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Diffstat (limited to '')
-rw-r--r-- | libgamma_quartz_cg_crtc_get_gamma_rampsf.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/libgamma_quartz_cg_crtc_get_gamma_rampsf.c b/libgamma_quartz_cg_crtc_get_gamma_rampsf.c new file mode 100644 index 0000000..a2e8056 --- /dev/null +++ b/libgamma_quartz_cg_crtc_get_gamma_rampsf.c @@ -0,0 +1,35 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" + + +/** + * Get the current gamma ramps for a CRTC, `float` version + * + * @param this The CRTC state + * @param ramps The gamma ramps to fill with the current values + * @return Zero on success, otherwise (negative) the value of an + * error identifier provided by this library + */ +int +libgamma_quartz_cg_crtc_get_gamma_rampsf(libgamma_crtc_state_t *restrict this, libgamma_gamma_rampsf_t *restrict ramps) +{ + CGDirectDisplayID *restrict crtcs = this->partition->data; + CGDirectDisplayID crtc_id = crtcs[this->crtc]; + uint32_t gamma_size_out; + CGError r; +#ifdef DEBUG + /* Gamma ramps 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 + /* Read current gamma ramps */ + r = CGGetDisplayTransferByTable(crtc_id, (uint32_t)ramps->red_size, ramps->red, ramps->green, ramps->blue, &gamma_size_out); + if (r != kCGErrorSuccess) + return LIBGAMMA_GAMMA_RAMP_READ_FAILED; + /* I hope that it will not actually ever change, + but it does return the the gamma ramp size despite + that it can be queried without querying for more */ + if (gamma_size_out != ramps->red_size) + return LIBGAMMA_GAMMA_RAMP_SIZE_CHANGED; + return 0; +} |