gm/badpaint.cpp

   1 /*
   2  * Copyright 2015 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7
   8 #include "gm.h"
   9 #include "SkCanvas.h"
  10 #include "SkShader.h"
  11
  12
  13 /** This GM draws with invalid paints. It should draw nothing other than the background. */
  14 class BadPaintGM : public skiagm::GM {
  15  public:
  16     BadPaintGM() {}
  17
  18 protected:
  19     SkString onShortName() override { return SkString("badpaint"); }
  20
  21     SkISize onISize() override { return SkISize::Make(100, 100); }
  22
  23     void onOnceBeforeDraw() override {
  24         SkBitmap emptyBmp;
  25
  26         SkBitmap blueBmp;
  27         blueBmp.allocN32Pixels(10, 10);
  28         blueBmp.eraseColor(SK_ColorBLUE);
  29
  30         SkMatrix badMatrix;
  31         badMatrix.setAll(0, 0, 0, 0, 0, 0, 0, 0, 0);
  32
  33         // Empty bitmap.
  34         fPaints.push_back().setColor(SK_ColorGREEN);
  35         fPaints.back().setShader(SkShader::MakeBitmapShader(emptyBmp, SkShader::kClamp_TileMode,
  36                                                             SkShader::kClamp_TileMode));
  37
  38         // Non-invertible local matrix.
  39         fPaints.push_back().setColor(SK_ColorGREEN);
  40         fPaints.back().setShader(SkShader::MakeBitmapShader(blueBmp, SkShader::kClamp_TileMode,
  41                                                             SkShader::kClamp_TileMode, &badMatrix));
  42     }
  43
  44     void onDraw(SkCanvas* canvas) override {
  45         SkRect rect = SkRect::MakeXYWH(10, 10, 80, 80);
  46         for (int i = 0; i < fPaints.count(); ++i) {
  47             canvas->drawRect(rect, fPaints[i]);
  48         }
  49     }
  50
  51 private:
  52     SkTArray<SkPaint> fPaints;
  53
  54     typedef skiagm::GM INHERITED;
  55 };
  56
  57 /////////////////////////////////////////////////////////////////////////////////////
  58
  59 DEF_GM(return new BadPaintGM;)