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