Registry-based unit test for custom effects

Review URL: http://codereview.appspot.com/6447085/



git-svn-id: http://skia.googlecode.com/svn/trunk@4946 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 73 insertions, 0 deletions

diff --git a/include/gpu/GrCustomStageUnitTest.h b/include/gpu/GrCustomStageUnitTest.h
new file mode 100644
index 0000000000..9cbadf3a5b
--- /dev/null
+++ b/include/gpu/GrCustomStageUnitTest.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrCustomStageUnitTest_DEFINED
+#define GrCustomStageUnitTest_DEFINED
+
+#include "SkRandom.h"
+
+#if SK_ALLOW_STATIC_GLOBAL_INITIALIZERS
+
+class GrCustomStage;
+class GrContext;
+class GrTexture;
+
+class GrCustomStageTestFactory : GrNoncopyable {
+public:
+    // Used to access the dummy textures in TestCreate procs.
+    enum {
+        kSkiaPMTextureIdx = 0,
+        kAlphaTextureIdx = 1,
+    };
+
+    typedef GrCustomStage* (*CreateProc)(SkRandom*, GrContext*, GrTexture* dummyTextures[]);
+
+    GrCustomStageTestFactory(CreateProc createProc) {
+        fCreateProc = createProc;
+        GetFactories()->push_back(this);
+    }
+
+    static GrCustomStage* CreateStage(SkRandom* random,
+                                      GrContext* context,
+                                      GrTexture* dummyTextures[]) {
+        uint32_t idx = random->nextRangeU(0, GetFactories()->count() - 1);
+        GrCustomStageTestFactory* factory = (*GetFactories())[idx];
+        return factory->fCreateProc(random, context, dummyTextures);
+    }
+
+private:
+    CreateProc fCreateProc;
+    static SkTArray<GrCustomStageTestFactory*, true>* GetFactories();
+};
+
+/** GrCustomStage subclasses should insert this macro in their declaration to be included in the
+ *  program generation unit test.
+ */
+#define GR_DECLARE_CUSTOM_STAGE_TEST                                           \
+    static GrCustomStageTestFactory gTestFactory;                              \
+    static GrCustomStage* TestCreate(SkRandom*, GrContext*, GrTexture* dummyTextures[2])
+
+/** GrCustomStage subclasses should insert this macro in their implemenation file. They must then
+ *  also implement this static function:
+ *      GrCustomStage* CreateStage(SkRandom*, GrContext*, GrTexture* dummyTextures[2]);
+ *  dummyTextures[] are valied textures that they can optionally use for their texture accesses. The
+  * first texture has config kSkia8888_PM_GrPixelConfig and the second has kAlpha_8_GrPixelConfig.
+  * TestCreate functions are also free to create additional textures using the GrContext.
+ */
+#define GR_DEFINE_CUSTOM_STAGE_TEST(CustomStage)                               \
+    GrCustomStageTestFactory CustomStage :: gTestFactory(CustomStage :: TestCreate)
+
+#else // !SK_ALLOW_STATIC_GLOBAL_INITIALIZERS
+
+// The unit test relies on static initializers. Just declare the TestCreate function so that
+// its definitions will compile.
+#define GR_DECLARE_CUSTOM_STAGE_TEST \
+    static GrCustomStage* TestCreate(SkRandom*, GrContext*, GrTexture* dummyTextures[2])
+#define GR_DEFINE_CUSTOM_STAGE_TEST(X)
+
+#endif // !SK_ALLOW_STATIC_GLOBAL_INITIALIZERS
+#endif
\ No newline at end of file