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# XImage

functionality for displaying ASImages on X display

libAfterImage/ximage.h

- NAME

  ximage

  - 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/picture_ximage2asimage()

- NAME

  picture_ximage2asimage()

- SYNOPSIS

      ASImage *picture_ximage2asimage ( struct ASVisual *asv,
                                        XImage * xim, XImage *alpha_xim,
                                        unsigned int compression );

- INPUTS

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

- RETURN VALUE

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

- DESCRIPTION

      picture_ximage2asimage will attempt to create new ASImage with the same
      dimensions as supplied XImage. If both XImages are supplied - they must
      have same dimentions. XImage will be decoded based on
      supplied ASVisual, and resulting scanlines will be encoded into
      ASImage.

libAfterImage/ximage2asimage()

- NAME

  ximage2asimage()

  - same as picture_ximage2asimage with alpha_ximage set to NULL. Supplied for compatibility with older versions and for convinience.

- 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

libAfterImage/pixmap2asimage()

- NAME

  pixmap2asimage()

- SYNOPSIS

      ASImage *pixmap2ximage( ASVisual *asv, Pixmap p, int x, int y,
                              unsigned int width, unsigned int height,
                                 unsigned long plane_mask,
                              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 data in XImage format,
      on success. NULL on failure.

- DESCRIPTION

      pixmap2ximage will obtain XImage of the requested area of the
      X Pixmap, and it will attach it to newly created ASImage using
      alt.ximage member. After that newly created ASImage could be used
      in any transformations.

libAfterImage/pixmap2asimage()

- NAME

  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

      same as picture2asimage() with alpha pixmap set to None. Supplied for
      compatibility and convinience.

libAfterImage/picture2asimage()

- NAME

  picture2asimage()

- SYNOPSIS

      ASImage *picture2asimage (struct ASVisual *asv,
                                Pixmap rgb, Pixmap a,
                                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
  rgb
    - source Pixmap for red, green and blue channels
  a
    - source Pixmap for the alpha channel
  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

      picture2asimage will obtain XImage of the requested area of the
      X Pixmap, If alpha channel pixmap is supplied - it will be used to
      encode ASImage's alpha channel. Alpha channel pixmap must be either
      8 or 1 bit deep, and it must have the same dimentions as main Pixmap.

libAfterImage/asimage2ximage()

- NAME

  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/asimage2alpha_ximage()

- NAME

  asimage2alpha_ximage()

- SYNOPSIS

      XImage  *asimage2alpha_ximage (struct ASVisual *asv,
                                     ASImage *im, Bool bitmap);

- INPUTS

  asv
    - pointer to valid ASVisual structure
  im
    - source ASImage
  bitmap
    - if True resulting XImage will have depth of 1 bit - traditional X mask; otherwise it will have depth of 8 (usefull for XFree86 RENDER extension)

- RETURN VALUE

      On success returns newly created and encoded XImage of the depth 1 or 8.
      NULL on failure.

- DESCRIPTION

      asimage2alpha_ximage() creates new XImage of the exact same size as
      supplied ASImage, and depth 1 or 8. Alpha channels of ASImage then gets
      decoded, and encoded into XImage. In case requested depth is 1 then
      alpha channel is interpreted like so: 127 or greater 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/asimage2mask_ximage()

- NAME

  asimage2mask_ximage()

  - same as asimage2alpha_ximage(). Supplied for convinience and compatibility with older versions.

- 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.

libAfterImage/asimage2pixmap()

- NAME

  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/asimage2pixmap()

- NAME

  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/asimage2mask()

- NAME

  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()

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