1 /*
2 * Copyright 2017 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 "Resources.h"
9 #include "Test.h"
10
11 #include "SkBitmap.h"
12 #include "SkColorPriv.h"
13 #include "SkEncodedImageFormat.h"
14 #include "SkImage.h"
15 #include "SkJpegEncoder.h"
16 #include "SkPngEncoder.h"
17 #include "SkStream.h"
18 #include "SkWebpEncoder.h"
19
20 #include "png.h"
21
22 #include <algorithm>
23 #include <string>
24 #include <vector>
25
encode(SkEncodedImageFormat format,SkWStream * dst,const SkPixmap & src)26 static bool encode(SkEncodedImageFormat format, SkWStream* dst, const SkPixmap& src) {
27 switch (format) {
28 case SkEncodedImageFormat::kJPEG:
29 return SkJpegEncoder::Encode(dst, src, SkJpegEncoder::Options());
30 case SkEncodedImageFormat::kPNG:
31 return SkPngEncoder::Encode(dst, src, SkPngEncoder::Options());
32 default:
33 return false;
34 }
35 }
36
make(SkEncodedImageFormat format,SkWStream * dst,const SkPixmap & src)37 static std::unique_ptr<SkEncoder> make(SkEncodedImageFormat format, SkWStream* dst,
38 const SkPixmap& src) {
39 switch (format) {
40 case SkEncodedImageFormat::kJPEG:
41 return SkJpegEncoder::Make(dst, src, SkJpegEncoder::Options());
42 case SkEncodedImageFormat::kPNG:
43 return SkPngEncoder::Make(dst, src, SkPngEncoder::Options());
44 default:
45 return nullptr;
46 }
47 }
48
test_encode(skiatest::Reporter * r,SkEncodedImageFormat format)49 static void test_encode(skiatest::Reporter* r, SkEncodedImageFormat format) {
50 SkBitmap bitmap;
51 bool success = GetResourceAsBitmap("images/mandrill_128.png", &bitmap);
52 if (!success) {
53 return;
54 }
55
56 SkPixmap src;
57 success = bitmap.peekPixels(&src);
58 REPORTER_ASSERT(r, success);
59 if (!success) {
60 return;
61 }
62
63 SkDynamicMemoryWStream dst0, dst1, dst2, dst3;
64 success = encode(format, &dst0, src);
65 REPORTER_ASSERT(r, success);
66
67 auto encoder1 = make(format, &dst1, src);
68 for (int i = 0; i < src.height(); i++) {
69 success = encoder1->encodeRows(1);
70 REPORTER_ASSERT(r, success);
71 }
72
73 auto encoder2 = make(format, &dst2, src);
74 for (int i = 0; i < src.height(); i+=3) {
75 success = encoder2->encodeRows(3);
76 REPORTER_ASSERT(r, success);
77 }
78
79 auto encoder3 = make(format, &dst3, src);
80 success = encoder3->encodeRows(200);
81 REPORTER_ASSERT(r, success);
82
83 sk_sp<SkData> data0 = dst0.detachAsData();
84 sk_sp<SkData> data1 = dst1.detachAsData();
85 sk_sp<SkData> data2 = dst2.detachAsData();
86 sk_sp<SkData> data3 = dst3.detachAsData();
87 REPORTER_ASSERT(r, data0->equals(data1.get()));
88 REPORTER_ASSERT(r, data0->equals(data2.get()));
89 REPORTER_ASSERT(r, data0->equals(data3.get()));
90 }
91
DEF_TEST(Encode,r)92 DEF_TEST(Encode, r) {
93 test_encode(r, SkEncodedImageFormat::kJPEG);
94 test_encode(r, SkEncodedImageFormat::kPNG);
95 }
96
almost_equals(SkPMColor a,SkPMColor b,int tolerance)97 static inline bool almost_equals(SkPMColor a, SkPMColor b, int tolerance) {
98 if (SkTAbs((int)SkGetPackedR32(a) - (int)SkGetPackedR32(b)) > tolerance) {
99 return false;
100 }
101
102 if (SkTAbs((int)SkGetPackedG32(a) - (int)SkGetPackedG32(b)) > tolerance) {
103 return false;
104 }
105
106 if (SkTAbs((int)SkGetPackedB32(a) - (int)SkGetPackedB32(b)) > tolerance) {
107 return false;
108 }
109
110 if (SkTAbs((int)SkGetPackedA32(a) - (int)SkGetPackedA32(b)) > tolerance) {
111 return false;
112 }
113
114 return true;
115 }
116
almost_equals(const SkBitmap & a,const SkBitmap & b,int tolerance)117 static inline bool almost_equals(const SkBitmap& a, const SkBitmap& b, int tolerance) {
