1 #define __SP_DROPPER_CONTEXT_C__
3 /*
4 * Tool for picking colors from drawing
5 *
6 * Authors:
7 * Lauris Kaplinski <lauris@kaplinski.com>
8 * bulia byak <buliabyak@users.sf.net>
9 *
10 * Copyright (C) 1999-2005 Authors
11 *
12 * Released under GNU GPL, read the file 'COPYING' for more information
13 */
15 #ifdef HAVE_CONFIG_H
16 # include <config.h>
17 #endif
19 #include <glibmm/i18n.h>
20 #include <glibmm/ustring.h>
21 #include <glibmm/refptr.h>
22 #include <gtkmm/clipboard.h>
23 #include <gdk/gdkkeysyms.h>
25 #include "libnr/n-art-bpath.h"
26 #include "macros.h"
27 #include "display/canvas-bpath.h"
28 #include "display/canvas-arena.h"
29 #include "display/curve.h"
30 #include "svg/svg-color.h"
31 #include "color.h"
32 #include "color-rgba.h"
33 #include "desktop-style.h"
34 #include "prefs-utils.h"
35 #include "sp-namedview.h"
36 #include "desktop.h"
37 #include "desktop-handles.h"
38 #include "selection.h"
39 #include "document.h"
41 #include "pixmaps/cursor-dropper.xpm"
42 #include "pixmaps/cursor-dropper.pixbuf"
44 #include "dropper-context.h"
45 #include "message-context.h"
46 #include "libnr/nr-scale-translate-ops.h"
48 #define C1 0.552
49 static NArtBpath const spdc_circle[] = {
50 { NR_MOVETO, 0, 0, 0, 0, -1, 0 },
51 { NR_CURVETO, -1, C1, -C1, 1, 0, 1 },
52 { NR_CURVETO, C1, 1, 1, C1, 1, 0 },
53 { NR_CURVETO, 1, -C1, C1, -1, 0, -1 },
54 { NR_CURVETO, -C1, -1, -1, -C1, -1, 0 },
55 { NR_END, 0, 0, 0, 0, 0, 0 }
56 };
57 #undef C1
59 static void sp_dropper_context_class_init(SPDropperContextClass *klass);
60 static void sp_dropper_context_init(SPDropperContext *dc);
62 static void sp_dropper_context_setup(SPEventContext *ec);
63 static void sp_dropper_context_finish(SPEventContext *ec);
65 static gint sp_dropper_context_root_handler(SPEventContext *ec, GdkEvent * event);
67 static SPEventContextClass *parent_class;
69 GType sp_dropper_context_get_type()
70 {
71 static GType type = 0;
72 if (!type) {
73 GTypeInfo info = {
74 sizeof(SPDropperContextClass),
75 NULL, NULL,
76 (GClassInitFunc) sp_dropper_context_class_init,
77 NULL, NULL,
78 sizeof(SPDropperContext),
79 4,
80 (GInstanceInitFunc) sp_dropper_context_init,
81 NULL, /* value_table */
82 };
83 type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDropperContext", &info, (GTypeFlags) 0);
84 }
85 return type;
86 }
88 static void sp_dropper_context_class_init(SPDropperContextClass *klass)
89 {
90 SPEventContextClass *ec_class = (SPEventContextClass *) klass;
92 parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
94 ec_class->setup = sp_dropper_context_setup;
95 ec_class->finish = sp_dropper_context_finish;
96 ec_class->root_handler = sp_dropper_context_root_handler;
97 }
99 static void sp_dropper_context_init(SPDropperContext *dc)
100 {
101 SPEventContext *event_context = SP_EVENT_CONTEXT(dc);
102 event_context->cursor_shape = cursor_dropper_xpm;
103 event_context->cursor_pixbuf = gdk_pixbuf_new_from_inline(
104 -1,
105 cursor_dropper_pixbuf,
106 FALSE,
