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:
BadPaintGM()16     BadPaintGM() {}
17 
18 protected:
onShortName()19     SkString onShortName() override { return SkString("badpaint"); }
20 
onISize()21     SkISize onISize() override { return SkISize::Make(100, 100); }
22 
onOnceBeforeDraw()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::CreateBitmapShader(emptyBmp, SkShader::kClamp_TileMode,
36                                                               SkShader::kClamp_TileMode))->unref();
37 
38         // Non-invertible local matrix.
39         fPaints.push_back().setColor(SK_ColorGREEN);
40         fPaints.back().setShader(SkShader::CreateBitmapShader(blueBmp, SkShader::kClamp_TileMode,
41                                                               SkShader::kClamp_TileMode,
42                                                               &badMatrix))->unref();
43     }
44 
onDraw(SkCanvas * canvas)45     void onDraw(SkCanvas* canvas) override {
46         SkRect rect = SkRect::MakeXYWH(10, 10, 80, 80);
47         for (int i = 0; i < fPaints.count(); ++i) {
48             canvas->drawRect(rect, fPaints[i]);
49         }
50     }
51 
52 private:
53     SkTArray<SkPaint> fPaints;
54 
55     typedef skiagm::GM INHERITED;
56 };
57 
58 /////////////////////////////////////////////////////////////////////////////////////
59 
60 DEF_GM( return SkNEW(BadPaintGM); )
61