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Handle transform failure when computing shadow damage area.

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PictureTransformBounds can fail, when this happens, damage the entire screen
so that the shadow gets repainted correctly.
This commit is contained in:
Keith Packard
2008-04-29 08:29:42 -07:00
parent 9c7679240a
commit c4b9ab6bf5
3 changed files with 35 additions and 23 deletions
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7
render/matrix.c
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@@ -84,7 +84,6 @@ _X_EXPORT Bool
PictureTransformPoint (PictTransformPtr transform,
PictVectorPtr vector)
{
PictVector result;
int i, j;
xFixed_32_32 partial;
xFixed_34_30 v[3];
@@ -227,7 +226,7 @@ PictureTransformTranslate (PictTransformPtr forward,
return TRUE;
}
_X_EXPORT void
_X_EXPORT Bool
PictureTransformBounds (BoxPtr b, PictTransformPtr matrix)
{
PictVector v[4];
@@ -240,7 +239,8 @@ PictureTransformBounds (BoxPtr b, PictTransformPtr matrix)
v[3].vector[0] = F (b->x1); v[3].vector[1] = F (b->y2); v[3].vector[2] = F(1);
for (i = 0; i < 4; i++)
{
PictureTransformPoint (matrix, &v[i]);
if (!PictureTransformPoint (matrix, &v[i]))
return FALSE;
x1 = xFixedToInt (v[i].vector[0]);
y1 = xFixedToInt (v[i].vector[1]);
x2 = xFixedToInt (xFixedCeil (v[i].vector[0]));
@@ -258,6 +258,7 @@ PictureTransformBounds (BoxPtr b, PictTransformPtr matrix)
if (y2 > b->y2) b->y2 = y2;
}
}
return TRUE;
}
_X_EXPORT Bool

2
render/picturestr.h
View File

@@ -724,7 +724,7 @@ PictureTransformTranslate (PictTransformPtr forward,
PictTransformPtr reverse,
xFixed tx, xFixed ty);
void
Bool
PictureTransformBounds (BoxPtr b, PictTransformPtr matrix);
Bool