bitmapfilters.cpp revision 26b73d31282aa13f476fa140cb82bd624b31d4bb 
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 "gm.h"
9
10namespace skiagm {
11
12static void make_bm(SkBitmap* bm) {
13    const SkColor colors[4] = {
14        SK_ColorRED, SK_ColorGREEN,
15        SK_ColorBLUE, SK_ColorWHITE
16    };
17    SkPMColor colorsPM[4];
18    for (size_t i = 0; i < SK_ARRAY_COUNT(colors); ++i) {
19        colorsPM[i] = SkPreMultiplyColor(colors[i]);
20    }
21    SkColorTable* ctable = new SkColorTable(colorsPM, 4);
22
23    bm->setConfig(SkBitmap::kIndex8_Config, 2, 2);
24    bm->allocPixels(ctable);
25    ctable->unref();
26
27    *bm->getAddr8(0, 0) = 0;
28    *bm->getAddr8(1, 0) = 1;
29    *bm->getAddr8(0, 1) = 2;
30    *bm->getAddr8(1, 1) = 3;
31}
32
33static SkScalar draw_bm(SkCanvas* canvas, const SkBitmap& bm,
34                        SkScalar x, SkScalar y, SkPaint* paint) {
35    canvas->drawBitmap(bm, x, y, paint);
36    return SkIntToScalar(bm.width()) * 5/4;
37}
38
39static SkScalar draw_set(SkCanvas* c, const SkBitmap& bm, SkScalar x,
40                         SkPaint* p) {
41    x += draw_bm(c, bm, x, 0, p);
42    p->setFilterBitmap(true);
43    x += draw_bm(c, bm, x, 0, p);
44    p->setDither(true);
45    return x + draw_bm(c, bm, x, 0, p);
46}
47
48static const char* gConfigNames[] = {
49    "unknown config",
50    "A1",
51    "A8",
52    "Index8",
53    "565",
54    "4444",
55    "8888"
56};
57
58static SkScalar draw_row(SkCanvas* canvas, const SkBitmap& bm) {
59    SkAutoCanvasRestore acr(canvas, true);
60
61    SkPaint paint;
62    SkScalar x = 0;
63    const int scale = 32;
64
65    paint.setAntiAlias(true);
66    const char* name = gConfigNames[bm.config()];
67    canvas->drawText(name, strlen(name), x, SkIntToScalar(bm.height())*scale*5/8,
68                     paint);
69    canvas->translate(SkIntToScalar(48), 0);
70
71    canvas->scale(SkIntToScalar(scale), SkIntToScalar(scale));
72
73    x += draw_set(canvas, bm, 0, &paint);
74    paint.reset();
75    paint.setAlpha(0x80);
76    draw_set(canvas, bm, x, &paint);
77    return x * scale / 3;
78}
79
80class FilterGM : public GM {
81    bool fOnce;
82    void init() {
83        if (fOnce) {
84            return;
85        }
86        fOnce = true;
87        make_bm(&fBM8);
88        fBM8.copyTo(&fBM4444, SkBitmap::kARGB_4444_Config);
89        fBM8.copyTo(&fBM16, SkBitmap::kRGB_565_Config);
90        fBM8.copyTo(&fBM32, SkBitmap::kARGB_8888_Config);
91    }
92public:
93    SkBitmap    fBM8, fBM4444, fBM16, fBM32;
94
95	FilterGM() : fOnce(false) {
96        this->setBGColor(0xFFDDDDDD);
97    }
98
99protected:
100    virtual SkString onShortName() {
101        return SkString("bitmapfilters");
102    }
103
104	virtual SkISize onISize() {
105        return make_isize(540, 330);
106    }
107
108    virtual void onDraw(SkCanvas* canvas) {
109        this->init();
110
111        SkScalar x = SkIntToScalar(10);
112        SkScalar y = SkIntToScalar(10);
113
114        canvas->translate(x, y);
115        y = draw_row(canvas, fBM8);
116        canvas->translate(0, y);
117        y = draw_row(canvas, fBM4444);
118        canvas->translate(0, y);
119        y = draw_row(canvas, fBM16);
120        canvas->translate(0, y);
121        draw_row(canvas, fBM32);
122    }
123
124private:
125    typedef GM INHERITED;
126};
127
128//////////////////////////////////////////////////////////////////////////////
129
130static GM* MyFactory(void*) { return new FilterGM; }
131static GMRegistry reg(MyFactory);
132
133}
134
135
136
137