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-rw-r--r--core/fpdfapi/render/cpdf_dibbase.cpp1349
1 files changed, 1349 insertions, 0 deletions
diff --git a/core/fpdfapi/render/cpdf_dibbase.cpp b/core/fpdfapi/render/cpdf_dibbase.cpp
new file mode 100644
index 0000000000..9aa1ab40a6
--- /dev/null
+++ b/core/fpdfapi/render/cpdf_dibbase.cpp
@@ -0,0 +1,1349 @@
+// 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_dibbase.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/ccodec_basicmodule.h"
+#include "core/fxcodec/codec/ccodec_jbig2module.h"
+#include "core/fxcodec/codec/ccodec_jpegmodule.h"
+#include "core/fxcodec/codec/ccodec_jpxmodule.h"
+#include "core/fxcodec/codec/ccodec_scanlinedecoder.h"
+#include "core/fxcodec/codec/cjpx_decoder.h"
+#include "core/fxcodec/fx_codec.h"
+#include "core/fxcrt/cfx_fixedbufgrow.h"
+#include "core/fxcrt/fx_safe_types.h"
+#include "core/fxge/dib/cfx_dibitmap.h"
+#include "third_party/base/ptr_util.h"
+
+namespace {
+
+constexpr int kMaxImageDimension = 0x01FFFF;
+
+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);
+}
+
+bool GetBitValue(const uint8_t* pSrc, uint32_t pos) {
+ return pSrc[pos / 8] & (1 << (7 - pos % 8));
+}
+
+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;
+}
+
+bool IsColorIndexOutOfBounds(uint8_t index, const DIB_COMP_DATA& comp_datum) {
+ return index < comp_datum.m_ColorKeyMin || index > comp_datum.m_ColorKeyMax;
+}
+
+bool AreColorIndicesOutOfBounds(const uint8_t* indices,
+ const DIB_COMP_DATA* comp_data,
+ size_t count) {
+ for (size_t i = 0; i < count; ++i) {
+ if (IsColorIndexOutOfBounds(indices[i], comp_data[i]))
+ return true;
+ }
+ return false;
+}
+
+// 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&);
+};
+
+} // namespace
+
+CPDF_DIBBase::CPDF_DIBBase() {}
+
+CPDF_DIBBase::~CPDF_DIBBase() {
+ if (m_pColorSpace && m_pDocument) {
+ auto* pPageData = m_pDocument->GetPageData();
+ if (pPageData) {
+ auto* pSpace = m_pColorSpace.Release();
+ pPageData->ReleaseColorSpace(pSpace->GetArray());
+ }
+ }
+}
+
+bool CPDF_DIBBase::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() == LoadState::kFail)
+ 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.reset(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.reset(FX_Alloc(uint8_t, pitch.ValueOrDie()));
+ }
+ m_Pitch = pitch.ValueOrDie();
+ return true;
+}
+
+bool CPDF_DIBBase::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 false;
+ }
+ FX_SAFE_UINT32 pitch = CalculatePitch32(m_bpp, m_Width);
+ if (!pitch.IsValid())
+ return false;
+
+ m_pLineBuf.reset(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 false;
+ m_pMaskedLine.reset(FX_Alloc(uint8_t, pitch.ValueOrDie()));
+ }
+ m_Pitch = pitch.ValueOrDie();
+ return true;
+}
+
+CPDF_DIBBase::LoadState CPDF_DIBBase::StartLoadDIBBase(
+ CPDF_Document* pDoc,
+ const CPDF_Stream* pStream,
+ bool bHasMask,
+ const CPDF_Dictionary* pFormResources,
+ CPDF_Dictionary* pPageResources,
+ bool bStdCS,
+ uint32_t GroupFamily,
+ bool bLoadMask) {
+ if (!pStream)
+ return LoadState::kFail;
+
+ 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 LoadState::kFail;
+ }
+ m_GroupFamily = GroupFamily;
+ m_bLoadMask = bLoadMask;
+ if (!LoadColorInfo(m_pStream->IsInline() ? pFormResources : nullptr,
+ pPageResources)) {
+ return LoadState::kFail;
+ }
