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AFTERImage XML tags

XML schema to be used for scripting image manipulation by AfterStep and ascompose

libAfterImage/asimagexml

NAME
ascompose
is a tool to compose image(s) and display/save it based on supplied XML input file.

DESCRIPTION

ascompose reads supplied XML data, and manipulates image accordingly.
It could transform images from files of any supported file format,
draw gradients, render antialiased texturized text, perform
superimposition of arbitrary number of images, and save images into
files of any of supported output file formats.

At any point, the result of any operation could be assigned a name,
and later on referenced under this name.

At any point during the script processing, result of any operation
could be saved into a file of any supported file types.

Internal image format is 32bit ARGB with 8bit per channel.

Last image referenced, will be displayed in X window, unless -n option
is specified. If -r option is specified, then this image will be
displayed in root window of X display, effectively setting a background
for a desktop. If -o option is specified, this image will also be
saved into the file or requested type.

TAGS

Here is the list and description of possible XML tags to use in the
script :
    img       - load image from the file.
    recall    - recall previously loaded/generated image by its name.
    text      - render text string into new image.
    save      - save an image into the file.
    bevel     - draw solid bevel frame around the image.
    gradient  - render multipoint gradient.
    mirror    - create mirror copy of an image.
    blur      - perform gaussian blur on an image.
    rotate    - rotate/flip image in 90 degree increments.
    scale     - scale an image to arbitrary size.
    slice     - enlarge image to arbitrary size leaving corners unchanged.
    crop      - crop an image to arbitrary size.
    tile      - tile an image to arbitrary size.
    hsv       - adjust Hue, Saturation and Value of an image.
    pad       - pad image with solid color from either or all sides.
    solid     - generate new image of requested size, filled with solid
             color.
    composite - superimpose arbitrary number of images using one of 15
             available methods.
 if        - conditional processing based on value of the variables
 set       - sets value of the variable
 printf    - formated printing of the value of the variable

Each tag generates new image as the result of the transformation -
existing images are never modified and could be reused as many times
as needed. See below for description of each tag.

Whenever numerical values are involved, the basic math ops (add,
subtract, multiply, divide), unary minus, and parentheses are
supported.

Operator precedence is NOT supported.  Percentages are allowed, and
apply to either width or height of the appropriate image (usually
the refid image).

Also, variables of the form $image.width and $image.height are
supported.  $image.width is the width of the image with refid "image",
and $image.height is the height of the same image.  The special
$xroot.width and $xroot.height values are defined by the the X root
window, if there is one.  This allows images to be scaled to the
desktop size: <scale width="$xroot.width" height="$xroot.height">.

Each tag is only allowed to return ONE image.

libAfterImage/asimagexml/text

NAME
text
- render text string into new image, using specific font, size and texture.

SYNOPSIS

<text id="new_id" font="font" point="size" fgcolor="color"
      bgcolor="color" fgimage="image_id" bgimage="image_id"
      spacing="points" type="3dtype">My Text Here</text>

ATTRIBUTES
id
Optional. Image will be given this name for future reference.
font
Optional. Default is "fixed". Font to use for text.
point
Optional. Default is 12. Size of text in points.
fgcolor
Optional. No default. The text will be drawn in this color.
bgcolor
Optional. No default. The area behind the text will be drawn in this color.
fgimage
Optional. No default. The text will be textured by this image.
bgimage
Optional. No default. The area behind the text will be filled with this image.
spacing
Optional. Default 0. Extra pixels to place between each glyph.
type
Optional. Default 0. Valid values are from 0 to 7 and each represeend different 3d type.

NOTES

<text> without bgcolor, fgcolor, fgimage, or bgimage will NOT
produce visible output by itself.  See EXAMPLES below.

libAfterImage/asimagexml/composite

NAME
composite
- superimpose arbitrary number of images on top of each other.

