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/* ====================================================================
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==================================================================== */
package org.apache.poi.sl.draw;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Paint;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import org.apache.poi.sl.usermodel.PictureData;
import org.apache.poi.sl.usermodel.PictureShape;
import org.apache.poi.sl.usermodel.RectAlign;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
public class DrawPictureShape extends DrawSimpleShape {
private static final POILogger LOG = POILogFactory.getLogger(DrawPictureShape.class);
private static final String[] KNOWN_RENDERER = {
"org.apache.poi.hwmf.draw.HwmfImageRenderer",
"org.apache.poi.hemf.draw.HemfImageRenderer",
"org.apache.poi.xslf.draw.SVGImageRenderer"
};
public DrawPictureShape(PictureShape shape) {
super(shape);
}
@Override
public void drawContent(Graphics2D graphics) {
PictureShape ps = getShape();
Rectangle2D anchor = getAnchor(graphics, ps);
Insets insets = ps.getClipping();
PictureData[] pics = { ps.getAlternativePictureData(), ps.getPictureData() };
for (PictureData data : pics) {
if (data == null) {
continue;
}
try {
String ct = data.getContentType();
ImageRenderer renderer = getImageRenderer(graphics, ct);
if (renderer.canRender(ct)) {
renderer.loadImage(data.getData(), ct);
renderer.drawImage(graphics, anchor, insets);
return;
}
} catch (IOException e) {
LOG.log(POILogger.ERROR, "image can't be loaded/rendered.", e);
}
}
}
/**
* Returns an ImageRenderer for the PictureData
*
* @param graphics the graphics context
* @return the image renderer
*/
@SuppressWarnings({"unchecked"})
public static ImageRenderer getImageRenderer(Graphics2D graphics, String contentType) {
final ImageRenderer renderer = (graphics != null) ? (ImageRenderer)graphics.getRenderingHint(Drawable.IMAGE_RENDERER) : null;
if (renderer != null && renderer.canRender(contentType)) {
return renderer;
}
// first try with our default image renderer
final BitmapImageRenderer bir = new BitmapImageRenderer();
if (bir.canRender(contentType)) {
return bir;
}
// then iterate through the scratchpad renderers
//
// this could be nicely implemented via a j.u.ServiceLoader, but OSGi makes things complicated ...
// https://blog.osgi.org/2013/02/javautilserviceloader-in-osgi.html
// ... therefore falling back to classloading attempts
ClassLoader cl = ImageRenderer.class.getClassLoader();
for (String kr : KNOWN_RENDERER) {
final ImageRenderer ir;
try {
ir = ((Class)cl.loadClass(kr)).newInstance();
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException e) {
// scratchpad was not on the path, ignore and continue
LOG.log(POILogger.INFO, "Known image renderer '"+kr+" not found/loaded - include poi-scratchpad jar!", e);
continue;
}
if (ir.canRender(contentType)) {
return ir;
}
}
LOG.log(POILogger.WARN, "No suiteable image renderer found for content-type '"+
contentType+"' - include poi-scratchpad jar!");
// falling back to BitmapImageRenderer, at least it gracefully handles invalid images
return bir;
}
@Override
protected Paint getFillPaint(Graphics2D graphics) {
return null;
}
@Override
protected PictureShape getShape() {
return (PictureShape)shape;
}
/**
* Resize this picture to the default size.
*
* For PNG and JPEG resizes the image to 100%,
* for other types, if the size can't be determined it will be 200x200 pixels.
*/
public void resize() {
PictureShape ps = getShape();
Dimension dim = ps.getPictureData().getImageDimension();
Rectangle2D origRect = ps.getAnchor();
double x = origRect.getX();
double y = origRect.getY();
double w = dim.getWidth();
double h = dim.getHeight();
ps.setAnchor(new Rectangle2D.Double(x, y, w, h));
}
/**
* Fit picture shape into the target rectangle, maintaining the aspect ratio
* and repositioning within the target rectangle with a centered alignment.
*
* @param target The target rectangle
*/
public void resize(Rectangle2D target) {
resize(target, RectAlign.CENTER);
}
/**
* Fit picture shape into the target rectangle, maintaining the aspect ratio
* and repositioning within the target rectangle based on the specified
* alignment (gravity).
*
* @param target The target rectangle
* @param align
* The alignment within the target rectangle when resizing.
* A null value corresponds to RectAlign.CENTER
*/
public void resize(Rectangle2D target, RectAlign align) {
PictureShape ps = getShape();
Dimension dim = ps.getPictureData().getImageDimension();
if (dim.width <= 0 || dim.height <= 0) {
// nothing useful to be done for this case
ps.setAnchor(target);
return;
}
double w = target.getWidth();
double h = target.getHeight();
// scaling
double sx = w / dim.width;
double sy = h / dim.height;
// position adjustments
double dx = 0, dy = 0;
if (sx > sy) {
// use y-scaling for both, reposition x accordingly
w = sy * dim.width;
dx = target.getWidth() - w;
} else if (sy > sx) {
// use x-scaling for both, reposition y accordingly
h = sx * dim.height;
dy = target.getHeight() - h;
} else {
// uniform scaling, can use target values directly
ps.setAnchor(target);
return;
}
// the positioning
double x = target.getX();
double y = target.getY();
switch (align) {
case TOP: // X=balance, Y=ok
x += dx/2;
break;
case TOP_RIGHT: // X=shift, Y=ok
x += dx;
break;
case RIGHT: // X=shift, Y=balance
x += dx;
y += dy/2;
break;
case BOTTOM_RIGHT: // X=shift, Y=shift
x += dx;
y += dy;
break;
case BOTTOM: // X=balance, Y=shift
x += dx/2;
y += dy;
break;
case BOTTOM_LEFT: // X=ok, Y=shift
y += dy;
break;
case LEFT: // X=ok, Y=balance
y += dy/2;
break;
case TOP_LEFT: // X=ok, Y=ok
/* no-op */
break;
default: // CENTER: X=balance, Y=balance
x += dx/2;
y += dy/2;
break;
}
ps.setAnchor(new Rectangle2D.Double(x, y, w, h));
}
}