+ if (m_bDoBpcCheck && (m_bpc == 0 || m_nComponents == 0))
+ return LoadState::kFail;
+
+ FX_SAFE_UINT32 src_size =
+ CalculatePitch8(m_bpc, m_nComponents, m_Width) * m_Height;
+ if (!src_size.IsValid())
+ return LoadState::kFail;
+
+ m_pStreamAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pStream);
+ m_pStreamAcc->LoadAllData(false, src_size.ValueOrDie(), true);
+ if (m_pStreamAcc->GetSize() == 0 || !m_pStreamAcc->GetData())
+ return LoadState::kFail;
+
+ LoadState iCreatedDecoder = CreateDecoder();
+ if (iCreatedDecoder == LoadState::kFail)
+ return LoadState::kFail;
+
+ if (!ContinueToLoadMask())
+ return LoadState::kFail;
+
+ LoadState iLoadedMask = m_bHasMask ? StartLoadMask() : LoadState::kSuccess;
+ if (iCreatedDecoder == LoadState::kContinue ||
+ iLoadedMask == LoadState::kContinue) {
+ return LoadState::kContinue;
+ }
+
+ ASSERT(iCreatedDecoder == LoadState::kSuccess);
+ ASSERT(iLoadedMask == LoadState::kSuccess);
+ if (m_pColorSpace && m_bStdCS)
+ m_pColorSpace->EnableStdConversion(false);
+ return LoadState::kSuccess;
+}
+
+CPDF_DIBBase::LoadState CPDF_DIBBase::ContinueLoadDIBBase(
+ PauseIndicatorIface* pPause) {
+ if (m_Status == LoadState::kContinue)
+ return ContinueLoadMaskDIB(pPause);
+
+ if (m_Status == LoadState::kFail)
+ return LoadState::kFail;
+
+ if (m_pStreamAcc->GetImageDecoder() == "JPXDecode")
+ return LoadState::kFail;
+
+ FXCODEC_STATUS iDecodeStatus;
+ CCodec_Jbig2Module* pJbig2Module = CPDF_ModuleMgr::Get()->GetJbig2Module();
+ if (!m_pJbig2Context) {
+ m_pJbig2Context = pdfium::MakeUnique<CCodec_Jbig2Context>();
+ if (m_pStreamAcc->GetImageParam()) {
+ const CPDF_Stream* pGlobals =
+ m_pStreamAcc->GetImageParam()->GetStreamFor("JBIG2Globals");
+ if (pGlobals) {
+ m_pGlobalStream = pdfium::MakeRetain<CPDF_StreamAcc>(pGlobals);
+ m_pGlobalStream->LoadAllDataFiltered();
+ }
+ }
+ iDecodeStatus = pJbig2Module->StartDecode(
+ m_pJbig2Context.get(), m_pDocument->CodecContext(), m_Width, m_Height,
+ m_pStreamAcc, m_pGlobalStream, m_pCachedBitmap->GetBuffer(),
+ m_pCachedBitmap->GetPitch(), pPause);
+ } else {
+ iDecodeStatus = pJbig2Module->ContinueDecode(m_pJbig2Context.get(), pPause);
+ }
+
+ if (iDecodeStatus < 0) {
+ m_pJbig2Context.reset();
+ m_pCachedBitmap.Reset();
+ m_pGlobalStream.Reset();
+ return LoadState::kFail;
+ }
+ if (iDecodeStatus == FXCODEC_STATUS_DECODE_TOBECONTINUE)
+ return LoadState::kContinue;
+
+ LoadState iContinueStatus = LoadState::kSuccess;
+ if (m_bHasMask) {
+ if (ContinueLoadMaskDIB(pPause) == LoadState::kContinue) {
+ iContinueStatus = LoadState::kContinue;
+ m_Status = LoadState::kContinue;
+ }
+ }
+ if (iContinueStatus == LoadState::kContinue)
+ return LoadState::kContinue;
+
+ if (m_pColorSpace && m_bStdCS)
+ m_pColorSpace->EnableStdConversion(false);
+ return iContinueStatus;
+}
+
+bool CPDF_DIBBase::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) {
+ const CPDF_Object* pFilter = m_pDict->GetDirectObjectFor("Filter");
+ if (pFilter) {
+ ByteString filter;
+ if (pFilter->IsName()) {
+ filter = pFilter->GetString();
+ } else if (const 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;
+ const CPDF_Array* pDecode = m_pDict->GetArrayFor("Decode");
+ m_bDefaultDecode = !pDecode || !pDecode->GetIntegerAt(0);
+ return true;
+ }
+
+ const 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()) {
