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Message #00002
Some canvas-related questions
Hello,
I enjoy being one of first 100 Duetto beta testers. Thanks for this
opportunity!
After reading header files in include/duetto, some question regarding
canvas have arisen:
1. HTMLCanvasElement and CanvasRenderingContext2D are defined both in
canvas.h and clientlib.h - what's the reason for that? Looks like
definitions in clientlib.h are far more complete. Should I use them and
not those in canvas.h?
2. CanvasRenderingContext2D::getImageData() always expects Object * as
its first argument. Given the name imageDataOrSw I suppose it's a way to
overload the method according to spec [1]: getImageData(double, double)
and getImageData(ImageData). How is it supposed to be called if I want
ImageData of given width and height? What are the reasons for not
overloading it in a 'straight' way:
ImageData * CanvasRenderingContext2D::getImageData(double, double)
ImageData * CanvasRenderingContext2D::getImageData(Imagedata *)?
3. What is the most idiomatic way to draw an existing PNG file on a
canvas? I've come up with different solutions, including using
createImageData()/putImageData() and [[server]] method returning bitmap
array; using drawImage() and [[server]] method returning image as data:
url; using drawImage() and HTTP backend to serve static for
HTMLImageElement. Which one should be preferred?
Thank you very much for the clarifications!
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Sincerely,
Valentine Sinitsyn