public static final String toDataURL(ImageElement element, DataURLType mimetype, double quality) {
if (null == mimetype) {
mimetype = DataURLType.PNG;
}
ScratchCanvas canvas = new ScratchCanvas(element.getWidth(), element.getHeight());
canvas.getContext().drawImage(element, 0, 0, element.getWidth(), element.getHeight());
return canvas.toDataURL(mimetype, quality);
}
public static final String toDataURL(final ImageElement element) {
final ScratchCanvas canvas = new ScratchCanvas(element.getWidth(), element.getHeight());
canvas.getContext().drawImage(element, 0, 0);
return canvas.toDataURL();
}
@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;
}
}
/**
* Draws an input image at a given position on the canvas. Resizes image according to specified
* width and height.
*
* <p>We recommend that the pixel and coordinate spaces be the same to provide consistent
* positioning and scaling results
*
* @param img The image to be drawn
* @param offsetX x coord of the top left corner in the destination space
* @param offsetY y coord of the top left corner in the destination space
* @param width the size of the image in the destination space
* @param height the size of the image in the destination space
*/
public void drawImage(
ImageElement img, double offsetX, double offsetY, double width, double height) {
impl.drawImage(img, 0, 0, img.getWidth(), img.getHeight(), offsetX, offsetY, width, height);
}
/**
* Draws an input image to a specified position on the canvas. Size defaults to the default
* dimensions of the image.
*
* @param img the image to be drawn
* @param offsetX x coord of the top left corner in the destination space
* @param offsetY y coord of the top left corner in the destination space
*/
public void drawImage(ImageElement img, double offsetX, double offsetY) {
drawImage(img, offsetX, offsetY, img.getWidth(), img.getHeight());
}
@Override
public float height() {
return img == null ? 0 : scale.invScaled(img.getHeight());
}
