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;;; image.skb -- Images.
;;; -*- coding: iso-8859-1 -*-
;;;
;;; Copyright 2008 Ludovic Courtès <ludo@gnu.org>
;;; Copyright 2003, 2004 Manuel Serrano
;;;
;;;
;;; This file is part of Skribilo.
;;;
;;; Skribilo is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation, either version 3 of the License, or
;;; (at your option) any later version.
;;;
;;; Skribilo is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Skribilo. If not, see <http://www.gnu.org/licenses/>.
;*---------------------------------------------------------------------*/
;* Image ... @label image@ */
;*---------------------------------------------------------------------*/
(section :title "Images" :file #t
(p [Images are defined by the means of the ,(code "image") function])
(doc-markup 'image
`((:file ,[The file where the image is stored on the disk
(see ,(ref :mark "*image-path*"
:text "image path")).
The image is converted
(see ,(markup-ref "convert-image")) into a format
supported by the engine. This option is exclusive
with the ,(param :url) option.])
(:url [The URL of the file. This option is exclusive with the
,(param :file) option.])
(:width [The width of the image. It may be an integer for a pixel
size or a floating point number for a percentage.])
(:height [The height of the image. It may be an integer for a
pixel size or a floating point number for a
percentage.])
(:zoom [A zoom factor.])
(#!rest comment [A text describing the image.]))
:see-also '(*image-path* convert-image))
(example-produce
(example :legend "The image markup" (prgm :file "src/api16.skb"))
(disp (include "src/api16.skb")))
(mark "*image-path*")
(p [Files passed as a ,(tt [:file]) argument to ,(markup-ref "image")
are searched in the current ,(emph [image path]), which is defined by
the ,(tt [*image-path*]) ,(srfi-ref 39) parameter. This parameter
contains a list of directories and its value can be obtained using
,(code [(*image-path*)]). Its value can be altered using the ,(tt [-P])
command-line option of the ,(tt [skribilo]) compiler (see ,(numref :text
[Chapter] :ident "compiler") for details).])
;*--- Image format ----------------------------------------------------*/
(subsection :title "Image formats"
(index "image" :note "conversion")
(p [
Images are unfortunately ,(emph "unportable"). The various Skribe output
formats support different image formats. For instance, HTML supports
,(code "gif") and ,(code "jpeg") while the LaTeX back-end only supports
,(code "ps"). Skribe tries, only when needed, to automatically
,(emph "convert") images to a format supported by the target
to be produced. For this, it uses external tools. The default Skribe
translation scheme is:])
(itemize (item [Do not translate an image that needs no conversion.])
(item [Uses the ,(code "fig2dev") external tool to translate
,(code "Xfig") images.])
(item [Uses the ,(code "convert") external tools to translate all
other formats.]))
(p [,(ref :chapter "Engines" :text "Engines") support different image
formats. Each engine may specify a converter to be applied to an image.
The engine custom ,(code "image-format") specifies the list of supported
image formats. This list is composed of a suffix such as ,(code "jpeg") or
,(code "gif").])
(p [The function ,(code "convert-image") tries to convert an
image according to a list of formats. All the specified formats are
successively tried. On the first success, the function ,(code "convert-image")
returns the name of the new converted image. On failure, it returns
,(code "#f").])
(doc-markup 'convert-image
`((file [The image file to be converted. The file is
searched in the ,(ref :mark "*image-path*" :text "image path").])
(formats [A list of formats into which images are converted to.]))
:common-args '()
:skribe-source? #f
:source #f ;;"skribilo/runtime.scm"
:def '(define-markup (convert-image file formats) ...)
:see-also '(*image-path*)
:idx *function-index*)))
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