change API contract: disallow zero-sized images or surfaces
BUG=skia:
Review URL: https://codereview.chromium.org/830033003
diff --git a/src/image/SkSurface_Raster.cpp b/src/image/SkSurface_Raster.cpp
index b221c13..2bac3f3 100644
--- a/src/image/SkSurface_Raster.cpp
+++ b/src/image/SkSurface_Raster.cpp
@@ -39,6 +39,10 @@
///////////////////////////////////////////////////////////////////////////////
bool SkSurface_Raster::Valid(const SkImageInfo& info, size_t rowBytes) {
+ if (info.isEmpty()) {
+ return false;
+ }
+
static const size_t kMaxTotalSize = SK_MaxS32;
int shift = 0;