+ 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();
+ return GetDecodeAndMaskArray(&m_bDefaultDecode, &m_bColorKey);
+}
+
+bool CPDF_DIBBase::GetDecodeAndMaskArray(bool* bDefaultDecode,
+ bool* bColorKey) {
+ if (!m_pColorSpace)
+ return false;
+
+ m_CompData.resize(m_nComponents);
+ int max_data = (1 << m_bpc) - 1;
+ const CPDF_Array* pDecode = m_pDict->GetArrayFor("Decode");
+ if (pDecode) {
+ for (uint32_t i = 0; i < m_nComponents; i++) {
+ m_CompData[i].m_DecodeMin = pDecode->GetNumberAt(i * 2);
+ float max = pDecode->GetNumberAt(i * 2 + 1);
+ m_CompData[i].m_DecodeStep = (max - m_CompData[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 != m_CompData[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, &m_CompData[i].m_DecodeMin,
+ &m_CompData[i].m_DecodeStep);
+ if (m_Family == PDFCS_INDEXED)
+ m_CompData[i].m_DecodeStep = max_data;
+ m_CompData[i].m_DecodeStep =
+ (m_CompData[i].m_DecodeStep - m_CompData[i].m_DecodeMin) / max_data;
+ }
+ }
+ if (m_pDict->KeyExist("SMask"))
+ return true;
+
+ const CPDF_Object* pMask = m_pDict->GetDirectObjectFor("Mask");
+ if (!pMask)
+ return true;
+
+ if (const 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);
+ m_CompData[i].m_ColorKeyMin = std::max(min_num, 0);
+ m_CompData[i].m_ColorKeyMax = std::min(max_num, max_data);
+ }
+ }
+ *bColorKey = true;
+ }
+ return true;
+}
+
+CPDF_DIBBase::LoadState CPDF_DIBBase::CreateDecoder() {
+ ByteString decoder = m_pStreamAcc->GetImageDecoder();
+ if (decoder.IsEmpty())
+ return LoadState::kSuccess;
+
+ if (m_bDoBpcCheck && m_bpc == 0)
+ return LoadState::kFail;
+
+ if (decoder == "JPXDecode") {
+ m_pCachedBitmap = LoadJpxBitmap();
+ return m_pCachedBitmap ? LoadState::kSuccess : LoadState::kFail;
+ }
+
+ 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 LoadState::kFail;
+ }
+ m_Status = LoadState::kSuccess;
+ return LoadState::kContinue;
+ }
+
+ 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 LoadState::kFail;
+ }
+ if (!m_pDecoder)
+ return LoadState::kFail;
+
+ FX_SAFE_UINT32 requested_pitch =
+ CalculatePitch8(m_bpc, m_nComponents, m_Width);
+ if (!requested_pitch.IsValid())
+ return LoadState::kFail;
+ FX_SAFE_UINT32 provided_pitch = CalculatePitch8(
+ m_pDecoder->GetBPC(), m_pDecoder->CountComps(), m_pDecoder->GetWidth());
+ if (!provided_pitch.IsValid())
+ return LoadState::kFail;
+ if (provided_pitch.ValueOrDie() < requested_pitch.ValueOrDie())
+ return LoadState::kFail;
+ return LoadState::kSuccess;
+}
+
+bool CPDF_DIBBase::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);
+ m_CompData.clear();
+ 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;
+ }
+ if (!GetDecodeAndMaskArray(&m_bDefaultDecode, &m_bColorKey))
+ return false;
+
+ m_bpc = bpc;
+ m_pDecoder = pJpegModule->CreateDecoder(src_data, src_size, m_Width, m_Height,
+ m_nComponents, bTransform);
+ return true;
+}
+
+RetainPtr<CFX_DIBitmap> CPDF_DIBBase::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.Get()));
+ if (!context->decoder())
+ return nullptr;
+
+ 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 nullptr;
+
+ bool bSwapRGB = false;
+ if (m_pColorSpace) {
+ if (components != m_pColorSpace->CountComponents())
+ return nullptr;
+
+ 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;
+ }
+
