/*******************************************************************************
* Copyright (c) 2000, 2007 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.ui.internal.decorators;
import org.eclipse.swt.graphics.Device;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.PaletteData;
import org.eclipse.swt.graphics.RGB;
/**
* DecorationImageBuilder is a utility class for merging images without data
* loss.
*
* @since 3.3
*
*/
class DecorationImageBuilder {
private static final int TOP_LEFT = LightweightDecoratorDefinition.TOP_LEFT;
private static final int TOP_RIGHT = LightweightDecoratorDefinition.TOP_RIGHT;
private static final int BOTTOM_LEFT = LightweightDecoratorDefinition.BOTTOM_LEFT;
private static final int BOTTOM_RIGHT = LightweightDecoratorDefinition.BOTTOM_RIGHT;
private static final int UNDERLAY = LightweightDecoratorDefinition.UNDERLAY;
private static final PaletteData ALPHA_PALETTE, BW_PALETTE;
static {
RGB[] rgbs = new RGB[256];
for (int i = 0; i < rgbs.length; i++) {
rgbs[i] = new RGB(i, i, i);
}
ALPHA_PALETTE = new PaletteData(rgbs);
BW_PALETTE = new PaletteData(new RGB[] { new RGB(0, 0, 0),
new RGB(255, 255, 255) });
}
private static int getTransparencyDepth(ImageData data) {
if (data.maskData != null && data.depth == 32) {
for (int i = 0; i < data.data.length; i += 4) {
if (data.data[i] != 0)
return 8;
}
}
if (data.maskData != null || data.transparentPixel != -1)
return 1;
if (data.alpha != -1 || data.alphaData != null)
return 8;
return 0;
}
private static ImageData getTransparency(ImageData data,
int transparencyDepth) {
if (data == null)
return null;
if (transparencyDepth == 1)
return data.getTransparencyMask();
ImageData mask = null;
if (data.maskData != null && data.depth == 32) {
ImageData m = data.getTransparencyMask();
mask = new ImageData(data.width, data.height, 8, ALPHA_PALETTE,
data.width, new byte[data.width * data.height]);
for (int y = 0; y < data.height; y++) {
for (int x = 0; x < data.width; x++) {
int alpha = data.getPixel(x, y) & 0xFF;
if (alpha == 0) {
if (m.getPixel(x, y) != 0)
alpha = 255;
}
mask.setPixel(x, y, alpha);
}
}
} else if (data.maskData != null || data.transparentPixel != -1) {
ImageData m = data.getTransparencyMask();
mask = new ImageData(data.width, data.height, 8, ALPHA_PALETTE,
data.width, new byte[data.width * data.height]);
for (int y = 0; y < mask.height; y++) {
for (int x = 0; x < mask.width; x++) {
mask.setPixel(x, y, m.getPixel(x, y) != 0 ? (byte) 255 : 0);
}
}
} else if (data.alpha != -1) {
mask = new ImageData(data.width, data.height, 8, ALPHA_PALETTE,
data.width, new byte[data.width * data.height]);
for (int i = 0; i < mask.data.length; i++) {
mask.data[i] = (byte) data.alpha;
}
} else if (data.alphaData != null) {
mask = new ImageData(data.width, data.height, 8, ALPHA_PALETTE,
data.width, data.alphaData);
} else {
mask = new ImageData(data.width, data.height, 8, ALPHA_PALETTE,
data.width, new byte[data.width * data.height]);
for (int i = 0; i < mask.data.length; i++) {
mask.data[i] = (byte) 255;
}
}
return mask;
}
private static void composite(ImageData dst, ImageData src, int xOffset,
int yOffset) {
if (dst.depth == 1) {
for (int y = 0, dstY = y + yOffset; y < src.height; y++, dstY++) {
for (int x = 0, dstX = x + xOffset; x < src.width; x++, dstX++) {
if (0 <= dstX && dstX < dst.width && 0 <= dstY
&& dstY < dst.height) {
if (src.getPixel(x, y) != 0) {
dst.setPixel(dstX, dstY, 1);
}
}
}
}
} else if (dst.depth == 8) {
for (int y = 0, dstY = y + yOffset; y < src.height; y++, dstY++) {
for (int x = 0, dstX = x + xOffset; x < src.width; x++, dstX++) {
if (0 <= dstX && dstX < dst.width && 0 <= dstY
&& dstY < dst.height) {
int srcAlpha = src.getPixel(x, y);
int dstAlpha = dst.getPixel(dstX, dstY);
dstAlpha += (srcAlpha - dstAlpha) * srcAlpha / 255;
dst.setPixel(dstX, dstY, dstAlpha);
}
}
}
}
}
/**
* Create a composite image by underlaying and overlaying the base image.
* @param device
* @param base
* @param overlay
* @return Image
*/
static Image compositeImage(Device device, ImageData base,
ImageData[] overlay) {
if (base == null)
return null;
Image image = new Image(device, new ImageData(base.width, base.height,
24, new PaletteData(0xff, 0xff00, 0xff00000)));
GC gc = new GC(image);
ImageData src;
int maskDepth = 0, baseMaskDepth = 0;
ImageData underlay = src = overlay.length > UNDERLAY ? overlay[UNDERLAY]
: null;
if (src != null) {
maskDepth = Math.max(maskDepth, getTransparencyDepth(src));
Image img = new Image(device, src);
gc.drawImage(img, 0, 0);
img.dispose();
}
src = base;
if (base != null) {
maskDepth = Math.max(maskDepth,
baseMaskDepth = getTransparencyDepth(src));
Image img = new Image(device, src);
gc.drawImage(img, 0, 0);
img.dispose();
}
ImageData topLeft = src = overlay[TOP_LEFT];
if (src != null) {
maskDepth = Math.max(maskDepth, getTransparencyDepth(src));
Image img = new Image(device, src);
gc.drawImage(img, 0, 0);
img.dispose();
}
ImageData topRight = src = overlay[TOP_RIGHT];
if (src != null) {
maskDepth = Math.max(maskDepth, getTransparencyDepth(src));
Image img = new Image(device, src);
gc.drawImage(img, base.width - src.width, 0);
img.dispose();
}
ImageData bottomLeft = src = overlay[BOTTOM_LEFT];
if (src != null) {
maskDepth = Math.max(maskDepth, getTransparencyDepth(src));
Image img = new Image(device, src);
gc.drawImage(img, 0, base.height - src.height);
img.dispose();
}
ImageData bottomRight = src = overlay[BOTTOM_RIGHT];
if (src != null) {
maskDepth = Math.max(maskDepth, getTransparencyDepth(src));
Image img = new Image(device, src);
gc.drawImage(img, base.width - src.width, base.height - src.height);
img.dispose();
}
gc.dispose();
if (baseMaskDepth > 0) {
ImageData newData = image.getImageData();
image.dispose();
ImageData mask = null;
switch (maskDepth) {
case 1:
mask = new ImageData(base.width, base.height, maskDepth,
BW_PALETTE);
break;
case 8:
mask = new ImageData(base.width, base.height, maskDepth,
ALPHA_PALETTE, base.width, new byte[base.width
* base.height]);
break;
}
src = getTransparency(underlay, maskDepth);
if (src != null)
composite(mask, src, 0, 0);
src = getTransparency(base, maskDepth);
if (src != null)
composite(mask, src, 0, 0);
src = getTransparency(topLeft, maskDepth);
if (src != null)
composite(mask, src, 0, 0);
src = getTransparency(topRight, maskDepth);
if (src != null)
composite(mask, src, mask.width - src.width, 0);
src = getTransparency(bottomLeft, maskDepth);
if (src != null)
composite(mask, src, 0, mask.height - src.height);
src = getTransparency(bottomRight, maskDepth);
if (src != null)
composite(mask, src, mask.width - src.width, mask.height
- src.height);
switch (maskDepth) {
case 1:
newData.maskData = mask.data;
newData.maskPad = mask.scanlinePad;
break;
case 8:
newData.alphaData = mask.data;
break;
}
image = new Image(device, newData);
}
return image;
}
}