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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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