SampleTiling.cpp revision e2b193ca5c76f01f8e12b4a92e9bd6ccb3ed4280 
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 "SkPictureRecorder.h"
14#include "SkRegion.h"
15#include "SkShader.h"
16#include "SkUtils.h"
17#include "SkColorPriv.h"
18#include "SkColorFilter.h"
19#include "SkPicture.h"
20#include "SkTypeface.h"
21
22// effects
23#include "SkGradientShader.h"
24#include "SkUnitMappers.h"
25#include "SkBlurMask.h"
26#include "SkBlurDrawLooper.h"
27
28static void makebm(SkBitmap* bm, SkColorType ct, int w, int h) {
29    bm->allocPixels(SkImageInfo::Make(w, h, ct, kPremul_SkAlphaType));
30    bm->eraseColor(SK_ColorTRANSPARENT);
31
32    SkCanvas    canvas(*bm);
33    SkPoint     pts[] = { { 0, 0 }, { SkIntToScalar(w), SkIntToScalar(h) } };
34    SkColor     colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
35    SkScalar    pos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
36    SkPaint     paint;
37
38    SkUnitMapper*   um = NULL;
39
40    um = new SkCosineMapper;
41//    um = new SkDiscreteMapper(12);
42
43    SkAutoUnref au(um);
44
45    paint.setDither(true);
46    paint.setShader(SkGradientShader::CreateLinear(pts, colors, pos,
47                SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode, um))->unref();
48    canvas.drawPaint(paint);
49}
50
51static void setup(SkPaint* paint, const SkBitmap& bm, bool filter,
52                  SkShader::TileMode tmx, SkShader::TileMode tmy) {
53    SkShader* shader = SkShader::CreateBitmapShader(bm, tmx, tmy);
54    paint->setShader(shader)->unref();
55    paint->setFilterLevel(filter ? SkPaint::kLow_FilterLevel : SkPaint::kNone_FilterLevel);
56}
57
58static const SkColorType gColorTypes[] = {
59    kN32_SkColorType,
60    kRGB_565_SkColorType,
61};
62static const int gWidth = 32;
63static const int gHeight = 32;
64
65class TilingView : public SampleView {
66    SkAutoTUnref<SkPicture>        fTextPicture;
67    SkAutoTUnref<SkBlurDrawLooper> fLooper;
68public:
69    TilingView()
70            : fLooper(SkBlurDrawLooper::Create(0x88000000,
71                                               SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(1)),
72                                               SkIntToScalar(2), SkIntToScalar(2))) {
73        for (size_t i = 0; i < SK_ARRAY_COUNT(gColorTypes); i++) {
74            makebm(&fTexture[i], gColorTypes[i], gWidth, gHeight);
75        }
76    }
77
78    virtual ~TilingView() {
79    }
80
81    SkBitmap    fTexture[SK_ARRAY_COUNT(gColorTypes)];
82
83protected:
84    // overrides from SkEventSink
85    virtual bool onQuery(SkEvent* evt) {
86        if (SampleCode::TitleQ(*evt)) {
87            SampleCode::TitleR(evt, "Tiling");
88            return true;
89        }
90        return this->INHERITED::onQuery(evt);
91    }
92
93    virtual void onDrawContent(SkCanvas* canvas) {
94        SkRect r = { 0, 0, SkIntToScalar(gWidth*2), SkIntToScalar(gHeight*2) };
95
96        static const char* gConfigNames[] = { "8888", "565", "4444" };
97
98        static const bool           gFilters[] = { false, true };
99        static const char*          gFilterNames[] = {     "point",                     "bilinear" };
100
101        static const SkShader::TileMode gModes[] = { SkShader::kClamp_TileMode, SkShader::kRepeat_TileMode, SkShader::kMirror_TileMode };
102        static const char*          gModeNames[] = {    "C",                    "R",                   "M" };
103
104        SkScalar y = SkIntToScalar(24);
105        SkScalar x = SkIntToScalar(10);
106
107        SkPictureRecorder recorder;
108        SkCanvas* textCanvas = NULL;
109        if (NULL == fTextPicture) {
110            textCanvas = recorder.beginRecording(1000, 1000, NULL, 0);
111        }
112
113        if (NULL != 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 (NULL != 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        if (NULL != textCanvas) {
164            SkASSERT(NULL == fTextPicture);
165            fTextPicture.reset(recorder.endRecording());
166        }
167
168        SkASSERT(NULL != fTextPicture);
169        canvas->drawPicture(*fTextPicture);
170    }
171
172private:
173    typedef SampleView INHERITED;
174};
175
176//////////////////////////////////////////////////////////////////////////////
177
178static SkView* MyFactory() { return new TilingView; }
179static SkViewRegister reg(MyFactory);
180