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authorVille Syrjälä <ville.syrjala@linux.intel.com>2013-04-24 19:52:35 +0400
committerDaniel Vetter <daniel.vetter@ffwll.ch>2013-05-01 00:19:39 +0400
commit4954c4282f6b945f1dd5716f92b594a07fa4ffe3 (patch)
tree3c72d5bd093e1c066cd1ef8c0f9608231ad4d44f /include/drm/drm_rect.h
parent3512f976d252bd5d07d04e9e157f0cd210c959a0 (diff)
downloadlinux-4954c4282f6b945f1dd5716f92b594a07fa4ffe3.tar.xz
drm: Add drm_rect_calc_{hscale, vscale}() utility functions
These functions calculate the scaling factor based on the source and destination rectangles. There are two version of the functions, the strict ones that will return an error if the min/max scaling factor is exceeded, and the relaxed versions that will adjust the src/dst rectangles in order to keep the scaling factor withing the limits. v2: Return error instead of adjusting regions, refactor common parts into one function, and split into strict and relaxed versions. v3: Renamed drm_region to drm_rect, add "_rect_" to the function names. v4: Fix "calculcate" typos Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Acked-by: Dave Airlie <airlied@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'include/drm/drm_rect.h')
-rw-r--r--include/drm/drm_rect.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/drm/drm_rect.h b/include/drm/drm_rect.h
index 2b7278c1bc42..de24f16a3c4f 100644
--- a/include/drm/drm_rect.h
+++ b/include/drm/drm_rect.h
@@ -128,5 +128,17 @@ bool drm_rect_intersect(struct drm_rect *r, const struct drm_rect *clip);
bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst,
const struct drm_rect *clip,
int hscale, int vscale);
+int drm_rect_calc_hscale(const struct drm_rect *src,
+ const struct drm_rect *dst,
+ int min_hscale, int max_hscale);
+int drm_rect_calc_vscale(const struct drm_rect *src,
+ const struct drm_rect *dst,
+ int min_vscale, int max_vscale);
+int drm_rect_calc_hscale_relaxed(struct drm_rect *src,
+ struct drm_rect *dst,
+ int min_hscale, int max_hscale);
+int drm_rect_calc_vscale_relaxed(struct drm_rect *src,
+ struct drm_rect *dst,
+ int min_vscale, int max_vscale);
#endif