blob: de4ee7401ff3258e018f22b86415ddded3169d66 [file] [log] [blame]
// Copyright 2017 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/render/cpdf_dibsource.h"
#include <algorithm>
#include <memory>
#include <utility>
#include <vector>
#include "core/fpdfapi/cpdf_modulemgr.h"
#include "core/fpdfapi/page/cpdf_docpagedata.h"
#include "core/fpdfapi/page/cpdf_image.h"
#include "core/fpdfapi/page/cpdf_imageobject.h"
#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/fpdf_parser_decode.h"
#include "core/fpdfapi/render/cpdf_pagerendercache.h"
#include "core/fpdfapi/render/cpdf_renderstatus.h"
#include "core/fxcodec/codec/cjpx_decoder.h"
#include "core/fxcodec/fx_codec.h"
#include "core/fxcrt/fx_safe_types.h"
#include "third_party/base/ptr_util.h"
namespace {
unsigned int GetBits8(const uint8_t* pData, uint64_t bitpos, size_t nbits) {
ASSERT(nbits == 1 || nbits == 2 || nbits == 4 || nbits == 8 || nbits == 16);
ASSERT((bitpos & (nbits - 1)) == 0);
unsigned int byte = pData[bitpos / 8];
if (nbits == 8)
return byte;
if (nbits == 16)
return byte * 256 + pData[bitpos / 8 + 1];
return (byte >> (8 - nbits - (bitpos % 8))) & ((1 << nbits) - 1);
}
FX_SAFE_UINT32 CalculatePitch8(uint32_t bpc, uint32_t components, int width) {
FX_SAFE_UINT32 pitch = bpc;
pitch *= components;
pitch *= width;
pitch += 7;
pitch /= 8;
return pitch;
}
FX_SAFE_UINT32 CalculatePitch32(int bpp, int width) {
FX_SAFE_UINT32 pitch = bpp;
pitch *= width;
pitch += 31;
pitch /= 32; // quantized to number of 32-bit words.
pitch *= 4; // and then back to bytes, (not just /8 in one step).
return pitch;
}
bool IsAllowedBPCValue(int bpc) {
return bpc == 1 || bpc == 2 || bpc == 4 || bpc == 8 || bpc == 16;
}
bool IsAllowedICCComponents(int nComp) {
return nComp == 1 || nComp == 3 || nComp == 4;
}
template <typename T>
T ClampValue(T value, T max_value) {
value = std::min(value, max_value);
value = std::max<T>(0, value);
return value;
}
// Wrapper class to use with std::unique_ptr for CJPX_Decoder.
class JpxBitMapContext {
public:
explicit JpxBitMapContext(CCodec_JpxModule* jpx_module)
: jpx_module_(jpx_module), decoder_(nullptr) {}
~JpxBitMapContext() {}
void set_decoder(std::unique_ptr<CJPX_Decoder> decoder) {
decoder_ = std::move(decoder);
}
CJPX_Decoder* decoder() { return decoder_.get(); }
private:
CCodec_JpxModule* const jpx_module_; // Weak pointer.
std::unique_ptr<CJPX_Decoder> decoder_;
// Disallow evil constructors
JpxBitMapContext(const JpxBitMapContext&);
void operator=(const JpxBitMapContext&);
};
const int kMaxImageDimension = 0x01FFFF;
} // namespace
CPDF_DIBSource::CPDF_DIBSource()
: m_pDocument(nullptr),
m_pStream(nullptr),
m_pDict(nullptr),
m_pColorSpace(nullptr),
m_Family(0),
m_bpc(0),
m_bpc_orig(0),
m_nComponents(0),
m_GroupFamily(0),
m_MatteColor(0),
m_bLoadMask(false),
m_bDefaultDecode(true),
m_bImageMask(false),
m_bDoBpcCheck(true),
m_bColorKey(false),
m_bHasMask(false),
m_bStdCS(false),
m_pCompData(nullptr),
m_pLineBuf(nullptr),
m_pMaskedLine(nullptr),
m_pMask(nullptr),
m_pMaskStream(nullptr),
m_Status(0) {}
CPDF_DIBSource::~CPDF_DIBSource() {
FX_Free(m_pMaskedLine);
FX_Free(m_pLineBuf);
m_pCachedBitmap.Reset(); // TODO(tsepez): determine if required early here.
FX_Free(m_pCompData);
if (m_pColorSpace && m_pDocument) {
auto* pPageData = m_pDocument->GetPageData();
if (pPageData)
pPageData->ReleaseColorSpace(m_pColorSpace->GetArray());
}
}
bool CPDF_DIBSource::Load(CPDF_Document* pDoc, const CPDF_Stream* pStream) {
if (!pStream)
return false;
m_pDocument = pDoc;
m_pDict = pStream->GetDict();
if (!m_pDict)
return false;
m_pStream = pStream;
m_Width = m_pDict->GetIntegerFor("Width");
m_Height = m_pDict->GetIntegerFor("Height");
if (m_Width <= 0 || m_Height <= 0 || m_Width > kMaxImageDimension ||
m_Height > kMaxImageDimension) {
return false;
}
m_GroupFamily = 0;
m_bLoadMask = false;
if (!LoadColorInfo(nullptr, nullptr))
return false;
if (m_bDoBpcCheck && (m_bpc == 0 || m_nComponents == 0))
return false;
FX_SAFE_UINT32 src_size =
CalculatePitch8(m_bpc, m_nComponents, m_Width) * m_Height;
if (!src_size.IsValid())
return false;
m_pStreamAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pStream);
m_pStreamAcc->LoadAllData(false, src_size.ValueOrDie(), true);
if (m_pStreamAcc->GetSize() == 0 || !m_pStreamAcc->GetData())
return false;
if (!CreateDecoder())
return false;
if (m_bImageMask) {
m_bpp = 1;
m_bpc = 1;
m_nComponents = 1;
m_AlphaFlag = 1;
} else if (m_bpc * m_nComponents == 1) {
m_bpp = 1;
} else if (m_bpc * m_nComponents <= 8) {
m_bpp = 8;
} else {
m_bpp = 24;
}
FX_SAFE_UINT32 pitch = CalculatePitch32(m_bpp, m_Width);
if (!pitch.IsValid())
return false;
m_pLineBuf = FX_Alloc(uint8_t, pitch.ValueOrDie());
