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| 1 |
| 2 /* |
| 3 * Copyright 2013 Google Inc. |
| 4 * |
| 5 * Use of this source code is governed by a BSD-style license that can be |
| 6 * found in the LICENSE file. |
| 7 */ |
| 8 #include "gm.h" |
| 9 |
| 10 #include "SkBitmap.h" |
| 11 #include "SkPaint.h" |
| 12 #include "SkShader.h" |
| 13 |
| 14 namespace skiagm { |
| 15 |
| 16 static void draw_bm(SkBitmap* bm) { |
| 17 SkPaint bluePaint; |
| 18 bluePaint.setColor(SK_ColorBLUE); |
| 19 |
| 20 bm->setConfig(SkBitmap::kARGB_8888_Config, 20, 20); |
| 21 bm->allocPixels(); |
| 22 bm->eraseColor(SK_ColorRED); |
| 23 |
| 24 SkCanvas canvas(*bm); |
| 25 canvas.drawCircle(10, 10, 5, bluePaint); |
| 26 } |
| 27 |
| 28 static void draw_mask(SkBitmap* bm) { |
| 29 SkPaint circlePaint; |
| 30 circlePaint.setColor(SK_ColorBLACK); |
| 31 |
| 32 bm->setConfig(SkBitmap::kA8_Config, 20, 20); |
| 33 bm->allocPixels(); |
| 34 bm->eraseColor(SK_ColorTRANSPARENT); |
| 35 |
| 36 SkCanvas canvas(*bm); |
| 37 canvas.drawCircle(10, 10, 10, circlePaint); |
| 38 } |
| 39 |
| 40 class BitmapShaderGM : public GM { |
| 41 public: |
| 42 |
| 43 BitmapShaderGM() { |
| 44 this->setBGColor(SK_ColorGRAY); |
| 45 draw_bm(&fBitmap); |
| 46 draw_mask(&fMask); |
| 47 } |
| 48 |
| 49 protected: |
| 50 virtual SkString onShortName() { |
| 51 return SkString("bitmapshaders"); |
| 52 } |
| 53 |
| 54 virtual SkISize onISize() { |
| 55 return make_isize(75, 100); |
| 56 } |
| 57 |
| 58 virtual void onDraw(SkCanvas* canvas) { |
| 59 SkShader* shader = SkShader::CreateBitmapShader(fBitmap, |
| 60 SkShader::kClamp
_TileMode, |
| 61 SkShader::kClamp
_TileMode); |
| 62 SkPaint paint; |
| 63 paint.setShader(shader); |
| 64 // release the shader ref as the paint now holds a reference |
| 65 shader->unref(); |
| 66 |
| 67 // draw the shader with a bitmap mask |
| 68 canvas->drawBitmap(fMask, 0, 0, &paint); |
| 69 canvas->drawBitmap(fMask, 30, 0, &paint); |
| 70 |
| 71 canvas->translate(0, 25); |
| 72 |
| 73 // draw the shader with standard geometry |
| 74 canvas->drawCircle(10, 10, 10, paint); |
| 75 canvas->drawCircle(40, 10, 10, paint); // no blue circle expected |
| 76 |
| 77 canvas->translate(0, 25); |
| 78 |
| 79 shader = SkShader::CreateBitmapShader(fMask, |
| 80 SkShader::kRepeat_TileMode, |
| 81 SkShader::kRepeat_TileMode); |
| 82 paint.setShader(shader); |
| 83 paint.setColor(SK_ColorRED); |
| 84 shader->unref(); |
| 85 |
| 86 // draw the mask using the shader and a color |
| 87 canvas->drawRect(SkRect::MakeXYWH(0, 0, 20, 20), paint); |
| 88 canvas->drawRect(SkRect::MakeXYWH(30, 0, 20, 20), paint); |
| 89 } |
| 90 |
| 91 private: |
| 92 SkBitmap fBitmap; |
| 93 SkBitmap fMask; |
| 94 |
| 95 typedef GM INHERITED; |
| 96 }; |
| 97 |
| 98 ////////////////////////////////////////////////////////////////////////////// |
| 99 |
| 100 static GM* MyFactory(void*) { return new BitmapShaderGM; } |
| 101 static GMRegistry reg(MyFactory); |
| 102 |
| 103 } |
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