Pillow/src/libImaging/Jpeg.h

/*
 * The Python Imaging Library.
 * $Id$
 *
 * declarations for the IJG JPEG codec interface.
 *
 * Copyright (c) 1995-2001 by Secret Labs AB
 * Copyright (c) 1995-1996 by Fredrik Lundh
 */

#include "jpeglib.h"

#include <setjmp.h>

typedef struct {
    struct jpeg_error_mgr pub; /* "public" fields */
    jmp_buf setjmp_buffer;     /* for return to caller */
} JPEGERROR;

/* -------------------------------------------------------------------- */
/* Decoder                                                              */

typedef struct {
    struct jpeg_source_mgr pub;
    int skip;
} JPEGSOURCE;

typedef struct {
    /* CONFIGURATION */

    /* Jpeg file mode (empty if not known) */
    char jpegmode[8 + 1];

    /* Converter output mode (input to the shuffler).  If empty,
       convert conversions are disabled */
    char rawmode[8 + 1];

    /* If set, trade quality for speed */
    int draft;

    /* Scale factor (1, 2, 4, 8) */
    int scale;

    /* PRIVATE CONTEXT (set by decoder) */

    struct jpeg_decompress_struct cinfo;

    JPEGERROR error;

    JPEGSOURCE source;

} JPEGSTATE;

/* -------------------------------------------------------------------- */
/* Encoder                                                              */

typedef struct {
    struct jpeg_destination_mgr pub;
    /* might add something some other day */
} JPEGDESTINATION;

typedef struct {
    /* CONFIGURATION */

    /* Quality (0-100, -1 means default) */
    int quality;

    /* Progressive mode */
    int progressive;

    /* Smoothing factor (1-100, 0 means none) */
    int smooth;

    /* Optimize Huffman tables (slow) */
    int optimize;

    /* Stream type (0=full, 1=tables only, 2=image only) */
    int streamtype;

    /* DPI setting (0=square pixels, otherwise DPI) */
    int xdpi, ydpi;

    /* Chroma Subsampling (-1=default, 0=none, 1=medium, 2=high) */
    int subsampling;

    /* Converter input mode (input to the shuffler) */
    char rawmode[8 + 1];

    /* Custom quantization tables () */
    unsigned int *qtables;

    /* in factors of DCTSIZE2 */
    int qtablesLen;

    /* Extra data (to be injected after header) */
    char *extra;
    int extra_size;

    /* PRIVATE CONTEXT (set by encoder) */

    struct jpeg_compress_struct cinfo;

    JPEGERROR error;

    JPEGDESTINATION destination;

    int extra_offset;

    size_t rawExifLen; /* EXIF data length */
    char *rawExif;     /* EXIF buffer pointer */

} JPEGENCODERSTATE;