LoadPalette();
if (m_bColorKey) {
m_bpp = 32;
m_AlphaFlag = 2;
pitch = CalculatePitch32(m_bpp, m_Width);
if (!pitch.IsValid())
return false;
m_pMaskedLine = FX_Alloc(uint8_t, pitch.ValueOrDie());
}
m_Pitch = pitch.ValueOrDie();
return true;
}
int CPDF_DIBSource::ContinueToLoadMask() {
if (m_bImageMask) {
m_bpp = 1;
m_bpc = 1;
m_nComponents = 1;
m_AlphaFlag = 1;
} else if (m_bpc * m_nComponents == 1) {
m_bpp = 1;
} else if (m_bpc * m_nComponents <= 8) {
m_bpp = 8;
} else {
m_bpp = 24;
}
if (!m_bpc || !m_nComponents) {
return 0;
}
FX_SAFE_UINT32 pitch = CalculatePitch32(m_bpp, m_Width);
if (!pitch.IsValid()) {
return 0;
}
m_pLineBuf = FX_Alloc(uint8_t, pitch.ValueOrDie());
if (m_pColorSpace && m_bStdCS) {
m_pColorSpace->EnableStdConversion(true);
}
LoadPalette();
if (m_bColorKey) {
m_bpp = 32;
m_AlphaFlag = 2;
pitch = CalculatePitch32(m_bpp, m_Width);
if (!pitch.IsValid()) {
return 0;
}
m_pMaskedLine = FX_Alloc(uint8_t, pitch.ValueOrDie());
}
m_Pitch = pitch.ValueOrDie();
return 1;
}
int CPDF_DIBSource::StartLoadDIBSource(CPDF_Document* pDoc,
const CPDF_Stream* pStream,
bool bHasMask,
CPDF_Dictionary* pFormResources,
CPDF_Dictionary* pPageResources,
bool bStdCS,
uint32_t GroupFamily,
bool bLoadMask) {
if (!pStream) {
return 0;
}
m_pDocument = pDoc;
m_pDict = pStream->GetDict();
m_pStream = pStream;
m_bStdCS = bStdCS;
m_bHasMask = bHasMask;
m_Width = m_pDict->GetIntegerFor("Width");
m_Height = m_pDict->GetIntegerFor("Height");
if (m_Width <= 0 || m_Height <= 0 || m_Width > kMaxImageDimension ||
m_Height > kMaxImageDimension) {
return 0;
}
m_GroupFamily = GroupFamily;
m_bLoadMask = bLoadMask;
if (!LoadColorInfo(m_pStream->IsInline() ? pFormResources : nullptr,
pPageResources)) {
return 0;
}
if (m_bDoBpcCheck && (m_bpc == 0 || m_nComponents == 0)) {
return 0;
}
FX_SAFE_UINT32 src_size =
CalculatePitch8(m_bpc, m_nComponents, m_Width) * m_Height;
if (!src_size.IsValid()) {
return 0;
}
m_pStreamAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pStream);
m_pStreamAcc->LoadAllData(false, src_size.ValueOrDie(), true);
if (m_pStreamAcc->GetSize() == 0 || !m_pStreamAcc->GetData()) {
return 0;
}
int ret = CreateDecoder();
if (!ret)
return ret;
if (ret != 1) {
if (!ContinueToLoadMask()) {
return 0;
}
if (m_bHasMask) {
StartLoadMask();
}
return ret;
}
if (!ContinueToLoadMask()) {
return 0;
}
if (m_bHasMask) {
ret = StartLoadMask();
}
if (ret == 2) {
return ret;
}
if (m_pColorSpace && m_bStdCS) {
m_pColorSpace->EnableStdConversion(false);
}
return ret;
}
int CPDF_DIBSource::ContinueLoadDIBSource(IFX_Pause* pPause) {
FXCODEC_STATUS ret;
if (m_Status == 1) {
const CFX_ByteString& decoder = m_pStreamAcc->GetImageDecoder();
if (decoder == "JPXDecode") {
return 0;
}
CCodec_Jbig2Module* pJbig2Module = CPDF_ModuleMgr::Get()->GetJbig2Module();
if (!m_pJbig2Context) {
m_pJbig2Context = pdfium::MakeUnique<CCodec_Jbig2Context>();
if (m_pStreamAcc->GetImageParam()) {
CPDF_Stream* pGlobals =
m_pStreamAcc->GetImageParam()->GetStreamFor("JBIG2Globals");
if (pGlobals) {
m_pGlobalStream = pdfium::MakeRetain<CPDF_StreamAcc>(pGlobals);
m_pGlobalStream->LoadAllData(false);
}
}
ret = pJbig2Module->StartDecode(
m_pJbig2Context.get(), m_pDocument->CodecContext(), m_Width, m_Height,
m_pStreamAcc, m_pGlobalStream, m_pCachedBitmap->GetBuffer(),
m_pCachedBitmap->GetPitch(), pPause);
if (ret < 0) {
m_pCachedBitmap.Reset();
m_pGlobalStream.Reset();
m_pJbig2Context.reset();
return 0;
}
if (ret == FXCODEC_STATUS_DECODE_TOBECONTINUE) {
return 2;
}
int ret1 = 1;
if (m_bHasMask) {
ret1 = ContinueLoadMaskDIB(pPause);
m_Status = 2;
}
if (ret1 == 2) {
return ret1;
}
if (m_pColorSpace && m_bStdCS) {
m_pColorSpace->EnableStdConversion(false);
}
return ret1;
}
ret = pJbig2Module->ContinueDecode(m_pJbig2Context.get(), pPause);
if (ret < 0) {
m_pCachedBitmap.Reset();
m_pGlobalStream.Reset();
m_pJbig2Context.reset();
return 0;
}
if (ret == FXCODEC_STATUS_DECODE_TOBECONTINUE) {
return 2;
}
int ret1 = 1;
if (m_bHasMask) {
ret1 = ContinueLoadMaskDIB(pPause);
m_Status = 2;
}
if (ret1 == 2) {
return ret1;
}
if (m_pColorSpace && m_bStdCS) {
m_pColorSpace->EnableStdConversion(false);
}
return ret1;
}
if (m_Status == 2) {
return ContinueLoadMaskDIB(pPause);
}
return 0;
}
bool CPDF_DIBSource::LoadColorInfo(const CPDF_Dictionary* pFormResources,
const CPDF_Dictionary* pPageResources) {
m_bpc_orig = m_pDict->GetIntegerFor("BitsPerComponent");
if (m_pDict->GetIntegerFor("ImageMask"))
m_bImageMask = true;
if (m_bImageMask || !m_pDict->KeyExist("ColorSpace")) {
if (!m_bImageMask) {
CPDF_Object* pFilter = m_pDict->GetDirectObjectFor("Filter");
if (pFilter) {
CFX_ByteString filter;
if (pFilter->IsName()) {
filter = pFilter->GetString();
} else if (CPDF_Array* pArray = pFilter->AsArray()) {
