diff options
| -rw-r--r-- | webp.c | 23 |
1 files changed, 23 insertions, 0 deletions
@@ -54,6 +54,29 @@ webp_load(FILE *fp, const char *path) format = PIXMAN_x8b8g8r8; stride = stride_for_format_and_width(format, width); + for (uint32_t *abgr = (uint32_t *)image_data; + abgr < (uint32_t *)(image_data + (size_t)width * (size_t)height * 4); + abgr++) { + uint8_t alpha = (*abgr >> 24) & 0xff; + uint8_t red = (*abgr >> 16) & 0xff; + uint8_t green = (*abgr >> 8) & 0xff; + uint8_t blue = (*abgr >> 0) & 0xff; + + if (alpha == 0xff) + continue; + + if (alpha == 0x00) + blue = green = red = 0x00; + else { + blue = blue * alpha / 0xff; + green = green * alpha / 0xff; + red = red * alpha / 0xff; + } + + *abgr = (uint32_t)alpha << 24 | red << 16 | green << 8 | blue; + } + + ok = NULL != (pix = pixman_image_create_bits_no_clear( format, width, height, (uint32_t *)image_data, stride)); |