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Introduce a helper to get a property value

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This will be useful for other properties, like IN_FORMATS.
This commit is contained in:
Simon Ser 2021-02-01 14:18:26 +01:00
parent 7f65dedbab
commit 91e7ca45fc
1 changed files with 35 additions and 28 deletions
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63
src/drm.cpp
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@ -123,16 +123,30 @@ static int find_drm_device(drmModeRes **resources)
return fd;
}
/* Seems like there is some room for a drmModeObjectGetNamedProperty()
* type helper in libdrm..
*/
static bool get_prop_value(struct drm_t *drm, drmModeObjectProperties *props, const char *name, uint64_t *out) {
for (uint32_t i = 0; i < props->count_props; i++) {
drmModePropertyRes *p = drmModeGetProperty(drm->fd, props->props[i]);
bool found = strcmp(p->name, name) == 0;
drmModeFreeProperty(p);
if (found) {
*out = props->prop_values[i];
return true;
}
}
return false;
}
/* Pick a plane.. something that at a minimum can be connected to
* the chosen crtc, but prefer primary plane.
*
* Seems like there is some room for a drmModeObjectGetNamedProperty()
* type helper in libdrm..
*/
static int get_plane_id(struct drm_t *drm)
{
drmModePlaneResPtr plane_resources;
uint32_t i, j;
uint32_t i;
int ret = -EINVAL;
int found_primary = 0;
@ -152,35 +166,28 @@ static int get_plane_id(struct drm_t *drm)
if (plane->possible_crtcs & (1 << drm->crtc_index)) {
drmModeObjectPropertiesPtr props =
drmModeObjectGetProperties(drm->fd, id, DRM_MODE_OBJECT_PLANE);
drmModeObjectGetProperties(drm->fd, id, DRM_MODE_OBJECT_PLANE);
/* primary or not, this plane is good enough to use: */
ret = id;
for (j = 0; j < props->count_props; j++) {
drmModePropertyPtr p =
drmModeGetProperty(drm->fd, props->props[j]);
if ((strcmp(p->name, "type") == 0) &&
(props->prop_values[j] == DRM_PLANE_TYPE_PRIMARY)) {
/* found our primary plane, lets use that: */
for (uint32_t k = 0; k < plane->count_formats; k++)
{
uint32_t fmt = plane->formats[k];
if (fmt == DRM_FORMAT_XRGB8888) {
// Prefer formats without alpha channel for main plane
g_nDRMFormat = fmt;
break;
} else if (fmt == DRM_FORMAT_ARGB8888) {
g_nDRMFormat = fmt;
}
uint64_t plane_type;
if (get_prop_value(drm, props, "type", &plane_type) && plane_type == DRM_PLANE_TYPE_PRIMARY) {
/* found our primary plane, lets use that: */
for (uint32_t k = 0; k < plane->count_formats; k++)
{
uint32_t fmt = plane->formats[k];
if (fmt == DRM_FORMAT_XRGB8888) {
// Prefer formats without alpha channel for main plane
g_nDRMFormat = fmt;
break;
} else if (fmt == DRM_FORMAT_ARGB8888) {
g_nDRMFormat = fmt;
}
found_primary = 1;
}
drmModeFreeProperty(p);
found_primary = 1;
}
drmModeFreeObjectProperties(props);