SYNOPSIS

<composite id="new_id" op="op_desc"
           keep-transparency="0|1" merge="0|1">

ATTRIBUTES
id
Optional. Image will be given this name for future reference.
op
Optional. Default is "alphablend". The compositing operation. Valid values are the standard AS blending ops: add, alphablend, allanon, colorize, darken, diff, dissipate, hue, lighten, overlay, saturate, screen, sub, tint, value.
merge
Optional. Default is "expand". Valid values are "clip" and "expand". Determines whether final image will be expanded to the maximum size of the layers, or clipped to the bottom layer.
keep-transparency
Optional. Default is "0". Valid values are "0" and "1". If set to "1", the transparency of the bottom layer will be kept for the final image.

NOTES

All images surrounded by this tag will be composited with the given op.

ATTRIBUTES
```
 All tags surrounded by this tag may have some of the common attributes
 in addition to their normal ones.  Under no circumstances is there a 
 conflict with the normal child attributes:
```
crefid
Optional. An image ID defined with the "id" parameter for any previously created image. If set, percentages in "x" and "y" will be derived from the width and height of the crefid image.
x
Optional. Default is 0. Pixel coordinate of left edge.
y
Optional. Default is 0. Pixel coordinate of top edge.
align
Optional. Alternative to x - allowed values are right, center and left.
valign
Optional. Alternative to y - allowed values are top, middle and bottom.
clip_x
Optional. Default is 0. X Offset on infinite surface tiled with this image, from which to cut portion of an image to be used in composition.
clip_y
Optional. Default is 0. Y Offset on infinite surface tiled with this image, from which to cut portion of an image to be used in composition.
clip_width
Optional. Default is image width. Tile image to this width prior to superimposition.
clip_height
Optional. Default is image height. Tile image to this height prior to superimposition.
tile
Optional. Default is 0. If set will cause image to be tiled across entire composition, unless overridden by clip_width or clip_height.
tint
Optional. Additionally tint an image to specified color. Tinting can both lighten and darken an image. Tinting color 0 or #7f7f7f7f yields no tinting. Tinting can be performed on any channel, including alpha channel.
SEE ALSO
```
libAfterImage
```

libAfterImage/asimagexml/img

NAME
img
- load image from the file.
SYNOPSIS
```
<img id="new_img_id" src="filename"/>
```
ATTRIBUTES
id
Optional. Image will be given this name for future reference.
src
Required. The filename (NOT URL) of the image file to load.

NOTES

The special image src "xroot:" will import the background image
of the root X window, if any.  No attempt will be made to offset this
image to fit the location of the resulting window, if one is displayed.

libAfterImage/asimagexml/recall

NAME
recall
- recall previously generated and named image by its id.

SYNOPSIS

<recall id="new_id" srcid="image_id" default_src="filename"/>

ATTRIBUTES
id
Optional. Image will be given this name for future reference.
srcid
Required. An image ID defined with the "id" parameter for any previously created image.

libAfterImage/asimagexml/release

NAME
release
- release (destroy if possible) previously generated and named image by its id.
SYNOPSIS
```
<release srcid="image_id"/>
```
ATTRIBUTES
srcid
Required. An image ID defined with the "id" parameter for any previously created image.

libAfterImage/asimagexml/color

NAME
color
- defines symbolic name for a color and set of variables.

SYNOPSIS

<color name="sym_name" domain="var_domain" argb="colorvalue"/>

ATTRIBUTES
name
Symbolic name for the color value, to be used to refer to that color.
argb
8 characters hex definition of the color or other symbolic color name.
domain
string to be used to prepend names of defined variables.

NOTES

In addition to defining symbolic name for the color this tag will define
7 other variables :     domain.sym_name.red, domain.sym_name.green, 
                        domain.sym_name.blue, domain.sym_name.alpha, 
                        domain.sym_name.hue, domain.sym_name.saturation,
                        domain.sym_name.value

libAfterImage/asimagexml/color2alpha

NAME
color2alpha
- set alpha channel based on color closeness to specified color

SYNOPSIS

<color2alpha id="new_id" ref_id="other_imag" width="pixels" height="pixels"
       clip_x="clip_x" clip_y="clip_y"
       color="color">

ATTRIBUTES
id
Optional. Image will be given this name for future reference.
refid
Optional. An image ID defined with the "id" parameter for any previously created image. If set, percentages in "width" and "height" will be derived from the width and height of the refid image.
width
Required. The image will be scaled to this width.
height
Required. The image will be scaled to this height.
clip_x
Optional. Offset into original image.
clip_y
Optional. Offset into original image.
color
Required. Color to match against.

