, not including the leading and tailing whitespace
* or overhang.
*
*
* @param ch the character to measure
* @return the width of the character
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public int getCharWidth(char ch) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
//BOGUS
return stringExtentInPixels(new String(new char[]{ch})).x;
}
/**
* Returns the bounding rectangle of the receiver's clipping
* region. If no clipping region is set, the return value
* will be a rectangle which covers the entire bounds of the
* object the receiver is drawing on.
*
* @return the bounding rectangle of the clipping region
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public Rectangle getClipping() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return DPIUtil.autoScaleDown(drawable, getClippingInPixels());
}
Rectangle getClippingInPixels() {
/* Calculate visible bounds in device space */
int x = 0, y = 0, width = 0, height = 0;
int[] w = new int[1], h = new int[1];
getSize(w, h);
width = w[0];
height = h[0];
/* Intersect visible bounds with clipping in device space and then convert then to user space */
long cairo = data.cairo;
long clipRgn = data.clipRgn;
long damageRgn = data.damageRgn;
if (clipRgn != 0 || damageRgn != 0 || cairo != 0) {
long rgn = Cairo.cairo_region_create();
cairo_rectangle_int_t rect = new cairo_rectangle_int_t();
rect.width = width;
rect.height = height;
Cairo.cairo_region_union_rectangle(rgn, rect);
if (damageRgn != 0) {
Cairo.cairo_region_intersect (rgn, damageRgn);
}
/* Intersect visible bounds with clipping */
if (clipRgn != 0) {
/* Convert clipping to device space if needed */
if (!Arrays.equals(data.clippingTransform, currentTransform)) {
double[] clippingTransform;
if (currentTransform != null && data.clippingTransform == null) {
/*
* User actions in this case are:
* 1. Set clipping.
* 2. Set a transformation B.
*
* The clipping was specified before transformation B was set.
* So to convert it to the new space, we just invert the transformation B.
*/
clippingTransform = currentTransform.clone();
Cairo.cairo_matrix_invert(clippingTransform);
} else if (currentTransform != null && data.clippingTransform != null) {
/*
* User actions in this case are:
* 1. Set a transformation A.
* 2. Set clipping.
* 3. Set a different transformation B. This is global and wipes out transformation A.
*
* Since step 3. wipes out transformation A, we must apply A on the clipping rectangle to have
* the correct clipping rectangle after transformation A is wiped.
* Then, we apply the inverted transformation B on the resulting clipping,
* to convert it to the new space (which results after applying B).
*/
clippingTransform = new double[6];
double[] invertedCurrentTransform = currentTransform.clone();
Cairo.cairo_matrix_invert(invertedCurrentTransform);
Cairo.cairo_matrix_multiply(clippingTransform, data.clippingTransform, invertedCurrentTransform);
} else {
/*
* User actions in this case are:
* 1. Set a transformation A.
* 2. Set clipping.
* 3. Wipe the transformation A (i.e. call GC.setTransformation(A)).
*
* We must apply transformation A on the clipping, to convert it to the new space.
*/
clippingTransform = data.clippingTransform.clone();
}
long oldRgn = rgn;
rgn = convertRgn(rgn, clippingTransform);
Cairo.cairo_region_destroy(oldRgn);
clipRgn = convertRgn(clipRgn, clippingTransform);
Cairo.cairo_region_intersect(rgn, clipRgn);
Cairo.cairo_region_destroy(clipRgn);
} else {
Cairo.cairo_region_intersect(rgn, clipRgn);
}
}
Cairo.cairo_region_get_extents(rgn, rect);
Cairo.cairo_region_destroy(rgn);
x = rect.x;
y = rect.y;
width = rect.width;
height = rect.height;
}
return new Rectangle(x, y, width, height);
}
/**
* Sets the region managed by the argument to the current
* clipping region of the receiver.
*
* @param region the region to fill with the clipping region
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the region is null
*
ERROR_INVALID_ARGUMENT - if the region is disposed
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void getClipping(Region region) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (region == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (region.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
long clipping = region.handle;
Cairo.cairo_region_subtract(clipping, clipping);
long clipRgn = data.clipRgn;
if (clipRgn == 0) {
cairo_rectangle_int_t rect = new cairo_rectangle_int_t();
int[] width = new int[1], height = new int[1];
getSize(width, height);
rect.width = width[0];
rect.height = height[0];
Cairo.cairo_region_union_rectangle(clipping, rect);
} else {
Cairo.cairo_region_union(clipping, clipRgn);
}
if (data.damageRgn != 0) {
Cairo.cairo_region_intersect(clipping, data.damageRgn);
}
}
/**
* Returns the receiver's fill rule, which will be one of
* SWT.FILL_EVEN_ODD or SWT.FILL_WINDING.
*
* @return the receiver's fill rule
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @since 3.1
*/
public int getFillRule() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
long cairo = data.cairo;
if (cairo == 0) return SWT.FILL_EVEN_ODD;
return Cairo.cairo_get_fill_rule(cairo) == Cairo.CAIRO_FILL_RULE_WINDING ? SWT.FILL_WINDING : SWT.FILL_EVEN_ODD;
}
/**
* Returns the font currently being used by the receiver
* to draw and measure text.
*
* @return the receiver's font
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public Font getFont() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.font;
}
/**
* Returns a FontMetrics which contains information
* about the font currently being used by the receiver
* to draw and measure text.
*
* @return font metrics for the receiver's font
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public FontMetrics getFontMetrics() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (data.context == 0) createLayout();
checkGC(FONT);
Font font = data.font;
long context = data.context;
long lang = OS.pango_context_get_language(context);
long metrics = OS.pango_context_get_metrics(context, font.handle, lang);
FontMetrics fm = new FontMetrics();
int ascent = OS.pango_font_metrics_get_ascent(metrics);
int descent = OS.pango_font_metrics_get_descent(metrics);
int ascentInPoints = DPIUtil.autoScaleDown(drawable, OS.PANGO_PIXELS(ascent));
fm.ascentInPoints = ascentInPoints;
int heightInPoints = DPIUtil.autoScaleDown(drawable, OS.PANGO_PIXELS(ascent + descent));
fm.descentInPoints = heightInPoints - ascentInPoints;
fm.averageCharWidthInPoints = DPIUtil.autoScaleDown(drawable, OS.PANGO_PIXELS(OS.pango_font_metrics_get_approximate_char_width(metrics)));
OS.pango_font_metrics_unref(metrics);
return fm;
}
/**
* Returns the receiver's foreground color.
