1 #define __NR_ARENA_IMAGE_C__
3 /*
4 * RGBA display list system for inkscape
5 *
6 * Author:
7 * Lauris Kaplinski <lauris@kaplinski.com>
8 *
9 * Copyright (C) 2001-2002 Lauris Kaplinski
10 * Copyright (C) 2001 Ximian, Inc.
11 *
12 * Released under GNU GPL, read the file 'COPYING' for more information
13 */
15 #include <libnr/nr-compose-transform.h>
16 #include <2geom/transforms.h>
17 #include <libnr/nr-blit.h>
18 #include "../preferences.h"
19 #include "nr-arena-image.h"
20 #include "style.h"
21 #include "display/nr-arena.h"
22 #include "display/nr-filter.h"
23 #include "display/nr-filter-gaussian.h"
24 #include "sp-filter.h"
25 #include "sp-filter-reference.h"
26 #include "sp-gaussian-blur.h"
27 #include "filters/blend.h"
28 #include "display/nr-filter-blend.h"
30 int nr_arena_image_x_sample = 1;
31 int nr_arena_image_y_sample = 1;
33 /*
34 * NRArenaCanvasImage
35 *
36 */
38 static void nr_arena_image_class_init (NRArenaImageClass *klass);
39 static void nr_arena_image_init (NRArenaImage *image);
40 static void nr_arena_image_finalize (NRObject *object);
42 static unsigned int nr_arena_image_update (NRArenaItem *item, NRRectL *area, NRGC *gc, unsigned int state, unsigned int reset);
43 static unsigned int nr_arena_image_render (cairo_t *ct, NRArenaItem *item, NRRectL *area, NRPixBlock *pb, unsigned int flags);
44 static NRArenaItem *nr_arena_image_pick (NRArenaItem *item, Geom::Point p, double delta, unsigned int sticky);
46 static NRArenaItemClass *parent_class;
48 NRType
49 nr_arena_image_get_type (void)
50 {
51 static NRType type = 0;
52 if (!type) {
53 type = nr_object_register_type (NR_TYPE_ARENA_ITEM,
54 "NRArenaImage",
55 sizeof (NRArenaImageClass),
56 sizeof (NRArenaImage),
57 (void (*) (NRObjectClass *)) nr_arena_image_class_init,
58 (void (*) (NRObject *)) nr_arena_image_init);
59 }
60 return type;
61 }
63 static void
64 nr_arena_image_class_init (NRArenaImageClass *klass)
65 {
66 NRObjectClass *object_class;
67 NRArenaItemClass *item_class;
69 object_class = (NRObjectClass *) klass;
70 item_class = (NRArenaItemClass *) klass;
72 parent_class = (NRArenaItemClass *) ((NRObjectClass *) klass)->parent;
74 object_class->finalize = nr_arena_image_finalize;
75 object_class->cpp_ctor = NRObject::invoke_ctor<NRArenaImage>;
77 item_class->update = nr_arena_image_update;
78 item_class->render = nr_arena_image_render;
79 item_class->pick = nr_arena_image_pick;
80 }
82 static void
83 nr_arena_image_init (NRArenaImage *image)
84 {
85 image->px = NULL;
87 image->pxw = image->pxh = image->pxrs = 0;
88 image->x = image->y = 0.0;
89 image->width = 256.0;
90 image->height = 256.0;
92 image->grid2px.setIdentity();
94 image->style = 0;
95 }
97 static void
98 nr_arena_image_finalize (NRObject *object)
99 {
100 NRArenaImage *image = NR_ARENA_IMAGE (object);
102 image->px = NULL;
104 ((NRObjectClass *) parent_class)->finalize (object);
105 }
107 static unsigned int
108 nr_arena_image_update( NRArenaItem *item, NRRectL */*area*/, NRGC *gc, unsigned int /*state*/, unsigned int /*reset*/ )