NOTES

This tag applies to the first image contained within the tag.  Any
further images will be discarded.
If you want to keep image proportions while resizing-use "proportional"
instead of specific size for particular dimention.

libAfterImage/asimagexml/printf

NAME
printf
- prints variable value to standard output.

SYNOPSIS

<printf format="format_string" var="variable_name" val="expression"/>

ATTRIBUTES
format_string
Standard C format string with exactly 1 placeholder.
var
Name of the variable, which value will be printed.
val
math expression to be printed.
NOTES

libAfterImage/asimagexml/set

NAME
set
- declares variable, assigning it a numeric value of expression.

SYNOPSIS

<set var="variable_name" domain="var_domain" val="expression"/>

ATTRIBUTES
var
Name of the variable, which value will be set.
val
math expression to be evaluated.
domain
(optional) variable's domain to be prepended to its name using format var_domain.variable_name

libAfterImage/asimagexml/if

NAME
if
- evaluates logical expression and if result evaluates to not true(or false if <unless> tag is used ), handles tags within.

SYNOPSIS

<if val1="expression" [op="gt|lt|ge|le|eq|ne" val2="expression"]/>
    [<then>...</then><else>...</else>]
</if>
<unless val1="expression" [op="gt|lt|ge|le|eq|ne" val2="expression"]/>

ATTRIBUTES
val1
math expression to be evaluated.
val2
math expression to be evaluated.
op
(optional) comparison op to be applied to values

EXAMPLE

<if val1="$ascs.Base.value" val2="50" op="gt"><then>...</then><else>...</else></if>

libAfterImage/asimagexml/gradient

NAME
gradient
- render multipoint gradient.

SYNOPSIS

<gradient id="new_id" angle="degrees" 
          refid="refid" width="pixels" height="pixels"
          colors ="color1 color2 color3 [...]"
          offsets="fraction1 fraction2 fraction3 [...]"/>

ATTRIBUTES
id
Optional. Image will be given this name for future reference.
refid
Optional. An image ID defined with the "id" parameter for any previously created image. If set, percentages in "width" and "height" will be derived from the width and height of the refid image.
width
Optional. The result will have this width.
height
Optional. The result will have this height.
colors
Required. Whitespace-separated list of colors. At least two colors are required. Each color in this list will be visited in turn, at the intervals given by the offsets attribute.
offsets
Optional. Whitespace-separated list of floating point values ranging from 0.0 to 1.0. The colors from the colors attribute are given these offsets, and the final gradient is rendered from the combination of the two. If both colors and offsets are given but the number of colors and offsets do not match, the minimum of the two will be used, and the other will be truncated to match. If offsets are not given, a smooth stepping from 0.0 to 1.0 will be used.
angle
Optional. Given in degrees. Default is 0. This is the direction of the gradient. Currently the only supported values are 0, 45, 90, 135, 180, 225, 270, 315. 0 means left to right, 90 means top to bottom, etc.

libAfterImage/asimagexml/solid

NAME
solid
- generate image of specified size and fill it with solid color.

