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      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 "Benchmark.h"
      9 #include "SkCanvas.h"
     10 #include "SkFontHost.h"
     11 #include "SkPaint.h"
     12 #include "SkRandom.h"
     13 #include "SkString.h"
     14 #include "SkTemplates.h"
     15 
     16 enum FontQuality {
     17     kBW,
     18     kAA,
     19     kLCD
     20 };
     21 
     22 static const char* fontQualityName(const SkPaint& paint) {
     23     if (!paint.isAntiAlias()) {
     24         return "BW";
     25     }
     26     if (paint.isLCDRenderText()) {
     27         return "LCD";
     28     }
     29     return "AA";
     30 }
     31 
     32 /*  Some considerations for performance:
     33         short -vs- long strings (measuring overhead)
     34         tiny -vs- large pointsize (measure blit -vs- overhead)
     35         1 -vs- many point sizes (measure cache lookup)
     36         normal -vs- subpixel -vs- lineartext (minor)
     37         force purge after each draw to measure scaler
     38         textencoding?
     39         text -vs- postext - pathtext
     40  */
     41 class TextBench : public Benchmark {
     42     SkPaint     fPaint;
     43     SkString    fText;
     44     SkString    fName;
     45     FontQuality fFQ;
     46     bool        fDoPos;
     47     SkPoint*    fPos;
     48 public:
     49     TextBench(const char text[], int ps,
     50               SkColor color, FontQuality fq, bool doPos = false)  {
     51         fPos = NULL;
     52         fFQ = fq;
     53         fDoPos = doPos;
     54         fText.set(text);
     55 
     56         fPaint.setAntiAlias(kBW != fq);
     57         fPaint.setLCDRenderText(kLCD == fq);
     58         fPaint.setTextSize(SkIntToScalar(ps));
     59         fPaint.setColor(color);
     60 
     61         if (doPos) {
     62             size_t len = strlen(text);
     63             SkScalar* adv = new SkScalar[len];
     64             fPaint.getTextWidths(text, len, adv);
     65             fPos = new SkPoint[len];
     66             SkScalar x = 0;
     67             for (size_t i = 0; i < len; ++i) {
     68                 fPos[i].set(x, SkIntToScalar(50));
     69                 x += adv[i];
     70             }
     71             delete[] adv;
     72         }
     73     }
     74 
     75     virtual ~TextBench() {
     76         delete[] fPos;
     77     }
     78 
     79 protected:
     80     virtual const char* onGetName() {
     81         fName.printf("text_%g", SkScalarToFloat(fPaint.getTextSize()));
     82         if (fDoPos) {
     83             fName.append("_pos");
     84         }
     85         fName.appendf("_%s", fontQualityName(fPaint));
     86         if (SK_ColorBLACK != fPaint.getColor()) {
     87             fName.appendf("_%02X", fPaint.getAlpha());
     88         } else {
     89             fName.append("_BK");
     90         }
     91         return fName.c_str();
     92     }
     93 
     94     virtual void onDraw(const int loops, SkCanvas* canvas) {
     95         const SkIPoint dim = this->getSize();
     96         SkRandom rand;
     97 
     98         SkPaint paint(fPaint);
     99         this->setupPaint(&paint);
    100         // explicitly need these
    101         paint.setColor(fPaint.getColor());
    102         paint.setAntiAlias(kBW != fFQ);
    103         paint.setLCDRenderText(kLCD == fFQ);
    104 
    105         const SkScalar x0 = SkIntToScalar(-10);
    106         const SkScalar y0 = SkIntToScalar(-10);
    107 
    108         if (fDoPos) {
    109             // realistically, the matrix is often at least translated, so we
    110             // do that since it exercises different code in drawPosText.
    111             canvas->translate(SK_Scalar1, SK_Scalar1);
    112         }
    113 
    114         for (int i = 0; i < loops; i++) {
    115             if (fDoPos) {
    116                 canvas->drawPosText(fText.c_str(), fText.size(), fPos, paint);
    117             } else {
    118                 SkScalar x = x0 + rand.nextUScalar1() * dim.fX;
    119                 SkScalar y = y0 + rand.nextUScalar1() * dim.fY;
    120                 canvas->drawText(fText.c_str(), fText.size(), x, y, paint);
    121             }
    122         }
    123     }
    124 
    125 private:
    126     typedef Benchmark INHERITED;
    127 };
    128 
    129 ///////////////////////////////////////////////////////////////////////////////
    130 
    131 #define STR     "Hamburgefons"
    132 
    133 DEF_BENCH( return new TextBench(STR, 16, 0xFF000000, kBW); )
    134 DEF_BENCH( return new TextBench(STR, 16, 0xFFFF0000, kBW); )
    135 DEF_BENCH( return new TextBench(STR, 16, 0x88FF0000, kBW); )
    136 
    137 DEF_BENCH( return new TextBench(STR, 16, 0xFF000000, kAA); )
    138 DEF_BENCH( return new TextBench(STR, 16, 0xFFFF0000, kAA); )
    139 DEF_BENCH( return new TextBench(STR, 16, 0x88FF0000, kAA); )
    140 
    141 DEF_BENCH( return new TextBench(STR, 16, 0xFF000000, kLCD); )
    142 DEF_BENCH( return new TextBench(STR, 16, 0xFFFF0000, kLCD); )
    143 DEF_BENCH( return new TextBench(STR, 16, 0x88FF0000, kLCD); )
    144 
    145 DEF_BENCH( return new TextBench(STR, 16, 0xFF000000, kAA, true); )
    146