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