gm/downsamplebitmap.cpp

   1 /*
   2  * Copyright 2013 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 "sk_tool_utils.h"
  10
  11 #include "Resources.h"
  12 #include "SkGradientShader.h"
  13 #include "SkTypeface.h"
  14 #include "SkStream.h"
  15 #include "SkPaint.h"
  16
  17 static void make_checker(SkBitmap* bm, int size, int numChecks) {
  18     bm->allocN32Pixels(size, size);
  19     for (int y = 0; y < size; ++y) {
  20         for (int x = 0; x < size; ++x) {
  21             SkPMColor* s = bm->getAddr32(x, y);
  22             int cx = (x * numChecks) / size;
  23             int cy = (y * numChecks) / size;
  24             if ((cx+cy)%2) {
  25                 *s = 0xFFFFFFFF;
  26             } else {
  27                 *s = 0xFF000000;
  28             }
  29         }
  30     }
  31 }
  32
  33 static void setTypeface(SkPaint* paint, const char name[], SkFontStyle style) {
  34     sk_tool_utils::set_portable_typeface(paint, name, style);
  35 }
  36
  37 class DownsampleBitmapGM : public skiagm::GM {
  38 public:
  39     SkBitmap    fBM;
  40     SkString    fName;
  41     bool        fBitmapMade;
  42     SkFilterQuality fFilterQuality;
  43
  44     DownsampleBitmapGM(SkFilterQuality filterQuality)
  45         : fFilterQuality(filterQuality)
  46     {
  47         this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
  48         fBitmapMade = false;
  49     }
  50
  51     const char* filterQualityToString() {
  52         static const char *filterQualityNames[] = {
  53             "none", "low", "medium", "high"
  54         };
  55         return filterQualityNames[fFilterQuality];
  56     }
  57
  58 protected:
  59
  60     SkString onShortName() override {
  61         return fName;
  62     }
  63
  64     SkISize onISize() override {
  65         make_bitmap_wrapper();
  66         return SkISize::Make(fBM.width(), 4 * fBM.height());
  67     }
  68
  69     void make_bitmap_wrapper() {
  70         if (!fBitmapMade) {
  71             fBitmapMade = true;
  72             make_bitmap();
  73         }
  74     }
  75
  76     virtual void make_bitmap() = 0;
  77
  78     void onDraw(SkCanvas* canvas) override {
  79         make_bitmap_wrapper();
  80
  81         int curY = 0;
  82         int curHeight;
  83         float curScale = 1;
  84         do {
  85
  86             SkMatrix matrix;
  87             matrix.setScale( curScale, curScale );
  88
  89             SkPaint paint;
  90             paint.setFilterQuality(fFilterQuality);
  91
  92             canvas->save();
  93             canvas->translate(0, (SkScalar)curY);
  94             canvas->concat(matrix);
  95             canvas->drawBitmap(fBM, 0, 0, &paint);
  96             canvas->restore();
  97
  98             curHeight = (int) (fBM.height() * curScale + 2);
  99             curY += curHeight;
 100             curScale *= 0.75f;
 101         } while (curHeight >= 2 && curY < 4*fBM.height());
 102     }
 103
 104 private:
 105     typedef skiagm::GM INHERITED;
 106 };
 107
 108 class DownsampleBitmapTextGM: public DownsampleBitmapGM {
 109   public:
 110       DownsampleBitmapTextGM(float textSize, SkFilterQuality filterQuality)
 111       : INHERITED(filterQuality), fTextSize(textSize)
 112         {
 113             fName.printf("downsamplebitmap_text_%s_%.2fpt", this->filterQualityToString(), fTextSize);
 114         }
 115
 116   protected:
 117       float fTextSize;
 118
 119       void make_bitmap() override {
 120           fBM.allocN32Pixels(int(fTextSize * 8), int(fTextSize * 6));
