add GM to show bad banding in raster for radial gradients

gm/gradients.cpp

-
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+
 #include "gm.h"
 #include "SkGradientShader.h"
 
 namespace skiagm {
 
 struct GradData {
     int             fCount;
     const SkColor*  fColors;
     const SkScalar* fPos;
 };
@@ skipping 124 matching lines @@
                 canvas->translate(0, SkIntToScalar(120));
             }
             canvas->restore();
             canvas->translate(SkIntToScalar(120), 0);
         }
     }
 
 private:
     typedef GM INHERITED;
 };
+DEF_GM( return new GradientsGM; )
 
 // Based on the original gradient slide, but with perspective applied to the
 // gradient shaders' local matrices
 class GradientsLocalPerspectiveGM : public GM {
 public:
     GradientsLocalPerspectiveGM() {
         this->setBGColor(0xFFDDDDDD);
     }
 
 protected:
@@ skipping 35 matching lines @@
                 canvas->translate(0, SkIntToScalar(120));
             }
             canvas->restore();
             canvas->translate(SkIntToScalar(120), 0);
         }
     }
 
 private:
     typedef GM INHERITED;
 };
+DEF_GM( return new GradientsLocalPerspectiveGM; )
 
 // Based on the original gradient slide, but with perspective applied to
 // the view matrix
 class GradientsViewPerspectiveGM : public GradientsGM {
 protected:
     SkString onShortName() {
         return SkString("gradients_view_perspective");
     }
 
     virtual SkISize onISize() { return SkISize::Make(840, 500); }
 
     virtual void onDraw(SkCanvas* canvas) {
         SkMatrix perspective;
         perspective.setIdentity();
         perspective.setPerspY(SkScalarDiv(SK_Scalar1, SkIntToScalar(1000)));
         perspective.setSkewX(SkScalarDiv(SkIntToScalar(8), SkIntToScalar(25)));
         canvas->concat(perspective);
         INHERITED::onDraw(canvas);
     }
 
 private:
     typedef GradientsGM INHERITED;
 };
+DEF_GM( return new GradientsViewPerspectiveGM; )
 
 /*
  Inspired by this <canvas> javascript, where we need to detect that we are not
  solving a quadratic equation, but must instead solve a linear (since our X^2
  coefficient is 0)
 
  ctx.fillStyle = '#f00';
  ctx.fillRect(0, 0, 100, 50);
 
  var g = ctx.createRadialGradient(-80, 25, 70, 0, 25, 150);
@@ skipping 34 matching lines @@
                                                              pos, SK_ARRAY_COUNT(pos),
                                                              SkShader::kClamp_TileMode);
         SkPaint paint;
         paint.setShader(s)->unref();
         canvas->drawPaint(paint);
     }
 
 private:
     typedef GM INHERITED;
 };
+DEF_GM( return new GradientsDegenrate2PointGM; )
 
 /// Tests correctness of *optimized* codepaths in gradients.
 
 class ClampedGradientsGM : public GM {
 public:
     ClampedGradientsGM() {}
 
 protected:
     SkString onShortName() { return SkString("clamped_gradients"); }
 
@@ skipping 18 matching lines @@
             SkIntToScalar(200), gColors, NULL, 5,
             SkShader::kClamp_TileMode);
         paint.setShader(shader);
         canvas->drawRect(r, paint);
         shader->unref();
     }
 
 private:
     typedef GM INHERITED;
 };
+DEF_GM( return new ClampedGradientsGM; )
 
 /// Checks quality of large radial gradients, which may display
 /// some banding.
 
 class RadialGradientGM : public GM {
 public:
     RadialGradientGM() {}
 
 protected:
 
@@ skipping 22 matching lines @@
                                            SkShader::kClamp_TileMode);
         paint.setShader(shader)->unref();
         SkRect r = {
             0, 0, SkIntToScalar(dim.width()), SkIntToScalar(dim.height())
         };
         canvas->drawRect(r, paint);
     }
 private:
     typedef GM INHERITED;
 };
-
+DEF_GM( return new RadialGradientGM; )
 
 class RadialGradient2GM : public GM {
 public:
     RadialGradient2GM() {}
 
 protected:
 
     SkString onShortName() override { return SkString("radial_gradient2"); }
     SkISize onISize() override { return SkISize::Make(800, 400); }
     void drawBG(SkCanvas* canvas) {
@@ skipping 43 matching lines @@
             canvas->drawCircle(cx, cy, radius, paint3);
             canvas->drawCircle(cx, cy, radius, paint2);
 
             canvas->translate(400, 0);
         }
     }
 
 private:
     typedef GM INHERITED;
 };
+DEF_GM( return new RadialGradient2GM; )
 
-///////////////////////////////////////////////////////////////////////////////
+// Shallow radial (shows banding on raster)
+class RadialGradient3GM : public GM {
+    SkAutoTUnref<SkShader> fShader;
 
-static GM* MyFactory(void*) { return new GradientsGM; }
-static GMRegistry reg(MyFactory);
+protected:
+    SkString onShortName() override { return SkString("radial_gradient3"); }
 
-static GM* MyFactory2(void*) { return new GradientsDegenrate2PointGM; }
-static GMRegistry reg2(MyFactory2);
+    SkISize onISize() override { return SkISize::Make(500, 500); }
 
-static GM* MyFactory3(void*) { return new ClampedGradientsGM; }
-static GMRegistry reg3(MyFactory3);
+    bool runAsBench() const override { return true; }
 
-static GM* MyFactory4(void*) { return new RadialGradientGM; }
-static GMRegistry reg4(MyFactory4);
+    void onOnceBeforeDraw() override {
+        const SkPoint center = { 0, 0 };
+        const SkScalar kRadius = 3000;
+        const SkColor gColors[] = { 0xFFFFFFFF, 0xFF000000 };
+        fShader.reset(SkGradientShader::CreateRadial(center, kRadius, gColors, NULL, 2,

[robertphillips, 2015/04/23 18:48:18]

missing space ?

+                                                    SkShader::kClamp_TileMode));
+    }
 
-static GM* MyFactory5(void*) { return new GradientsLocalPerspectiveGM; }
-static GMRegistry reg5(MyFactory5);
+    void onDraw(SkCanvas* canvas) override {
+        SkPaint paint;
+        paint.setShader(fShader);
+        canvas->drawRect(SkRect::MakeWH(500, 500), paint);
+    }
+    
+private:
+    typedef GM INHERITED;
+};
+DEF_GM( return new RadialGradient3GM; )
 
-static GM* MyFactory6(void*) { return new GradientsViewPerspectiveGM; }
-static GMRegistry reg6(MyFactory6);
-
-static GM* MyFactory7(void*) { return new RadialGradient2GM; }
-static GMRegistry reg7(MyFactory7);
 }