Skeleton implementation of new themes API, complete with documentation, for discussion purposes.

svn path=/trunk/netsurf/; revision=3021

utils/themes.c

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+/*
+ * This file is part of NetSurf, http://netsurf.sourceforge.net/
+ * Licensed under the GNU General Public License,
+ *                http://www.opensource.org/licenses/gpl-license
+ * Copyright 2006 Rob Kendrick <rjek@rjek.com>
+ */
+
+#include "netsurf/utils/themes.h"
+
+struct theme_descriptor;
+
+/** 
+ * Initialise the themes interface.  This must be called once only before any
+ * other themes_ functions are called.  It will enumerate all the themes
+ * found in the directory path names passed.  Further themes can be added at
+ * runtime by using themes_add_new().
+ *
+ * \param directories An array of directory path names that will be scanned
+ *                    in turn to find installed themes.  Earlier directories
+ *                    take precedence over ones mentioned later.
+ */
+void themes_initialise(const unsigned char *directories[])
+{
+
+}
+
+/**
+ * Close the themes system, freeing any open themes, and destroying any
+ * associated bitmaps that have been created from it.
+ */
+void themes_finalise(void)
+{
+
+}
+
+/**
+ * Add a new theme to the themes system.  This is primarily of use to let
+ * NetSurf know about themes that were installed after NetSurf started - for
+ * example, from the "Install Theme" user interface.
+ *
+ * \param filename The filename, including full directory path, to the new
+ *                 theme.  This theme will superceed any previous theme
+ *                 that has the same theme name.
+ */
+void themes_add_new(const unsigned char *filename);
+
+/**
+ * Open a theme for use.  This increases the theme's use-count.
+ *
+ * \param themename Name of the theme to open.  This is just the theme
+ *                  name, not the file name.
+ * \return struct theme_descriptor for use with other calls when refering to
+ *         this theme.  NULL if the theme is unknown to the theme system.
+ */
+struct theme_descriptor *themes_open(const unsigned char *themename)
+{
+
+}
+
+/**
+ * Decreases a theme's usage count, freeing memory assoicated with it should
+ * it reach zero.  This will also destroy any bitmaps that have been created
+ * from it.
+ *
+ * \param theme Theme that the caller is finished with.
+ */     
+void themes_close(struct theme_descriptor *theme)
+{
+
+}
+
+/**
+ * Enumerate known themes
+ * \param ctx Set to NULL for initial call.  It will be updated after each call
+ *            to point to the next result.
+ * \return struct theme_descriptor for use with other calls, or NULL if there
+ *         are no more themes known.  Note that this does not increase the
+ *         theme's usage count - you should call themes_open() with the result
+ *         of themes_get_name() if you wish to use this theme.
+ */
+struct theme_descriptor *themes_enumerate(void **ctx)
+{
+
+}
+
+/**
+ * Return a NetSurf bitmap structure for an image stored within the theme
+ * container.  Note that this bitmap will become invalid if the theme's usage
+ * count reaches zero due to calls to themes_close()
+ *
+ * \param theme The theme you wish to retrieve an image from.  If this is NULL,
+ *        the default theme, as set by themes_set_default(), will be used.
+ * \param name  The name of the image within the theme you wish to retrieve.
+ * \return struct bitmap containing the decoded image.
+ */
+struct bitmap *theme_get_image(struct theme_descriptor *theme,
+				const unsigned char *name)
+{
+
+}
+
+/**
+ * Set the default theme to use.  This calls themes_open() to increase the
+ * theme's usage count.  It will also call themes_close() on the previous
+ * default, if there was one.
+ *
+ * \param themename The name of the theme to set as the new default.
+ */
+void themes_set_default(const unsigned char *themename)
+{
+
+}
+
+/**
+ * Return the name of a theme from a struct theme_descriptor.
+ *
+ * \param theme The theme whose name to return
+ * \return Name of theme
+ */
+const unsigned char *themes_get_name(struct theme_descriptor *theme)
+{
+
+}
+
+/**
+ * Return the author of a theme from a struct theme_descriptor.
+ *
+ * \param theme The theme whose author to return
+ * \return Author of the theme.
+ */
+const unsigned char *themes_get_author(struct theme_descriptor *theme)
+{
+
+}

utils/themes.h

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+/*
+ * This file is part of NetSurf, http://netsurf.sourceforge.net/
+ * Licensed under the GNU General Public License,
+ *                http://www.opensource.org/licenses/gpl-license
+ * Copyright 2006 Rob Kendrick <rjek@rjek.com>
+ */
+ 
+#ifndef __THEMES_H__
+#define __THEMES_H__
+
+#include "netsurf/image/bitmap.h"
+
+struct theme_descriptor;
+
+void themes_initialise(void);
+void themes_finalise(void);
+
+void themes_add_new(const unsigned char *filename);
+
+struct theme_descriptor *themes_open(const unsigned char *themename;
+void themes_close(struct theme_descriptor *theme);
+struct theme_descriptor *themes_enumerate(void **ctx);
+
+struct bitmap *theme_get_image(struct theme_descriptor *theme,
+				const unsigned char *name);
+
+void themes_set_default(const unsigned char *themename);
+
+const unsigned char *themes_get_name(struct theme_descriptor *theme);
+const unsigned char *themes_get_author(struct theme_descriptor *theme);
+
+#endif /* __THEMES_H__ */