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Use GL_ONE for the source in glBendFunc instead of pre-unmultiplying.

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Eventually we need to allow both pre-multiplied alpha and not, but for now default to premultiplied.
This commit is contained in:
Kristian Høgsberg 2008-11-03 06:35:46 -05:00
parent 61017b190a
commit 3f59e82c20
4 changed files with 3 additions and 91 deletions
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30
flower.c
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@ -18,34 +18,6 @@
static const char gem_device[] = "/dev/dri/card0";
static const char socket_name[] = "\0wayland";
static void
unpremultiply_data(uint8_t *data, int width, int height, int stride)
{
unsigned int i, j;
uint8_t *row;
for (j = 0; j < height; j++) {
row = data + j * stride;
for (i = 0; i < width; i++) {
uint8_t *b = &row[i * 4];
uint32_t pixel;
uint8_t alpha;
memcpy (&pixel, b, sizeof (uint32_t));
alpha = (pixel & 0xff000000) >> 24;
if (alpha == 0) {
b[0] = b[1] = b[2] = b[3] = 0;
} else {
b[0] = (((pixel & 0xff0000) >> 16) * 255 + alpha / 2) / alpha;
b[1] = (((pixel & 0x00ff00) >> 8) * 255 + alpha / 2) / alpha;
b[2] = (((pixel & 0x0000ff) >> 0) * 255 + alpha / 2) / alpha;
b[3] = alpha;
}
}
}
}
static uint32_t name_cairo_surface(int fd, cairo_surface_t *surface)
{
struct drm_i915_gem_create create;
@ -59,8 +31,6 @@ static uint32_t name_cairo_surface(int fd, cairo_surface_t *surface)
stride = cairo_image_surface_get_stride(surface);
data = cairo_image_surface_get_data(surface);
unpremultiply_data(data, width, height, stride);
memset(&create, 0, sizeof(create));
create.size = height * stride;