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 "include/core/SkBitmap.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkColor.h"
11 #include "include/core/SkImage.h"
12 #include "include/core/SkMatrix.h"
13 #include "include/core/SkPaint.h"
14 #include "include/core/SkPath.h"
15 #include "include/core/SkRect.h"
16 #include "include/core/SkScalar.h"
17 #include "include/core/SkShader.h"
18 #include "include/core/SkSize.h"
19 #include "include/core/SkTileMode.h"
20 #include "include/core/SkTypes.h"
21 #include "include/utils/SkRandom.h"
22 #include "src/core/SkMatrixUtils.h"
23 #include "tests/Test.h"
24
25 ///////////////////////////////////////////////////////////////////////////////
26
rand_matrix(SkMatrix * mat,SkRandom & rand,unsigned mask)27 static void rand_matrix(SkMatrix* mat, SkRandom& rand, unsigned mask) {
28 mat->setIdentity();
29 if (mask & SkMatrix::kTranslate_Mask) {
30 mat->postTranslate(rand.nextSScalar1(), rand.nextSScalar1());
31 }
32 if (mask & SkMatrix::kScale_Mask) {
33 mat->postScale(rand.nextSScalar1(), rand.nextSScalar1());
34 }
35 if (mask & SkMatrix::kAffine_Mask) {
36 mat->postRotate(rand.nextSScalar1() * 360);
37 }
38 if (mask & SkMatrix::kPerspective_Mask) {
39 mat->setPerspX(rand.nextSScalar1());
40 mat->setPerspY(rand.nextSScalar1());
41 }
42 }
43
rand_size(SkISize * size,SkRandom & rand)44 static void rand_size(SkISize* size, SkRandom& rand) {
45 size->set(rand.nextU() & 0xFFFF, rand.nextU() & 0xFFFF);
46 }
47
test_treatAsSprite(skiatest::Reporter * reporter)48 static void test_treatAsSprite(skiatest::Reporter* reporter) {
49
50 SkMatrix mat;
51 SkISize size;
52 SkRandom rand;
53
54 SkPaint noaaPaint;
55 SkPaint aaPaint;
56 aaPaint.setAntiAlias(true);
57
58 const SkSamplingOptions sampling;
59
60 // assert: translate-only no-aa can always be treated as sprite
61 for (int i = 0; i < 1000; ++i) {
62 rand_matrix(&mat, rand, SkMatrix::kTranslate_Mask);
63 for (int j = 0; j < 1000; ++j) {
64 rand_size(&size, rand);
65 REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, sampling, noaaPaint));
66 }
67 }
68
69 // assert: rotate/perspect is never treated as sprite
70 for (int i = 0; i < 1000; ++i) {
71 rand_matrix(&mat, rand, SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask);
72 for (int j = 0; j < 1000; ++j) {
73 rand_size(&size, rand);
74 REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, sampling, noaaPaint));
75 REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, sampling, aaPaint));
76 }
77 }
78
79 size.set(500, 600);
80
81 const SkScalar tooMuchSubpixel = 100.1f;
82 mat.setTranslate(tooMuchSubpixel, 0);
83 REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, sampling, aaPaint));
84 mat.setTranslate(0, tooMuchSubpixel);
85 REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, sampling, aaPaint));
86
87 const SkScalar tinySubPixel = 100.02f;
88 mat.setTranslate(tinySubPixel, 0);
89 REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, sampling, aaPaint));
90 mat.setTranslate(0, tinySubPixel);
91 REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, sampling, aaPaint));
92
93 const SkScalar twoThirds = SK_Scalar1 * 2 / 3;
94 const SkScalar bigScale = (size.width() + twoThirds) / size.width();
95 mat.setScale(bigScale, bigScale);
96 REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, sampling, noaaPaint));
97 REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, sampling, aaPaint));
98
99 const SkScalar oneThird = SK_Scalar1 / 3;
100 const SkScalar smallScale = (size.width() + oneThird) / size.width();
101 mat.setScale(smallScale, smallScale);
102 REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, sampling, noaaPaint));
103 REPORTER_ASSERT(reporter, !SkTreatAsSprite(mat, size, sampling, aaPaint));
104
105 const SkScalar oneFortyth = SK_Scalar1 / 40;
106 const SkScalar tinyScale = (size.width() + oneFortyth) / size.width();
107 mat.setScale(tinyScale, tinyScale);
108 REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, sampling, noaaPaint));
109 REPORTER_ASSERT(reporter, SkTreatAsSprite(mat, size, sampling, aaPaint));
110 }
111
test_wacky_bitmapshader(skiatest::Reporter * reporter,int width,int height)112 static void test_wacky_bitmapshader(skiatest::Reporter* reporter,
113 int width, int height) {
114 SkBitmap dev;
115 dev.allocN32Pixels(0x56F, 0x4f6);
116 dev.eraseColor(SK_ColorTRANSPARENT); // necessary, so we know if we draw to it
117
118 SkMatrix matrix;
119
120 SkCanvas c(dev);
121 matrix.setAll(-119.34097f,
122 -43.436558f,
123 93489.945f,
124 43.436558f,
125 -119.34097f,
126 123.98426f,
127 0, 0, SK_Scalar1);
128 c.concat(matrix);
129
130 SkBitmap bm;
131 if (bm.tryAllocN32Pixels(width, height)) {
132 bm.eraseColor(SK_ColorRED);
133 } else {
134 SkASSERT(false);
135 return;
136 }
137
138 matrix.setAll(0.0078740157f,
139 0,
140 SkIntToScalar(249),
141 0,
142 0.0078740157f,
143 SkIntToScalar(239),
144 0, 0, SK_Scalar1);
145 SkPaint paint;
146 paint.setShader(bm.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat,
147 SkSamplingOptions(), matrix));
148
149 SkRect r = SkRect::MakeXYWH(681, 239, 695, 253);
150 c.drawRect(r, paint);
151
152 for (int y = 0; y < dev.height(); ++y) {
153 for (int x = 0; x < dev.width(); ++x) {
154 if (SK_ColorTRANSPARENT == *dev.getAddr32(x, y)) {
155 REPORTER_ASSERT(reporter, false);
156 return;
157 }
158 }
159 }
160 }
161
162 // ATTENTION We should always draw each of these sizes safely now. ATTENTION
163 // ATTENTION I'm leaving this next /*comment*/ for posterity. ATTENTION
164
165 /*
166 * Original bug was asserting that the matrix-proc had generated a (Y) value
167 * that was out of range. This led (in the release build) to the sampler-proc
168 * reading memory out-of-bounds of the original bitmap.
