1 /*
2 * feDisplacementMap filter primitive renderer
3 *
4 * Authors:
5 * Felipe CorrĂȘa da Silva Sanches <felipe.sanches@gmail.com>
6 *
7 * Copyright (C) 2007 authors
8 *
9 * Released under GNU GPL, read the file 'COPYING' for more information
10 */
12 #include "display/nr-filter-displacement-map.h"
13 #include "display/nr-filter-types.h"
14 #include "display/nr-filter-units.h"
15 #include "libnr/nr-pixops.h"
17 namespace NR {
19 FilterDisplacementMap::FilterDisplacementMap()
20 {}
22 FilterPrimitive * FilterDisplacementMap::create() {
23 return new FilterDisplacementMap();
24 }
26 FilterDisplacementMap::~FilterDisplacementMap()
27 {}
29 int FilterDisplacementMap::render(FilterSlot &slot, FilterUnits const &units) {
30 NRPixBlock *texture = slot.get(_input);
31 NRPixBlock *map = slot.get(_input2);
33 // Bail out if either one of source images is missing
34 if (!map || !texture) {
35 g_warning("Missing source image for feDisplacementMap (map=%d texture=%d)", _input, _input2);
36 return 1;
37 }
39 //TODO: check whether do we really need this check:
40 if (map->area.x1 <= map->area.x0 || map->area.y1 <= map->area.y0) return 0; //nothing to do!
42 NRPixBlock *out = new NRPixBlock;
44 //are these checks really necessary?
45 if (out_w > map->area.x1 - out_x0) out_w = map->area.x1 - out_x0;
46 if (out_h > map->area.y1 - out_y0) out_h = map->area.y1 - out_y0;
47 if (out_x0 < map->area.x0){
48 out_x0 = map->area.x0;
49 out_w -= (map->area.x0 - out_x0);
50 }
51 if (out_y0 < map->area.y0){
52 out_y0 = map->area.y0;
53 out_h -= (map->area.y0 - out_y0);
54 }
56 out->area.x0 = out_x0;
57 out->area.y0 = out_y0;
58 out->area.x1 = out_x0 + out_w;
59 out->area.y1 = out_y0 + out_h;
61 nr_pixblock_setup_fast(out, map->mode, out->area.x0, out->area.y0, out->area.x1, out->area.y1, true);
63 unsigned char *map_data = NR_PIXBLOCK_PX(map);
64 unsigned char *texture_data = NR_PIXBLOCK_PX(texture);
65 unsigned char *out_data = NR_PIXBLOCK_PX(out);
66 int x, y;
67 int in_w = map->area.x1 - map->area.x0;
68 int in_h = map->area.y1 - map->area.y0;
69 double coordx, coordy;
71 for (x=0; x < out_w; x++){
72 for (y=0; y < out_h; y++){
73 if (x+out_x0-map->area.x0 >= 0 &&
74 x+out_x0-map->area.x0 < in_w &&
75 y+out_y0-map->area.y0 >= 0 &&
76 y+out_y0-map->area.y0 < in_h){
78 coordx = out_x0 - map->area.x0 + x + scale * ( double(map_data[4*((x+out_x0-map->area.x0) + in_w*(y+out_y0-map->area.y0)) + Xchannel])/255 - 0.5);
79 coordy = out_y0 - map->area.y0 + y + scale * ( double(map_data[4*((x+out_x0-map->area.x0) + in_w*(y+out_y0-map->area.y0)) + Ychannel])/255 - 0.5);
81 if (coordx>=0 && coordx<in_w && coordy>=0 && coordy<in_h){
82 out_data[4*(x + out_w*y)] = texture_data[4*(int(coordx) + int(coordy)*in_w)];
83 out_data[4*(x + out_w*y) + 1] = texture_data[4*(int(coordx) + int(coordy)*in_w) + 1];
84 out_data[4*(x + out_w*y) + 2] = texture_data[4*(int(coordx) + int(coordy)*in_w) + 2];
85 out_data[4*(x + out_w*y) + 3] = texture_data[4*(int(coordx) + int(coordy)*in_w) + 3];
86 } else {
87 out_data[4*(x + out_w*y)] = 255;
88 out_data[4*(x + out_w*y) + 1] = 255;
89 out_data[4*(x + out_w*y) + 2] = 255;
90 out_data[4*(x + out_w*y) + 3] = 0;
91 }
92 }
93 }
94 }
96 out->empty = FALSE;
97 slot.set(_output, out);
98 return 0;
99 }
101 void FilterDisplacementMap::set_input(int slot) {
102 _input = slot;
103 }
105 void FilterDisplacementMap::set_scale(double s) {
106 scale = s;
107 }
109 void FilterDisplacementMap::set_input(int input, int slot) {
110 if (input == 0) _input = slot;
111 if (input == 1) _input2 = slot;
112 }
114 void FilterDisplacementMap::set_channel_selector(int s, int channel) {
115 if (channel>3 || channel <0) {
116 g_warning("Selected an invalid channel value. (%d)", channel);
117 return;
118 }
120 if (s == 0) Xchannel = channel;
121 if (s == 1) Ychannel = channel;
122 }
124 void FilterDisplacementMap::area_enlarge(NRRectL &area, Matrix const &trans)
125 {
126 out_x0 = area.x0;
127 out_y0 = area.y0;
128 out_w = area.x1 - area.x0;
129 out_h = area.y1 - area.y0;
130 area.x0 -= (int)(scale/2);
131 area.x1 += (int)(scale/2);
132 area.y0 -= (int)(scale/2);
133 area.y1 += (int)(scale/2);
134 }
136 FilterTraits FilterDisplacementMap::get_input_traits() {
137 return TRAIT_PARALLER;
138 }
140 } /* namespace NR */
142 /*
143 Local Variables:
144 mode:c++
145 c-file-style:"stroustrup"
146 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
147 indent-tabs-mode:nil
148 fill-column:99
149 End:
150 */
151 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :