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->_image_modified_connection.disconnect();
 123     feImage->_href_modified_connection.disconnect();
 124     if (feImage->SVGElemRef) delete feImage->SVGElemRef;
 125
 126     if (((SPObjectClass *) feImage_parent_class)->release)
 127         ((SPObjectClass *) feImage_parent_class)->release(object);
 128 }
 129
 130 static void
 131 sp_feImage_elem_modified(SPObject* /*href*/, guint /*flags*/, SPObject* obj)
 132 {
 133     obj->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
 134 }
 135
 136 static void
 137 sp_feImage_href_modified(SPObject* old_elem, SPObject* new_elem, SPObject* obj)
 138 {
 139     SPFeImage *feImage = SP_FEIMAGE(obj);
 140     feImage->_image_modified_connection.disconnect();
 141     if (new_elem) {
 142         feImage->SVGElem = SP_ITEM(new_elem);
 143         feImage->_image_modified_connection = ((SPObject*) feImage->SVGElem)->connectModified(sigc::bind(sigc::ptr_fun(&sp_feImage_elem_modified), obj));
 144     } else {
 145         feImage->SVGElem = 0;
 146     }
 147
 148     obj->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
 149 }
 150
 151 /**
 152  * Sets a specific value in the SPFeImage.
 153  */
 154 static void
 155 sp_feImage_set(SPObject *object, unsigned int key, gchar const *value)
 156 {
 157     SPFeImage *feImage = SP_FEIMAGE(object);
 158     (void)feImage;
 159     switch(key) {
 160     /*DEAL WITH SETTING ATTRIBUTES HERE*/
 161         case SP_ATTR_XLINK_HREF:
 162             if (feImage->href) {
 163                 g_free(feImage->href);
 164             }
 165             feImage->href = (value) ? g_strdup (value) : NULL;
 166             if (!feImage->href) return;
 167             delete feImage->SVGElemRef;
 168             feImage->SVGElemRef = 0;
 169             feImage->SVGElem = 0;
 170             feImage->_image_modified_connection.disconnect();
 171             feImage->_href_modified_connection.disconnect();
 172             try{
 173                 Inkscape::URI SVGElem_uri(feImage->href);
 174                 feImage->SVGElemRef = new Inkscape::URIReference(feImage->document);
 175                 feImage->SVGElemRef->attach(SVGElem_uri);
 176                 feImage->from_element = true;
 177                 feImage->_href_modified_connection = feImage->SVGElemRef->changedSignal().connect(sigc::bind(sigc::ptr_fun(&sp_feImage_href_modified), object));
 178                 if (SPObject *elemref = feImage->SVGElemRef->getObject()) {
 179                     feImage->SVGElem = SP_ITEM(elemref);
 180                     feImage->_image_modified_connection = ((SPObject*) feImage->SVGElem)->connectModified(sigc::bind(sigc::ptr_fun(&sp_feImage_elem_modified), object));
 181                     object->requestModified(SP_OBJECT_MODIFIED_FLAG);
 182                     break;
 183                 } else {
 184                     g_warning("SVG element URI was not found in the document while loading feImage");
 185                 }
 186             }
 187             catch(const Inkscape::UnsupportedURIException & e)
 188             {
 189                 feImage->from_element = false;
 190                 /* This occurs when using external image as the source */
 191                 //g_warning("caught Inkscape::UnsupportedURIException in sp_feImage_set");
 192                 break;
 193             }
 194             break;
 195
 196         case SP_ATTR_X:
 197             feImage->x.readOrUnset(value);
 198             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
 199             break;
 200         case SP_ATTR_Y:
 201             feImage->y.readOrUnset(value);
 202             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
 203             break;
 204         case SP_ATTR_WIDTH:
 205             feImage->width.readOrUnset(value);
 206             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
 207             break;
 208         case SP_ATTR_HEIGHT:
 209             feImage->height.readOrUnset(value);
 210             object->requestModified(SP_OBJECT_MODIFIED_FLAG);
 211             break;
 212         default:
 213             if (((SPObjectClass *) feImage_parent_class)->set)
 214                 ((SPObjectClass *) feImage_parent_class)->set(object, key, value);
 215             break;
 216     }
 217
 218 }
 219
 220 /**
 221  * Receives update notifications.
 222  */
 223 static void
 224 sp_feImage_update(SPObject *object, SPCtx *ctx, guint flags)
 225 {
 226
 227     if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG |
 228                  SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
 229
 230         /* do something to trigger redisplay, updates? */
 231     }
 232
 233     if (((SPObjectClass *) feImage_parent_class)->update) {
 234         ((SPObjectClass *) feImage_parent_class)->update(object, ctx, flags);
 235     }
 236 }
 237
 238 /**
 239  * Writes its settings to an incoming repr object, if any.
 240  */
 241 static Inkscape::XML::Node *
 242 sp_feImage_write(SPObject *object, Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags)
 243 {
 244     // Inkscape-only object, not copied during an "plain SVG" dump:
 245     if (flags & SP_OBJECT_WRITE_EXT) {
 246         if (repr) {
 247             // is this sane?
 248             //repr->mergeFrom(SP_OBJECT_REPR(object), "id");
 249         } else {
 250             repr = SP_OBJECT_REPR(object)->duplicate(doc);
 251         }
 252     }
 253
 254     if (((SPObjectClass *) feImage_parent_class)->write) {
 255         ((SPObjectClass *) feImage_parent_class)->write(object, doc, repr, flags);
 256     }
 257
 258     return repr;
 259 }
 260
 261 static void sp_feImage_build_renderer(SPFilterPrimitive *primitive, Inkscape::Filters::Filter *filter) {
 262     g_assert(primitive != NULL);
 263     g_assert(filter != NULL);
 264
 265     SPFeImage *sp_image = SP_FEIMAGE(primitive);
 266
 267     int primitive_n = filter->add_primitive(Inkscape::Filters::NR_FILTER_IMAGE);
 268     Inkscape::Filters::FilterPrimitive *nr_primitive = filter->get_primitive(primitive_n);
 269     Inkscape::Filters::FilterImage *nr_image = dynamic_cast<Inkscape::Filters::FilterImage*>(nr_primitive);
 270     g_assert(nr_image != NULL);
 271
 272     sp_filter_primitive_renderer_common(primitive, nr_primitive);
 273
 274     nr_image->from_element = sp_image->from_element;
 275     nr_image->SVGElem = sp_image->SVGElem;
 276     nr_image->set_region(sp_image->x, sp_image->y, sp_image->width, sp_image->height);
 277     nr_image->set_href(sp_image->href);
 278     nr_image->set_document(sp_image->document);
 279 }
 280
 281 /*
 282   Local Variables:
 283   mode:c++
 284   c-file-style:"stroustrup"
 285   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 286   indent-tabs-mode:nil
 287   fill-column:99
 288   End:
 289 */
 290 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :