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-rw-r--r--src/object/filters/displacementmap.cpp256
1 files changed, 256 insertions, 0 deletions
diff --git a/src/object/filters/displacementmap.cpp b/src/object/filters/displacementmap.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** \file
+ * SVG <feDisplacementMap> implementation.
+ *
+ */
+/*
+ * Authors:
+ * hugo Rodrigues <haa.rodrigues@gmail.com>
+ * Abhishek Sharma
+ *
+ * Copyright (C) 2006 Hugo Rodrigues
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "displacementmap.h"
+
+#include "attributes.h"
+#include "helper-fns.h"
+
+#include "display/nr-filter-displacement-map.h"
+#include "display/nr-filter.h"
+
+#include "object/sp-filter.h"
+
+#include "svg/svg.h"
+
+#include "xml/repr.h"
+
+SPFeDisplacementMap::SPFeDisplacementMap() : SPFilterPrimitive() {
+ this->scale=0;
+ this->xChannelSelector = DISPLACEMENTMAP_CHANNEL_ALPHA;
+ this->yChannelSelector = DISPLACEMENTMAP_CHANNEL_ALPHA;
+ this->in2 = Inkscape::Filters::NR_FILTER_SLOT_NOT_SET;
+}
+
+SPFeDisplacementMap::~SPFeDisplacementMap() = default;
+
+/**
+ * Reads the Inkscape::XML::Node, and initializes SPFeDisplacementMap variables. For this to get called,
+ * our name must be associated with a repr via "sp_object_type_register". Best done through
+ * sp-object-repr.cpp's repr_name_entries array.
+ */
+void SPFeDisplacementMap::build(SPDocument *document, Inkscape::XML::Node *repr) {
+ SPFilterPrimitive::build(document, repr);
+
+ /*LOAD ATTRIBUTES FROM REPR HERE*/
+ this->readAttr(SPAttr::SCALE);
+ this->readAttr(SPAttr::IN2);
+ this->readAttr(SPAttr::XCHANNELSELECTOR);
+ this->readAttr(SPAttr::YCHANNELSELECTOR);
+
+ /* Unlike normal in, in2 is required attribute. Make sure, we can call
+ * it by some name. */
+ if (this->in2 == Inkscape::Filters::NR_FILTER_SLOT_NOT_SET ||
+ this->in2 == Inkscape::Filters::NR_FILTER_UNNAMED_SLOT)
+ {
+ SPFilter *parent = SP_FILTER(this->parent);
+ this->in2 = this->name_previous_out();
+ repr->setAttribute("in2", parent->name_for_image(this->in2));
+ }
+}
+
+/**
+ * Drops any allocated memory.
+ */
+void SPFeDisplacementMap::release() {
+ SPFilterPrimitive::release();
+}
+
+static FilterDisplacementMapChannelSelector sp_feDisplacementMap_readChannelSelector(gchar const *value)
+{
+ if (!value) return DISPLACEMENTMAP_CHANNEL_ALPHA;
+
+ switch (value[0]) {
+ case 'R':
+ return DISPLACEMENTMAP_CHANNEL_RED;
+ break;
+ case 'G':
+ return DISPLACEMENTMAP_CHANNEL_GREEN;
+ break;
+ case 'B':
+ return DISPLACEMENTMAP_CHANNEL_BLUE;
+ break;
+ case 'A':
+ return DISPLACEMENTMAP_CHANNEL_ALPHA;
+ break;
+ default:
+ // error
+ g_warning("Invalid attribute for Channel Selector. Valid modes are 'R', 'G', 'B' or 'A'");
+ break;
+ }
+
+ return DISPLACEMENTMAP_CHANNEL_ALPHA; //default is Alpha Channel
+}
+
+/**
+ * Sets a specific value in the SPFeDisplacementMap.
+ */
+void SPFeDisplacementMap::set(SPAttr key, gchar const *value) {
+ int input;
+ double read_num;
+ FilterDisplacementMapChannelSelector read_selector;
+
+ switch(key) {
+ /*DEAL WITH SETTING ATTRIBUTES HERE*/
+ case SPAttr::XCHANNELSELECTOR:
+ read_selector = sp_feDisplacementMap_readChannelSelector(value);
+
+ if (read_selector != this->xChannelSelector){
+ this->xChannelSelector = read_selector;
+ this->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
+ }
+ break;
+ case SPAttr::YCHANNELSELECTOR:
+ read_selector = sp_feDisplacementMap_readChannelSelector(value);
+
+ if (read_selector != this->yChannelSelector){
+ this->yChannelSelector = read_selector;
+ this->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
+ }
+ break;
+ case SPAttr::SCALE:
+ read_num = value ? helperfns_read_number(value) : 0;
+
+ if (read_num != this->scale) {
+ this->scale = read_num;
+ this->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
+ }
+ break;
+ case SPAttr::IN2:
+ input = this->read_in(value);
+
+ if (input != this->in2) {
+ this->in2 = input;
+ this->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
+ }
+ break;
+ default:
+ SPFilterPrimitive::set(key, value);
+ break;
+ }
+}
+
+/**
+ * Receives update notifications.
+ */
+void SPFeDisplacementMap::update(SPCtx *ctx, guint flags) {
+ if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG |
+ SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
+
+ /* do something to trigger redisplay, updates? */
+
+ }
+
+ /* Unlike normal in, in2 is required attribute. Make sure, we can call
+ * it by some name. */
+ if (this->in2 == Inkscape::Filters::NR_FILTER_SLOT_NOT_SET ||
+ this->in2 == Inkscape::Filters::NR_FILTER_UNNAMED_SLOT)
+ {
+ SPFilter *parent = SP_FILTER(this->parent);
+ this->in2 = this->name_previous_out();
+
+ //XML Tree being used directly here while it shouldn't be.
+ this->setAttribute("in2", parent->name_for_image(this->in2));
+ }
+
+ SPFilterPrimitive::update(ctx, flags);
+}
+
+static char const * get_channelselector_name(FilterDisplacementMapChannelSelector selector) {
+ switch(selector) {
+ case DISPLACEMENTMAP_CHANNEL_RED:
+ return "R";
+ case DISPLACEMENTMAP_CHANNEL_GREEN:
+ return "G";
+ case DISPLACEMENTMAP_CHANNEL_BLUE:
+ return "B";
+ case DISPLACEMENTMAP_CHANNEL_ALPHA:
+ return "A";
+ default:
+ return nullptr;
+ }
+}
+
+/**
+ * Writes its settings to an incoming repr object, if any.
+ */
+Inkscape::XML::Node* SPFeDisplacementMap::write(Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags) {
+ SPFilter *parent = SP_FILTER(this->parent);
+
+ if (!repr) {
+ repr = doc->createElement("svg:feDisplacementMap");
+ }
+
+ gchar const *in2_name = parent->name_for_image(this->in2);
+
+ if( !in2_name ) {
+
+ // This code is very similar to name_previous_out()
+ SPObject *i = parent->firstChild();
+
+ // Find previous filter primitive
+ while (i && i->getNext() != this) {
+ i = i->getNext();
+ }
+
+ if( i ) {
+ SPFilterPrimitive *i_prim = SP_FILTER_PRIMITIVE(i);
+ in2_name = parent->name_for_image(i_prim->image_out);
+ }
+ }
+
+ if (in2_name) {
+ repr->setAttribute("in2", in2_name);
+ } else {
+ g_warning("Unable to set in2 for feDisplacementMap");
+ }
+
+ repr->setAttributeSvgDouble("scale", this->scale);
+ repr->setAttribute("xChannelSelector",
+ get_channelselector_name(this->xChannelSelector));
+ repr->setAttribute("yChannelSelector",
+ get_channelselector_name(this->yChannelSelector));
+
+ SPFilterPrimitive::write(doc, repr, flags);
+
+ return repr;
+}
+
+void SPFeDisplacementMap::build_renderer(Inkscape::Filters::Filter* filter) {
+ g_assert(filter != nullptr);
+
+ int primitive_n = filter->add_primitive(Inkscape::Filters::NR_FILTER_DISPLACEMENTMAP);
+ Inkscape::Filters::FilterPrimitive *nr_primitive = filter->get_primitive(primitive_n);
+ Inkscape::Filters::FilterDisplacementMap *nr_displacement_map = dynamic_cast<Inkscape::Filters::FilterDisplacementMap*>(nr_primitive);
+ g_assert(nr_displacement_map != nullptr);
+
+ this->renderer_common(nr_primitive);
+
+ nr_displacement_map->set_input(1, this->in2);
+ nr_displacement_map->set_scale(this->scale);
+ nr_displacement_map->set_channel_selector(0, this->xChannelSelector);
+ nr_displacement_map->set_channel_selector(1, this->yChannelSelector);
+}
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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