Offline work done during weekend:

* handle fefuncR, fefuncG, fefuncB and fefuncA nodes
* implement fecomponenttransfer renderer
** identity and gamma modes render perfectly
** linear and table modes are rendering with very slight imperfections

This commit still mantains feComponentTransfer out of UI (still not implemented)

(bzr r4704)

1 files changed, 344 insertions, 0 deletions

diff --git a/src/sp-fecomponenttransfer-funcnode.cpp b/src/sp-fecomponenttransfer-funcnode.cpp
new file mode 100644
index 000000000..84f71970c
--- /dev/null
+++ b/src/sp-fecomponenttransfer-funcnode.cpp
@@ -0,0 +1,344 @@
+#define __SP_FEFUNCNODE_CPP__
+
+/** \file
+ * SVG <funcR>, <funcG>, <funcB> and <funcA> implementations.
+ */
+/*
+ * Authors:
+ *   Hugo Rodrigues <haa.rodrigues@gmail.com>
+ *   Niko Kiirala <niko@kiirala.com>
+ *   Felipe Corrêa da Silva Sanches <felipe.sanches@gmail.com>
+ * 
+ * Copyright (C) 2006, 2007, 2008 Authors
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <glib.h>
+
+#include "attributes.h"
+#include "document.h"
+#include "sp-fecomponenttransfer.h"
+#include "sp-fecomponenttransfer-funcnode.h"
+#include "display/nr-filter-component-transfer.h"
+#include "xml/repr.h"
+#include "helper-fns.h"
+
+#define SP_MACROS_SILENT
+#include "macros.h"
+
+/* FeFuncNode class */
+
+static void sp_fefuncnode_class_init(SPFeFuncNodeClass *klass);
+static void sp_fefuncnode_init(SPFeFuncNode *fefuncnode);
+
+static void sp_fefuncnode_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);
+static void sp_fefuncnode_release(SPObject *object);
+static void sp_fefuncnode_set(SPObject *object, unsigned int key, gchar const *value);
+static void sp_fefuncnode_update(SPObject *object, SPCtx *ctx, guint flags);
+static Inkscape::XML::Node *sp_fefuncnode_write(SPObject *object, Inkscape::XML::Node *repr, guint flags);
+
+static SPObjectClass *feFuncNode_parent_class;
+
+GType
+sp_fefuncR_get_type()
+{
+    static GType fefuncnode_type = 0;
+
+    if (!fefuncnode_type) {
+        GTypeInfo fefuncnode_info = {
+            sizeof(SPFeFuncNodeClass),
+            NULL, NULL,
+            (GClassInitFunc) sp_fefuncnode_class_init,
+            NULL, NULL,
+            sizeof(SPFeFuncNode),
+            16,
+            (GInstanceInitFunc) sp_fefuncnode_init,
+            NULL,    /* value_table */
+        };
+        fefuncnode_type = g_type_register_static(SP_TYPE_OBJECT, "SPFeFuncR", &fefuncnode_info, (GTypeFlags)0);
+    }
+    return fefuncnode_type;
+}
+
+GType
+sp_fefuncG_get_type()
+{
+    static GType fefuncnode_type = 0;
+
+    if (!fefuncnode_type) {
+        GTypeInfo fefuncnode_info = {
+            sizeof(SPFeFuncNodeClass),
+            NULL, NULL,
+            (GClassInitFunc) sp_fefuncnode_class_init,
+            NULL, NULL,
+            sizeof(SPFeFuncNode),
+            16,
+            (GInstanceInitFunc) sp_fefuncnode_init,
+            NULL,    /* value_table */
+        };
+        fefuncnode_type = g_type_register_static(SP_TYPE_OBJECT, "SPFeFuncG", &fefuncnode_info, (GTypeFlags)0);
+    }
+    return fefuncnode_type;
+}
+
+GType
+sp_fefuncB_get_type()
+{
+    static GType fefuncnode_type = 0;
+
+    if (!fefuncnode_type) {
+        GTypeInfo fefuncnode_info = {
+            sizeof(SPFeFuncNodeClass),
+            NULL, NULL,
+            (GClassInitFunc) sp_fefuncnode_class_init,
+            NULL, NULL,
+            sizeof(SPFeFuncNode),
+            16,
+            (GInstanceInitFunc) sp_fefuncnode_init,
+            NULL,    /* value_table */
+        };
+        fefuncnode_type = g_type_register_static(SP_TYPE_OBJECT, "SPFeFuncB", &fefuncnode_info, (GTypeFlags)0);
+    }
+    return fefuncnode_type;
+}
+
+GType
+sp_fefuncA_get_type()
+{
+    static GType fefuncnode_type = 0;
+
