Add GM that tests GrTextureDomain and fix bug where kDecal_Mode gets incorrectly ignored.

gm/texturedomaineffect.cpp

Index: gm/texturedomaineffect.cpp
diff --git a/gm/texturedomaineffect.cpp b/gm/texturedomaineffect.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..364336918269b1bda460e6f14d8bc91553ef8c8c
--- /dev/null
+++ b/gm/texturedomaineffect.cpp
@@ -0,0 +1,158 @@
+
+/*
+ * 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/GrTextureDomain.h"
+#include "SkBitmap.h"
+#include "SkGr.h"
+#include "SkGradientShader.h"
+
+namespace skiagm {
+/**
+ * This GM directly exercises GrTextureDomainEffect.
+ */
+class TextureDomainEffect : public GM {
+public:
+    TextureDomainEffect() {
+        this->setBGColor(0xFFFFFFFF);
+    }
+
+protected:
+    virtual SkString onShortName() SK_OVERRIDE {
+        return SkString("texture_domain_effect");
+    }
+
+    virtual SkISize onISize() SK_OVERRIDE {
+        return make_isize(400, 800);
+    }
+
+    virtual uint32_t onGetFlags() const SK_OVERRIDE {
+        // This is a GPU-specific GM.
+        return kGPUOnly_Flag;
+    }
+
+    virtual void onOnceBeforeDraw() SK_OVERRIDE {
+        fBmp.allocN32Pixels(100, 100);
+        SkCanvas canvas(fBmp);
+        SkPaint paint;
+
+        SkColor colors1[] = { SK_ColorCYAN, SK_ColorLTGRAY, SK_ColorGRAY };
+        paint.setShader(SkGradientShader::CreateSweep(65.f, 75.f, colors1,
+                                                      NULL, SK_ARRAY_COUNT(colors1)))->unref();
+        canvas.drawOval(SkRect::MakeXYWH(-5.f, -5.f,
+                                         fBmp.width() + 10.f, fBmp.height() + 10.f), paint);
+
+        SkColor colors2[] = { SK_ColorMAGENTA, SK_ColorLTGRAY, SK_ColorYELLOW };
+        paint.setShader(SkGradientShader::CreateSweep(45.f, 55.f, colors2, NULL,
+                                                      SK_ARRAY_COUNT(colors2)))->unref();
+        paint.setXfermodeMode(SkXfermode::kDarken_Mode);
+        canvas.drawOval(SkRect::MakeXYWH(-5.f, -5.f,
+                                         fBmp.width() + 10.f, fBmp.height() + 10.f), paint);
+
+        SkColor colors3[] = { SK_ColorBLUE, SK_ColorLTGRAY, SK_ColorGREEN };
+        paint.setShader(SkGradientShader::CreateSweep(25.f, 35.f, colors3, NULL,
+                                                      SK_ARRAY_COUNT(colors3)))->unref();
+        paint.setXfermodeMode(SkXfermode::kLighten_Mode);
+        canvas.drawOval(SkRect::MakeXYWH(-5.f, -5.f,
+                                         fBmp.width() + 10.f, fBmp.height() + 10.f), paint);
+    }
+
+    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 = GrLockAndRefCachedBitmapTexture(context, fBmp, NULL);
+        if (NULL == texture) {
+            return;
+        }
+
+        static const SkScalar kDrawPad = 10.f;
+        static const SkScalar kTestPad = 10.f;
+
+        SkTArray<SkMatrix> textureMatrices;
+        textureMatrices.push_back().setIDiv(texture->width(), texture->height());
+        textureMatrices.push_back() = textureMatrices[0];
+        textureMatrices.back().postScale(1.5f, 0.85f);
+        textureMatrices.push_back() = textureMatrices[0];
+        textureMatrices.back().preRotate(45.f, texture->width() / 2.f, texture->height() / 2.f);
+
+        const SkIRect texelDomains[] = {
+            SkIRect::MakeWH(fBmp.width(), fBmp.height()),
+            SkIRect::MakeXYWH(fBmp.width() / 4,
+                              fBmp.height() / 4,
+                              fBmp.width() / 2,
+                              fBmp.height() / 2),
+        };
+
+        SkRect renderRect = SkRect::MakeWH(SkIntToScalar(fBmp.width()),
+                                           SkIntToScalar(fBmp.height()));
+        renderRect.outset(kDrawPad, kDrawPad);
+
+        SkScalar y = kDrawPad + kTestPad;
+        for (int tm = 0; tm < textureMatrices.count(); ++tm) {
+            for (size_t d = 0; d < SK_ARRAY_COUNT(texelDomains); ++d) {
+                SkScalar x = kDrawPad + kTestPad;
+                for (int m = 0; m < GrTextureDomain::kModeCount; ++m) {
+                    GrTextureDomain::Mode mode = (GrTextureDomain::Mode) m;
+                    SkAutoTUnref<GrEffectRef> effect(
+                        GrTextureDomainEffect::Create(texture, textureMatrices[tm],
+                                                GrTextureDomain::MakeTexelDomain(texture,
+                                                                                texelDomains[d]),
+                                                mode, GrTextureParams::kNone_FilterMode));
+
+                    if (!effect) {
+                        continue;
+                    }
+                    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;
+                }
+                y += renderRect.height() + kTestPad;
+            }
+        }
+        GrUnlockAndUnrefCachedBitmapTexture(texture);
+    }
+
+private:
+    SkBitmap fBmp;
+
+    typedef GM INHERITED;
+};
+
+DEF_GM( return SkNEW(TextureDomainEffect); )
+}
+
+#endif