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/*******************************************************************************
* Copyright (c) 2019 Red Hat and others. All rights reserved.
* The contents of this file are made available under the terms
* of the GNU Lesser General Public License (LGPL) Version 2.1 that
* accompanies this distribution (lgpl-v21.txt). The LGPL is also
* available at http://www.gnu.org/licenses/lgpl.html. If the version
* of the LGPL at http://www.gnu.org is different to the version of
* the LGPL accompanying this distribution and there is any conflict
* between the two license versions, the terms of the LGPL accompanying
* this distribution shall govern.
*
* Contributors:
* Red Hat - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.graphics;
import java.io.*;
import java.util.*;
import java.util.List;
import org.eclipse.swt.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.gtk.*;
import org.eclipse.swt.internal.image.*;
import org.eclipse.swt.widgets.*;
/**
* Instances of this class are used to load images from,
* and save images to, a file or stream.
*
* Currently supported image formats are:
*
* - BMP (Windows or OS/2 Bitmap)
* - ICO (Windows Icon)
* - JPEG
* - GIF
* - PNG
* - TIFF
*
* ImageLoaders
can be used to:
*
* - load/save single images in all formats
* - load/save multiple images (GIF/ICO/TIFF)
* - load/save animated GIF images
* - load interlaced GIF/PNG images
* - load progressive JPEG images
*
*
*
* NOTE: ImageLoader
is implemented in Java on some platforms, which has
* certain performance implications. Performance and memory sensitive applications may
* benefit from using one of the constructors provided by Image
, as these
* are implemented natively.
*
* @see SWT Example: ImageAnalyzer
* @see Sample code and further information
*/
public class ImageLoader {
/**
* the array of ImageData objects in this ImageLoader.
* This array is read in when the load method is called,
* and it is written out when the save method is called
*/
public ImageData[] data;
/**
* the width of the logical screen on which the images
* reside, in pixels (this corresponds to the GIF89a
* Logical Screen Width value)
*/
public int logicalScreenWidth;
/**
* the height of the logical screen on which the images
* reside, in pixels (this corresponds to the GIF89a
* Logical Screen Height value)
*/
public int logicalScreenHeight;
/**
* the background pixel for the logical screen (this
* corresponds to the GIF89a Background Color Index value).
* The default is -1 which means 'unspecified background'
*/
public int backgroundPixel;
/**
* the number of times to repeat the display of a sequence
* of animated images (this corresponds to the commonly-used
* GIF application extension for "NETSCAPE 2.0 01").
* The default is 1. A value of 0 means 'display repeatedly'
*/
public int repeatCount;
/**
* This is the compression used when saving jpeg and png files.
*
* When saving jpeg files, the value is from 1 to 100,
* where 1 is very high compression but low quality, and 100 is
* no compression and high quality; default is 75.
*
* When saving png files, the value is from 0 to 3, but they do not impact the quality
* because PNG is lossless compression. 0 is uncompressed, 1 is low compression and fast,
* 2 is default compression, and 3 is high compression but slow.
*
*
* @since 3.8
*/
public int compression;
/**
* If the 29th byte of the PNG file is not zero, then it is interlaced.
*/
final static int PNG_INTERLACE_METHOD_OFFSET = 28;
/*
* the set of ImageLoader event listeners, created on demand
*/
List imageLoaderListeners;
/**
* Construct a new empty ImageLoader.
*/
public ImageLoader() {
reset();
}
/**
* Resets the fields of the ImageLoader, except for the
* imageLoaderListeners
field.
*/
void reset() {
data = null;
logicalScreenWidth = 0;
logicalScreenHeight = 0;
backgroundPixel = -1;
repeatCount = 1;
compression = -1;
}
/**
* Loads an array of ImageData
objects from the
* specified input stream. Throws an error if either an error
* occurs while loading the images, or if the images are not
* of a supported type. Returns the loaded image data array.