*
* @return the color used for drawing foreground things
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public Color getForeground() {
if (handle == 0) SWT.error(SWT.ERROR_WIDGET_DISPOSED);
return Color.gtk_new(data.device, data.foregroundRGBA);
}
/**
* Returns the foreground pattern. The default value is
* null.
*
* @return the receiver's foreground pattern
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see Pattern
*
* @since 3.1
*/
public Pattern getForegroundPattern() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.foregroundPattern;
}
/**
* Returns the GCData.
*
* IMPORTANT: This method is not part of the public
* API for GC. It is marked public only so that it
* can be shared within the packages provided by SWT. It is not
* available on all platforms, and should never be called from
* application code.
*
*
* @return the receiver's GCData
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see GCData
*
* @noreference This method is not intended to be referenced by clients.
*
* @since 3.2
*/
public GCData getGCData() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data;
}
/**
* Returns the receiver's interpolation setting, which will be one of
* SWT.DEFAULT, SWT.NONE,
* SWT.LOW or SWT.HIGH.
*
* @return the receiver's interpolation setting
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @since 3.1
*/
public int getInterpolation() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.interpolation;
}
/**
* Returns the receiver's line attributes.
*
* @return the line attributes used for drawing lines
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @since 3.3
*/
public LineAttributes getLineAttributes() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
LineAttributes attributes = getLineAttributesInPixels();
attributes.width = DPIUtil.autoScaleDown(drawable, attributes.width);
return attributes;
}
LineAttributes getLineAttributesInPixels() {
float[] dashes = null;
if (data.lineDashes != null) {
dashes = new float[data.lineDashes.length];
System.arraycopy(data.lineDashes, 0, dashes, 0, dashes.length);
}
return new LineAttributes(data.lineWidth, data.lineCap, data.lineJoin, data.lineStyle, dashes, data.lineDashesOffset, data.lineMiterLimit);
}
/**
* Returns the receiver's line cap style, which will be one
* of the constants SWT.CAP_FLAT, SWT.CAP_ROUND,
* or SWT.CAP_SQUARE.
*
* @return the cap style used for drawing lines
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @since 3.1
*/
public int getLineCap() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.lineCap;
}
/**
* Returns the receiver's line dash style. The default value is
* null.
*
* @return the line dash style used for drawing lines
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @since 3.1
*/
public int[] getLineDash() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (data.lineDashes == null) return null;
int[] lineDashes = new int[data.lineDashes.length];
for (int i = 0; i < lineDashes.length; i++) {
lineDashes[i] = (int)data.lineDashes[i];
}
return lineDashes;
}
/**
* Returns the receiver's line join style, which will be one
* of the constants SWT.JOIN_MITER, SWT.JOIN_ROUND,
* or SWT.JOIN_BEVEL.
*
* @return the join style used for drawing lines
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @since 3.1
*/
public int getLineJoin() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.lineJoin;
}
/**
* Returns the receiver's line style, which will be one
* of the constants SWT.LINE_SOLID, SWT.LINE_DASH,
* SWT.LINE_DOT, SWT.LINE_DASHDOT or
* SWT.LINE_DASHDOTDOT.
*
* @return the style used for drawing lines
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public int getLineStyle() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.lineStyle;
}
/**
* Returns the width that will be used when drawing lines
* for all of the figure drawing operations (that is,
* drawLine, drawRectangle,
* drawPolyline, and so forth.
*
* @return the receiver's line width
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public int getLineWidth() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return (int)DPIUtil.autoScaleDown(drawable, data.lineWidth);
}
int getLineWidthInPixels() {
return (int)data.lineWidth;
}
/**
* Returns the receiver's style information.
*
* Note that the value which is returned by this method may
* not match the value which was provided to the constructor
* when the receiver was created. This can occur when the underlying
* operating system does not support a particular combination of
* requested styles.
*
*
* @return the style bits
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @since 2.1.2
*/
public int getStyle () {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.style;
}
void getSize(int[] width, int[] height) {
if (data.width != -1 && data.height != -1) {
width[0] = data.width;
height[0] = data.height;
return;
}
if (data.drawable != 0) {
if (GTK.GTK4) {
width[0] = GDK.gdk_surface_get_width(data.drawable);
height[0] = GDK.gdk_surface_get_height(data.drawable);
} else {
width[0] = GDK.gdk_window_get_width(data.drawable);
height[0] = GDK.gdk_window_get_height(data.drawable);
}
return;
}
long surface = Cairo.cairo_get_target(handle);
switch (Cairo.cairo_surface_get_type(surface)) {
case Cairo.CAIRO_SURFACE_TYPE_IMAGE:
width[0] = Cairo.cairo_image_surface_get_width(surface);
height[0] = Cairo.cairo_image_surface_get_height(surface);
break;
case Cairo.CAIRO_SURFACE_TYPE_XLIB:
width[0] = Cairo.cairo_xlib_surface_get_width(surface);
height[0] = Cairo.cairo_xlib_surface_get_height(surface);
break;
}
}
/**
* Returns the receiver's text drawing anti-aliasing setting value,
* which will be one of SWT.DEFAULT, SWT.OFF or
* SWT.ON. Note that this controls anti-aliasing
* only for text drawing operations.
*
* @return the anti-aliasing setting
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see #getAntialias
*
* @since 3.1
*/
public int getTextAntialias() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (data.cairo == 0) return SWT.DEFAULT;
int antialias = Cairo.CAIRO_ANTIALIAS_DEFAULT;
if (data.context != 0) {
long options = OS.pango_cairo_context_get_font_options(data.context);
if (options != 0) antialias = Cairo.cairo_font_options_get_antialias(options);
}
switch (antialias) {
case Cairo.CAIRO_ANTIALIAS_DEFAULT: return SWT.DEFAULT;
case Cairo.CAIRO_ANTIALIAS_NONE: return SWT.OFF;
case Cairo.CAIRO_ANTIALIAS_GRAY:
case Cairo.CAIRO_ANTIALIAS_SUBPIXEL: return SWT.ON;
}
return SWT.DEFAULT;
}
/**
* Sets the parameter to the transform that is currently being
* used by the receiver.
*
* @param transform the destination to copy the transform into
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the parameter is null
*
ERROR_INVALID_ARGUMENT - if the parameter has been disposed
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see Transform
*
* @since 3.1
*/
public void getTransform(Transform transform) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (transform == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (transform.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
long cairo = data.cairo;
if (cairo != 0) {
/*
* The client wants to know the relative transformation they set for their widgets.
