1 /*
2 * Copyright 2011 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/gm.h"
9 #include "include/core/SkBitmap.h"
10 #include "include/core/SkBlendMode.h"
11 #include "include/core/SkCanvas.h"
12 #include "include/core/SkColor.h"
13 #include "include/core/SkPaint.h"
14 #include "include/core/SkPoint.h"
15 #include "include/core/SkRect.h"
16 #include "include/core/SkShader.h"
17 #include "include/core/SkSize.h"
18 #include "include/core/SkString.h"
19 #include "include/core/SkTileMode.h"
20 #include "include/core/SkTypes.h"
21 #include "include/effects/SkGradientShader.h"
22
make_bitmap(SkBitmap * bitmap)23 static void make_bitmap(SkBitmap* bitmap) {
24 bitmap->allocN32Pixels(64, 64);
25
26 SkCanvas canvas(*bitmap);
27
28 canvas.drawColor(SK_ColorRED);
29 SkPaint paint;
30 paint.setAntiAlias(true);
31 const SkPoint pts[] = { { 0, 0 }, { 64, 64 } };
32 const SkColor colors[] = { SK_ColorWHITE, SK_ColorBLUE };
33 paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp));
34 canvas.drawCircle(32, 32, 32, paint);
35 }
36
37 class DrawBitmapRect2 : public skiagm::GM {
38 bool fUseIRect;
39 public:
DrawBitmapRect2(bool useIRect)40 DrawBitmapRect2(bool useIRect) : fUseIRect(useIRect) {
41 }
42
43 protected:
onShortName()44 SkString onShortName() override {
45 SkString str;
46 str.printf("bitmaprect_%s", fUseIRect ? "i" : "s");
47 return str;
48 }
49
onISize()50 SkISize onISize() override {
51 return SkISize::Make(640, 480);
52 }
53
onDraw(SkCanvas * canvas)54 void onDraw(SkCanvas* canvas) override {
55 canvas->drawColor(0xFFCCCCCC);
56
57 const SkIRect src[] = {
58 { 0, 0, 32, 32 },
59 { 0, 0, 80, 80 },
60 { 32, 32, 96, 96 },
61 { -32, -32, 32, 32, }
62 };
63
64 SkPaint paint;
65 paint.setStyle(SkPaint::kStroke_Style);
66
67 SkBitmap bitmap;
68 make_bitmap(&bitmap);
69
70 SkRect dstR = { 0, 200, 128, 380 };
71
72 canvas->translate(16, 40);
73 for (size_t i = 0; i < SK_ARRAY_COUNT(src); i++) {
74 SkRect srcR;
75 srcR.set(src[i]);
76
77 canvas->drawBitmap(bitmap, 0, 0, &paint);
78 if (!fUseIRect) {
79 canvas->drawBitmapRect(bitmap, srcR, dstR, &paint,
80 SkCanvas::kStrict_SrcRectConstraint);
81 } else {
82 canvas->drawBitmapRect(bitmap, src[i], dstR, &paint);
83 }
84
85 canvas->drawRect(dstR, paint);
86 canvas->drawRect(srcR, paint);
87
88 canvas->translate(160, 0);
89 }
90 }
91
92 private:
93 typedef skiagm::GM INHERITED;
94 };
95
96 //////////////////////////////////////////////////////////////////////////////
97
make_3x3_bitmap(SkBitmap * bitmap)98 static void make_3x3_bitmap(SkBitmap* bitmap) {
99 const int xSize = 3;
100 const int ySize = 3;
101
102 const SkColor textureData[xSize][ySize] = {
103 { SK_ColorRED, SK_ColorWHITE, SK_ColorBLUE },
104 { SK_ColorGREEN, SK_ColorBLACK, SK_ColorCYAN },
105 { SK_ColorYELLOW, SK_ColorGRAY, SK_ColorMAGENTA }
106 };
107
108 bitmap->allocN32Pixels(xSize, ySize, true);
109 SkCanvas canvas(*bitmap);
110 SkPaint paint;
111
112 for (int y = 0; y < ySize; y++) {
113 for (int x = 0; x < xSize; x++) {
114 paint.setColor(textureData[x][y]);
115 canvas.drawIRect(SkIRect::MakeXYWH(x, y, 1, 1), paint);
116 }
117 }
118 }
119
120 // This GM attempts to make visible any issues drawBitmapRect may have
121 // with partial source rects. In this case the eight pixels on the border
122 // should be half the width/height of the central pixel, i.e.:
123 // __|____|__
124 // | |
125 // __|____|__
126 // | |
127 class DrawBitmapRect3 : public skiagm::GM {
128 public:
DrawBitmapRect3()129 DrawBitmapRect3() {
130 this->setBGColor(SK_ColorBLACK);
131 }
132
133 protected:
onShortName()134 SkString onShortName() override {
135 SkString str;
136 str.printf("3x3bitmaprect");
137 return str;
138 }
139
onISize()140 SkISize onISize() override {
141 return SkISize::Make(640, 480);
142 }
143
onDraw(SkCanvas * canvas)144 void onDraw(SkCanvas* canvas) override {
145
146 SkBitmap bitmap;
147 make_3x3_bitmap(&bitmap);
148
149 SkRect srcR = { 0.5f, 0.5f, 2.5f, 2.5f };
150 SkRect dstR = { 100, 100, 300, 200 };
151
152 canvas->drawBitmapRect(bitmap, srcR, dstR, nullptr, SkCanvas::kStrict_SrcRectConstraint);
153 }
154
155 private:
156 typedef skiagm::GM INHERITED;
157 };
158
159 //////////////////////////////////////////////////////////////////////////////
make_big_bitmap(SkBitmap * bitmap)160 static void make_big_bitmap(SkBitmap* bitmap) {
161
162 constexpr int gXSize = 4096;
163 constexpr int gYSize = 4096;
164 constexpr int gBorderWidth = 10;
165
166 bitmap->allocN32Pixels(gXSize, gYSize);
167 for (int y = 0; y < gYSize; ++y) {
168 for (int x = 0; x < gXSize; ++x) {
169 if (x <= gBorderWidth || x >= gXSize-gBorderWidth ||
170 y <= gBorderWidth || y >= gYSize-gBorderWidth) {
171 *bitmap->getAddr32(x, y) = SkPreMultiplyColor(0x88FFFFFF);
172 } else {
173 *bitmap->getAddr32(x, y) = SkPreMultiplyColor(0x88FF0000);
174 }
175 }
176 }
177 }
178
179 // This GM attempts to reveal any issues we may have when the GPU has to
180 // break up a large texture in order to draw it. The XOR transfer mode will
181 // create stripes in the image if there is imprecision in the destination
182 // tile placement.