118 if (a.info() != b.info()) {
119 return false;
120 }
121
122 SkASSERT(kN32_SkColorType == a.colorType());
123 for (int y = 0; y < a.height(); y++) {
124 for (int x = 0; x < a.width(); x++) {
125 if (!almost_equals(*a.getAddr32(x, y), *b.getAddr32(x, y), tolerance)) {
126 return false;
127 }
128 }
129 }
130
131 return true;
132 }
133
DEF_TEST(Encode_JpegDownsample,r)134 DEF_TEST(Encode_JpegDownsample, r) {
135 SkBitmap bitmap;
136 bool success = GetResourceAsBitmap("images/mandrill_128.png", &bitmap);
137 if (!success) {
138 return;
139 }
140
141 SkPixmap src;
142 success = bitmap.peekPixels(&src);
143 REPORTER_ASSERT(r, success);
144 if (!success) {
145 return;
146 }
147
148 SkDynamicMemoryWStream dst0, dst1, dst2;
149 SkJpegEncoder::Options options;
150 success = SkJpegEncoder::Encode(&dst0, src, options);
151 REPORTER_ASSERT(r, success);
152
153 options.fDownsample = SkJpegEncoder::Downsample::k422;
154 success = SkJpegEncoder::Encode(&dst1, src, options);
155 REPORTER_ASSERT(r, success);
156
157 options.fDownsample = SkJpegEncoder::Downsample::k444;
158 success = SkJpegEncoder::Encode(&dst2, src, options);
159 REPORTER_ASSERT(r, success);
160
161 sk_sp<SkData> data0 = dst0.detachAsData();
162 sk_sp<SkData> data1 = dst1.detachAsData();
163 sk_sp<SkData> data2 = dst2.detachAsData();
164 REPORTER_ASSERT(r, data0->size() < data1->size());
165 REPORTER_ASSERT(r, data1->size() < data2->size());
166
167 SkBitmap bm0, bm1, bm2;
168 SkImage::MakeFromEncoded(data0)->asLegacyBitmap(&bm0);
169 SkImage::MakeFromEncoded(data1)->asLegacyBitmap(&bm1);
170 SkImage::MakeFromEncoded(data2)->asLegacyBitmap(&bm2);
171 REPORTER_ASSERT(r, almost_equals(bm0, bm1, 60));
172 REPORTER_ASSERT(r, almost_equals(bm1, bm2, 60));
173 }
174
pushComment(std::vector<std::string> & comments,const char * keyword,const char * text)175 static inline void pushComment(
176 std::vector<std::string>& comments, const char* keyword, const char* text) {
177 comments.push_back(keyword);
178 comments.push_back(text);
179 }
180
testPngComments(const SkPixmap & src,SkPngEncoder::Options & options,skiatest::Reporter * r)181 static void testPngComments(const SkPixmap& src, SkPngEncoder::Options& options,
182 skiatest::Reporter* r) {
183 std::vector<std::string> commentStrings;
184 pushComment(commentStrings, "key", "text");
185 pushComment(commentStrings, "test", "something");
186 pushComment(commentStrings, "have some", "spaces in both");
187
188 std::string longKey(PNG_KEYWORD_MAX_LENGTH, 'x');
189 #ifdef SK_DEBUG
190 commentStrings.push_back(longKey);
191 #else
192 // We call SkDEBUGFAILF it the key is too long so we'll only test this in release mode.
193 commentStrings.push_back(longKey + "x");
194 #endif
195 commentStrings.push_back("");
196
197 std::vector<const char*> commentPointers;
198 std::vector<size_t> commentSizes;
199 for(auto& str : commentStrings) {
200 commentPointers.push_back(str.c_str());
201 commentSizes.push_back(str.length() + 1);
202 }
203
204 options.fComments = SkDataTable::MakeCopyArrays((void const *const *)commentPointers.data(),
205 commentSizes.data(), commentStrings.size());
206
207
208 SkDynamicMemoryWStream dst;
209 bool success = SkPngEncoder::Encode(&dst, src, options);
210 REPORTER_ASSERT(r, success);
211
212 std::vector<char> output(dst.bytesWritten());
213 dst.copyTo(output.data());
214
215 // Each chunk is of the form length (4 bytes), chunk type (tEXt), data,
216 // checksum (4 bytes). Make sure we find all of them in the encoded
217 // results.
