src/extension/internal/filter/filter.cpp

   1 /*
   2  * Authors:
   3  *   Ted Gould <ted@gould.cx>
   4  *
   5  * Copyright (C) 2008 Authors
   6  *
   7  * Released under GNU GPL, read the file 'COPYING' for more information
   8  */
   9
  10 #include "desktop.h"
  11 #include "selection.h"
  12 #include "document-private.h"
  13 #include "sp-item.h"
  14 #include "util/glib-list-iterators.h"
  15 #include "extension/extension.h"
  16 #include "extension/effect.h"
  17 #include "extension/system.h"
  18 #include "xml/repr.h"
  19 #include "xml/simple-node.h"
  20 #include "xml/attribute-record.h"
  21
  22 #include "filter.h"
  23
  24 namespace Inkscape {
  25 namespace Extension {
  26 namespace Internal {
  27 namespace Filter {
  28
  29 Filter::Filter() :
  30                 Inkscape::Extension::Implementation::Implementation(),
  31                 _filter(NULL) {
  32         return;
  33 }
  34
  35 Filter::Filter(gchar const * filter) :
  36                 Inkscape::Extension::Implementation::Implementation(),
  37                 _filter(filter) {
  38         return;
  39 }
  40
  41 Filter::~Filter (void) {
  42         if (_filter != NULL) {
  43                 _filter = NULL;
  44         }
  45
  46         return;
  47 }
  48
  49 bool
  50 Filter::load (Inkscape::Extension::Extension *module)
  51 {
  52         return true;
  53 }
  54
  55 Inkscape::Extension::Implementation::ImplementationDocumentCache *
  56 Filter::newDocCache (Inkscape::Extension::Extension * ext, Inkscape::UI::View::View * doc)
  57 {
  58         return NULL;
  59 }
  60
  61 gchar const *
  62 Filter::get_filter_text (Inkscape::Extension::Extension * ext)
  63 {
  64         return _filter;
  65 }
  66
  67 Inkscape::XML::Document *
  68 Filter::get_filter (Inkscape::Extension::Extension * ext) {
  69         gchar const * filter = get_filter_text(ext);
  70         return sp_repr_read_mem(filter, strlen(filter), NULL);
  71 }
  72
  73 void
  74 Filter::merge_filters (Inkscape::XML::Node * to, Inkscape::XML::Node * from, Inkscape::XML::Document * doc, gchar * srcGraphic, gchar * srcGraphicAlpha)
  75 {
  76         if (from == NULL) return;
  77
  78         // copy attributes
  79     for ( Inkscape::Util::List<Inkscape::XML::AttributeRecord const> iter = from->attributeList() ;
  80           iter ; ++iter ) {
  81                 gchar const * attr = g_quark_to_string(iter->key);
  82                 //printf("Attribute List: %s\n", attr);
  83                 if (!strcmp(attr, "id")) continue; // nope, don't copy that one!
  84                 to->setAttribute(attr, from->attribute(attr));
  85
  86                 if (!strcmp(attr, "in") || !strcmp(attr, "in2") || !strcmp(attr, "in3")) {
  87                         if (srcGraphic != NULL && !strcmp(from->attribute(attr), "SourceGraphic")) {
  88                                 to->setAttribute(attr, srcGraphic);
  89                         }
  90
  91                         if (srcGraphicAlpha != NULL && !strcmp(from->attribute(attr), "SourceAlpha")) {
  92                                 to->setAttribute(attr, srcGraphicAlpha);
  93                         }
  94                 }
  95         }
  96
  97         // for each child call recursively
  98         for (Inkscape::XML::Node * from_child = from->firstChild();
  99                   from_child != NULL ; from_child = from_child->next()) {
 100                 Glib::ustring name = "svg:";
 101                 name += from_child->name();
 102
 103                 Inkscape::XML::Node * to_child = doc->createElement(name.c_str());
 104                 to->appendChild(to_child);
 105                 merge_filters(to_child, from_child, doc, srcGraphic, srcGraphicAlpha);
 106
 107                 if (from_child == from->firstChild() && !strcmp("filter", from->name()) && srcGraphic != NULL && to_child->attribute("in") == NULL) {
 108                         to_child->setAttribute("in", srcGraphic);
 109                 }
 110         }
 111
 112         return;
 113 }
 114
 115 #define FILTER_SRC_GRAPHIC       "fbSourceGraphic"
 116 #define FILTER_SRC_GRAPHIC_ALPHA "fbSourceGraphicAlpha"
 117
 118 void
 119 Filter::effect (Inkscape::Extension::Effect *module, Inkscape::UI::View::View *document, Inkscape::Extension::Implementation::ImplementationDocumentCache * docCache)
 120 {
 121         //printf("Calling filter effect\n");
