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# ASImage Export

functionality for writing images into files

libAfterImage/export.h

- NAME

  export

  - Image output into different file formats.

- SEE ALSO

      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

- AUTHOR

      Sasha Vasko <sasha at aftercode dot net>

libAfterImage/ExportFlags

- NAME

  EXPORT_GRAYSCALE

  - save image as grayscale.

  EXPORT_ALPHA

  - save alpha channel if format permits

  EXPORT_APPEND

  - if format allows multiple images - image will be appended

- FUNCTION

      Some common flags that could be used while writing images into
      different file formats.

- SOURCE

      #define EXPORT_GRAYSCALE            (0x01<<0)
      #define EXPORT_ALPHA                (0x01<<1)
      #define EXPORT_APPEND               (0x01<<3)  /* adds subimage  */
      #define EXPORT_ANIMATION_REPEATS    (0x01<<4)  /* number of loops to repeat GIF animation */
      /*****/

libAfterImage/ASPngExportParams

- NAME

  ASPngExportParams

  - parameters for export into PNG file.

- SOURCE

      typedef struct
      {
          ASImageFileTypes type;
          ASFlagType flags ;
          int compression ;
      }ASPngExportParams ;

libAfterImage/ASJpegExportParams

- NAME

  ASJpegExportParams

  - parameters for export into JPEG file.

- SOURCE

      typedef struct
      {
          ASImageFileTypes type;
          ASFlagType flags ;
          int quality ;
      }ASJpegExportParams ;

libAfterImage/ASGifExportParams

- NAME

  ASGifExportParams

  - parameters for export into GIF file.

- SOURCE

      typedef struct
      {
          ASImageFileTypes type;
          ASFlagType flags ;
          int dither ;
          int opaque_threshold ;
          unsigned short animate_delay ;
          unsigned short animate_repeats ;
      }ASGifExportParams ;

libAfterImage/ASTiffExportParams

- NAME

  ASTiffExportParams

  - parameters for export into TIFF file.

- SOURCE

      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

- NAME

  ASImageExportParams

  - union of structures holding parameters for export into different file formats.

- DESCRIPTION

      Treatment of this union depends on what type of export was requested.

- SEE ALSO

      ASImageFileTypes

- SOURCE

      typedef union ASImageExportParams
      {
          ASImageFileTypes   type;
          ASXpmExportParams  xpm;
          ASPngExportParams  png;
          ASJpegExportParams jpeg;
          ASGifExportParams  gif;
          ASTiffExportParams tiff;
      }ASImageExportParams;

libAfterImage/export/ASImage2file()

- NAME

  ASImage2file()

- SYNOPSIS

      Bool ASImage2file( ASImage *im, const char *dir, const char *file,
                    ASImageFileTypes type, ASImageExportParams *params );

- INPUTS

  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.

- RETURN VALUE

      True on success. False - failure.

- DESCRIPTION

      ASImage2file will construct filename out of dir and file components
      and then will call specific filter to write out file in requested
      format.

- NOTES

      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.

- EXAMPLE

      asmerge.c: ASMerge.3

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