* They do not want to know about the global coordinates of their widget, which is contained in Cairo.cairo_get_matrix().
* So we return whatever the client specified with setTransform.
*/
if (currentTransform != null) {
transform.handle = currentTransform.clone();
} else {
transform.handle = new double[] { 1.0, 0.0, 0.0, 1.0, 0.0, 0.0 };
}
} else {
transform.setElements(1, 0, 0, 1, 0, 0);
}
}
/**
* Returns true if this GC is drawing in the mode
* where the resulting color in the destination is the
* exclusive or of the color values in the source
* and the destination, and false if it is
* drawing in the mode where the destination color is being
* replaced with the source color value.
*
* @return true true if the receiver is in XOR mode, and false otherwise
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public boolean getXORMode() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.xorMode;
}
/**
* Returns an integer hash code for the receiver. Any two
* objects that return true when passed to
* equals must return the same value for this
* method.
*
* @return the receiver's hash
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see #equals
*/
@Override
public int hashCode() {
return (int)handle;
}
double[] identity() {
double[] identity = new double[6];
if ((data.style & SWT.MIRRORED) != 0) {
int[] w = new int[1], h = new int[1];
getSize(w, h);
Cairo.cairo_matrix_init(identity, -1, 0, 0, 1, w[0], 0);
} else {
Cairo.cairo_matrix_init_identity(identity);
}
if (data.identity != null) {
Cairo.cairo_matrix_multiply(identity, data.identity, identity);
}
return identity;
}
void init(Drawable drawable, GCData data, long gdkGC) {
if (data.foregroundRGBA != null) data.state &= ~FOREGROUND;
if (data.backgroundRGBA != null) data.state &= ~(BACKGROUND | BACKGROUND_BG);
if (data.font != null) data.state &= ~FONT;
Image image = data.image;
if (image != null) {
image.memGC = this;
/*
* The transparent pixel mask might change when drawing on
* the image. Destroy it so that it is regenerated when
* necessary.
*/
if (image.transparentPixel != -1) image.destroyMask();
}
this.drawable = drawable;
this.data = data;
handle = gdkGC;
long cairo = data.cairo = handle;
Cairo.cairo_set_fill_rule(cairo, Cairo.CAIRO_FILL_RULE_EVEN_ODD);
data.state &= ~(BACKGROUND | FOREGROUND | FONT | LINE_WIDTH | LINE_CAP | LINE_JOIN | LINE_STYLE | DRAW_OFFSET);
setClipping(data.clipRgn);
initCairo();
if ((data.style & SWT.MIRRORED) != 0) {
// Don't overwrite the Cairo transformation matrix in GTK 3.14 and above; it contains a translation relative to the parent widget.
int[] w = new int[1], h = new int[1];
getSize(w, h);
Cairo.cairo_translate(cairo, w[0], 0);
Cairo.cairo_scale(cairo, -1.0, 1.0);
}
if (cairoTransformationMatrix == null) cairoTransformationMatrix = new double[6];
Cairo.cairo_get_matrix(data.cairo, cairoTransformationMatrix);
clipping = getClipping();
}
void initCairo() {
long cairo = data.cairo;
if (cairo != 0) return;
if (GTK.GTK4) {
long surface = Cairo.cairo_image_surface_create(Cairo.CAIRO_FORMAT_A8, data.width, data.height);
data.cairo = cairo = Cairo.cairo_create(surface);
} else {
data.cairo = cairo = Cairo.cairo_create(data.drawable);
}
if (cairo == 0) SWT.error(SWT.ERROR_NO_HANDLES);
data.disposeCairo = true;
Cairo.cairo_set_fill_rule(cairo, Cairo.CAIRO_FILL_RULE_EVEN_ODD);
data.state &= ~(BACKGROUND | FOREGROUND | FONT | LINE_WIDTH | LINE_CAP | LINE_JOIN | LINE_STYLE | DRAW_OFFSET);
setCairoClip(data.damageRgn, data.clipRgn);
}
void computeStringSize() {
int[] width = new int[1], height = new int[1];
OS.pango_layout_get_pixel_size(data.layout, width, height);
data.stringHeight = height[0];
data.stringWidth = width[0];
}
/**
* Returns true if the receiver has a clipping
* region set into it, and false otherwise.
* If this method returns false, the receiver will draw on all
* available space in the destination. If it returns true,
* it will draw only in the area that is covered by the region
* that can be accessed with getClipping(region).
*
* @return true if the GC has a clipping region, and false otherwise
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public boolean isClipped() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.clipRgn != 0;
}
/**
* Returns true if the GC has been disposed,
* and false otherwise.
*
* This method gets the dispose state for the GC.
* When a GC has been disposed, it is an error to
* invoke any other method (except {@link #dispose()}) using the GC.
*
* @return true when the GC is disposed and false otherwise
*/
@Override
public boolean isDisposed() {
return handle == 0;
}
boolean isIdentity(double[] matrix) {
if (matrix == null) return true;
return matrix[0] == 1 && matrix[1] == 0 && matrix[2] == 0 && matrix[3] == 1 && matrix[4] == 0 && matrix[5] == 0;
}
/**
* Sets the receiver to always use the operating system's advanced graphics
* subsystem for all graphics operations if the argument is true.
* If the argument is false, the advanced graphics subsystem is
* no longer used, advanced graphics state is cleared and the normal graphics
* subsystem is used from now on.
*
* Normally, the advanced graphics subsystem is invoked automatically when
* any one of the alpha, antialias, patterns, interpolation, paths, clipping
* or transformation operations in the receiver is requested. When the receiver
* is switched into advanced mode, the advanced graphics subsystem performs both
* advanced and normal graphics operations. Because the two subsystems are
* different, their output may differ. Switching to advanced graphics before
* any graphics operations are performed ensures that the output is consistent.
*
* Advanced graphics may not be installed for the operating system. In this
* case, this operation does nothing. Some operating system have only one
* graphics subsystem, so switching from normal to advanced graphics does
* nothing. However, switching from advanced to normal graphics will always
* clear the advanced graphics state, even for operating systems that have
* only one graphics subsystem.
