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| ASImage Export | functionality for writing images into files |
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
libAfterImage/ASJpegExportParams
NAME
ASJpegExportParams- parameters for export into JPEG file.
SOURCE
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
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