+ auto pCachedBitmap = pdfium::MakeRetain<CFX_DIBitmap>();
+ if (!pCachedBitmap->Create(width, height, format))
+ return nullptr;
+
+ 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(), pCachedBitmap->GetBuffer(),
+ pCachedBitmap->GetPitch(), output_offsets)) {
+ return nullptr;
+ }
+
+ 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 = pCachedBitmap->GetWritableScanline(row);
+ for (uint32_t col = 0; col < width; ++col) {
+ *scanline = (*scanline) >> scale;
+ ++scanline;
+ }
+ }
+ }
+ m_bpc = 8;
+ return pCachedBitmap;
+}
+
+CPDF_DIBBase::LoadState CPDF_DIBBase::StartLoadMask() {
+ m_MatteColor = 0XFFFFFFFF;
+ m_pMaskStream = m_pDict->GetStreamFor("SMask");
+ if (!m_pMaskStream) {
+ m_pMaskStream = ToStream(m_pDict->GetDirectObjectFor("Mask"));
+ return m_pMaskStream ? StartLoadMaskDIB() : LoadState::kSuccess;
+ }
+
+ const CPDF_Array* pMatte = m_pMaskStream->GetDict()->GetArrayFor("Matte");
+ if (pMatte && m_pColorSpace && m_Family != PDFCS_PATTERN &&
+ m_pColorSpace->CountComponents() <= m_nComponents) {
+ std::vector<float> colors(m_nComponents);
+ for (uint32_t i = 0; i < m_nComponents; i++)
+ colors[i] = pMatte->GetFloatAt(i);
+
+ float R;
+ float G;
+ float B;
+ m_pColorSpace->GetRGB(colors.data(), &R, &G, &B);
+ m_MatteColor = ArgbEncode(0, FXSYS_round(R * 255), FXSYS_round(G * 255),
+ FXSYS_round(B * 255));
+ }
+ return StartLoadMaskDIB();
+}
+
+CPDF_DIBBase::LoadState CPDF_DIBBase::ContinueLoadMaskDIB(
+ PauseIndicatorIface* pPause) {
+ if (!m_pMask)
+ return LoadState::kSuccess;
+
+ LoadState ret = m_pMask->ContinueLoadDIBBase(pPause);
+ if (ret == LoadState::kContinue)
+ return LoadState::kContinue;
+
+ if (m_pColorSpace && m_bStdCS)
+ m_pColorSpace->EnableStdConversion(false);
+
+ if (ret == LoadState::kFail) {
+ m_pMask.Reset();
+ return LoadState::kFail;
+ }
+ return LoadState::kSuccess;
+}
+
+RetainPtr<CPDF_DIBBase> CPDF_DIBBase::DetachMask() {
+ return std::move(m_pMask);
+}
+
+bool CPDF_DIBBase::IsJBigImage() const {
+ return m_pStreamAcc->GetImageDecoder() == "JBIG2Decode";
+}
+
+CPDF_DIBBase::LoadState CPDF_DIBBase::StartLoadMaskDIB() {
+ m_pMask = pdfium::MakeRetain<CPDF_DIBBase>();
+ LoadState ret =
+ m_pMask->StartLoadDIBBase(m_pDocument.Get(), m_pMaskStream.Get(), false,
+ nullptr, nullptr, true, 0, false);
+ if (ret == LoadState::kContinue) {
+ if (m_Status == LoadState::kFail)
+ m_Status = LoadState::kContinue;
+ return LoadState::kContinue;
+ }
+ if (ret == LoadState::kFail)
+ m_pMask.Reset();
+ return LoadState::kSuccess;
+}
+
+void CPDF_DIBBase::LoadPalette() {
+ if (!m_pColorSpace || m_Family == PDFCS_PATTERN)
+ return;
+
+ if (m_bpc == 0 || m_bpc * m_nComponents > 8)
+ 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_CompData[0].m_DecodeMin;
+ color_values[1] = color_values[0];
+ color_values[2] = color_values[0];
+
+ float R = 0.0f;
+ float G = 0.0f;
+ float 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_CompData[0].m_DecodeStep;
+ color_values[1] += m_CompData[0].m_DecodeStep;
+ color_values[2] += m_CompData[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_bpc == 8 && m_bDefaultDecode &&
+ m_pColorSpace == CPDF_ColorSpace::GetStockCS(PDFCS_DEVICEGRAY)) {
+ return;
+ }
+
+ int palette_count = 1 << (m_bpc * m_nComponents);
+ // Using at least 16 elements due to the call m_pColorSpace->GetRGB().