107 NULL);
108 event_context->hot_x = 7;
109 event_context->hot_y = 7;
110 }
112 static void sp_dropper_context_setup(SPEventContext *ec)
113 {
114 SPDropperContext *dc = SP_DROPPER_CONTEXT(ec);
116 if (((SPEventContextClass *) parent_class)->setup) {
117 ((SPEventContextClass *) parent_class)->setup(ec);
118 }
120 SPCurve *c = sp_curve_new_from_foreign_bpath(spdc_circle);
121 dc->area = sp_canvas_bpath_new(sp_desktop_controls(ec->desktop), c);
122 sp_curve_unref(c);
123 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(dc->area), 0x00000000,(SPWindRule)0);
124 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->area), 0x0000007f, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
125 sp_canvas_item_hide(dc->area);
127 if (prefs_get_int_attribute("tools.dropper", "selcue", 0) != 0) {
128 ec->enableSelectionCue();
129 }
131 if (prefs_get_int_attribute("tools.dropper", "gradientdrag", 0) != 0) {
132 ec->enableGrDrag();
133 }
134 }
136 static void sp_dropper_context_finish(SPEventContext *ec)
137 {
138 SPDropperContext *dc = SP_DROPPER_CONTEXT(ec);
140 ec->enableGrDrag(false);
142 if (dc->area) {
143 gtk_object_destroy(GTK_OBJECT(dc->area));
144 dc->area = NULL;
145 }
146 }
149 /**
150 * Copies the current context color to the clipboard.
151 */
152 void sp_dropper_context_copy(SPEventContext *ec)
153 {
154 SPDropperContext *dc = SP_DROPPER_CONTEXT(ec);
156 guint32 const c32 = SP_RGBA32_F_COMPOSE(dc->R, dc->G, dc->B, dc->alpha);
158 int pick = prefs_get_int_attribute("tools.dropper", "pick",
159 SP_DROPPER_PICK_VISIBLE);
161 int setalpha = prefs_get_int_attribute("tools.dropper", "setalpha", 1);
163 gchar c[64];
164 g_snprintf(c, 64, "%06x%02x", c32 >> 8,
165 (pick == SP_DROPPER_PICK_ACTUAL && setalpha)? SP_COLOR_F_TO_U(dc->alpha) : 255);
167 Glib::ustring text;
168 text += c;
169 if (!text.empty())
170 {
171 Glib::RefPtr<Gtk::Clipboard> refClipboard =
172 Gtk::Clipboard::get();
173 refClipboard->set_text(text);
174 }
175 }
177 /**
178 * Makes a copy of the current desktop color to the clipboard.
179 */
180 void sp_dropper_c32_color_copy(guint32 c32)
181 {
182 int const pick = prefs_get_int_attribute("tools.dropper", "pick",
183 SP_DROPPER_PICK_VISIBLE);
185 gchar c[64];
186 g_snprintf(c, 64, "%06x%02x", c32 >> 8,
187 pick == SP_DROPPER_PICK_ACTUAL? SP_RGBA32_A_U(c32) : 255);
189 Glib::ustring text;
190 text += c;
191 if (!text.empty()) {
192 Glib::RefPtr<Gtk::Clipboard> refClipboard = Gtk::Clipboard::get();
193 refClipboard->set_text(text);
194 }
195 }
198 /**
199 * Makes a copy of the current color as a hex value. This should always compute
200 * the current color without alpha, but the on-screen representation.
201 */
202 void sp_dropper_c32_color_copy_hex(guint32 c32)
203 {
204 /*
205 int pick = prefs_get_int_attribute ("tools.dropper", "pick",
206 SP_DROPPER_PICK_VISIBLE);
208 if ( pick == SP_DROPPER_PICK_ACTUAL )
209 ; // process c32 so that it computes against page
210 // else just can cut off that last 2 hex digits....
212 */
214 gchar c[48];
215 g_snprintf(c, 48, "%06x", c32 >> 8);
217 Glib::ustring text;
218 text += c;
219 if (!text.empty()) {
220 Glib::RefPtr<Gtk::Clipboard> refClipboard = Gtk::Clipboard::get();
221 refClipboard->set_text(text);
222 }
223 }
226 static gint sp_dropper_context_root_handler(SPEventContext *ec, GdkEvent *event)
227 {
228 SPDropperContext *dc = (SPDropperContext *) ec;
229 int ret = FALSE;
231 int pick = prefs_get_int_attribute("tools.dropper", "pick", SP_DROPPER_PICK_VISIBLE);
232 int setalpha = prefs_get_int_attribute("tools.dropper", "setalpha", 1);
234 switch (event->type) {
235 case GDK_BUTTON_PRESS:
236 if (event->button.button == 1) {
237 dc->centre = NR::Point(event->button.x, event->button.y);
238 dc->dragging = TRUE;
239 ret = TRUE;
240 }
241 break;
242 case GDK_MOTION_NOTIFY:
243 if (event->motion.state & GDK_BUTTON2_MASK) {
244 // pass on middle-drag
245 ret = FALSE;
246 break;
247 } else {
248 // otherwise, constantly calculate color no matter is any button pressed or not
250 double rw = 0.0;
251 double W(0), R(0), G(0), B(0), A(0);
253 if (dc->dragging) {
254 // calculate average
256 // radius
257 rw = std::min(NR::L2(NR::Point(event->button.x, event->button.y) - dc->centre), 400.0);
259 if (rw == 0) { // happens sometimes, little idea why...
260 break;
261 }
263 NR::Point const cd = ec->desktop->w2d(dc->centre);
264 NR::Matrix const w2dt = ec->desktop->w2d();
265 const double scale = rw * NR_MATRIX_DF_EXPANSION(&w2dt);
266 NR::Matrix const sm( NR::scale(scale, scale) * NR::translate(cd) );
267 sp_canvas_item_affine_absolute(dc->area, sm);
268 sp_canvas_item_show(dc->area);
270 /* Get buffer */
271 const int x0 = (int) floor(dc->centre[NR::X] - rw);
272 const int y0 = (int) floor(dc->centre[NR::Y] - rw);
273 const int x1 = (int) ceil(dc->centre[NR::X] + rw);
274 const int y1 = (int) ceil(dc->centre[NR::Y] + rw);
276 if ((x1 > x0) && (y1 > y0)) {
277 NRPixBlock pb;
278 nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x0, y0, x1, y1, TRUE);
279 /* fixme: (Lauris) */
280 sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(ec->desktop)), &pb);
281 for (int y = y0; y < y1; y++) {
282 const unsigned char *s = NR_PIXBLOCK_PX(&pb) + (y - y0) * pb.rs;
283 for (int x = x0; x < x1; x++) {
284 const double dx = x - dc->centre[NR::X];
285 const double dy = y - dc->centre[NR::Y];
286 const double w = exp(-((dx * dx) + (dy * dy)) / (rw * rw));
287 W += w;
288 R += w * s[0];
289 G += w * s[1];
290 B += w * s[2];
291 A += w * s[3];
292 s += 4;
293 }
294 }
295 nr_pixblock_release(&pb);
297 R = (R + 0.001) / (255.0 * W);
298 G = (G + 0.001) / (255.0 * W);
299 B = (B + 0.001) / (255.0 * W);
300 A = (A + 0.001) / (255.0 * W);
302 R = CLAMP(R, 0.0, 1.0);
303 G = CLAMP(G, 0.0, 1.0);
304 B = CLAMP(B, 0.0, 1.0);
305 A = CLAMP(A, 0.0, 1.0);
306 }
308 } else {
309 // pick single pixel
310 NRPixBlock pb;
311 int x = (int) floor(event->button.x);
312 int y = (int) floor(event->button.y);
313 nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x, y, x+1, y+1, TRUE);
314 sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(ec->desktop)), &pb);
315 const unsigned char *s = NR_PIXBLOCK_PX(&pb);
317 R = s[0] / 255.0;
318 G = s[1] / 255.0;
319 B = s[2] / 255.0;
320 A = s[3] / 255.0;
321 }
323 if (pick == SP_DROPPER_PICK_VISIBLE) {