*
* @param stream the input stream to load the images from
* @return an array of ImageData
objects loaded from the specified input stream
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the stream is null
*
* @exception SWTException
* - ERROR_IO - if an IO error occurs while reading from the stream
* - ERROR_INVALID_IMAGE - if the image stream contains invalid data
* - ERROR_UNSUPPORTED_FORMAT - if the image stream contains an unrecognized format
*
*/
public ImageData[] load(InputStream stream) {
if (stream == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
reset();
ImageData [] imgDataArray = getImageDataArrayFromStream(stream);
data = imgDataArray;
return imgDataArray;
}
/**
* Return true if the image is an interlaced PNG file.
* This is used to check whether ImageLoaderEvent should be fired when loading images.
* @return true iff 29th byte of PNG files is not zero
*/
boolean isInterlacedPNG(byte [] imageAsByteArray) {
return imageAsByteArray.length > PNG_INTERLACE_METHOD_OFFSET && imageAsByteArray[PNG_INTERLACE_METHOD_OFFSET] != 0;
}
ImageData [] getImageDataArrayFromStream(InputStream stream) {
long loader = GDK.gdk_pixbuf_loader_new();
List imgDataList = new ArrayList<>();
try {
// 1) Load InputStream into byte array
ByteArrayOutputStream baos = new ByteArrayOutputStream();
stream.transferTo(baos);
baos.flush();
byte[] data_buffer = baos.toByteArray();
if (data_buffer.length == 0) SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT); // empty stream
// 2) Copy byte array to C memory, write to GdkPixbufLoader
long buffer_ptr = OS.g_malloc(data_buffer.length);
C.memmove(buffer_ptr, data_buffer, data_buffer.length);
long [] error = new long [1];
GDK.gdk_pixbuf_loader_write(loader, buffer_ptr, data_buffer.length, error);
if(error[0] != 0) {
/* Bug 576484
* It is safe just to assume if this fails it is most likely an IO error
* since unsupported format is checked before, and invalid image right after.
* Still, check if it belongs to the G_FILE_ERROR domain and IO error code
*/
if(OS.g_error_matches(error[0], OS.g_file_error_quark(), OS.G_FILE_ERROR_IO)){
SWT.error(SWT.ERROR_IO, null, Display.extractFreeGError(error[0]));
} else {
OS.g_error_free(error[0]);
}
}
GDK.gdk_pixbuf_loader_close(loader, null);
// 3) Get GdkPixbufAnimation from loader
long pixbuf_animation = GDK.gdk_pixbuf_loader_get_animation(loader);
if (pixbuf_animation == 0) SWT.error(SWT.ERROR_INVALID_IMAGE);
boolean isStatic = GDK.gdk_pixbuf_animation_is_static_image(pixbuf_animation);
if (isStatic) {
// Static image, get as single pixbuf and convert it to ImageData
long pixbuf = GDK.gdk_pixbuf_animation_get_static_image(pixbuf_animation);
ImageData imgData = pixbufToImageData(pixbuf);
imgData.type = getImageFormat(loader);
imgDataList.add(imgData);
} else {
// Image with multiple frames, iterate through each frame and convert
// each frame to ImageData
long start_time = OS.g_malloc(8);
OS.g_get_current_time(start_time);
long animation_iter = GDK.gdk_pixbuf_animation_get_iter (pixbuf_animation, start_time);
int delay_time = 0;
int time_offset = 0;
// Fix the number of GIF frames as GdkPixbufAnimation does not provide an API to
// determine number of frames.
int num_frames = 32;
for (int i = 0; i < num_frames; i++) {
// Calculate time offset from start_time to next frame
delay_time = GDK.gdk_pixbuf_animation_iter_get_delay_time (animation_iter);
time_offset += delay_time;
OS.g_time_val_add(start_time, time_offset * 1000);
boolean update = GDK.gdk_pixbuf_animation_iter_advance (animation_iter, start_time);
if (update) {
long curr_pixbuf = GDK.gdk_pixbuf_animation_iter_get_pixbuf (animation_iter);
long pixbuf_copy = GDK.gdk_pixbuf_copy(curr_pixbuf); // copy because curr_pixbuf might get disposed on next advance
ImageData imgData = pixbufToImageData(pixbuf_copy);
if (this.logicalScreenHeight == 0 && this.logicalScreenWidth == 0) {
this.logicalScreenHeight = imgData.height;
this.logicalScreenWidth = imgData.width;
}
OS.g_object_unref(pixbuf_copy);
imgData.type = getImageFormat(loader);
imgData.delayTime = delay_time;
imgDataList.add(imgData);
} else {
break;
}
}
}
ImageData [] imgDataArray = new ImageData [imgDataList.size()];
for (int i = 0; i < imgDataList.size(); i++) {
imgDataArray [i] = imgDataList.get(i);
// Loading completed, notify listeners
// listener should only be called when loading interlaced/progressive PNG/JPG/GIF ?
ImageData data = (ImageData) imgDataArray [i].clone();
if (this.hasListeners() && imgDataArray != null) {
if (data.type == SWT.IMAGE_PNG && isInterlacedPNG(data_buffer)) {
this.notifyListeners(new ImageLoaderEvent(this, data, i, true));
} else if (data.type != SWT.IMAGE_PNG) {
this.notifyListeners(new ImageLoaderEvent(this, data, i, true));
}
}
}
OS.g_free(buffer_ptr);
OS.g_object_unref(loader);
stream.close();
return imgDataArray;
} catch (IOException e) {
SWT.error(SWT.ERROR_IO);
}
return null;
}
/**
* Loads an array of ImageData
objects from the
* file with the specified name. Throws an error if either
* an error occurs while loading the images, or if the images are
* not of a supported type. Returns the loaded image data array.
*
* @param filename the name of the file to load the images from
* @return an array of ImageData
objects loaded from the specified file
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the file name is null
*
* @exception SWTException
* - ERROR_IO - if an IO error occurs while reading from the file
* - ERROR_INVALID_IMAGE - if the image file contains invalid data
* - ERROR_UNSUPPORTED_FORMAT - if the image file contains an unrecognized format
*
*/
public ImageData[] load(String filename) {
if (filename == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
InputStream stream = null;
try {
stream = new FileInputStream(filename);
return load(stream);
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
} finally {
try {
if (stream != null) stream.close();
} catch (IOException e) {
// Ignore error
}
}
return null;
}
/**
* Load GdkPixbuf directly using gdk_pixbuf_new_from_file,
* without FileInputStream.
*/
ImageData[] loadFromFile(String filename) {
long pixbuf = gdk_pixbuf_new_from_file(filename);
if (pixbuf == 0) return null;
ImageData imgData= pixbufToImageData(pixbuf);
return data = new ImageData[] {imgData};
}
/**
* Return the type of file from which the image was read
* by inspecting GdkPixbufFormat from GdkPixbufLoader
*
* It is expressed as one of the following values:
*
* IMAGE_BMP
* - Windows BMP file format, no compression
* IMAGE_BMP_RLE
* - Windows BMP file format, RLE compression if appropriate
* IMAGE_GIF
* - GIF file format
* IMAGE_ICO
* - Windows ICO file format
* IMAGE_JPEG
* - JPEG file format
* IMAGE_PNG
* - PNG file format
*
*/
int getImageFormat(long loader) {
long format = GDK.gdk_pixbuf_loader_get_format(loader);
long name = GDK.gdk_pixbuf_format_get_name(format);
String nameStr = Converter.cCharPtrToJavaString(name, false);
OS.g_free(name);
switch (nameStr) {
case "bmp": return SWT.IMAGE_BMP;
case "gif": return SWT.IMAGE_GIF;
case "ico": return SWT.IMAGE_ICO;
case "jpeg": return SWT.IMAGE_JPEG;
case "png": return SWT.IMAGE_PNG;
case "svg": return SWT.IMAGE_SVG;
default: return SWT.IMAGE_UNDEFINED;
}
}
/**
* Convert GdkPixbuf pointer to Java object ImageData
* @return ImageData with pixbuf data
*/
static ImageData pixbufToImageData(long pixbuf) {
boolean hasAlpha = GDK.gdk_pixbuf_get_has_alpha(pixbuf);
int width = GDK.gdk_pixbuf_get_width(pixbuf);
int height = GDK.gdk_pixbuf_get_height(pixbuf);
int stride = GDK.gdk_pixbuf_get_rowstride(pixbuf);
int n_channels = GDK.gdk_pixbuf_get_n_channels(pixbuf); // only 3 or 4 samples per pixel are supported
int bits_per_sample = GDK.gdk_pixbuf_get_bits_per_sample(pixbuf); // only 8 bit per sample are supported
long pixels = GDK.gdk_pixbuf_get_pixels(pixbuf);
/*
* From GDK Docs: last row in the pixbuf may not be as wide as the full rowstride,
* but rather just as wide as the pixel data needs to be. Compute the width in bytes
* of the last row to copy raw pixbuf data.
*/
int lastRowWidth = width * ((n_channels * bits_per_sample + 7) / 8);
byte[] srcData = new byte[stride * height];
C.memmove(srcData, pixels, stride * (height - 1) + lastRowWidth);
/*
* Note: GdkPixbuf only supports 3/4 n_channels and 8 bits_per_sample,
* This means all images are of depth 24 / depth 32. This means loading
* images will result in a direct PaletteData with RGB masks, since
* there is no way to determine indexed PaletteData info.
*
* See https://www.eclipse.org/articles/Article-SWT-images/graphics-resources.html#PaletteData
*/
PaletteData palette = new PaletteData(0xFF0000, 0xFF00, 0xFF);
ImageData imgData = new ImageData(width, height, bits_per_sample * n_channels, palette, stride, srcData);
if (hasAlpha) {
byte[] alphaData = imgData.alphaData = new byte[width * height];
for (int y = 0, offset = 0, alphaOffset = 0; y < height; y++) {
for (int x = 0; x < width; x++, offset += n_channels) {
byte r = srcData[offset + 0];
byte g = srcData[offset + 1];
byte b = srcData[offset + 2];
byte a = srcData[offset + 3];
srcData[offset + 0] = 0;
alphaData[alphaOffset++] = a;
if (a != 0) {
srcData[offset + 1] = r;
srcData[offset + 2] = g;
srcData[offset + 3] = b;
}
}
}
} else {
for (int y = 0, offset = 0; y < height; y++) {
for (int x = 0; x < width; x++, offset += n_channels) {
byte r = srcData[offset + 0];
byte g = srcData[offset + 1];
byte b = srcData[offset + 2];
srcData[offset + 0] = r;
srcData[offset + 1] = g;
srcData[offset + 2] = b;
}
}
}
return imgData;
}
/**
* Returns GdkPixbuf pointer by loading an image from filename (Java string)
*/
static long gdk_pixbuf_new_from_file(String filename) {
int length = filename.length ();
char [] chars = new char [length];
filename.getChars (0, length, chars, 0);
byte [] buffer = Converter.wcsToMbcs(chars, true);
return GDK.gdk_pixbuf_new_from_file(buffer, null);
}
/**
* Saves the image data in this ImageLoader to the specified stream.
* The format parameter can have one of the following values:
*
* IMAGE_BMP
* - Windows BMP file format, no compression
* IMAGE_BMP_RLE
* - Windows BMP file format, RLE compression if appropriate
* IMAGE_GIF
* - GIF file format
* IMAGE_ICO
* - Windows ICO file format
* IMAGE_JPEG
* - JPEG file format
* IMAGE_PNG
* - PNG file format
*
*
* @param stream the output stream to write the images to
* @param format the format to write the images in
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the stream is null
*
* @exception SWTException
* - ERROR_IO - if an IO error occurs while writing to the stream
* - ERROR_INVALID_IMAGE - if the image data contains invalid data
* - ERROR_UNSUPPORTED_FORMAT - if the image data cannot be saved to the requested format
*
*/
public void save(OutputStream stream, int format) {
if (stream == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (format == -1) SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT);
if (this.data == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
ImageData imgData = this.data [0];
int colorspace = GDK.GDK_COLORSPACE_RGB;
boolean alpha_supported = format == SWT.IMAGE_TIFF || format == SWT.IMAGE_PNG || format == SWT.IMAGE_ICO;
boolean has_alpha = imgData.alphaData != null && alpha_supported;
int width = imgData.width;
int height = imgData.height;
// original n_channels. Native implementation will only be used in case of 3 or 4
int n_channels = imgData.bytesPerLine / width;
// Native implementation only supports a subset of possible image configurations.
