commit b291d417b9d88cb97f09620c54294b1276c34952
author John Stiles <johnstiles@google.com> Wed Apr 12 17:33:19 2023 -0400
committer SkCQ <skcq-be@skia-corp.google.com.iam.gserviceaccount.com> Wed Apr 12 22:17:11 2023 +0000
tree a56ed1d228017045b81cbef2b25c1a2a4e26bd77
parent 8811dc695f8e9abd973b70641653ec95fbbdee78

Fuzz runtime effects more quickly by painting less.

The fuzzer hit a 20-second timeout by crafting a very complex shader
(it calls normalize thousands of times) and then painting it to our
128x128 test surface.

For the purposes of a fuzz test, we don't need to paint so many
pixels. We now use a 4x4 surface; it'll still catch bugs, and will
execute 1024x faster.

Bug: oss-fuzz:57942
Change-Id: I27e083146d46391398ce7813ac9b4fc70e503316
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/670342
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: Nolan Scobie <nscobie@google.com>
Reviewed-by: Nolan Scobie <nscobie@google.com>

fuzz/oss_fuzz/FuzzSkRuntimeEffect.cpp

diff --git a/fuzz/oss_fuzz/FuzzSkRuntimeEffect.cpp b/fuzz/oss_fuzz/FuzzSkRuntimeEffect.cpp
index a75587f..46ed1b6 100644
--- a/fuzz/oss_fuzz/FuzzSkRuntimeEffect.cpp
+++ b/fuzz/oss_fuzz/FuzzSkRuntimeEffect.cpp
@@ -89,7 +89,7 @@
     SkPaint paint;
     paint.setShader(std::move(shader));
 
-    sk_sp<SkSurface> s = SkSurface::MakeRasterN32Premul(128, 128);
+    sk_sp<SkSurface> s = SkSurface::MakeRasterN32Premul(4, 4);
     if (!s) {
         return false;
     }