src/filters/blend.cpp

	blend.cpp revision 51dc158adbe2c9d1df3c941cbf78b90944d1afc2
/** \file
 * SVG <feBlend> implementation.
 *
 */
/*
 * Authors:
 *   Hugo Rodrigues <haa.rodrigues@gmail.com>
 *   Niko Kiirala <niko@kiirala.com>
 *   Abhishek Sharma
 *
 * Copyright (C) 2006,2007 authors
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <string.h>

#include "sp-filter.h"
#include "filters/blend.h"
#include "attributes.h"
#include "svg/svg.h"
#include "xml/repr.h"

#include "display/nr-filter.h"
#include "display/nr-filter-primitive.h"
#include "display/nr-filter-blend.h"
#include "display/nr-filter-types.h"

/* FeBlend base class */
G_DEFINE_TYPE(SPFeBlend, sp_feBlend, SP_TYPE_FILTER_PRIMITIVE);

static void
sp_feBlend_class_init(SPFeBlendClass *klass)
{
}

CFeBlend::CFeBlend(SPFeBlend* blend) : CFilterPrimitive(blend) {
    this->spfeblend = blend;
}

CFeBlend::~CFeBlend() {
}

static void
sp_feBlend_init(SPFeBlend *feBlend)
{
    feBlend->cfeblend = new CFeBlend(feBlend);

    delete feBlend->cfilterprimitive;
    feBlend->cfilterprimitive = feBlend->cfeblend;
    feBlend->cobject = feBlend->cfeblend;

    feBlend->in2 = Inkscape::Filters::NR_FILTER_SLOT_NOT_SET;
}

/**
 * Reads the Inkscape::XML::Node, and initializes SPFeBlend 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 CFeBlend::build(SPDocument *document, Inkscape::XML::Node *repr) {
    SPFeBlend* object = this->spfeblend;

    SPFeBlend *blend = SP_FEBLEND(object);

    CFilterPrimitive::build(document, repr);

    /*LOAD ATTRIBUTES FROM REPR HERE*/
    object->readAttr( "mode" );
    object->readAttr( "in2" );

    /* Unlike normal in, in2 is required attribute. Make sure, we can call
     * it by some name. */
    if (blend->in2 == Inkscape::Filters::NR_FILTER_SLOT_NOT_SET ||
        blend->in2 == Inkscape::Filters::NR_FILTER_UNNAMED_SLOT)
    {
        SPFilter *parent = SP_FILTER(object->parent);
        blend->in2 = sp_filter_primitive_name_previous_out(blend);
        repr->setAttribute("in2", sp_filter_name_for_image(parent, blend->in2));
    }
}

/**
 * Drops any allocated memory.
 */
void CFeBlend::release() {
    CFilterPrimitive::release();
}

static Inkscape::Filters::FilterBlendMode sp_feBlend_readmode(gchar const *value)
{
    if (!value) return Inkscape::Filters::BLEND_NORMAL;
    switch (value[0]) {
        case 'n':
            if (strncmp(value, "normal", 6) == 0)
                return Inkscape::Filters::BLEND_NORMAL;
            break;
        case 'm':
            if (strncmp(value, "multiply", 8) == 0)
                return Inkscape::Filters::BLEND_MULTIPLY;
            break;
        case 's':
            if (strncmp(value, "screen", 6) == 0)
                return Inkscape::Filters::BLEND_SCREEN;
            break;
        case 'd':
            if (strncmp(value, "darken", 6) == 0)
                return Inkscape::Filters::BLEND_DARKEN;
            break;
        case 'l':
            if (strncmp(value, "lighten", 7) == 0)
                return Inkscape::Filters::BLEND_LIGHTEN;
            break;
        default:
            // do nothing by default
            break;
    }
    return Inkscape::Filters::BLEND_NORMAL;
}

/**
 * Sets a specific value in the SPFeBlend.
 */
void CFeBlend::set(unsigned int key, gchar const *value) {
    SPFeBlend* object = this->spfeblend;

    SPFeBlend *feBlend = SP_FEBLEND(object);
    (void)feBlend;