filter = pArray->GetStringAt(pArray->GetCount() - 1);
}
if (filter == "JPXDecode") {
m_bDoBpcCheck = false;
return true;
}
}
}
m_bImageMask = true;
m_bpc = m_nComponents = 1;
CPDF_Array* pDecode = m_pDict->GetArrayFor("Decode");
m_bDefaultDecode = !pDecode || !pDecode->GetIntegerAt(0);
return true;
}
CPDF_Object* pCSObj = m_pDict->GetDirectObjectFor("ColorSpace");
if (!pCSObj)
return false;
CPDF_DocPageData* pDocPageData = m_pDocument->GetPageData();
if (pFormResources)
m_pColorSpace = pDocPageData->GetColorSpace(pCSObj, pFormResources);
if (!m_pColorSpace)
m_pColorSpace = pDocPageData->GetColorSpace(pCSObj, pPageResources);
if (!m_pColorSpace)
return false;
m_Family = m_pColorSpace->GetFamily();
m_nComponents = m_pColorSpace->CountComponents();
if (m_Family == PDFCS_ICCBASED && pCSObj->IsName()) {
CFX_ByteString cs = pCSObj->GetString();
if (cs == "DeviceGray")
m_nComponents = 1;
else if (cs == "DeviceRGB")
m_nComponents = 3;
else if (cs == "DeviceCMYK")
m_nComponents = 4;
}
ValidateDictParam();
m_pCompData = GetDecodeAndMaskArray(&m_bDefaultDecode, &m_bColorKey);
return !!m_pCompData;
}
DIB_COMP_DATA* CPDF_DIBSource::GetDecodeAndMaskArray(bool* bDefaultDecode,
bool* bColorKey) {
if (!m_pColorSpace)
return nullptr;
DIB_COMP_DATA* const pCompData = FX_Alloc(DIB_COMP_DATA, m_nComponents);
int max_data = (1 << m_bpc) - 1;
CPDF_Array* pDecode = m_pDict->GetArrayFor("Decode");
if (pDecode) {
for (uint32_t i = 0; i < m_nComponents; i++) {
pCompData[i].m_DecodeMin = pDecode->GetNumberAt(i * 2);
float max = pDecode->GetNumberAt(i * 2 + 1);
pCompData[i].m_DecodeStep = (max - pCompData[i].m_DecodeMin) / max_data;
float def_value;
float def_min;
float def_max;
m_pColorSpace->GetDefaultValue(i, &def_value, &def_min, &def_max);
if (m_Family == PDFCS_INDEXED)
def_max = max_data;
if (def_min != pCompData[i].m_DecodeMin || def_max != max)
*bDefaultDecode = false;
}
} else {
for (uint32_t i = 0; i < m_nComponents; i++) {
float def_value;
m_pColorSpace->GetDefaultValue(i, &def_value, &pCompData[i].m_DecodeMin,
&pCompData[i].m_DecodeStep);
if (m_Family == PDFCS_INDEXED)
pCompData[i].m_DecodeStep = max_data;
pCompData[i].m_DecodeStep =
(pCompData[i].m_DecodeStep - pCompData[i].m_DecodeMin) / max_data;
}
}
if (m_pDict->KeyExist("SMask"))
return pCompData;
CPDF_Object* pMask = m_pDict->GetDirectObjectFor("Mask");
if (!pMask)
return pCompData;
if (CPDF_Array* pArray = pMask->AsArray()) {
if (pArray->GetCount() >= m_nComponents * 2) {
for (uint32_t i = 0; i < m_nComponents; i++) {
int min_num = pArray->GetIntegerAt(i * 2);
int max_num = pArray->GetIntegerAt(i * 2 + 1);
pCompData[i].m_ColorKeyMin = std::max(min_num, 0);
pCompData[i].m_ColorKeyMax = std::min(max_num, max_data);
}
}
*bColorKey = true;
}
return pCompData;
}
int CPDF_DIBSource::CreateDecoder() {
const CFX_ByteString& decoder = m_pStreamAcc->GetImageDecoder();
if (decoder.IsEmpty())
return 1;
if (m_bDoBpcCheck && m_bpc == 0)
return 0;
if (decoder == "JPXDecode") {
LoadJpxBitmap();
return m_pCachedBitmap ? 1 : 0;
}
if (decoder == "JBIG2Decode") {
m_pCachedBitmap = pdfium::MakeRetain<CFX_DIBitmap>();
if (!m_pCachedBitmap->Create(
m_Width, m_Height, m_bImageMask ? FXDIB_1bppMask : FXDIB_1bppRgb)) {
m_pCachedBitmap.Reset();
return 0;
}
m_Status = 1;
return 2;
}
const uint8_t* src_data = m_pStreamAcc->GetData();
uint32_t src_size = m_pStreamAcc->GetSize();
const CPDF_Dictionary* pParams = m_pStreamAcc->GetImageParam();
if (decoder == "CCITTFaxDecode") {
m_pDecoder = FPDFAPI_CreateFaxDecoder(src_data, src_size, m_Width, m_Height,
pParams);
} else if (decoder == "FlateDecode") {
m_pDecoder = FPDFAPI_CreateFlateDecoder(
src_data, src_size, m_Width, m_Height, m_nComponents, m_bpc, pParams);
} else if (decoder == "RunLengthDecode") {
CCodec_ModuleMgr* pEncoders = CPDF_ModuleMgr::Get()->GetCodecModule();
m_pDecoder = pEncoders->GetBasicModule()->CreateRunLengthDecoder(
src_data, src_size, m_Width, m_Height, m_nComponents, m_bpc);
} else if (decoder == "DCTDecode") {
if (!CreateDCTDecoder(src_data, src_size, pParams))
return 0;
}
if (!m_pDecoder)
return 0;
FX_SAFE_UINT32 requested_pitch =
CalculatePitch8(m_bpc, m_nComponents, m_Width);
if (!requested_pitch.IsValid())
return 0;
FX_SAFE_UINT32 provided_pitch = CalculatePitch8(
m_pDecoder->GetBPC(), m_pDecoder->CountComps(), m_pDecoder->GetWidth());
if (!provided_pitch.IsValid())
return 0;
if (provided_pitch.ValueOrDie() < requested_pitch.ValueOrDie())
return 0;
return 1;
}
bool CPDF_DIBSource::CreateDCTDecoder(const uint8_t* src_data,
uint32_t src_size,
const CPDF_Dictionary* pParams) {
CCodec_JpegModule* pJpegModule = CPDF_ModuleMgr::Get()->GetJpegModule();
m_pDecoder = pJpegModule->CreateDecoder(
