I need to draw text on a transparent image with format ARGB, pre-multiplied
alpha.
The rendered FT_Bitmap has format FT_PIXEL_MODE_LCD and I want the glyph to be
displayed in some color with transparency.
So, for every pixel I have 3 numbers:
Da, Dr, Dg, Db - destination pixel ARGB (the background image).
Fr, Fg, Fb - FreeType rendered pixel (FT_Bitmap rendered with
FT_RENDER_MODE_LCD)
Ca, Cr, Cg, Cb - The color I want the glyph to be drawn.
So, the question: How to properly combine these 3 numbers in order to get the
result bitmap pixel.
A theory and math are welcome. If I understand the theory, I can write the code.
Best Regards.
--
http://fresh.flatassembler.net
http://asm32.info
John Found <[email protected]>
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