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// Copyright 2014 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fxcodec/icc/icc_transform.h"
#include <stdint.h>
#include <algorithm>
#include <memory>
#include "core/fxcrt/data_vector.h"
#include "third_party/base/cxx17_backports.h"
#include "third_party/base/notreached.h"
#include "third_party/base/numerics/safe_conversions.h"
#include "third_party/base/ptr_util.h"
namespace fxcodec {
namespace {
// For use with std::unique_ptr<cmsHPROFILE>.
struct CmsProfileDeleter {
inline void operator()(cmsHPROFILE p) { cmsCloseProfile(p); }
};
using ScopedCmsProfile = std::unique_ptr<void, CmsProfileDeleter>;
bool Check3Components(cmsColorSpaceSignature cs) {
switch (cs) {
case cmsSigGrayData:
case cmsSigCmykData:
return false;
default:
return true;
}
}
} // namespace
IccTransform::IccTransform(cmsHTRANSFORM hTransform,
int srcComponents,
bool bIsLab,
bool bNormal)
: m_hTransform(hTransform),
m_nSrcComponents(srcComponents),
m_bLab(bIsLab),
m_bNormal(bNormal) {}
IccTransform::~IccTransform() {
cmsDeleteTransform(m_hTransform);
}
// static
std::unique_ptr<IccTransform> IccTransform::CreateTransformSRGB(
pdfium::span<const uint8_t> span) {
ScopedCmsProfile srcProfile(cmsOpenProfileFromMem(
span.data(), pdfium::base::checked_cast<cmsUInt32Number>(span.size())));
if (!srcProfile)
return nullptr;
ScopedCmsProfile dstProfile(cmsCreate_sRGBProfile());
if (!dstProfile)
return nullptr;
cmsColorSpaceSignature srcCS = cmsGetColorSpace(srcProfile.get());
uint32_t nSrcComponents = cmsChannelsOf(srcCS);
// According to PDF spec, number of components must be 1, 3, or 4.
if (nSrcComponents != 1 && nSrcComponents != 3 && nSrcComponents != 4)
return nullptr;
int srcFormat;
bool bLab = false;
bool bNormal = false;
if (srcCS == cmsSigLabData) {
srcFormat =
COLORSPACE_SH(PT_Lab) | CHANNELS_SH(nSrcComponents) | BYTES_SH(0);
bLab = true;
} else {
srcFormat =
COLORSPACE_SH(PT_ANY) | CHANNELS_SH(nSrcComponents) | BYTES_SH(1);
// TODO(thestig): Check to see if lcms2 supports more colorspaces that can
// be considered normal.
bNormal = srcCS == cmsSigGrayData || srcCS == cmsSigRgbData ||
srcCS == cmsSigCmykData;
}
cmsColorSpaceSignature dstCS = cmsGetColorSpace(dstProfile.get());
if (!Check3Components(dstCS))
return nullptr;
cmsHTRANSFORM hTransform = nullptr;
switch (dstCS) {
case cmsSigRgbData:
hTransform =
cmsCreateTransform(srcProfile.get(), srcFormat, dstProfile.get(),
TYPE_BGR_8, INTENT_PERCEPTUAL, /*dwFlags=*/0);
break;
case cmsSigGrayData:
case cmsSigCmykData:
// Check3Components() already filtered these types.
NOTREACHED_NORETURN();
default:
break;
}
if (!hTransform)
return nullptr;
// Private ctor.
return pdfium::WrapUnique(
new IccTransform(hTransform, nSrcComponents, bLab, bNormal));
}
void IccTransform::Translate(pdfium::span<const float> pSrcValues,
pdfium::span<float> pDestValues) {
uint8_t output[4];
// TODO(npm): Currently the CmsDoTransform method is part of LCMS and it will
// apply some member of m_hTransform to the input. We need to go over all the
// places which set transform to verify that only `pSrcValues.size()`
// components are used.
if (m_bLab) {
DataVector<double> inputs(std::max<size_t>(pSrcValues.size(), 16));
for (uint32_t i = 0; i < pSrcValues.size(); ++i)
inputs[i] = pSrcValues[i];
cmsDoTransform(m_hTransform, inputs.data(), output, 1);
} else {
DataVector<uint8_t> inputs(std::max<size_t>(pSrcValues.size(), 16));
for (size_t i = 0; i < pSrcValues.size(); ++i) {
inputs[i] =
pdfium::clamp(static_cast<int>(pSrcValues[i] * 255.0f), 0, 255);
}
cmsDoTransform(m_hTransform, inputs.data(), output, 1);
}
pDestValues[0] = output[2] / 255.0f;
pDestValues[1] = output[1] / 255.0f;
pDestValues[2] = output[0] / 255.0f;
}
void IccTransform::TranslateScanline(pdfium::span<uint8_t> pDest,
pdfium::span<const uint8_t> pSrc,
int32_t pixels) {
cmsDoTransform(m_hTransform, pSrc.data(), pDest.data(), pixels);
}
} // namespace fxcodec
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