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->allocN32Pixels(width, height, true);
28
29    SkPMColor* scanline = result->getAddr32(0, 0);
30    for (int x = 0; x < width; ++x) {
31        scanline[x] = kBlue;
32    }
33    scanline = result->getAddr32(0, 1);
34    scanline[0] = kBlue;
35    for (int x = 1; x < width - 1; ++x) {
36        scanline[x] = kRed;
37    }
38    scanline[width-1] = kBlue;
39
40    for (int y = 2; y < height/2; ++y) {
41        scanline = result->getAddr32(0, y);
42        scanline[0] = kBlue;
43        scanline[1] = kRed;
44        for (int x = 2; x < width/2; ++x) {
45            scanline[x] = kBlack;
46        }
47        for (int x = width/2; x < width-2; ++x) {
48            scanline[x] = kWhite;
49        }
50        scanline[width-2] = kRed;
51        scanline[width-1] = kBlue;
52    }
53
54    for (int y = height/2; y < height-2; ++y) {
55        scanline = result->getAddr32(0, y);
56        scanline[0] = kBlue;
57        scanline[1] = kRed;
58        for (int x = 2; x < width/2; ++x) {
59            scanline[x] = kWhite;
60        }
61        for (int x = width/2; x < width-2; ++x) {
62            scanline[x] = kBlack;
63        }
64        scanline[width-2] = kRed;
65        scanline[width-1] = kBlue;
66    }
67
68    scanline = result->getAddr32(0, height-2);
69    scanline[0] = kBlue;
70    for (int x = 1; x < width - 1; ++x) {
71        scanline[x] = kRed;
72    }
73    scanline[width-1] = kBlue;
74
75    scanline = result->getAddr32(0, height-1);
76    for (int x = 0; x < width; ++x) {
77        scanline[x] = kBlue;
78    }
79    result->setImmutable();
80}
81
82// This GM exercises the drawBitmapRectToRect "bleed" flag
83class BleedGM : public skiagm::GM {
84public:
85    BleedGM() {}
86
87protected:
88    virtual uint32_t onGetFlags() const SK_OVERRIDE {
89        return kSkipTiled_Flag;
90    }
91
92    virtual SkString onShortName() SK_OVERRIDE {
93        return SkString("bleed");
94    }
95
96    virtual SkISize onISize() SK_OVERRIDE {
97        return SkISize::Make(kWidth, 780);
98    }
99
100    virtual void onOnceBeforeDraw() SK_OVERRIDE {
101        make_ringed_bitmap(&fBitmapSmall, kSmallTextureSize, kSmallTextureSize);
102
103        // To exercise the GPU's tiling path we need a texture
104        // too big for the GPU to handle in one go
105        make_ringed_bitmap(&fBitmapBig, 2*kMaxTextureSize, 2*kMaxTextureSize);
106    }
107
108    // Draw only the center of the small bitmap
109    void drawCase1(SkCanvas* canvas, int transX, int transY,
110                   SkCanvas::DrawBitmapRectFlags flags, SkPaint::FilterLevel filter) {
111        SkRect src = SkRect::MakeXYWH(2, 2,
112                                      SkIntToScalar(kSmallTextureSize-4),
113                                      SkIntToScalar(kSmallTextureSize-4));
114        SkRect dst = SkRect::MakeXYWH(0, 0, SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
115
116        SkPaint paint;
117        paint.setFilterLevel(filter);
118
119        canvas->save();
120        canvas->translate(SkIntToScalar(transX), SkIntToScalar(transY));
121        canvas->drawBitmapRectToRect(fBitmapSmall, &src, dst, &paint, flags);
122        canvas->restore();
123    }
124
125    // Draw almost all of the large bitmap
126    void drawCase2(SkCanvas* canvas, int transX, int transY,
127                   SkCanvas::DrawBitmapRectFlags flags, SkPaint::FilterLevel filter) {
128        SkRect src = SkRect::MakeXYWH(2, 2,
129                                      SkIntToScalar(fBitmapBig.width()-4),
130                                      SkIntToScalar(fBitmapBig.height()-4));
131        SkRect dst = SkRect::MakeXYWH(0, 0, SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
132
133        SkPaint paint;
134        paint.setFilterLevel(filter);
135
136        canvas->save();
137        canvas->translate(SkIntToScalar(transX), SkIntToScalar(transY));
138        canvas->drawBitmapRectToRect(fBitmapBig, &src, dst, &paint, flags);
139        canvas->restore();
140    }
141
142    // Draw ~1/4 of the large bitmap
143    void drawCase3(SkCanvas* canvas, int transX, int transY,
144                   SkCanvas::DrawBitmapRectFlags flags, SkPaint::FilterLevel filter) {
145        SkRect src = SkRect::MakeXYWH(2, 2,
146                                      SkIntToScalar(fBitmapBig.width()/2-2),
147                                      SkIntToScalar(fBitmapBig.height()/2-2));
148        SkRect dst = SkRect::MakeXYWH(0, 0, SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
149
150        SkPaint paint;
151        paint.setFilterLevel(filter);
152
153        canvas->save();
154        canvas->translate(SkIntToScalar(transX), SkIntToScalar(transY));
155        canvas->drawBitmapRectToRect(fBitmapBig, &src, dst, &paint, flags);
156        canvas->restore();
157    }
158
159    // Draw the center of the small bitmap with a mask filter
160    void drawCase4(SkCanvas* canvas, int transX, int transY,
161                   SkCanvas::DrawBitmapRectFlags flags, SkPaint::FilterLevel filter) {
162        SkRect src = SkRect::MakeXYWH(2, 2,
163                                      SkIntToScalar(kSmallTextureSize-4),
164                                      SkIntToScalar(kSmallTextureSize-4));
165        SkRect dst = SkRect::MakeXYWH(0, 0, SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
166
167        SkPaint paint;
168        paint.setFilterLevel(filter);
169        SkMaskFilter* mf = SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
170                                         SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(3)));
171        paint.setMaskFilter(mf)->unref();
172
173        canvas->save();
174        canvas->translate(SkIntToScalar(transX), SkIntToScalar(transY));
175        canvas->drawBitmapRectToRect(fBitmapSmall, &src, dst, &paint, flags);
176        canvas->restore();
