1 #define __NR_FILTER_SLOT_CPP__
3 /*
4 * A container class for filter slots. Allows for simple getting and
5 * setting images in filter slots without having to bother with
6 * table indexes and such.
7 *
8 * Author:
9 * Niko Kiirala <niko@kiirala.com>
10 *
11 * Copyright (C) 2006,2007 Niko Kiirala
12 *
13 * Released under GNU GPL, read the file 'COPYING' for more information
14 */
16 #include <assert.h>
17 #include <string.h>
19 #include "display/nr-arena-item.h"
20 #include "display/nr-filter-types.h"
21 #include "display/nr-filter-slot.h"
22 #include "display/nr-filter-getalpha.h"
23 #include "display/nr-filter-units.h"
24 #include "display/pixblock-scaler.h"
25 #include "display/pixblock-transform.h"
26 #include "libnr/nr-pixblock.h"
27 #include "libnr/nr-blit.h"
29 __attribute__ ((const))
30 inline static int _max4(const double a, const double b,
31 const double c, const double d) {
32 double ret = a;
33 if (b > ret) ret = b;
34 if (c > ret) ret = c;
35 if (d > ret) ret = d;
36 return (int)round(ret);
37 }
39 __attribute__ ((const))
40 inline static int _min4(const double a, const double b,
41 const double c, const double d) {
42 double ret = a;
43 if (b < ret) ret = b;
44 if (c < ret) ret = c;
45 if (d < ret) ret = d;
46 return (int)round(ret);
47 }
49 __attribute__ ((const))
50 inline static int _max2(const double a, const double b) {
51 if (a > b)
52 return (int)round(a);
53 else
54 return (int)round(b);
55 }
57 __attribute__ ((const))
58 inline static int _min2(const double a, const double b) {
59 if (a > b)
60 return (int)round(b);
61 else
62 return (int)round(a);
63 }
65 namespace NR {
67 FilterSlot::FilterSlot(int slots, NRArenaItem const *item)
68 {
69 _slot_count = ((slots > 0) ? slots : 2);
70 _slot = new NRPixBlock*[_slot_count];
71 _slot_number = new int[_slot_count];
73 for (int i = 0 ; i < _slot_count ; i++) {
74 _slot[i] = NULL;
75 _slot_number[i] = NR_FILTER_SLOT_NOT_SET;
76 }
78 _last_out = -1;
80 _arena_item = item;
81 }
83 FilterSlot::~FilterSlot()
84 {
85 for (int i = 0 ; i < _slot_count ; i++) {
86 if (_slot[i]) {
87 nr_pixblock_release(_slot[i]);
88 delete _slot[i];
89 }
90 }
91 delete[] _slot;
92 delete[] _slot_number;
93 }
95 NRPixBlock *FilterSlot::get(int slot_nr)
96 {
97 int index = _get_index(slot_nr);
98 assert(index >= 0);
100 /* If we didn't have the specified image, but we could create it
101 * from the other information we have, let's do that */
102 if (_slot[index] == NULL
103 && (slot_nr == NR_FILTER_SOURCEALPHA
104 || slot_nr == NR_FILTER_BACKGROUNDIMAGE
105 || slot_nr == NR_FILTER_BACKGROUNDALPHA
106 || slot_nr == NR_FILTER_FILLPAINT
107 || slot_nr == NR_FILTER_STROKEPAINT))
108 {
109 /* If needed, fetch background */
110 if (slot_nr == NR_FILTER_BACKGROUNDIMAGE) {
111 NRPixBlock *pb;
112 pb = nr_arena_item_get_background(_arena_item);
113 if (pb) {
114 pb->empty = false;
115 this->set(NR_FILTER_BACKGROUNDIMAGE, pb);
116 } else {
117 NRPixBlock *source = this->get(NR_FILTER_SOURCEGRAPHIC);
118 pb = new NRPixBlock();
119 if (!pb) return NULL; // Allocation failed
120 nr_pixblock_setup_fast(pb, source->mode,
121 source->area.x0, source->area.y0,
122 source->area.x1, source->area.y1, true);
123 if (pb->size != NR_PIXBLOCK_SIZE_TINY && pb->data.px == NULL) {
124 // allocation failed
125 delete pb;
126 return NULL;
127 }
128 pb->empty = FALSE;
129 this->set(NR_FILTER_BACKGROUNDIMAGE, pb);
130 }
131 } else if (slot_nr == NR_FILTER_SOURCEALPHA) {
132 /* If only a alpha channel is needed, strip it from full image */
133 NRPixBlock *src = get(NR_FILTER_SOURCEGRAPHIC);
