diff options
author | emersion <contact@emersion.fr> | 2018-07-22 17:37:01 +0100 |
---|---|---|
committer | emersion <contact@emersion.fr> | 2018-08-02 23:33:59 +0100 |
commit | 2ebecb6727b55dbdfe067d27bdb1679014e66879 (patch) | |
tree | 144bff2e7fc6f27f56131d9b4c3262f36a0a6a6f /backend/drm | |
parent | e21563ec76b5f1f500b530cd2a5787123b26d627 (diff) |
backend/drm: allow to pass empty gamma ramp to reset it
Diffstat (limited to 'backend/drm')
-rw-r--r-- | backend/drm/drm.c | 48 |
1 files changed, 36 insertions, 12 deletions
diff --git a/backend/drm/drm.c b/backend/drm/drm.c index 3e6659f1..ce5a1640 100644 --- a/backend/drm/drm.c +++ b/backend/drm/drm.c @@ -228,19 +228,12 @@ static bool drm_connector_swap_buffers(struct wlr_output *output, return true; } -static bool drm_connector_set_gamma(struct wlr_output *output, - uint32_t size, uint16_t *r, uint16_t *g, uint16_t *b) { - struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output; - struct wlr_drm_backend *drm = (struct wlr_drm_backend *)output->backend; - - bool ok = false; - if (conn->crtc) { - ok = drm->iface->crtc_set_gamma(drm, conn->crtc, r, g, b, size); - if (ok) { - wlr_output_update_needs_swap(output); - } +static void fill_empty_gamma_table(uint32_t size, + uint16_t *r, uint16_t *g, uint16_t *b) { + for (uint32_t i = 0; i < size; ++i) { + uint16_t val = (uint32_t)0xffff * (uint32_t)i / (uint32_t)(size - 1); + r[i] = g[i] = b[i] = val; } - return ok; } static uint32_t drm_connector_get_gamma_size(struct wlr_output *output) { @@ -254,6 +247,37 @@ static uint32_t drm_connector_get_gamma_size(struct wlr_output *output) { return 0; } +static bool drm_connector_set_gamma(struct wlr_output *output, + uint32_t size, uint16_t *r, uint16_t *g, uint16_t *b) { + struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output; + struct wlr_drm_backend *drm = (struct wlr_drm_backend *)output->backend; + + if (!conn->crtc) { + return false; + } + + uint16_t *reset_table = NULL; + if (size == 0) { + size = drm_connector_get_gamma_size(output); + reset_table = malloc(3 * size * sizeof(uint16_t)); + if (reset_table == NULL) { + wlr_log(WLR_ERROR, "Failed to allocate gamma table"); + return false; + } + r = reset_table; + g = reset_table + size; + b = reset_table + 2 * size; + fill_empty_gamma_table(size, r, g, b); + } + + bool ok = drm->iface->crtc_set_gamma(drm, conn->crtc, r, g, b, size); + if (ok) { + wlr_output_update_needs_swap(output); + } + free(reset_table); + return ok; +} + static bool drm_connector_export_dmabuf(struct wlr_output *output, struct wlr_dmabuf_attributes *attribs) { struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output; |