SYNOPSIS

<solid id="new_id" color="color" opacity="opacity" 
    width="pixels" height="pixels"
    refid="refid" width="pixels" height="pixels"/>

ATTRIBUTES
id
Optional. Image will be given this name for future reference.
width
Optional. The result will have this width.
height
Optional. The result will have this height.
refid
Optional. An image ID defined with the "id" parameter for any previously created image. If set, percentages in "width" and "height" will be derived from the width and height of the refid image.
color
Optional. Default is "#ffffffff". An image will be created and filled with this color.
width
Required. The image will have this width.
height
Required. The image will have this height.
opacity
Optional. Default is 100. Values from 0 to 100 represent the opacity of resulting image with 100 being completely opaque. Effectively overrides alpha component of the color setting.

libAfterImage/asimagexml/save

NAME
save
- write generated/loaded image into the file of one of the supported types

SYNOPSIS

<save id="new_id" dst="filename" format="format" compress="value"
      opacity="value" replace="0|1" delay="mlsecs">

ATTRIBUTES
id
Optional. Image will be given this name for future reference.
dst
Optional. Name of file image will be saved to. If omitted image will be dumped into stdout - useful for CGI apps.
format
Optional. Ouput format of saved image. Defaults to the extension of the "dst" parameter. Valid values are the standard AS image file formats: xpm, jpg, png, gif, tiff.
compress
Optional. Compression level if supported by output file format. Valid values are in range of 0 - 100 and any of "deflate", "jpeg", "ojpeg", "packbits" for TIFF files. Note that JPEG and GIF will produce images with deteriorated quality when compress is greater then 0. For JPEG default is 25, for PNG default is 6 and for GIF it is 0.
opacity
Optional. Level below which pixel is considered to be transparent, while saving image as XPM or GIF. Valid values are in range 0-255. Default is 127.
replace
Optional. Causes ascompose to delete file if the file with the same name already exists. Valid values are 0 and 1. Default is 1 - files are deleted before being saved. Disable this to get multimage animated gifs.
delay
Optional. Delay to be stored in GIF image. This could be used to create animated gifs. Note that you have to set replace="0" and then write several images into the GIF file with the same name.

NOTES

This tag applies to the first image contained within the tag.  Any
further images will be discarded.

libAfterImage/asimagexml/background

NAME
background
- set image's background color.

SYNOPSIS

 <background id="new_id" color="color">

ATTRIBUTES
id
Optional. Image will be given this name for future reference.
color
Required. Color to be used for background - fills all the spaces in image with missing pixels.

NOTES

This tag applies to the first image contained within the tag.  Any
further images will be discarded.

libAfterImage/asimagexml/blur

NAME
blur
- perform a gaussian blurr on an image.

SYNOPSIS

<blur id="new_id" horz="radius" vert="radius" channels="argb">

ATTRIBUTES
id
Optional. Image will be given this name for future reference.
horz
Optional. Horizontal radius of the blur in pixels.
vert
Optional. Vertical radius of the blur in pixels.
channels
Optional. Applys blur only on listed color channels: a - alpha, r - red, g - green, b - blue

NOTES

This tag applies to the first image contained within the tag.  Any
further images will be discarded.

libAfterImage/asimagexml/bevel

NAME
bevel
- draws solid bevel frame around the image.

SYNOPSIS

<bevel id="new_id" colors="color1 color2" 
          width="pixels" height="pixels" refid="refid"
       border="left top right bottom" solid=0|1 outline=0|1>

ATTRIBUTES
id
Optional. Image will be given this name for future reference.
colors
Optional. Whitespace-separated list of colors. Exactly two colors are required. Default is "#ffdddddd #ff555555". The first color is the color of the upper and left edges, and the second is the color of the lower and right edges.
borders
Optional. Whitespace-separated list of integer values. Default is "10 10 10 10". The values represent the offsets toward the center of the image of each border: left, top, right, bottom.
solid
Optional - default is 1. If set to 0 will draw bevel gradually fading into the image.
outline
Optional - default is 0. If set to 1 will draw bevel around the image vs. inside the image.
width
Optional. The result will have this width.
height
Optional. The result will have this height.
refid
Optional. An image ID defined with the "id" parameter for any previously created image. If set, percentages in "width" and "height" will be derived from the width and height of the refid image.

NOTES

This tag applies to the first image contained within the tag.  Any
further images will be discarded.

libAfterImage/asimagexml/mirror

NAME
mirror
- create new image as mirror copy of an old one.

