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// SPDX-License-Identifier: GPL-2.0-or-later
/** @file
* SVG feBlend renderer
*//*
* "This filter composites two objects together using commonly used
* imaging software blending modes. It performs a pixel-wise combination
* of two input images."
* http://www.w3.org/TR/SVG11/filters.html#feBlend
*
* Authors:
* Niko Kiirala <niko@kiirala.com>
* Jasper van de Gronde <th.v.d.gronde@hccnet.nl>
* Krzysztof Kosiński <tweenk.pl@gmail.com>
*
* Copyright (C) 2007-2008 authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <glibmm.h>
#include "display/cairo-templates.h"
#include "display/cairo-utils.h"
#include "display/nr-filter-blend.h"
#include "display/nr-filter-primitive.h"
#include "display/nr-filter-slot.h"
#include "display/nr-filter-types.h"
namespace Inkscape {
namespace Filters {
std::set<SPBlendMode> const FilterBlend::_valid_modes {
// clang-format off
SP_CSS_BLEND_NORMAL, SP_CSS_BLEND_MULTIPLY,
SP_CSS_BLEND_SCREEN, SP_CSS_BLEND_DARKEN,
SP_CSS_BLEND_LIGHTEN, SP_CSS_BLEND_OVERLAY,
SP_CSS_BLEND_COLORDODGE, SP_CSS_BLEND_COLORBURN,
SP_CSS_BLEND_HARDLIGHT, SP_CSS_BLEND_SOFTLIGHT,
SP_CSS_BLEND_DIFFERENCE, SP_CSS_BLEND_EXCLUSION,
SP_CSS_BLEND_HUE, SP_CSS_BLEND_SATURATION,
SP_CSS_BLEND_COLOR, SP_CSS_BLEND_LUMINOSITY
// clang-format on
};
FilterBlend::FilterBlend()
: _blend_mode(SP_CSS_BLEND_NORMAL)
, _input2(NR_FILTER_SLOT_NOT_SET)
{
}
FilterBlend::~FilterBlend() = default;
static inline cairo_operator_t get_cairo_op(SPBlendMode _blend_mode)
{
switch (_blend_mode) {
case SP_CSS_BLEND_MULTIPLY:
return CAIRO_OPERATOR_MULTIPLY;
case SP_CSS_BLEND_SCREEN:
return CAIRO_OPERATOR_SCREEN;
case SP_CSS_BLEND_DARKEN:
return CAIRO_OPERATOR_DARKEN;
case SP_CSS_BLEND_LIGHTEN:
return CAIRO_OPERATOR_LIGHTEN;
// New in CSS Compositing and Blending Level 1
case SP_CSS_BLEND_OVERLAY:
return CAIRO_OPERATOR_OVERLAY;
case SP_CSS_BLEND_COLORDODGE:
return CAIRO_OPERATOR_COLOR_DODGE;
case SP_CSS_BLEND_COLORBURN:
return CAIRO_OPERATOR_COLOR_BURN;
case SP_CSS_BLEND_HARDLIGHT:
return CAIRO_OPERATOR_HARD_LIGHT;
case SP_CSS_BLEND_SOFTLIGHT:
return CAIRO_OPERATOR_SOFT_LIGHT;
case SP_CSS_BLEND_DIFFERENCE:
return CAIRO_OPERATOR_DIFFERENCE;
case SP_CSS_BLEND_EXCLUSION:
return CAIRO_OPERATOR_EXCLUSION;
case SP_CSS_BLEND_HUE:
return CAIRO_OPERATOR_HSL_HUE;
case SP_CSS_BLEND_SATURATION:
return CAIRO_OPERATOR_HSL_SATURATION;
case SP_CSS_BLEND_COLOR:
return CAIRO_OPERATOR_HSL_COLOR;
case SP_CSS_BLEND_LUMINOSITY:
return CAIRO_OPERATOR_HSL_LUMINOSITY;
case SP_CSS_BLEND_NORMAL:
default:
return CAIRO_OPERATOR_OVER;
}
}
void FilterBlend::render_cairo(FilterSlot &slot) const
{
cairo_surface_t *input1 = slot.getcairo(_input);
cairo_surface_t *input2 = slot.getcairo(_input2);
// We may need to transform input surface to correct color interpolation space. The input surface
// might be used as input to another primitive but it is likely that all the primitives in a given
// filter use the same color interpolation space so we don't copy the input before converting.
set_cairo_surface_ci(input1, color_interpolation);
set_cairo_surface_ci(input2, color_interpolation);
// input2 is the "background" image
// out should be ARGB32 if any of the inputs is ARGB32
cairo_surface_t *out = ink_cairo_surface_create_output(input1, input2);
set_cairo_surface_ci(out, color_interpolation);
ink_cairo_surface_blit(input2, out);
cairo_t *out_ct = cairo_create(out);
cairo_set_source_surface(out_ct, input1, 0, 0);
// All of the blend modes are implemented in Cairo as of 1.10.
// For a detailed description, see:
// http://cairographics.org/operators/
cairo_set_operator(out_ct, get_cairo_op(_blend_mode));
cairo_paint(out_ct);
cairo_destroy(out_ct);
slot.set(_output, out);
cairo_surface_destroy(out);
}
bool FilterBlend::can_handle_affine(Geom::Affine const &) const
{
// blend is a per-pixel primitive and is immutable under transformations
return true;
}
double FilterBlend::complexity(Geom::Affine const &) const
{
return 1.1;
}
bool FilterBlend::uses_background() const
{
return _input == NR_FILTER_BACKGROUNDIMAGE || _input == NR_FILTER_BACKGROUNDALPHA ||
_input2 == NR_FILTER_BACKGROUNDIMAGE || _input2 == NR_FILTER_BACKGROUNDALPHA;
}
void FilterBlend::set_input(int slot)
{
_input = slot;
}
void FilterBlend::set_input(int input, int slot)
{
if (input == 0) _input = slot;
if (input == 1) _input2 = slot;
}
void FilterBlend::set_mode(SPBlendMode mode)
{
if (_valid_modes.count(mode)) {
_blend_mode = mode;
}
}
} /* namespace Filters */
} /* namespace Inkscape */
/*
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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