1 files changed, 299 insertions, 0 deletions

diff --git a/src/object/filters/composite.cpp b/src/object/filters/composite.cpp
new file mode 100644
index 0000000..cfd4336
--- /dev/null
+++ b/src/object/filters/composite.cpp
@@ -0,0 +1,299 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** \file
+ * SVG <feComposite> 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 "composite.h"
+
+#include "attributes.h"
+#include "helper-fns.h"
+
+#include "display/nr-filter.h"
+#include "display/nr-filter-composite.h"
+
+#include "object/sp-filter.h"
+
+#include "svg/svg.h"
+
+#include "xml/repr.h"
+
+SPFeComposite::SPFeComposite()
+    : SPFilterPrimitive(), composite_operator(COMPOSITE_DEFAULT),
+      k1(0), k2(0), k3(0), k4(0), in2(Inkscape::Filters::NR_FILTER_SLOT_NOT_SET)
+{
+}
+
+SPFeComposite::~SPFeComposite() = default;
+
+/**
+ * Reads the Inkscape::XML::Node, and initializes SPFeComposite 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 SPFeComposite::build(SPDocument *document, Inkscape::XML::Node *repr) {
+	SPFilterPrimitive::build(document, repr);
+
+	this->readAttr(SPAttr::OPERATOR);
+
+	if (this->composite_operator == COMPOSITE_ARITHMETIC) {
+		this->readAttr(SPAttr::K1);
+		this->readAttr(SPAttr::K2);
+		this->readAttr(SPAttr::K3);
+		this->readAttr(SPAttr::K4);
+	}
+
+	this->readAttr(SPAttr::IN2);
+
+	/* 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 SPFeComposite::release() {
+	SPFilterPrimitive::release();
+}
+
+static FeCompositeOperator
+sp_feComposite_read_operator(gchar const *value) {
+    if (!value) {
+    	return COMPOSITE_DEFAULT;
+    }
+
+    if (strcmp(value, "over") == 0) {
+    	return COMPOSITE_OVER;
+    } else if (strcmp(value, "in") == 0) {
+    	return COMPOSITE_IN;
+    } else if (strcmp(value, "out") == 0) {
+    	return COMPOSITE_OUT;
+    } else if (strcmp(value, "atop") == 0) {
+    	return COMPOSITE_ATOP;
+    } else if (strcmp(value, "xor") == 0) {
+    	return COMPOSITE_XOR;
+    } else if (strcmp(value, "arithmetic") == 0) {
+    	return COMPOSITE_ARITHMETIC;
+    } else if (strcmp(value, "lighter") == 0) {
+    	return COMPOSITE_LIGHTER;
+    }
+    std::cout << "Inkscape::Filters::FilterCompositeOperator: Unimplemented operator: " << value << std::endl;
+
+    return COMPOSITE_DEFAULT;
+}
+
+/**
+ * Sets a specific value in the SPFeComposite.
+ */
+void SPFeComposite::set(SPAttr key, gchar const *value) {
+    int input;
+    FeCompositeOperator op;
+    double k_n;
+    
+    switch(key) {
+	/*DEAL WITH SETTING ATTRIBUTES HERE*/
+        case SPAttr::OPERATOR:
+            op = sp_feComposite_read_operator(value);
+            if (op != this->composite_operator) {
+                this->composite_operator = op;
+                this->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            }
+            break;
+
+        case SPAttr::K1:
+            k_n = value ? helperfns_read_number(value) : 0;
+            if (k_n != this->k1) {
+                this->k1 = k_n;
+                if (this->composite_operator == COMPOSITE_ARITHMETIC)
+                    this->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            }
+            break;
+
+        case SPAttr::K2:
+            k_n = value ? helperfns_read_number(value) : 0;
+            if (k_n != this->k2) {
+                this->k2 = k_n;
+                if (this->composite_operator == COMPOSITE_ARITHMETIC)
+                    this->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            }
+            break;
+
+        case SPAttr::K3:
+            k_n = value ? helperfns_read_number(value) : 0;
+            if (k_n != this->k3) {
+                this->k3 = k_n;
+                if (this->composite_operator == COMPOSITE_ARITHMETIC)
+                    this->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            }
+            break;
+
+        case SPAttr::K4:
+            k_n = value ? helperfns_read_number(value) : 0;
+            if (k_n != this->k4) {
+                this->k4 = k_n;
+                if (this->composite_operator == COMPOSITE_ARITHMETIC)
+                    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 SPFeComposite::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. */
+    /* This may not be true.... see issue at 
+     * http://www.w3.org/TR/filter-effects/#feBlendElement (but it doesn't hurt). */
+    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);
+}
+
+/**
+ * Writes its settings to an incoming repr object, if any.
+ */
+Inkscape::XML::Node* SPFeComposite::write(Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags) {
+    SPFilter *parent = SP_FILTER(this->parent);
+
+    if (!repr) {
+        repr = doc->createElement("svg:feComposite");
+    }
+
+    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 feComposite");
+    }
+
+    char const *comp_op;
+
+    switch (this->composite_operator) {
+        case COMPOSITE_OVER:
+            comp_op = "over"; break;
+        case COMPOSITE_IN:
+            comp_op = "in"; break;
+        case COMPOSITE_OUT:
+            comp_op = "out"; break;
+        case COMPOSITE_ATOP:
+            comp_op = "atop"; break;
+        case COMPOSITE_XOR:
+            comp_op = "xor"; break;
+        case COMPOSITE_ARITHMETIC:
+            comp_op = "arithmetic"; break;
+        case COMPOSITE_LIGHTER:
+            comp_op = "lighter"; break;
+        default:
+            comp_op = nullptr;
+    }
+
+    repr->setAttribute("operator", comp_op);
+
+    if (this->composite_operator == COMPOSITE_ARITHMETIC) {
+        repr->setAttributeSvgDouble("k1", this->k1);
+        repr->setAttributeSvgDouble("k2", this->k2);
+        repr->setAttributeSvgDouble("k3", this->k3);
+        repr->setAttributeSvgDouble("k4", this->k4);
+    } else {
+        repr->removeAttribute("k1");
+        repr->removeAttribute("k2");
+        repr->removeAttribute("k3");
+        repr->removeAttribute("k4");
+    }
+
+    SPFilterPrimitive::write(doc, repr, flags);
+
+    return repr;
+}
+
+void SPFeComposite::build_renderer(Inkscape::Filters::Filter* filter) {
+    g_assert(filter != nullptr);
+
+    int primitive_n = filter->add_primitive(Inkscape::Filters::NR_FILTER_COMPOSITE);
+    Inkscape::Filters::FilterPrimitive *nr_primitive = filter->get_primitive(primitive_n);
+    Inkscape::Filters::FilterComposite *nr_composite = dynamic_cast<Inkscape::Filters::FilterComposite*>(nr_primitive);
+    g_assert(nr_composite != nullptr);
+
+    this->renderer_common(nr_primitive);
+
+    nr_composite->set_operator(this->composite_operator);
+    nr_composite->set_input(1, this->in2);
+
+    if (this->composite_operator == COMPOSITE_ARITHMETIC) {
+        nr_composite->set_arithmetic(this->k1, this->k2,
+                                     this->k3, this->k4);
+    }
+}
+
+/*
+  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 :