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backend-drm: Analyze transformation chain to check if it's supported

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Instead of bailing based on our loosely tracked matrix "type" (that won't
recognize when an operation is reversed by its inverse) use the new
weston_matrix_to_transform to determine if the matrix reasonably matches.

Signed-off-by: Derek Foreman <derek.foreman@collabora.com>
This commit is contained in:
Derek Foreman 2022-01-27 11:25:16 -06:00
parent d14753e80c
commit 021fdf4244
1 changed files with 8 additions and 8 deletions
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16
libweston/backend-drm/drm-internal.h
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@ -666,17 +666,17 @@ drm_head_find_by_connector(struct drm_backend *backend, uint32_t connector_id);
static inline bool
drm_view_transform_supported(struct weston_view *ev, struct weston_output *output)
{
struct weston_buffer_viewport *viewport = &ev->surface->buffer_viewport;
struct weston_matrix transform;
enum wl_output_transform wt;
/* This will incorrectly disallow cases where the combination of
* buffer and view transformations match the output transform.
* Fixing this requires a full analysis of the transformation
* chain. */
if (ev->transform.enabled &&
ev->transform.matrix.type >= WESTON_MATRIX_TRANSFORM_ROTATE)
weston_view_buffer_to_output_matrix(ev, output, &transform);
/* if false, the transform doesn't map to any of the standard
* (ie: 90 degree) output transformations. */
if (!weston_matrix_to_transform(&transform, &wt))
return false;
if (viewport->buffer.transform != output->transform)
if (wt != WL_OUTPUT_TRANSFORM_NORMAL)
return false;
return true;