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authorRobin Watts <robin.watts@artifex.com>2016-07-08 17:56:38 +0100
committerRobin Watts <robin.watts@artifex.com>2016-07-08 17:57:39 +0100
commit16c8afb8322e33a5177251cb56688406c1ec02e5 (patch)
treed88bf60b53665ef1be88472b385be8213cc75240 /source/fitz
parentd08fbf57aa74e3947f198c03aaefd5356425cda3 (diff)
downloadmupdf-16c8afb8322e33a5177251cb56688406c1ec02e5.tar.xz
Bug 696872: Avoid trying to paint with zero alpha.
Short circuit any attempt to paint a pixmap with zero alpha.
Diffstat (limited to 'source/fitz')
-rw-r--r--source/fitz/draw-paint.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/source/fitz/draw-paint.c b/source/fitz/draw-paint.c
index d2883757..afeb989f 100644
--- a/source/fitz/draw-paint.c
+++ b/source/fitz/draw-paint.c
@@ -2123,6 +2123,9 @@ fz_paint_pixmap(fz_pixmap * restrict dst, const fz_pixmap * restrict src, int al
int x, y, w, h, n, da, sa;
fz_span_painter_t *fn;
+ if (alpha == 0)
+ return;
+
assert(dst->n - dst->alpha == src->n - src->alpha);
fz_pixmap_bbox_no_ctx(dst, &bbox);