1 files changed, 57 insertions, 0 deletions
diff --git a/image/test/gtest/TestDownscalingFilterNoSkia.cpp b/image/test/gtest/TestDownscalingFilterNoSkia.cpp
new file mode 100644
index 000000000..c62ca018d
--- /dev/null
+++ b/image/test/gtest/TestDownscalingFilterNoSkia.cpp
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+
+#include "mozilla/gfx/2D.h"
+#include "Decoder.h"
+#include "DecoderFactory.h"
+#include "SourceBuffer.h"
+#include "SurfacePipe.h"
+
+// We want to ensure that we're testing the non-Skia fallback version of
+// DownscalingFilter, but there are two issues:
+//  (1) We don't know whether Skia is currently enabled.
+//  (2) If we force disable it, the disabled version will get linked into the
+//      binary and will cause the tests in TestDownscalingFilter to fail.
+// To avoid these problems, we ensure that MOZ_ENABLE_SKIA is defined when
+// including DownscalingFilter.h, and we use the preprocessor to redefine the
+// DownscalingFilter class to DownscalingFilterNoSkia.
+
+#define DownscalingFilter DownscalingFilterNoSkia
+
+#ifdef MOZ_ENABLE_SKIA
+
+#undef MOZ_ENABLE_SKIA
+#include "Common.h"
+#include "DownscalingFilter.h"
+#define MOZ_ENABLE_SKIA
+
+#else
+
+#include "Common.h"
+#include "DownscalingFilter.h"
+
+#endif
+
+#undef DownscalingFilter
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+using namespace mozilla::image;
+
+TEST(ImageDownscalingFilter, NoSkia)
+{
+  RefPtr<Decoder> decoder = CreateTrivialDecoder();
+  ASSERT_TRUE(bool(decoder));
+
+  // Configuring a DownscalingFilter should fail without Skia.
+  AssertConfiguringPipelineFails(decoder,
+                                 DownscalingConfig { IntSize(100, 100),
+                                                     SurfaceFormat::B8G8R8A8 },
+                                 SurfaceConfig { decoder, 0, IntSize(50, 50),
+                                                 SurfaceFormat::B8G8R8A8, false });
+}