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Aegisub
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Fix conversion of video frames to RGB 

Video frames aren't actually BGRA; the alpha channel is actually just
garbage since CSRI uses 0 for opaque and other things use 255. To work
around this, add a custom colorspace converter.

Fixes the subtitles preview in the style editor and copying frames to
the clipboard/saving them.

Closes #1621.
This commit is contained in:
Thomas Goyne 2013-07-04 08:25:25 -07:00
parent cb3b72af36
commit ecc08f5e77
1 changed files with 15 additions and 1 deletions
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16
aegisub/src/video_frame.cpp
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@ -30,6 +30,20 @@ VideoFrame::VideoFrame(const unsigned char *data, size_t width, size_t height, s
{
}
namespace {
// We actually have bgr_, not bgra, so we need a custom converter which ignores the alpha channel
struct color_converter {
template <typename P1, typename P2>
void operator()(P1 const& src, P2& dst) const {
using namespace boost::gil;
dst = rgb8_pixel_t(
get_color(src, red_t()),
get_color(src, green_t()),
get_color(src, blue_t()));
}
};
}
wxImage GetImage(VideoFrame const& frame) {
using namespace boost::gil;
@ -38,6 +52,6 @@ wxImage GetImage(VideoFrame const& frame) {
auto dst = interleaved_view(frame.width, frame.height, (rgb8_pixel_t*)img.GetData(), 3 * frame.width);
if (frame.flipped)
src = flipped_up_down_view(src);
copy_and_convert_pixels(src, dst);
copy_and_convert_pixels(src, dst, color_converter());
return img;
}