gm/variedtext.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 #include "SkCanvas.h"
  10 #include "SkPath.h"
  11 #include "SkTypeface.h"
  12 #include "SkRandom.h"
  13
  14 /**
  15  * Draws text with random parameters. The text draws each get their own clip rect. It is also
  16  * used as a bench to measure how well the GPU backend batches text draws.
  17  */
  18
  19 class VariedTextGM : public skiagm::GM {
  20 public:
  21     VariedTextGM(bool effectiveClip, bool lcd)
  22         : fEffectiveClip(effectiveClip)
  23         , fLCD(lcd) {
  24         memset(fTypefacesToUnref, 0, sizeof(fTypefacesToUnref));
  25     }
  26
  27     ~VariedTextGM() {
  28         for (size_t i = 0; i < SK_ARRAY_COUNT(fTypefacesToUnref); ++i) {
  29             SkSafeUnref(fTypefacesToUnref[i]);
  30         }
  31     }
  32
  33 protected:
  34     SkString onShortName() SK_OVERRIDE {
  35         SkString name("varied_text");
  36         if (fEffectiveClip) {
  37             name.append("_clipped");
  38         } else {
  39             name.append("_ignorable_clip");
  40         }
  41         if (fLCD) {
  42             name.append("_lcd");
  43         } else {
  44             name.append("_no_lcd");
  45         }
  46         return name;
  47     }
  48
  49     SkISize onISize() SK_OVERRIDE {
  50         return SkISize::Make(640, 480);
  51     }
  52
  53     void onOnceBeforeDraw() SK_OVERRIDE {
  54         fPaint.setAntiAlias(true);
  55         fPaint.setLCDRenderText(fLCD);
  56
  57         SkISize size = this->getISize();
  58         SkScalar w = SkIntToScalar(size.fWidth);
  59         SkScalar h = SkIntToScalar(size.fHeight);
  60
  61         SK_COMPILE_ASSERT(4 == SK_ARRAY_COUNT(fTypefacesToUnref), typeface_cnt);
  62         fTypefacesToUnref[0] = sk_tool_utils::create_portable_typeface("sans-serif", SkTypeface::kNormal);
  63         fTypefacesToUnref[1] = sk_tool_utils::create_portable_typeface("sans-serif", SkTypeface::kBold);
  64         fTypefacesToUnref[2] = sk_tool_utils::create_portable_typeface("serif", SkTypeface::kNormal);
  65         fTypefacesToUnref[3] = sk_tool_utils::create_portable_typeface("serif", SkTypeface::kBold);
  66
  67         SkRandom random;
  68         for (int i = 0; i < kCnt; ++i) {
  69             int length = random.nextRangeU(kMinLength, kMaxLength);
  70             char text[kMaxLength];
  71             for (int j = 0; j < length; ++j) {
  72                 text[j] = (char)random.nextRangeU('!', 'z');
  73             }
  74             fStrings[i].set(text, length);
  75
  76             fColors[i] = random.nextU();
  77             fColors[i] |= 0xFF000000;
  78
  79             static const SkScalar kMinPtSize = 8.f;
  80             static const SkScalar kMaxPtSize = 32.f;
  81
  82             fPtSizes[i] = random.nextRangeScalar(kMinPtSize, kMaxPtSize);
  83
  84             fTypefaces[i] = fTypefacesToUnref[
  85                 random.nextULessThan(SK_ARRAY_COUNT(fTypefacesToUnref))];
  86
  87             SkRect r;
  88             fPaint.setColor(fColors[i]);
  89             fPaint.setTypeface(fTypefaces[i]);
  90             fPaint.setTextSize(fPtSizes[i]);
  91
  92             fPaint.measureText(fStrings[i].c_str(), fStrings[i].size(), &r);
  93             // safeRect is set of x,y positions where we can draw the string without hitting
  94             // the GM's border.
  95             SkRect safeRect = SkRect::MakeLTRB(-r.fLeft, -r.fTop, w - r.fRight, h - r.fBottom);
  96             if (safeRect.isEmpty()) {
  97                 // If we don't fit then just don't worry about how we get cliped to the device
  98                 // border.
  99                 safeRect = SkRect::MakeWH(w, h);
 100             }
 101             fPositions[i].fX = random.nextRangeScalar(safeRect.fLeft, safeRect.fRight);
 102             fPositions[i].fY = random.nextRangeScalar(safeRect.fTop, safeRect.fBottom);
 103
 104             fClipRects[i] = r;
 105             fClipRects[i].offset(fPositions[i].fX, fPositions[i].fY);
 106             fClipRects[i].outset(2.f, 2.f);
 107
 108             if (fEffectiveClip) {
 109                 fClipRects[i].fRight -= 0.25f * fClipRects[i].width();
 110             }
 111         }
 112     }
 113
 114     void onDraw(SkCanvas* canvas) SK_OVERRIDE {
 115         for (int i = 0; i < kCnt; ++i) {
 116             fPaint.setColor(fColors[i]);
 117             fPaint.setTextSize(fPtSizes[i]);
 118             fPaint.setTypeface(fTypefaces[i]);
 119
 120             canvas->save();
 121                 canvas->clipRect(fClipRects[i]);
 122                 canvas->translate(fPositions[i].fX, fPositions[i].fY);
 123                 canvas->drawText(fStrings[i].c_str(), fStrings[i].size(), 0, 0, fPaint);
 124             canvas->restore();
 125         }
 126
 127         // Visualize the clips, but not in bench mode.
 128         if (kBench_Mode != this->getMode()) {
 129             SkPaint wirePaint;
 130             wirePaint.setAntiAlias(true);
 131             wirePaint.setStrokeWidth(0);
 132             wirePaint.setStyle(SkPaint::kStroke_Style);
 133             for (int i = 0; i < kCnt; ++i) {
 134                 canvas->drawRect(fClipRects[i], wirePaint);
 135             }
 136         }
 137     }
 138
 139     bool runAsBench() const SK_OVERRIDE { return true; }
 140
 141 private:
 142     static const int kCnt = 30;
 143     static const int kMinLength = 15;
 144     static const int kMaxLength = 40;
 145
 146     bool        fEffectiveClip;
 147     bool        fLCD;
 148     SkTypeface* fTypefacesToUnref[4];
 149     SkPaint     fPaint;
 150
 151     // precomputed for each text draw
 152     SkString        fStrings[kCnt];
 153     SkColor         fColors[kCnt];
 154     SkScalar        fPtSizes[kCnt];
 155     SkTypeface*     fTypefaces[kCnt];
 156     SkPoint         fPositions[kCnt];
 157     SkRect          fClipRects[kCnt];
 158
 159     typedef skiagm::GM INHERITED;
 160 };
 161
 162 DEF_GM( return SkNEW(VariedTextGM(false, false)); )
 163 DEF_GM( return SkNEW(VariedTextGM(true, false)); )
 164 DEF_GM( return SkNEW(VariedTextGM(false, true)); )
 165 DEF_GM( return SkNEW(VariedTextGM(true, true)); )