| 1 | diff --git a/exa/exa_render.c b/exa/exa_render.c |
| 2 | index 172e2b5..807eeba 100644 |
| 3 | --- a/exa/exa_render.c |
| 4 | +++ b/exa/exa_render.c |
| 5 | @@ -1141,7 +1141,8 @@ exaTrapezoids(CARD8 op, PicturePtr pSrc, PicturePtr pDst, |
| 6 | |
| 7 | exaPrepareAccess(pPicture->pDrawable, EXA_PREPARE_DEST); |
| 8 | for (; ntrap; ntrap--, traps++) |
| 9 | - (*ps->RasterizeTrapezoid) (pPicture, traps, -bounds.x1, -bounds.y1); |
| 10 | + if (xTrapezoidValid(traps)) |
| 11 | + (*ps->RasterizeTrapezoid) (pPicture, traps, -bounds.x1, -bounds.y1); |
| 12 | exaFinishAccess(pPicture->pDrawable, EXA_PREPARE_DEST); |
| 13 | |
| 14 | xRel = bounds.x1 + xSrc - xDst; |
| 15 | diff --git a/render/picture.h b/render/picture.h |
| 16 | index c85353a..49eb263 100644 |
| 17 | --- a/render/picture.h |
| 18 | +++ b/render/picture.h |
| 19 | @@ -211,7 +211,7 @@ typedef pixman_fixed_t xFixed; |
| 20 | /* whether 't' is a well defined not obviously empty trapezoid */ |
| 21 | #define xTrapezoidValid(t) ((t)->left.p1.y != (t)->left.p2.y && \ |
| 22 | (t)->right.p1.y != (t)->right.p2.y && \ |
| 23 | - (int) ((t)->bottom - (t)->top) > 0) |
| 24 | + (t)->bottom > 0 && (int) ((t)->bottom - (t)->top) > 0) |
| 25 | |
| 26 | /* |
| 27 | * Standard NTSC luminance conversions: |