324 // compose with page color
325 guint32 bg = sp_desktop_namedview(ec->desktop)->pagecolor;
326 R = R + (SP_RGBA32_R_F(bg)) * (1 - A);
327 G = G + (SP_RGBA32_G_F(bg)) * (1 - A);
328 B = B + (SP_RGBA32_B_F(bg)) * (1 - A);
329 A = 1.0;
330 } else {
331 // un-premultiply color channels
332 if (A > 0) {
333 R /= A;
334 G /= A;
335 B /= A;
336 }
337 }
339 if (fabs(A) < 1e-4) {
340 A = 0; // suppress exponentials, CSS does not allow that
341 }
343 // remember color
344 dc->R = R;
345 dc->G = G;
346 dc->B = B;
347 dc->alpha = A;
349 // status message
350 double alpha_to_set = setalpha? dc->alpha : 1.0;
351 guint32 c32 = SP_RGBA32_F_COMPOSE(R, G, B, alpha_to_set);
353 gchar c[64];
354 sp_svg_write_color(c, 64, c32);
356 // alpha of color under cursor, to show in the statusbar
357 // locale-sensitive printf is OK, since this goes to the UI, not into SVG
358 gchar *alpha = g_strdup_printf(_(" alpha %.3g"), alpha_to_set);
359 // where the color is picked, to show in the statusbar
360 gchar *where = dc->dragging ? g_strdup_printf(_(", averaged with radius %d"), (int) rw) : g_strdup_printf(_(" under cursor"));
361 // message, to show in the statusbar
362 const gchar *message = dc->dragging ? _("<b>Release mouse</b> to set color.") : _("<b>Click</b> to set fill, <b>Shift+click</b> to set stroke; <b>drag</b> to average color in area; with <b>Alt</b> to pick inverse color; <b>Ctrl+C</b> to copy the color under mouse to clipboard");
363 ec->defaultMessageContext()->setF(
364 Inkscape::NORMAL_MESSAGE,
365 "<b>%s%s</b>%s. %s", c,
366 (pick == SP_DROPPER_PICK_VISIBLE)? "" : alpha,
367 where, message
368 );
370 g_free(where);
371 g_free(alpha);
373 ret = TRUE;
374 }
375 break;
376 case GDK_BUTTON_RELEASE:
377 if (event->button.button == 1)
378 {
379 sp_canvas_item_hide(dc->area);
380 dc->dragging = FALSE;
382 double alpha_to_set = setalpha? dc->alpha : 1.0;
384 // do the actual color setting
385 sp_desktop_set_color(ec->desktop,
386 (event->button.state & GDK_MOD1_MASK)?
387 ColorRGBA(1 - dc->R, 1 - dc->G, 1 - dc->B, alpha_to_set) : ColorRGBA(dc->R, dc->G, dc->B, alpha_to_set),
388 false, !(event->button.state & GDK_SHIFT_MASK));
390 // REJON: set aux. toolbar input to hex color!
393 if (!(sp_desktop_selection(ec->desktop)->isEmpty())) {
394 sp_document_done(sp_desktop_document(ec->desktop), SP_VERB_CONTEXT_DROPPER,
395 /* TODO: annotate */ "dropper-context.cpp:389");
396 }
398 ret = TRUE;
399 }
400 break;
401 case GDK_KEY_PRESS:
402 switch (get_group0_keyval(&event->key)) {
403 case GDK_Up:
404 case GDK_Down:
405 case GDK_KP_Up:
406 case GDK_KP_Down:
407 // prevent the zoom field from activation
408 if (!MOD__CTRL_ONLY) {
409 ret = TRUE;
410 }
411 break;
412 case GDK_Escape:
413 sp_desktop_selection(ec->desktop)->clear();
414 default:
415 break;
416 }
417 break;
418 default:
419 break;
420 }
422 if (!ret) {
423 if (((SPEventContextClass *) parent_class)->root_handler) {
424 ret = ((SPEventContextClass *) parent_class)->root_handler(ec, event);
425 }
426 }
428 return ret;
429 }
432 /*
433 Local Variables:
434 mode:c++
435 c-file-style:"stroustrup"
436 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
437 indent-tabs-mode:nil
438 fill-column:99
439 End:
440 */
441 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :