@Override
public void getRgb(
int startX, int startY, int width, int height, int[] rgbArray, int offset, int scanSize) {
Asserts.checkState(isReady(), "Cannot getRgb() a non-ready image");
if (canvas == null) {
canvas = img.getOwnerDocument().createCanvasElement();
canvas.setHeight(img.getHeight());
canvas.setWidth(img.getWidth());
canvas.getContext2d().drawImage(img, 0, 0);
// img.getOwnerDocument().getBody().appendChild(canvas);
}
Context2d ctx = canvas.getContext2d();
ImageData imageData = ctx.getImageData(startX, startY, width, height);
CanvasPixelArray pixelData = imageData.getData();
int i = 0;
int dst = offset;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
int r = pixelData.get(i++);
int g = pixelData.get(i++);
int b = pixelData.get(i++);
int a = pixelData.get(i++);
rgbArray[dst + x] = a << 24 | r << 16 | g << 8 | b;
}
dst += scanSize;
}
}
@Override
public Pattern toPattern() {
Asserts.checkState(isReady(), "Cannot generate a pattern from unready image.");
Rectangle2D rect = new Rectangle2D.Float(0, 0, width(), height());
return new JavaPattern(this, new TexturePaint(img, rect));
}
@Override
protected void updateTexture(int tex) {
Asserts.checkState(img != null);
((JavaGLContext) ctx).updateTexture(tex, img);
}
@Override
public Surface restore() {
Asserts.checkState(transformStack.size() > 1, "Unbalanced save/restore");
transformStack.remove(transformStack.size() - 1);
return this;
}
@Override
public Pattern toPattern() {
Asserts.checkState(isReady(), "Cannot toPattern() a non-ready image");
return new HtmlPattern(this, repeatX, repeatY);
}