commit bb7390261a7b84669129a23643cd21fd022702d7
author Nigel Tao <nigeltao@golang.org> Tue Dec 15 22:07:31 2020 +1100
committer Nigel Tao <nigeltao@golang.org> Tue Dec 15 22:07:31 2020 +1100
tree 8e2dc0b6561a1f197348d1ab7b8aac023d6a7d2f
parent 0f807639c102dca28d898b7cfc6bb4a255b11615

Have gif_fuzzer sometimes use a BGRA_PREMUL dst

fuzz/c/std/gif_fuzzer.c

diff --git a/fuzz/c/std/gif_fuzzer.c b/fuzz/c/std/gif_fuzzer.c
index 5c483f8..e8950a4 100644
--- a/fuzz/c/std/gif_fuzzer.c
+++ b/fuzz/c/std/gif_fuzzer.c
@@ -74,6 +74,7 @@
         &dec, sizeof dec, WUFFS_VERSION,
         (hash & 1) ? WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED
                    : 0);
+    hash >>= 1;
     if (!wuffs_base__status__is_ok(&status)) {
       ret = wuffs_base__status__message(&status);
       goto exit;
@@ -90,6 +91,16 @@
       goto exit;
     }
 
+    // 50% of the time, choose BGRA_PREMUL instead of the native pixel config.
+    if (hash & 1) {
+      wuffs_base__pixel_config__set(
+          &ic.pixcfg, WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL,
+          WUFFS_BASE__PIXEL_SUBSAMPLING__NONE,
+          wuffs_base__pixel_config__width(&ic.pixcfg),
+          wuffs_base__pixel_config__height(&ic.pixcfg));
+    }
+    hash >>= 1;
+
     // Wuffs allows either statically or dynamically allocated work buffers.
     // This program exercises dynamic allocation.
     uint64_t n = wuffs_gif__decoder__workbuf_len(&dec).max_incl;