src/filters/image.cpp

   1 #define __SP_FEIMAGE_CPP__
   2
   3 /** \file
   4  * SVG <feImage> implementation.
   5  *
   6  */
   7 /*
   8  * Authors:
   9  *   Felipe Corrêa da Silva Sanches <felipe.sanches@gmail.com>
  10  *   hugo Rodrigues <haa.rodrigues@gmail.com>
  11  *
  12  * Copyright (C) 2007 Felipe Sanches
  13  * Copyright (C) 2006 Hugo Rodrigues
  14  *
  15  * Released under GNU GPL, read the file 'COPYING' for more information
  16  */
  17
  18 #ifdef HAVE_CONFIG_H
  19 # include "config.h"
  20 #endif
  21 #include "uri.h"
  22 #include "uri-references.h"
  23 #include "attributes.h"
  24 #include "svg/svg.h"
  25 #include "image.h"
  26 #include "xml/repr.h"
  27 #include <string.h>
  28
  29 #include "display/nr-filter.h"
  30 #include "display/nr-filter-image.h"
  31
  32 /* FeImage base class */
  33
  34 static void sp_feImage_class_init(SPFeImageClass *klass);
  35 static void sp_feImage_init(SPFeImage *feImage);
  36
  37 static void sp_feImage_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);
  38 static void sp_feImage_release(SPObject *object);
  39 static void sp_feImage_set(SPObject *object, unsigned int key, gchar const *value);
  40 static void sp_feImage_update(SPObject *object, SPCtx *ctx, guint flags);
  41 static Inkscape::XML::Node *sp_feImage_write(SPObject *object, Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags);
  42 static void sp_feImage_build_renderer(SPFilterPrimitive *primitive, Inkscape::Filters::Filter *filter);
  43
  44 static SPFilterPrimitiveClass *feImage_parent_class;
  45
  46 GType
  47 sp_feImage_get_type()
  48 {
  49     static GType feImage_type = 0;
  50
  51     if (!feImage_type) {
  52         GTypeInfo feImage_info = {
  53             sizeof(SPFeImageClass),
  54             NULL, NULL,
  55             (GClassInitFunc) sp_feImage_class_init,
  56             NULL, NULL,
  57             sizeof(SPFeImage),
  58             16,
  59             (GInstanceInitFunc) sp_feImage_init,
  60             NULL,    /* value_table */
  61         };
  62         feImage_type = g_type_register_static(SP_TYPE_FILTER_PRIMITIVE, "SPFeImage", &feImage_info, (GTypeFlags)0);
  63     }
  64     return feImage_type;
  65 }
  66
  67 static void
  68 sp_feImage_class_init(SPFeImageClass *klass)
  69 {
  70     SPObjectClass *sp_object_class = (SPObjectClass *)klass;
  71     SPFilterPrimitiveClass * sp_primitive_class = (SPFilterPrimitiveClass *)klass;
  72
  73     feImage_parent_class = (SPFilterPrimitiveClass*)g_type_class_peek_parent(klass);
  74
  75     sp_object_class->build = sp_feImage_build;
  76     sp_object_class->release = sp_feImage_release;
  77     sp_object_class->write = sp_feImage_write;
  78     sp_object_class->set = sp_feImage_set;
  79     sp_object_class->update = sp_feImage_update;
  80
  81     sp_primitive_class->build_renderer = sp_feImage_build_renderer;
  82 }
  83
  84 static void
  85 sp_feImage_init(SPFeImage */*feImage*/)
  86 {
  87 }
  88
  89 /**
  90  * Reads the Inkscape::XML::Node, and initializes SPFeImage variables.  For this to get called,
  91  * our name must be associated with a repr via "sp_object_type_register".  Best done through
  92  * sp-object-repr.cpp's repr_name_entries array.
  93  */
  94 static void
  95 sp_feImage_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
  96 {
  97     // Save document reference so we can load images with relative paths.
  98     SPFeImage *feImage = SP_FEIMAGE(object);
  99     feImage->document = document;
 100
 101     if (((SPObjectClass *) feImage_parent_class)->build) {
 102         ((SPObjectClass *) feImage_parent_class)->build(object, document, repr);
 103     }
 104
 105     /*LOAD ATTRIBUTES FROM REPR HERE*/
 106
 107     sp_object_read_attr(object, "x");
 108     sp_object_read_attr(object, "y");
 109     sp_object_read_attr(object, "width");
 110     sp_object_read_attr(object, "height");
 111     sp_object_read_attr(object, "xlink:href");
 112
 113 }
 114
 115 /**
 116  * Drops any allocated memory.
 117  */
 118 static void
 119 sp_feImage_release(SPObject *object)
 120 {
 121     SPFeImage *feImage = SP_FEIMAGE(object);
 122     feImage->_modified_connection.disconnect();
 123     if (feImage->SVGElemRef) delete feImage->SVGElemRef;
 124
 125     if (((SPObjectClass *) feImage_parent_class)->release)
 126         ((SPObjectClass *) feImage_parent_class)->release(object);
 127 }
 128
 129 static void
 130 sp_feImage_elem_modified(SPObject* /*href*/, guint /*flags*/, SPObject* obj)
 131 {
 132     obj->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
 133 }
 134
 135 /**
 136  * Sets a specific value in the SPFeImage.
