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 <juca@members.fsf.org>
  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 sp_feImage_get_type()
  47 {
  48     static GType feImage_type = 0;
  49
  50     if (!feImage_type) {
  51         GTypeInfo feImage_info = {
  52             sizeof(SPFeImageClass),
  53             NULL, NULL,
  54             (GClassInitFunc) sp_feImage_class_init,
  55             NULL, NULL,
  56             sizeof(SPFeImage),
  57             16,
  58             (GInstanceInitFunc) sp_feImage_init,
  59             NULL,    /* value_table */
  60         };
  61         feImage_type = g_type_register_static(SP_TYPE_FILTER_PRIMITIVE, "SPFeImage", &feImage_info, (GTypeFlags)0);
  62     }
  63     return feImage_type;
  64 }
  65
  66 static void sp_feImage_class_init(SPFeImageClass *klass)
  67 {
  68     SPObjectClass *sp_object_class = (SPObjectClass *)klass;
  69     SPFilterPrimitiveClass * sp_primitive_class = (SPFilterPrimitiveClass *)klass;
  70
  71     feImage_parent_class = (SPFilterPrimitiveClass*)g_type_class_peek_parent(klass);
  72
  73     sp_object_class->build = sp_feImage_build;
  74     sp_object_class->release = sp_feImage_release;
  75     sp_object_class->write = sp_feImage_write;
  76     sp_object_class->set = sp_feImage_set;
  77     sp_object_class->update = sp_feImage_update;
  78
  79     sp_primitive_class->build_renderer = sp_feImage_build_renderer;
  80 }
  81
  82 static void sp_feImage_init(SPFeImage */*feImage*/)
  83 {
  84 }
  85
  86 /**
  87  * Reads the Inkscape::XML::Node, and initializes SPFeImage variables.  For this to get called,
  88  * our name must be associated with a repr via "sp_object_type_register".  Best done through
  89  * sp-object-repr.cpp's repr_name_entries array.
  90  */
  91 static void sp_feImage_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
  92 {
  93     // Save document reference so we can load images with relative paths.
  94     SPFeImage *feImage = SP_FEIMAGE(object);
  95     feImage->document = document;
  96
  97     if (((SPObjectClass *) feImage_parent_class)->build) {
  98         ((SPObjectClass *) feImage_parent_class)->build(object, document, repr);
  99     }
 100
 101     /*LOAD ATTRIBUTES FROM REPR HERE*/
 102
 103     object->readAttr( "x");
 104     object->readAttr( "y");
 105     object->readAttr( "width");
 106     object->readAttr( "height");
 107     object->readAttr( "xlink:href");
 108
 109 }
 110
 111 /**
 112  * Drops any allocated memory.
 113  */
 114 static void sp_feImage_release(SPObject *object)
 115 {
 116     SPFeImage *feImage = SP_FEIMAGE(object);
 117     feImage->_image_modified_connection.disconnect();
 118     feImage->_href_modified_connection.disconnect();
 119     if (feImage->SVGElemRef) delete feImage->SVGElemRef;
 120
 121     if (((SPObjectClass *) feImage_parent_class)->release)
 122         ((SPObjectClass *) feImage_parent_class)->release(object);
 123 }
 124
 125 static void sp_feImage_elem_modified(SPObject* /*href*/, guint /*flags*/, SPObject* obj)
 126 {
 127     obj->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
 128 }
 129
 130 static void sp_feImage_href_modified(SPObject* /*old_elem*/, SPObject* new_elem, SPObject* obj)
 131 {
 132     SPFeImage *feImage = SP_FEIMAGE(obj);
 133     feImage->_image_modified_connection.disconnect();
 134     if (new_elem) {
 135         feImage->SVGElem = SP_ITEM(new_elem);
 136         feImage->_image_modified_connection = ((SPObject*) feImage->SVGElem)->connectModified(sigc::bind(sigc::ptr_fun(&sp_feImage_elem_modified), obj));
 137     } else {
 138         feImage->SVGElem = 0;
 139     }
 140
 141     obj->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
 142 }
 143
 144 /**
 145  * Sets a specific value in the SPFeImage.
