src/third_party/skia/gm/pictureshadertile.cpp

   1 /*
   2  * Copyright 2014 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
  10 #include "SkPaint.h"
  11 #include "SkPicture.h"
  12 #include "SkPictureRecorder.h"
  13 #include "SkShader.h"
  14
  15 static const SkScalar kPictureSize = SK_Scalar1;
  16 static const SkScalar kFillSize = 100;
  17 static const unsigned kRowSize = 6;
  18
  19 static const struct {
  20     SkScalar x, y, w, h;
  21     SkScalar offsetX, offsetY;
  22 } tiles[] = {
  23     {      0,      0,    1,    1,      0,    0 },
  24     {   0.5f,   0.5f,    1,    1,      0,    0 },
  25     {  -0.5f,  -0.5f,    1,    1,      0,    0 },
  26
  27     {      0,      0, 1.5f, 1.5f,      0,    0 },
  28     {   0.5f,   0.5f, 1.5f, 1.5f,      0,    0 },
  29     {  -0.5f,  -0.5f, 1.5f, 1.5f,      0,    0 },
  30
  31     {      0,      0, 0.5f, 0.5f,      0,    0 },
  32     { -0.25f, -0.25f, 0.5f, 0.5f,      0,    0 },
  33     {  0.25f,  0.25f, 0.5f, 0.5f,      0,    0 },
  34
  35     {      0,      0,    1,    1,   0.5f, 0.5f },
  36     {   0.5f,   0.5f,    1,    1,   0.5f, 0.5f },
  37     {  -0.5f,  -0.5f,    1,    1,   0.5f, 0.5f },
  38
  39     {      0,      0, 1.5f, 1.5f,   0.5f, 0.5f },
  40     {   0.5f,   0.5f, 1.5f, 1.5f,   0.5f, 0.5f },
  41     {  -0.5f,  -0.5f, 1.5f, 1.5f,   0.5f, 0.5f },
  42
  43     {      0,      0, 1.5f,    1,      0,    0 },
  44     {   0.5f,   0.5f, 1.5f,    1,      0,    0 },
  45     {  -0.5f,  -0.5f, 1.5f,    1,      0,    0 },
  46
  47     {      0,      0, 0.5f,    1,      0,    0 },
  48     { -0.25f, -0.25f, 0.5f,    1,      0,    0 },
  49     {  0.25f,  0.25f, 0.5f,    1,      0,    0 },
  50
  51     {      0,      0,    1, 1.5f,      0,    0 },
  52     {   0.5f,   0.5f,    1, 1.5f,      0,    0 },
  53     {  -0.5f,  -0.5f,    1, 1.5f,      0,    0 },
  54
  55     {      0,      0,    1, 0.5f,      0,    0 },
  56     { -0.25f, -0.25f,    1, 0.5f,      0,    0 },
  57     {  0.25f,  0.25f,    1, 0.5f,      0,    0 },
  58 };
  59
  60 class PictureShaderTileGM : public skiagm::GM {
  61 public:
  62     PictureShaderTileGM() {
  63         SkPictureRecorder recorder;
  64         SkCanvas* pictureCanvas = recorder.beginRecording(kPictureSize, kPictureSize, NULL, 0);
  65         drawScene(pictureCanvas, kPictureSize);
  66         SkAutoTUnref<SkPicture> picture(recorder.endRecording());
  67
  68         for (unsigned i = 0; i < SK_ARRAY_COUNT(tiles); ++i) {
  69             SkRect tile = SkRect::MakeXYWH(tiles[i].x * kPictureSize,
  70                                            tiles[i].y * kPictureSize,
  71                                            tiles[i].w * kPictureSize,
  72                                            tiles[i].h * kPictureSize);
  73             SkMatrix localMatrix;
  74             localMatrix.setTranslate(tiles[i].offsetX * kPictureSize,
  75                                      tiles[i].offsetY * kPictureSize);
  76             localMatrix.postScale(kFillSize / (2 * kPictureSize),
  77                                   kFillSize / (2 * kPictureSize));
  78             fShaders[i].reset(SkShader::CreatePictureShader(picture,
  79                               SkShader::kRepeat_TileMode,
  80                               SkShader::kRepeat_TileMode,
  81                               &localMatrix,
  82                               &tile));
  83         }
  84     }
  85
  86 protected:
  87     virtual uint32_t onGetFlags() const SK_OVERRIDE {
  88         return kSkipTiled_Flag;
  89     }
  90
  91     virtual SkString onShortName() SK_OVERRIDE {
  92         return SkString("pictureshadertile");
  93     }
  94
  95     virtual SkISize onISize() SK_OVERRIDE {
  96         return SkISize::Make(800, 600);
  97     }
  98
  99     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
 100         canvas->clear(SK_ColorBLACK);
 101
 102         SkPaint paint;
 103         paint.setStyle(SkPaint::kFill_Style);
 104
 105         for (unsigned i = 0; i < SK_ARRAY_COUNT(fShaders); ++i) {
 106             paint.setShader(fShaders[i]);
 107
 108             canvas->save();
 109             canvas->translate((i % kRowSize) * kFillSize * 1.1f,
 110                               (i / kRowSize) * kFillSize * 1.1f);
 111             canvas->drawRect(SkRect::MakeWH(kFillSize, kFillSize), paint);
 112             canvas->restore();
 113         }
 114     }
 115
 116 private:
 117     void drawScene(SkCanvas* canvas, SkScalar pictureSize) {
 118         canvas->clear(SK_ColorWHITE);
 119
 120         SkPaint paint;
 121         paint.setColor(SK_ColorGREEN);
 122         paint.setStyle(SkPaint::kFill_Style);
 123         paint.setAntiAlias(true);
 124
 125         canvas->drawCircle(pictureSize / 4, pictureSize / 4, pictureSize / 4, paint);
 126         canvas->drawRect(SkRect::MakeXYWH(pictureSize / 2, pictureSize / 2,
 127                                           pictureSize / 2, pictureSize / 2), paint);
 128
 129         paint.setColor(SK_ColorRED);
 130         canvas->drawLine(pictureSize / 2, pictureSize * 1 / 3,
 131                          pictureSize / 2, pictureSize * 2 / 3, paint);
 132         canvas->drawLine(pictureSize * 1 / 3, pictureSize / 2,
 133                          pictureSize * 2 / 3, pictureSize / 2, paint);
 134
 135         paint.setColor(SK_ColorBLACK);
 136         paint.setStyle(SkPaint::kStroke_Style);
 137         canvas->drawRect(SkRect::MakeWH(pictureSize, pictureSize), paint);
 138     }
 139
 140     SkAutoTUnref<SkShader> fShaders[SK_ARRAY_COUNT(tiles)];
 141
 142     typedef GM INHERITED;
 143 };
 144
 145 DEF_GM( return SkNEW(PictureShaderTileGM); )