134 NRPixBlock *sa = filter_get_alpha(src);
135 set(NR_FILTER_SOURCEALPHA, sa);
136 } else if (slot_nr == NR_FILTER_BACKGROUNDALPHA) {
137 NRPixBlock *src = get(NR_FILTER_BACKGROUNDIMAGE);
138 NRPixBlock *ba = filter_get_alpha(src);
139 set(NR_FILTER_BACKGROUNDALPHA, ba);
140 } else if (slot_nr == NR_FILTER_FILLPAINT) {
141 /* When a paint is needed, fetch it from arena item */
142 // TODO
143 } else if (slot_nr == NR_FILTER_STROKEPAINT) {
144 // TODO
145 }
146 }
148 if (_slot[index]) {
149 _slot[index]->empty = false;
150 }
152 assert(slot_nr == NR_FILTER_SLOT_NOT_SET ||_slot_number[index] == slot_nr);
153 return _slot[index];
154 }
156 void FilterSlot::get_final(int slot_nr, NRPixBlock *result) {
157 NRPixBlock *final_usr = get(slot_nr);
158 Matrix trans = units.get_matrix_pb2display();
160 int size = (result->area.x1 - result->area.x0)
161 * (result->area.y1 - result->area.y0)
162 * NR_PIXBLOCK_BPP(result);
163 memset(NR_PIXBLOCK_PX(result), 0, size);
165 if (fabs(trans[1]) > 1e-6 || fabs(trans[2]) > 1e-6) {
166 transform_bicubic(result, final_usr, trans);
167 } else if (fabs(trans[0] - 1) > 1e-6 || fabs(trans[3] - 1) > 1e-6) {
168 scale_bicubic(result, final_usr);
169 } else {
170 nr_blit_pixblock_pixblock(result, final_usr);
171 }
172 }
174 void FilterSlot::set(int slot_nr, NRPixBlock *pb)
175 {
176 /* Unnamed slot is for saving filter primitive results, when parameter
177 * 'result' is not set. Only the filter immediately after this one
178 * can access unnamed results, so we don't have to worry about overwriting
179 * previous results in filter chain. On the other hand, we may not
180 * overwrite any other image with this one, because they might be
181 * accessed later on. */
182 int index = ((slot_nr != NR_FILTER_SLOT_NOT_SET)
183 ? _get_index(slot_nr)
184 : _get_index(NR_FILTER_UNNAMED_SLOT));
185 assert(index >= 0);
186 // Unnamed slot is only for NR::FilterSlot internal use.
187 assert(slot_nr != NR_FILTER_UNNAMED_SLOT);
188 assert(slot_nr == NR_FILTER_SLOT_NOT_SET ||_slot_number[index] == slot_nr);
190 if (slot_nr == NR_FILTER_SOURCEGRAPHIC || slot_nr == NR_FILTER_BACKGROUNDIMAGE) {
191 Matrix trans = units.get_matrix_display2pb();
192 if (fabs(trans[1]) > 1e-6 || fabs(trans[2]) > 1e-6) {
193 NRPixBlock *trans_pb = new NRPixBlock;
194 int x0 = pb->area.x0;
195 int y0 = pb->area.y0;
196 int x1 = pb->area.x1;
197 int y1 = pb->area.y1;
198 int min_x = _min4(trans[0] * x0 + trans[2] * y0 + trans[4],
199 trans[0] * x0 + trans[2] * y1 + trans[4],
200 trans[0] * x1 + trans[2] * y0 + trans[4],
201 trans[0] * x1 + trans[2] * y1 + trans[4]);
202 int max_x = _max4(trans[0] * x0 + trans[2] * y0 + trans[4],
203 trans[0] * x0 + trans[2] * y1 + trans[4],
204 trans[0] * x1 + trans[2] * y0 + trans[4],
205 trans[0] * x1 + trans[2] * y1 + trans[4]);
206 int min_y = _min4(trans[1] * x0 + trans[3] * y0 + trans[5],
207 trans[1] * x0 + trans[3] * y1 + trans[5],
208 trans[1] * x1 + trans[3] * y0 + trans[5],
209 trans[1] * x1 + trans[3] * y1 + trans[5]);
210 int max_y = _max4(trans[1] * x0 + trans[3] * y0 + trans[5],
211 trans[1] * x0 + trans[3] * y1 + trans[5],
212 trans[1] * x1 + trans[3] * y0 + trans[5],
213 trans[1] * x1 + trans[3] * y1 + trans[5]);
215 nr_pixblock_setup_fast(trans_pb, pb->mode,
216 min_x, min_y,
217 max_x, max_y, true);
218 if (trans_pb->size != NR_PIXBLOCK_SIZE_TINY && trans_pb->data.px == NULL) {
219 /* TODO: this gets hit occasionally. Worst case scenario:
220 * images are exported in horizontal stripes. One stripe
221 * is not too high, but can get thousands of pixels wide.
