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win32-printing: check if images are opaque

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Don't use fallback for argb32 images with all alpha == 255.
This commit is contained in:
Adrian Johnson 2007-10-21 23:42:22 +09:30
parent 9eb5747755
commit c8da2a7ded
1 changed files with 57 additions and 0 deletions
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57
src/cairo-win32-printing-surface.c
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@ -94,6 +94,57 @@ _cairo_win32_printing_surface_init_ps_mode (cairo_win32_surface_t *surface)
surface->flags |= CAIRO_WIN32_SURFACE_CAN_RECT_GRADIENT;
}
static cairo_int_status_t
analyze_surface_pattern_transparency (cairo_surface_pattern_t *pattern)
{
cairo_image_surface_t *image;
void *image_extra;
cairo_int_status_t status;
int x, y;
status = _cairo_surface_acquire_source_image (pattern->surface,
&image,
&image_extra);
if (status)
return status;
if (image->base.status)
return image->base.status;
if (image->format == CAIRO_FORMAT_RGB24) {
status = CAIRO_STATUS_SUCCESS;
goto RELEASE_SOURCE;
}
if (image->format != CAIRO_FORMAT_ARGB32) {
/* If the surface does not support the image format, assume
* that it does have alpha. The image will be converted to
* rgb24 when the surface blends the image into the page
* color to remove the transparency. */
status = CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY;
goto RELEASE_SOURCE;
}
for (y = 0; y < image->height; y++) {
int a;
uint32_t *pixel = (uint32_t *) (image->data + y * image->stride);
for (x = 0; x < image->width; x++, pixel++) {
a = (*pixel & 0xff000000) >> 24;
if (a != 255) {
status = CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY;
goto RELEASE_SOURCE;
}
}
}
status = CAIRO_STATUS_SUCCESS;
RELEASE_SOURCE:
_cairo_surface_release_source_image (pattern->surface, image, image_extra);
return status;
}
static cairo_bool_t
surface_pattern_supported (const cairo_surface_pattern_t *pattern)
{
@ -163,6 +214,12 @@ _cairo_win32_printing_surface_analyze_operation (cairo_win32_surface_t *surface,
* background to convert the pattern to opaque.
*/
if (pattern->type == CAIRO_PATTERN_TYPE_SURFACE) {
cairo_surface_pattern_t *surface_pattern = (cairo_surface_pattern_t *) pattern;
return analyze_surface_pattern_transparency (surface_pattern);
}
if (_cairo_pattern_is_opaque (pattern))
return CAIRO_STATUS_SUCCESS;
else