183 class DrawBitmapRect4 : public skiagm::GM {
184 bool fUseIRect;
185 SkBitmap fBigBitmap;
186
187 public:
DrawBitmapRect4(bool useIRect)188 DrawBitmapRect4(bool useIRect) : fUseIRect(useIRect) {
189 this->setBGColor(0x88444444);
190 }
191
192 protected:
onShortName()193 SkString onShortName() override {
194 SkString str;
195 str.printf("bigbitmaprect_%s", fUseIRect ? "i" : "s");
196 return str;
197 }
198
onISize()199 SkISize onISize() override {
200 return SkISize::Make(640, 480);
201 }
202
onOnceBeforeDraw()203 void onOnceBeforeDraw() override {
204 make_big_bitmap(&fBigBitmap);
205 }
206
onDraw(SkCanvas * canvas)207 void onDraw(SkCanvas* canvas) override {
208 SkPaint paint;
209 paint.setAlpha(128);
210 paint.setBlendMode(SkBlendMode::kXor);
211
212 SkRect srcR1 = { 0.0f, 0.0f, 4096.0f, 2040.0f };
213 SkRect dstR1 = { 10.1f, 10.1f, 629.9f, 400.9f };
214
215 SkRect srcR2 = { 4085.0f, 10.0f, 4087.0f, 12.0f };
216 SkRect dstR2 = { 10, 410, 30, 430 };
217
218 if (!fUseIRect) {
219 canvas->drawBitmapRect(fBigBitmap, srcR1, dstR1, &paint,
220 SkCanvas::kStrict_SrcRectConstraint);
221 canvas->drawBitmapRect(fBigBitmap, srcR2, dstR2, &paint,
222 SkCanvas::kStrict_SrcRectConstraint);
223 } else {
224 canvas->drawBitmapRect(fBigBitmap, srcR1.roundOut(), dstR1, &paint);
225 canvas->drawBitmapRect(fBigBitmap, srcR2.roundOut(), dstR2, &paint);
226 }
227 }
228
229 private:
230 typedef skiagm::GM INHERITED;
231 };
232
233 class BitmapRectRounding : public skiagm::GM {
234 SkBitmap fBM;
235
236 public:
BitmapRectRounding()237 BitmapRectRounding() {}
238
239 protected:
onShortName()240 SkString onShortName() override {
241 SkString str;
242 str.printf("bitmaprect_rounding");
243 return str;
244 }
245
onISize()246 SkISize onISize() override {
247 return SkISize::Make(640, 480);
248 }
249
onOnceBeforeDraw()250 void onOnceBeforeDraw() override {
251 fBM.allocN32Pixels(10, 10);
252 fBM.eraseColor(SK_ColorBLUE);
253 }
254
255 // This choice of coordinates and matrix land the bottom edge of the clip (and bitmap dst)
256 // at exactly 1/2 pixel boundary. However, drawBitmapRect may lose precision along the way.
257 // If it does, we may see a red-line at the bottom, instead of the bitmap exactly matching
258 // the clip (in which case we should see all blue).
259 // The correct image should be all blue.
onDraw(SkCanvas * canvas)260 void onDraw(SkCanvas* canvas) override {
261 SkPaint paint;
262 paint.setColor(SK_ColorRED);
263
264 const SkRect r = SkRect::MakeXYWH(1, 1, 110, 114);
265 canvas->scale(0.9f, 0.9f);
266
267 // the drawRect shows the same problem as clipRect(r) followed by drawcolor(red)
268 canvas->drawRect(r, paint);
269 canvas->drawBitmapRect(fBM, r, nullptr);
270 }
271
272 private:
273 typedef skiagm::GM INHERITED;
274 };
275 DEF_GM( return new BitmapRectRounding; )
276
277 //////////////////////////////////////////////////////////////////////////////
278
279 DEF_GM( return new DrawBitmapRect2(false); )
280 DEF_GM( return new DrawBitmapRect2(true); )
281 DEF_GM( return new DrawBitmapRect3(); )
282
283 #ifndef SK_BUILD_FOR_ANDROID
284 DEF_GM( return new DrawBitmapRect4(false); )
285 DEF_GM( return new DrawBitmapRect4(true); )
286 #endif
287