Improved error handling

[clg] / gdk / pixbuf.lisp

;; Common Lisp bindings for GTK+ v2.0
;; Copyright (C) 2004 Espen S. Johnsen <espen@users.sf.net>
;;
;; This library is free software; you can redistribute it and/or
;; modify it under the terms of the GNU Lesser General Public
;; License as published by the Free Software Foundation; either
;; version 2 of the License, or (at your option) any later version.
;;
;; This library 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
;; Lesser General Public License for more details.
;;
;; You should have received a copy of the GNU Lesser General Public
;; License along with this library; if not, write to the Free Software
;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

;; $Id: pixbuf.lisp,v 1.2 2005-02-14 00:46:31 espen Exp $


(in-package "GDK")

(defbinding pixbuf-get-option () (copy-of string)
  (pixbuf pixbuf)
  (key string))

(defbinding %pixbuf-new-from-file () (referenced pixbuf)
  (filename pathname)
  (nil gerror :out))

(defbinding %pixbuf-new-from-file-at-size () (referenced pixbuf)
  (filename pathname)
  (width int)
  (height int)
  (nil gerror :out))

#+gtk2.6
(defbinding %pixbuf-new-from-file-at-scale () (referenced pixbuf)
  (filename pathname)
  (width int)
  (height int)
  (preserve-aspect-ratio boolean)
  (nil gerror :out))

(defun pixbuf-load (filename &key width height size (preserve-aspect-ratio t))
  #-gtk2.6
  (unless preserve-aspect-ratio 
    (warn ":preserve-aspect-ratio not supported with this version of Gtk"))

  (multiple-value-bind (pixbuf gerror)
      (cond
       (size 
	#-gtk2.6(%pixbuf-new-from-file-at-size filename size size)
	#+gtk2.6(%pixbuf-new-from-file-at-scale filename size size preserve-aspect-ratio))
       ((and width height)
	#-gtk2.6(%pixbuf-new-from-file-at-size filename width height)
	#+gtk2.6(%pixbuf-new-from-file-at-scale filename width height preserve-aspect-ratio))
       ((or width height)
	(error "Both :width and :height must be specified"))
       (t (%pixbuf-new-from-file filename)))
    (if gerror
	(signal-gerror gerror)
      pixbuf)))


;; (defbinding pixbuf-get-file-info () (copy-of pixbuf-format)
;;   (filename pathname)
;;   (width int :out)
;;   (height int :out))

(defbinding %pixbuf-savev () boolean
  (pixbuf pixbuf)
  (filename pathname)
  (type string)
  (keys strings)
  (values string)
  (nil gerror :out))

(defun pixbuf-save (pixbuf filename type &rest options)
  (let ((keys (make-array 0 :adjustable t :fill-pointer t))
	(values (make-array 0 :adjustable t :fill-pointer t)))
    (loop 
     as (key value . rest) = options then rest
     do (vector-push-extend (string-downcase key) keys)
        (vector-push-extend 
	 (etypecase value 
	   (string value)
	   (symbol (string-downcase value))
	   (number (format nil "~A" value)))
	 values))
    (multiple-value-bind (ok-p gerror)
	(%pixbuf-savev pixbuf filename type keys values)
      (unless ok-p
	(signal-gerror gerror)))))

(defbinding pixbuf-new-from-xpm-data () (referenced pixbuf)
  (data (vector string)))

(defbinding %pixbuf-new-subpixbuf () pixbuf ;; or (referenced pixbuf)?
  (pixbuf pixbuf)
  (x int) (y int) (width int) (height int))

(defbinding %pixbuf-copy () (referenced pixbuf)
  (pixbuf pixbuf))

(defun copy-pixbuf (pixbuf &optional x y width height)
  (if (and (not x) (not y) (not width) (not height))
      (%pixbuf-copy pixbuf)
    (%pixbuf-new-subpixbuf pixbuf x y width height)))


;;; Utilities

(defbinding pixbuf-add-alpha 
    (pixbuf &optional substitute-color (red 255) (green 255) (blue 255))
    (referenced pixbuf)
  (pixbuf pixbuf)
  (substitute-color boolean)
  (red (unsigned 8))
  (green (unsigned 8))
  (blue (unsigned 8)))