src_data, src_size, m_Width, m_Height, m_nComponents,
!pParams || pParams->GetIntegerFor("ColorTransform", 1));
if (m_pDecoder)
return true;
bool bTransform = false;
int comps;
int bpc;
if (!pJpegModule->LoadInfo(src_data, src_size, &m_Width, &m_Height, &comps,
&bpc, &bTransform)) {
return false;
}
if (m_nComponents == static_cast<uint32_t>(comps)) {
m_bpc = bpc;
m_pDecoder = pJpegModule->CreateDecoder(
src_data, src_size, m_Width, m_Height, m_nComponents, bTransform);
return true;
}
m_nComponents = static_cast<uint32_t>(comps);
FX_Free(m_pCompData);
m_pCompData = nullptr;
if (m_pColorSpace) {
switch (m_Family) {
case PDFCS_DEVICEGRAY:
case PDFCS_DEVICERGB:
case PDFCS_DEVICECMYK: {
uint32_t dwMinComps = ComponentsForFamily(m_Family);
if (m_pColorSpace->CountComponents() < dwMinComps ||
m_nComponents < dwMinComps) {
return false;
}
break;
}
case PDFCS_LAB: {
if (m_nComponents != 3 || m_pColorSpace->CountComponents() < 3)
return false;
break;
}
case PDFCS_ICCBASED: {
if (!IsAllowedICCComponents(m_nComponents) ||
!IsAllowedICCComponents(m_pColorSpace->CountComponents()) ||
m_pColorSpace->CountComponents() < m_nComponents) {
return false;
}
break;
}
default: {
if (m_pColorSpace->CountComponents() != m_nComponents)
return false;
break;
}
}
} else {
if (m_Family == PDFCS_LAB && m_nComponents != 3)
return false;
}
m_pCompData = GetDecodeAndMaskArray(&m_bDefaultDecode, &m_bColorKey);
if (!m_pCompData)
return false;
m_bpc = bpc;
m_pDecoder = pJpegModule->CreateDecoder(src_data, src_size, m_Width, m_Height,
m_nComponents, bTransform);
return true;
}
void CPDF_DIBSource::LoadJpxBitmap() {
CCodec_JpxModule* pJpxModule = CPDF_ModuleMgr::Get()->GetJpxModule();
auto context = pdfium::MakeUnique<JpxBitMapContext>(pJpxModule);
context->set_decoder(pJpxModule->CreateDecoder(
m_pStreamAcc->GetData(), m_pStreamAcc->GetSize(), m_pColorSpace));
if (!context->decoder())
return;
uint32_t width = 0;
uint32_t height = 0;
uint32_t components = 0;
pJpxModule->GetImageInfo(context->decoder(), &width, &height, &components);
if (static_cast<int>(width) < m_Width || static_cast<int>(height) < m_Height)
return;
bool bSwapRGB = false;
if (m_pColorSpace) {
if (components != m_pColorSpace->CountComponents())
return;
if (m_pColorSpace == CPDF_ColorSpace::GetStockCS(PDFCS_DEVICERGB)) {
bSwapRGB = true;
m_pColorSpace = nullptr;
}
} else {
if (components == 3) {
bSwapRGB = true;
} else if (components == 4) {
m_pColorSpace = CPDF_ColorSpace::GetStockCS(PDFCS_DEVICECMYK);
}
m_nComponents = components;
}
FXDIB_Format format;
if (components == 1) {
format = FXDIB_8bppRgb;
} else if (components <= 3) {
format = FXDIB_Rgb;
} else if (components == 4) {
format = FXDIB_Rgb32;
} else {
width = (width * components + 2) / 3;
format = FXDIB_Rgb;
}
m_pCachedBitmap = pdfium::MakeRetain<CFX_DIBitmap>();
if (!m_pCachedBitmap->Create(width, height, format)) {
m_pCachedBitmap.Reset();
return;
}
m_pCachedBitmap->Clear(0xFFFFFFFF);
std::vector<uint8_t> output_offsets(components);
for (uint32_t i = 0; i < components; ++i)
output_offsets[i] = i;
if (bSwapRGB) {
output_offsets[0] = 2;
output_offsets[2] = 0;
}
if (!pJpxModule->Decode(context->decoder(), m_pCachedBitmap->GetBuffer(),
m_pCachedBitmap->GetPitch(), output_offsets)) {
m_pCachedBitmap.Reset();
return;
}
if (m_pColorSpace && m_pColorSpace->GetFamily() == PDFCS_INDEXED &&
m_bpc < 8) {
int scale = 8 - m_bpc;
for (uint32_t row = 0; row < height; ++row) {
uint8_t* scanline =
const_cast<uint8_t*>(m_pCachedBitmap->GetScanline(row));
for (uint32_t col = 0; col < width; ++col) {
*scanline = (*scanline) >> scale;
++scanline;
}
}
}
m_bpc = 8;
}
int CPDF_DIBSource::StartLoadMask() {
m_MatteColor = 0XFFFFFFFF;
m_pMaskStream = m_pDict->GetStreamFor("SMask");
if (m_pMaskStream) {
CPDF_Array* pMatte = m_pMaskStream->GetDict()->GetArrayFor("Matte");
if (pMatte && m_pColorSpace &&
m_pColorSpace->CountComponents() <= m_nComponents) {
float R, G, B;
std::vector<float> colors(m_nComponents);
for (uint32_t i = 0; i < m_nComponents; i++)
colors[i] = pMatte->GetFloatAt(i);
m_pColorSpace->GetRGB(colors.data(), &R, &G, &B);
m_MatteColor = FXARGB_MAKE(0, FXSYS_round(R * 255), FXSYS_round(G * 255),
FXSYS_round(B * 255));
}
return StartLoadMaskDIB();
}
m_pMaskStream = ToStream(m_pDict->GetDirectObjectFor("Mask"));
return m_pMaskStream ? StartLoadMaskDIB() : 1;
}
int CPDF_DIBSource::ContinueLoadMaskDIB(IFX_Pause* pPause) {
if (!m_pMask)
return 1;
int ret = m_pMask->ContinueLoadDIBSource(pPause);
if (ret == 2)
return ret;
if (m_pColorSpace && m_bStdCS)
m_pColorSpace->EnableStdConversion(false);
if (!ret) {
m_pMask.Reset();
return ret;
}
return 1;
}
CFX_RetainPtr<CPDF_DIBSource> CPDF_DIBSource::DetachMask() {
