Canvas and images
Drawing an image to a canvas 2d context
void drawImage(in HTMLImageElement image, in double dx, in double dy,
in optional double dw, in double dh);
void drawImage(in HTMLImageElement image, in double sx, in double sy,
in double sw, in double sh, in double dx, in double dy,
in double dw, in double dh);
Extracting an image from a canvas
var url = canvas.toDataURL(); /* returns a data: URL for a PNG */
Getting ImageData objects from a canvas 2d context
interface ImageData {
readonly attribute unsigned long width;
readonly attribute unsigned long height;
readonly attribute CanvasPixelArray data;
};
ImageData createImageData(in double sw, in double sh);
ImageData getImageData(in double sx, in double sy,
in double sw, in double sh);
Putting image data back in a canvas 2d context
void putImageData(in ImageData imagedata, in double dx, in double dy);
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