diff options
Diffstat (limited to 'core/fpdfapi/render/cpdf_dibsource.cpp')
| -rw-r--r-- | core/fpdfapi/render/cpdf_dibsource.cpp | 1480 |
1 files changed, 1480 insertions, 0 deletions
diff --git a/core/fpdfapi/render/cpdf_dibsource.cpp b/core/fpdfapi/render/cpdf_dibsource.cpp new file mode 100644 index 0000000000..c84adfe1ec --- /dev/null +++ b/core/fpdfapi/render/cpdf_dibsource.cpp @@ -0,0 +1,1480 @@ +// 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 <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/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() { jpx_module_->DestroyDecoder(decoder_); } + + // Takes ownership of |decoder|. + void set_decoder(CJPX_Decoder* decoder) { decoder_ = decoder; } + + CJPX_Decoder* decoder() { return decoder_; } + + private: + CCodec_JpxModule* const jpx_module_; // Weak pointer. + CJPX_Decoder* decoder_; // Decoder, owned. + + // 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(); + FX_Free(m_pCompData); + CPDF_ColorSpace* pCS = m_pColorSpace; + if (pCS && m_pDocument) { + m_pDocument->GetPageData()->ReleaseColorSpace(pCS->GetArray()); + } +} + +bool CPDF_DIBSource::Load(CPDF_Document* pDoc, + const CPDF_Stream* pStream, + CPDF_DIBSource** ppMask, + uint32_t* pMatteColor, + CPDF_Dictionary* pFormResources, + CPDF_Dictionary* pPageResources, + bool bStdCS, + uint32_t GroupFamily, + bool bLoadMask) { + 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 = GroupFamily; + m_bLoadMask = bLoadMask; + if (!LoadColorInfo(m_pStream->IsInline() ? pFormResources : nullptr, + pPageResources)) { + 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::MakeUnique<CPDF_StreamAcc>(); + m_pStreamAcc->LoadAllData(pStream, 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()); + if (m_pColorSpace && 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 false; + } + m_pMaskedLine = FX_Alloc(uint8_t, pitch.ValueOrDie()); + } + m_Pitch = pitch.ValueOrDie(); + if (ppMask) { + *ppMask = LoadMask(*pMatteColor); + } + if (m_pColorSpace && bStdCS) { + m_pColorSpace->EnableStdConversion(false); + } + 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::MakeUnique<CPDF_StreamAcc>(); + m_pStreamAcc->LoadAllData(pStream, 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) { + StratLoadMask(); + } + return ret; + } + if (!ContinueToLoadMask()) { + return 0; + } + if (m_bHasMask) { + ret = StratLoadMask(); + } + 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::MakeUnique<CPDF_StreamAcc>(); + m_pGlobalStream->LoadAllData(pGlobals, false); + } + } + ret = pJbig2Module->StartDecode( + m_pJbig2Context.get(), m_pDocument->CodecContext(), m_Width, m_Height, + m_pStreamAcc.get(), m_pGlobalStream.get(), + 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* 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); + FX_FLOAT max = pDecode->GetNumberAt(i * 2 + 1); + pCompData[i].m_DecodeStep = (max - pCompData[i].m_DecodeMin) / max_data; + FX_FLOAT def_value; + FX_FLOAT def_min; + FX_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++) { + FX_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")) { + 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::MakeUnique<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") { + m_pDecoder = CPDF_ModuleMgr::Get() + ->GetCodecModule() + ->GetBasicModule() + ->CreateRunLengthDecoder(src_data, src_size, m_Width, + m_Height, m_nComponents, m_bpc); + } else if (decoder == "DCTDecode") { + m_pDecoder = CPDF_ModuleMgr::Get()->GetJpegModule()->CreateDecoder( + src_data, src_size, m_Width, m_Height, m_nComponents, + !pParams || pParams->GetIntegerFor("ColorTransform", 1)); + if (!m_pDecoder) { + bool bTransform = false; + int comps; + int bpc; + CCodec_JpegModule* pJpegModule = CPDF_ModuleMgr::Get()->GetJpegModule(); + if (pJpegModule->LoadInfo(src_data, src_size, &m_Width, &m_Height, &comps, + &bpc, &bTransform)) { + if (m_nComponents != static_cast<uint32_t>(comps)) { + FX_Free(m_pCompData); + m_pCompData = nullptr; + m_nComponents = static_cast<uint32_t>(comps); + 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 0; + } + break; + } + case PDFCS_LAB: { + if (m_nComponents != 3 || m_pColorSpace->CountComponents() < 3) + return 0; + break; + } + case PDFCS_ICCBASED: { + if (!IsAllowedICCComponents(m_nComponents) || + !IsAllowedICCComponents(m_pColorSpace->CountComponents()) || + m_pColorSpace->CountComponents() < m_nComponents) { + return 0; + } + break; + } + default: { + if (m_pColorSpace->CountComponents() != m_nComponents) + return 0; + break; + } + } + } else { + if (m_Family == PDFCS_LAB && m_nComponents != 3) + return 0; + } + m_pCompData = GetDecodeAndMaskArray(m_bDefaultDecode, m_bColorKey); + if (!m_pCompData) + return 0; + } + m_bpc = bpc; + m_pDecoder = CPDF_ModuleMgr::Get()->GetJpegModule()->CreateDecoder( + src_data, src_size, m_Width, m_Height, m_nComponents, bTransform); + } + } + } + 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; +} + +void CPDF_DIBSource::LoadJpxBitmap() { + CCodec_JpxModule* pJpxModule = CPDF_ModuleMgr::Get()->GetJpxModule(); + if (!pJpxModule) + return; + + std::unique_ptr<JpxBitMapContext> context(new 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::MakeUnique<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; +} + +CPDF_DIBSource* CPDF_DIBSource::LoadMask(uint32_t& MatteColor) { + MatteColor = 0xFFFFFFFF; + CPDF_Stream* pSoftMask = m_pDict->GetStreamFor("SMask"); + if (pSoftMask) { + CPDF_Array* pMatte = pSoftMask->GetDict()->GetArrayFor("Matte"); + if (pMatte && m_pColorSpace && + m_pColorSpace->CountComponents() <= m_nComponents) { + std::vector<FX_FLOAT> colors(m_nComponents); + for (uint32_t i = 0; i < m_nComponents; i++) { + colors[i] = pMatte->GetFloatAt(i); + } + FX_FLOAT R, G, B; + m_pColorSpace->GetRGB(colors.data(), R, G, B); + MatteColor = FXARGB_MAKE(0, FXSYS_round(R * 255), FXSYS_round(G * 255), + FXSYS_round(B * 255)); + } + return LoadMaskDIB(pSoftMask); + } + + if (CPDF_Stream* pStream = ToStream(m_pDict->GetDirectObjectFor("Mask"))) + return LoadMaskDIB(pStream); + + return nullptr; +} + +int CPDF_DIBSource::StratLoadMask() { + 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) { + FX_FLOAT R, G, B; + std::vector<FX_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) { + delete m_pMask; + m_pMask = nullptr; + return ret; + } + return 1; +} + +CPDF_DIBSource* CPDF_DIBSource::DetachMask() { + CPDF_DIBSource* pDIBSource = m_pMask; + m_pMask = nullptr; + return pDIBSource; +} + +CPDF_DIBSource* CPDF_DIBSource::LoadMaskDIB(CPDF_Stream* pMask) { + CPDF_DIBSource* pMaskSource = new CPDF_DIBSource; + if (!pMaskSource->Load(m_pDocument, pMask, nullptr, nullptr, nullptr, nullptr, + true)) { + delete pMaskSource; + return nullptr; + } + return pMaskSource; +} + +int CPDF_DIBSource::StartLoadMaskDIB() { + m_pMask = new CPDF_DIBSource; + int ret = m_pMask->StartLoadDIBSource(m_pDocument, m_pMaskStream, false, + nullptr, nullptr, true); + if (ret == 2) { + if (m_Status == 0) + m_Status = 2; + return 2; + } + if (!ret) { + delete m_pMask; + m_pMask = nullptr; + 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; + } + FX_FLOAT color_values[3]; + color_values[0] = m_pCompData[0].m_DecodeMin; + color_values[1] = color_values[2] = color_values[0]; + FX_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<FX_FLOAT, 16> color_values(m_nComponents); + FX_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; + } + FX_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<FX_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 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; + 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; + 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<FX_FLOAT, 16> color_values1(m_nComponents); + FX_FLOAT* color_values = color_values1; + FX_FLOAT R = 0.0f, G = 0.0f, 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()) { + FX_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()) { + FX_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; + FXSYS_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 { + FXSYS_memcpy(m_pLineBuf, pSrcLine, src_pitch_value); + } + return m_pLineBuf; + } + if (m_bpc * m_nComponents <= 8) { + if (m_bpc == 8) { + FXSYS_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) { + 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; + } + return m_pLineBuf; + } + 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 { + FXSYS_memset(m_pMaskedLine, 0xFF, m_Pitch); + } + } + if (m_pColorSpace) { + TranslateScanline24bpp(m_pLineBuf, pSrcLine); + pSrcLine = m_pLineBuf; + } + if (m_bColorKey) { + 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; + } + return pSrcLine; +} + +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) { + FXSYS_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 = (uint32_t)-1; + uint32_t reset_argb = 0; + if (m_bImageMask) { + if (m_bDefaultDecode) { + set_argb = 0; + reset_argb = (uint32_t)-1; + } + } 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); + FX_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, 128> 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) { + m_pColorSpace->TranslateImageLine(color, pSrcPixel, 1, 0, 0, + bTransMask); + } else { + for (uint32_t j = 0; j < m_nComponents; ++j) { + FX_FLOAT component_value = + static_cast<FX_FLOAT>(extracted_components[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] = + color_value > 255 ? 255 : (color_value < 0 ? 0 : color_value); + } + m_pColorSpace->TranslateImageLine(color, extracted_components, 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; +} |