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skia2/tests/EncodeTest.cpp
Brian Osman b62f50cf76 Replace nearly all kRespect with kIgnore 
- Encoders and decoders always assume kIgnore.
- They are less opinionated about F16 and color space,
  we just trust the color space that's passed in, and
  put that directly in the image (no sRGB encoding).
- SkBitmap and SkPixmap read/write pixels functions were
  defaulting to kResepct, those are now always kIgnore.
- Many other bits of plumbing are simplified, and I
  added a default of kIgnore to SkImage::makeColorSpace,
  so we can phase out that argument entirely.
- Still need to add defaults to other public APIs that
  take SkTransferFunctionBehavior.

- This makes gold think that we've dramatically changed
  the contents of all F16 images, but that's because
  it doesn't understand the (now linear) color space
  that's embedded. Once we triage them all once, they
  will work fine (and they'll look perfect in the browser).

Bug: skia:
Change-Id: I62fa090f96cae1b67d181ce14bd91f34ff2ed747
Reviewed-on: https://skia-review.googlesource.com/140570
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
2018-07-12 20:54:14 +00:00

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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "Resources.h"
#include "Test.h"
#include "SkBitmap.h"
#include "SkColorPriv.h"
#include "SkEncodedImageFormat.h"
#include "SkImage.h"
#include "SkJpegEncoder.h"
#include "SkPngEncoder.h"
#include "SkStream.h"
#include "SkWebpEncoder.h"
#include "png.h"
#include <algorithm>
#include <string>
#include <vector>
static bool encode(SkEncodedImageFormat format, SkWStream* dst, const SkPixmap& src) {
switch (format) {
case SkEncodedImageFormat::kJPEG:
return SkJpegEncoder::Encode(dst, src, SkJpegEncoder::Options());
case SkEncodedImageFormat::kPNG:
return SkPngEncoder::Encode(dst, src, SkPngEncoder::Options());
default:
return false;
}
}
static std::unique_ptr<SkEncoder> make(SkEncodedImageFormat format, SkWStream* dst,
const SkPixmap& src) {
switch (format) {
case SkEncodedImageFormat::kJPEG:
return SkJpegEncoder::Make(dst, src, SkJpegEncoder::Options());
case SkEncodedImageFormat::kPNG:
return SkPngEncoder::Make(dst, src, SkPngEncoder::Options());
default:
return nullptr;
}
}
static void test_encode(skiatest::Reporter* r, SkEncodedImageFormat format) {
SkBitmap bitmap;
bool success = GetResourceAsBitmap("images/mandrill_128.png", &bitmap);
if (!success) {
return;
}
SkPixmap src;
success = bitmap.peekPixels(&src);
REPORTER_ASSERT(r, success);
if (!success) {
return;
}
SkDynamicMemoryWStream dst0, dst1, dst2, dst3;
success = encode(format, &dst0, src);
REPORTER_ASSERT(r, success);
auto encoder1 = make(format, &dst1, src);
for (int i = 0; i < src.height(); i++) {
success = encoder1->encodeRows(1);
REPORTER_ASSERT(r, success);
}
auto encoder2 = make(format, &dst2, src);
for (int i = 0; i < src.height(); i+=3) {
success = encoder2->encodeRows(3);
REPORTER_ASSERT(r, success);
}
auto encoder3 = make(format, &dst3, src);
success = encoder3->encodeRows(200);
REPORTER_ASSERT(r, success);
sk_sp<SkData> data0 = dst0.detachAsData();
sk_sp<SkData> data1 = dst1.detachAsData();
sk_sp<SkData> data2 = dst2.detachAsData();
sk_sp<SkData> data3 = dst3.detachAsData();
REPORTER_ASSERT(r, data0->equals(data1.get()));
REPORTER_ASSERT(r, data0->equals(data2.get()));
REPORTER_ASSERT(r, data0->equals(data3.get()));
}
DEF_TEST(Encode, r) {
test_encode(r, SkEncodedImageFormat::kJPEG);
