diff options
Diffstat (limited to 'desktop/bitmap.c')
| -rw-r--r-- | desktop/bitmap.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/desktop/bitmap.c b/desktop/bitmap.c index 48065d080..3e8529a54 100644 --- a/desktop/bitmap.c +++ b/desktop/bitmap.c @@ -44,3 +44,36 @@ void bitmap_set_format(const bitmap_fmt_t *bitmap_format) bitmap_fmt.layout = bitmap_sanitise_bitmap_layout(bitmap_fmt.layout); bitmap_layout = bitmap__get_colour_layout(&bitmap_fmt); } + +/* Exported function, documented in desktop/bitmap.h */ +void bitmap_format_convert(void *bitmap, + const bitmap_fmt_t *fmt_from, + const bitmap_fmt_t *fmt_to) +{ + int width = guit->bitmap->get_width(bitmap); + int height = guit->bitmap->get_height(bitmap); + uint8_t *buffer = guit->bitmap->get_buffer(bitmap); + size_t rowstride = guit->bitmap->get_rowstride(bitmap); + struct bitmap_colour_layout to = bitmap__get_colour_layout(fmt_to); + struct bitmap_colour_layout from = bitmap__get_colour_layout(fmt_from); + + NSLOG(netsurf, DEEPDEBUG, "Bitmap format conversion (%u --> %u)", + fmt_from->layout, fmt_to->layout); + + for (int y = 0; y < height; y++) { + uint8_t *row = buffer; + + for (int x = 0; x < width; x++) { + const uint32_t px = *((uint32_t *)(void *) row); + + row[to.r] = ((const uint8_t *) &px)[from.r]; + row[to.g] = ((const uint8_t *) &px)[from.g]; + row[to.b] = ((const uint8_t *) &px)[from.b]; + row[to.a] = ((const uint8_t *) &px)[from.a]; + + row += sizeof(uint32_t); + } + + buffer += rowstride; + } +} |