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JBIG2 - reading text segment
This commit is contained in:
Jakub Melka
@ -22,9 +22,185 @@
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namespace pdf
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{
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/// Info structure for text region decoding structure
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struct PDFJBIG2TextRegionDecodingParameters
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/// Structure containing arithmetic decoder states
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struct PDFJBIG2ArithmeticDecoderStates
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{
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enum
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{
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IADH,
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IADW,
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IAEX,
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IADT,
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IAFS,
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IADS,
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IAIT,
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IARI,
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IARDW,
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IARDH,
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IARDX,
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IARDY,
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IAID,
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Generic,
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Refinement,
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End
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};
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/// Resets integer arithmetic decoder statistics. For normal register, it uses context
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/// of length 9 bits (512 states), for IAID, it uses \p IAIDbits bits for the context.
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/// \param IAIDbits Bit length of context for IAID
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void resetArithmeticStatesInteger(const uint8_t IAIDbits);
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/// Reset arithmetic decoder stats for generic
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/// \param templateMode Template mode
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/// \param state State to copy from (can be nullptr)
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void resetArithmeticStatesGeneric(const uint8_t templateMode, const PDFJBIG2ArithmeticDecoderState* state);
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/// Reset arithmetic decoder stats for generic refinement
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/// \param templateMode Template mode
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/// \param state State to copy from (can be nullptr)
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void resetArithmeticStatesGenericRefinement(const uint8_t templateMode, const PDFJBIG2ArithmeticDecoderState* state);
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/// Reset arithmetic decoder stats for generic
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/// \param newState State to be reset
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/// \param templateMode Template mode
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/// \param state State to copy from (can be nullptr)
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static void resetArithmeticStatesGeneric(PDFJBIG2ArithmeticDecoderState* newState, const uint8_t templateMode, const PDFJBIG2ArithmeticDecoderState* state);
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/// Reset arithmetic decoder stats for generic refinement
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/// \param newState State to be reset
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/// \param templateMode Template mode
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/// \param state State to copy from (can be nullptr)
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static void resetArithmeticStatesGenericRefinement(PDFJBIG2ArithmeticDecoderState* newState, const uint8_t templateMode, const PDFJBIG2ArithmeticDecoderState* state);
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std::array<PDFJBIG2ArithmeticDecoderState, End> states;
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};
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void PDFJBIG2ArithmeticDecoderStates::resetArithmeticStatesInteger(const uint8_t IAIDbits)
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{
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for (auto context : { IADH, IADW, IAEX, IADT, IAFS, IADS, IAIT, IARI, IARDW, IARDH, IARDX,IARDY })
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{
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states[context].reset(9);
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}
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states[IAID].reset(IAIDbits);
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}
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void PDFJBIG2ArithmeticDecoderStates::resetArithmeticStatesGeneric(const uint8_t templateMode, const PDFJBIG2ArithmeticDecoderState* state)
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{
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resetArithmeticStatesGeneric(&states[Generic], templateMode, state);
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}
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void PDFJBIG2ArithmeticDecoderStates::resetArithmeticStatesGenericRefinement(const uint8_t templateMode, const PDFJBIG2ArithmeticDecoderState* state)
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{
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resetArithmeticStatesGenericRefinement(&states[Refinement], templateMode, state);