+    if (!fefuncnode_type) {
+        GTypeInfo fefuncnode_info = {
+            sizeof(SPFeFuncNodeClass),
+            NULL, NULL,
+            (GClassInitFunc) sp_fefuncnode_class_init,
+            NULL, NULL,
+            sizeof(SPFeFuncNode),
+            16,
+            (GInstanceInitFunc) sp_fefuncnode_init,
+            NULL,    /* value_table */
+        };
+        fefuncnode_type = g_type_register_static(SP_TYPE_OBJECT, "SPFeFuncA", &fefuncnode_info, (GTypeFlags)0);
+    }
+    return fefuncnode_type;
+}
+
+static void
+sp_fefuncnode_class_init(SPFeFuncNodeClass *klass)
+{
+
+    SPObjectClass *sp_object_class = (SPObjectClass *)klass;
+
+    feFuncNode_parent_class = (SPObjectClass*)g_type_class_peek_parent(klass);
+
+    sp_object_class->build = sp_fefuncnode_build;
+    sp_object_class->release = sp_fefuncnode_release;
+    sp_object_class->write = sp_fefuncnode_write;
+    sp_object_class->set = sp_fefuncnode_set;
+    sp_object_class->update = sp_fefuncnode_update;
+}
+
+static void
+sp_fefuncnode_init(SPFeFuncNode *fefuncnode)
+{
+    fefuncnode->type = NR::COMPONENTTRANSFER_TYPE_IDENTITY;
+    //fefuncnode->tableValues = NULL;
+    fefuncnode->slope = 1;
+    fefuncnode->intercept = 0;
+    fefuncnode->amplitude = 1;
+    fefuncnode->exponent = 1;
+    fefuncnode->offset = 0;
+}
+
+/**
+ * Reads the Inkscape::XML::Node, and initializes SPDistantLight 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.
+ */
+static void
+sp_fefuncnode_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
+{
+    if (((SPObjectClass *) feFuncNode_parent_class)->build) {
+        ((SPObjectClass *) feFuncNode_parent_class)->build(object, document, repr);
+    }
+
+    //Read values of key attributes from XML nodes into object.
+    sp_object_read_attr(object, "type");
+    sp_object_read_attr(object, "tableValues");
+    sp_object_read_attr(object, "slope");
+    sp_object_read_attr(object, "intercept");
+    sp_object_read_attr(object, "amplitude");
+    sp_object_read_attr(object, "exponent");
+    sp_object_read_attr(object, "offset");
+    
+
+//is this necessary?
+    sp_document_add_resource(document, "fefuncnode", object); //maybe feFuncR, fefuncG, feFuncB and fefuncA ?
+}
+
+/**
+ * Drops any allocated memory.
+ */
+static void
+sp_fefuncnode_release(SPObject *object)
+{
+    //SPFeFuncNode *fefuncnode = SP_FEFUNCNODE(object);
+
+    if (SP_OBJECT_DOCUMENT(object)) {
+        /* Unregister ourselves */
+        sp_document_remove_resource(SP_OBJECT_DOCUMENT(object), "fefuncnode", SP_OBJECT(object));
+    }
+
+//TODO: release resources here
+}
+
+static NR::FilterComponentTransferType sp_feComponenttransfer_read_type(gchar const *value){
+    if (!value) return NR::COMPONENTTRANSFER_TYPE_ERROR; //type attribute is REQUIRED.
+    switch(value[0]){
+        case 'i':
+            if (strncmp(value, "identity", 8) == 0) return NR::COMPONENTTRANSFER_TYPE_IDENTITY;
+            break;
+        case 't':
+            if (strncmp(value, "table", 5) == 0) return NR::COMPONENTTRANSFER_TYPE_TABLE;
+            break;
+        case 'd':
+            if (strncmp(value, "discrete", 8) == 0) return NR::COMPONENTTRANSFER_TYPE_DISCRETE;
+            break;
+        case 'l':
+            if (strncmp(value, "linear", 6) == 0) return NR::COMPONENTTRANSFER_TYPE_LINEAR;
+            break;
+        case 'g':
+            if (strncmp(value, "gamma", 5) == 0) return NR::COMPONENTTRANSFER_TYPE_GAMMA;
+            break;
+    }
+    return NR::COMPONENTTRANSFER_TYPE_ERROR; //type attribute is REQUIRED.
+}
+
+/**
+ * Sets a specific value in the SPFeFuncNode.
+ */
+static void
+sp_fefuncnode_set(SPObject *object, unsigned int key, gchar const *value)
+{
+    SPFeFuncNode *feFuncNode = SP_FEFUNCNODE(object);
