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-rw-r--r--core/fpdfapi/render/cpdf_dibsource.cpp1480
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;
+}