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-= Pixman accelerated Rendering =
-
-Several people recommended using pixman for 2D blitting to improve performance
-as pixman has assembler-accelerated backends. However, pixman does not provide
-the functions we need.
-Most rendering operations we need, do alpha compositing with a foreground and
-background color. With pixman we would have to do something like:
-
-	pixman_image_t *pdst = pixman_image_create_bits(
-				PIXMAN_x8r8g8b8,
-				width,
-				height,
-				(uint32_t*)dst,
-				rb->stride);
-	pixman_image_t *pmsk = pixman_image_create_bits(
-				PIXMAN_a8,
-				width,
-				height,
-				(uint32_t*)src,
-				req->buf->stride);
-
-	pixman_color_t fcol = { 0xffff, 0xffff, 0xffff, 0xffff };
-	pixman_image_t *psrc = pixman_image_create_solid_fill(
-				&fcol);
-
-	uint32_t bcol = (req->br << 16) | (req->bg << 8) | req->bb;
-	pixman_fill((void*)dst, rb->stride / 4, 32, 0, 0,
-			width, height, bcol);
-
-	pixman_image_composite(PIXMAN_OP_OVER,
-			       psrc, pmsk, pdst,
-			       0, 0, 0, 0, 0, 0,
-			       width, height);
-
-That is, we create pixman-images for the destination and the mask. We could
-save them in the video-display and glyph objects so there is actually no need
-to allocate them dynamically. However, the solid color object can be any RGB
-value and thus it must be allocated for every blit. This is way too heavy and
-pixman should really provide a way to create solid images easier. Preferably
-without any function call.
-But the bigger problem is actually that we have to copy data twice. We need to
-first call pixman_fill() and then pixman_image_composite() to get the
-behavior we want. This totally kills performance.
-
-Profiling pixman_image_composite(), we see that it definitely is better than
-our unoptimized blitters, but we need to add a function which does both
-operations at once to pixman to get a decent performance.