218 const char kExpected1[] =
219 "\x00\x00\x00\x08tEXtkey\x00text\x9e\xe7\x66\x51";
220 const char kExpected2[] =
221 "\x00\x00\x00\x0etEXttest\x00something\x29\xba\xef\xac";
222 const char kExpected3[] =
223 "\x00\x00\x00\x18tEXthave some\x00spaces in both\x8d\x69\x34\x2d";
224 std::string longKeyRecord = "tEXt" + longKey; // A snippet of our long key comment
225 std::string tooLongRecord = "tExt" + longKey + "x"; // A snippet whose key is too long
226
227 auto search1 = std::search(output.begin(), output.end(),
228 kExpected1, kExpected1 + sizeof(kExpected1));
229 auto search2 = std::search(output.begin(), output.end(),
230 kExpected2, kExpected2 + sizeof(kExpected2));
231 auto search3 = std::search(output.begin(), output.end(),
232 kExpected3, kExpected3 + sizeof(kExpected3));
233 auto search4 = std::search(output.begin(), output.end(),
234 longKeyRecord.begin(), longKeyRecord.end());
235 auto search5 = std::search(output.begin(), output.end(),
236 tooLongRecord.begin(), tooLongRecord.end());
237
238 REPORTER_ASSERT(r, search1 != output.end());
239 REPORTER_ASSERT(r, search2 != output.end());
240 REPORTER_ASSERT(r, search3 != output.end());
241 REPORTER_ASSERT(r, search4 != output.end());
242 REPORTER_ASSERT(r, search5 == output.end());
243 // Comments test ends
244 }
245
DEF_TEST(Encode_PngOptions,r)246 DEF_TEST(Encode_PngOptions, r) {
247 SkBitmap bitmap;
248 bool success = GetResourceAsBitmap("images/mandrill_128.png", &bitmap);
249 if (!success) {
250 return;
251 }
252
253 SkPixmap src;
254 success = bitmap.peekPixels(&src);
255 REPORTER_ASSERT(r, success);
256 if (!success) {
257 return;
258 }
259
260 SkDynamicMemoryWStream dst0, dst1, dst2;
261 SkPngEncoder::Options options;
262 success = SkPngEncoder::Encode(&dst0, src, options);
263 REPORTER_ASSERT(r, success);
264
265 options.fFilterFlags = SkPngEncoder::FilterFlag::kUp;
266 success = SkPngEncoder::Encode(&dst1, src, options);
267 REPORTER_ASSERT(r, success);
268
269 options.fZLibLevel = 3;
270 success = SkPngEncoder::Encode(&dst2, src, options);
271 REPORTER_ASSERT(r, success);
272
273 testPngComments(src, options, r);
274
275 sk_sp<SkData> data0 = dst0.detachAsData();
276 sk_sp<SkData> data1 = dst1.detachAsData();
277 sk_sp<SkData> data2 = dst2.detachAsData();
278 REPORTER_ASSERT(r, data0->size() < data1->size());
279 REPORTER_ASSERT(r, data1->size() < data2->size());
280
281 SkBitmap bm0, bm1, bm2;
282 SkImage::MakeFromEncoded(data0)->asLegacyBitmap(&bm0);
283 SkImage::MakeFromEncoded(data1)->asLegacyBitmap(&bm1);
284 SkImage::MakeFromEncoded(data2)->asLegacyBitmap(&bm2);
285 REPORTER_ASSERT(r, almost_equals(bm0, bm1, 0));
286 REPORTER_ASSERT(r, almost_equals(bm0, bm2, 0));
287 }
288
DEF_TEST(Encode_WebpOptions,r)289 DEF_TEST(Encode_WebpOptions, r) {
290 SkBitmap bitmap;
291 bool success = GetResourceAsBitmap("images/google_chrome.ico", &bitmap);
292 if (!success) {
293 return;
294 }
295
296 SkPixmap src;
297 success = bitmap.peekPixels(&src);
298 REPORTER_ASSERT(r, success);
299 if (!success) {
300 return;
301 }
302
303 SkDynamicMemoryWStream dst0, dst1, dst2, dst3;
304 SkWebpEncoder::Options options;
305 options.fCompression = SkWebpEncoder::Compression::kLossless;
306 options.fQuality = 0.0f;
307 success = SkWebpEncoder::Encode(&dst0, src, options);
308 REPORTER_ASSERT(r, success);
309
310 options.fQuality = 100.0f;
311 success = SkWebpEncoder::Encode(&dst1, src, options);
312 REPORTER_ASSERT(r, success);
313
314 options.fCompression = SkWebpEncoder::Compression::kLossy;
315 options.fQuality = 100.0f;
316 success = SkWebpEncoder::Encode(&dst2, src, options);
317 REPORTER_ASSERT(r, success);
318
319 options.fCompression = SkWebpEncoder::Compression::kLossy;
320 options.fQuality = 50.0f;
321 success = SkWebpEncoder::Encode(&dst3, src, options);
322 REPORTER_ASSERT(r, success);
323
324 sk_sp<SkData> data0 = dst0.detachAsData();
325 sk_sp<SkData> data1 = dst1.detachAsData();
326 sk_sp<SkData> data2 = dst2.detachAsData();
327 sk_sp<SkData> data3 = dst3.detachAsData();
328 REPORTER_ASSERT(r, data0->size() > data1->size());
329 REPORTER_ASSERT(r, data1->size() > data2->size());
330 REPORTER_ASSERT(r, data2->size() > data3->size());
331
332 SkBitmap bm0, bm1, bm2, bm3;
333 SkImage::MakeFromEncoded(data0)->asLegacyBitmap(&bm0);
334 SkImage::MakeFromEncoded(data1)->asLegacyBitmap(&bm1);
335 SkImage::MakeFromEncoded(data2)->asLegacyBitmap(&bm2);
336 SkImage::MakeFromEncoded(data3)->asLegacyBitmap(&bm3);
337 REPORTER_ASSERT(r, almost_equals(bm0, bm1, 0));
338 REPORTER_ASSERT(r, almost_equals(bm0, bm2, 90));
339 REPORTER_ASSERT(r, almost_equals(bm2, bm3, 50));
340 }
341
