Skia ~ Canvas ~ Bitmap

Question: How to Use setdibitstodevice (HDC, destx, desty, width, height, srcx, srcy, startscan, scanlines, startbit, lpbmi, colormode ); different drawings on the canvas are reflected on the DC.

The new canvas (Bitmap) was tested last time, but the bitmap must be an existing bitmap and initialized. Now the question is, how can we remove this background and directly respond to others. That is, the internal value assignment of Bitmap.

Through a painting skia class in the House, it is found that a bitmap is directly defined, and there is no internal value assignment, that is, a null value. This involves internal initialization operations. It also involves the canvas size, layout, adjustment, and other settings.

 

See the implementation in skwindow. h.