 137  */
 138 static void
 139 sp_feImage_set(SPObject *object, unsigned int key, gchar const *value)
 140 {
 141     SPFeImage *feImage = SP_FEIMAGE(object);
 142     (void)feImage;
 143     switch(key) {
 144     /*DEAL WITH SETTING ATTRIBUTES HERE*/
 145         case SP_ATTR_XLINK_HREF:
 146             if (feImage->href) {
 147                 g_free(feImage->href);
 148             }
 149             feImage->href = (value) ? g_strdup (value) : NULL;
 150             if (!feImage->href) return;
 151             try{
 152                 Inkscape::URI SVGElem_uri(feImage->href);
 153                 delete feImage->SVGElemRef;
 154                 feImage->SVGElemRef = new Inkscape::URIReference(feImage->document);
 155                 feImage->from_element = true;
 156                 feImage->SVGElemRef->attach(SVGElem_uri);
 157                 if (SPObject *elemref = feImage->SVGElemRef->getObject()) {
 158                     feImage->SVGElem = SP_ITEM(elemref);
 159
 160                     feImage->_modified_connection = ((SPObject*) feImage->SVGElem)->connectModified(sigc::bind(sigc::ptr_fun(&sp_feImage_elem_modified), object));
 161                     object->requestModified(SP_OBJECT_MODIFIED_FLAG);
 162                     break;
 163                 } else {
 164                     g_warning("SVG element URI was not found in the document while loading feImage");
 165                 }
 166             }
 167             catch(const Inkscape::UnsupportedURIException & e)
 168             {
 169                 feImage->from_element = false;
 170                 g_warning("caught Inkscape::UnsupportedURIException in sp_feImage_set");
 171                 break;
 172             }
 173
 174
 175         case SP_ATTR_X:
 176             feImage->x.readOrUnset(value);
 177             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
 178             break;
 179         case SP_ATTR_Y:
 180             feImage->y.readOrUnset(value);
 181             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
 182             break;
 183         case SP_ATTR_WIDTH:
 184             feImage->width.readOrUnset(value);
 185             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
 186             break;
 187         case SP_ATTR_HEIGHT:
 188             feImage->height.readOrUnset(value);
 189             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
 190             break;
 191         default:
 192             if (((SPObjectClass *) feImage_parent_class)->set)
 193                 ((SPObjectClass *) feImage_parent_class)->set(object, key, value);
 194             break;
 195     }
 196
 197 }
 198
 199 /**
 200  * Receives update notifications.
 201  */
 202 static void
 203 sp_feImage_update(SPObject *object, SPCtx *ctx, guint flags)
 204 {
 205
 206     if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG |
 207                  SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
 208
 209         /* do something to trigger redisplay, updates? */
 210     }
 211
 212     if (((SPObjectClass *) feImage_parent_class)->update) {
 213         ((SPObjectClass *) feImage_parent_class)->update(object, ctx, flags);
 214     }
 215 }
 216
 217 /**
 218  * Writes its settings to an incoming repr object, if any.
 219  */
 220 static Inkscape::XML::Node *
 221 sp_feImage_write(SPObject *object, Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags)
 222 {
 223     // Inkscape-only object, not copied during an "plain SVG" dump:
 224     if (flags & SP_OBJECT_WRITE_EXT) {
 225         if (repr) {
 226             // is this sane?
 227             //repr->mergeFrom(SP_OBJECT_REPR(object), "id");
 228         } else {
 229             repr = SP_OBJECT_REPR(object)->duplicate(doc);
 230         }
 231     }
 232
 233     if (((SPObjectClass *) feImage_parent_class)->write) {
 234         ((SPObjectClass *) feImage_parent_class)->write(object, doc, repr, flags);
 235     }
 236
 237     return repr;
 238 }
 239
 240 static void sp_feImage_build_renderer(SPFilterPrimitive *primitive, Inkscape::Filters::Filter *filter) {
 241     g_assert(primitive != NULL);
 242     g_assert(filter != NULL);
 243
 244     SPFeImage *sp_image = SP_FEIMAGE(primitive);
 245
 246     int primitive_n = filter->add_primitive(Inkscape::Filters::NR_FILTER_IMAGE);
 247     Inkscape::Filters::FilterPrimitive *nr_primitive = filter->get_primitive(primitive_n);
 248     Inkscape::Filters::FilterImage *nr_image = dynamic_cast<Inkscape::Filters::FilterImage*>(nr_primitive);
 249     g_assert(nr_image != NULL);
 250
 251     sp_filter_primitive_renderer_common(primitive, nr_primitive);
 252
 253     nr_image->from_element = sp_image->from_element;
 254     nr_image->SVGElem = sp_image->SVGElem;
 255     nr_image->set_region(sp_image->x, sp_image->y, sp_image->width, sp_image->height);
 256     nr_image->set_href(sp_image->href);
 257     nr_image->set_document(sp_image->document);
 258 }
 259
 260 /*
 261   Local Variables:
 262   mode:c++
 263   c-file-style:"stroustrup"
 264   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 265   indent-tabs-mode:nil
 266   fill-column:99
 267   End:
 268 */
 269 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :