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#include "sk_tool_utils.h"
24
25static void make_bm(SkBitmap* bm) {
26    const SkPMColor colors[] = {
27        SkPreMultiplyColor(SK_ColorRED), SkPreMultiplyColor(SK_ColorGREEN),
28        SkPreMultiplyColor(SK_ColorBLUE), SkPreMultiplyColor(SK_ColorWHITE)
29    };
30    SkColorTable* ctable = new SkColorTable(colors, 4);
31    bm->allocPixels(SkImageInfo::Make(2, 2, kIndex_8_SkColorType,
32                                      kOpaque_SkAlphaType),
33                    NULL, ctable);
34    ctable->unref();
35
36    *bm->getAddr8(0, 0) = 0;
37    *bm->getAddr8(1, 0) = 1;
38    *bm->getAddr8(0, 1) = 2;
39    *bm->getAddr8(1, 1) = 3;
40}
41
42static SkScalar draw_bm(SkCanvas* canvas, const SkBitmap& bm,
43                        SkScalar x, SkScalar y, SkPaint* paint) {
44    canvas->drawBitmap(bm, x, y, paint);
45    return SkIntToScalar(bm.width()) * 5/4;
46}
47
48static SkScalar draw_set(SkCanvas* c, const SkBitmap& bm, SkScalar x, SkPaint* p) {
49    x += draw_bm(c, bm, x, 0, p);
50    p->setFilterLevel(SkPaint::kLow_FilterLevel);
51    x += draw_bm(c, bm, x, 0, p);
52    p->setDither(true);
53    return x + draw_bm(c, bm, x, 0, p);
54}
55
56static SkScalar draw_row(SkCanvas* canvas, const SkBitmap& bm) {
57    SkAutoCanvasRestore acr(canvas, true);
58
59    SkPaint paint;
60    SkScalar x = 0;
61    const int scale = 32;
62
63    paint.setAntiAlias(true);
64    const char* name = sk_tool_utils::colortype_name(bm.colorType());
65    canvas->drawText(name, strlen(name), x, SkIntToScalar(bm.height())*scale*5/8,
66                     paint);
67    canvas->translate(SkIntToScalar(48), 0);
68
69    canvas->scale(SkIntToScalar(scale), SkIntToScalar(scale));
70
71    x += draw_set(canvas, bm, 0, &paint);
72    paint.reset();
73    paint.setAlpha(0x80);
74    draw_set(canvas, bm, x, &paint);
75    return x * scale / 3;
76}
77
78class FilterView : public SampleView {
79public:
80    SkBitmap    fBM8, fBM4444, fBM16, fBM32;
81
82    FilterView() {
83        make_bm(&fBM8);
84        fBM8.copyTo(&fBM4444, kARGB_4444_SkColorType);
85        fBM8.copyTo(&fBM16, kRGB_565_SkColorType);
86        fBM8.copyTo(&fBM32, kN32_SkColorType);
87
88        this->setBGColor(0xFFDDDDDD);
89    }
90
91protected:
92    // overrides from SkEventSink
93    virtual bool onQuery(SkEvent* evt) {
94        if (SampleCode::TitleQ(*evt)) {
95            SampleCode::TitleR(evt, "Filter");
96            return true;
97        }
98        return this->INHERITED::onQuery(evt);
99    }
100
101    virtual void onDrawContent(SkCanvas* canvas) {
102        SkScalar x = SkIntToScalar(10);
103        SkScalar y = SkIntToScalar(10);
104
105        canvas->translate(x, y);
106        y = draw_row(canvas, fBM8);
107        canvas->translate(0, y);
108        y = draw_row(canvas, fBM4444);
109        canvas->translate(0, y);
110        y = draw_row(canvas, fBM16);
111        canvas->translate(0, y);
112        draw_row(canvas, fBM32);
113    }
114
115private:
116    typedef SampleView INHERITED;
117};
118
119//////////////////////////////////////////////////////////////////////////////
120
121static SkView* MyFactory() { return new FilterView; }
122static SkViewRegister reg(MyFactory);
123