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6537ba19c3
- add new FASTOCTREE quantizer with alpha support
- make ZIP compress level and type configurable
- support reading/writing PNGs with paletted alpha
source 3637439d51
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
/*
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* The Python Imaging Library.
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* $Id$
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*
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* declarations for the ZIP codecs
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*
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* Copyright (c) Fredrik Lundh 1996.
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*/
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#include "zlib.h"
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/* modes */
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#define ZIP_PNG 0 /* continuous, filtered image data */
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#define ZIP_PNG_PALETTE 1 /* non-continuous data, disable filtering */
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#define ZIP_TIFF_PREDICTOR 2 /* TIFF, with predictor */
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#define ZIP_TIFF 3 /* TIFF, without predictor */
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typedef struct {
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/* CONFIGURATION */
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/* Codec mode */
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int mode;
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/* Optimize (max compression) SLOW!!! */
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int optimize;
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/* 0 no compression, 9 best compression, -1 default compression */
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int compress_level;
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/* compression strategy Z_XXX */
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int compress_type;
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/* Predefined dictionary (experimental) */
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char* dictionary;
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int dictionary_size;
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/* PRIVATE CONTEXT (set by decoder/encoder) */
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z_stream z_stream; /* (de)compression stream */
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UINT8* previous; /* previous line (allocated) */
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int last_output; /* # bytes last output by inflate */
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/* Compressor specific stuff */
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UINT8* prior; /* filter storage (allocated) */
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UINT8* up;
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UINT8* average;
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UINT8* paeth;
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UINT8* output; /* output data */
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int prefix; /* size of filter prefix (0 for TIFF data) */
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int interlaced; /* is the image interlaced? (PNG) */
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int pass; /* current pass of the interlaced image (PNG) */
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} ZIPSTATE;
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