return std::move(m_pMask);
}
int CPDF_DIBSource::StartLoadMaskDIB() {
m_pMask = pdfium::MakeRetain<CPDF_DIBSource>();
int ret = m_pMask->StartLoadDIBSource(m_pDocument.Get(), m_pMaskStream.Get(),
false, nullptr, nullptr, true);
if (ret == 2) {
if (m_Status == 0)
m_Status = 2;
return 2;
}
if (!ret) {
m_pMask.Reset();
return 1;
}
return 1;
}
void CPDF_DIBSource::LoadPalette() {
if (m_bpc == 0) {
return;
}
if (m_bpc * m_nComponents > 8) {
return;
}
if (!m_pColorSpace) {
return;
}
if (m_bpc * m_nComponents == 1) {
if (m_bDefaultDecode &&
(m_Family == PDFCS_DEVICEGRAY || m_Family == PDFCS_DEVICERGB)) {
return;
}
if (m_pColorSpace->CountComponents() > 3) {
return;
}
float color_values[3];
color_values[0] = m_pCompData[0].m_DecodeMin;
color_values[1] = color_values[2] = color_values[0];
float R = 0.0f, G = 0.0f, B = 0.0f;
m_pColorSpace->GetRGB(color_values, &R, &G, &B);
FX_ARGB argb0 = ArgbEncode(255, FXSYS_round(R * 255), FXSYS_round(G * 255),
FXSYS_round(B * 255));
color_values[0] += m_pCompData[0].m_DecodeStep;
color_values[1] += m_pCompData[0].m_DecodeStep;
color_values[2] += m_pCompData[0].m_DecodeStep;
m_pColorSpace->GetRGB(color_values, &R, &G, &B);
FX_ARGB argb1 = ArgbEncode(255, FXSYS_round(R * 255), FXSYS_round(G * 255),
FXSYS_round(B * 255));
if (argb0 != 0xFF000000 || argb1 != 0xFFFFFFFF) {
SetPaletteArgb(0, argb0);
SetPaletteArgb(1, argb1);
}
return;
}
if (m_pColorSpace == CPDF_ColorSpace::GetStockCS(PDFCS_DEVICEGRAY) &&
m_bpc == 8 && m_bDefaultDecode) {
} else {
int palette_count = 1 << (m_bpc * m_nComponents);
CFX_FixedBufGrow<float, 16> color_values(m_nComponents);
float* color_value = color_values;
for (int i = 0; i < palette_count; i++) {
int color_data = i;
for (uint32_t j = 0; j < m_nComponents; j++) {
int encoded_component = color_data % (1 << m_bpc);
color_data /= 1 << m_bpc;
color_value[j] = m_pCompData[j].m_DecodeMin +
m_pCompData[j].m_DecodeStep * encoded_component;
}
float R = 0, G = 0, B = 0;
if (m_nComponents == 1 && m_Family == PDFCS_ICCBASED &&
m_pColorSpace->CountComponents() > 1) {
int nComponents = m_pColorSpace->CountComponents();
std::vector<float> temp_buf(nComponents);
for (int k = 0; k < nComponents; k++) {
temp_buf[k] = *color_value;
}
m_pColorSpace->GetRGB(temp_buf.data(), &R, &G, &B);
} else {
m_pColorSpace->GetRGB(color_value, &R, &G, &B);
}
SetPaletteArgb(i, ArgbEncode(255, FXSYS_round(R * 255),
FXSYS_round(G * 255), FXSYS_round(B * 255)));
}
}
}
void CPDF_DIBSource::ValidateDictParam() {
m_bpc = m_bpc_orig;
CPDF_Object* pFilter = m_pDict->GetDirectObjectFor("Filter");
if (pFilter) {
if (pFilter->IsName()) {
CFX_ByteString filter = pFilter->GetString();
if (filter == "CCITTFaxDecode" || filter == "JBIG2Decode") {
m_bpc = 1;
m_nComponents = 1;
} else if (filter == "RunLengthDecode") {
if (m_bpc != 1) {
m_bpc = 8;
}
} else if (filter == "DCTDecode") {
m_bpc = 8;
}
} else if (CPDF_Array* pArray = pFilter->AsArray()) {
CFX_ByteString filter = pArray->GetStringAt(pArray->GetCount() - 1);
if (filter == "CCITTFaxDecode" || filter == "JBIG2Decode") {
m_bpc = 1;
m_nComponents = 1;
} else if (filter == "DCTDecode") {
// Previously, filter == "RunLengthDecode" was checked in the "if"
// statement as well, but too many documents don't conform to it.
m_bpc = 8;
}
}
}
if (!IsAllowedBPCValue(m_bpc))
m_bpc = 0;
}
void CPDF_DIBSource::TranslateScanline24bpp(uint8_t* dest_scan,
const uint8_t* src_scan) const {
if (m_bpc == 0)
return;
unsigned int max_data = (1 << m_bpc) - 1;
if (m_bDefaultDecode) {
if (m_Family == PDFCS_DEVICERGB || m_Family == PDFCS_CALRGB) {
if (m_nComponents != 3)
return;
const uint8_t* src_pos = src_scan;
switch (m_bpc) {
case 8:
for (int column = 0; column < m_Width; column++) {
*dest_scan++ = src_pos[2];
*dest_scan++ = src_pos[1];
*dest_scan++ = *src_pos;
src_pos += 3;
}
break;
case 16:
for (int col = 0; col < m_Width; col++) {
*dest_scan++ = src_pos[4];
*dest_scan++ = src_pos[2];
*dest_scan++ = *src_pos;
src_pos += 6;
}
break;
default:
uint64_t src_bit_pos = 0;
size_t dest_byte_pos = 0;
for (int column = 0; column < m_Width; column++) {
unsigned int R = GetBits8(src_scan, src_bit_pos, m_bpc);
src_bit_pos += m_bpc;
unsigned int G = GetBits8(src_scan, src_bit_pos, m_bpc);
src_bit_pos += m_bpc;
unsigned int B = GetBits8(src_scan, src_bit_pos, m_bpc);
src_bit_pos += m_bpc;
R = std::min(R, max_data);
G = std::min(G, max_data);
B = std::min(B, max_data);
dest_scan[dest_byte_pos] = B * 255 / max_data;
dest_scan[dest_byte_pos + 1] = G * 255 / max_data;
dest_scan[dest_byte_pos + 2] = R * 255 / max_data;
dest_byte_pos += 3;
}
break;
}
return;
}
if (m_bpc == 8) {
if (m_nComponents == m_pColorSpace->CountComponents())
m_pColorSpace->TranslateImageLine(dest_scan, src_scan, m_Width, m_Width,