+ std::vector<float> color_values(std::max(m_nComponents, 16u));
+ 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_values[j] = m_CompData[j].m_DecodeMin +
+ m_CompData[j].m_DecodeStep * encoded_component;
+ }
+ float R = 0;
+ float G = 0;
+ float 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_values[0];
+ m_pColorSpace->GetRGB(temp_buf.data(), &R, &G, &B);
+ } else {
+ m_pColorSpace->GetRGB(color_values.data(), &R, &G, &B);
+ }
+ SetPaletteArgb(i, ArgbEncode(255, FXSYS_round(R * 255),
+ FXSYS_round(G * 255), FXSYS_round(B * 255)));
+ }
+}
+
+void CPDF_DIBBase::ValidateDictParam() {
+ m_bpc = m_bpc_orig;
+ const CPDF_Object* pFilter = m_pDict->GetDirectObjectFor("Filter");
+ if (pFilter) {
+ if (pFilter->IsName()) {
+ 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 (const CPDF_Array* pArray = pFilter->AsArray()) {
+ 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_DIBBase::TranslateScanline24bpp(uint8_t* dest_scan,
+ const uint8_t* src_scan) const {
+ if (m_bpc == 0)
+ return;
+
+ if (TranslateScanline24bppDefaultDecode(dest_scan, src_scan))
+ return;
+
+ // Using at least 16 elements due to the call m_pColorSpace->GetRGB().
+ std::vector<float> color_values(std::max(m_nComponents, 16u));
+ float R = 0.0f;
+ float G = 0.0f;
+ float B = 0.0f;
+ uint64_t src_bit_pos = 0;
+ uint64_t src_byte_pos = 0;
+ size_t dest_byte_pos = 0;
+ const bool bpp8 = m_bpc == 8;
+ for (int column = 0; column < m_Width; column++) {
+ for (uint32_t color = 0; color < m_nComponents; color++) {
+ if (bpp8) {
+ uint8_t data = src_scan[src_byte_pos++];
+ color_values[color] = m_CompData[color].m_DecodeMin +
+ m_CompData[color].m_DecodeStep * data;
+ } else {
+ unsigned int data = GetBits8(src_scan, src_bit_pos, m_bpc);
+ color_values[color] = m_CompData[color].m_DecodeMin +
+ m_CompData[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 if (m_Family != PDFCS_PATTERN) {
+ m_pColorSpace->GetRGB(color_values.data(), &R, &G, &B);
+ }
+ R = pdfium::clamp(R, 0.0f, 1.0f);
+ G = pdfium::clamp(G, 0.0f, 1.0f);
+ B = pdfium::clamp(B, 0.0f, 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;
+ }
+}
+
+bool CPDF_DIBBase::TranslateScanline24bppDefaultDecode(
+ uint8_t* dest_scan,
+ const uint8_t* src_scan) const {
+ if (!m_bDefaultDecode)
+ return false;
+
+ if (m_Family != PDFCS_DEVICERGB && m_Family != PDFCS_CALRGB) {
+ if (m_bpc != 8)
+ return false;
+
+ if (m_nComponents == m_pColorSpace->CountComponents()) {
+ m_pColorSpace->TranslateImageLine(dest_scan, src_scan, m_Width, m_Width,
+ m_Height, TransMask());
+ }
+ return true;
+ }
+
+ if (m_nComponents != 3)
+ return true;
+
+ 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:
+ const unsigned int max_data = (1 << m_bpc) - 1;
+ 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 true;
+}
+
+uint8_t* CPDF_DIBBase::GetBuffer() const {
+ return m_pCachedBitmap ? m_pCachedBitmap->GetBuffer() : nullptr;
+}
+
+const uint8_t* CPDF_DIBBase::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.get() : m_pLineBuf.get();
+ 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.get()[i] = ~pSrcLine[i];
+ return m_pLineBuf.get();
+ }
+
+ if (!m_bColorKey) {
+ memcpy(m_pLineBuf.get(), pSrcLine, src_pitch_value);
+ return m_pLineBuf.get();
+ }
+
+ uint32_t reset_argb = m_pPalette ? m_pPalette.get()[0] : 0xFF000000;
+ uint32_t set_argb = m_pPalette ? m_pPalette.get()[1] : 0xFFFFFFFF;
+ if (m_CompData[0].m_ColorKeyMin == 0)
+ reset_argb = 0;
+ if (m_CompData[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.get());
+ for (int col = 0; col < m_Width; col++) {
+ *dest_scan = GetBitValue(pSrcLine, col) ? set_argb : reset_argb;
+ dest_scan++;
+ }
+ return m_pMaskedLine.get();
+ }
+ if (m_bpc * m_nComponents <= 8) {
+ if (m_bpc == 8) {
