1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
// 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-icc-color.h"
#include "svg/svg-color.h"
namespace Inkscape {
namespace Filters {
FilterDiffuseLighting::FilterDiffuseLighting()
{
light_type = NO_LIGHT;
diffuseConstant = 1;
surfaceScale = 1;
lighting_color = 0xffffffff;
}
FilterPrimitive * FilterDiffuseLighting::create() {
return new FilterDiffuseLighting();
}
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, SPFeDistantLight *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, SPFePointLight *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, SPFeSpotLight *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)
{
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) {
guchar 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.
SPColorInterpolation ci_fp = SP_CSS_COLOR_INTERPOLATION_AUTO;
if( _style ) {
ci_fp = (SPColorInterpolation)_style->color_interpolation_filters.computed;
// 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( ci_fp == 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, ci_fp );
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[Geom::X], y0 = p[Geom::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::set_icc(SVGICCColor *icc_color) {
icc = icc_color;
}
void FilterDiffuseLighting::area_enlarge(Geom::IntRect &area, Geom::Affine const & /*trans*/)
{
// 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 &)
{
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 :
|
