Test a GIF with an out of range transparent index
Bug: skia:8461
According to skbug.com/7069, we should allow GIFs to use a transparent
index outside of the range of the color table. Add a test to verify
support for this.
The GIF is 2x2 with the following pixels:
-------------------------------------------------
| black | white |
-------------------------------------------------
| transparent | transparent |
-------------------------------------------------
The color table only has 2 entries (black and white), and the
transparent index is 2.
Change-Id: I16574a61e2982b6628c3eca96cb7b3e1f57d3b2a
Reviewed-on: https://skia-review.googlesource.com/c/161561
Reviewed-by: Nigel Tao <nigeltao@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
Auto-Submit: Leon Scroggins <scroggo@google.com>
diff --git a/resources/images/out-of-palette.gif b/resources/images/out-of-palette.gif
new file mode 100644
index 0000000..20f71cd
--- /dev/null
+++ b/resources/images/out-of-palette.gif
Binary files differ
diff --git a/tests/GifTest.cpp b/tests/GifTest.cpp
index 0de5fc5..fc61ffc 100644
--- a/tests/GifTest.cpp
+++ b/tests/GifTest.cpp
@@ -281,3 +281,45 @@
// too early.
REPORTER_ASSERT(r, codec->getFrameCount() == 0);
}
+
+DEF_TEST(Codec_gif_out_of_palette, r) {
+ if (GetResourcePath().isEmpty()) {
+ return;
+ }
+
+ const char* path = "images/out-of-palette.gif";
+ auto data = GetResourceAsData(path);
+ if (!data) {
+ ERRORF(r, "failed to find %s", path);
+ return;
+ }
+
+ auto codec = SkCodec::MakeFromData(std::move(data));
+ if (!codec) {
+ ERRORF(r, "Could not create codec from %s", path);
+ return;
+ }
+
+ SkBitmap bm;
+ bm.allocPixels(codec->getInfo());
+ auto result = codec->getPixels(bm.pixmap());
+ REPORTER_ASSERT(r, result == SkCodec::kSuccess, "Failed to decode %s with error %s",
+ path, SkCodec::ResultToString(result));
+
+ struct {
+ int x;
+ int y;
+ SkColor expected;
+ } pixels[] = {
+ { 0, 0, SK_ColorBLACK },
+ { 1, 0, SK_ColorWHITE },
+ { 0, 1, SK_ColorTRANSPARENT },
+ { 1, 1, SK_ColorTRANSPARENT },
+ };
+ for (auto& pixel : pixels) {
+ auto actual = bm.getColor(pixel.x, pixel.y);
+ REPORTER_ASSERT(r, actual == pixel.expected,
+ "pixel (%i,%i) mismatch! expected: %x actual: %x",
+ pixel.x, pixel.y, pixel.expected, actual);
+ }
+}
