[vlc-commits] direct3d11: document the pixel conversion matrices

[Steve Lhomme]

vlc | branch: master | Steve Lhomme <robUx4 at videolabs.io> | Tue Mar  7 16:39:35 2017 +0100| [ec18b1f4c00efff379b78427570c69a23880f122] | committer: Jean-Baptiste Kempf

direct3d11: document the pixel conversion matrices

Signed-off-by: Jean-Baptiste Kempf <jb at videolan.org>

> http://git.videolan.org/gitweb.cgi/vlc.git/?a=commit;h=ec18b1f4c00efff379b78427570c69a23880f122
---

 modules/video_output/win32/direct3d11.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/modules/video_output/win32/direct3d11.c b/modules/video_output/win32/direct3d11.c
index 237376f..ca6ca33 100644
--- a/modules/video_output/win32/direct3d11.c
+++ b/modules/video_output/win32/direct3d11.c
@@ -2190,12 +2190,16 @@ static int SetupQuad(vout_display_t *vd, const video_format_t *fmt, d3d_quad_t *
         0.f, 0.f, 1.f, 0.f,
         0.f, 0.f, 0.f, 1.f,
     };
+
+    /* matrices for studio range */
+    /* see https://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.601_conversion, in studio range */
     static const FLOAT COLORSPACE_BT601_TO_FULL[4*4] = {
         1.164383561643836f,                 0.f,  1.596026785714286f, 0.f,
         1.164383561643836f, -0.391762290094914f, -0.812967647237771f, 0.f,
         1.164383561643836f,  2.017232142857142f,                 0.f, 0.f,
                        0.f,                 0.f,                 0.f, 1.f,
     };
+    /* see https://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.709_conversion, in studio range */
     static const FLOAT COLORSPACE_BT709_TO_FULL[4*4] = {
         1.164383561643836f,                 0.f,  1.792741071428571f, 0.f,
         1.164383561643836f, -0.213248614273730f, -0.532909328559444f, 0.f,