109 {
110 Geom::Matrix grid2px;
112 // clear old bbox
113 nr_arena_item_request_render(item);
115 NRArenaImage *image = NR_ARENA_IMAGE (item);
117 /* Copy affine */
118 grid2px = gc->transform.inverse();
119 double hscale, vscale; // todo: replace with Geom::Scale
120 if (image->px) {
121 hscale = image->pxw / image->width;
122 vscale = image->pxh / image->height;
123 } else {
124 hscale = 1.0;
125 vscale = 1.0;
126 }
128 image->grid2px[0] = grid2px[0] * hscale;
129 image->grid2px[2] = grid2px[2] * hscale;
130 image->grid2px[4] = grid2px[4] * hscale;
131 image->grid2px[1] = grid2px[1] * vscale;
132 image->grid2px[3] = grid2px[3] * vscale;
133 image->grid2px[5] = grid2px[5] * vscale;
135 image->grid2px[4] -= image->x * hscale;
136 image->grid2px[5] -= image->y * vscale;
138 /* Calculate bbox */
139 if (image->px) {
140 NRRect bbox;
142 bbox.x0 = image->x;
143 bbox.y0 = image->y;
144 bbox.x1 = image->x + image->width;
145 bbox.y1 = image->y + image->height;
147 image->c00 = (Geom::Point(bbox.x0, bbox.y0) * gc->transform);
148 image->c01 = (Geom::Point(bbox.x0, bbox.y1) * gc->transform);
149 image->c10 = (Geom::Point(bbox.x1, bbox.y0) * gc->transform);
150 image->c11 = (Geom::Point(bbox.x1, bbox.y1) * gc->transform);
152 nr_rect_d_matrix_transform (&bbox, &bbox, gc->transform);
154 item->bbox.x0 = static_cast<NR::ICoord>(floor(bbox.x0)); // Floor gives the coordinate in which the point resides
155 item->bbox.y0 = static_cast<NR::ICoord>(floor(bbox.y0));
156 item->bbox.x1 = static_cast<NR::ICoord>(ceil (bbox.x1)); // Ceil gives the first coordinate beyond the point
157 item->bbox.y1 = static_cast<NR::ICoord>(ceil (bbox.y1));
158 } else {
159 item->bbox.x0 = (int) gc->transform[4];
160 item->bbox.y0 = (int) gc->transform[5];
161 item->bbox.x1 = item->bbox.x0 - 1;
162 item->bbox.y1 = item->bbox.y0 - 1;
163 }
165 return NR_ARENA_ITEM_STATE_ALL;
166 }
168 #define FBITS 12
169 #define b2i (image->grid2px)
171 static unsigned int
172 nr_arena_image_render( cairo_t *ct, NRArenaItem *item, NRRectL */*area*/, NRPixBlock *pb, unsigned int /*flags*/ )
173 {
174 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
175 nr_arena_image_x_sample = prefs->getInt("/options/bitmapoversample/value", 1);
176 nr_arena_image_y_sample = nr_arena_image_x_sample;
178 bool outline = (item->arena->rendermode == Inkscape::RENDERMODE_OUTLINE);
180 NRArenaImage *image = NR_ARENA_IMAGE (item);
182 Geom::Matrix d2s;
184 d2s[0] = b2i[0];
185 d2s[1] = b2i[1];
186 d2s[2] = b2i[2];
187 d2s[3] = b2i[3];
188 d2s[4] = b2i[0] * pb->area.x0 + b2i[2] * pb->area.y0 + b2i[4];
189 d2s[5] = b2i[1] * pb->area.x0 + b2i[3] * pb->area.y0 + b2i[5];
191 if (!outline) {
193 if (!image->px) return item->state;
195 guint32 Falpha = item->opacity;
196 if (Falpha < 1) return item->state;
198 unsigned char * dpx = NR_PIXBLOCK_PX (pb);
199 int const drs = pb->rs;
200 int const dw = pb->area.x1 - pb->area.x0;
201 int const dh = pb->area.y1 - pb->area.y0;
203 unsigned char * spx = image->px;
204 int const srs = image->pxrs;
205 int const sw = image->pxw;