*
*
* @param advanced the new advanced graphics state
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see #setAlpha
* @see #setAntialias
* @see #setBackgroundPattern
* @see #setClipping(Path)
* @see #setForegroundPattern
* @see #setLineAttributes
* @see #setInterpolation
* @see #setTextAntialias
* @see #setTransform
* @see #getAdvanced
*
* @since 3.1
*/
public void setAdvanced(boolean advanced) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (!advanced) {
setAlpha(0xFF);
setAntialias(SWT.DEFAULT);
setBackgroundPattern(null);
resetClipping();
setForegroundPattern(null);
setInterpolation(SWT.DEFAULT);
setTextAntialias(SWT.DEFAULT);
setTransform(null);
}
}
/**
* Sets the receiver's alpha value which must be
* between 0 (transparent) and 255 (opaque).
*
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
*
* @param alpha the alpha value
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available
*
*
* @see #getAdvanced
* @see #setAdvanced
*
* @since 3.1
*/
public void setAlpha(int alpha) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (data.cairo == 0 && (alpha & 0xff) == 0xff) return;
initCairo();
data.alpha = alpha & 0xff;
data.state &= ~(BACKGROUND | FOREGROUND | BACKGROUND_BG);
}
/**
* Sets the receiver's anti-aliasing value to the parameter,
* which must be one of SWT.DEFAULT, SWT.OFF
* or SWT.ON. Note that this controls anti-aliasing for all
* non-text drawing operations.
*
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
*
ERROR_INVALID_ARGUMENT - if the parameter is not one of SWT.DEFAULT,
* SWT.OFF or SWT.ON
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available
*
*
* @see #getAdvanced
* @see #setAdvanced
* @see #setTextAntialias
*
* @since 3.1
*/
public void setAntialias(int antialias) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (data.cairo == 0 && antialias == SWT.DEFAULT) return;
int mode = 0;
switch (antialias) {
case SWT.DEFAULT: mode = Cairo.CAIRO_ANTIALIAS_DEFAULT; break;
case SWT.OFF: mode = Cairo.CAIRO_ANTIALIAS_NONE; break;
case SWT.ON: mode = Cairo.CAIRO_ANTIALIAS_GRAY;
break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
initCairo();
long cairo = data.cairo;
Cairo.cairo_set_antialias(cairo, mode);
}
/**
* Sets the background color. The background color is used
* for fill operations and as the background color when text
* is drawn.
*
* @param color the new background color for the receiver
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the color is null
*
ERROR_INVALID_ARGUMENT - if the color has been disposed
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void setBackground(Color color) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (color == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (color.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
data.backgroundRGBA = color.handle;
data.backgroundPattern = null;
data.state &= ~(BACKGROUND | BACKGROUND_BG);
}
/**
* Sets the background pattern. The default value is null.
*
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
*
*
* @param pattern the new background pattern
*
* @exception IllegalArgumentException
*
ERROR_INVALID_ARGUMENT - if the parameter has been disposed
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available
*
*
* @see Pattern
* @see #getAdvanced
* @see #setAdvanced
*
* @since 3.1
*/
public void setBackgroundPattern(Pattern pattern) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (pattern != null && pattern.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if (data.cairo == 0 && pattern == null) return;
initCairo();
if (data.backgroundPattern == pattern) return;
data.backgroundPattern = pattern;
data.state &= ~BACKGROUND;
}
static void setCairoFont(long cairo, Font font) {
if (font == null || font.isDisposed()) return;
setCairoFont(cairo, font.handle);
}
static void setCairoFont(long cairo, long font) {
long family = OS.pango_font_description_get_family(font);
int length = C.strlen(family);
byte[] buffer = new byte[length + 1];
C.memmove(buffer, family, length);
//TODO - convert font height from pango to cairo
double height = OS.PANGO_PIXELS(OS.pango_font_description_get_size(font)) * 96 / 72;
int pangoStyle = OS.pango_font_description_get_style(font);
int pangoWeight = OS.pango_font_description_get_weight(font);
int slant = Cairo.CAIRO_FONT_SLANT_NORMAL;
if (pangoStyle == OS.PANGO_STYLE_ITALIC) slant = Cairo.CAIRO_FONT_SLANT_ITALIC;
if (pangoStyle == OS.PANGO_STYLE_OBLIQUE) slant = Cairo.CAIRO_FONT_SLANT_OBLIQUE;
int weight = Cairo.CAIRO_FONT_WEIGHT_NORMAL;
if (pangoWeight == OS.PANGO_WEIGHT_BOLD) weight = Cairo.CAIRO_FONT_WEIGHT_BOLD;
Cairo.cairo_select_font_face(cairo, buffer, slant, weight);
Cairo.cairo_set_font_size(cairo, height);
}
static void setCairoRegion(long cairo, long rgn) {
GDK.gdk_cairo_region(cairo, rgn);
}
static void setCairoPatternColor(long pattern, int offset, Color c, int alpha) {
GdkRGBA rgba = c.handle;
Cairo.cairo_pattern_add_color_stop_rgba(pattern, offset, rgba.red, rgba.green, rgba.blue, alpha / 255f);
}
void setCairoClip(long damageRgn, long clipRgn) {
long cairo = data.cairo;
Cairo.cairo_reset_clip(cairo);
if (damageRgn != 0) {
double[] matrix = new double[6];
Cairo.cairo_get_matrix(cairo, matrix);
double[] identity = new double[6];
Cairo.cairo_matrix_init_identity(identity);
Cairo.cairo_set_matrix(cairo, identity);
setCairoRegion(cairo, damageRgn);
Cairo.cairo_clip(cairo);
Cairo.cairo_set_matrix(cairo, matrix);
}
if (clipRgn != 0) {
long clipRgnCopy = Cairo.cairo_region_create();
Cairo.cairo_region_union(clipRgnCopy, clipRgn);
/*
* Bug 531667: widgets paint over other widgets
*
* The Cairo handle is shared by all widgets, but GC.setClipping allows global clipping changes.
* So we intersect whatever the client sets with the initial GC clipping.
*/
limitClipping(clipRgnCopy);
setCairoRegion(cairo, clipRgnCopy);
Cairo.cairo_clip(cairo);
Cairo.cairo_region_destroy(clipRgnCopy);
}
}
/**
* Intersects given clipping with original clipping of this context, so
* that resulting clip does not allow to paint outside of the GC bounds.