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}
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void PDFJBIG2ArithmeticDecoderStates::resetArithmeticStatesGeneric(PDFJBIG2ArithmeticDecoderState* newState, const uint8_t templateMode, const PDFJBIG2ArithmeticDecoderState* state)
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{
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uint8_t bits = 0;
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switch (templateMode)
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{
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case 0:
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bits = 16;
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break;
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case 1:
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bits = 13;
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break;
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case 2:
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case 3:
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bits = 10;
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break;
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default:
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Q_ASSERT(false);
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break;
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}
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if (!state)
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{
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newState->reset(bits);
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}
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else
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{
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newState->reset(bits, *state);
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}
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}
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void PDFJBIG2ArithmeticDecoderStates::resetArithmeticStatesGenericRefinement(PDFJBIG2ArithmeticDecoderState* newState, const uint8_t templateMode, const PDFJBIG2ArithmeticDecoderState* state)
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{
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uint8_t bits = 0;
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switch (templateMode)
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{
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case 0:
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bits = 13;
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break;
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case 1:
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bits = 10;
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break;
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default:
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Q_ASSERT(false);
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break;
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}
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if (!state)
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{
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newState->reset(bits);
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}
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else
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{
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newState->reset(bits, *state);
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}
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}
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/// Structure containing state pointers for arithmetic decoder
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struct PDFJBIG2ArithmeticDecoderStatePointers
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{
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void initializeFrom(PDFJBIG2ArithmeticDecoderStates* states);
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PDFJBIG2ArithmeticDecoderState* IADT = nullptr;
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PDFJBIG2ArithmeticDecoderState* IAFS = nullptr;
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PDFJBIG2ArithmeticDecoderState* IADS = nullptr;
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PDFJBIG2ArithmeticDecoderState* IAIT = nullptr;
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PDFJBIG2ArithmeticDecoderState* IAID = nullptr;
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PDFJBIG2ArithmeticDecoderState* IARI = nullptr;
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PDFJBIG2ArithmeticDecoderState* IARDW = nullptr;
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PDFJBIG2ArithmeticDecoderState* IARDH = nullptr;
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PDFJBIG2ArithmeticDecoderState* IARDX = nullptr;
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PDFJBIG2ArithmeticDecoderState* IARDY = nullptr;
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PDFJBIG2ArithmeticDecoderState* genericDecoderState = nullptr;
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PDFJBIG2ArithmeticDecoderState* refinementDecoderState = nullptr;
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};
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void PDFJBIG2ArithmeticDecoderStatePointers::initializeFrom(PDFJBIG2ArithmeticDecoderStates* states)
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{
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IADT = &states->states[PDFJBIG2ArithmeticDecoderStates::IADT];
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IAFS = &states->states[PDFJBIG2ArithmeticDecoderStates::IAFS];
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IADS = &states->states[PDFJBIG2ArithmeticDecoderStates::IADS];
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IAIT = &states->states[PDFJBIG2ArithmeticDecoderStates::IAIT];
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IAID = &states->states[PDFJBIG2ArithmeticDecoderStates::IAID];
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IARI = &states->states[PDFJBIG2ArithmeticDecoderStates::IARI];
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IARDW = &states->states[PDFJBIG2ArithmeticDecoderStates::IARDW];
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IARDH = &states->states[PDFJBIG2ArithmeticDecoderStates::IARDH];
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IARDX = &states->states[PDFJBIG2ArithmeticDecoderStates::IARDX];
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IARDY = &states->states[PDFJBIG2ArithmeticDecoderStates::IARDY];
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genericDecoderState = &states->states[PDFJBIG2ArithmeticDecoderStates::Generic];
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refinementDecoderState = &states->states[PDFJBIG2ArithmeticDecoderStates::Refinement];
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}
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/// Info structure for text region decoding structure
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struct PDFJBIG2TextRegionDecodingParameters : public PDFJBIG2ArithmeticDecoderStatePointers
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{
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enum : uint8_t
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{
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BOTTOMLEFT = 0,
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TOPLEFT = 1,
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BOTTOMRIGHT = 2,
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TOPRIGHT = 3
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};
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bool SBHUFF = false;
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bool SBREFINE = false;
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uint8_t SBDEFPIXEL = 0;
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@ -1062,6 +1238,9 @@ void PDFJBIG2Decoder::processSymbolDictionary(const PDFJBIG2SegmentHeader& heade
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parameters.SDINSYMS = references.getSymbolBitmaps();
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parameters.SDNUMINSYMS = static_cast<uint32_t>(parameters.SDINSYMS.size());
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/* Arithmetic decoder stats */
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PDFJBIG2ArithmeticDecoderStates arithmeticDecoderStates;
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/* 7.4.2.1.6 - huffman table selection */
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if (parameters.SDHUFF)
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@ -1147,11 +1326,11 @@ void PDFJBIG2Decoder::processSymbolDictionary(const PDFJBIG2SegmentHeader& heade
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throw PDFException(PDFTranslationContext::tr("JBIG2 trying to use aritmetic decoder context from previous symbol dictionary, but it doesn't exist."));
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}
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resetArithmeticStatesGeneric(parameters.SDTEMPLATE, &references.symbolDictionaries.back()->getGenericState());
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arithmeticDecoderStates.resetArithmeticStatesGeneric(parameters.SDTEMPLATE, &references.symbolDictionaries.back()->getGenericState());
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}
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else
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{
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resetArithmeticStatesGeneric(parameters.SDTEMPLATE, nullptr);
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arithmeticDecoderStates.resetArithmeticStatesGeneric(parameters.SDTEMPLATE, nullptr);
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}
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if (parameters.SDREFAGG)
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@ -1163,11 +1342,11 @@ void PDFJBIG2Decoder::processSymbolDictionary(const PDFJBIG2SegmentHeader& heade
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throw PDFException(PDFTranslationContext::tr("JBIG2 trying to use aritmetic decoder context from previous symbol dictionary, but it doesn't exist."));
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}
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resetArithmeticStatesGenericRefinement(parameters.SDRTEMPLATE, &references.symbolDictionaries.back()->getGenericRefinementState());
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arithmeticDecoderStates.resetArithmeticStatesGenericRefinement(parameters.SDRTEMPLATE, &references.symbolDictionaries.back()->getGenericRefinementState());
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}
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else
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{
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resetArithmeticStatesGenericRefinement(parameters.SDRTEMPLATE, nullptr);
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arithmeticDecoderStates.resetArithmeticStatesGenericRefinement(parameters.SDRTEMPLATE, nullptr);
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}
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}
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}
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@ -1244,7 +1423,7 @@ void PDFJBIG2Decoder::processSymbolDictionary(const PDFJBIG2SegmentHeader& heade
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bitmapParameters.TPGDON = false;
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bitmapParameters.ATXY = parameters.SDAT;
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bitmapParameters.arithmeticDecoder = &decoder;
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bitmapParameters.arithmeticDecoderState = &m_arithmeticDecoderStates[Generic];
