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#include "SkCanvas.h"
10#include "SkGradientShader.h"
11#include "SkGraphics.h"
12#include "SkPath.h"
13#include "SkRegion.h"
14#include "SkShader.h"
15
16static void make_bitmap(SkBitmap* bitmap) {
17    bitmap->allocN32Pixels(64, 64);
18
19    SkCanvas canvas(*bitmap);
20
21    canvas.drawColor(SK_ColorRED);
22    SkPaint paint;
23    paint.setAntiAlias(true);
24    const SkPoint pts[] = { { 0, 0 }, { 64, 64 } };
25    const SkColor colors[] = { SK_ColorWHITE, SK_ColorBLUE };
26    paint.setShader(SkGradientShader::CreateLinear(pts, colors, nullptr, 2,
27                                                   SkShader::kClamp_TileMode))->unref();
28    canvas.drawCircle(32, 32, 32, paint);
29}
30
31class DrawBitmapRect2 : public skiagm::GM {
32    bool fUseIRect;
33public:
34    DrawBitmapRect2(bool useIRect) : fUseIRect(useIRect) {
35    }
36
37protected:
38    SkString onShortName() override {
39        SkString str;
40        str.printf("bitmaprect_%s", fUseIRect ? "i" : "s");
41        return str;
42    }
43
44    SkISize onISize() override {
45        return SkISize::Make(640, 480);
46    }
47
48    void onDraw(SkCanvas* canvas) override {
49        canvas->drawColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
50
51        const SkIRect src[] = {
52            { 0, 0, 32, 32 },
53            { 0, 0, 80, 80 },
54            { 32, 32, 96, 96 },
55            { -32, -32, 32, 32, }
56        };
57
58        SkPaint paint;
59        paint.setStyle(SkPaint::kStroke_Style);
60
61        SkBitmap bitmap;
62        make_bitmap(&bitmap);
63
64        SkRect dstR = { 0, 200, 128, 380 };
65
66        canvas->translate(16, 40);
67        for (size_t i = 0; i < SK_ARRAY_COUNT(src); i++) {
68            SkRect srcR;
69            srcR.set(src[i]);
70
71            canvas->drawBitmap(bitmap, 0, 0, &paint);
72            if (!fUseIRect) {
73                canvas->drawBitmapRect(bitmap, srcR, dstR, &paint,
74                                       SkCanvas::kStrict_SrcRectConstraint);
75            } else {
76                canvas->drawBitmapRect(bitmap, src[i], dstR, &paint);
77            }
78
79            canvas->drawRect(dstR, paint);
80            canvas->drawRect(srcR, paint);
81
82            canvas->translate(160, 0);
83        }
84    }
85
86private:
87    typedef skiagm::GM INHERITED;
88};
89
90//////////////////////////////////////////////////////////////////////////////
91
92static void make_3x3_bitmap(SkBitmap* bitmap) {
93    const int xSize = 3;
94    const int ySize = 3;
95
96    const SkColor textureData[xSize][ySize] = {
97        { SK_ColorRED,    SK_ColorWHITE, SK_ColorBLUE },
98        { SK_ColorGREEN,  SK_ColorBLACK, SK_ColorCYAN },
99        { SK_ColorYELLOW, SK_ColorGRAY,  SK_ColorMAGENTA }
100    };
101
102    bitmap->allocN32Pixels(xSize, ySize, true);
103    SkCanvas canvas(*bitmap);
104    SkPaint paint;
105
106    for (int y = 0; y < ySize; y++) {
107        for (int x = 0; x < xSize; x++) {
108            paint.setColor(textureData[x][y]);
109            canvas.drawIRect(SkIRect::MakeXYWH(x, y, 1, 1), paint);
110        }
111    }
112}
113
114// This GM attempts to make visible any issues drawBitmapRect may have
115// with partial source rects. In this case the eight pixels on the border
116// should be half the width/height of the central pixel, i.e.:
117//                         __|____|__
118//                           |    |
119//                         __|____|__
120//                           |    |
121class DrawBitmapRect3 : public skiagm::GM {
122public:
123    DrawBitmapRect3() {
124        this->setBGColor(SK_ColorBLACK);
125    }
126
127protected:
128    SkString onShortName() override {
129        SkString str;
130        str.printf("3x3bitmaprect");
131        return str;
132    }
133
134    SkISize onISize() override {
135        return SkISize::Make(640, 480);
136    }
137
138    void onDraw(SkCanvas* canvas) override {
139
140        SkBitmap bitmap;
141        make_3x3_bitmap(&bitmap);
142
143        SkRect srcR = { 0.5f, 0.5f, 2.5f, 2.5f };
144        SkRect dstR = { 100, 100, 300, 200 };
145
146        canvas->drawBitmapRect(bitmap, srcR, dstR, nullptr, SkCanvas::kStrict_SrcRectConstraint);
147    }
148
149private:
150    typedef skiagm::GM INHERITED;
151};
152
153//////////////////////////////////////////////////////////////////////////////
154static void make_big_bitmap(SkBitmap* bitmap) {
155
156    static const int gXSize = 4096;
157    static const int gYSize = 4096;
158    static const int gBorderWidth = 10;
159
160    bitmap->allocN32Pixels(gXSize, gYSize);
161    for (int y = 0; y < gYSize; ++y) {
162        for (int x = 0; x < gXSize; ++x) {
163            if (x <= gBorderWidth || x >= gXSize-gBorderWidth ||
164                y <= gBorderWidth || y >= gYSize-gBorderWidth) {
165                *bitmap->getAddr32(x, y) = SkPreMultiplyColor(0x88FFFFFF);
166            } else {
167                *bitmap->getAddr32(x, y) = SkPreMultiplyColor(0x88FF0000);
168            }
169        }
170    }
171}
172
173// This GM attempts to reveal any issues we may have when the GPU has to
174// break up a large texture in order to draw it. The XOR transfer mode will
175// create stripes in the image if there is imprecision in the destination
176// tile placement.