*/
private void limitClipping(long gcClipping) {
Region clippingRegion = new Region();
if (currentTransform != null) {
// we want to apply GC clipping stored in init() as is, so we invert user transformations that may distort it
double[] invertedCurrentTransform = currentTransform.clone();
Cairo.cairo_matrix_invert(invertedCurrentTransform);
int[] clippingWithoutUserTransform = transformRectangle(invertedCurrentTransform, clipping);
/* Bug 540908: limiting clipping is very slow if client uses a transformation
* Check if client transformation has no rotation, then use Region.add(Rectangle) as its much faster than Region.add(int[])
*/
if (hasNoRotation(invertedCurrentTransform)) {
Rectangle rectangle = getTransformedClippingRectangle(clippingWithoutUserTransform);
clippingRegion.add(rectangle);
} else {
clippingRegion.add(clippingWithoutUserTransform);
}
} else {
clippingRegion.add(clipping);
}
Cairo.cairo_region_intersect(gcClipping, clippingRegion.handle);
clippingRegion.dispose();
}
/**
* Transforms rectangle with given matrix
*
* @return transformed rectangle corner coordinates, with x,y order of points.
*/
private static int[] transformRectangle(double[] affineTransformation, Rectangle rectangle) {
Point[] endPoints = {
new Point(rectangle.x , rectangle.y ),
new Point(rectangle.x + rectangle.width, rectangle.y ),
new Point(rectangle.x + rectangle.width, rectangle.y + rectangle.height),
new Point(rectangle.x , rectangle.y + rectangle.height),
};
return transformPoints(affineTransformation, endPoints);
}
/**
* Transforms x,y coordinate pairs with given matrix
*
* @return transformed x,y coordinates.
*/
private static int[] transformPoints(double[] transformation, Point[] points) {
int[] transformedPoints = new int[points.length * 2];
double[] px = new double[1], py = new double[1];
for (int i = 0; i < points.length; ++i) {
px[0] = points[i].x;
py[0] = points[i].y;
Cairo.cairo_matrix_transform_point(transformation, px, py);
transformedPoints[(i * 2) + 0] = (int) Math.round(px[0]);
transformedPoints[(i * 2) + 1] = (int) Math.round(py[0]);
}
return transformedPoints;
}
private static boolean hasNoRotation(double[] matrix) {
/* Indices in the matrix are: (m11 m12 d1)
* 0: m11, 1: m12, 2: m21, 3: m22, 4: d1, 5: d2 (m21 m22 d2)
*/
double m12 = matrix[1];
double m21 = matrix[2];
return m12 == 0.0 && m21 == 0.0;
}
/* input must be ordered the ordered points of a rectangle:
* pointsArray = {x1, y1, x2, y2, x3, y3, x4, y4}
* with lines (x1,y1) to (x2,y2), (x2,y2) to (x3,y3), (x3,y3) to (x4,y4), (x4,y4) to (x1,y1)
* the lines must be parallel or orthogonal to the x resp. y axis
*/
private static Rectangle getTransformedClippingRectangle(int[] pointsArray) {
int x1 = pointsArray[0];
int y1 = pointsArray[1];
int x2 = pointsArray[2];
int y2 = pointsArray[3];
int x3 = pointsArray[4];
int y3 = pointsArray[5];
int x4 = pointsArray[6];
int y4 = pointsArray[7];
// (x,y) is bottom left corner, so we need minimum x and y coordinates
int x = Math.min(Math.min(x1, x2), Math.min(x3, x4));
int y = Math.min(Math.min(y1, y2), Math.min(y3, y4));
int width = Math.abs(x1 - x2);
int height = Math.abs(y1 - y4);
Rectangle r = new Rectangle(x, y, width, height);
return r;
}
void setClipping(long clipRgn) {
if (clipRgn == 0) {
if (data.clipRgn != 0) {
Cairo.cairo_region_destroy(data.clipRgn);
data.clipRgn = 0;
}
data.clippingTransform = null;
setCairoClip(data.damageRgn, 0);
} else {
if (data.clipRgn == 0) data.clipRgn = Cairo.cairo_region_create();
Cairo.cairo_region_subtract(data.clipRgn, data.clipRgn);
Cairo.cairo_region_union(data.clipRgn, clipRgn);
if (currentTransform != null) {
// store the current transformation, to use it when the user requests clipping bounds
data.clippingTransform = currentTransform.clone();
} else {
data.clippingTransform = null;
}
setCairoClip(data.damageRgn, clipRgn);
}
}
/**
* Sets the area of the receiver which can be changed
* by drawing operations to the rectangular area specified
* by the arguments.
*
* @param x the x coordinate of the clipping rectangle
* @param y the y coordinate of the clipping rectangle
* @param width the width of the clipping rectangle
* @param height the height of the clipping rectangle
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void setClipping(int x, int y, int width, int height) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
setClippingInPixels(DPIUtil.autoScaleUp(drawable, x), DPIUtil.autoScaleUp(drawable, y), DPIUtil.autoScaleUp(drawable, width), DPIUtil.autoScaleUp(drawable, height));
}
void setClippingInPixels(int x, int y, int width, int height) {
if (width < 0) {
x = x + width;
width = -width;
}
if (height < 0) {
y = y + height;
height = -height;
}
cairo_rectangle_int_t rect = new cairo_rectangle_int_t();
rect.x = x;
rect.y = y;
rect.width = width;
rect.height = height;
long clipRgn = Cairo.cairo_region_create();
Cairo.cairo_region_union_rectangle(clipRgn, rect);
setClipping(clipRgn);
Cairo.cairo_region_destroy(clipRgn);
}
/**
* Sets the area of the receiver which can be changed
* by drawing operations to the path specified
* by the argument.
*
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
*
ERROR_INVALID_ARGUMENT - if the path has been disposed
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available
*
*
* @see Path
* @see #getAdvanced
* @see #setAdvanced
*
* @since 3.1
*/
public void setClipping(Path path) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (path != null && path.isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
resetClipping();
if (path != null) {
initCairo();
long cairo = data.cairo;
long copy = Cairo.cairo_copy_path(path.handle);
if (copy == 0) SWT.error(SWT.ERROR_NO_HANDLES);
Cairo.cairo_append_path(cairo, copy);
Cairo.cairo_path_destroy(copy);
Cairo.cairo_clip(cairo);
}
}
/**
* Sets the area of the receiver which can be changed
* by drawing operations to the rectangular area specified
* by the argument. Specifying null for the
* rectangle reverts the receiver's clipping area to its
* original value.
*
* @param rect the clipping rectangle or null
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void setClipping(Rectangle rect) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
setClippingInPixels(DPIUtil.autoScaleUp(drawable, rect));
}
void setClippingInPixels(Rectangle rect) {
if (rect == null) {
resetClipping();
} else {
setClippingInPixels(rect.x, rect.y, rect.width, rect.height);
}
}
private void resetClipping() {
/*
* Bug 531667: widgets paint over other widgets
*
* The Cairo handle is shared by all widgets, and GC.setClipping(0) allows painting outside the current GC area.
