SkPatch abstraction

gm/patch.cpp

+
+/*
+ * 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 "SkPatch.h"
+#include <stdio.h>
+
+namespace skiagm {
+/**
+ * This GM draws a SkPatch.
+ */
+class SkPatchGM : public GM {
+public:
+    SkPatchGM() {
+        this->setBGColor(0xFFFFFFFF);
+    }
+
+protected:
+    virtual SkString onShortName() SK_OVERRIDE {
+        return SkString("skpatch");
+    }
+
+    virtual SkISize onISize() SK_OVERRIDE {
+        return SkISize::Make(800, 800);
+    }
+
+    virtual uint32_t onGetFlags() const SK_OVERRIDE {
+        // This is a GPU-specific GM.

[dandov, 2014/07/22 18:00:30]

The GM is not GPU-specific anymore, should I return 0?

+        return kGPUOnly_Flag;
+    }
+
+
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+
+        SkPaint paint;
+        SkColor colors[4] = {
+            SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorCYAN
+        };
+        SkPoint points[] = {
+            {100,100}, {130,50}, {500,70}, {650,60},
+            {110,590}, {140,550}, {515,595}, {600,700},
+            {70,150}, {125,400},
+            {350,125}, {490,555}
+        };
+
+        SkPatch coons(points, &colors, 10);
+        coons.setData();
+
+        canvas->drawVertices(SkCanvas::kTriangles_VertexMode,coons.getVertexCount(),
+            coons.getPoints(), coons.getTexCoords(), coons.getColors(), NULL, coons.getIndices(),
+            coons.getIndexCount(), paint);
+
+        //draw control points
+        canvas->drawPoints(SkCanvas::kLines_PointMode, 4, coons.getBottomPoints(), paint);
+        canvas->drawPoints(SkCanvas::kLines_PointMode, 4, coons.getTopPoints(), paint);
+        canvas->drawPoints(SkCanvas::kLines_PointMode, 4, coons.getLeftPoints(), paint);
+        canvas->drawPoints(SkCanvas::kLines_PointMode, 4, coons.getRightPoints(), paint);
+
+        paint.setStrokeWidth(5);
+        paint.setColor(SK_ColorRED);
+
+        canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, coons.getBottomPoints(), paint);
+        canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, coons.getTopPoints(), paint);
+        canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, coons.getLeftPoints(), paint);
+        canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, coons.getRightPoints(), paint);
+    }
+
+private:
+    typedef GM INHERITED;
+};
+
+DEF_GM( return SkNEW(SkPatchGM); )
+
+}
+
+#endif