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// Copyright 2014 PDFium Authors. All rights reserved.
// 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/fpdfapi/page/cpdf_devicecs.h"
#include <limits.h>
#include <algorithm>
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_document.h"
#include "core/fpdfapi/parser/cpdf_stream_acc.h"
#include "core/fpdfapi/parser/cpdf_string.h"
#include "core/fxcodec/fx_codec.h"
#include "third_party/base/logging.h"
#include "third_party/base/stl_util.h"
namespace {
float NormalizeChannel(float fVal) {
return pdfium::clamp(fVal, 0.0f, 1.0f);
}
} // namespace
uint32_t ComponentsForFamily(int family) {
if (family == PDFCS_DEVICERGB)
return 3;
if (family == PDFCS_DEVICEGRAY)
return 1;
ASSERT(family == PDFCS_DEVICECMYK);
return 4;
}
void ReverseRGB(uint8_t* pDestBuf, const uint8_t* pSrcBuf, int pixels) {
if (pDestBuf == pSrcBuf) {
for (int i = 0; i < pixels; i++) {
uint8_t temp = pDestBuf[2];
pDestBuf[2] = pDestBuf[0];
pDestBuf[0] = temp;
pDestBuf += 3;
}
} else {
for (int i = 0; i < pixels; i++) {
*pDestBuf++ = pSrcBuf[2];
*pDestBuf++ = pSrcBuf[1];
*pDestBuf++ = pSrcBuf[0];
pSrcBuf += 3;
}
}
}
CPDF_DeviceCS::CPDF_DeviceCS(int family)
: CPDF_ColorSpace(nullptr, family, ComponentsForFamily(family)) {
ASSERT(family == PDFCS_DEVICEGRAY || family == PDFCS_DEVICERGB ||
family == PDFCS_DEVICECMYK);
}
CPDF_DeviceCS::~CPDF_DeviceCS() {}
bool CPDF_DeviceCS::GetRGB(float* pBuf, float* R, float* G, float* B) const {
switch (m_Family) {
case PDFCS_DEVICEGRAY:
*R = NormalizeChannel(*pBuf);
*G = *R;
*B = *R;
return true;
case PDFCS_DEVICERGB:
*R = NormalizeChannel(pBuf[0]);
*G = NormalizeChannel(pBuf[1]);
*B = NormalizeChannel(pBuf[2]);
return true;
case PDFCS_DEVICECMYK:
if (m_dwStdConversion) {
float k = pBuf[3];
*R = 1.0f - std::min(1.0f, pBuf[0] + k);
*G = 1.0f - std::min(1.0f, pBuf[1] + k);
*B = 1.0f - std::min(1.0f, pBuf[2] + k);
} else {
std::tie(*R, *G, *B) = AdobeCMYK_to_sRGB(
NormalizeChannel(pBuf[0]), NormalizeChannel(pBuf[1]),
NormalizeChannel(pBuf[2]), NormalizeChannel(pBuf[3]));
}
return true;
default:
NOTREACHED();
return false;
}
}
void CPDF_DeviceCS::TranslateImageLine(uint8_t* pDestBuf,
const uint8_t* pSrcBuf,
int pixels,
int image_width,
int image_height,
bool bTransMask) const {
switch (m_Family) {
case PDFCS_DEVICEGRAY:
for (int i = 0; i < pixels; i++) {
*pDestBuf++ = pSrcBuf[i];
*pDestBuf++ = pSrcBuf[i];
*pDestBuf++ = pSrcBuf[i];
}
break;
case PDFCS_DEVICERGB:
ReverseRGB(pDestBuf, pSrcBuf, pixels);
break;
case PDFCS_DEVICECMYK:
if (bTransMask) {
for (int i = 0; i < pixels; i++) {
int k = 255 - pSrcBuf[3];
pDestBuf[0] = ((255 - pSrcBuf[0]) * k) / 255;
pDestBuf[1] = ((255 - pSrcBuf[1]) * k) / 255;
pDestBuf[2] = ((255 - pSrcBuf[2]) * k) / 255;
pDestBuf += 3;
pSrcBuf += 4;
}
} else {
for (int i = 0; i < pixels; i++) {
if (m_dwStdConversion) {
uint8_t k = pSrcBuf[3];
pDestBuf[2] = 255 - std::min(255, pSrcBuf[0] + k);
pDestBuf[1] = 255 - std::min(255, pSrcBuf[1] + k);
pDestBuf[0] = 255 - std::min(255, pSrcBuf[2] + k);
} else {
std::tie(pDestBuf[2], pDestBuf[1], pDestBuf[0]) =
AdobeCMYK_to_sRGB1(pSrcBuf[0], pSrcBuf[1], pSrcBuf[2],
pSrcBuf[3]);
}
pSrcBuf += 4;
pDestBuf += 3;
}
}
break;
default:
NOTREACHED();
break;
}
}
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