// Redirect the not supported variants to the Java implementation.
// See also https://bugs.eclipse.org/bugs/show_bug.cgi?id=558043
if (!imgData.palette.isDirect || n_channels < 3 || n_channels > 4) {
FileFormat.save(stream, format, this);
return;
}
/*
* Destination offsets, GdkPixbuf data is stored in RGBA format.
*/
int da = 3; int dr = 0; int dg = 1; int db = 2;
/*
* ImageData offsets. These can vary depending on how the ImageData.data
* field was populated. In most cases it will be RGB format, so this case
* is assumed (blue shift is 0).
*
* If blue is negatively shifted, then we are dealing with BGR byte ordering, so
* adjust the offsets accordingly.
*/
int or = 0; int og = 1; int ob = 2;
PaletteData palette = imgData.palette;
if (palette.isDirect && palette.blueShift < 0) {
or = 2;
og = 1;
ob = 0;
}
// We use alpha by default now so all images saved are 32 bit, if there is no alpha we set it to 255
int bytes_per_pixel = 4;
byte[] srcData = new byte[(width * height * bytes_per_pixel)];
int alpha_offset = n_channels == 4 ? 1 : 0;
if (has_alpha) {
for (int y = 0, offset = 0, new_offset = 0, alphaIndex = 0; y < height; y++) {
for (int x = 0; x < width; x++, offset += n_channels, new_offset += bytes_per_pixel) {
byte a = imgData.alphaData[alphaIndex++];
byte r = imgData.data[offset + alpha_offset + or];
byte g = imgData.data[offset + alpha_offset + og];
byte b = imgData.data[offset + alpha_offset + ob];
// GdkPixbuf expects RGBA format
srcData[new_offset + db] = b;
srcData[new_offset + dg] = g;
srcData[new_offset + dr] = r;
srcData[new_offset + da] = a;
}
}
} else {
for (int y = 0, offset = 0, new_offset = 0; y < height; y++) {
for (int x = 0; x < width; x++, offset += n_channels, new_offset += bytes_per_pixel) {
byte r = imgData.data[offset + alpha_offset + or];
byte g = imgData.data[offset + alpha_offset + og];
byte b = imgData.data[offset + alpha_offset + ob];
byte a = (byte) 255;
srcData[new_offset + db] = b;
srcData[new_offset + dg] = g;
srcData[new_offset + dr] = r;
srcData[new_offset + da] = a;
}
}
}
// Get GdkPixbuf from pixel data buffer
long buffer_ptr = OS.g_malloc(srcData.length);
C.memmove(buffer_ptr, srcData, srcData.length);
int rowstride = srcData.length / height;
// We use alpha in all cases, if no alpha is provided then it's just 255
long pixbuf = GDK.gdk_pixbuf_new_from_data (buffer_ptr, colorspace, true, 8, width, height, rowstride, 0, 0);
if (pixbuf == 0) {
OS.g_free(buffer_ptr);
SWT.error(SWT.ERROR_NULL_ARGUMENT);
}
// Write pixbuf to byte array and then to OutputStream
String typeStr = "";
switch (format) {
case SWT.IMAGE_BMP_RLE: typeStr = "bmp"; break;
case SWT.IMAGE_BMP: typeStr = "bmp"; break;
case SWT.IMAGE_GIF: typeStr = "gif"; break;
case SWT.IMAGE_ICO: typeStr = "ico"; break;
case SWT.IMAGE_JPEG: typeStr = "jpeg"; break;
case SWT.IMAGE_PNG: typeStr = "png"; break;
case SWT.IMAGE_TIFF: typeStr = "tiff"; break;
case SWT.IMAGE_SVG: typeStr = "svg"; break;
}
byte [] type = Converter.wcsToMbcs(typeStr, true);
long [] buffer = new long [1];
if (type == null || typeStr == "") {
OS.g_free(buffer_ptr);
SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT);
}
long [] len = new long [1];
GDK.gdk_pixbuf_save_to_bufferv(pixbuf, buffer, len, type, null, null, null);
byte[] byteArray = new byte[(int) len[0]];
C.memmove(byteArray, buffer[0], byteArray.length);
try {
stream.write(byteArray);
} catch (IOException e) {
OS.g_free(buffer_ptr);
SWT.error(SWT.ERROR_IO);
}
// must free buffer_ptr last otherwise we get half/corrupted image
OS.g_free(buffer_ptr);
}
/**
* Saves the image data in this ImageLoader to a file with the specified name.
