source: trunk/third/librsvg/rsvg-private.h @ 20920

/* vim: set sw=4: -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/*
   rsvg-private.h: Internals of RSVG

   Copyright (C) 2000 Eazel, Inc.
   Copyright (C) 2002 Dom Lachowicz <cinamod@hotmail.com>

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   This program 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this program; if not, write to the
   Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.

   Author: Raph Levien <raph@artofcode.com>
*/

#ifndef RSVG_PRIVATE_H
#define RSVG_PRIVATE_H

#include "rsvg.h"

#include <libxml/SAX.h>
#include <libxml/xmlmemory.h>
#include <pango/pango.h>
#include <libart_lgpl/art_rect.h>
#include <glib/gslist.h>

G_BEGIN_DECLS

typedef struct RsvgSaxHandler RsvgSaxHandler;
typedef struct _RsvgPropertyBag RsvgPropertyBag;
typedef struct _RsvgState RsvgState;
typedef struct _RsvgDefs RsvgDefs;
typedef struct _RsvgDefVal RsvgDefVal;
typedef struct _RsvgFilter RsvgFilter;

/* prepare for gettext */
#ifndef _
#define _(X) X
#endif

struct RsvgSaxHandler {
        void (*free) (RsvgSaxHandler *self);
        void (*start_element) (RsvgSaxHandler *self, const xmlChar *name, RsvgPropertyBag *atts);
        void (*end_element) (RsvgSaxHandler *self, const xmlChar *name);
        void (*characters) (RsvgSaxHandler *self, const xmlChar *ch, int len);
};

struct RsvgHandle {
        RsvgSizeFunc size_func;
        gpointer user_data;
        GDestroyNotify user_data_destroy;
        GdkPixbuf *pixbuf;
        ArtIRect bbox;

        /* stack; there is a state for each element */

        GSList * state;
        
        RsvgDefs *defs;
        guint in_defs;
        guint nest_level;
        void *current_defs_group;

        guint in_switch;

        GHashTable *css_props;
        
        /* not a handler stack. each nested handler keeps
         * track of its parent
         */
        RsvgSaxHandler *handler;
        int handler_nest;
        
        GHashTable *entities; /* g_malloc'd string -> xmlEntityPtr */
        
        PangoContext *pango_context;
        xmlParserCtxtPtr ctxt;
        GError **error;
        
        int width;
        int height;
        double dpi_x;
        double dpi_y;
        
        GString * title;
        GString * desc;
        
        gchar * base_uri;

        void * currentfilter;
        void * currentsubfilter;

        GMemChunk * state_allocator;

        /* virtual fns */
        gboolean (* write) (RsvgHandle    *handle,
                                                const guchar  *buf,
                                                gsize          count,
                                                GError       **error);
        
        gboolean (* close) (RsvgHandle  *handle,
                                                GError     **error);

        void (* free) (RsvgHandle * handle);
};

void rsvg_linear_gradient_free (RsvgDefVal *self);
void rsvg_radial_gradient_free (RsvgDefVal *self);
void rsvg_pattern_free (RsvgDefVal *self);

/* "super"/parent calls */
void rsvg_handle_init (RsvgHandle * handle);
gboolean rsvg_handle_write_impl (RsvgHandle    *handle,
                                                                 const guchar  *buf,
                                                                 gsize          count,
                                                                 GError       **error);
gboolean rsvg_handle_close_impl (RsvgHandle  *handle, 
                                                                 GError     **error);
void rsvg_handle_free_impl (RsvgHandle *handle);

typedef enum {
        RSVG_SIZE_ZOOM,
        RSVG_SIZE_WH,
        RSVG_SIZE_WH_MAX,
        RSVG_SIZE_ZOOM_MAX
} RsvgSizeType;

typedef enum {
        objectBoundingBox, userSpaceOnUse
} RsvgCoordUnits;

struct RsvgSizeCallbackData
{
        RsvgSizeType type;
        double x_zoom;
        double y_zoom;
        gint width;
        gint height;

        gboolean keep_aspect_ratio;
};

struct _RsvgPropertyBag
{
        GHashTable * props;
};

RsvgPropertyBag *
rsvg_property_bag_new (const xmlChar **atts);

void
rsvg_property_bag_free (RsvgPropertyBag *bag);

G_CONST_RETURN char *
rsvg_property_bag_lookup (RsvgPropertyBag *bag, const char * key);

guint
rsvg_property_bag_size (RsvgPropertyBag *bag);

GdkPixbuf *
rsvg_pixbuf_from_data_with_size_data (const guchar * buff,
                                                                          size_t len,
                                                                          struct RsvgSizeCallbackData * data,
                                                                          const char * base_uri,
                                                                          GError ** error);

G_CONST_RETURN char *
rsvg_handle_get_base_uri (RsvgHandle *handle);

void rsvg_handle_set_base_uri (RsvgHandle *handle,
                                                           const char *base_uri);

gboolean 
rsvg_eval_switch_attributes (RsvgPropertyBag *atts, gboolean * p_has_cond);

GdkPixbuf *
_rsvg_pixbuf_new_cleared (GdkColorspace colorspace, gboolean has_alpha, int bits_per_sample,
                                                  int width, int height);

G_END_DECLS

#endif