+    NR::FilterComponentTransferType type;
+    double read_num;
+    switch(key) {
+        case SP_ATTR_TYPE:
+            type = sp_feComponenttransfer_read_type(value);
+            if(type != feFuncNode->type) {
+                feFuncNode->type = type;
+                object->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            }
+            break;
+        case SP_ATTR_TABLEVALUES:
+            if (value){
+                feFuncNode->tableValues = helperfns_read_vector(value);
+                object->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            }
+            break;
+        case SP_ATTR_SLOPE:
+            read_num = helperfns_read_number(value);
+            if (read_num != feFuncNode->slope) {
+                feFuncNode->slope = read_num;
+                object->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            }
+            break;
+        case SP_ATTR_INTERCEPT:
+            read_num = helperfns_read_number(value);
+            if (read_num != feFuncNode->intercept) {
+                feFuncNode->intercept = read_num;
+                object->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            }
+            break;
+        case SP_ATTR_AMPLITUDE:
+            read_num = helperfns_read_number(value);
+            if (read_num != feFuncNode->amplitude) {
+                feFuncNode->amplitude = read_num;
+                object->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            }
+            break;
+        case SP_ATTR_EXPONENT:
+            read_num = helperfns_read_number(value);
+            if (read_num != feFuncNode->exponent) {
+                feFuncNode->exponent = read_num;
+                object->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            }
+            break;
+        case SP_ATTR_OFFSET:
+            read_num = helperfns_read_number(value);
+            if (read_num != feFuncNode->offset) {
+                feFuncNode->offset = read_num;
+                object->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
+            }
+            break;
+        default:
+            if (((SPObjectClass *) feFuncNode_parent_class)->set)
+                ((SPObjectClass *) feFuncNode_parent_class)->set(object, key, value);
+            break;
+    }
+}
+
+/**
+ *  * Receives update notifications.
+ *   */
+static void
+sp_fefuncnode_update(SPObject *object, SPCtx *ctx, guint flags)
+{
+    SPFeFuncNode *feFuncNode = SP_FEFUNCNODE(object);
+    (void)feFuncNode;
+
+    if (flags & SP_OBJECT_MODIFIED_FLAG) {
+        /* do something to trigger redisplay, updates? */
+        //TODO
+        //sp_object_read_attr(object, "azimuth");
+        //sp_object_read_attr(object, "elevation");
+    }
+
+    if (((SPObjectClass *) feFuncNode_parent_class)->update) {
+        ((SPObjectClass *) feFuncNode_parent_class)->update(object, ctx, flags);
+    }
+}
+
+/**
+ * Writes its settings to an incoming repr object, if any.
+ */
+static Inkscape::XML::Node *
+sp_fefuncnode_write(SPObject *object, Inkscape::XML::Node *repr, guint flags)
+{
+    SPFeFuncNode *fefuncnode = SP_FEFUNCNODE(object);
+
+    if (!repr) {
+        repr = SP_OBJECT_REPR(object)->duplicate(NULL); // FIXME
+    }
+
+    /*
+TODO: I'm not sure what to do here...
+
+    if (fefuncnode->azimuth_set)
+        sp_repr_set_css_double(repr, "azimuth", fefuncnode->azimuth);
+    if (fefuncnode->elevation_set)
+        sp_repr_set_css_double(repr, "elevation", fefuncnode->elevation);*/
+
+    if (((SPObjectClass *) feFuncNode_parent_class)->write) {
+        ((SPObjectClass *) feFuncNode_parent_class)->write(object, repr, flags);
+    }
+
+    return repr;
+}
+
+/*
+  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:encoding=utf-8:textwidth=99 :