* The format parameter can have one of the following values:
*
* IMAGE_BMP
* - Windows BMP file format, no compression
* IMAGE_BMP_RLE
* - Windows BMP file format, RLE compression if appropriate
* IMAGE_GIF
* - GIF file format
* IMAGE_ICO
* - Windows ICO file format
* IMAGE_JPEG
* - JPEG file format
* IMAGE_PNG
* - PNG file format
*
*
* @param filename the name of the file to write the images to
* @param format the format to write the images in
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the file name is null
*
* @exception SWTException
* - ERROR_IO - if an IO error occurs while writing to the file
* - ERROR_INVALID_IMAGE - if the image data contains invalid data
* - ERROR_UNSUPPORTED_FORMAT - if the image data cannot be saved to the requested format
*
*/
public void save(String filename, int format) {
if (filename == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
OutputStream stream = null;
try {
stream = new FileOutputStream(filename);
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
save(stream, format);
try {
stream.close();
} catch (IOException e) {
}
}
/**
* Adds the listener to the collection of listeners who will be
* notified when image data is either partially or completely loaded.
*
* An ImageLoaderListener should be added before invoking
* one of the receiver's load methods. The listener's
* imageDataLoaded
method is called when image
* data has been partially loaded, as is supported by interlaced
* GIF/PNG or progressive JPEG images.
*
* @param listener the listener which should be notified
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the listener is null
*
*
* @see ImageLoaderListener
* @see ImageLoaderEvent
*/
public void addImageLoaderListener(ImageLoaderListener listener) {
if (listener == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
if (imageLoaderListeners == null) {
imageLoaderListeners = new ArrayList<>();
}
imageLoaderListeners.add(listener);
}
/**
* Removes the listener from the collection of listeners who will be
* notified when image data is either partially or completely loaded.
*
* @param listener the listener which should no longer be notified
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the listener is null
*
*
* @see #addImageLoaderListener(ImageLoaderListener)
*/
public void removeImageLoaderListener(ImageLoaderListener listener) {
if (listener == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
if (imageLoaderListeners == null) return;
imageLoaderListeners.remove(listener);
}
/**
* Returns true
if the receiver has image loader
* listeners, and false
otherwise.
*
* @return true
if there are ImageLoaderListener
s, and false
otherwise
*
* @see #addImageLoaderListener(ImageLoaderListener)
* @see #removeImageLoaderListener(ImageLoaderListener)
*/
public boolean hasListeners() {
return imageLoaderListeners != null && imageLoaderListeners.size() > 0;
}
/**
* Notifies all image loader listeners that an image loader event
* has occurred. Pass the specified event object to each listener.
*
* @param event the ImageLoaderEvent
to send to each ImageLoaderListener
*/
public void notifyListeners(ImageLoaderEvent event) {
if (!hasListeners()) return;
int size = imageLoaderListeners.size();
for (int i = 0; i < size; i++) {
ImageLoaderListener listener = imageLoaderListeners.get(i);
listener.imageDataLoaded(event);
}
}
}