return bytes;
}
-#ifdef HAVE_LIBPNG
-
-static void
-pngify_pixels (uint32_t *pixels, int n_pixels)
+void
+a8r8g8b8_to_rgba_np (uint32_t *dst, uint32_t *src, int n_pixels)
{
+ uint8_t *dst8 = (uint8_t *)dst;
int i;
for (i = 0; i < n_pixels; ++i)
{
- uint32_t p = pixels[i];
- uint8_t *out = (uint8_t *)&(pixels[i]);
+ uint32_t p = src[i];
uint8_t a, r, g, b;
a = (p & 0xff000000) >> 24;
b = (b * 255) / a;
}
- *out++ = r;
- *out++ = g;
- *out++ = b;
- *out++ = a;
+ *dst8++ = r;
+ *dst8++ = g;
+ *dst8++ = b;
+ *dst8++ = a;
}
}
+#ifdef HAVE_LIBPNG
+
pixman_bool_t
write_png (pixman_image_t *image, const char *filename)
{
pixman_image_composite32 (
PIXMAN_OP_SRC, image, NULL, copy, 0, 0, 0, 0, 0, 0, width, height);
- pngify_pixels (data, height * width);
+ a8r8g8b8_to_rgba_np (data, data, height * width);
for (i = 0; i < height; ++i)
row_pointers[i] = (png_bytep)(data + i * width);
/* If possible, enable traps for floating point exceptions */
void enable_fp_exceptions(void);
+/* Converts a8r8g8b8 pixels to pixels that
+ * - are not premultiplied,
+ * - are stored in this order in memory: R, G, B, A, regardless of
+ * the endianness of the computer.
+ * It is allowed for @src and @dst to point to the same memory buffer.
+ */
+void
+a8r8g8b8_to_rgba_np (uint32_t *dst, uint32_t *src, int n_pixels);
+
pixman_bool_t
write_png (pixman_image_t *image, const char *filename);