SampleFilter.cpp revision d923288e50b5a69afb0bdd5c161191b24cab8345 
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 SkPMColor colors[] = {
26        SkPreMultiplyColor(SK_ColorRED), SkPreMultiplyColor(SK_ColorGREEN),
27        SkPreMultiplyColor(SK_ColorBLUE), SkPreMultiplyColor(SK_ColorWHITE)
28    };
29    SkColorTable* ctable = new SkColorTable(colors, 4);
30    bm->allocPixels(SkImageInfo::Make(2, 2, kIndex_8_SkColorType,
31                                      kOpaque_SkAlphaType),
32                    NULL, ctable);
33    ctable->unref();
34
35    *bm->getAddr8(0, 0) = 0;
36    *bm->getAddr8(1, 0) = 1;
37    *bm->getAddr8(0, 1) = 2;
38    *bm->getAddr8(1, 1) = 3;
39}
40
41static SkScalar draw_bm(SkCanvas* canvas, const SkBitmap& bm,
42                        SkScalar x, SkScalar y, SkPaint* paint) {
43    canvas->drawBitmap(bm, x, y, paint);
44    return SkIntToScalar(bm.width()) * 5/4;
45}
46
47static SkScalar draw_set(SkCanvas* c, const SkBitmap& bm, SkScalar x, SkPaint* p) {
48    x += draw_bm(c, bm, x, 0, p);
49    p->setFilterLevel(SkPaint::kLow_FilterLevel);
50    x += draw_bm(c, bm, x, 0, p);
51    p->setDither(true);
52    return x + draw_bm(c, bm, x, 0, p);
53}
54
55static const char* gConfigNames[] = {
56    "unknown config",
57    "A8",
58    "Index8",
59    "565",
60    "4444",
61    "8888"
62};
63
64static SkScalar draw_row(SkCanvas* canvas, const SkBitmap& bm) {
65    SkAutoCanvasRestore acr(canvas, true);
66
67    SkPaint paint;
68    SkScalar x = 0;
69    const int scale = 32;
70
71    paint.setAntiAlias(true);
72    const char* name = gConfigNames[bm.config()];
73    canvas->drawText(name, strlen(name), x, SkIntToScalar(bm.height())*scale*5/8,
74                     paint);
75    canvas->translate(SkIntToScalar(48), 0);
76
77    canvas->scale(SkIntToScalar(scale), SkIntToScalar(scale));
78
79    x += draw_set(canvas, bm, 0, &paint);
80    paint.reset();
81    paint.setAlpha(0x80);
82    draw_set(canvas, bm, x, &paint);
83    return x * scale / 3;
84}
85
86class FilterView : public SampleView {
87public:
88    SkBitmap    fBM8, fBM4444, fBM16, fBM32;
89
90    FilterView() {
91        make_bm(&fBM8);
92        fBM8.copyTo(&fBM4444, kARGB_4444_SkColorType);
93        fBM8.copyTo(&fBM16, kRGB_565_SkColorType);
94        fBM8.copyTo(&fBM32, kN32_SkColorType);
95
96        this->setBGColor(0xFFDDDDDD);
97    }
98
99protected:
100    // overrides from SkEventSink
101    virtual bool onQuery(SkEvent* evt) {
102        if (SampleCode::TitleQ(*evt)) {
103            SampleCode::TitleR(evt, "Filter");
104            return true;
105        }
106        return this->INHERITED::onQuery(evt);
107    }
108
109    virtual void onDrawContent(SkCanvas* canvas) {
110        SkScalar x = SkIntToScalar(10);
111        SkScalar y = SkIntToScalar(10);
112
113        canvas->translate(x, y);
114        y = draw_row(canvas, fBM8);
115        canvas->translate(0, y);
116        y = draw_row(canvas, fBM4444);
117        canvas->translate(0, y);
118        y = draw_row(canvas, fBM16);
119        canvas->translate(0, y);
120        draw_row(canvas, fBM32);
121    }
122
123private:
124    typedef SampleView INHERITED;
125};
126
127//////////////////////////////////////////////////////////////////////////////
128
129static SkView* MyFactory() { return new FilterView; }
130static SkViewRegister reg(MyFactory);
131