nr-filter-diffuselighting.cpp revision 9ae23d42ab800ee4da98dc3abe083fd6770a718b
/*
* feDiffuseLighting renderer
*
* Authors:
* Niko Kiirala <niko@kiirala.com>
* Jean-Rene Reinhard <jr@komite.net>
*
* Copyright (C) 2007 authors
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include <glib/gmessages.h>
#include "display/nr-3dutils.h"
#include "display/nr-arena-item.h"
#include "display/nr-filter-diffuselighting.h"
#include "display/nr-filter-getalpha.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 "libnr/nr-blit.h"
#include "libnr/nr-pixblock.h"
#include "libnr/nr-rect-l.h"
#include "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()
{}
int FilterDiffuseLighting::render(FilterSlot &slot, FilterUnits const &units) {
NRPixBlock *in = slot.get(_input);
if (!in) {
g_warning("Missing source image for feDiffuseLighting (in=%d)", _input);
return 1;
}
NRPixBlock *out = new NRPixBlock;
int w = in->area.x1 - in->area.x0;
int h = in->area.y1 - in->area.y0;
int x0 = in->area.x0;
int y0 = in->area.y0;
int i, j;
//As long as FilterRes and kernel unit is not supported we hardcode the
//default value
int dx = 1; //TODO setup
int dy = 1; //TODO setup
//surface scale
Geom::Matrix trans = units.get_matrix_primitiveunits2pb();
gdouble ss = surfaceScale * trans[0];
gdouble kd = diffuseConstant; //diffuse lighting constant
NR::Fvector L, N, LC;
gdouble inter;
nr_pixblock_setup_fast(out, in->mode,
in->area.x0, in->area.y0, in->area.x1, in->area.y1,
true);
unsigned char *data_i = NR_PIXBLOCK_PX (in);
unsigned char *data_o = NR_PIXBLOCK_PX (out);
//No light, nothing to do
switch (light_type) {
case DISTANT_LIGHT:
//the light vector is constant
{
DistantLight *dl = new DistantLight(light.distant, lighting_color);
dl->light_vector(L);
dl->light_components(LC);
//finish the work
for (i = 0, j = 0; i < w*h; i++) {
NR::compute_surface_normal(N, ss, in, i / w, i % w, dx, dy);
inter = kd * NR::scalar_product(N, L);
data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_RED]); // CLAMP includes rounding!
data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_GREEN]);
data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_BLUE]);
data_o[j++] = 255;
}
out->empty = FALSE;
delete dl;
}
break;
case POINT_LIGHT:
{
PointLight *pl = new PointLight(light.point, lighting_color, trans);
pl->light_components(LC);
//TODO we need a reference to the filter to determine primitiveUnits
//if objectBoundingBox is used, use a different matrix for light_vector
// UPDATE: trans is now correct matrix from primitiveUnits to
// pixblock coordinates
//finish the work
for (i = 0, j = 0; i < w*h; i++) {
NR::compute_surface_normal(N, ss, in, i / w, i % w, dx, dy);
pl->light_vector(L,
i % w + x0,
i / w + y0,
ss * (double) data_i[4*i+3]/ 255);
inter = kd * NR::scalar_product(N, L);
data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_RED]);
data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_GREEN]);
data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_BLUE]);
data_o[j++] = 255;
}
out->empty = FALSE;
delete pl;
}
break;
case SPOT_LIGHT:
{
SpotLight *sl = new SpotLight(light.spot, lighting_color, trans);
//TODO we need a reference to the filter to determine primitiveUnits
//if objectBoundingBox is used, use a different matrix for light_vector
// UPDATE: trans is now correct matrix from primitiveUnits to
// pixblock coordinates
//finish the work
for (i = 0, j = 0; i < w*h; i++) {
NR::compute_surface_normal(N, ss, in, i / w, i % w, dx, dy);
sl->light_vector(L,
i % w + x0,
i / w + y0,
ss * (double) data_i[4*i+3]/ 255);
sl->light_components(LC, L);
inter = kd * NR::scalar_product(N, L);
data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_RED]);
data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_GREEN]);
data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_BLUE]);
data_o[j++] = 255;
}
out->empty = FALSE;
delete sl;
}
break;
//else unknown light source, doing nothing
case NO_LIGHT:
default:
{
if (light_type != NO_LIGHT)
g_warning("unknown light source %d", light_type);
for (i = 0; i < w*h; i++) {
data_o[4*i+3] = 255;
}
out->empty = false;
}
}
//finishing
slot.set(_output, out);
//nr_pixblock_release(in);
//delete in;
return 0;
}
void FilterDiffuseLighting::area_enlarge(NRRectL &area, Geom::Matrix const &trans)
{
// TODO: support kernelUnitLength
double scalex = std::fabs(trans[0]) + std::fabs(trans[1]);
double scaley = std::fabs(trans[2]) + std::fabs(trans[3]);
//FIXME: no +2 should be there!... (noticable only for big scales at big zoom factor)
area.x0 -= (int)(scalex) + 2;
area.x1 += (int)(scalex) + 2;
area.y0 -= (int)(scaley) + 2;
area.y1 += (int)(scaley) + 2;
}
FilterTraits FilterDiffuseLighting::get_input_traits() {
return TRAIT_PARALLER;
}
} /* 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:encoding=utf-8:textwidth=99 :