 121           SkCanvas canvas(fBM);
 122           canvas.drawColor(SK_ColorWHITE);
 123
 124           SkPaint paint;
 125           paint.setAntiAlias(true);
 126           paint.setSubpixelText(true);
 127           paint.setTextSize(fTextSize);
 128
 129           setTypeface(&paint, "serif", SkFontStyle());
 130           canvas.drawString("Hamburgefons", fTextSize/2, 1.2f*fTextSize, paint);
 131           setTypeface(&paint, "serif", SkFontStyle::FromOldStyle(SkTypeface::kBold));
 132           canvas.drawString("Hamburgefons", fTextSize/2, 2.4f*fTextSize, paint);
 133           setTypeface(&paint, "serif", SkFontStyle::FromOldStyle(SkTypeface::kItalic));
 134           canvas.drawString("Hamburgefons", fTextSize/2, 3.6f*fTextSize, paint);
 135           setTypeface(&paint, "serif", SkFontStyle::FromOldStyle(SkTypeface::kBoldItalic));
 136           canvas.drawString("Hamburgefons", fTextSize/2, 4.8f*fTextSize, paint);
 137       }
 138   private:
 139       typedef DownsampleBitmapGM INHERITED;
 140 };
 141
 142 class DownsampleBitmapCheckerboardGM: public DownsampleBitmapGM {
 143   public:
 144       DownsampleBitmapCheckerboardGM(int size, int numChecks, SkFilterQuality filterQuality)
 145       : INHERITED(filterQuality), fSize(size), fNumChecks(numChecks)
 146         {
 147             fName.printf("downsamplebitmap_checkerboard_%s_%d_%d", this->filterQualityToString(), fSize, fNumChecks);
 148         }
 149
 150   protected:
 151       int fSize;
 152       int fNumChecks;
 153
 154       void make_bitmap() override {
 155           make_checker(&fBM, fSize, fNumChecks);
 156       }
 157   private:
 158       typedef DownsampleBitmapGM INHERITED;
 159 };
 160
 161 class DownsampleBitmapImageGM: public DownsampleBitmapGM {
 162   public:
 163       DownsampleBitmapImageGM(const char filename[], SkFilterQuality filterQuality)
 164       : INHERITED(filterQuality), fFilename(filename)
 165         {
 166             fName.printf("downsamplebitmap_image_%s_%s", this->filterQualityToString(), filename);
 167         }
 168
 169   protected:
 170       SkString fFilename;
 171       int fSize;
 172
 173       void make_bitmap() override {
 174         if (!GetResourceAsBitmap(fFilename.c_str(), &fBM)) {
 175             fBM.allocN32Pixels(1, 1);
 176             fBM.eraseARGB(255, 255, 0 , 0); // red == bad
 177         }
 178         fSize = fBM.height();
 179       }
 180   private:
 181       typedef DownsampleBitmapGM INHERITED;
 182 };
 183
 184 DEF_GM( return new DownsampleBitmapTextGM(72, kHigh_SkFilterQuality); )
 185 DEF_GM( return new DownsampleBitmapCheckerboardGM(512,256, kHigh_SkFilterQuality); )
 186 DEF_GM( return new DownsampleBitmapImageGM("mandrill_512.png", kHigh_SkFilterQuality); )
 187
 188 DEF_GM( return new DownsampleBitmapTextGM(72, kMedium_SkFilterQuality); )
 189 DEF_GM( return new DownsampleBitmapCheckerboardGM(512,256, kMedium_SkFilterQuality); )
 190 DEF_GM( return new DownsampleBitmapImageGM("mandrill_512.png", kMedium_SkFilterQuality); )
 191
 192 DEF_GM( return new DownsampleBitmapTextGM(72, kLow_SkFilterQuality); )
 193 DEF_GM( return new DownsampleBitmapCheckerboardGM(512,256, kLow_SkFilterQuality); )
 194 DEF_GM( return new DownsampleBitmapImageGM("mandrill_512.png", kLow_SkFilterQuality); )
 195
 196 DEF_GM( return new DownsampleBitmapTextGM(72, kNone_SkFilterQuality); )
 197 DEF_GM( return new DownsampleBitmapCheckerboardGM(512,256, kNone_SkFilterQuality); )
 198 DEF_GM( return new DownsampleBitmapImageGM("mandrill_512.png", kNone_SkFilterQuality); )