m_Height, TransMask());
return;
}
}
CFX_FixedBufGrow<float, 16> color_values1(m_nComponents);
float* color_values = color_values1;
float R = 0.0f;
float G = 0.0f;
float B = 0.0f;
if (m_bpc == 8) {
uint64_t src_byte_pos = 0;
size_t dest_byte_pos = 0;
for (int column = 0; column < m_Width; column++) {
for (uint32_t color = 0; color < m_nComponents; color++) {
uint8_t data = src_scan[src_byte_pos++];
color_values[color] = m_pCompData[color].m_DecodeMin +
m_pCompData[color].m_DecodeStep * data;
}
if (TransMask()) {
float k = 1.0f - color_values[3];
R = (1.0f - color_values[0]) * k;
G = (1.0f - color_values[1]) * k;
B = (1.0f - color_values[2]) * k;
} else {
m_pColorSpace->GetRGB(color_values, &R, &G, &B);
}
R = ClampValue(R, 1.0f);
G = ClampValue(G, 1.0f);
B = ClampValue(B, 1.0f);
dest_scan[dest_byte_pos] = static_cast<uint8_t>(B * 255);
dest_scan[dest_byte_pos + 1] = static_cast<uint8_t>(G * 255);
dest_scan[dest_byte_pos + 2] = static_cast<uint8_t>(R * 255);
dest_byte_pos += 3;
}
} else {
uint64_t src_bit_pos = 0;
size_t dest_byte_pos = 0;
for (int column = 0; column < m_Width; column++) {
for (uint32_t color = 0; color < m_nComponents; color++) {
unsigned int data = GetBits8(src_scan, src_bit_pos, m_bpc);
color_values[color] = m_pCompData[color].m_DecodeMin +
m_pCompData[color].m_DecodeStep * data;
src_bit_pos += m_bpc;
}
if (TransMask()) {
float k = 1.0f - color_values[3];
R = (1.0f - color_values[0]) * k;
G = (1.0f - color_values[1]) * k;
B = (1.0f - color_values[2]) * k;
} else {
m_pColorSpace->GetRGB(color_values, &R, &G, &B);
}
R = ClampValue(R, 1.0f);
G = ClampValue(G, 1.0f);
B = ClampValue(B, 1.0f);
dest_scan[dest_byte_pos] = static_cast<uint8_t>(B * 255);
dest_scan[dest_byte_pos + 1] = static_cast<uint8_t>(G * 255);
dest_scan[dest_byte_pos + 2] = static_cast<uint8_t>(R * 255);
dest_byte_pos += 3;
}
}
}
uint8_t* CPDF_DIBSource::GetBuffer() const {
return m_pCachedBitmap ? m_pCachedBitmap->GetBuffer() : nullptr;
}
const uint8_t* CPDF_DIBSource::GetScanline(int line) const {
if (m_bpc == 0) {
return nullptr;
}
FX_SAFE_UINT32 src_pitch = CalculatePitch8(m_bpc, m_nComponents, m_Width);
if (!src_pitch.IsValid())
return nullptr;
uint32_t src_pitch_value = src_pitch.ValueOrDie();
const uint8_t* pSrcLine = nullptr;
if (m_pCachedBitmap && src_pitch_value <= m_pCachedBitmap->GetPitch()) {
if (line >= m_pCachedBitmap->GetHeight()) {
line = m_pCachedBitmap->GetHeight() - 1;
}
pSrcLine = m_pCachedBitmap->GetScanline(line);
} else if (m_pDecoder) {
pSrcLine = m_pDecoder->GetScanline(line);
} else {
if (m_pStreamAcc->GetSize() >= (line + 1) * src_pitch_value) {
pSrcLine = m_pStreamAcc->GetData() + line * src_pitch_value;
}
}
if (!pSrcLine) {
uint8_t* pLineBuf = m_pMaskedLine ? m_pMaskedLine : m_pLineBuf;
memset(pLineBuf, 0xFF, m_Pitch);
return pLineBuf;
}
if (m_bpc * m_nComponents == 1) {
if (m_bImageMask && m_bDefaultDecode) {
for (uint32_t i = 0; i < src_pitch_value; i++) {
m_pLineBuf[i] = ~pSrcLine[i];
}
} else if (m_bColorKey) {
uint32_t reset_argb, set_argb;
reset_argb = m_pPalette ? m_pPalette.get()[0] : 0xFF000000;
set_argb = m_pPalette ? m_pPalette.get()[1] : 0xFFFFFFFF;
if (m_pCompData[0].m_ColorKeyMin == 0) {
reset_argb = 0;
}
if (m_pCompData[0].m_ColorKeyMax == 1) {
set_argb = 0;
}
set_argb = FXARGB_TODIB(set_argb);
reset_argb = FXARGB_TODIB(reset_argb);
uint32_t* dest_scan = reinterpret_cast<uint32_t*>(m_pMaskedLine);
for (int col = 0; col < m_Width; col++) {
if (pSrcLine[col / 8] & (1 << (7 - col % 8))) {
*dest_scan = set_argb;
} else {
*dest_scan = reset_argb;
}
dest_scan++;
}
return m_pMaskedLine;
} else {
memcpy(m_pLineBuf, pSrcLine, src_pitch_value);
}
return m_pLineBuf;
}
if (m_bpc * m_nComponents <= 8) {
if (m_bpc == 8) {
memcpy(m_pLineBuf, pSrcLine, src_pitch_value);
} else {
uint64_t src_bit_pos = 0;
for (int col = 0; col < m_Width; col++) {
unsigned int color_index = 0;
for (uint32_t color = 0; color < m_nComponents; color++) {
unsigned int data = GetBits8(pSrcLine, src_bit_pos, m_bpc);
color_index |= data << (color * m_bpc);
src_bit_pos += m_bpc;
}
m_pLineBuf[col] = color_index;
}
}
if (!m_bColorKey)
return m_pLineBuf;
uint8_t* pDestPixel = m_pMaskedLine;
const uint8_t* pSrcPixel = m_pLineBuf;
for (int col = 0; col < m_Width; col++) {
uint8_t index = *pSrcPixel++;
if (m_pPalette) {
*pDestPixel++ = FXARGB_B(m_pPalette.get()[index]);
*pDestPixel++ = FXARGB_G(m_pPalette.get()[index]);
*pDestPixel++ = FXARGB_R(m_pPalette.get()[index]);
} else {
*pDestPixel++ = index;
*pDestPixel++ = index;
*pDestPixel++ = index;
}
*pDestPixel = (index < m_pCompData[0].m_ColorKeyMin ||
index > m_pCompData[0].m_ColorKeyMax)
? 0xFF
: 0;
pDestPixel++;
}
return m_pMaskedLine;
}
if (m_bColorKey) {