    Inkscape::Filters::FilterBlendMode mode;
    int input;
    switch(key) {
    /*DEAL WITH SETTING ATTRIBUTES HERE*/
        case SP_ATTR_MODE:
            mode = sp_feBlend_readmode(value);
            if (mode != feBlend->blend_mode) {
                feBlend->blend_mode = mode;
                object->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
            }
            break;
        case SP_ATTR_IN2:
            input = sp_filter_primitive_read_in(feBlend, value);
            if (input != feBlend->in2) {
                feBlend->in2 = input;
                object->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
            }
            break;
        default:
            CFilterPrimitive::set(key, value);
            break;
    }
}

/**
 * Receives update notifications.
 */
void CFeBlend::update(SPCtx *ctx, guint flags) {
    SPFeBlend* object = this->spfeblend;

    SPFeBlend *blend = SP_FEBLEND(object);

    if (flags & SP_OBJECT_MODIFIED_FLAG) {
        object->readAttr( "mode" );
        object->readAttr( "in2" );
    }

    /* Unlike normal in, in2 is required attribute. Make sure, we can call
     * it by some name. */
    if (blend->in2 == Inkscape::Filters::NR_FILTER_SLOT_NOT_SET ||
        blend->in2 == Inkscape::Filters::NR_FILTER_UNNAMED_SLOT)
    {
        SPFilter *parent = SP_FILTER(object->parent);
        blend->in2 = sp_filter_primitive_name_previous_out(blend);

        //XML Tree being used directly here while it shouldn't be.
        object->getRepr()->setAttribute("in2", sp_filter_name_for_image(parent, blend->in2));
    }

    CFilterPrimitive::update(ctx, flags);
}

/**
 * Writes its settings to an incoming repr object, if any.
 */
Inkscape::XML::Node* CFeBlend::write(Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags) {
    SPFeBlend* object = this->spfeblend;

    SPFeBlend *blend = SP_FEBLEND(object);
    SPFilter *parent = SP_FILTER(object->parent);

    if (!repr) {
        repr = doc->createElement("svg:feBlend");
    }

    gchar const *out_name = sp_filter_name_for_image(parent, blend->in2);
    if (out_name) {
        repr->setAttribute("in2", out_name);
    } else {
        SPObject *i = parent->children;
        while (i && i->next != object) i = i->next;
        SPFilterPrimitive *i_prim = SP_FILTER_PRIMITIVE(i);
        out_name = sp_filter_name_for_image(parent, i_prim->image_out);
        repr->setAttribute("in2", out_name);
        if (!out_name) {
            g_warning("Unable to set in2 for feBlend");
        }
    }

    char const *mode;
    switch(blend->blend_mode) {
        case Inkscape::Filters::BLEND_NORMAL:
            mode = "normal"; break;
        case Inkscape::Filters::BLEND_MULTIPLY:
            mode = "multiply"; break;
        case Inkscape::Filters::BLEND_SCREEN:
            mode = "screen"; break;
        case Inkscape::Filters::BLEND_DARKEN:
            mode = "darken"; break;
        case Inkscape::Filters::BLEND_LIGHTEN:
            mode = "lighten"; break;
        default:
            mode = 0;
    }
    repr->setAttribute("mode", mode);

    CFilterPrimitive::write(doc, repr, flags);

    return repr;
}

void CFeBlend::build_renderer(Inkscape::Filters::Filter* filter) {
    SPFeBlend* primitive = this->spfeblend;

    g_assert(primitive != NULL);
    g_assert(filter != NULL);

    SPFeBlend *sp_blend = SP_FEBLEND(primitive);

    int primitive_n = filter->add_primitive(Inkscape::Filters::NR_FILTER_BLEND);
    Inkscape::Filters::FilterPrimitive *nr_primitive = filter->get_primitive(primitive_n);
    Inkscape::Filters::FilterBlend *nr_blend = dynamic_cast<Inkscape::Filters::FilterBlend*>(nr_primitive);
    g_assert(nr_blend != NULL);

    sp_filter_primitive_renderer_common(primitive, nr_primitive);

    nr_blend->set_mode(sp_blend->blend_mode);
    nr_blend->set_input(1, sp_blend->in2);
}

/*
  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 :