ximage.html

Generated from ximage.h with ROBODoc v3.2.3 on Tue Jan 15 15:07:58 2002

## libAfterImage/ximage.h

SYNOPSIS

     Defines conversion to and from XImages and Pixmaps.

DESCRIPTION

     ximage2asimage()   - convert XImage structure into ASImage
     pixmap2asimage()   - convert X11 pixmap into ASImage
     asimage2ximage()   - convert ASImage into XImage
     asimage2mask_ximage() - convert alpha channel of ASImage into XImage
     asimage2pixmap()   - convert ASImage into Pixmap ( possibly using
                          precreated XImage )
     asimage2mask()     - convert alpha channel of ASImage into 1 bit
                          mask Pixmap.

SEE ALSO

     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/ximage/ximage2asimage()

SYNOPSIS

     ASImage *ximage2asimage ( struct ASVisual *asv, XImage * xim,
                               unsigned int compression );

INPUTS

     asv         - pointer to valid ASVisual structure
     xim         - source XImage
     compression - degree of compression of resulting ASImage.

RETURN VALUE

     pointer to newly allocated ASImage, containing encoded data, on
     success. NULL on failure.

DESCRIPTION

     ximage2asimage will attempt to create new ASImage with the same
     dimensions as supplied XImage. XImage will be decoded based on
     supplied ASVisual, and resulting scanlines will be encoded into
     ASImage.

## libAfterImage/ximage/pixmap2asimage()

SYNOPSIS

     ASImage *pixmap2asimage ( struct ASVisual *asv, Pixmap p,
                               int x, int y,
                               unsigned int width,
                               unsigned int height,
                               unsigned long plane_mask,
                               Bool keep_cache,
                               unsigned int compression );

INPUTS

     asv          - pointer to valid ASVisual structure
     p            - source Pixmap
     x, y,
     width, height- rectangle on Pixmap to be encoded into ASImage.
     plane_mask   - limits color planes to be copied from Pixmap.
     keep_cache   - indicates if we should keep XImage, used to copy
                    image data from the X server, and attached it to ximage
                    member of resulting ASImage.
     compression  - degree of compression of resulting ASImage.

RETURN VALUE

     pointer to newly allocated ASImage, containing encoded data, on
     success. NULL on failure.

DESCRIPTION

     pixmap2asimage will obtain XImage of the requested area of the
     X Pixmap, and will encode it into ASImage using ximage2asimage()
     function.

## libAfterImage/ximage/asimage2ximage()

SYNOPSIS

     XImage  *asimage2ximage  (struct ASVisual *asv, ASImage *im);

INPUTS

     asv        - pointer to valid ASVisual structure
     im         - source ASImage

RETURN VALUE

     On success returns newly created and encoded XImage of the same
     colordepth as the supplied ASVisual. NULL on failure.

DESCRIPTION

     asimage2ximage() creates new XImage of the exact same size as
     supplied ASImage, and depth of supplied ASVisual. REd, Green and
     Blue channels of ASImage then gets decoded, and encoded into XImage.
     Missing scanlines get filled with black color.

NOTES

     Returned pointer to XImage will also be stored in im->alt.ximage,
     and It will be destroyed when XImage is destroyed, or reused in any
     subsequent calls to asimage2ximage(). If any other behaviour is
     desired - make sure you set im->alt.ximage to NULL, to dissociate
     XImage object from ASImage.

SEE ALSO

     create_visual_ximage()

## libAfterImage/ximage/asimage2mask_ximage()

SYNOPSIS

     XImage  *asimage2mask_ximage (struct ASVisual *asv, ASImage *im);

INPUTS

     asv        - pointer to valid ASVisual structure
     im         - source ASImage

RETURN VALUE

     On success returns newly created and encoded XImage of the depth 1.
     NULL on failure.

DESCRIPTION

     asimage2mask_ximage() creates new XImage of the exact same size as
     supplied ASImage, and depth 1. Alpha channels of ASImage then gets
     decoded, and encoded into XImage. If alpha channel is greater the
     127 it is encoded as 1, otherwise as 0.
     Missing scanlines get filled with 1s as they signify absence of mask.