177class DrawBitmapRect4 : public skiagm::GM {
178    bool fUseIRect;
179    SkBitmap fBigBitmap;
180
181public:
182    DrawBitmapRect4(bool useIRect) : fUseIRect(useIRect) {
183        this->setBGColor(0x88444444);
184    }
185
186protected:
187    SkString onShortName() override {
188        SkString str;
189        str.printf("bigbitmaprect_%s", fUseIRect ? "i" : "s");
190        return str;
191    }
192
193    SkISize onISize() override {
194        return SkISize::Make(640, 480);
195    }
196
197    void onOnceBeforeDraw() override {
198        make_big_bitmap(&fBigBitmap);
199    }
200
201    void onDraw(SkCanvas* canvas) override {
202
203        SkXfermode* mode = SkXfermode::Create(SkXfermode::kXor_Mode);
204
205        SkPaint paint;
206        paint.setAlpha(128);
207        paint.setXfermode(mode)->unref();
208
209        SkRect srcR1 = { 0.0f, 0.0f, 4096.0f, 2040.0f };
210        SkRect dstR1 = { 10.1f, 10.1f, 629.9f, 400.9f };
211
212        SkRect srcR2 = { 4085.0f, 10.0f, 4087.0f, 12.0f };
213        SkRect dstR2 = { 10, 410, 30, 430 };
214
215        if (!fUseIRect) {
216            canvas->drawBitmapRect(fBigBitmap, srcR1, dstR1, &paint,
217                                   SkCanvas::kStrict_SrcRectConstraint);
218            canvas->drawBitmapRect(fBigBitmap, srcR2, dstR2, &paint,
219                                   SkCanvas::kStrict_SrcRectConstraint);
220        } else {
221            canvas->drawBitmapRect(fBigBitmap, srcR1.roundOut(), dstR1, &paint);
222            canvas->drawBitmapRect(fBigBitmap, srcR2.roundOut(), dstR2, &paint);
223        }
224    }
225
226private:
227    typedef skiagm::GM INHERITED;
228};
229
230class BitmapRectRounding : public skiagm::GM {
231    SkBitmap fBM;
232
233public:
234    BitmapRectRounding() {}
235
236protected:
237    SkString onShortName() override {
238        SkString str;
239        str.printf("bitmaprect_rounding");
240        return str;
241    }
242
243    SkISize onISize() override {
244        return SkISize::Make(640, 480);
245    }
246
247    void onOnceBeforeDraw() override {
248        fBM.allocN32Pixels(10, 10);
249        fBM.eraseColor(SK_ColorBLUE);
250    }
251
252    // This choice of coordinates and matrix land the bottom edge of the clip (and bitmap dst)
253    // at exactly 1/2 pixel boundary. However, drawBitmapRect may lose precision along the way.
254    // If it does, we may see a red-line at the bottom, instead of the bitmap exactly matching
255    // the clip (in which case we should see all blue).
256    // The correct image should be all blue.
257    void onDraw(SkCanvas* canvas) override {
258        SkPaint paint;
259        paint.setColor(SK_ColorRED);
260
261        const SkRect r = SkRect::MakeXYWH(1, 1, 110, 114);
262        canvas->scale(0.9f, 0.9f);
263
264        // the drawRect shows the same problem as clipRect(r) followed by drawcolor(red)
265        canvas->drawRect(r, paint);
266        canvas->drawBitmapRect(fBM, r, nullptr);
267    }
268
269private:
270    typedef skiagm::GM INHERITED;
271};
272DEF_GM( return new BitmapRectRounding; )
273
274//////////////////////////////////////////////////////////////////////////////
275
276DEF_GM( return new DrawBitmapRect2(false); )
277DEF_GM( return new DrawBitmapRect2(true); )
278DEF_GM( return new DrawBitmapRect3(); )
279
280#ifndef SK_BUILD_FOR_ANDROID
281DEF_GM( return new DrawBitmapRect4(false); )
282DEF_GM( return new DrawBitmapRect4(true); )
283#endif
284
285