* So if we reset any custom clipping we still want to restrict GC operations with the initial GC clipping.
*/
setClipping(clipping);
}
/**
* Sets the area of the receiver which can be changed
* by drawing operations to the region specified
* by the argument. Specifying null for the
* region reverts the receiver's clipping area to its
* original value.
*
* @param region the clipping region or null
*
* @exception IllegalArgumentException
*
ERROR_INVALID_ARGUMENT - if the region has been disposed
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void setClipping(Region region) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (region != null && region.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if (region != null) {
setClipping(region.handle);
} else {
resetClipping();
}
}
/**
* Sets the font which will be used by the receiver
* to draw and measure text to the argument. If the
* argument is null, then a default font appropriate
* for the platform will be used instead.
*
* @param font the new font for the receiver, or null to indicate a default font
*
* @exception IllegalArgumentException
*
ERROR_INVALID_ARGUMENT - if the font has been disposed
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void setFont(Font font) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (font != null && font.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
data.font = font != null ? font : data.device.systemFont;
data.state &= ~FONT;
data.stringWidth = data.stringHeight = -1;
}
/**
* Sets the receiver's fill rule to the parameter, which must be one of
* SWT.FILL_EVEN_ODD or SWT.FILL_WINDING.
*
* @param rule the new fill rule
*
* @exception IllegalArgumentException
*
ERROR_INVALID_ARGUMENT - if the rule is not one of SWT.FILL_EVEN_ODD
* or SWT.FILL_WINDING
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @since 3.1
*/
public void setFillRule(int rule) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
int cairo_mode = Cairo.CAIRO_FILL_RULE_EVEN_ODD;
switch (rule) {
case SWT.FILL_WINDING:
cairo_mode = Cairo.CAIRO_FILL_RULE_WINDING; break;
case SWT.FILL_EVEN_ODD:
cairo_mode = Cairo.CAIRO_FILL_RULE_EVEN_ODD; break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
initCairo();
Cairo.cairo_set_fill_rule(data.cairo, cairo_mode);
}
/**
* Sets the foreground color. The foreground color is used
* for drawing operations including when text is drawn.
*
* @param color the new foreground color for the receiver
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the color is null
*
ERROR_INVALID_ARGUMENT - if the color has been disposed
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void setForeground(Color color) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (color == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (color.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
data.foregroundRGBA = color.handle;
data.foregroundPattern = null;
data.state &= ~FOREGROUND;
}
/**
* Sets the foreground pattern. The default value is null.
*
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
*
* @param pattern the new foreground pattern
*
* @exception IllegalArgumentException
*
ERROR_INVALID_ARGUMENT - if the parameter has been disposed
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available
*
*
* @see Pattern
* @see #getAdvanced
* @see #setAdvanced
*
* @since 3.1
*/
public void setForegroundPattern(Pattern pattern) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (pattern != null && pattern.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if (data.cairo == 0 && pattern == null) return;
initCairo();
if (data.foregroundPattern == pattern) return;
data.foregroundPattern = pattern;
data.state &= ~FOREGROUND;
}
/**
* Sets the receiver's interpolation setting to the parameter, which
* must be one of SWT.DEFAULT, SWT.NONE,
* SWT.LOW or SWT.HIGH.
*
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
*
*
* @param interpolation the new interpolation setting
*
* @exception IllegalArgumentException
*
ERROR_INVALID_ARGUMENT - if the rule is not one of SWT.DEFAULT,
* SWT.NONE, SWT.LOW or SWT.HIGH
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available
*
*
* @see #getAdvanced
* @see #setAdvanced
*
* @since 3.1
*/
public void setInterpolation(int interpolation) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (data.cairo == 0 && interpolation == SWT.DEFAULT) return;
switch (interpolation) {
case SWT.DEFAULT:
case SWT.NONE:
case SWT.LOW:
case SWT.HIGH:
break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
initCairo();
data.interpolation = interpolation;
}
/**
* Sets the receiver's line attributes.
*
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
*
* @param attributes the line attributes
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the attributes is null
*
ERROR_INVALID_ARGUMENT - if any of the line attributes is not valid
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available
*
*
* @see LineAttributes
* @see #getAdvanced
* @see #setAdvanced
*
* @since 3.3
*/
public void setLineAttributes(LineAttributes attributes) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (attributes == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
attributes.width = DPIUtil.autoScaleUp(drawable, attributes.width);
setLineAttributesInPixels(attributes);
}
void setLineAttributesInPixels(LineAttributes attributes) {
int mask = 0;
float lineWidth = attributes.width;
if (lineWidth != data.lineWidth) {
mask |= LINE_WIDTH | DRAW_OFFSET;
}
int lineStyle = attributes.style;
if (lineStyle != data.lineStyle) {
mask |= LINE_STYLE;
switch (lineStyle) {
case SWT.LINE_SOLID:
case SWT.LINE_DASH:
case SWT.LINE_DOT:
case SWT.LINE_DASHDOT:
case SWT.LINE_DASHDOTDOT:
break;
case SWT.LINE_CUSTOM:
if (attributes.dash == null) lineStyle = SWT.LINE_SOLID;
break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
}
int join = attributes.join;
if (join != data.lineJoin) {
mask |= LINE_JOIN;
switch (join) {
case SWT.JOIN_MITER:
case SWT.JOIN_ROUND:
case SWT.JOIN_BEVEL:
break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
}
int cap = attributes.cap;
if (cap != data.lineCap) {
mask |= LINE_CAP;
switch (cap) {
case SWT.CAP_FLAT:
case SWT.CAP_ROUND:
case SWT.CAP_SQUARE:
break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
}
float[] dashes = attributes.dash;
float[] lineDashes = data.lineDashes;
if (dashes != null && dashes.length > 0) {
boolean changed = lineDashes == null || lineDashes.length != dashes.length;
for (int i = 0; i < dashes.length; i++) {
float dash = dashes[i];
if (dash <= 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if (!changed && lineDashes[i] != dash) changed = true;
}
if (changed) {
float[] newDashes = new float[dashes.length];
System.arraycopy(dashes, 0, newDashes, 0, dashes.length);
dashes = newDashes;
mask |= LINE_STYLE;
} else {
dashes = lineDashes;
}
} else {
if (lineDashes != null && lineDashes.length > 0) {
mask |= LINE_STYLE;
} else {
dashes = lineDashes;
}
}
float dashOffset = attributes.dashOffset;
if (dashOffset != data.lineDashesOffset) {
mask |= LINE_STYLE;
}
float miterLimit = attributes.miterLimit;
if (miterLimit != data.lineMiterLimit) {
mask |= LINE_MITERLIMIT;
}
initCairo();
if (mask == 0) return;
data.lineWidth = lineWidth;
data.lineStyle = lineStyle;
data.lineCap = cap;
data.lineJoin = join;
data.lineDashes = dashes;
data.lineDashesOffset = dashOffset;
data.lineMiterLimit = miterLimit;
data.state &= ~mask;
}
/**
* Sets the receiver's line cap style to the argument, which must be one
* of the constants SWT.CAP_FLAT, SWT.CAP_ROUND,
* or SWT.CAP_SQUARE.
