diff options
Diffstat (limited to 'gtk2_ardour/utils.cc')
| -rw-r--r-- | gtk2_ardour/utils.cc | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/gtk2_ardour/utils.cc b/gtk2_ardour/utils.cc index 9378b6727c..f5490c025a 100644 --- a/gtk2_ardour/utils.cc +++ b/gtk2_ardour/utils.cc @@ -824,3 +824,35 @@ possibly_translate_keyval_to_make_legal_accelerator (uint32_t& keyval) return false; } + +inline guint8 +convert_color_channel (guint8 src, + guint8 alpha) +{ + return alpha ? ((guint (src) << 8) - src) / alpha : 0; +} + +void +convert_bgra_to_rgba (guint8 const* src, + guint8* dst, + int width, + int height) +{ + guint8 const* src_pixel = src; + guint8* dst_pixel = dst; + + for (int y = 0; y < height; y++) + for (int x = 0; x < width; x++) + { + dst_pixel[0] = convert_color_channel (src_pixel[2], + src_pixel[3]); + dst_pixel[1] = convert_color_channel (src_pixel[1], + src_pixel[3]); + dst_pixel[2] = convert_color_channel (src_pixel[0], + src_pixel[3]); + dst_pixel[3] = src_pixel[3]; + + dst_pixel += 4; + src_pixel += 4; + } +} |