libAfterImage/ximage.h

 Defines conversion to and from XImages and Pixmaps.

 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.

 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/ximage/ximage2asimage()

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

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

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

 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()

 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 );

 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.

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

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

libAfterImage/ximage/asimage2ximage()

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

 asv        - pointer to valid ASVisual structure
 im         - source ASImage

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

 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.

 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.

 create_visual_ximage()

libAfterImage/ximage/asimage2mask_ximage()

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

 asv        - pointer to valid ASVisual structure
 im         - source ASImage

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

 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.

 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()

 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);

 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.

 On success returns True.

 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.

 asimage2ximage()
 asimage2pixmap()
 create_visual_pixmap()

libAfterImage/ximage/asimage2pixmap()

 Pixmap   asimage2pixmap  ( 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 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.

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

 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.

 asview.c: ASView.5

 asimage2ximage()
 asimage2drawable()
 create_visual_pixmap()

libAfterImage/ximage/asimage2mask()

 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.

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

 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.

 asimage2mask_ximage()