206 int const sh = image->pxh;
208 if (pb->mode == NR_PIXBLOCK_MODE_R8G8B8) {
209 /* fixme: This is not implemented yet (Lauris) */
210 /* nr_R8G8B8_R8G8B8_R8G8B8A8_N_TRANSFORM (dpx, dw, dh, drs, spx, sw, sh, srs, d2s, Falpha, nr_arena_image_x_sample, nr_arena_image_y_sample); */
211 } else if (pb->mode == NR_PIXBLOCK_MODE_R8G8B8A8P) {
212 nr_R8G8B8A8_P_R8G8B8A8_P_R8G8B8A8_N_TRANSFORM (dpx, dw, dh, drs, spx, sw, sh, srs, d2s, Falpha, nr_arena_image_x_sample, nr_arena_image_y_sample);
213 } else if (pb->mode == NR_PIXBLOCK_MODE_R8G8B8A8N) {
214 nr_R8G8B8A8_N_R8G8B8A8_N_R8G8B8A8_N_TRANSFORM (dpx, dw, dh, drs, spx, sw, sh, srs, d2s, Falpha, nr_arena_image_x_sample, nr_arena_image_y_sample);
215 }
217 pb->empty = FALSE;
219 } else { // outline; draw a rect instead
221 if (!ct)
222 return item->state;
224 guint32 rgba = prefs->getInt("/options/wireframecolors/images", 0xff0000ff);
225 // FIXME: we use RGBA buffers but cairo writes BGRA (on i386), so we must cheat
226 // by setting color channels in the "wrong" order
227 cairo_set_source_rgba(ct, SP_RGBA32_B_F(rgba), SP_RGBA32_G_F(rgba), SP_RGBA32_R_F(rgba), SP_RGBA32_A_F(rgba));
229 cairo_set_line_width(ct, 0.5);
230 cairo_new_path(ct);
232 Geom::Point shift(pb->area.x0, pb->area.y0);
233 Geom::Point c00 = image->c00 - shift;
234 Geom::Point c01 = image->c01 - shift;
235 Geom::Point c11 = image->c11 - shift;
236 Geom::Point c10 = image->c10 - shift;
238 cairo_move_to (ct, c00[Geom::X], c00[Geom::Y]);
240 // the box
241 cairo_line_to (ct, c10[Geom::X], c10[Geom::Y]);
242 cairo_line_to (ct, c11[Geom::X], c11[Geom::Y]);
243 cairo_line_to (ct, c01[Geom::X], c01[Geom::Y]);
244 cairo_line_to (ct, c00[Geom::X], c00[Geom::Y]);
245 // the diagonals
246 cairo_line_to (ct, c11[Geom::X], c11[Geom::Y]);
247 cairo_move_to (ct, c10[Geom::X], c10[Geom::Y]);
248 cairo_line_to (ct, c01[Geom::X], c01[Geom::Y]);
250 cairo_stroke(ct);
252 pb->empty = FALSE;
253 }
255 return item->state;
256 }
258 /** Calculates the closest distance from p to the segment a1-a2*/
259 double
260 distance_to_segment (Geom::Point p, Geom::Point a1, Geom::Point a2)
261 {
262 // calculate sides of the triangle and their squares
263 double d1 = Geom::L2(p - a1);
264 double d1_2 = d1 * d1;
265 double d2 = Geom::L2(p - a2);
266 double d2_2 = d2 * d2;
267 double a = Geom::L2(a1 - a2);
268 double a_2 = a * a;
270 // if one of the angles at the base is > 90, return the corresponding side
271 if (d1_2 + a_2 <= d2_2) return d1;
272 if (d2_2 + a_2 <= d1_2) return d2;
274 // otherwise calculate the height to the base
275 double peri = (a + d1 + d2)/2;
276 return (2*sqrt(peri * (peri - a) * (peri - d1) * (peri - d2))/a);
277 }
279 static NRArenaItem *
280 nr_arena_image_pick( NRArenaItem *item, Geom::Point p, double delta, unsigned int /*sticky*/ )
281 {
282 NRArenaImage *image = NR_ARENA_IMAGE (item);
284 if (!image->px) return NULL;
286 bool outline = (item->arena->rendermode == Inkscape::RENDERMODE_OUTLINE);
288 if (outline) {
290 // frame
