SampleTiling.cpp revision a8c183125f2861067daf432cada06d431a795cd0 
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 "SkPaint.h"
12#include "SkPath.h"
13#include "SkRegion.h"
14#include "SkShader.h"
15#include "SkUtils.h"
16#include "SkColorPriv.h"
17#include "SkColorFilter.h"
18#include "SkPicture.h"
19#include "SkTypeface.h"
20
21// effects
22#include "SkGradientShader.h"
23#include "SkUnitMappers.h"
24#include "SkBlurMask.h"
25#include "SkBlurDrawLooper.h"
26
27static void makebm(SkBitmap* bm, SkColorType ct, int w, int h) {
28    bm->allocPixels(SkImageInfo::Make(w, h, ct, kPremul_SkAlphaType));
29    bm->eraseColor(SK_ColorTRANSPARENT);
30
31    SkCanvas    canvas(*bm);
32    SkPoint     pts[] = { { 0, 0 }, { SkIntToScalar(w), SkIntToScalar(h) } };
33    SkColor     colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
34    SkScalar    pos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
35    SkPaint     paint;
36
37    SkUnitMapper*   um = NULL;
38
39    um = new SkCosineMapper;
40//    um = new SkDiscreteMapper(12);
41
42    SkAutoUnref au(um);
43
44    paint.setDither(true);
45    paint.setShader(SkGradientShader::CreateLinear(pts, colors, pos,
46                SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode, um))->unref();
47    canvas.drawPaint(paint);
48}
49
50static void setup(SkPaint* paint, const SkBitmap& bm, bool filter,
51                  SkShader::TileMode tmx, SkShader::TileMode tmy) {
52    SkShader* shader = SkShader::CreateBitmapShader(bm, tmx, tmy);
53    paint->setShader(shader)->unref();
54    paint->setFilterLevel(filter ? SkPaint::kLow_FilterLevel : SkPaint::kNone_FilterLevel);
55}
56
57static const SkColorType gColorTypes[] = {
58    kPMColor_SkColorType,
59    kRGB_565_SkColorType,
60};
61static const int gWidth = 32;
62static const int gHeight = 32;
63
64class TilingView : public SampleView {
65    SkPicture*          fTextPicture;
66    SkBlurDrawLooper    fLooper;
67public:
68    TilingView()
69            : fLooper(0x88000000,
70                      SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(1)),
71                      SkIntToScalar(2), SkIntToScalar(2)) {
72        fTextPicture = new SkPicture();
73        for (size_t i = 0; i < SK_ARRAY_COUNT(gColorTypes); i++) {
74            makebm(&fTexture[i], gColorTypes[i], gWidth, gHeight);
75        }
76    }
77
78    ~TilingView() {
79        fTextPicture->unref();
80    }
81
82    SkBitmap    fTexture[SK_ARRAY_COUNT(gColorTypes)];
83
84protected:
85    // overrides from SkEventSink
86    virtual bool onQuery(SkEvent* evt) {
87        if (SampleCode::TitleQ(*evt)) {
88            SampleCode::TitleR(evt, "Tiling");
89            return true;
90        }
91        return this->INHERITED::onQuery(evt);
92    }
93
94    virtual void onDrawContent(SkCanvas* canvas) {
95        SkRect r = { 0, 0, SkIntToScalar(gWidth*2), SkIntToScalar(gHeight*2) };
96
97        static const char* gConfigNames[] = { "8888", "565", "4444" };
98
99        static const bool           gFilters[] = { false, true };
100        static const char*          gFilterNames[] = {     "point",                     "bilinear" };
101
102        static const SkShader::TileMode gModes[] = { SkShader::kClamp_TileMode, SkShader::kRepeat_TileMode, SkShader::kMirror_TileMode };
103        static const char*          gModeNames[] = {    "C",                    "R",                   "M" };
104
105        SkScalar y = SkIntToScalar(24);
106        SkScalar x = SkIntToScalar(10);
107
108        SkCanvas* textCanvas = NULL;
109        if (fTextPicture->width() == 0) {
110            textCanvas = fTextPicture->beginRecording(1000, 1000);
111        }
112
113        if (textCanvas) {
114            for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
115                for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++) {
116                    SkPaint p;
117                    SkString str;
118                    p.setAntiAlias(true);
119                    p.setDither(true);
120                    p.setLooper(&fLooper);
121                    str.printf("[%s,%s]", gModeNames[kx], gModeNames[ky]);
122
123                    p.setTextAlign(SkPaint::kCenter_Align);
124                    textCanvas->drawText(str.c_str(), str.size(), x + r.width()/2, y, p);
125
126                    x += r.width() * 4 / 3;
127                }
128            }
129        }
130
131        y += SkIntToScalar(16);
132
133        for (size_t i = 0; i < SK_ARRAY_COUNT(gColorTypes); i++) {
134            for (size_t j = 0; j < SK_ARRAY_COUNT(gFilters); j++) {
135                x = SkIntToScalar(10);
136                for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
137                    for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++) {
138                        SkPaint paint;
139                        setup(&paint, fTexture[i], gFilters[j], gModes[kx], gModes[ky]);
140                        paint.setDither(true);
141
142                        canvas->save();
143                        canvas->translate(x, y);
144                        canvas->drawRect(r, paint);
145                        canvas->restore();
146
147                        x += r.width() * 4 / 3;
148                    }
149                }
150                if (textCanvas) {
151                    SkPaint p;
152                    SkString str;
153                    p.setAntiAlias(true);
154                    p.setLooper(&fLooper);
155                    str.printf("%s, %s", gConfigNames[i], gFilterNames[j]);
156                    textCanvas->drawText(str.c_str(), str.size(), x, y + r.height() * 2 / 3, p);
157                }
158
159                y += r.height() * 4 / 3;
160            }
161        }
162
163        canvas->drawPicture(*fTextPicture);
164    }
165
166private:
167    typedef SampleView INHERITED;
168};
169
170//////////////////////////////////////////////////////////////////////////////
171
172static SkView* MyFactory() { return new TilingView; }
173static SkViewRegister reg(MyFactory);
174