177    }
178
179    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
180
181        canvas->clear(SK_ColorGRAY);
182
183        for (int m = 0; m < 2; ++m) {
184            canvas->save();
185            if (m) {
186                static const SkScalar kBottom = SkIntToScalar(kRow3Y + kBlockSize + kBlockSpacing);
187                canvas->translate(0, kBottom);
188                SkMatrix rotate;
189                rotate.setRotate(15.f, 0, kBottom + kBlockSpacing);
190                canvas->concat(rotate);
191                canvas->scale(0.71f, 1.22f);
192            }
193
194            // First draw a column with no bleeding, tiling, or filtering
195            this->drawCase1(canvas, kCol0X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kNone_FilterLevel);
196            this->drawCase2(canvas, kCol0X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kNone_FilterLevel);
197            this->drawCase3(canvas, kCol0X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kNone_FilterLevel);
198            this->drawCase4(canvas, kCol0X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kNone_FilterLevel);
199
200            // Then draw a column with no bleeding or tiling but with low filtering
201            this->drawCase1(canvas, kCol1X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
202            this->drawCase2(canvas, kCol1X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
203            this->drawCase3(canvas, kCol1X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
204            this->drawCase4(canvas, kCol1X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
205
206            // Then draw a column with no bleeding or tiling but with high filtering
207            this->drawCase1(canvas, kCol2X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
208            this->drawCase2(canvas, kCol2X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
209            this->drawCase3(canvas, kCol2X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
210            this->drawCase4(canvas, kCol2X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
211
212#if SK_SUPPORT_GPU
213            GrContext* ctx = canvas->getGrContext();
214            int oldMaxTextureSize = 0;
215            if (NULL != ctx) {
216                // shrink the max texture size so all our textures can be reasonably sized
217                oldMaxTextureSize = ctx->getMaxTextureSize();
218                ctx->setMaxTextureSizeOverride(kMaxTextureSize);
219            }
220#endif
221
222            // Then draw a column with no bleeding but with tiling and low filtering
223            this->drawCase1(canvas, kCol3X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
224            this->drawCase2(canvas, kCol3X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
225            this->drawCase3(canvas, kCol3X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
226            this->drawCase4(canvas, kCol3X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
227
228            // Then draw a column with no bleeding but with tiling and high filtering
229            this->drawCase1(canvas, kCol4X, kRow0Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
230            this->drawCase2(canvas, kCol4X, kRow1Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
231            this->drawCase3(canvas, kCol4X, kRow2Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
232            this->drawCase4(canvas, kCol4X, kRow3Y, SkCanvas::kNone_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
233
234            // Then draw a column with bleeding, tiling, and low filtering
235            this->drawCase1(canvas, kCol5X, kRow0Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
236            this->drawCase2(canvas, kCol5X, kRow1Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
237            this->drawCase3(canvas, kCol5X, kRow2Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
238            this->drawCase4(canvas, kCol5X, kRow3Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kLow_FilterLevel);
239
240            // Finally draw a column with bleeding, tiling, and high filtering
241            this->drawCase1(canvas, kCol6X, kRow0Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
242            this->drawCase2(canvas, kCol6X, kRow1Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
243            this->drawCase3(canvas, kCol6X, kRow2Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
244            this->drawCase4(canvas, kCol6X, kRow3Y, SkCanvas::kBleed_DrawBitmapRectFlag, SkPaint::kHigh_FilterLevel);
245
246#if SK_SUPPORT_GPU
247            if (NULL != ctx) {
248                ctx->setMaxTextureSizeOverride(oldMaxTextureSize);
249            }
250#endif
251            canvas->restore();
252        }
253    }
254
255private:
256    static const int kBlockSize = 70;
257    static const int kBlockSpacing = 5;
258
259    static const int kCol0X = kBlockSpacing;
260    static const int kCol1X = 2*kBlockSpacing + kBlockSize;
261    static const int kCol2X = 3*kBlockSpacing + 2*kBlockSize;
262    static const int kCol3X = 4*kBlockSpacing + 3*kBlockSize;
263    static const int kCol4X = 5*kBlockSpacing + 4*kBlockSize;
264    static const int kCol5X = 6*kBlockSpacing + 5*kBlockSize;
265    static const int kCol6X = 7*kBlockSpacing + 6*kBlockSize;
266    static const int kWidth = 8*kBlockSpacing + 7*kBlockSize;
267
268    static const int kRow0Y = kBlockSpacing;
269    static const int kRow1Y = 2*kBlockSpacing + kBlockSize;
270    static const int kRow2Y = 3*kBlockSpacing + 2*kBlockSize;
271    static const int kRow3Y = 4*kBlockSpacing + 3*kBlockSize;
272
273    static const int kSmallTextureSize = 6;
274    static const int kMaxTextureSize = 32;
275
276    SkBitmap fBitmapSmall;
277    SkBitmap fBitmapBig;
278
279    typedef GM INHERITED;
280};
281
282DEF_GM( return new BleedGM(); )
283