if (m_nComponents == 3 && m_bpc == 8) {
uint8_t* alpha_channel = m_pMaskedLine + 3;
for (int col = 0; col < m_Width; col++) {
const uint8_t* pPixel = pSrcLine + col * 3;
alpha_channel[col * 4] = (pPixel[0] < m_pCompData[0].m_ColorKeyMin ||
pPixel[0] > m_pCompData[0].m_ColorKeyMax ||
pPixel[1] < m_pCompData[1].m_ColorKeyMin ||
pPixel[1] > m_pCompData[1].m_ColorKeyMax ||
pPixel[2] < m_pCompData[2].m_ColorKeyMin ||
pPixel[2] > m_pCompData[2].m_ColorKeyMax)
? 0xFF
: 0;
}
} else {
memset(m_pMaskedLine, 0xFF, m_Pitch);
}
}
if (m_pColorSpace) {
TranslateScanline24bpp(m_pLineBuf, pSrcLine);
pSrcLine = m_pLineBuf;
}
if (!m_bColorKey)
return pSrcLine;
const uint8_t* pSrcPixel = pSrcLine;
uint8_t* pDestPixel = m_pMaskedLine;
for (int col = 0; col < m_Width; col++) {
*pDestPixel++ = *pSrcPixel++;
*pDestPixel++ = *pSrcPixel++;
*pDestPixel++ = *pSrcPixel++;
pDestPixel++;
}
return m_pMaskedLine;
}
bool CPDF_DIBSource::SkipToScanline(int line, IFX_Pause* pPause) const {
return m_pDecoder && m_pDecoder->SkipToScanline(line, pPause);
}
void CPDF_DIBSource::DownSampleScanline(int line,
uint8_t* dest_scan,
int dest_bpp,
int dest_width,
bool bFlipX,
int clip_left,
int clip_width) const {
if (line < 0 || !dest_scan || dest_bpp <= 0 || dest_width <= 0 ||
clip_left < 0 || clip_width <= 0) {
return;
}
uint32_t src_width = m_Width;
FX_SAFE_UINT32 pitch = CalculatePitch8(m_bpc, m_nComponents, m_Width);
if (!pitch.IsValid())
return;
const uint8_t* pSrcLine = nullptr;
if (m_pCachedBitmap) {
pSrcLine = m_pCachedBitmap->GetScanline(line);
} else if (m_pDecoder) {
pSrcLine = m_pDecoder->GetScanline(line);
} else {
uint32_t src_pitch = pitch.ValueOrDie();
pitch *= (line + 1);
if (!pitch.IsValid()) {
return;
}
if (m_pStreamAcc->GetSize() >= pitch.ValueOrDie()) {
pSrcLine = m_pStreamAcc->GetData() + line * src_pitch;
}
}
int orig_Bpp = m_bpc * m_nComponents / 8;
int dest_Bpp = dest_bpp / 8;
if (!pSrcLine) {
memset(dest_scan, 0xFF, dest_Bpp * clip_width);
return;
}
FX_SAFE_INT32 max_src_x = clip_left;
max_src_x += clip_width - 1;
max_src_x *= src_width;
max_src_x /= dest_width;
if (!max_src_x.IsValid())
return;
if (m_bpc * m_nComponents == 1) {
DownSampleScanline1Bit(orig_Bpp, dest_Bpp, src_width, pSrcLine, dest_scan,
dest_width, bFlipX, clip_left, clip_width);
} else if (m_bpc * m_nComponents <= 8) {
DownSampleScanline8Bit(orig_Bpp, dest_Bpp, src_width, pSrcLine, dest_scan,
dest_width, bFlipX, clip_left, clip_width);
} else {
DownSampleScanline32Bit(orig_Bpp, dest_Bpp, src_width, pSrcLine, dest_scan,
dest_width, bFlipX, clip_left, clip_width);
}
}
void CPDF_DIBSource::DownSampleScanline1Bit(int orig_Bpp,
int dest_Bpp,
uint32_t src_width,
const uint8_t* pSrcLine,
uint8_t* dest_scan,
int dest_width,
bool bFlipX,
int clip_left,
int clip_width) const {
uint32_t set_argb = 0xFFFFFFFF;
uint32_t reset_argb = 0;
if (m_bImageMask) {
if (m_bDefaultDecode) {
set_argb = 0;
reset_argb = 0xFFFFFFFF;
}
} else if (m_bColorKey) {
reset_argb = m_pPalette ? m_pPalette.get()[0] : 0xFF000000;
set_argb = m_pPalette ? m_pPalette.get()[1] : 0xFFFFFFFF;
if (m_pCompData[0].m_ColorKeyMin == 0) {
reset_argb = 0;
}
if (m_pCompData[0].m_ColorKeyMax == 1) {
set_argb = 0;
}
set_argb = FXARGB_TODIB(set_argb);
reset_argb = FXARGB_TODIB(reset_argb);
uint32_t* dest_scan_dword = reinterpret_cast<uint32_t*>(dest_scan);
for (int i = 0; i < clip_width; i++) {
uint32_t src_x = (clip_left + i) * src_width / dest_width;
if (bFlipX) {
src_x = src_width - src_x - 1;
}
src_x %= src_width;
if (pSrcLine[src_x / 8] & (1 << (7 - src_x % 8))) {
dest_scan_dword[i] = set_argb;
} else {
dest_scan_dword[i] = reset_argb;
}
}
return;
} else {
if (dest_Bpp == 1) {
} else if (m_pPalette) {
reset_argb = m_pPalette.get()[0];
set_argb = m_pPalette.get()[1];
}
}
for (int i = 0; i < clip_width; i++) {
uint32_t src_x = (clip_left + i) * src_width / dest_width;
if (bFlipX) {
src_x = src_width - src_x - 1;
}
src_x %= src_width;
int dest_pos = i * dest_Bpp;
if (pSrcLine[src_x / 8] & (1 << (7 - src_x % 8))) {
if (dest_Bpp == 1) {
dest_scan[dest_pos] = static_cast<uint8_t>(set_argb);
} else if (dest_Bpp == 3) {
dest_scan[dest_pos] = FXARGB_B(set_argb);
dest_scan[dest_pos + 1] = FXARGB_G(set_argb);
dest_scan[dest_pos + 2] = FXARGB_R(set_argb);
} else {
*reinterpret_cast<uint32_t*>(dest_scan + dest_pos) = set_argb;
}
} else {
if (dest_Bpp == 1) {
dest_scan[dest_pos] = static_cast<uint8_t>(reset_argb);
} else if (dest_Bpp == 3) {
dest_scan[dest_pos] = FXARGB_B(reset_argb);
dest_scan[dest_pos + 1] = FXARGB_G(reset_argb);
dest_scan[dest_pos + 2] = FXARGB_R(reset_argb);
} else {
*reinterpret_cast<uint32_t*>(dest_scan + dest_pos) = reset_argb;
}
}
}
}
void CPDF_DIBSource::DownSampleScanline8Bit(int orig_Bpp,
