SkPatchGrid interface (after SkPatch/SkPicture rebase).

gm/meshgradient.cpp

Index: gm/meshgradient.cpp
diff --git a/gm/meshgradient.cpp b/gm/meshgradient.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..ef3a8dc9afba27258c4dbe638af76d556c475f58
--- /dev/null
+++ b/gm/meshgradient.cpp
@@ -0,0 +1,167 @@
+
+/*
+ * 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 "SkPatchGrid.h"
+
+static void draw_control_points(SkCanvas* canvas, const SkPatch& patch) {
+    //draw control points
+    SkPaint paint;
+    SkPoint bottom[4];
+    patch.getBottomPoints(bottom);
+    SkPoint top[4];
+    patch.getTopPoints(top);
+    SkPoint left[4];
+    patch.getLeftPoints(left);
+    SkPoint right[4];
+    patch.getRightPoints(right);
+
+    paint.setColor(SK_ColorBLACK);
+    paint.setStrokeWidth(0.5);
+    SkPoint corners[4] = { bottom[0], bottom[3], top[0], top[3] };
+    canvas->drawPoints(SkCanvas::kLines_PointMode, 4, bottom, paint);
+    canvas->drawPoints(SkCanvas::kLines_PointMode, 2, bottom+1, paint);
+    canvas->drawPoints(SkCanvas::kLines_PointMode, 4, top, paint);
+    canvas->drawPoints(SkCanvas::kLines_PointMode, 4, left, paint);
+    canvas->drawPoints(SkCanvas::kLines_PointMode, 4, right, paint);
+
+    canvas->drawPoints(SkCanvas::kLines_PointMode, 2, top+1, paint);
+    canvas->drawPoints(SkCanvas::kLines_PointMode, 2, left+1, paint);
+    canvas->drawPoints(SkCanvas::kLines_PointMode, 2, right+1, paint);
+
+    paint.setStrokeWidth(2);
+
+    paint.setColor(SK_ColorRED);
+    canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, corners, paint);
+
+    paint.setColor(SK_ColorBLUE);
+    canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, bottom+1, paint);
+
+    paint.setColor(SK_ColorCYAN);
+    canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, top+1, paint);
+
+    paint.setColor(SK_ColorYELLOW);
+    canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, left+1, paint);
+
+    paint.setColor(SK_ColorGREEN);
+    canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, right+1, paint);
+}
+
+namespace skiagm {
+/**
+ * This GM draws a mesh gradient.
+ */
+class SkMeshGradientGM : public GM {
+    
+public:
+    SkMeshGradientGM() {
+        this->setBGColor(0xFFFFFFFF);
+    }
+
+protected:
+    virtual SkString onShortName() SK_OVERRIDE {
+        return SkString("mesh_gradient");
+    }
+
+    virtual SkISize onISize() SK_OVERRIDE {
+        return SkISize::Make(800, 800);
+    }
+
+    virtual uint32_t onGetFlags() const SK_OVERRIDE {
+        return kSkipTiled_Flag;
+    }
+
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+
+        SkPaint paint;
+        
+        SkPoint vertices[3][3] = {
+            {{50,50}, {150,50}, {250,50}},
+            {{50,150}, {160,140}, {250,150}},
+            {{50,250}, {170,460}, {250,250}}
+        };
+        
+        SkColor cornerColors[3][3] = {
+            {SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE},
+            {SK_ColorRED, SK_ColorBLUE, SK_ColorRED},
+            {SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE}
+        };
+        
+        SkPoint hrzCtrl[3][4] = {
+            {{75,80},{125,20},{175,50},{225,50}},
+            {{75,180},{125,120},{175,150},{225,150}},
+            {{75,250},{125,250},{175,250},{225,250}}
+        };
+        
+        SkPoint vrtCtrl[4][3] = {
+            {{50,75},{150,75},{250,75}},
+            {{50,125},{150,125},{250,125}},
+            {{50,175},{150,175},{250,175}},
+            {{50,225},{150,225},{250,225}}
+        };
+        
+        canvas->scale(5, 5);
+        SkPatchGrid grid(2, 2);
+        for (int i = 0; i<2; i++) {

[egdaniel, 2014/08/08 14:39:04]

nit: add spaces around <

[dandov, 2014/08/08 18:31:45]

Done.

+            for (int j = 0; j<2; j++) {
+                SkPoint points[12];
+                
+                //set corners
+                points[SkPatch::kTopP0_CubicCtrlPts] = vertices[i][j];
+                points[SkPatch::kTopP3_CubicCtrlPts] = vertices[i][j + 1];
+                points[SkPatch::kBottomP0_CubicCtrlPts] = vertices[i + 1][j];
+                points[SkPatch::kBottomP3_CubicCtrlPts] = vertices[i + 1][j + 1];
+                
+                points[SkPatch::kTopP1_CubicCtrlPts] = hrzCtrl[i][j * 2];
+                points[SkPatch::kTopP2_CubicCtrlPts] = hrzCtrl[i][j * 2 + 1];
+                points[SkPatch::kBottomP1_CubicCtrlPts] = hrzCtrl[i + 1][j * 2];
+                points[SkPatch::kBottomP2_CubicCtrlPts] = hrzCtrl[i + 1][j * 2 + 1];
+                
+                points[SkPatch::kLeftP1_CubicCtrlPts] = vrtCtrl[i * 2][j];
+                points[SkPatch::kLeftP2_CubicCtrlPts] = vrtCtrl[i * 2 + 1][j];
+                points[SkPatch::kRightP1_CubicCtrlPts] = vrtCtrl[i * 2][j + 1];
+                points[SkPatch::kRightP2_CubicCtrlPts] = vrtCtrl[i * 2 + 1][j + 1];
+                
+                SkColor colors[4];
+                colors[0] = cornerColors[i][j];
+                colors[1] = cornerColors[i][j + 1];
+                colors[3] = cornerColors[i + 1][j];
+                colors[2] = cornerColors[i + 1][j + 1];
+                
+                grid.setPatch(j, i, points, colors);
+            }
+        }
+        
+        grid.draw(canvas, paint);
+        SkISize dims = grid.getDimensions();
+        for (int y = 0; y < dims.height(); y++) {
+            for (int x = 0; x < dims.width(); x++) {
+                SkPatch patch;
+                grid.getPatch(x, y, &patch);
+                draw_control_points(canvas, patch);
+            }
+        }
+    }
+
+private:
+    typedef GM INHERITED;
+};
+
+DEF_GM(return SkNEW(SkMeshGradientGM); )
+
+}
+
+#endif