 122     Inkscape::Selection * selection = ((SPDesktop *)document)->selection;
 123
 124     using Inkscape::Util::GSListConstIterator;
 125     // TODO need to properly refcount the items, at least
 126     std::list<SPItem *> items;
 127     items.insert<GSListConstIterator<SPItem *> >(items.end(), selection->itemList(), NULL);
 128
 129         Inkscape::XML::Document * xmldoc = sp_document_repr_doc(document->doc());
 130         Inkscape::XML::Node * defsrepr = SP_OBJECT_REPR(SP_DOCUMENT_DEFS(document->doc()));
 131
 132     for(std::list<SPItem *>::iterator item = items.begin();
 133             item != items.end(); item++) {
 134         SPItem * spitem = *item;
 135                 Inkscape::XML::Node * node = SP_OBJECT_REPR(spitem);
 136
 137                 SPCSSAttr * css = sp_repr_css_attr(node, "style");
 138                 gchar const * filter = sp_repr_css_property(css, "filter", NULL);
 139
 140                 if (filter == NULL) {
 141                         Inkscape::XML::Node * newfilterroot = xmldoc->createElement("svg:filter");
 142                         defsrepr->appendChild(newfilterroot);
 143                         Glib::ustring url = "url(#"; url += newfilterroot->attribute("id"); url += ")";
 144
 145                         merge_filters(newfilterroot, get_filter(module)->root(), xmldoc);
 146
 147                         sp_repr_css_set_property(css, "filter", url.c_str());
 148                         sp_repr_css_set(node, css, "style");
 149                 } else {
 150                         if (strncmp(filter, "url(#", strlen("url(#")) || filter[strlen(filter) - 1] != ')') {
 151                                 // This is not url(#id) -- we can't handle it
 152                                 continue;
 153                         }
 154
 155                         gchar * lfilter = g_strndup(filter + 5, strlen(filter) - 6);
 156                         Inkscape::XML::Node * filternode = NULL;
 157                         for (Inkscape::XML::Node * child = defsrepr->firstChild(); child != NULL; child = child->next()) {
 158                                 if (!strcmp(lfilter, child->attribute("id"))) {
 159                                         filternode = child;
 160                                         break;
 161                                 }
 162                         }
 163                         g_free(lfilter);
 164
 165                         if (filternode == NULL) {
 166                                 continue;
 167                         }
 168
 169                         filternode->lastChild()->setAttribute("result", FILTER_SRC_GRAPHIC);
 170
 171                         Inkscape::XML::Node * alpha = xmldoc->createElement("svg:feColorMatrix");
 172                         alpha->setAttribute("result", FILTER_SRC_GRAPHIC_ALPHA);
 173                         alpha->setAttribute("in", FILTER_SRC_GRAPHIC); // not required, but we're being explicit
 174                         alpha->setAttribute("values", "0 0 0 -1 0 0 0 0 -1 0 0 0 0 -1 0 0 0 0 1 0");
 175                         filternode->appendChild(alpha);
 176
 177                         merge_filters(filternode, get_filter(module)->root(), xmldoc, FILTER_SRC_GRAPHIC, FILTER_SRC_GRAPHIC_ALPHA);
 178                 }
 179     }
 180
 181     return;
 182 }
 183
 184 #include "extension/internal/clear-n_.h"
 185
 186 void
 187 Filter::filter_init (gchar const * id, gchar const * name, gchar const * tip, gchar const * filter)
 188 {
 189         gchar * xml_str = g_strdup_printf(
 190         "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
 191             "<name>%s</name>\n"
 192             "<id>org.inkscape.effect.filter.%s</id>\n"
 193             "<effect>\n"
 194                 "<object-type>all</object-type>\n"
 195                 "<effects-menu>\n"
 196                     "<submenu name=\"" N_("Filter") "\" />\n"
 197                 "</effects-menu>\n"
 198                 "<menu-tip>%s</menu-tip>\n"
 199             "</effect>\n"
 200         "</inkscape-extension>\n", name, id, tip);
 201     Inkscape::Extension::build_from_mem(xml_str, new Filter::Filter(filter));
 202         g_free(xml_str);
 203     return;
 204 }
 205
 206 }; /* namespace Filter */
 207 }; /* namespace Internal */
 208 }; /* namespace Extension */
 209 }; /* namespace Inkscape */
 210