bleed.cpp revision d6ca4ac1ee2a0096b42b02e9408181c9e0387939 
1/*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#include "gm.h"
9#include "SkBlurMask.h"
10#include "SkBlurMaskFilter.h"
11#include "SkCanvas.h"
12
13#if SK_SUPPORT_GPU
14#include "GrContext.h"
15#endif
16
17// Create a black&white checked texture with 2 1-pixel rings
18// around the outside edge. The inner ring is red and the outer ring is blue.
19static void make_ringed_bitmap(SkBitmap* result, int width, int height) {
20    SkASSERT(0 == width % 2 && 0 == height % 2);
21
22    static const SkPMColor kRed = SkPreMultiplyColor(SK_ColorRED);
23    static const SkPMColor kBlue = SkPreMultiplyColor(SK_ColorBLUE);
24    static const SkPMColor kBlack = SkPreMultiplyColor(SK_ColorBLACK);
25    static const SkPMColor kWhite = SkPreMultiplyColor(SK_ColorWHITE);
26
27    result->setConfig(SkBitmap::kARGB_8888_Config, width, height, 0,
28                      kOpaque_SkAlphaType);
29    result->allocPixels();
30    SkAutoLockPixels lock(*result);
31
32    SkPMColor* scanline = result->getAddr32(0, 0);
33    for (int x = 0; x < width; ++x) {
34        scanline[x] = kBlue;
35    }
36    scanline = result->getAddr32(0, 1);
37    scanline[0] = kBlue;
38    for (int x = 1; x < width - 1; ++x) {
39        scanline[x] = kRed;
40    }
41    scanline[width-1] = kBlue;
42
43    for (int y = 2; y < height/2; ++y) {
44        scanline = result->getAddr32(0, y);
45        scanline[0] = kBlue;
46        scanline[1] = kRed;
47        for (int x = 2; x < width/2; ++x) {
48            scanline[x] = kBlack;
49        }
50        for (int x = width/2; x < width-2; ++x) {
51            scanline[x] = kWhite;
52        }
53        scanline[width-2] = kRed;
54        scanline[width-1] = kBlue;
55    }
56
57    for (int y = height/2; y < height-2; ++y) {
58        scanline = result->getAddr32(0, y);
59        scanline[0] = kBlue;
60        scanline[1] = kRed;
61        for (int x = 2; x < width/2; ++x) {
62            scanline[x] = kWhite;
63        }
64        for (int x = width/2; x < width-2; ++x) {
65            scanline[x] = kBlack;
66        }
67        scanline[width-2] = kRed;
68        scanline[width-1] = kBlue;
69    }
70
71    scanline = result->getAddr32(0, height-2);
72    scanline[0] = kBlue;
73    for (int x = 1; x < width - 1; ++x) {
74        scanline[x] = kRed;
75    }
76    scanline[width-1] = kBlue;
77
78    scanline = result->getAddr32(0, height-1);
79    for (int x = 0; x < width; ++x) {
80        scanline[x] = kBlue;
81    }
82    result->setImmutable();
83}
84
85// This GM exercises the drawBitmapRectToRect "bleed" flag
86class BleedGM : public skiagm::GM {
87public:
88    BleedGM() {}
89
90protected:
91    virtual SkString onShortName() SK_OVERRIDE {
92        return SkString("bleed");
93    }
94
95    virtual SkISize onISize() SK_OVERRIDE {
96        return SkISize::Make(kWidth, 780);
97    }
98
99    virtual void onOnceBeforeDraw() SK_OVERRIDE {
100        make_ringed_bitmap(&fBitmapSmall, kSmallTextureSize, kSmallTextureSize);
101
102        // To exercise the GPU's tiling path we need a texture
103        // too big for the GPU to handle in one go
104        make_ringed_bitmap(&fBitmapBig, 2*kMaxTextureSize, 2*kMaxTextureSize);
105    }
106
107    // Draw only the center of the small bitmap
108    void drawCase1(SkCanvas* canvas, int transX, int transY,
109                   SkCanvas::DrawBitmapRectFlags flags, SkPaint::FilterLevel filter) {
110        SkRect src = SkRect::MakeXYWH(2, 2,
111                                      SkIntToScalar(kSmallTextureSize-4),
112                                      SkIntToScalar(kSmallTextureSize-4));
113        SkRect dst = SkRect::MakeXYWH(0, 0, SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
114
115        SkPaint paint;
116        paint.setFilterLevel(filter);
117
118        canvas->save();
119        canvas->translate(SkIntToScalar(transX), SkIntToScalar(transY));
120        canvas->drawBitmapRectToRect(fBitmapSmall, &src, dst, &paint, flags);
121        canvas->restore();
122    }
123
124    // Draw almost all of the large bitmap
125    void drawCase2(SkCanvas* canvas, int transX, int transY,
