diff options
Diffstat (limited to '')
-rw-r--r-- | libgamma_linux_drm_crtc_set_gamma_ramps16.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/libgamma_linux_drm_crtc_set_gamma_ramps16.c b/libgamma_linux_drm_crtc_set_gamma_ramps16.c new file mode 100644 index 0000000..9691581 --- /dev/null +++ b/libgamma_linux_drm_crtc_set_gamma_ramps16.c @@ -0,0 +1,54 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" + + +/** + * Set the gamma ramps for a CRTC, 16-bit gamma-depth version + * + * @param this The CRTC state + * @param ramps The gamma ramps to apply + * @return Zero on success, otherwise (negative) the value of an + * error identifier provided by this library + */ +int +libgamma_linux_drm_crtc_set_gamma_ramps16(libgamma_crtc_state_t *restrict this, const libgamma_gamma_ramps16_t *restrict ramps) +{ + libgamma_drm_card_data_t *restrict card = this->partition->data; + int r; +#ifdef DEBUG + /* Gamma ramp sizes are identical but not fixed */ + if (ramps->red_size != ramps->green_size || ramps->red_size != ramps->blue_size) + return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE; +#endif + + /* Apply gamma ramps */ + r = drmModeCrtcSetGamma(card->fd, (uint32_t)(size_t)this->data, + (uint32_t)ramps->red_size, ramps->red, ramps->green, ramps->blue); + /* Check for errors */ + if (r) { + switch (errno) { + case EACCES: + case EAGAIN: + case EIO: + /* Permission denied errors must be ignored, because we do not + * have permission to do this while a display server is active. + * We are also checking for some other error codes just in case. */ + case EBUSY: + case EINPROGRESS: + /* It is hard to find documentation for DRM (in fact all of this is + * just based on the functions names and some testing,) perhaps we + * could get this if we are updating to fast. */ + break; + case EBADF: + case ENODEV: + case ENXIO: + /* TODO: I have not actually tested removing my graphics card or, + * monitor but I imagine either of these is what would happen. */ + return LIBGAMMA_GRAPHICS_CARD_REMOVED; + + default: + return LIBGAMMA_ERRNO_SET; + } + } + return 0; +} |