YUV to RGB converter

gm/yuvtorgbeffect.cpp

Index: gm/yuvtorgbeffect.cpp
diff --git a/gm/yuvtorgbeffect.cpp b/gm/yuvtorgbeffect.cpp
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+++ b/gm/yuvtorgbeffect.cpp
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+
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+// This test only works with the GPU backend.
+
+#include "gm.h"
+
+#if SK_SUPPORT_GPU
+
+#include "GrContext.h"
+#include "GrTest.h"
+#include "effects/GrYUVtoRGBEffect.h"
+#include "SkBitmap.h"
+#include "SkGr.h"
+#include "SkGradientShader.h"
+
+namespace skiagm {
+/**
+ * This GM directly exercises GrYUVtoRGBEffect.
+ */
+class YUVtoRGBEffect : public GM {
+public:
+    YUVtoRGBEffect() {
+        this->setBGColor(0xFFFFFFFF);
+    }
+
+protected:
+    virtual SkString onShortName() SK_OVERRIDE {
+        return SkString("yuv_to_rgb_effect");
+    }
+
+    virtual SkISize onISize() SK_OVERRIDE {
+        return SkISize::Make(334, 64);
+    }
+
+    virtual uint32_t onGetFlags() const SK_OVERRIDE {
+        // This is a GPU-specific GM.
+        return kGPUOnly_Flag;
+    }
+
+    virtual void onOnceBeforeDraw() SK_OVERRIDE {
+        SkImageInfo info = SkImageInfo::MakeA8(24, 24);
+        fBmp[0].allocPixels(info);
+        fBmp[1].allocPixels(info);
+        fBmp[2].allocPixels(info);
+        unsigned char* pixels[3];
+        for (int i = 0; i < 3; ++i) {
+            pixels[i] = (unsigned char*)fBmp[i].getPixels();
+        }
+        int color[] = {0, 85, 170};
+        const int limit[] = {255, 0, 255};
+        const int invl[]  = {0, 255, 0};
+        const int inc[]   = {1, -1, 1};
+        for (int j = 0; j < 576; ++j) {
+            for (int i = 0; i < 3; ++i) {
+                pixels[i][j] = (unsigned char)color[i];
+                color[i] = (color[i] == limit[i]) ? invl[i] : color[i] + inc[i];
+            }
+        }
+    }
+
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+        GrRenderTarget* rt = canvas->internal_private_accessTopLayerRenderTarget();
+        if (NULL == rt) {
+            return;
+        }
+        GrContext* context = rt->getContext();
+        if (NULL == context) {
+            return;
+        }
+
+        GrTestTarget tt;
+        context->getTestTarget(&tt);
+        if (NULL == tt.target()) {
+            SkDEBUGFAIL("Couldn't get Gr test target.");
+            return;
+        }
+
+        GrDrawState* drawState = tt.target()->drawState();
+
+        GrTexture* texture[3];
+        texture[0] = GrLockAndRefCachedBitmapTexture(context, fBmp[0], NULL);
+        texture[1] = GrLockAndRefCachedBitmapTexture(context, fBmp[1], NULL);
+        texture[2] = GrLockAndRefCachedBitmapTexture(context, fBmp[2], NULL);
+        if ((NULL == texture[0]) || (NULL == texture[1]) || (NULL == texture[2])) {
+            return;
+        }
+
+        static const SkScalar kDrawPad = 10.f;
+        static const SkScalar kTestPad = 10.f;
+
+        SkRect renderRect = SkRect::MakeWH(SkIntToScalar(fBmp[0].width()),
+                                           SkIntToScalar(fBmp[0].height()));
+        renderRect.outset(kDrawPad, kDrawPad);
+
+        SkScalar y = kDrawPad + kTestPad;
+        SkScalar x = kDrawPad + kTestPad;
+
+        const int indices[6][3] = {{0, 1, 2}, {0, 2, 1}, {1, 0, 2}, {1, 2, 0}, {2, 0, 1}, {2, 1, 0}};
+
+        for (int i = 0; i < 6; ++i) {
+            SkAutoTUnref<GrEffectRef> effect(
+                        GrYUVtoRGBEffect::Create(texture[indices[i][0]],
+                                                 texture[indices[i][1]],
+                                                 texture[indices[i][2]]));
+            if (effect) {
+                SkMatrix viewMatrix;
+                viewMatrix.setTranslate(x, y);
+                drawState->reset(viewMatrix);
+                drawState->setRenderTarget(rt);
+                drawState->setColor(0xffffffff);
+                drawState->addColorEffect(effect, 1);
+                tt.target()->drawSimpleRect(renderRect);
+            }
+            x += renderRect.width() + kTestPad;
+        }
+
+        GrUnlockAndUnrefCachedBitmapTexture(texture[0]);
+        GrUnlockAndUnrefCachedBitmapTexture(texture[1]);
+        GrUnlockAndUnrefCachedBitmapTexture(texture[2]);
+    }
+
+private:
+    SkBitmap fBmp[3];
+
+    typedef GM INHERITED;
+};
+
+DEF_GM( return SkNEW(YUVtoRGBEffect); )
+}
+
+#endif