291 if (distance_to_segment (p, image->c00, image->c10) < delta) return item;
292 if (distance_to_segment (p, image->c10, image->c11) < delta) return item;
293 if (distance_to_segment (p, image->c11, image->c01) < delta) return item;
294 if (distance_to_segment (p, image->c01, image->c00) < delta) return item;
296 // diagonals
297 if (distance_to_segment (p, image->c00, image->c11) < delta) return item;
298 if (distance_to_segment (p, image->c10, image->c01) < delta) return item;
300 return NULL;
302 } else {
304 unsigned char *const pixels = image->px;
305 int const width = image->pxw;
306 int const height = image->pxh;
307 int const rowstride = image->pxrs;
308 Geom::Point tp = p * image->grid2px;
309 int const ix = (int)(tp[Geom::X]);
310 int const iy = (int)(tp[Geom::Y]);
312 if ((ix < 0) || (iy < 0) || (ix >= width) || (iy >= height))
313 return NULL;
315 unsigned char *pix_ptr = pixels + iy * rowstride + ix * 4;
316 // is the alpha not transparent?
317 return (pix_ptr[3] > 0) ? item : NULL;
318 }
319 }
321 /* Utility */
323 void
324 nr_arena_image_set_pixels (NRArenaImage *image, unsigned char const *px, unsigned int pxw, unsigned int pxh, unsigned int pxrs)
325 {
326 nr_return_if_fail (image != NULL);
327 nr_return_if_fail (NR_IS_ARENA_IMAGE (image));
329 image->px = (unsigned char *) px;
330 image->pxw = pxw;
331 image->pxh = pxh;
332 image->pxrs = pxrs;
334 nr_arena_item_request_update (NR_ARENA_ITEM (image), NR_ARENA_ITEM_STATE_ALL, FALSE);
335 }
337 void
338 nr_arena_image_set_geometry (NRArenaImage *image, double x, double y, double width, double height)
339 {
340 nr_return_if_fail (image != NULL);
341 nr_return_if_fail (NR_IS_ARENA_IMAGE (image));
343 image->x = x;
344 image->y = y;
345 image->width = width;
346 image->height = height;
348 nr_arena_item_request_update (NR_ARENA_ITEM (image), NR_ARENA_ITEM_STATE_ALL, FALSE);
349 }
351 void nr_arena_image_set_style (NRArenaImage *image, SPStyle *style)
352 {
353 g_return_if_fail(image != NULL);
354 g_return_if_fail(NR_IS_ARENA_IMAGE(image));
356 if (style) sp_style_ref(style);
357 if (image->style) sp_style_unref(image->style);
358 image->style = style;
360 //if image has a filter
361 if (style->filter.set && style->getFilter()) {
362 if (!image->filter) {
363 int primitives = sp_filter_primitive_count(SP_FILTER(style->getFilter()));
364 image->filter = new Inkscape::Filters::Filter(primitives);
365 }
366 sp_filter_build_renderer(SP_FILTER(style->getFilter()), image->filter);
367 } else {
368 //no filter set for this image
369 delete image->filter;
370 image->filter = NULL;
371 }
373 if (style && style->enable_background.set
374 && style->enable_background.value == SP_CSS_BACKGROUND_NEW) {
375 image->background_new = true;
376 }
378 nr_arena_item_request_update(image, NR_ARENA_ITEM_STATE_ALL, FALSE);
379 }
382 /*
383 Local Variables:
384 mode:c++
385 c-file-style:"stroustrup"
386 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
387 indent-tabs-mode:nil
388 fill-column:99
389 End:
390 */
391 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :