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JBIG2 - text region segment

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Jakub Melka
2019-11-01 16:47:30 +01:00
parent ca78f61260
commit fc6985e35a
3 changed files with 535 additions and 99 deletions
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80
PdfForQtLib/sources/pdfjbig2decoder.h
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@@ -31,6 +31,9 @@ class PDFJBIG2HuffmanCodeTable;
class PDFJBIG2SymbolDictionary;
struct PDFJBIG2HuffmanTableEntry;
struct PDFJBIG2BitmapDecodingParameters;
struct PDFJBIG2TextRegionDecodingParameters;
struct PDFJBIG2BitmapRefinementDecodingParameters;
enum class PDFJBIG2BitOperation
{
@@ -304,6 +307,9 @@ public:
/// Constructs huffman decoder from huffman code table, in this case, memory is allocated
explicit PDFJBIG2HuffmanDecoder(PDFBitReader* reader, const PDFJBIG2HuffmanCodeTable* table);
/// Constructs huffman decoder from huffman code table, in this case, memory is allocated
explicit PDFJBIG2HuffmanDecoder(PDFBitReader* reader, std::vector<PDFJBIG2HuffmanTableEntry>&& table);
/// Returns true, if huffman table is valid (and usable)
bool isValid() const { return m_begin != m_end; }
@@ -418,6 +424,14 @@ struct PDFJBIG2ReferencedSegments
std::vector<const PDFJBIG2Bitmap*> bitmaps;
std::vector<const PDFJBIG2HuffmanCodeTable*> codeTables;
std::vector<const PDFJBIG2SymbolDictionary*> symbolDictionaries;
size_t currentUserCodeTableIndex = 0;
/// Returns symbol bitmaps from all symbol dictionaries
std::vector<const PDFJBIG2Bitmap*> getSymbolBitmaps() const;
/// Returns current user huffman table according the index. If index
/// is out of range, then exception is thrown.
PDFJBIG2HuffmanDecoder getUserTable(PDFBitReader* reader);
};
/// Region segment information field, see chapter 7.4.1 in the specification
@@ -439,72 +453,6 @@ struct PDFJBIG2ATPosition
using PDFJBIG2ATPositions = std::array<PDFJBIG2ATPosition, 4>;
/// Info structure for bitmap decoding parameters
struct PDFJBIG2BitmapDecodingParameters
{
/// Is Modified-Modified-Read encoding used? This encoding is simalr to CCITT pure 2D encoding.
bool MMR = false;
/// Is typical prediction for generic direct coding used?
bool TPGDON = false;
/// Width of the image
int GBW = 0;
/// Height of the image
int GBH = 0;
/// Template mode (not used for MMR).
uint8_t GBTEMPLATE = 0;
/// Positions of adaptative pixels
PDFJBIG2ATPositions ATXY = { };
/// Data with encoded image
QByteArray data;
/// State of arithmetic decoder
PDFJBIG2ArithmeticDecoderState* arithmeticDecoderState = nullptr;
/// Skip bitmap (pixel is skipped if corresponding pixel in the
/// skip bitmap is 1). Set to nullptr, if not used.
const PDFJBIG2Bitmap* SKIP = nullptr;
/// Arithmetic decoder (used, if MMR == false)
PDFJBIG2ArithmeticDecoder* arithmeticDecoder = nullptr;
};
/// Info structure for refinement bitmap decoding parameters
struct PDFJBIG2BitmapRefinementDecodingParameters
{
/// Template mode used (0/1)
uint8_t GRTEMPLATE = 0;
/// Prediction (same as previous row)
bool TPGRON = false;
/// Bitmap width
uint32_t GRW = 0;
/// Bitmap height
uint32_t GRH = 0;
/// Reference bitmap
const PDFJBIG2Bitmap* GRREFERENCE = nullptr;
/// Offset x
int32_t GRREFERENCEX = 0;
/// Offset y
int32_t GRREFERENCEY = 0;
/// State of arithmetic decoder
PDFJBIG2ArithmeticDecoderState* arithmeticDecoderState = nullptr;
/// Positions of adaptative pixels
PDFJBIG2ATPositions GRAT = { };
};
/// Info structure for symbol dictionary decoding procedure
struct PDFJBIG2SymbolDictionaryDecodingParameters
{