giantbitmap.cpp revision 05af1afd429808913683da75644e48bece12e820 
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
21class 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->setConfig(SkBitmap::kARGB_8888_Config, W, H);
31            fBM->allocPixels();
32            fBM->eraseColor(SK_ColorWHITE);
33
34            const SkColor colors[] = {
35                SK_ColorBLUE, SK_ColorRED, SK_ColorBLACK, SK_ColorGREEN
36            };
37
38            SkCanvas canvas(*fBM);
39            SkPaint paint;
40            paint.setAntiAlias(true);
41            paint.setStrokeWidth(SkIntToScalar(20));
42
43#if 0
44            for (int y = -H*2; y < H; y += 50) {
45                SkScalar yy = SkIntToScalar(y);
46                paint.setColor(colors[y/50 & 0x3]);
47                canvas.drawLine(0, yy, SkIntToScalar(W), yy + SkIntToScalar(W),
48                                paint);
49            }
50#else
51            for (int x = -W; x < W; x += 60) {
52                paint.setColor(colors[x/60 & 0x3]);
53
54                SkScalar xx = SkIntToScalar(x);
55                canvas.drawLine(xx, 0, xx, SkIntToScalar(H),
56                                paint);
57            }
58#endif
59        }
60        return *fBM;
61    }
62
63public:
64    GiantBitmapGM(SkShader::TileMode mode, bool doFilter, bool doRotate) : fBM(NULL) {
65        fMode = mode;
66        fDoFilter = doFilter;
67        fDoRotate = doRotate;
68    }
69
70    virtual ~GiantBitmapGM() {
71        SkDELETE(fBM);
72    }
73
74protected:
75    virtual SkString onShortName() {
76        SkString str("giantbitmap_");
77        switch (fMode) {
78            case SkShader::kClamp_TileMode:
79                str.append("clamp");
80                break;
81            case SkShader::kRepeat_TileMode:
82                str.append("repeat");
83                break;
84            case SkShader::kMirror_TileMode:
85                str.append("mirror");
86                break;
87            default:
88                break;
89        }
90        str.append(fDoFilter ? "_bilerp" : "_point");
91        str.append(fDoRotate ? "_rotate" : "_scale");
92        return str;
93    }
94
95    virtual SkISize onISize() { return SkISize::Make(640, 480); }
96
97    virtual void onDraw(SkCanvas* canvas) {
98        SkPaint paint;
99        SkShader* s = SkShader::CreateBitmapShader(getBitmap(), fMode, fMode);
100
101        SkMatrix m;
102        if (fDoRotate) {
103//            m.setRotate(SkIntToScalar(30), 0, 0);
104            m.setSkew(SK_Scalar1, 0, 0, 0);
105//            m.postScale(2*SK_Scalar1/3, 2*SK_Scalar1/3);
106        } else {
107            SkScalar scale = 11*SK_Scalar1/12;
108            m.setScale(scale, scale);
109        }
110        s->setLocalMatrix(m);
111
112        paint.setShader(s)->unref();
113        paint.setFilterBitmap(fDoFilter);
114
115        canvas->translate(SkIntToScalar(50), SkIntToScalar(50));
116
117//        SkRect r = SkRect::MakeXYWH(-50, -50, 32, 16);
118//        canvas->drawRect(r, paint); return;
119        canvas->drawPaint(paint);
120    }
121
122private:
123    typedef GM INHERITED;
124};
125
126///////////////////////////////////////////////////////////////////////////////
127
128static skiagm::GM* G000(void*) { return new GiantBitmapGM(SkShader::kClamp_TileMode, false, false); }
129static skiagm::GM* G100(void*) { return new GiantBitmapGM(SkShader::kRepeat_TileMode, false, false); }
130static skiagm::GM* G200(void*) { return new GiantBitmapGM(SkShader::kMirror_TileMode, false, false); }
131static skiagm::GM* G010(void*) { return new GiantBitmapGM(SkShader::kClamp_TileMode, true, false); }
132static skiagm::GM* G110(void*) { return new GiantBitmapGM(SkShader::kRepeat_TileMode, true, false); }
133static skiagm::GM* G210(void*) { return new GiantBitmapGM(SkShader::kMirror_TileMode, true, false); }
134
135static skiagm::GM* G001(void*) { return new GiantBitmapGM(SkShader::kClamp_TileMode, false, true); }
136static skiagm::GM* G101(void*) { return new GiantBitmapGM(SkShader::kRepeat_TileMode, false, true); }
137static skiagm::GM* G201(void*) { return new GiantBitmapGM(SkShader::kMirror_TileMode, false, true); }
138static skiagm::GM* G011(void*) { return new GiantBitmapGM(SkShader::kClamp_TileMode, true, true); }
139static skiagm::GM* G111(void*) { return new GiantBitmapGM(SkShader::kRepeat_TileMode, true, true); }
140static skiagm::GM* G211(void*) { return new GiantBitmapGM(SkShader::kMirror_TileMode, true, true); }
141
142static skiagm::GMRegistry reg000(G000);
143static skiagm::GMRegistry reg100(G100);
144static skiagm::GMRegistry reg200(G200);
145static skiagm::GMRegistry reg010(G010);
146static skiagm::GMRegistry reg110(G110);
147static skiagm::GMRegistry reg210(G210);
148
149static skiagm::GMRegistry reg001(G001);
150static skiagm::GMRegistry reg101(G101);
151static skiagm::GMRegistry reg201(G201);
152static skiagm::GMRegistry reg011(G011);
153static skiagm::GMRegistry reg111(G111);
154static skiagm::GMRegistry reg211(G211);
155
156