169 *
170 * We were numerically overflowing our 16bit coordinates that we communicate
171 * between these two procs. The fixes was in two parts:
172 *
173 * 1. Just don't draw bitmaps larger than 64K-1 in width or height, since we
174 * can't represent those coordinates in our transport format (yet).
175 * 2. Perform an unsigned shift during the calculation, so we don't get
176 * sign-extension bleed when packing the two values (X,Y) into our 32bit
177 * slot.
178 *
179 * This tests exercises the original setup, plus 2 more to ensure that we can,
180 * in fact, handle bitmaps at 64K-1 (assuming we don't exceed the total
181 * memory allocation limit).
182 */
test_giantrepeat_crbug118018(skiatest::Reporter * reporter)183 static void test_giantrepeat_crbug118018(skiatest::Reporter* reporter) {
184 static const struct {
185 int fWidth;
186 int fHeight;
187 } gTests[] = {
188 { 0x1b294, 0x7f}, // crbug 118018 (width exceeds 64K)... should draw safely now.
189 { 0xFFFF, 0x7f }, // should draw, test max width
190 { 0x7f, 0xFFFF }, // should draw, test max height
191 };
192
193 for (size_t i = 0; i < SK_ARRAY_COUNT(gTests); ++i) {
194 test_wacky_bitmapshader(reporter,
195 gTests[i].fWidth, gTests[i].fHeight);
196 }
197 }
198
199 ///////////////////////////////////////////////////////////////////////////////
200
test_nan_antihair()201 static void test_nan_antihair() {
202 SkBitmap bm;
203 bm.allocN32Pixels(20, 20);
204
205 SkCanvas canvas(bm);
206
207 SkPath path;
208 path.moveTo(0, 0);
209 path.lineTo(10, SK_ScalarNaN);
210
211 SkPaint paint;
212 paint.setAntiAlias(true);
213 paint.setStyle(SkPaint::kStroke_Style);
214
215 // before our fix to SkScan_Antihair.cpp to check for integral NaN (0x800...)
216 // this would trigger an assert/crash.
217 //
218 // see rev. 3558
219 canvas.drawPath(path, paint);
220 }
221
check_for_all_zeros(const SkBitmap & bm)222 static bool check_for_all_zeros(const SkBitmap& bm) {
223 size_t count = bm.width() * bm.bytesPerPixel();
224 for (int y = 0; y < bm.height(); y++) {
225 const uint8_t* ptr = reinterpret_cast<const uint8_t*>(bm.getAddr(0, y));
226 for (size_t i = 0; i < count; i++) {
227 if (ptr[i]) {
228 return false;
229 }
230 }
231 }
232 return true;
233 }
234
235 static const int gWidth = 256;
236 static const int gHeight = 256;
237
create(SkBitmap * bm,SkColor color)238 static void create(SkBitmap* bm, SkColor color) {
239 bm->allocN32Pixels(gWidth, gHeight);
240 bm->eraseColor(color);
241 }
242
DEF_TEST(DrawBitmapRect,reporter)243 DEF_TEST(DrawBitmapRect, reporter) {
244 SkBitmap src, dst;
245
246 create(&src, 0xFFFFFFFF);
247 create(&dst, 0);
248
249 SkCanvas canvas(dst);
250
251 SkRect srcR = { gWidth, 0, gWidth + 16, 16 };
252 SkRect dstR = { 0, 0, 16, 16 };
253
254 canvas.drawImageRect(src.asImage(), srcR, dstR, SkSamplingOptions(), nullptr,
255 SkCanvas::kStrict_SrcRectConstraint);
256
257 // ensure that we draw nothing if srcR does not intersect the bitmap
258 REPORTER_ASSERT(reporter, check_for_all_zeros(dst));
259
260 test_nan_antihair();
261 test_giantrepeat_crbug118018(reporter);
262
263 test_treatAsSprite(reporter);
264 }
265