int dest_Bpp,
uint32_t src_width,
const uint8_t* pSrcLine,
uint8_t* dest_scan,
int dest_width,
bool bFlipX,
int clip_left,
int clip_width) const {
if (m_bpc < 8) {
uint64_t src_bit_pos = 0;
for (uint32_t col = 0; col < src_width; col++) {
unsigned int color_index = 0;
for (uint32_t color = 0; color < m_nComponents; color++) {
unsigned int data = GetBits8(pSrcLine, src_bit_pos, m_bpc);
color_index |= data << (color * m_bpc);
src_bit_pos += m_bpc;
}
m_pLineBuf[col] = color_index;
}
pSrcLine = m_pLineBuf;
}
if (m_bColorKey) {
for (int i = 0; i < clip_width; i++) {
uint32_t src_x = (clip_left + i) * src_width / dest_width;
if (bFlipX) {
src_x = src_width - src_x - 1;
}
src_x %= src_width;
uint8_t* pDestPixel = dest_scan + i * 4;
uint8_t index = pSrcLine[src_x];
if (m_pPalette) {
*pDestPixel++ = FXARGB_B(m_pPalette.get()[index]);
*pDestPixel++ = FXARGB_G(m_pPalette.get()[index]);
*pDestPixel++ = FXARGB_R(m_pPalette.get()[index]);
} else {
*pDestPixel++ = index;
*pDestPixel++ = index;
*pDestPixel++ = index;
}
*pDestPixel = (index < m_pCompData[0].m_ColorKeyMin ||
index > m_pCompData[0].m_ColorKeyMax)
? 0xFF
: 0;
}
return;
}
for (int i = 0; i < clip_width; i++) {
uint32_t src_x = (clip_left + i) * src_width / dest_width;
if (bFlipX) {
src_x = src_width - src_x - 1;
}
src_x %= src_width;
uint8_t index = pSrcLine[src_x];
if (dest_Bpp == 1) {
dest_scan[i] = index;
} else {
int dest_pos = i * dest_Bpp;
FX_ARGB argb = m_pPalette.get()[index];
dest_scan[dest_pos] = FXARGB_B(argb);
dest_scan[dest_pos + 1] = FXARGB_G(argb);
dest_scan[dest_pos + 2] = FXARGB_R(argb);
}
}
}
void CPDF_DIBSource::DownSampleScanline32Bit(int orig_Bpp,
int dest_Bpp,
uint32_t src_width,
const uint8_t* pSrcLine,
uint8_t* dest_scan,
int dest_width,
bool bFlipX,
int clip_left,
int clip_width) const {
// last_src_x used to store the last seen src_x position which should be
// in [0, src_width). Set the initial value to be an invalid src_x value.
uint32_t last_src_x = src_width;
FX_ARGB last_argb = FXARGB_MAKE(0xFF, 0xFF, 0xFF, 0xFF);
float unit_To8Bpc = 255.0f / ((1 << m_bpc) - 1);
for (int i = 0; i < clip_width; i++) {
int dest_x = clip_left + i;
uint32_t src_x = (bFlipX ? (dest_width - dest_x - 1) : dest_x) *
(int64_t)src_width / dest_width;
src_x %= src_width;
uint8_t* pDestPixel = dest_scan + i * dest_Bpp;
FX_ARGB argb;
if (src_x == last_src_x) {
argb = last_argb;
} else {
CFX_FixedBufGrow<uint8_t, 16> extracted_components(m_nComponents);
const uint8_t* pSrcPixel = nullptr;
if (m_bpc % 8 != 0) {
// No need to check for 32-bit overflow, as |src_x| is bounded by
// |src_width| and DownSampleScanline() already checked for overflow
// with the pitch calculation.
size_t num_bits = src_x * m_bpc * m_nComponents;
uint64_t src_bit_pos = num_bits % 8;
pSrcPixel = pSrcLine + num_bits / 8;
for (uint32_t j = 0; j < m_nComponents; ++j) {
extracted_components[j] = static_cast<uint8_t>(
GetBits8(pSrcPixel, src_bit_pos, m_bpc) * unit_To8Bpc);
src_bit_pos += m_bpc;
}
pSrcPixel = extracted_components;
} else {
pSrcPixel = pSrcLine + src_x * orig_Bpp;
if (m_bpc == 16) {
for (uint32_t j = 0; j < m_nComponents; ++j)
extracted_components[j] = pSrcPixel[j * 2];
pSrcPixel = extracted_components;
}
}
if (m_pColorSpace) {
uint8_t color[4];
const bool bTransMask = TransMask();
if (!m_bDefaultDecode) {
for (uint32_t j = 0; j < m_nComponents; ++j) {
float component_value = static_cast<float>(pSrcPixel[j]);
int color_value = static_cast<int>(
(m_pCompData[j].m_DecodeMin +
m_pCompData[j].m_DecodeStep * component_value) *
255.0f +
0.5f);
extracted_components[j] = pdfium::clamp(color_value, 0, 255);
}
}
const uint8_t* pSrc =
m_bDefaultDecode ? pSrcPixel : extracted_components;
m_pColorSpace->TranslateImageLine(color, pSrc, 1, 0, 0, bTransMask);
argb = FXARGB_MAKE(0xFF, color[2], color[1], color[0]);
} else {
argb = FXARGB_MAKE(0xFF, pSrcPixel[2], pSrcPixel[1], pSrcPixel[0]);
}
if (m_bColorKey) {
int alpha = 0xFF;
if (m_nComponents == 3 && m_bpc == 8) {
alpha = (pSrcPixel[0] < m_pCompData[0].m_ColorKeyMin ||
pSrcPixel[0] > m_pCompData[0].m_ColorKeyMax ||
pSrcPixel[1] < m_pCompData[1].m_ColorKeyMin ||
pSrcPixel[1] > m_pCompData[1].m_ColorKeyMax ||
pSrcPixel[2] < m_pCompData[2].m_ColorKeyMin ||
pSrcPixel[2] > m_pCompData[2].m_ColorKeyMax)
? 0xFF
: 0;
}
argb &= 0xFFFFFF;
argb |= alpha << 24;
}
last_src_x = src_x;
last_argb = argb;
}
if (dest_Bpp == 4) {
*reinterpret_cast<uint32_t*>(pDestPixel) = FXARGB_TODIB(argb);
} else {
*pDestPixel++ = FXARGB_B(argb);
*pDestPixel++ = FXARGB_G(argb);
*pDestPixel = FXARGB_R(argb);
}
}
}
bool CPDF_DIBSource::TransMask() const {
return m_bLoadMask && m_GroupFamily == PDFCS_DEVICECMYK &&
m_Family == PDFCS_DEVICECMYK;
}