126                   SkCanvas::DrawBitmapRectFlags flags, SkPaint::FilterLevel filter) {
127        SkRect src = SkRect::MakeXYWH(2, 2,
128                                      SkIntToScalar(fBitmapBig.width()-4),
129                                      SkIntToScalar(fBitmapBig.height()-4));
130        SkRect dst = SkRect::MakeXYWH(0, 0, SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
131
132        SkPaint paint;
133        paint.setFilterLevel(filter);
134
135        canvas->save();
136        canvas->translate(SkIntToScalar(transX), SkIntToScalar(transY));
137        canvas->drawBitmapRectToRect(fBitmapBig, &src, dst, &paint, flags);
138        canvas->restore();
139    }
140
141    // Draw ~1/4 of the large bitmap
142    void drawCase3(SkCanvas* canvas, int transX, int transY,
143                   SkCanvas::DrawBitmapRectFlags flags, SkPaint::FilterLevel filter) {
144        SkRect src = SkRect::MakeXYWH(2, 2,
145                                      SkIntToScalar(fBitmapBig.width()/2-2),
146                                      SkIntToScalar(fBitmapBig.height()/2-2));
147        SkRect dst = SkRect::MakeXYWH(0, 0, SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
148
149        SkPaint paint;
150        paint.setFilterLevel(filter);
151
152        canvas->save();
153        canvas->translate(SkIntToScalar(transX), SkIntToScalar(transY));
154        canvas->drawBitmapRectToRect(fBitmapBig, &src, dst, &paint, flags);
155        canvas->restore();
156    }
157
158    // Draw the center of the small bitmap with a mask filter
159    void drawCase4(SkCanvas* canvas, int transX, int transY,
160                   SkCanvas::DrawBitmapRectFlags flags, SkPaint::FilterLevel filter) {
161        SkRect src = SkRect::MakeXYWH(2, 2,
162                                      SkIntToScalar(kSmallTextureSize-4),
163                                      SkIntToScalar(kSmallTextureSize-4));
164        SkRect dst = SkRect::MakeXYWH(0, 0, SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
165
166        SkPaint paint;
167        paint.setFilterLevel(filter);
168        SkMaskFilter* mf = SkBlurMaskFilter::Create(SkBlurMaskFilter::kNormal_BlurStyle,
169                                         SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(3)));
170        paint.setMaskFilter(mf)->unref();
171
172        canvas->save();
173        canvas->translate(SkIntToScalar(transX), SkIntToScalar(transY));
174        canvas->drawBitmapRectToRect(fBitmapSmall, &src, dst, &paint, flags);
175        canvas->restore();
176    }
177
178    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
179
180        canvas->clear(SK_ColorGRAY);
181
182        for (int m = 0; m < 2; ++m) {
183            canvas->save();
184            if (m) {
185                static const SkScalar kBottom = SkIntToScalar(kRow3Y + kBlockSize + kBlockSpacing);
186                canvas->translate(0, kBottom);
187                SkMatrix rotate;
188                rotate.setRotate(15.f, 0, kBottom + kBlockSpacing);
189                canvas->concat(rotate);
190                canvas->scale(0.71f, 1.22f);
191            }
192
193            // First draw a column with no bleeding, tiling, or filtering
194            this->drawCase1(canvas, kCol0X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kNone_FilterLevel);
195            this->drawCase2(canvas, kCol0X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kNone_FilterLevel);
196            this->drawCase3(canvas, kCol0X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kNone_FilterLevel);
197            this->drawCase4(canvas, kCol0X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kNone_FilterLevel);
198
199            // Then draw a column with no bleeding or tiling but with low filtering
200            this->drawCase1(canvas, kCol1X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
201            this->drawCase2(canvas, kCol1X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
202            this->drawCase3(canvas, kCol1X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
203            this->drawCase4(canvas, kCol1X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
204
