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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* feColorMatrix filter primitive renderer
*
* Authors:
* Felipe Corrêa da Silva Sanches <juca@members.fsf.org>
* Jasper van de Gronde <th.v.d.gronde@hccnet.nl>
*
* Copyright (C) 2007 authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <cmath>
#include <algorithm>
#include "display/cairo-templates.h"
#include "display/cairo-utils.h"
#include "display/nr-filter-colormatrix.h"
#include "display/nr-filter-slot.h"
#include <2geom/math-utils.h>
namespace Inkscape {
namespace Filters {
FilterColorMatrix::FilterColorMatrix()
= default;
FilterPrimitive * FilterColorMatrix::create() {
return new FilterColorMatrix();
}
FilterColorMatrix::~FilterColorMatrix()
= default;
FilterColorMatrix::ColorMatrixMatrix::ColorMatrixMatrix(std::vector<double> const &values) {
unsigned limit = std::min(static_cast<size_t>(20), values.size());
for (unsigned i = 0; i < limit; ++i) {
if (i % 5 == 4) {
_v[i] = round(values[i]*255*255);
} else {
_v[i] = round(values[i]*255);
}
}
for (unsigned i = limit; i < 20; ++i) {
_v[i] = (i % 6 == 0) ? 255 : 0;
}
}
guint32 FilterColorMatrix::ColorMatrixMatrix::operator()(guint32 in) {
EXTRACT_ARGB32(in, a, r, g, b)
// we need to un-premultiply alpha values for this type of matrix
// TODO: unpremul can be ignored if there is an identity mapping on the alpha channel
if (a != 0) {
r = unpremul_alpha(r, a);
g = unpremul_alpha(g, a);
b = unpremul_alpha(b, a);
}
gint32 ro = r*_v[0] + g*_v[1] + b*_v[2] + a*_v[3] + _v[4];
gint32 go = r*_v[5] + g*_v[6] + b*_v[7] + a*_v[8] + _v[9];
gint32 bo = r*_v[10] + g*_v[11] + b*_v[12] + a*_v[13] + _v[14];
gint32 ao = r*_v[15] + g*_v[16] + b*_v[17] + a*_v[18] + _v[19];
ro = (pxclamp(ro, 0, 255*255) + 127) / 255;
go = (pxclamp(go, 0, 255*255) + 127) / 255;
bo = (pxclamp(bo, 0, 255*255) + 127) / 255;
ao = (pxclamp(ao, 0, 255*255) + 127) / 255;
ro = premul_alpha(ro, ao);
go = premul_alpha(go, ao);
bo = premul_alpha(bo, ao);
ASSEMBLE_ARGB32(pxout, ao, ro, go, bo)
return pxout;
}
struct ColorMatrixSaturate {
ColorMatrixSaturate(double v_in) {
// clamp parameter instead of clamping color values
double v = CLAMP(v_in, 0.0, 1.0);
_v[0] = 0.213+0.787*v; _v[1] = 0.715-0.715*v; _v[2] = 0.072-0.072*v;
_v[3] = 0.213-0.213*v; _v[4] = 0.715+0.285*v; _v[5] = 0.072-0.072*v;
_v[6] = 0.213-0.213*v; _v[7] = 0.715-0.715*v; _v[8] = 0.072+0.928*v;
}
guint32 operator()(guint32 in) {
EXTRACT_ARGB32(in, a, r, g, b)
// Note: this cannot be done in fixed point, because the loss of precision
// causes overflow for some values of v
guint32 ro = r*_v[0] + g*_v[1] + b*_v[2] + 0.5;
guint32 go = r*_v[3] + g*_v[4] + b*_v[5] + 0.5;
guint32 bo = r*_v[6] + g*_v[7] + b*_v[8] + 0.5;
ASSEMBLE_ARGB32(pxout, a, ro, go, bo)
return pxout;
}
private:
double _v[9];
};
struct ColorMatrixHueRotate {
ColorMatrixHueRotate(double v) {
double sinhue, coshue;
Geom::sincos(v * M_PI/180.0, sinhue, coshue);
_v[0] = round((0.213 +0.787*coshue -0.213*sinhue)*255);
_v[1] = round((0.715 -0.715*coshue -0.715*sinhue)*255);
_v[2] = round((0.072 -0.072*coshue +0.928*sinhue)*255);
_v[3] = round((0.213 -0.213*coshue +0.143*sinhue)*255);
_v[4] = round((0.715 +0.285*coshue +0.140*sinhue)*255);
_v[5] = round((0.072 -0.072*coshue -0.283*sinhue)*255);
_v[6] = round((0.213 -0.213*coshue -0.787*sinhue)*255);
_v[7] = round((0.715 -0.715*coshue +0.715*sinhue)*255);
_v[8] = round((0.072 +0.928*coshue +0.072*sinhue)*255);
}
guint32 operator()(guint32 in) {
EXTRACT_ARGB32(in, a, r, g, b)
gint32 maxpx = a*255;
gint32 ro = r*_v[0] + g*_v[1] + b*_v[2];
gint32 go = r*_v[3] + g*_v[4] + b*_v[5];
gint32 bo = r*_v[6] + g*_v[7] + b*_v[8];
ro = (pxclamp(ro, 0, maxpx) + 127) / 255;
go = (pxclamp(go, 0, maxpx) + 127) / 255;
bo = (pxclamp(bo, 0, maxpx) + 127) / 255;
ASSEMBLE_ARGB32(pxout, a, ro, go, bo)
return pxout;
}
private:
gint32 _v[9];
};
struct ColorMatrixLuminanceToAlpha {
guint32 operator()(guint32 in) {
// original computation in double: r*0.2125 + g*0.7154 + b*0.0721
EXTRACT_ARGB32(in, a, r, g, b)
// unpremultiply color values
if (a != 0) {
r = unpremul_alpha(r, a);
g = unpremul_alpha(g, a);
b = unpremul_alpha(b, a);
}
guint32 ao = r*54 + g*182 + b*18;
return ((ao + 127) / 255) << 24;
}
};
void FilterColorMatrix::render_cairo(FilterSlot &slot)
{
cairo_surface_t *input = slot.getcairo(_input);
cairo_surface_t *out = nullptr;
// 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.
SPColorInterpolation ci_fp = SP_CSS_COLOR_INTERPOLATION_AUTO;
if( _style ) {
ci_fp = (SPColorInterpolation)_style->color_interpolation_filters.computed;
}
set_cairo_surface_ci( input, ci_fp );
if (type == COLORMATRIX_LUMINANCETOALPHA) {
out = ink_cairo_surface_create_same_size(input, CAIRO_CONTENT_ALPHA);
} else {
out = ink_cairo_surface_create_same_size(input, CAIRO_CONTENT_COLOR_ALPHA);
// Set ci to that used for computation
set_cairo_surface_ci(out, ci_fp);
}
switch (type) {
case COLORMATRIX_MATRIX:
ink_cairo_surface_filter(input, out, FilterColorMatrix::ColorMatrixMatrix(values));
break;
case COLORMATRIX_SATURATE:
ink_cairo_surface_filter(input, out, ColorMatrixSaturate(value));
break;
case COLORMATRIX_HUEROTATE:
ink_cairo_surface_filter(input, out, ColorMatrixHueRotate(value));
break;
case COLORMATRIX_LUMINANCETOALPHA:
ink_cairo_surface_filter(input, out, ColorMatrixLuminanceToAlpha());
break;
case COLORMATRIX_ENDTYPE:
default:
break;
}
slot.set(_output, out);
cairo_surface_destroy(out);
}
bool FilterColorMatrix::can_handle_affine(Geom::Affine const &)
{
return true;
}
double FilterColorMatrix::complexity(Geom::Affine const &)
{
return 2.0;
}
void FilterColorMatrix::set_type(FilterColorMatrixType t){
type = t;
}
void FilterColorMatrix::set_value(gdouble v){
value = v;
}
void FilterColorMatrix::set_values(std::vector<gdouble> const &v){
values = v;
}
} /* 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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