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      1 /*
      2  * Copyright 2011 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 "SkColorPriv.h"
     11 #include "SkShader.h"
     12 
     13 /*
     14  *  Want to ensure that our bitmap sampler (in bitmap shader) keeps plenty of
     15  *  precision when scaling very large images (where the dx might get very small.
     16  */
     17 
     18 #define W   257
     19 #define H   161
     20 
     21 class GiantBitmapGM : public skiagm::GM {
     22     SkBitmap* fBM;
     23     SkShader::TileMode fMode;
     24     bool fDoFilter;
     25     bool fDoRotate;
     26 
     27     const SkBitmap& getBitmap() {
     28         if (NULL == fBM) {
     29             fBM = new SkBitmap;
     30             fBM->allocN32Pixels(W, H);
     31             fBM->eraseColor(SK_ColorWHITE);
     32 
     33             const SkColor colors[] = {
     34                 SK_ColorBLUE, SK_ColorRED, SK_ColorBLACK, SK_ColorGREEN
     35             };
     36 
     37             SkCanvas canvas(*fBM);
     38             SkPaint paint;
     39             paint.setAntiAlias(true);
     40             paint.setStrokeWidth(SkIntToScalar(20));
     41 
     42 #if 0
     43             for (int y = -H*2; y < H; y += 50) {
     44                 SkScalar yy = SkIntToScalar(y);
     45                 paint.setColor(colors[y/50 & 0x3]);
     46                 canvas.drawLine(0, yy, SkIntToScalar(W), yy + SkIntToScalar(W),
     47                                 paint);
     48             }
     49 #else
     50             for (int x = -W; x < W; x += 60) {
     51                 paint.setColor(colors[x/60 & 0x3]);
     52 
     53                 SkScalar xx = SkIntToScalar(x);
     54                 canvas.drawLine(xx, 0, xx, SkIntToScalar(H),
     55                                 paint);
     56             }
     57 #endif
     58         }
     59         return *fBM;
     60     }
     61 
     62 public:
     63     GiantBitmapGM(SkShader::TileMode mode, bool doFilter, bool doRotate) : fBM(NULL) {
     64         fMode = mode;
     65         fDoFilter = doFilter;
     66         fDoRotate = doRotate;
     67     }
     68 
     69     virtual ~GiantBitmapGM() {
     70         SkDELETE(fBM);
     71     }
     72 
     73 protected:
     74     virtual uint32_t onGetFlags() const SK_OVERRIDE {
     75         if (fDoFilter && fDoRotate && fMode != SkShader::kClamp_TileMode) {
     76             return kSkipTiled_Flag;
     77         }
     78         return 0;
     79     }
     80 
     81     virtual SkString onShortName() {
     82         SkString str("giantbitmap_");
     83         switch (fMode) {
     84             case SkShader::kClamp_TileMode:
     85                 str.append("clamp");
     86                 break;
     87             case SkShader::kRepeat_TileMode:
     88                 str.append("repeat");
     89                 break;
     90             case SkShader::kMirror_TileMode:
     91                 str.append("mirror");
     92                 break;
     93             default:
     94                 break;
     95         }
     96         str.append(fDoFilter ? "_bilerp" : "_point");
     97         str.append(fDoRotate ? "_rotate" : "_scale");
     98         return str;
     99     }
    100 
    101     virtual SkISize onISize() { return SkISize::Make(640, 480); }
    102 
    103     virtual void onDraw(SkCanvas* canvas) {
    104         SkPaint paint;
    105 
    106         SkMatrix m;
    107         if (fDoRotate) {
    108 //            m.setRotate(SkIntToScalar(30), 0, 0);
    109             m.setSkew(SK_Scalar1, 0, 0, 0);
    110 //            m.postScale(2*SK_Scalar1/3, 2*SK_Scalar1/3);
    111         } else {
    112             SkScalar scale = 11*SK_Scalar1/12;
    113             m.setScale(scale, scale);
    114         }
    115         SkShader* s = SkShader::CreateBitmapShader(getBitmap(), fMode, fMode, &m);
    116 
    117         paint.setShader(s)->unref();
    118         paint.setFilterLevel(fDoFilter ? SkPaint::kLow_FilterLevel : SkPaint::kNone_FilterLevel);
    119 
    120         canvas->translate(SkIntToScalar(50), SkIntToScalar(50));
    121 
    122 //        SkRect r = SkRect::MakeXYWH(-50, -50, 32, 16);
    123 //        canvas->drawRect(r, paint); return;
    124         canvas->drawPaint(paint);
    125     }
    126 
    127 private:
    128     typedef GM INHERITED;
    129 };
    130 
    131 ///////////////////////////////////////////////////////////////////////////////
    132 
    133 static skiagm::GM* G000(void*) { return new GiantBitmapGM(SkShader::kClamp_TileMode, false, false); }
    134 static skiagm::GM* G100(void*) { return new GiantBitmapGM(SkShader::kRepeat_TileMode, false, false); }
    135 static skiagm::GM* G200(void*) { return new GiantBitmapGM(SkShader::kMirror_TileMode, false, false); }
    136 static skiagm::GM* G010(void*) { return new GiantBitmapGM(SkShader::kClamp_TileMode, true, false); }
    137 static skiagm::GM* G110(void*) { return new GiantBitmapGM(SkShader::kRepeat_TileMode, true, false); }
    138 static skiagm::GM* G210(void*) { return new GiantBitmapGM(SkShader::kMirror_TileMode, true, false); }
    139 
    140 static skiagm::GM* G001(void*) { return new GiantBitmapGM(SkShader::kClamp_TileMode, false, true); }
    141 static skiagm::GM* G101(void*) { return new GiantBitmapGM(SkShader::kRepeat_TileMode, false, true); }
    142 static skiagm::GM* G201(void*) { return new GiantBitmapGM(SkShader::kMirror_TileMode, false, true); }
    143 static skiagm::GM* G011(void*) { return new GiantBitmapGM(SkShader::kClamp_TileMode, true, true); }
    144 static skiagm::GM* G111(void*) { return new GiantBitmapGM(SkShader::kRepeat_TileMode, true, true); }
    145 static skiagm::GM* G211(void*) { return new GiantBitmapGM(SkShader::kMirror_TileMode, true, true); }
    146 
    147 static skiagm::GMRegistry reg000(G000);
    148 static skiagm::GMRegistry reg100(G100);
    149 static skiagm::GMRegistry reg200(G200);
    150 static skiagm::GMRegistry reg010(G010);
    151 static skiagm::GMRegistry reg110(G110);
    152 static skiagm::GMRegistry reg210(G210);
    153 
    154 static skiagm::GMRegistry reg001(G001);
    155 static skiagm::GMRegistry reg101(G101);
    156 static skiagm::GMRegistry reg201(G201);
    157 static skiagm::GMRegistry reg011(G011);
    158 static skiagm::GMRegistry reg111(G111);
    159 static skiagm::GMRegistry reg211(G211);
    160