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/*
* Copyright 2016 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 "SkCodec.h"
#include "SkColorSpace.h"
#include "Test.h"
#include "png.h"
static SkStreamAsset* resource(const char path[]) {
SkString fullPath = GetResourcePath(path);
return SkStream::NewFromFile(fullPath.c_str());
}
static bool almost_equal(float a, float b) {
return SkTAbs(a - b) < 0.001f;
}
DEF_TEST(ColorSpaceParsePngICCProfile, r) {
SkAutoTDelete<SkStream> stream(resource("color_wheel_with_profile.png"));
REPORTER_ASSERT(r, nullptr != stream);
if (!stream) {
return;
}
SkAutoTDelete<SkCodec> codec(SkCodec::NewFromStream(stream.release()));
REPORTER_ASSERT(r, nullptr != codec);
#if (PNG_LIBPNG_VER_MAJOR > 1) || (PNG_LIBPNG_VER_MAJOR == 1 && PNG_LIBPNG_VER_MINOR >= 6)
SkColorSpace* colorSpace = codec->getColorSpace();
REPORTER_ASSERT(r, nullptr != colorSpace);
// No need to use almost equal here. The color profile that we have extracted
// actually has a table of gammas. And our current implementation guesses 2.2f.
SkFloat3 gammas = colorSpace->gamma();
REPORTER_ASSERT(r, 2.2f == gammas.fVec[0]);
REPORTER_ASSERT(r, 2.2f == gammas.fVec[1]);
REPORTER_ASSERT(r, 2.2f == gammas.fVec[2]);
// These nine values were extracted from the color profile in isolation (before
// we embedded it in the png). Here we check that we still extract the same values.
SkFloat3x3 xyz = colorSpace->xyz();
REPORTER_ASSERT(r, almost_equal(0.436066f, xyz.fMat[0]));
REPORTER_ASSERT(r, almost_equal(0.222488f, xyz.fMat[1]));
REPORTER_ASSERT(r, almost_equal(0.013916f, xyz.fMat[2]));
REPORTER_ASSERT(r, almost_equal(0.385147f, xyz.fMat[3]));
REPORTER_ASSERT(r, almost_equal(0.716873f, xyz.fMat[4]));
REPORTER_ASSERT(r, almost_equal(0.0970764f, xyz.fMat[5]));
REPORTER_ASSERT(r, almost_equal(0.143066f, xyz.fMat[6]));
REPORTER_ASSERT(r, almost_equal(0.0606079f, xyz.fMat[7]));
REPORTER_ASSERT(r, almost_equal(0.714096f, xyz.fMat[8]));
#endif
}
DEF_TEST(ColorSpaceParseJpegICCProfile, r) {
SkAutoTDelete<SkStream> stream(resource("icc-v2-gbr.jpg"));
REPORTER_ASSERT(r, nullptr != stream);
if (!stream) {
return;
}
SkAutoTDelete<SkCodec> codec(SkCodec::NewFromStream(stream.release()));
REPORTER_ASSERT(r, nullptr != codec);
if (!codec) {
return;
}
SkColorSpace* colorSpace = codec->getColorSpace();
REPORTER_ASSERT(r, nullptr != colorSpace);
// It's important to use almost equal here. This profile sets gamma as
// 563 / 256, which actually comes out to about 2.19922.
SkFloat3 gammas = colorSpace->gamma();
REPORTER_ASSERT(r, almost_equal(2.2f, gammas.fVec[0]));
REPORTER_ASSERT(r, almost_equal(2.2f, gammas.fVec[1]));
REPORTER_ASSERT(r, almost_equal(2.2f, gammas.fVec[2]));
// These nine values were extracted from the color profile. Until we know any
// better, we'll assume these are the right values and test that we continue
// to extract them properly.
SkFloat3x3 xyz = colorSpace->xyz();
REPORTER_ASSERT(r, almost_equal(0.385117f, xyz.fMat[0]));
REPORTER_ASSERT(r, almost_equal(0.716904f, xyz.fMat[1]));
REPORTER_ASSERT(r, almost_equal(0.0970612f, xyz.fMat[2]));
REPORTER_ASSERT(r, almost_equal(0.143051f, xyz.fMat[3]));
REPORTER_ASSERT(r, almost_equal(0.0606079f, xyz.fMat[4]));
REPORTER_ASSERT(r, almost_equal(0.713913f, xyz.fMat[5]));
REPORTER_ASSERT(r, almost_equal(0.436035f, xyz.fMat[6]));
REPORTER_ASSERT(r, almost_equal(0.222488f, xyz.fMat[7]));
REPORTER_ASSERT(r, almost_equal(0.013916f, xyz.fMat[8]));
}
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