*
* @param cap the cap style to be used for drawing lines
*
* @exception IllegalArgumentException
*
ERROR_INVALID_ARGUMENT - if the style is not valid
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @since 3.1
*/
public void setLineCap(int cap) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (data.lineCap == cap) return;
switch (cap) {
case SWT.CAP_ROUND:
case SWT.CAP_FLAT:
case SWT.CAP_SQUARE:
break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
data.lineCap = cap;
data.state &= ~LINE_CAP;
}
/**
* Sets the receiver's line dash style to the argument. The default
* value is null. If the argument is not null,
* the receiver's line style is set to SWT.LINE_CUSTOM, otherwise
* it is set to SWT.LINE_SOLID.
*
* @param dashes the dash style to be used for drawing lines
*
* @exception IllegalArgumentException
*
ERROR_INVALID_ARGUMENT - if any of the values in the array is less than or equal 0
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @since 3.1
*/
public void setLineDash(int[] dashes) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
float[] lineDashes = data.lineDashes;
if (dashes != null && dashes.length > 0) {
boolean changed = data.lineStyle != SWT.LINE_CUSTOM || lineDashes == null || lineDashes.length != dashes.length;
for (int i = 0; i < dashes.length; i++) {
int dash = dashes[i];
if (dash <= 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if (!changed && lineDashes[i] != dash) changed = true;
}
if (!changed) return;
data.lineDashes = new float[dashes.length];
for (int i = 0; i < dashes.length; i++) {
data.lineDashes[i] = dashes[i];
}
data.lineStyle = SWT.LINE_CUSTOM;
} else {
if (data.lineStyle == SWT.LINE_SOLID && (lineDashes == null || lineDashes.length == 0)) return;
data.lineDashes = null;
data.lineStyle = SWT.LINE_SOLID;
}
data.state &= ~LINE_STYLE;
}
/**
* Sets the receiver's line join style to the argument, which must be one
* of the constants SWT.JOIN_MITER, SWT.JOIN_ROUND,
* or SWT.JOIN_BEVEL.
*
* @param join the join style to be used for drawing lines
*
* @exception IllegalArgumentException
*
ERROR_INVALID_ARGUMENT - if the style is not valid
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @since 3.1
*/
public void setLineJoin(int join) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (data.lineJoin == join) return;
switch (join) {
case SWT.JOIN_MITER:
case SWT.JOIN_ROUND:
case SWT.JOIN_BEVEL:
break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
data.lineJoin = join;
data.state &= ~LINE_JOIN;
}
/**
* Sets the receiver's line style to the argument, which must be one
* of the constants SWT.LINE_SOLID, SWT.LINE_DASH,
* SWT.LINE_DOT, SWT.LINE_DASHDOT or
* SWT.LINE_DASHDOTDOT.
*
* @param lineStyle the style to be used for drawing lines
*
* @exception IllegalArgumentException
*
ERROR_INVALID_ARGUMENT - if the style is not valid
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void setLineStyle(int lineStyle) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (data.lineStyle == lineStyle) return;
switch (lineStyle) {
case SWT.LINE_SOLID:
case SWT.LINE_DASH:
case SWT.LINE_DOT:
case SWT.LINE_DASHDOT:
case SWT.LINE_DASHDOTDOT:
break;
case SWT.LINE_CUSTOM:
if (data.lineDashes == null) lineStyle = SWT.LINE_SOLID;
break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
data.lineStyle = lineStyle;
data.state &= ~LINE_STYLE;
}
/**
* Sets the width that will be used when drawing lines
* for all of the figure drawing operations (that is,
* drawLine, drawRectangle,
* drawPolyline, and so forth.
*
* Note that line width of zero is used as a hint to
* indicate that the fastest possible line drawing
* algorithms should be used. This means that the
* output may be different from line width one and
* specially at high DPI it's not recommended to mix
* line width zero with other line widths.
*
*
* @param lineWidth the width of a line
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void setLineWidth(int lineWidth) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
setLineWidthInPixels(DPIUtil.autoScaleUp(drawable, lineWidth));
}
void setLineWidthInPixels(int lineWidth) {
if (data.lineWidth == lineWidth) return;
data.lineWidth = lineWidth;
data.state &= ~(LINE_WIDTH | DRAW_OFFSET);
}
void setString(String string, int flags) {
if (data.layout == 0) createLayout();
if (string == data.string && (flags & ~SWT.DRAW_TRANSPARENT) == (data.drawFlags & ~SWT.DRAW_TRANSPARENT)) {
return;
}
byte[] buffer;
int mnemonic, length = string.length ();
long layout = data.layout;
char[] text = new char[length];
string.getChars(0, length, text, 0);
if ((flags & SWT.DRAW_MNEMONIC) != 0 && (mnemonic = fixMnemonic(text)) != -1) {
char[] text1 = new char[mnemonic - 1];
System.arraycopy(text, 0, text1, 0, text1.length);
byte[] buffer1 = Converter.wcsToMbcs(text1, false);
char[] text2 = new char[text.length - mnemonic];
System.arraycopy(text, mnemonic - 1, text2, 0, text2.length);
byte[] buffer2 = Converter.wcsToMbcs(text2, false);
buffer = new byte[buffer1.length + buffer2.length];
System.arraycopy(buffer1, 0, buffer, 0, buffer1.length);
System.arraycopy(buffer2, 0, buffer, buffer1.length, buffer2.length);
long attr_list = OS.pango_attr_list_new();
long attr = OS.pango_attr_underline_new(OS.PANGO_UNDERLINE_LOW);
PangoAttribute attribute = new PangoAttribute();
OS.memmove(attribute, attr, PangoAttribute.sizeof);
attribute.start_index = buffer1.length;
attribute.end_index = buffer1.length + 1;
OS.memmove(attr, attribute, PangoAttribute.sizeof);
OS.pango_attr_list_insert(attr_list, attr);
OS.pango_layout_set_attributes(layout, attr_list);
OS.pango_attr_list_unref(attr_list);
} else {
buffer = Converter.wcsToMbcs(text, false);
OS.pango_layout_set_attributes(layout, 0);
}
OS.pango_layout_set_text(layout, buffer, buffer.length);
OS.pango_layout_set_single_paragraph_mode(layout, (flags & SWT.DRAW_DELIMITER) == 0);
OS.pango_layout_set_tabs(layout, (flags & SWT.DRAW_TAB) != 0 ? 0 : data.device.emptyTab);
data.string = string;
data.stringWidth = data.stringHeight = -1;
data.drawFlags = flags;
}
/**
* Sets the receiver's text anti-aliasing value to the parameter,
* which must be one of SWT.DEFAULT, SWT.OFF
* or SWT.ON. Note that this controls anti-aliasing only
* for all text drawing operations.