222 * Rotate this 45 degrees -> _huge_ image */
223 g_warning("Memory allocation failed in NR::FilterSlot::set (transform)");
224 return;
225 }
226 transform_bicubic(trans_pb, pb, trans);
227 nr_pixblock_release(pb);
228 delete pb;
229 pb = trans_pb;
230 } else if (fabs(trans[0] - 1) > 1e-6 || fabs(trans[3] - 1) > 1e-6) {
231 NRPixBlock *trans_pb = new NRPixBlock;
233 int x0 = pb->area.x0;
234 int y0 = pb->area.y0;
235 int x1 = pb->area.x1;
236 int y1 = pb->area.y1;
237 int min_x = _min2(trans[0] * x0 + trans[4],
238 trans[0] * x1 + trans[4]);
239 int max_x = _max2(trans[0] * x0 + trans[4],
240 trans[0] * x1 + trans[4]);
241 int min_y = _min2(trans[3] * y0 + trans[5],
242 trans[3] * y1 + trans[5]);
243 int max_y = _max2(trans[3] * y0 + trans[5],
244 trans[3] * y1 + trans[5]);
246 nr_pixblock_setup_fast(trans_pb, pb->mode,
247 min_x, min_y, max_x, max_y, true);
248 if (trans_pb->size != NR_PIXBLOCK_SIZE_TINY && trans_pb->data.px == NULL) {
249 g_warning("Memory allocation failed in NR::FilterSlot::set (scaling)");
250 return;
251 }
252 scale_bicubic(trans_pb, pb);
253 nr_pixblock_release(pb);
254 delete pb;
255 pb = trans_pb;
256 }
257 }
259 if(_slot[index]) {
260 nr_pixblock_release(_slot[index]);
261 delete _slot[index];
262 }
263 _slot[index] = pb;
264 _last_out = index;
265 }
267 int FilterSlot::get_slot_count()
268 {
269 int seek = _slot_count;
270 do {
271 seek--;
272 } while (!_slot[seek] && _slot_number[seek] == NR_FILTER_SLOT_NOT_SET);
274 return seek + 1;
275 }
277 NRArenaItem const* FilterSlot::get_arenaitem()
278 {
279 return _arena_item;
280 }
282 int FilterSlot::_get_index(int slot_nr)
283 {
284 assert(slot_nr >= 0 ||
285 slot_nr == NR_FILTER_SLOT_NOT_SET ||
286 slot_nr == NR_FILTER_SOURCEGRAPHIC ||
287 slot_nr == NR_FILTER_SOURCEALPHA ||
288 slot_nr == NR_FILTER_BACKGROUNDIMAGE ||
289 slot_nr == NR_FILTER_BACKGROUNDALPHA ||
290 slot_nr == NR_FILTER_FILLPAINT ||
291 slot_nr == NR_FILTER_STROKEPAINT ||
292 slot_nr == NR_FILTER_UNNAMED_SLOT);
294 int index = -1;
295 if (slot_nr == NR_FILTER_SLOT_NOT_SET) {
296 return _last_out;
297 }
298 /* Search, if the slot already exists */
299 for (int i = 0 ; i < _slot_count ; i++) {
300 if (_slot_number[i] == slot_nr) {
301 index = i;
302 break;
303 }
304 }
306 /* If the slot doesn't already exist, create it */
307 if (index == -1) {
308 int seek = _slot_count;
309 do {
310 seek--;
311 } while ((seek >= 0) && (_slot_number[seek] == NR_FILTER_SLOT_NOT_SET));
312 /* If there is no space for more slots, create more space */
313 if (seek == _slot_count - 1) {
314 NRPixBlock **new_slot = new NRPixBlock*[_slot_count * 2];
315 int *new_number = new int[_slot_count * 2];
316 for (int i = 0 ; i < _slot_count ; i++) {
317 new_slot[i] = _slot[i];
318 new_number[i] = _slot_number[i];
319 }
320 for (int i = _slot_count ; i < _slot_count * 2 ; i++) {
321 new_slot[i] = NULL;
322 new_number[i] = NR_FILTER_SLOT_NOT_SET;
323 }
324 delete[] _slot;
325 delete[] _slot_number;
326 _slot = new_slot;
327 _slot_number = new_number;
328 _slot_count *= 2;
329 }
330 /* Now that there is space, create the slot */
331 _slot_number[seek + 1] = slot_nr;
332 index = seek + 1;
333 }
334 return index;
335 }
337 void FilterSlot::set_units(FilterUnits const &units) {
338 this->units = units;
339 }
341 }
343 /*
344 Local Variables:
345 mode:c++
346 c-file-style:"stroustrup"
347 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
348 indent-tabs-mode:nil
349 fill-column:99
350 End:
351 */
352 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :