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[image] Make _cairo_image_analayze_transparency() more format agnostic

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Use the content in preference to the format to determine
CAIRO_IMAGE_IS_OPAQUE/CAIRO_IMAGE_HAS_ALPHA.
This commit is contained in:
Chris Wilson 2009-04-24 10:14:36 +01:00
parent 4be6de9fc6
commit aac132a76a
1 changed files with 7 additions and 10 deletions
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17
src/cairo-image-surface.c
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@ -1576,15 +1576,13 @@ _cairo_image_analyze_transparency (cairo_image_surface_t *image)
if (image->transparency != CAIRO_IMAGE_UNKNOWN)
return image->transparency;
if (image->format == CAIRO_FORMAT_RGB24) {
image->transparency = CAIRO_IMAGE_IS_OPAQUE;
return CAIRO_IMAGE_IS_OPAQUE;
}
if ((image->base.content & CAIRO_CONTENT_ALPHA) == 0)
return image->transparency = CAIRO_IMAGE_IS_OPAQUE;
if ((image->base.content & CAIRO_CONTENT_COLOR) == 0)
return image->transparency = CAIRO_IMAGE_HAS_ALPHA;
if (image->format != CAIRO_FORMAT_ARGB32) {
image->transparency = CAIRO_IMAGE_HAS_ALPHA;
return CAIRO_IMAGE_HAS_ALPHA;
}
if (image->format != CAIRO_FORMAT_ARGB32)
return image->transparency = CAIRO_IMAGE_HAS_ALPHA;
image->transparency = CAIRO_IMAGE_IS_OPAQUE;
for (y = 0; y < image->height; y++) {
@ -1593,8 +1591,7 @@ _cairo_image_analyze_transparency (cairo_image_surface_t *image)
for (x = 0; x < image->width; x++, pixel++) {
int a = (*pixel & 0xff000000) >> 24;
if (a > 0 && a < 255) {
image->transparency = CAIRO_IMAGE_HAS_ALPHA;
return CAIRO_IMAGE_HAS_ALPHA;
return image->transparency = CAIRO_IMAGE_HAS_ALPHA;
} else if (a == 0) {
image->transparency = CAIRO_IMAGE_HAS_BILEVEL_ALPHA;
}