src/third_party/skia/samplecode/SampleTiling.cpp

   1
   2 /*
   3  * Copyright 2011 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 "SampleCode.h"
   9 #include "SkView.h"
  10 #include "SkCanvas.h"
  11 #include "SkPaint.h"
  12 #include "SkPath.h"
  13 #include "SkPictureRecorder.h"
  14 #include "SkRegion.h"
  15 #include "SkShader.h"
  16 #include "SkUtils.h"
  17 #include "SkColorPriv.h"
  18 #include "SkColorFilter.h"
  19 #include "SkPicture.h"
  20 #include "SkTypeface.h"
  21
  22 // effects
  23 #include "SkGradientShader.h"
  24 #include "SkBlurMask.h"
  25 #include "SkBlurDrawLooper.h"
  26
  27 static void makebm(SkBitmap* bm, SkColorType ct, int w, int h) {
  28     bm->allocPixels(SkImageInfo::Make(w, h, ct, kPremul_SkAlphaType));
  29     bm->eraseColor(SK_ColorTRANSPARENT);
  30
  31     SkCanvas    canvas(*bm);
  32     SkPoint     pts[] = { { 0, 0 }, { SkIntToScalar(w), SkIntToScalar(h) } };
  33     SkColor     colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
  34     SkScalar    pos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
  35     SkPaint     paint;
  36
  37     paint.setDither(true);
  38     paint.setShader(SkGradientShader::CreateLinear(pts, colors, pos,
  39                 SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode))->unref();
  40     canvas.drawPaint(paint);
  41 }
  42
  43 static void setup(SkPaint* paint, const SkBitmap& bm, bool filter,
  44                   SkShader::TileMode tmx, SkShader::TileMode tmy) {
  45     SkShader* shader = SkShader::CreateBitmapShader(bm, tmx, tmy);
  46     paint->setShader(shader)->unref();
  47     paint->setFilterLevel(filter ? SkPaint::kLow_FilterLevel : SkPaint::kNone_FilterLevel);
  48 }
  49
  50 static const SkColorType gColorTypes[] = {
  51     kN32_SkColorType,
  52     kRGB_565_SkColorType,
  53 };
  54 static const int gWidth = 32;
  55 static const int gHeight = 32;
  56
  57 class TilingView : public SampleView {
  58     SkAutoTUnref<SkPicture>        fTextPicture;
  59     SkAutoTUnref<SkBlurDrawLooper> fLooper;
  60 public:
  61     TilingView()
  62             : fLooper(SkBlurDrawLooper::Create(0x88000000,
  63                                                SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(1)),
  64                                                SkIntToScalar(2), SkIntToScalar(2))) {
  65         for (size_t i = 0; i < SK_ARRAY_COUNT(gColorTypes); i++) {
  66             makebm(&fTexture[i], gColorTypes[i], gWidth, gHeight);
  67         }
  68     }
  69
  70     virtual ~TilingView() {
  71     }
  72
  73     SkBitmap    fTexture[SK_ARRAY_COUNT(gColorTypes)];
  74
  75 protected:
  76     // overrides from SkEventSink
  77     virtual bool onQuery(SkEvent* evt) {
  78         if (SampleCode::TitleQ(*evt)) {
  79             SampleCode::TitleR(evt, "Tiling");
  80             return true;
  81         }
  82         return this->INHERITED::onQuery(evt);
  83     }
  84
  85     virtual void onDrawContent(SkCanvas* canvas) {
  86         SkRect r = { 0, 0, SkIntToScalar(gWidth*2), SkIntToScalar(gHeight*2) };
  87
  88         static const char* gConfigNames[] = { "8888", "565", "4444" };
  89
  90         static const bool           gFilters[] = { false, true };
  91         static const char*          gFilterNames[] = {     "point",                     "bilinear" };
  92
  93         static const SkShader::TileMode gModes[] = { SkShader::kClamp_TileMode, SkShader::kRepeat_TileMode, SkShader::kMirror_TileMode };
  94         static const char*          gModeNames[] = {    "C",                    "R",                   "M" };
  95
  96         SkScalar y = SkIntToScalar(24);
  97         SkScalar x = SkIntToScalar(10);
  98
  99         SkPictureRecorder recorder;
 100         SkCanvas* textCanvas = NULL;
 101         if (NULL == fTextPicture) {
 102             textCanvas = recorder.beginRecording(1000, 1000, NULL, 0);
 103         }
 104
 105         if (NULL != textCanvas) {
 106             for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
 107                 for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++) {
 108                     SkPaint p;
 109                     SkString str;
 110                     p.setAntiAlias(true);
 111                     p.setDither(true);
 112                     p.setLooper(fLooper);
 113                     str.printf("[%s,%s]", gModeNames[kx], gModeNames[ky]);
 114
 115                     p.setTextAlign(SkPaint::kCenter_Align);
 116                     textCanvas->drawText(str.c_str(), str.size(), x + r.width()/2, y, p);
 117
 118                     x += r.width() * 4 / 3;
 119                 }
 120             }
 121         }
 122
 123         y += SkIntToScalar(16);
 124
 125         for (size_t i = 0; i < SK_ARRAY_COUNT(gColorTypes); i++) {
 126             for (size_t j = 0; j < SK_ARRAY_COUNT(gFilters); j++) {
 127                 x = SkIntToScalar(10);
 128                 for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
 129                     for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++) {
 130                         SkPaint paint;
 131                         setup(&paint, fTexture[i], gFilters[j], gModes[kx], gModes[ky]);
 132                         paint.setDither(true);
 133
 134                         canvas->save();
 135                         canvas->translate(x, y);
 136                         canvas->drawRect(r, paint);
 137                         canvas->restore();
 138
 139                         x += r.width() * 4 / 3;
 140                     }
 141                 }
 142                 if (NULL != textCanvas) {
 143                     SkPaint p;
 144                     SkString str;
 145                     p.setAntiAlias(true);
 146                     p.setLooper(fLooper);
 147                     str.printf("%s, %s", gConfigNames[i], gFilterNames[j]);
 148                     textCanvas->drawText(str.c_str(), str.size(), x, y + r.height() * 2 / 3, p);
 149                 }
 150
 151                 y += r.height() * 4 / 3;
 152             }
 153         }
 154
 155         if (NULL != textCanvas) {
 156             SkASSERT(NULL == fTextPicture);
 157             fTextPicture.reset(recorder.endRecording());
 158         }
 159
 160         SkASSERT(NULL != fTextPicture);
 161         canvas->drawPicture(fTextPicture);
 162     }
 163
 164 private:
 165     typedef SampleView INHERITED;
 166 };
 167
 168 //////////////////////////////////////////////////////////////////////////////
 169
 170 static SkView* MyFactory() { return new TilingView; }
 171 static SkViewRegister reg(MyFactory);