SYNOPSIS

 <mirror id="new_id" dir="direction" 
            width="pixels" height="pixels" refid="refid">

ATTRIBUTES
id
Optional. Image will be given this name for future reference.
dir
Required. Possible values are "vertical" and "horizontal". The image will be flipped over the x-axis if dir is vertical, and flipped over the y-axis if dir is horizontal.
width
Optional. The result will have this width.
height
Optional. The result will have this height.
refid
Optional. An image ID defined with the "id" parameter for any previously created image. If set, percentages in "width" and "height" will be derived from the width and height of the refid image.

NOTES

This tag applies to the first image contained within the tag.  Any
further images will be discarded.

libAfterImage/asimagexml/rotate

NAME
rotate
- rotate an image in 90 degree increments (flip).

SYNOPSIS

 <rotate id="new_id" angle="degrees"
            width="pixels" height="pixels" refid="refid">
* ATTRIBUTES
id       Optional. Image will be given this name for future reference.
angle    Required.  Given in degrees.  Possible values are currently
         "90", "180", and "270".  Rotates the image through the given
         angle.
width    Optional.  The result will have this width.
height   Optional.  The result will have this height.
refid    Optional.  An image ID defined with the "id" parameter for
         any previously created image.  If set, percentages in "width"
         and "height" will be derived from the width and height of the
         refid image.

NOTES

This tag applies to the first image contained within the tag.  Any
further images will be discarded.

libAfterImage/asimagexml/scale

NAME
scale
- scale image to arbitrary size

SYNOPSIS

<scale id="new_id" refid="other_imag" src_x="pixels"  src_y="pixels" 
       src_width="pixels" src_height="pixels" 
       width="pixels" height="pixels">

ATTRIBUTES
id
Optional. Image will be given this name for future reference.
refid
Optional. An image ID defined with the "id" parameter for any previously created image. If set, percentages in "width" and "height" will be derived from the width and height of the refid image.
width
Required. The image will be scaled to this width.
height
Required. The image will be scaled to this height.
src_x
Optional. Default is 0. X Offset on infinite surface tiled with this image, from which to cut portion of an image to be used in scaling.
src_y
Optional. Default is 0. Y Offset on infinite surface tiled with this image, from which to cut portion of an image to be used in scaling.
src_width
Optional. Default is image width. Tile image to this width prior to scaling.
src_height
Optional. Default is image height. Tile image to this height prior to scaling.
*
NOTES
This
tag applies to the first image contained within the tag. Any
further
images will be discarded.
If
you want to keep image proportions while scaling - use "proportional"
instead
of specific size for particular dimention.

libAfterImage/asimagexml/slice

NAME
slice
- slice image to arbitrary size leaving corners unchanged

SYNOPSIS

<slice id="new_id" ref_id="other_imag" width="pixels" height="pixels"
       x_start="slice_x_start" x_end="slice_x_end"
          y_start="slice_y_start" y_end="slice_y_end"
          scale="0|1">

ATTRIBUTES
id
Optional. Image will be given this name for future reference.
refid
Optional. An image ID defined with the "id" parameter for any previously created image. If set, percentages in "width" and "height" will be derived from the width and height of the refid image.
width
Required. The image will be scaled to this width.
height
Required. The image will be scaled to this height.
x_start
Optional. Position at which vertical image slicing begins. Corresponds to the right side of the left corners.
x_end
Optional. Position at which vertical image slicing end. Corresponds to the left side of the right corners.
y_start
Optional. Position at which horisontal image slicing begins. Corresponds to the bottom side of the top corners.
y_end
Optional. Position at which horisontal image slicing end. Corresponds to the top side of the bottom corners.
scale
Optional. If set to 1 will cause middle portion of the image to be scaled instead of tiled.

NOTES

This tag applies to the first image contained within the tag.  Any
further images will be discarded.
Contents of the image between x_start and x_end will be tiled 
horizontally. Contents of the image between y_start and y_end will be 
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