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bitmapParameters.arithmeticDecoderState = &arithmeticDecoderStates.states[PDFJBIG2ArithmeticDecoderStates::Generic];
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parameters.SDNEWSYMS[NSYMSDECODED] = readBitmap(bitmapParameters);
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}
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else
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@ -1311,8 +1490,8 @@ void PDFJBIG2Decoder::processSymbolDictionary(const PDFJBIG2SegmentHeader& heade
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if (parameters.isArithmeticCodingStateRetained)
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{
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savedGeneric = qMove(m_arithmeticDecoderStates[Generic]);
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savedRefine = qMove(m_arithmeticDecoderStates[Refinement]);
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savedGeneric = qMove(arithmeticDecoderStates.states[PDFJBIG2ArithmeticDecoderStates::Generic]);
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savedRefine = qMove(arithmeticDecoderStates.states[PDFJBIG2ArithmeticDecoderStates::Refinement]);
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}
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m_segments[header.getSegmentNumber()] = std::make_unique<PDFJBIG2SymbolDictionary>(qMove(bitmaps), qMove(savedGeneric), qMove(savedRefine));
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@ -1646,9 +1825,13 @@ void PDFJBIG2Decoder::processTextRegion(const PDFJBIG2SegmentHeader& header)
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parameters.arithmeticDecoder = &decoder;
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}
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PDFJBIG2ArithmeticDecoderStates arithmeticDecoderStates;
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arithmeticDecoderStates.resetArithmeticStatesInteger(parameters.SBSYMCODELEN);
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parameters.initializeFrom(&arithmeticDecoderStates);
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if (parameters.SBREFINE)
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{
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resetArithmeticStatesGenericRefinement(parameters.SBRTEMPLATE, nullptr);
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arithmeticDecoderStates.resetArithmeticStatesGenericRefinement(parameters.SBRTEMPLATE, nullptr);
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}
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parameters.reader = &m_reader;
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@ -1699,11 +1882,13 @@ void PDFJBIG2Decoder::processGenericRegion(const PDFJBIG2SegmentHeader& header)
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throw PDFException(PDFTranslationContext::tr("JBIG2 - malformed generic region flags."));
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}
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PDFJBIG2ArithmeticDecoderState genericState;
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if (!parameters.MMR)
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{
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// We will use arithmetic coding, read template pixels and reset arithmetic coder state
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parameters.ATXY = readATTemplatePixelPositions((parameters.GBTEMPLATE == 0) ? 4 : 1);
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resetArithmeticStatesGeneric(parameters.GBTEMPLATE, nullptr);
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PDFJBIG2ArithmeticDecoderStates::resetArithmeticStatesGeneric(&genericState, parameters.GBTEMPLATE, nullptr);
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}
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// Determine segment data length
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@ -1741,7 +1926,7 @@ void PDFJBIG2Decoder::processGenericRegion(const PDFJBIG2SegmentHeader& header)
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parameters.data = m_reader.getStream()->mid(segmentDataStartPosition, segmentDataBytes);
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parameters.GBW = field.width;
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parameters.GBH = field.height;
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parameters.arithmeticDecoderState = &m_arithmeticDecoderStates[Generic];
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parameters.arithmeticDecoderState = &genericState;
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PDFBitReader reader(¶meters.data, 1);
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@ -1829,7 +2014,8 @@ void PDFJBIG2Decoder::processGenericRefinementRegion(const PDFJBIG2SegmentHeader
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throw PDFException(PDFTranslationContext::tr("JBIG2 - invalid referred bitmap size [%1 x %2] instead of [%3 x %4] for generic refinement region.").arg(GRREFERENCE.getWidth()).arg(GRREFERENCE.getHeight()).arg(field.width).arg(field.height));
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}
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resetArithmeticStatesGenericRefinement(GRTEMPLATE, nullptr);
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PDFJBIG2ArithmeticDecoderState refinementState;
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PDFJBIG2ArithmeticDecoderStates::resetArithmeticStatesGenericRefinement(&refinementState, GRTEMPLATE, nullptr);
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PDFJBIG2BitmapRefinementDecodingParameters parameters;
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parameters.GRTEMPLATE = GRTEMPLATE;
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@ -1837,7 +2023,7 @@ void PDFJBIG2Decoder::processGenericRefinementRegion(const PDFJBIG2SegmentHeader
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parameters.GRW = field.width;
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parameters.GRH = field.height;
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parameters.GRAT = GRAT;
