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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 (useful 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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