205            // Then draw a column with no bleeding or tiling but with high filtering
206            this->drawCase1(canvas, kCol2X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
207            this->drawCase2(canvas, kCol2X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
208            this->drawCase3(canvas, kCol2X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
209            this->drawCase4(canvas, kCol2X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
210
211#if SK_SUPPORT_GPU
212            GrContext* ctx = canvas->getGrContext();
213            int oldMaxTextureSize = 0;
214            if (NULL != ctx) {
215                // shrink the max texture size so all our textures can be reasonably sized
216                oldMaxTextureSize = ctx->getMaxTextureSize();
217                ctx->setMaxTextureSizeOverride(kMaxTextureSize);
218            }
219#endif
220
221            // Then draw a column with no bleeding but with tiling and low filtering
222            this->drawCase1(canvas, kCol3X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
223            this->drawCase2(canvas, kCol3X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
224            this->drawCase3(canvas, kCol3X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
225            this->drawCase4(canvas, kCol3X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
226
227            // Then draw a column with no bleeding but with tiling and high filtering
228            this->drawCase1(canvas, kCol4X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
229            this->drawCase2(canvas, kCol4X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
230            this->drawCase3(canvas, kCol4X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
231            this->drawCase4(canvas, kCol4X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
232
233            // Then draw a column with bleeding, tiling, and low filtering
234            this->drawCase1(canvas, kCol5X, kRow0Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
235            this->drawCase2(canvas, kCol5X, kRow1Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
236            this->drawCase3(canvas, kCol5X, kRow2Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
237            this->drawCase4(canvas, kCol5X, kRow3Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
238
239            // Finally draw a column with bleeding, tiling, and high filtering
240            this->drawCase1(canvas, kCol6X, kRow0Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
241            this->drawCase2(canvas, kCol6X, kRow1Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
242            this->drawCase3(canvas, kCol6X, kRow2Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
243            this->drawCase4(canvas, kCol6X, kRow3Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
244
245#if SK_SUPPORT_GPU
246            if (NULL != ctx) {
247                ctx->setMaxTextureSizeOverride(oldMaxTextureSize);
248            }
249#endif
250            canvas->restore();
251        }
252    }
253
254private:
255    static const int kBlockSize = 70;
256    static const int kBlockSpacing = 5;
257
258    static const int kCol0X = kBlockSpacing;
259    static const int kCol1X = 2*kBlockSpacing + kBlockSize;
260    static const int kCol2X = 3*kBlockSpacing + 2*kBlockSize;
261    static const int kCol3X = 4*kBlockSpacing + 3*kBlockSize;
262    static const int kCol4X = 5*kBlockSpacing + 4*kBlockSize;
263    static const int kCol5X = 6*kBlockSpacing + 5*kBlockSize;
264    static const int kCol6X = 7*kBlockSpacing + 6*kBlockSize;
265    static const int kWidth = 8*kBlockSpacing + 7*kBlockSize;
266
267    static const int kRow0Y = kBlockSpacing;
268    static const int kRow1Y = 2*kBlockSpacing + kBlockSize;
269    static const int kRow2Y = 3*kBlockSpacing + 2*kBlockSize;
270    static const int kRow3Y = 4*kBlockSpacing + 3*kBlockSize;
271
272    static const int kSmallTextureSize = 6;
273    static const int kMaxTextureSize = 32;
274
275    SkBitmap fBitmapSmall;
276    SkBitmap fBitmapBig;
277
278    typedef GM INHERITED;
279};
280
281DEF_GM( return new BleedGM(); )
282