test_encode(r, SkEncodedImageFormat::kPNG);
}
static inline bool almost_equals(SkPMColor a, SkPMColor b, int tolerance) {
if (SkTAbs((int)SkGetPackedR32(a) - (int)SkGetPackedR32(b)) > tolerance) {
return false;
}
if (SkTAbs((int)SkGetPackedG32(a) - (int)SkGetPackedG32(b)) > tolerance) {
return false;
}
if (SkTAbs((int)SkGetPackedB32(a) - (int)SkGetPackedB32(b)) > tolerance) {
return false;
}
if (SkTAbs((int)SkGetPackedA32(a) - (int)SkGetPackedA32(b)) > tolerance) {
return false;
}
return true;
}
static inline bool almost_equals(const SkBitmap& a, const SkBitmap& b, int tolerance) {
if (a.info() != b.info()) {
return false;
}
SkASSERT(kN32_SkColorType == a.colorType());
for (int y = 0; y < a.height(); y++) {
for (int x = 0; x < a.width(); x++) {
if (!almost_equals(*a.getAddr32(x, y), *b.getAddr32(x, y), tolerance)) {
return false;
}
}
}
return true;
}
DEF_TEST(Encode_JpegDownsample, r) {
SkBitmap bitmap;
bool success = GetResourceAsBitmap("images/mandrill_128.png", &bitmap);
if (!success) {
return;
}
SkPixmap src;
success = bitmap.peekPixels(&src);
REPORTER_ASSERT(r, success);
if (!success) {
return;
}
SkDynamicMemoryWStream dst0, dst1, dst2;
SkJpegEncoder::Options options;
success = SkJpegEncoder::Encode(&dst0, src, options);
REPORTER_ASSERT(r, success);
options.fDownsample = SkJpegEncoder::Downsample::k422;
success = SkJpegEncoder::Encode(&dst1, src, options);
REPORTER_ASSERT(r, success);
options.fDownsample = SkJpegEncoder::Downsample::k444;
success = SkJpegEncoder::Encode(&dst2, src, options);
REPORTER_ASSERT(r, success);
sk_sp<SkData> data0 = dst0.detachAsData();
sk_sp<SkData> data1 = dst1.detachAsData();
sk_sp<SkData> data2 = dst2.detachAsData();
REPORTER_ASSERT(r, data0->size() < data1->size());
REPORTER_ASSERT(r, data1->size() < data2->size());
SkBitmap bm0, bm1, bm2;
SkImage::MakeFromEncoded(data0)->asLegacyBitmap(&bm0);
SkImage::MakeFromEncoded(data1)->asLegacyBitmap(&bm1);
SkImage::MakeFromEncoded(data2)->asLegacyBitmap(&bm2);
REPORTER_ASSERT(r, almost_equals(bm0, bm1, 60));
REPORTER_ASSERT(r, almost_equals(bm1, bm2, 60));
}
static inline void pushComment(
std::vector<std::string>& comments, const char* keyword, const char* text) {
comments.push_back(keyword);
comments.push_back(text);
}
static void testPngComments(const SkPixmap& src, SkPngEncoder::Options& options,
skiatest::Reporter* r) {
std::vector<std::string> commentStrings;
pushComment(commentStrings, "key", "text");
pushComment(commentStrings, "test", "something");
pushComment(commentStrings, "have some", "spaces in both");
std::string longKey(PNG_KEYWORD_MAX_LENGTH, 'x');
#ifdef SK_DEBUG
commentStrings.push_back(longKey);
#else
// We call SkDEBUGFAILF it the key is too long so we'll only test this in release mode.
commentStrings.push_back(longKey + "x");
#endif
commentStrings.push_back("");
std::vector<const char*> commentPointers;
std::vector<size_t> commentSizes;
for(auto& str : commentStrings) {
commentPointers.push_back(str.c_str());
commentSizes.push_back(str.length() + 1);
}
options.fComments = SkDataTable::MakeCopyArrays((void const *const *)commentPointers.data(),
commentSizes.data(), commentStrings.size());
SkDynamicMemoryWStream dst;
bool success = SkPngEncoder::Encode(&dst, src, options);
REPORTER_ASSERT(r, success);
std::vector<char> output(dst.bytesWritten());
dst.copyTo(output.data());
// Each chunk is of the form length (4 bytes), chunk type (tEXt), data,
// checksum (4 bytes). Make sure we find all of them in the encoded
// results.
