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src/Source/FreeImage/PluginGIF.cpp  view on Meta::CPAN

	PageInfo(int d, int l, int t, int w, int h) { 
		disposal_method = d; left = (WORD)l; top = (WORD)t; width = (WORD)w; height = (WORD)h; 
	}
	int disposal_method;
	WORD left, top, width, height;
};

//GIF defines a max of 12 bits per code
#define MAX_LZW_CODE			4096

class StringTable
{
public:
	StringTable();
	~StringTable();
	void Initialize(int minCodeSize);
	BYTE *FillInputBuffer(int len);
	void CompressStart(int bpp, int width);
	int CompressEnd(BYTE *buf); //0-4 bytes
	bool Compress(BYTE *buf, int *len);
	bool Decompress(BYTE *buf, int *len);
	void Done(void);

protected:
	bool m_done;

	int m_minCodeSize, m_clearCode, m_endCode, m_nextCode;

	int m_bpp, m_slack; //Compressor information

	int m_prefix; //Compressor state variable
	int m_codeSize, m_codeMask; //Compressor/Decompressor state variables
	int m_oldCode; //Decompressor state variable
	int m_partial, m_partialSize; //Compressor/Decompressor bit buffer

	int firstPixelPassed; // A specific flag that indicates if the first pixel
	                      // of the whole image had already been read

	std::string m_strings[MAX_LZW_CODE]; //This is what is really the "string table" data for the Decompressor
	int* m_strmap;

	//input buffer
	BYTE *m_buffer;
	int m_bufferSize, m_bufferRealSize, m_bufferPos, m_bufferShift;

	void ClearCompressorTable(void);
	void ClearDecompressorTable(void);
};

#define GIF_PACKED_LSD_HAVEGCT		0x80
#define GIF_PACKED_LSD_COLORRES		0x70
#define GIF_PACKED_LSD_GCTSORTED	0x08
#define GIF_PACKED_LSD_GCTSIZE		0x07
#define GIF_PACKED_ID_HAVELCT		0x80
#define GIF_PACKED_ID_INTERLACED	0x40
#define GIF_PACKED_ID_LCTSORTED		0x20
#define GIF_PACKED_ID_RESERVED		0x18
#define GIF_PACKED_ID_LCTSIZE		0x07
#define GIF_PACKED_GCE_RESERVED		0xE0
#define GIF_PACKED_GCE_DISPOSAL		0x1C
#define GIF_PACKED_GCE_WAITINPUT	0x02
#define GIF_PACKED_GCE_HAVETRANS	0x01

#define GIF_BLOCK_IMAGE_DESCRIPTOR	0x2C
#define GIF_BLOCK_EXTENSION			0x21
#define GIF_BLOCK_TRAILER			0x3B

#define GIF_EXT_PLAINTEXT			0x01
#define GIF_EXT_GRAPHIC_CONTROL		0xF9
#define GIF_EXT_COMMENT				0xFE
#define GIF_EXT_APPLICATION			0xFF

#define GIF_INTERLACE_PASSES		4
static int g_GifInterlaceOffset[GIF_INTERLACE_PASSES] = {0, 4, 2, 1};
static int g_GifInterlaceIncrement[GIF_INTERLACE_PASSES] = {8, 8, 4, 2};

// ==========================================================
// Helpers Functions
// ==========================================================

static BOOL 
FreeImage_SetMetadataEx(FREE_IMAGE_MDMODEL model, FIBITMAP *dib, const char *key, WORD id, FREE_IMAGE_MDTYPE type, DWORD count, DWORD length, const void *value)
{
	BOOL bResult = FALSE;
	FITAG *tag = FreeImage_CreateTag();
	if(tag) {
		FreeImage_SetTagKey(tag, key);
		FreeImage_SetTagID(tag, id);
		FreeImage_SetTagType(tag, type);
		FreeImage_SetTagCount(tag, count);
		FreeImage_SetTagLength(tag, length);
		FreeImage_SetTagValue(tag, value);
		if(model == FIMD_ANIMATION) {
			TagLib& s = TagLib::instance();
			// get the tag description
			const char *description = s.getTagDescription(TagLib::ANIMATION, id);
			FreeImage_SetTagDescription(tag, description);
		}
		// store the tag
		bResult = FreeImage_SetMetadata(model, dib, key, tag);
		FreeImage_DeleteTag(tag);
	}
	return bResult;
}

static BOOL 
FreeImage_GetMetadataEx(FREE_IMAGE_MDMODEL model, FIBITMAP *dib, const char *key, FREE_IMAGE_MDTYPE type, FITAG **tag)
{
	if( FreeImage_GetMetadata(model, dib, key, tag) ) {
		if( FreeImage_GetTagType(*tag) == type ) {
			return TRUE;
		}
	}
	return FALSE;
}

StringTable::StringTable()
{
	m_buffer = NULL;
	firstPixelPassed = 0; // Still no pixel read
	// Maximum number of entries in the map is MAX_LZW_CODE * 256