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author | Stefano Pigozzi <stefano.pigozzi@gmail.com> | 2015-02-07 13:54:18 +0100 |
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committer | Stefano Pigozzi <stefano.pigozzi@gmail.com> | 2015-03-04 10:06:08 +0100 |
commit | c028d782c1eec46e2416da483881f1d0b27c2be8 (patch) | |
tree | deb55f566d265b7facb3975b76441eae4d5c72e0 /video/out/vo_opengl.c | |
parent | 89306818bb3d2f6942e3cb6bb6c0ce01e7f7f65c (diff) | |
download | mpv-c028d782c1eec46e2416da483881f1d0b27c2be8.tar.bz2 mpv-c028d782c1eec46e2416da483881f1d0b27c2be8.tar.xz |
vo_opengl: add gamma-auto option
This automatically sets the gamma option depending on lighting conditions
measured from the computer's ambient light sensor.
sRGB – arguably the “sibling” to BT.709 for still images – has a reference
viewing environment defined in its specification (IEC 61966-2-1:1999, see
http://www.color.org/chardata/rgb/srgb.xalter). According to this data, the
assumed ambient illuminance is 64 lux. This is the illuminance where the gamma
that results from ICC color management is correct.
On the other hand, BT.1886 formalizes that the gamma level for dim environments
to be 2.40, and Apple resources (WWDC12: 2012 Session 523: Best practices for
color management) define the BT.1886 dim at 16 lux.
So the logic we apply is:
* >= 64lux -> 1.961 gamma
* =< 16lux -> 2.400 gamma
* 16lux < x < 64lux -> logaritmic rescale of lux to gamma. The human
perception of illuminance roughly follows a logaritmic scale of lux [1].
[1]: https://msdn.microsoft.com/en-us/library/windows/desktop/dd319008%28v=vs.85%29.aspx
Diffstat (limited to 'video/out/vo_opengl.c')
-rw-r--r-- | video/out/vo_opengl.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/video/out/vo_opengl.c b/video/out/vo_opengl.c index a9435eeac2..9318914dbd 100644 --- a/video/out/vo_opengl.c +++ b/video/out/vo_opengl.c @@ -276,6 +276,19 @@ static bool get_and_update_icc_profile(struct gl_priv *p, int *events) return true; } +static void get_and_update_ambient_lighting(struct gl_priv *p, int *events) +{ + int lux; + int r = p->glctx->vo_control(p->vo, events, VOCTRL_GET_AMBIENT_LUX, &lux); + if (r == VO_TRUE) { + gl_video_set_ambient_lux(p->renderer, lux); + } + if (r != VO_TRUE && p->renderer_opts->gamma_auto) { + MP_ERR(p, "gamma_auto option provided, but querying for ambient" + " lighting is not supported on this platform\n"); + } +} + static bool reparse_cmdline(struct gl_priv *p, char *args) { struct m_config *cfg = NULL; @@ -390,6 +403,10 @@ static int control(struct vo *vo, uint32_t request, void *data) get_and_update_icc_profile(p, &events); vo->want_redraw = true; } + if (events & VO_EVENT_AMBIENT_LIGHTING_CHANGED) { + get_and_update_ambient_lighting(p, &events); + vo->want_redraw = true; + } if (events & VO_EVENT_RESIZE) resize(p); if (events & VO_EVENT_EXPOSE) |