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parameters.arithmeticDecoderState = &m_arithmeticDecoderStates[Refinement];
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parameters.arithmeticDecoderState = &refinementState;
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parameters.GRREFERENCE = &GRREFERENCE;
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parameters.GRREFERENCEX = 0;
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parameters.GRREFERENCEY = 0;
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@ -2444,7 +2630,7 @@ PDFJBIG2Bitmap PDFJBIG2Decoder::readTextBitmap(PDFJBIG2TextRegionDecodingParamet
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bool RI = 0;
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if (parameters.SBREFINE)
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{
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RI = parameters.SBHUFF ? parameters.reader->read(1) : parameters.arithmeticDecoder->getSignedInteger(parameters.IARI);
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RI = parameters.SBHUFF ? parameters.reader->read(1) : checkInteger(parameters.arithmeticDecoder->getSignedInteger(parameters.IARI));
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}
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PDFJBIG2Bitmap IB;
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@ -2461,11 +2647,14 @@ PDFJBIG2Bitmap PDFJBIG2Decoder::readTextBitmap(PDFJBIG2TextRegionDecodingParamet
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int32_t RDY = checkInteger(parameters.SBHUFF ? parameters.SBHUFFRDY.readSignedInteger() : parameters.arithmeticDecoder->getSignedInteger(parameters.IARDY));
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/* 6.4.11 5) */
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int32_t position = 0;
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int32_t bmsize = parameters.SBHUFF ? checkInteger(parameters.SBHUFFRSIZE.readSignedInteger()) : 0;
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if (parameters.SBHUFF)
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{
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parameters.reader->alignToBytes();
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position = parameters.reader->getPosition();
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parameters.arithmeticDecoder->initialize();
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}
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/* 6.4.11 6) */
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@ -2487,18 +2676,104 @@ PDFJBIG2Bitmap PDFJBIG2Decoder::readTextBitmap(PDFJBIG2TextRegionDecodingParamet
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refinementParameters.GRAT = parameters.SBRAT;
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IB = readRefinementBitmap(refinementParameters);
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/* 6.4.11 7 */
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/* 6.4.11 7) */
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if (parameters.SBHUFF)
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{
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parameters.reader->alignToBytes();
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parameters.reader->seek(position + bmsize);
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}
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}
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pokracovat zde
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const int32_t WI = IB.getWidth();
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const int32_t HI = IB.getHeight();
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/* 6.4.5. step 3) vi) */
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if (parameters.TRANSPOSED == 0 && (parameters.REFCORNER == PDFJBIG2TextRegionDecodingParameters::TOPRIGHT ||
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parameters.REFCORNER == PDFJBIG2TextRegionDecodingParameters::BOTTOMRIGHT))
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{
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CURS += WI - 1;
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}
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if (parameters.TRANSPOSED == 1 && (parameters.REFCORNER == PDFJBIG2TextRegionDecodingParameters::BOTTOMLEFT ||
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parameters.REFCORNER == PDFJBIG2TextRegionDecodingParameters::BOTTOMRIGHT))
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{
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CURS += HI - 1;
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}
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/* 6.4.5. step 3) c) vii) */
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const int32_t SI = CURS;
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/* 6.4.5. step 3) c) viii) + ix) */
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if (parameters.TRANSPOSED == 0)
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{
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// Standard
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switch (parameters.REFCORNER)
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{
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case PDFJBIG2TextRegionDecodingParameters::TOPLEFT:
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SBREG.paint(IB, SI, TI, parameters.SBCOMBOP, false, 0x00);
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break;
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case PDFJBIG2TextRegionDecodingParameters::TOPRIGHT:
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SBREG.paint(IB, SI - WI + 1, TI, parameters.SBCOMBOP, false, 0x00);
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break;
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case PDFJBIG2TextRegionDecodingParameters::BOTTOMLEFT:
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SBREG.paint(IB, SI, TI - HI + 1, parameters.SBCOMBOP, false, 0x00);
