SampleFilter.cpp revision 6fcbfcead5dc1b61fa5b4c139a1a3714e8c58091 
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 "SampleCode.h"
9#include "SkView.h"
10#include "SkCanvas.h"
11#include "SkGradientShader.h"
12#include "SkPath.h"
13#include "SkRegion.h"
14#include "SkShader.h"
15#include "SkUtils.h"
16#include "Sk1DPathEffect.h"
17#include "SkCornerPathEffect.h"
18#include "SkPathMeasure.h"
19#include "SkRandom.h"
20#include "SkColorPriv.h"
21#include "SkColorFilter.h"
22#include "SkDither.h"
23
24static void make_bm(SkBitmap* bm) {
25    const SkColor colors[] = {
26        SK_ColorRED, SK_ColorGREEN,
27        SK_ColorBLUE, SK_ColorWHITE
28    };
29    SkColorTable* ctable = new SkColorTable(colors, 4);
30    bm->setConfig(SkBitmap::kIndex8_Config, 2, 2);
31    bm->allocPixels(ctable);
32    ctable->unref();
33
34    *bm->getAddr8(0, 0) = 0;
35    *bm->getAddr8(1, 0) = 1;
36    *bm->getAddr8(0, 1) = 2;
37    *bm->getAddr8(1, 1) = 3;
38}
39
40static SkScalar draw_bm(SkCanvas* canvas, const SkBitmap& bm,
41                        SkScalar x, SkScalar y, SkPaint* paint) {
42#if 1
43    canvas->drawBitmap(bm, x, y, paint);
44    return SkIntToScalar(bm.width()) * 5/4;
45#else
46    SkAutoCanvasRestore acr(canvas, true);
47    canvas->translate(x, y);
48
49    SkScalar w = SkIntToScalar(bm.width());
50    SkScalar h = SkIntToScalar(bm.height());
51    SkShader* s = SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode,
52                                               SkShader::kRepeat_TileMode);
53    paint->setShader(s)->unref();
54    canvas->drawRect(SkRect::MakeWH(w, h), *paint);
55    paint->setShader(NULL);
56    return w * 5/4;
57#endif
58}
59
60static SkScalar draw_set(SkCanvas* c, const SkBitmap& bm, SkScalar x, SkPaint* p) {
61    x += draw_bm(c, bm, x, 0, p);
62    p->setFilterBitmap(true);
63    x += draw_bm(c, bm, x, 0, p);
64    p->setDither(true);
65    return x + draw_bm(c, bm, x, 0, p);
66}
67
68static const char* gConfigNames[] = {
69    "unknown config",
70    "A1",
71    "A8",
72    "Index8",
73    "565",
74    "4444",
75    "8888"
76};
77
78static SkScalar draw_row(SkCanvas* canvas, const SkBitmap& bm) {
79    SkAutoCanvasRestore acr(canvas, true);
80
81    SkPaint paint;
82    SkScalar x = 0;
83    const int scale = 32;
84
85    paint.setAntiAlias(true);
86    const char* name = gConfigNames[bm.config()];
87    canvas->drawText(name, strlen(name), x, SkIntToScalar(bm.height())*scale*5/8,
88                     paint);
89    canvas->translate(SkIntToScalar(48), 0);
90
91    canvas->scale(SkIntToScalar(scale), SkIntToScalar(scale));
92
93    x += draw_set(canvas, bm, 0, &paint);
94    paint.reset();
95    paint.setAlpha(0x80);
96    draw_set(canvas, bm, x, &paint);
97    return x * scale / 3;
98}
99
100class FilterView : public SampleView {
101public:
102    SkBitmap    fBM8, fBM4444, fBM16, fBM32;
103
104    FilterView() {
105        make_bm(&fBM8);
106        fBM8.copyTo(&fBM4444, SkBitmap::kARGB_4444_Config);
107        fBM8.copyTo(&fBM16, SkBitmap::kRGB_565_Config);
108        fBM8.copyTo(&fBM32, SkBitmap::kARGB_8888_Config);
109
110        this->setBGColor(0xFFDDDDDD);
111    }
112
113protected:
114    // overrides from SkEventSink
115    virtual bool onQuery(SkEvent* evt) {
116        if (SampleCode::TitleQ(*evt)) {
117            SampleCode::TitleR(evt, "Filter");
118            return true;
119        }
120        return this->INHERITED::onQuery(evt);
121    }
122
123    virtual void onDrawContent(SkCanvas* canvas) {
124        SkScalar x = SkIntToScalar(10);
125        SkScalar y = SkIntToScalar(10);
126
127        canvas->translate(x, y);
128        y = draw_row(canvas, fBM8);
129        canvas->translate(0, y);
130        y = draw_row(canvas, fBM4444);
131        canvas->translate(0, y);
132        y = draw_row(canvas, fBM16);
133        canvas->translate(0, y);
134        draw_row(canvas, fBM32);
135    }
136
137private:
138    typedef SampleView INHERITED;
139};
140
141//////////////////////////////////////////////////////////////////////////////
142
143static SkView* MyFactory() { return new FilterView; }
144static SkViewRegister reg(MyFactory);
145