Gerd Hoffmann <[email protected]> writes: > Is there documentation somewhere describing what the pixman ops exactly do?
Unfortunately, pixman doesn't have as much documentation as it should. > Background: I'm trying to figure the best way to do font rendering with > pixman. Use case is the qemu vga text mode emulation. I have 4 pixman > images involved: > > (1) The (virtual) vga framebuffer, in PIXMAN_x8r8g8b8 > (2) The vgafont glyph, in PIXMAN_a8r8g8b8, > with 0xffffffff / 0x00000000 for font/background pixels. > (3) The foreground (font) color, created using > pixman_image_create_solid_fill() > (4) The background color, likewise created using > pixman_image_create_solid_fill() > > What I'm trying now is this: > > pixman_image_composite(PIXMAN_OP_SRC, bg, NULL, vgafb, ...); > pixman_image_composite(PIXMAN_OP_OVER, fg, glyph, vgafb, ...); > > So the first op fills with the background color, and the second renders > the character. Comes close to what I want. Except that the second > blends the foreground color with the background color instead of > replacing it. If I understand correctly, what you are doing now should work. Blending of the foreground and background colors should only happen if the foreground color has alpha != 0xff, or if a glyph pixel has alpha that is neither 0x00 nor 0xff. In either case, blending is presumably what you want? Søren _______________________________________________ Pixman mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/pixman