 146  */
 147 static void sp_feImage_set(SPObject *object, unsigned int key, gchar const *value)
 148 {
 149     SPFeImage *feImage = SP_FEIMAGE(object);
 150     (void)feImage;
 151     switch(key) {
 152     /*DEAL WITH SETTING ATTRIBUTES HERE*/
 153         case SP_ATTR_XLINK_HREF:
 154             if (feImage->href) {
 155                 g_free(feImage->href);
 156             }
 157             feImage->href = (value) ? g_strdup (value) : NULL;
 158             if (!feImage->href) return;
 159             delete feImage->SVGElemRef;
 160             feImage->SVGElemRef = 0;
 161             feImage->SVGElem = 0;
 162             feImage->_image_modified_connection.disconnect();
 163             feImage->_href_modified_connection.disconnect();
 164             try{
 165                 Inkscape::URI SVGElem_uri(feImage->href);
 166                 feImage->SVGElemRef = new Inkscape::URIReference(feImage->document);
 167                 feImage->SVGElemRef->attach(SVGElem_uri);
 168                 feImage->from_element = true;
 169                 feImage->_href_modified_connection = feImage->SVGElemRef->changedSignal().connect(sigc::bind(sigc::ptr_fun(&sp_feImage_href_modified), object));
 170                 if (SPObject *elemref = feImage->SVGElemRef->getObject()) {
 171                     feImage->SVGElem = SP_ITEM(elemref);
 172                     feImage->_image_modified_connection = ((SPObject*) feImage->SVGElem)->connectModified(sigc::bind(sigc::ptr_fun(&sp_feImage_elem_modified), object));
 173                     object->requestModified(SP_OBJECT_MODIFIED_FLAG);
 174                     break;
 175                 } else {
 176                     g_warning("SVG element URI was not found in the document while loading feImage");
 177                 }
 178             }
 179             // catches either MalformedURIException or UnsupportedURIException
 180             catch(const Inkscape::BadURIException & e)
 181             {
 182                 feImage->from_element = false;
 183                 /* This occurs when using external image as the source */
 184                 //g_warning("caught Inkscape::BadURIException in sp_feImage_set");
 185                 break;
 186             }
 187             break;
 188
 189         case SP_ATTR_X:
 190             feImage->x.readOrUnset(value);
 191             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
 192             break;
 193         case SP_ATTR_Y:
 194             feImage->y.readOrUnset(value);
 195             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
 196             break;
 197         case SP_ATTR_WIDTH:
 198             feImage->width.readOrUnset(value);
 199             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
 200             break;
 201         case SP_ATTR_HEIGHT:
 202             feImage->height.readOrUnset(value);
 203             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
 204             break;
 205         default:
 206             if (((SPObjectClass *) feImage_parent_class)->set)
 207                 ((SPObjectClass *) feImage_parent_class)->set(object, key, value);
 208             break;
 209     }
 210
 211 }
 212
 213 /**
 214  * Receives update notifications.
 215  */
 216 static void sp_feImage_update(SPObject *object, SPCtx *ctx, guint flags)
 217 {
 218
 219     if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG |
 220                  SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
 221
 222         /* do something to trigger redisplay, updates? */
 223     }
 224
 225     if (((SPObjectClass *) feImage_parent_class)->update) {
 226         ((SPObjectClass *) feImage_parent_class)->update(object, ctx, flags);
 227     }
 228 }
 229
 230 /**
 231  * Writes its settings to an incoming repr object, if any.
 232  */
 233 static Inkscape::XML::Node * sp_feImage_write(SPObject *object, Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags)
 234 {
 235     /* TODO: Don't just clone, but create a new repr node and write all
 236      * relevant values into it */
 237     if (!repr) {
 238         repr = SP_OBJECT_REPR(object)->duplicate(doc);
 239     }
 240
 241     if (((SPObjectClass *) feImage_parent_class)->write) {
 242         ((SPObjectClass *) feImage_parent_class)->write(object, doc, repr, flags);
 243     }
 244
 245     return repr;
 246 }
 247
 248 static void sp_feImage_build_renderer(SPFilterPrimitive *primitive, Inkscape::Filters::Filter *filter) {
 249     g_assert(primitive != NULL);
 250     g_assert(filter != NULL);
 251
 252     SPFeImage *sp_image = SP_FEIMAGE(primitive);
 253
 254     int primitive_n = filter->add_primitive(Inkscape::Filters::NR_FILTER_IMAGE);
 255     Inkscape::Filters::FilterPrimitive *nr_primitive = filter->get_primitive(primitive_n);
 256     Inkscape::Filters::FilterImage *nr_image = dynamic_cast<Inkscape::Filters::FilterImage*>(nr_primitive);
 257     g_assert(nr_image != NULL);
 258
 259     sp_filter_primitive_renderer_common(primitive, nr_primitive);
 260
 261     nr_image->from_element = sp_image->from_element;
 262     nr_image->SVGElem = sp_image->SVGElem;
 263     nr_image->set_region(sp_image->x, sp_image->y, sp_image->width, sp_image->height);
 264     nr_image->set_href(sp_image->href);
 265     nr_image->set_document(sp_image->document);
 266 }
 267
 268 /*
 269   Local Variables:
 270   mode:c++
 271   c-file-style:"stroustrup"
 272   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 273   indent-tabs-mode:nil
 274   fill-column:99
 275   End:
 276 */
 277 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :