backend/drm: allow to pass empty gamma ramp to reset it
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e21563ec76
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2ebecb6727
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@ -228,19 +228,12 @@ static bool drm_connector_swap_buffers(struct wlr_output *output,
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return true;
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}
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static bool drm_connector_set_gamma(struct wlr_output *output,
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uint32_t size, uint16_t *r, uint16_t *g, uint16_t *b) {
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struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
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struct wlr_drm_backend *drm = (struct wlr_drm_backend *)output->backend;
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bool ok = false;
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if (conn->crtc) {
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ok = drm->iface->crtc_set_gamma(drm, conn->crtc, r, g, b, size);
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if (ok) {
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wlr_output_update_needs_swap(output);
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}
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static void fill_empty_gamma_table(uint32_t size,
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uint16_t *r, uint16_t *g, uint16_t *b) {
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for (uint32_t i = 0; i < size; ++i) {
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uint16_t val = (uint32_t)0xffff * (uint32_t)i / (uint32_t)(size - 1);
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r[i] = g[i] = b[i] = val;
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}
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return ok;
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}
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static uint32_t drm_connector_get_gamma_size(struct wlr_output *output) {
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@ -254,6 +247,37 @@ static uint32_t drm_connector_get_gamma_size(struct wlr_output *output) {
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return 0;
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}
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static bool drm_connector_set_gamma(struct wlr_output *output,
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uint32_t size, uint16_t *r, uint16_t *g, uint16_t *b) {
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struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
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struct wlr_drm_backend *drm = (struct wlr_drm_backend *)output->backend;
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if (!conn->crtc) {
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return false;
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}
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uint16_t *reset_table = NULL;
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if (size == 0) {
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size = drm_connector_get_gamma_size(output);
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reset_table = malloc(3 * size * sizeof(uint16_t));
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if (reset_table == NULL) {
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wlr_log(WLR_ERROR, "Failed to allocate gamma table");
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return false;
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}
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r = reset_table;
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g = reset_table + size;
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b = reset_table + 2 * size;
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fill_empty_gamma_table(size, r, g, b);
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}
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bool ok = drm->iface->crtc_set_gamma(drm, conn->crtc, r, g, b, size);
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if (ok) {
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wlr_output_update_needs_swap(output);
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}
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free(reset_table);
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return ok;
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}
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static bool drm_connector_export_dmabuf(struct wlr_output *output,
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struct wlr_dmabuf_attributes *attribs) {
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struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
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@ -182,6 +182,8 @@ uint32_t wlr_output_get_gamma_size(struct wlr_output *output);
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* Sets the gamma table for this output. `r`, `g` and `b` are gamma ramps for
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* red, green and blue. `size` is the length of the ramps and must not exceed
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* the value returned by `wlr_output_get_gamma_size`.
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*
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* Providing zero-sized ramps resets the gamma table.
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*/
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bool wlr_output_set_gamma(struct wlr_output *output,
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uint32_t size, uint16_t *r, uint16_t *g, uint16_t *b);
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