*
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
*
ERROR_INVALID_ARGUMENT - if the parameter is not one of SWT.DEFAULT,
* SWT.OFF or SWT.ON
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available
*
*
* @see #getAdvanced
* @see #setAdvanced
* @see #setAntialias
*
* @since 3.1
*/
public void setTextAntialias(int antialias) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (data.cairo == 0 && antialias == SWT.DEFAULT) return;
int mode = 0;
switch (antialias) {
case SWT.DEFAULT: mode = Cairo.CAIRO_ANTIALIAS_DEFAULT; break;
case SWT.OFF: mode = Cairo.CAIRO_ANTIALIAS_NONE; break;
case SWT.ON: mode = Cairo.CAIRO_ANTIALIAS_GRAY;
break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
initCairo();
long options = Cairo.cairo_font_options_create();
Cairo.cairo_font_options_set_antialias(options, mode);
if (data.context == 0) createLayout();
OS.pango_cairo_context_set_font_options(data.context, options);
Cairo.cairo_font_options_destroy(options);
}
/**
* Sets the transform that is currently being used by the receiver. If
* the argument is null, the current transform is set to
* the identity transform.
*
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
*
*
* @param transform the transform to set
*
* @exception IllegalArgumentException
*
ERROR_INVALID_ARGUMENT - if the parameter has been disposed
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available
*
*
* @see Transform
* @see #getAdvanced
* @see #setAdvanced
*
* @since 3.1
*/
public void setTransform(Transform transform) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (transform != null && transform.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if (data.cairo == 0 && transform == null) return;
initCairo();
long cairo = data.cairo;
// Re-set the original Cairo transformation matrix: it contains a translation relative to the parent widget.
if (currentTransform != null) {
Cairo.cairo_set_matrix(cairo, cairoTransformationMatrix);
currentTransform = null;
}
// Apply user transform on top of the current transformation matrix (and remember it)
if (transform != null) {
currentTransform = transform.handle.clone();
double[] transformMatrix = identity();
Cairo.cairo_matrix_multiply(transformMatrix, transform.handle, transformMatrix);
Cairo.cairo_transform(cairo, transformMatrix);
}
data.state &= ~DRAW_OFFSET;
}
/**
* If the argument is true, puts the receiver
* in a drawing mode where the resulting color in the destination
* is the exclusive or of the color values in the source
* and the destination, and if the argument is false,
* puts the receiver in a drawing mode where the destination color
* is replaced with the source color value.
*
* @param xor if true, then xor mode is used, otherwise source copy mode is used
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void setXORMode(boolean xor) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
Cairo.cairo_set_operator(handle, xor ? Cairo.CAIRO_OPERATOR_DIFFERENCE : Cairo.CAIRO_OPERATOR_OVER);
data.xorMode = xor;
}
/**
* Returns the extent of the given string. No tab
* expansion or carriage return processing will be performed.
*
* The extent of a string is the width and height of
* the rectangular area it would cover if drawn in a particular
* font (in this case, the current font in the receiver).
*
*
* @param string the string to measure
* @return a point containing the extent of the string
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the string is null
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public Point stringExtent(String string) {
return DPIUtil.autoScaleDown(drawable, stringExtentInPixels(string));
}
Point stringExtentInPixels(String string) {
return textExtentInPixels(string, 0);
}
/**
* Returns the extent of the given string. Tab expansion and
* carriage return processing are performed.
*
* The extent of a string is the width and height of
* the rectangular area it would cover if drawn in a particular
* font (in this case, the current font in the receiver).
*
*
* @param string the string to measure
* @return a point containing the extent of the string
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the string is null
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public Point textExtent(String string) {
return DPIUtil.autoScaleDown(drawable, textExtentInPixels(string));
}
Point textExtentInPixels(String string) {
return textExtentInPixels(string, SWT.DRAW_DELIMITER | SWT.DRAW_TAB);
}
/**
* Returns the extent of the given string. Tab expansion, line
* delimiter and mnemonic processing are performed according to
* the specified flags, which can be a combination of:
*
*
DRAW_DELIMITER
*
draw multiple lines
*
DRAW_TAB
*
expand tabs
*
DRAW_MNEMONIC
*
underline the mnemonic character
*
DRAW_TRANSPARENT
*
transparent background
*
*
* The extent of a string is the width and height of
* the rectangular area it would cover if drawn in a particular
* font (in this case, the current font in the receiver).
*
*
* @param string the string to measure
* @param flags the flags specifying how to process the text
* @return a point containing the extent of the string
*
* @exception IllegalArgumentException
*
ERROR_NULL_ARGUMENT - if the string is null
*
* @exception SWTException
*
ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public Point textExtent(String string, int flags) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (string == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
return DPIUtil.autoScaleDown(drawable, textExtentInPixels(string, flags));
}
Point textExtentInPixels(String string, int flags) {
setString(string, flags);
checkGC(FONT);
if (data.stringWidth == -1) {
computeStringSize();
}
return new Point(data.stringWidth, data.stringHeight);
}
/**
* Returns a string containing a concise, human-readable
* description of the receiver.
*
* @return a string representation of the receiver
*/
@Override
public String toString () {
if (isDisposed()) return "GC {*DISPOSED*}";
return "GC {" + handle + "}";
}
}
