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.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
make_bitmap(SkBitmap * bitmap)16 static 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::MakeLinear(pts, colors, nullptr, 2,
27 SkShader::kClamp_TileMode));
28 canvas.drawCircle(32, 32, 32, paint);
29 }
30
31 class DrawBitmapRect2 : public skiagm::GM {
32 bool fUseIRect;
33 public:
DrawBitmapRect2(bool useIRect)34 DrawBitmapRect2(bool useIRect) : fUseIRect(useIRect) {
35 }
36
37 protected:
onShortName()38 SkString onShortName() override {
39 SkString str;
40 str.printf("bitmaprect_%s", fUseIRect ? "i" : "s");
41 return str;
42 }
43
onISize()44 SkISize onISize() override {
45 return SkISize::Make(640, 480);
46 }
47
onDraw(SkCanvas * canvas)48 void onDraw(SkCanvas* canvas) override {
49 canvas->drawColor(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
86 private:
87 typedef skiagm::GM INHERITED;
88 };
89
90 //////////////////////////////////////////////////////////////////////////////
91
make_3x3_bitmap(SkBitmap * bitmap)92 static 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 // | |
121 class DrawBitmapRect3 : public skiagm::GM {
122 public:
DrawBitmapRect3()123 DrawBitmapRect3() {
124 this->setBGColor(SK_ColorBLACK);
125 }
126
127 protected:
onShortName()128 SkString onShortName() override {
129 SkString str;
130 str.printf("3x3bitmaprect");
131 return str;
132 }
133
onISize()134 SkISize onISize() override {
135 return SkISize::Make(640, 480);
136 }
137
onDraw(SkCanvas * canvas)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
149 private:
150 typedef skiagm::GM INHERITED;
151 };
152
153 //////////////////////////////////////////////////////////////////////////////
make_big_bitmap(SkBitmap * bitmap)154 static void make_big_bitmap(SkBitmap* bitmap) {
155
156 constexpr int gXSize = 4096;
157 constexpr int gYSize = 4096;
158 constexpr 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.
177 class DrawBitmapRect4 : public skiagm::GM {
178 bool fUseIRect;
179 SkBitmap fBigBitmap;
180
181 public:
DrawBitmapRect4(bool useIRect)182 DrawBitmapRect4(bool useIRect) : fUseIRect(useIRect) {
183 this->setBGColor(0x88444444);
184 }
185
186 protected:
onShortName()187 SkString onShortName() override {
188 SkString str;
189 str.printf("bigbitmaprect_%s", fUseIRect ? "i" : "s");
190 return str;
191 }
192
onISize()193 SkISize onISize() override {
194 return SkISize::Make(640, 480);
195 }
196
onOnceBeforeDraw()197 void onOnceBeforeDraw() override {
198 make_big_bitmap(&fBigBitmap);
199 }
200
onDraw(SkCanvas * canvas)201 void onDraw(SkCanvas* canvas) override {
202 SkPaint paint;
203 paint.setAlpha(128);
204 paint.setBlendMode(SkBlendMode::kXor);
205
206 SkRect srcR1 = { 0.0f, 0.0f, 4096.0f, 2040.0f };
207 SkRect dstR1 = { 10.1f, 10.1f, 629.9f, 400.9f };
208
209 SkRect srcR2 = { 4085.0f, 10.0f, 4087.0f, 12.0f };
210 SkRect dstR2 = { 10, 410, 30, 430 };
211
212 if (!fUseIRect) {
213 canvas->drawBitmapRect(fBigBitmap, srcR1, dstR1, &paint,
214 SkCanvas::kStrict_SrcRectConstraint);
215 canvas->drawBitmapRect(fBigBitmap, srcR2, dstR2, &paint,
216 SkCanvas::kStrict_SrcRectConstraint);
217 } else {
218 canvas->drawBitmapRect(fBigBitmap, srcR1.roundOut(), dstR1, &paint);
219 canvas->drawBitmapRect(fBigBitmap, srcR2.roundOut(), dstR2, &paint);
220 }
221 }
222
223 private:
224 typedef skiagm::GM INHERITED;
225 };
226
227 class BitmapRectRounding : public skiagm::GM {
228 SkBitmap fBM;
229
230 public:
BitmapRectRounding()231 BitmapRectRounding() {}
232
233 protected:
onShortName()234 SkString onShortName() override {
235 SkString str;
236 str.printf("bitmaprect_rounding");
237 return str;
238 }
239
onISize()240 SkISize onISize() override {
241 return SkISize::Make(640, 480);
242 }
243
onOnceBeforeDraw()244 void onOnceBeforeDraw() override {
245 fBM.allocN32Pixels(10, 10);
246 fBM.eraseColor(SK_ColorBLUE);
247 }
248
249 // This choice of coordinates and matrix land the bottom edge of the clip (and bitmap dst)
250 // at exactly 1/2 pixel boundary. However, drawBitmapRect may lose precision along the way.
251 // If it does, we may see a red-line at the bottom, instead of the bitmap exactly matching
252 // the clip (in which case we should see all blue).
253 // The correct image should be all blue.
onDraw(SkCanvas * canvas)254 void onDraw(SkCanvas* canvas) override {
255 SkPaint paint;
256 paint.setColor(SK_ColorRED);
257
258 const SkRect r = SkRect::MakeXYWH(1, 1, 110, 114);
259 canvas->scale(0.9f, 0.9f);
260
261 // the drawRect shows the same problem as clipRect(r) followed by drawcolor(red)
262 canvas->drawRect(r, paint);
263 canvas->drawBitmapRect(fBM, r, nullptr);
264 }
265
266 private:
267 typedef skiagm::GM INHERITED;
268 };
269 DEF_GM( return new BitmapRectRounding; )
270
271 //////////////////////////////////////////////////////////////////////////////
272
273 DEF_GM( return new DrawBitmapRect2(false); )
274 DEF_GM( return new DrawBitmapRect2(true); )
275 DEF_GM( return new DrawBitmapRect3(); )
276
277 #ifndef SK_BUILD_FOR_ANDROID
278 DEF_GM( return new DrawBitmapRect4(false); )
279 DEF_GM( return new DrawBitmapRect4(true); )
280 #endif
281