+ memcpy(m_pLineBuf.get(), 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.get()[col] = color_index;
+ }
+ }
+ if (!m_bColorKey)
+ return m_pLineBuf.get();
+
+ uint8_t* pDestPixel = m_pMaskedLine.get();
+ const uint8_t* pSrcPixel = m_pLineBuf.get();
+ 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 = IsColorIndexOutOfBounds(index, m_CompData[0]) ? 0xFF : 0;
+ pDestPixel++;
+ }
+ return m_pMaskedLine.get();
+ }
+ if (m_bColorKey) {
+ if (m_nComponents == 3 && m_bpc == 8) {
+ uint8_t* alpha_channel = m_pMaskedLine.get() + 3;
+ for (int col = 0; col < m_Width; col++) {
+ const uint8_t* pPixel = pSrcLine + col * 3;
+ alpha_channel[col * 4] =
+ AreColorIndicesOutOfBounds(pPixel, m_CompData.data(), 3) ? 0xFF : 0;
+ }
+ } else {
+ memset(m_pMaskedLine.get(), 0xFF, m_Pitch);
+ }
+ }
+ if (m_pColorSpace) {
+ TranslateScanline24bpp(m_pLineBuf.get(), pSrcLine);
+ pSrcLine = m_pLineBuf.get();
+ }
+ if (!m_bColorKey)
+ return pSrcLine;
+
+ const uint8_t* pSrcPixel = pSrcLine;
+ uint8_t* pDestPixel = m_pMaskedLine.get();
+ for (int col = 0; col < m_Width; col++) {
+ *pDestPixel++ = *pSrcPixel++;
+ *pDestPixel++ = *pSrcPixel++;
+ *pDestPixel++ = *pSrcPixel++;
+ pDestPixel++;
+ }
+ return m_pMaskedLine.get();
+}
+
+bool CPDF_DIBBase::SkipToScanline(int line, PauseIndicatorIface* pPause) const {
+ return m_pDecoder && m_pDecoder->SkipToScanline(line, pPause);
+}
+
+void CPDF_DIBBase::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_DIBBase::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 {
+ if (m_bColorKey && !m_bImageMask) {
+ uint32_t reset_argb = m_pPalette ? m_pPalette.get()[0] : 0xFF000000;
+ uint32_t set_argb = m_pPalette ? m_pPalette.get()[1] : 0xFFFFFFFF;
+ if (m_CompData[0].m_ColorKeyMin == 0)
+ reset_argb = 0;
+ if (m_CompData[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;
+ dest_scan_dword[i] = GetBitValue(pSrcLine, src_x) ? set_argb : reset_argb;
+ }
+ return;
+ }
+
+ 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_pPalette && dest_Bpp != 1) {
+ 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;
+ uint32_t value_argb = GetBitValue(pSrcLine, src_x) ? set_argb : reset_argb;
+ if (dest_Bpp == 1) {
+ dest_scan[dest_pos] = static_cast<uint8_t>(value_argb);
+ } else if (dest_Bpp == 3) {
+ dest_scan[dest_pos] = FXARGB_B(value_argb);
+ dest_scan[dest_pos + 1] = FXARGB_G(value_argb);
+ dest_scan[dest_pos + 2] = FXARGB_R(value_argb);
+ } else {
+ *reinterpret_cast<uint32_t*>(dest_scan + dest_pos) = value_argb;
+ }
+ }
+}
+
+void CPDF_DIBBase::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.get()[col] = color_index;
+ }
+ pSrcLine = m_pLineBuf.get();
+ }
+ 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_CompData[0].m_ColorKeyMin ||
+ index > m_CompData[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_DIBBase::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 = ArgbEncode(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_CompData[j].m_DecodeMin +
+ m_CompData[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 = ArgbEncode(0xFF, color[2], color[1], color[0]);
+ } else {
+ argb = ArgbEncode(0xFF, pSrcPixel[2], pSrcPixel[1], pSrcPixel[0]);
+ }
+ if (m_bColorKey) {
+ int alpha = 0xFF;
+ if (m_nComponents == 3 && m_bpc == 8) {
+ alpha = (pSrcPixel[0] < m_CompData[0].m_ColorKeyMin ||
+ pSrcPixel[0] > m_CompData[0].m_ColorKeyMax ||
+ pSrcPixel[1] < m_CompData[1].m_ColorKeyMin ||
+ pSrcPixel[1] > m_CompData[1].m_ColorKeyMax ||
+ pSrcPixel[2] < m_CompData[2].m_ColorKeyMin ||
+ pSrcPixel[2] > m_CompData[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_DIBBase::TransMask() const {
+ return m_bLoadMask && m_GroupFamily == PDFCS_DEVICECMYK &&
+ m_Family == PDFCS_DEVICECMYK;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-07 03:00:16 +0000