const char kExpected1[] =
"\x00\x00\x00\x08tEXtkey\x00text\x9e\xe7\x66\x51";
const char kExpected2[] =
"\x00\x00\x00\x0etEXttest\x00something\x29\xba\xef\xac";
const char kExpected3[] =
"\x00\x00\x00\x18tEXthave some\x00spaces in both\x8d\x69\x34\x2d";
std::string longKeyRecord = "tEXt" + longKey; // A snippet of our long key comment
std::string tooLongRecord = "tExt" + longKey + "x"; // A snippet whose key is too long
auto search1 = std::search(output.begin(), output.end(),
kExpected1, kExpected1 + sizeof(kExpected1));
auto search2 = std::search(output.begin(), output.end(),
kExpected2, kExpected2 + sizeof(kExpected2));
auto search3 = std::search(output.begin(), output.end(),
kExpected3, kExpected3 + sizeof(kExpected3));
auto search4 = std::search(output.begin(), output.end(),
longKeyRecord.begin(), longKeyRecord.end());
auto search5 = std::search(output.begin(), output.end(),
tooLongRecord.begin(), tooLongRecord.end());
REPORTER_ASSERT(r, search1 != output.end());
REPORTER_ASSERT(r, search2 != output.end());
REPORTER_ASSERT(r, search3 != output.end());
REPORTER_ASSERT(r, search4 != output.end());
REPORTER_ASSERT(r, search5 == output.end());
// Comments test ends
}
DEF_TEST(Encode_PngOptions, r) {
SkBitmap bitmap;
bool success = GetResourceAsBitmap("images/mandrill_128.png", &bitmap);
if (!success) {
return;
}
SkPixmap src;
success = bitmap.peekPixels(&src);
REPORTER_ASSERT(r, success);
if (!success) {
return;
}
SkDynamicMemoryWStream dst0, dst1, dst2;
SkPngEncoder::Options options;
success = SkPngEncoder::Encode(&dst0, src, options);
REPORTER_ASSERT(r, success);
options.fFilterFlags = SkPngEncoder::FilterFlag::kUp;
success = SkPngEncoder::Encode(&dst1, src, options);
REPORTER_ASSERT(r, success);
options.fZLibLevel = 3;
success = SkPngEncoder::Encode(&dst2, src, options);
REPORTER_ASSERT(r, success);
testPngComments(src, options, r);
sk_sp<SkData> data0 = dst0.detachAsData();
sk_sp<SkData> data1 = dst1.detachAsData();
sk_sp<SkData> data2 = dst2.detachAsData();
REPORTER_ASSERT(r, data0->size() < data1->size());
REPORTER_ASSERT(r, data1->size() < data2->size());
SkBitmap bm0, bm1, bm2;
SkImage::MakeFromEncoded(data0)->asLegacyBitmap(&bm0);
SkImage::MakeFromEncoded(data1)->asLegacyBitmap(&bm1);
SkImage::MakeFromEncoded(data2)->asLegacyBitmap(&bm2);
REPORTER_ASSERT(r, almost_equals(bm0, bm1, 0));
REPORTER_ASSERT(r, almost_equals(bm0, bm2, 0));
}
DEF_TEST(Encode_WebpOptions, r) {
SkBitmap bitmap;
bool success = GetResourceAsBitmap("images/google_chrome.ico", &bitmap);
if (!success) {
return;
}
SkPixmap src;
success = bitmap.peekPixels(&src);
REPORTER_ASSERT(r, success);
if (!success) {
return;
}
SkDynamicMemoryWStream dst0, dst1, dst2, dst3;
SkWebpEncoder::Options options;
options.fCompression = SkWebpEncoder::Compression::kLossless;
options.fQuality = 0.0f;
success = SkWebpEncoder::Encode(&dst0, src, options);
REPORTER_ASSERT(r, success);
options.fQuality = 100.0f;
success = SkWebpEncoder::Encode(&dst1, src, options);
REPORTER_ASSERT(r, success);
options.fCompression = SkWebpEncoder::Compression::kLossy;
options.fQuality = 100.0f;
success = SkWebpEncoder::Encode(&dst2, src, options);
REPORTER_ASSERT(r, success);
options.fCompression = SkWebpEncoder::Compression::kLossy;
options.fQuality = 50.0f;
success = SkWebpEncoder::Encode(&dst3, src, options);
REPORTER_ASSERT(r, success);
sk_sp<SkData> data0 = dst0.detachAsData();
sk_sp<SkData> data1 = dst1.detachAsData();
sk_sp<SkData> data2 = dst2.detachAsData();
sk_sp<SkData> data3 = dst3.detachAsData();
REPORTER_ASSERT(r, data0->size() > data1->size());
REPORTER_ASSERT(r, data1->size() > data2->size());
REPORTER_ASSERT(r, data2->size() > data3->size());
SkBitmap bm0, bm1, bm2, bm3;
SkImage::MakeFromEncoded(data0)->asLegacyBitmap(&bm0);
SkImage::MakeFromEncoded(data1)->asLegacyBitmap(&bm1);
SkImage::MakeFromEncoded(data2)->asLegacyBitmap(&bm2);
SkImage::MakeFromEncoded(data3)->asLegacyBitmap(&bm3);
REPORTER_ASSERT(r, almost_equals(bm0, bm1, 0));
REPORTER_ASSERT(r, almost_equals(bm0, bm2, 90));
REPORTER_ASSERT(r, almost_equals(bm2, bm3, 50));
}
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