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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* feDiffuseLighting renderer
*
* Authors:
* Niko Kiirala <niko@kiirala.com>
* Jean-Rene Reinhard <jr@komite.net>
* Krzysztof Kosiński <tweenk.pl@gmail.com>
*
* Copyright (C) 2007-2010 Authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#ifdef HAVE_CONFIG_H
# include "config.h" // only include where actually required!
#endif
#include <glib.h>
#include "display/cairo-templates.h"
#include "display/cairo-utils.h"
#include "display/nr-3dutils.h"
#include "display/nr-filter-diffuselighting.h"
#include "display/nr-filter-slot.h"
#include "display/nr-filter-units.h"
#include "display/nr-filter-utils.h"
#include "display/nr-light.h"
#include "svg/svg-color.h"
namespace Inkscape {
namespace Filters {
FilterDiffuseLighting::FilterDiffuseLighting()
: light_type(NO_LIGHT)
, diffuseConstant(1)
, surfaceScale(1)
, lighting_color(0xffffffff) {}
FilterDiffuseLighting::~FilterDiffuseLighting() = default;
struct DiffuseLight : public SurfaceSynth
{
DiffuseLight(cairo_surface_t *bumpmap, double scale, double kd)
: SurfaceSynth(bumpmap)
, _scale(scale)
, _kd(kd) {}
protected:
guint32 diffuseLighting(int x, int y, NR::Fvector const &light, NR::Fvector const &light_components)
{
NR::Fvector normal = surfaceNormalAt(x, y, _scale);
double k = _kd * NR::scalar_product(normal, light);
guint32 r = CLAMP_D_TO_U8(k * light_components[LIGHT_RED]);
guint32 g = CLAMP_D_TO_U8(k * light_components[LIGHT_GREEN]);
guint32 b = CLAMP_D_TO_U8(k * light_components[LIGHT_BLUE]);
ASSEMBLE_ARGB32(pxout, 255, r, g, b)
return pxout;
}
double _scale, _kd;
};
struct DiffuseDistantLight : public DiffuseLight
{
DiffuseDistantLight(cairo_surface_t *bumpmap, DistantLightData const &light, guint32 color,
double scale, double diffuse_constant)
: DiffuseLight(bumpmap, scale, diffuse_constant)
{
DistantLight dl(light, color);
dl.light_vector(_lightv);
dl.light_components(_light_components);
}
guint32 operator()(int x, int y)
{
return diffuseLighting(x, y, _lightv, _light_components);
}
private:
NR::Fvector _lightv, _light_components;
};
struct DiffusePointLight : public DiffuseLight
{
DiffusePointLight(cairo_surface_t *bumpmap, PointLightData const &light, guint32 color,
Geom::Affine const &trans, double scale, double diffuse_constant,
double x0, double y0, int device_scale)
: DiffuseLight(bumpmap, scale, diffuse_constant)
, _light(light, color, trans, device_scale)
, _x0(x0)
, _y0(y0)
{
_light.light_components(_light_components);
}
guint32 operator()(int x, int y)
{
NR::Fvector light;
_light.light_vector(light, _x0 + x, _y0 + y, _scale * alphaAt(x, y) / 255.0);
return diffuseLighting(x, y, light, _light_components);
}
private:
PointLight _light;
NR::Fvector _light_components;
double _x0, _y0;
};
struct DiffuseSpotLight : public DiffuseLight
{
DiffuseSpotLight(cairo_surface_t *bumpmap, SpotLightData const &light, guint32 color,
Geom::Affine const &trans, double scale, double diffuse_constant,
double x0, double y0, int device_scale)
: DiffuseLight(bumpmap, scale, diffuse_constant)
, _light(light, color, trans, device_scale)
, _x0(x0)
, _y0(y0) {}
guint32 operator()(int x, int y)
{
NR::Fvector light, light_components;
_light.light_vector(light, _x0 + x, _y0 + y, _scale * alphaAt(x, y)/255.0);
_light.light_components(light_components, light);
return diffuseLighting(x, y, light, light_components);
}
private:
SpotLight _light;
double _x0, _y0;
};
void FilterDiffuseLighting::render_cairo(FilterSlot &slot) const
{
cairo_surface_t *input = slot.getcairo(_input);
cairo_surface_t *out = ink_cairo_surface_create_same_size(input, CAIRO_CONTENT_COLOR_ALPHA);
double r = SP_RGBA32_R_F(lighting_color);
double g = SP_RGBA32_G_F(lighting_color);
double b = SP_RGBA32_B_F(lighting_color);
if (icc) {
unsigned char ru, gu, bu;
icc_color_to_sRGB(&*icc, &ru, &gu, &bu);
r = SP_COLOR_U_TO_F(ru);
g = SP_COLOR_U_TO_F(gu);
b = SP_COLOR_U_TO_F(bu);
}
// Only alpha channel of input is used, no need to check input color_interpolation_filter value.
// Lighting color is always defined in terms of sRGB, preconvert to linearRGB
// if color_interpolation_filters set to linearRGB (for efficiency assuming
// next filter primitive has same value of cif).
if (color_interpolation == SP_CSS_COLOR_INTERPOLATION_LINEARRGB) {
r = srgb_to_linear(r);
g = srgb_to_linear(g);
b = srgb_to_linear(b);
}
set_cairo_surface_ci(out, color_interpolation);
guint32 color = SP_RGBA32_F_COMPOSE(r, g, b, 1.0);
int device_scale = slot.get_device_scale();
Geom::Rect slot_area = slot.get_slot_area();
Geom::Point p = slot_area.min();
// trans has inverse y... so we can't just scale by device_scale! We must instead explicitly
// scale the point and spot light coordinates (as well as "scale").
Geom::Affine trans = slot.get_units().get_matrix_primitiveunits2pb();
double x0 = p.x(), y0 = p.y();
double scale = surfaceScale * trans.descrim() * device_scale;
switch (light_type) {
case DISTANT_LIGHT:
ink_cairo_surface_synthesize(out, DiffuseDistantLight(input, light.distant, color, scale, diffuseConstant));
break;
case POINT_LIGHT:
ink_cairo_surface_synthesize(out, DiffusePointLight(input, light.point, color, trans, scale, diffuseConstant, x0, y0, device_scale));
break;
case SPOT_LIGHT:
ink_cairo_surface_synthesize(out, DiffuseSpotLight(input, light.spot, color, trans, scale, diffuseConstant, x0, y0, device_scale));
break;
default: {
cairo_t *ct = cairo_create(out);
cairo_set_source_rgba(ct, 0, 0, 0, 1);
cairo_set_operator(ct, CAIRO_OPERATOR_SOURCE);
cairo_paint(ct);
cairo_destroy(ct);
break;
}
}
slot.set(_output, out);
cairo_surface_destroy(out);
}
void FilterDiffuseLighting::area_enlarge(Geom::IntRect &area, Geom::Affine const & /*trans*/) const
{
// TODO: support kernelUnitLength
// We expand the area by 1 in every direction to avoid artifacts on tile edges.
// However, it means that edge pixels will be incorrect.
area.expandBy(1);
}
double FilterDiffuseLighting::complexity(Geom::Affine const &) const
{
return 9.0;
}
} // 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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