export.h(1)

libAfterImage/export.h
 Image output into different file formats.
 Structures :
          ASXpmExportParams
          ASPngExportParams
          ASJpegExportParams
          ASGifExportParams
          ASImageExportParams
 Functions :
        ASImage2file()
 Other libAfterImage modules :
          ascmap.h asfont.h asimage.h asvisual.h blender.h export.h
          import.h transform.h ximage.h
  Sasha Vasko <sasha at aftercode dot net>

libAfterImage/ExportFlags
 Some common flags that could be used while writing images into
 different file formats.
    #define EXPORT_GRAYSCALE            (0x01<<0)
    #define EXPORT_ALPHA                (0x01<<1)
    #define EXPORT_APPEND               (0x01<<3)  /* adds subimage  */

libAfterImage/ASXpmExportParams
  ASXpmExportParams

 ASXpmExportParams - parameters for export into XPM file.
    typedef struct
    {
        ASImageFileTypes type;
        ASFlagType flags ;
        int dither ;
        int opaque_threshold ;
        int max_colors ;
    }ASXpmExportParams ;

libAfterImage/ASPngExportParams
  ASPngExportParams

 ASPngExportParams - parameters for export into PNG file.
    typedef struct
    {
        ASImageFileTypes type;
        ASFlagType flags ;
        int compression ;
    }ASPngExportParams ;

libAfterImage/ASJpegExportParams
  ASJpegExportParams

 ASJpegExportParams - parameters for export into JPEG file.
    typedef struct
    {
        ASImageFileTypes type;
        ASFlagType flags ;
        int quality ;
    }ASJpegExportParams ;

libAfterImage/ASGifExportParams
  ASGifExportParams

 ASGifExportParams - parameters for export into GIF file.
    typedef struct
    {
        ASImageFileTypes type;
        ASFlagType flags ;
        int dither ;
        int opaque_threshold ;
        unsigned short animate_delay ;
    }ASGifExportParams ;

libAfterImage/ASTiffExportParams
  ASTiffExportParams

 ASTiffExportParams - parameters for export into TIFF file.
    typedef struct
    {
        ASImageFileTypes type;
        ASFlagType flags ;
        CARD32 rows_per_strip ;

    /* these are suitable compressions : */
    #define TIFF_COMPRESSION_NONE       1
    #define TIFF_COMPRESSION_OJPEG      6   /* !6.0 JPEG */
    #define TIFF_COMPRESSION_JPEG       7
    #define TIFF_COMPRESSION_PACKBITS   32773   /* Macintosh RLE */
    #define TIFF_COMPRESSION_DEFLATE    32946   /* Deflate compression */
        /* you should be able to use other values from tiff.h as well */
        CARD32 compression_type ;
        int jpeg_quality ;

        int opaque_threshold ;
    }ASTiffExportParams ;

libAfterImage/ASImageExportParams
  ASImageExportParams

 ASImageExportParams - union of structures holding parameters for
   export into different file formats.
 Treatment of this union depends on what type of export was requested.
 ASImageFileTypes
    typedef union ASImageExportParams
    {
        ASImageFileTypes   type;
        ASXpmExportParams  xpm;
        ASPngExportParams  png;
        ASJpegExportParams jpeg;
        ASGifExportParams  gif;
        ASTiffExportParams tiff;
    }ASImageExportParams;

libAfterImage/export/ASImage2file()
 Bool ASImage2file( ASImage *im, const char *dir, const char *file,
                  ASImageFileTypes type, ASImageExportParams *params );
 im         - Image to write out.
 dir          - directory name to write file into (optional,
                could be NULL)
 file         - file name with or without directory name.
 type         - output file format. ( see ASImageFileTypes )
 params       - pointer to ASImageExportParams union's member for the
                above type, with additional export parameters, such as
                quality, compression, etc. If NULL then all defaults
                will be used.
 True on success. False - failure.
 ASImage2file will construct filename out of dir and file components
 and then will call specific filter to write out file in requested
 format.
  Some formats support compression, others support lossy compression,
 yet others allows you to limit number of colors and colordepth.
 Each specific filter will try to interpret those parameters in its
 own way.

 asmerge.c: ASMerge.3