NOTES

     Returned pointer to XImage will also be stored in im->alt.mask_ximage,
     and It will be destroyed when XImage is destroyed, or reused in any
     subsequent calls to asimage2mask_ximage(). If any other behaviour is
     desired - make sure you set im->alt.mask_ximage to NULL, to dissociate
     XImage object from ASImage.

## libAfterImage/ximage/asimage2pixmap()

SYNOPSIS

     Bool    asimage2drawable( struct ASVisual *asv, Drawable d, ASImage *im,
                             GC gc,
                               int src_x, int src_y, int dest_x, int dest_y,
                           unsigned int width, unsigned int height,
                               Bool use_cached);

INPUTS

     asv        - pointer to valid ASVisual structure
     d              - destination drawable - Pixmap or Window
     im         - source ASImage
     gc         - precreated GC to use for XImage transfer. If NULL,
                  asimage2drawable() will use DefaultGC.
     src_x        - Specifies the offset in X from the left edge of the image
                    defined by the ASImage structure.
     src_y        - Specifies the offset in Y from the top edge of the image
                    defined by the ASImage structure.
     dest_x,dest_y- Specify the x and y coordinates, which are relative to
                    the origin of the drawable and are the coordinates of
                    the subimage.
     width,height - Specify the width and height of the subimage, which
                    define the dimensions of the rectangle.
     use_cached - If True will make asimage2pixmap() to use XImage
                  attached to ASImage, instead of creating new one. Only
                  works if ASImage->ximage data member is not NULL.

RETURN VALUE

     On success returns True.

DESCRIPTION

     asimage2drawable() creates will copy portion of ASImage onto the X
     Drawable. It checks if it needs to encode XImage
     from ASImage data, and calls asimage2ximage() if yes, it has to.
     It then supplied gc or DefaultGC of the screen to transfer
     XImage to the server.
     Missing scanlines get filled with black color.

SEE ALSO

     asimage2ximage()
     asimage2pixmap()
     create_visual_pixmap()

## libAfterImage/ximage/asimage2pixmap()

SYNOPSIS

     Pixmap   asimage2pixmap  ( struct ASVisual *asv, Window root,
                                ASImage *im, GC gc, Bool use_cached);

INPUTS

     asv        - pointer to valid ASVisual structure
     root       - root window of destination screen
     im         - source ASImage
     gc         - precreated GC to use for XImage transfer. If NULL,
                  asimage2pixmap() will use DefaultGC.
     use_cached - If True will make asimage2pixmap() to use XImage
                  attached to ASImage, instead of creating new one. Only
                  works if ASImage->ximage data member is not NULL.

RETURN VALUE

     On success returns newly pixmap of the same colordepth as ASVisual.
     None on failure.

DESCRIPTION

     asimage2pixmap() creates new pixmap of exactly same size as
     supplied ASImage. It then calls asimage2drawable to copy entire content
     of the ASImage onto that created pixmap.

EXAMPLE

     asview.c: ASView.5

SEE ALSO

     asimage2ximage()
     asimage2drawable()
     create_visual_pixmap()

## libAfterImage/ximage/asimage2mask()

SYNOPSIS

     Pixmap   asimage2mask ( struct ASVisual *asv, Window root,
                             ASImage *im, GC gc, Bool use_cached);
     asv        - pointer to valid ASVisual structure
     root       - root window of destination screen
     im         - source ASImage
     gc         - precreated GC for 1 bit deep drawables to use for
                  XImage transfer. If NULL, asimage2mask() will create one.
     use_cached - If True will make asimage2mask() to use mask XImage
                attached to ASImage, instead of creating new one. Only
                works if ASImage->alt.mask_ximage data member is not NULL.

RETURN VALUE

     On success returns newly created pixmap of the colordepth 1.
     None on failure.

DESCRIPTION

     asimage2mask() creates new pixmap of exactly same size as
     supplied ASImage. It then calls asimage2mask_ximage().
     It then uses supplied gc, or creates new gc, to transfer
     XImage to the server and put it on Pixmap.
     Missing scanlines get filled with 1s.

SEE ALSO

     asimage2mask_ximage()