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PDF: Add support for CAIRO_FORMAT_A8 images

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This commit is contained in:
Adrian Johnson 2007-09-20 22:51:39 +09:30
parent 8a4adcf5f3
commit 12b2ab630c
1 changed files with 31 additions and 11 deletions
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42
src/cairo-pdf-surface.c
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@ -1159,13 +1159,15 @@ _cairo_pdf_surface_emit_smask (cairo_pdf_surface_t *surface,
cairo_status_t status = CAIRO_STATUS_SUCCESS;
char *alpha, *alpha_compressed;
unsigned long alpha_size, alpha_compressed_size;
uint32_t *pixel;
uint32_t *pixel32;
uint8_t *pixel8;
int i, x, y;
cairo_bool_t opaque;
uint8_t a;
/* This is the only image format we support, which simplfies things. */
assert (image->format == CAIRO_FORMAT_ARGB32);
assert (image->format == CAIRO_FORMAT_ARGB32 ||
image->format == CAIRO_FORMAT_A8 );
alpha_size = image->height * image->width;
alpha = malloc (alpha_size);
@ -1177,13 +1179,24 @@ _cairo_pdf_surface_emit_smask (cairo_pdf_surface_t *surface,
opaque = TRUE;
i = 0;
for (y = 0; y < image->height; y++) {
pixel = (uint32_t *) (image->data + y * image->stride);
if (image->format == CAIRO_FORMAT_ARGB32) {
pixel32 = (uint32_t *) (image->data + y * image->stride);
for (x = 0; x < image->width; x++, pixel++) {
a = (*pixel & 0xff000000) >> 24;
alpha[i++] = a;
if (a != 0xff)
opaque = FALSE;
for (x = 0; x < image->width; x++, pixel32++) {
a = (*pixel32 & 0xff000000) >> 24;
alpha[i++] = a;
if (a != 0xff)
opaque = FALSE;
}
} else {
pixel8 = (uint8_t *) (image->data + y * image->stride);
for (x = 0; x < image->width; x++, pixel8++) {
a = *pixel8;
alpha[i++] = a;
if (a != 0xff)
opaque = FALSE;
}
}
}
@ -1245,7 +1258,9 @@ _cairo_pdf_surface_emit_image (cairo_pdf_surface_t *surface,
* _cairo_pdf_surface_analyze_operation which only accept source surfaces of
* CONTENT_COLOR or CONTENT_COLOR_ALPHA.
*/
assert (image->format == CAIRO_FORMAT_RGB24 || image->format == CAIRO_FORMAT_ARGB32);
assert (image->format == CAIRO_FORMAT_RGB24 ||
image->format == CAIRO_FORMAT_ARGB32 ||
image->format == CAIRO_FORMAT_A8);
rgb_size = image->height * image->width * 3;
rgb = malloc (rgb_size);
@ -1276,10 +1291,14 @@ _cairo_pdf_surface_emit_image (cairo_pdf_surface_t *surface,
rgb[i++] = (((*pixel & 0x00ff00) >> 8) * 255 + a / 2) / a;
rgb[i++] = (((*pixel & 0x0000ff) >> 0) * 255 + a / 2) / a;
}
} else {
} else if (image->format == CAIRO_FORMAT_RGB24) {
rgb[i++] = (*pixel & 0x00ff0000) >> 16;
rgb[i++] = (*pixel & 0x0000ff00) >> 8;
rgb[i++] = (*pixel & 0x000000ff) >> 0;
} else {
rgb[i++] = 0;
rgb[i++] = 0;
rgb[i++] = 0;
}
}
}
@ -1291,7 +1310,8 @@ _cairo_pdf_surface_emit_image (cairo_pdf_surface_t *surface,
}
need_smask = FALSE;
if (image->format == CAIRO_FORMAT_ARGB32) {
if (image->format == CAIRO_FORMAT_ARGB32 ||
image->format == CAIRO_FORMAT_A8) {
status = _cairo_pdf_surface_emit_smask (surface, image, &smask);
if (status)
goto CLEANUP_COMPRESSED;