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authorMichel Dänzer <michel@daenzer.net>2006-09-28 14:08:38 +0000
committerMichel Dänzer <michel@daenzer.net>2006-09-28 14:08:38 +0000
commit638ece315f4ee7be7f0fe0a0acd2550b4ccb8a7d (patch)
tree67eb42867b84c00b3e9276ed52675919f9f85300
parent941c8667394a3ea5b4793d988796e0f397390626 (diff)
Add helper function to calculate the area of the intersection of two rectangles.
-rw-r--r--src/mesa/drivers/dri/common/utils.c13
-rw-r--r--src/mesa/drivers/dri/common/utils.h2
2 files changed, 15 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/common/utils.c b/src/mesa/drivers/dri/common/utils.c
index 74ed299a62..6a189e7285 100644
--- a/src/mesa/drivers/dri/common/utils.c
+++ b/src/mesa/drivers/dri/common/utils.c
@@ -421,6 +421,19 @@ driCheckDriDdxDrmVersions2(const char * driver_name,
+GLint
+driIntersectArea( drm_clip_rect_t rect1, drm_clip_rect_t rect2 )
+{
+ if (rect2.x1 > rect1.x1) rect1.x1 = rect2.x1;
+ if (rect2.x2 < rect1.x2) rect1.x2 = rect2.x2;
+ if (rect2.y1 > rect1.y1) rect1.y1 = rect2.y1;
+ if (rect2.y2 < rect1.y2) rect1.y2 = rect2.y2;
+
+ if (rect1.x1 > rect1.x2 || rect1.y1 > rect1.y2) return 0;
+
+ return (rect1.x2 - rect1.x1) * (rect1.y2 - rect1.y1);
+}
+
GLboolean driClipRectToFramebuffer( const GLframebuffer *buffer,
GLint *x, GLint *y,
GLsizei *width, GLsizei *height )
diff --git a/src/mesa/drivers/dri/common/utils.h b/src/mesa/drivers/dri/common/utils.h
index 26d178f747..b2bab86e66 100644
--- a/src/mesa/drivers/dri/common/utils.h
+++ b/src/mesa/drivers/dri/common/utils.h
@@ -106,6 +106,8 @@ extern GLboolean driCheckDriDdxDrmVersions3(const char * driver_name,
const __DRIversion * ddxActual, const __DRIutilversion2 * ddxExpected,
const __DRIversion * drmActual, const __DRIversion * drmExpected);
+extern GLint driIntersectArea( drm_clip_rect_t rect1, drm_clip_rect_t rect2 );
+
extern GLboolean driClipRectToFramebuffer( const GLframebuffer *buffer,
GLint *x, GLint *y,
GLsizei *width, GLsizei *height );