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break;
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case PDFJBIG2TextRegionDecodingParameters::BOTTOMRIGHT:
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SBREG.paint(IB, SI - WI + 1, TI - HI + 1, parameters.SBCOMBOP, false, 0x00);
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break;
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default:
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Q_ASSERT(false);
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break;
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}
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}
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else
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{
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// Transposed
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switch (parameters.REFCORNER)
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{
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case PDFJBIG2TextRegionDecodingParameters::TOPLEFT:
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SBREG.paint(IB, TI, SI, parameters.SBCOMBOP, false, 0x00);
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break;
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case PDFJBIG2TextRegionDecodingParameters::TOPRIGHT:
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SBREG.paint(IB, TI - WI + 1, SI, parameters.SBCOMBOP, false, 0x00);
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break;
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case PDFJBIG2TextRegionDecodingParameters::BOTTOMLEFT:
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SBREG.paint(IB, TI, SI - HI + 1, parameters.SBCOMBOP, false, 0x00);
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break;
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case PDFJBIG2TextRegionDecodingParameters::BOTTOMRIGHT:
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SBREG.paint(IB, TI - WI + 1, SI - HI + 1, parameters.SBCOMBOP, false, 0x00);
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break;
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default:
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Q_ASSERT(false);
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break;
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}
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}
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/* 6.4.5. step 3) c) x) */
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if (parameters.TRANSPOSED == 0 && (parameters.REFCORNER == PDFJBIG2TextRegionDecodingParameters::TOPLEFT ||
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parameters.REFCORNER == PDFJBIG2TextRegionDecodingParameters::BOTTOMLEFT))
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{
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CURS += WI - 1;
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}
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if (parameters.TRANSPOSED == 1 && (parameters.REFCORNER == PDFJBIG2TextRegionDecodingParameters::TOPLEFT ||
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parameters.REFCORNER == PDFJBIG2TextRegionDecodingParameters::TOPRIGHT))
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{
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CURS += HI - 1;
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}
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/* 6.4.5. step 3) c) xi) */
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++NINSTANCES;
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}
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}
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/* 6.4.5 4) */
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return SBREG;
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}
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@ -2563,67 +2838,6 @@ PDFJBIG2ATPositions PDFJBIG2Decoder::readATTemplatePixelPositions(int count)
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return result;
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}
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|
||||
void PDFJBIG2Decoder::resetArithmeticStatesGeneric(const uint8_t templateMode, const PDFJBIG2ArithmeticDecoderState* state)
|
||||
{
|
||||
uint8_t bits = 0;
|
||||
switch (templateMode)
|
||||
{
|
||||
case 0:
|
||||
bits = 16;
|
||||
break;
|
||||
|
||||
case 1:
|
||||
bits = 13;
|
||||
break;
|
||||
|
||||
case 2:
|
||||
case 3:
|
||||
bits = 10;
|
||||
break;
|
||||
|
||||
default:
|
||||
Q_ASSERT(false);
|
||||
break;
|
||||
}
|
||||
|
||||
if (!state)
|
||||
{
|
||||
m_arithmeticDecoderStates[Generic].reset(bits);
|
||||
}
|
||||
else
|
||||
{
|
||||
m_arithmeticDecoderStates[Generic].reset(bits, *state);
|
||||
}
|
||||
}
|
||||
|
||||
void PDFJBIG2Decoder::resetArithmeticStatesGenericRefinement(const uint8_t templateMode, const PDFJBIG2ArithmeticDecoderState* state)
|
||||
{
|
||||
uint8_t bits = 0;
|
||||
switch (templateMode)
|
||||
{
|
||||
case 0:
|
||||
bits = 13;
|
||||
break;
|
||||
|
||||
case 1:
|
||||
bits = 10;
|
||||
break;
|
||||
|
||||
default:
|
||||
Q_ASSERT(false);
|
||||
break;
|
||||
}
|
||||
|
||||
if (!state)
|
||||
{
|
||||
m_arithmeticDecoderStates[Refinement].reset(bits);
|
||||
}
|
||||
else
|
||||
{
|
||||
m_arithmeticDecoderStates[Refinement].reset(bits, *state);
|
||||
}
|
||||
}
|
||||
|
||||
void PDFJBIG2Decoder::skipSegment(const PDFJBIG2SegmentHeader& header)
|
||||
{
|
||||
if (header.isSegmentDataLengthDefined())
|
||||
@ -2785,6 +2999,11 @@ void PDFJBIG2Bitmap::paint(const PDFJBIG2Bitmap& bitmap, int offsetX, int offset
|
||||
const int sourceX = targetX - targetStartX;
|
||||
const int sourceY = targetY - targetStartY;
|
||||
|
||||
if (targetX < 0 || targetX >= m_width || targetY < 0 || targetY >= m_height)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
switch (operation)
|
||||
{
|
||||
case PDFJBIG2BitOperation::Or:
|
||||
|
||||
Reference in New Issue
Block a user