b05c92bc05d809a57bdbab6f424ff8650135b012
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 gchar c[64];
162 g_snprintf(c, 64, "%06x%02x", c32 >> 8,
163 pick == SP_DROPPER_PICK_ACTUAL? SP_COLOR_F_TO_U(dc->alpha) : 255);
165 Glib::ustring text;
166 text += c;
167 if (!text.empty())
168 {
169 Glib::RefPtr<Gtk::Clipboard> refClipboard =
170 Gtk::Clipboard::get();
171 refClipboard->set_text(text);
172 }
173 }
175 /**
176 * Makes a copy of the current desktop color to the clipboard.
177 */
178 void sp_dropper_c32_color_copy(guint32 c32)
179 {
180 int const pick = prefs_get_int_attribute("tools.dropper", "pick",
181 SP_DROPPER_PICK_VISIBLE);
183 gchar c[64];
184 g_snprintf(c, 64, "%06x%02x", c32 >> 8,
185 pick == SP_DROPPER_PICK_ACTUAL? SP_RGBA32_A_U(c32) : 255);
187 Glib::ustring text;
188 text += c;
189 if (!text.empty()) {
190 Glib::RefPtr<Gtk::Clipboard> refClipboard = Gtk::Clipboard::get();
191 refClipboard->set_text(text);
192 }
193 }
196 /**
197 * Makes a copy of the current color as a hex value. This should always compute
198 * the current color without alpha, but the on-screen representation.
199 */
200 void sp_dropper_c32_color_copy_hex(guint32 c32)
201 {
202 /*
203 int pick = prefs_get_int_attribute ("tools.dropper", "pick",
204 SP_DROPPER_PICK_VISIBLE);
206 if ( pick == SP_DROPPER_PICK_ACTUAL )
207 ; // process c32 so that it computes against page
208 // else just can cut off that last 2 hex digits....
210 */
212 gchar c[48];
213 g_snprintf(c, 48, "%06x", c32 >> 8);
215 Glib::ustring text;
216 text += c;
217 if (!text.empty()) {
218 Glib::RefPtr<Gtk::Clipboard> refClipboard = Gtk::Clipboard::get();
219 refClipboard->set_text(text);
220 }
221 }
224 static gint sp_dropper_context_root_handler(SPEventContext *ec, GdkEvent *event)
225 {
226 SPDropperContext *dc = (SPDropperContext *) ec;
227 int ret = FALSE;
229 int pick = prefs_get_int_attribute("tools.dropper", "pick", SP_DROPPER_PICK_VISIBLE);
231 switch (event->type) {
232 case GDK_BUTTON_PRESS:
233 if (event->button.button == 1) {
234 dc->centre = NR::Point(event->button.x, event->button.y);
235 dc->dragging = TRUE;
236 ret = TRUE;
237 }
238 break;
239 case GDK_MOTION_NOTIFY:
240 if (event->motion.state & GDK_BUTTON2_MASK) {
241 // pass on middle-drag
242 ret = FALSE;
243 break;
244 } else {
245 // otherwise, constantly calculate color no matter is any button pressed or not
247 double rw = 0.0;
248 double W(0), R(0), G(0), B(0), A(0);
250 if (dc->dragging) {
251 // calculate average
253 // radius
254 rw = std::min(NR::L2(NR::Point(event->button.x, event->button.y) - dc->centre), 400.0);
256 if (rw == 0) { // happens sometimes, little idea why...
257 break;
258 }
260 NR::Point const cd = ec->desktop->w2d(dc->centre);
261 NR::Matrix const w2dt = ec->desktop->w2d();
262 const double scale = rw * NR_MATRIX_DF_EXPANSION(&w2dt);
263 NR::Matrix const sm( NR::scale(scale, scale) * NR::translate(cd) );
264 sp_canvas_item_affine_absolute(dc->area, sm);
265 sp_canvas_item_show(dc->area);
267 /* Get buffer */
268 const int x0 = (int) floor(dc->centre[NR::X] - rw);
269 const int y0 = (int) floor(dc->centre[NR::Y] - rw);
270 const int x1 = (int) ceil(dc->centre[NR::X] + rw);
271 const int y1 = (int) ceil(dc->centre[NR::Y] + rw);
273 if ((x1 > x0) && (y1 > y0)) {
274 NRPixBlock pb;
275 nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x0, y0, x1, y1, TRUE);
276 /* fixme: (Lauris) */
277 sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(ec->desktop)), &pb);
278 for (int y = y0; y < y1; y++) {
279 const unsigned char *s = NR_PIXBLOCK_PX(&pb) + (y - y0) * pb.rs;
280 for (int x = x0; x < x1; x++) {
281 const double dx = x - dc->centre[NR::X];
282 const double dy = y - dc->centre[NR::Y];
283 const double w = exp(-((dx * dx) + (dy * dy)) / (rw * rw));
284 W += w;
285 R += w * s[0];
286 G += w * s[1];
287 B += w * s[2];
288 A += w * s[3];
289 s += 4;
290 }
291 }
292 nr_pixblock_release(&pb);
294 R = (R + 0.001) / (255.0 * W);
295 G = (G + 0.001) / (255.0 * W);
296 B = (B + 0.001) / (255.0 * W);
297 A = (A + 0.001) / (255.0 * W);
299 R = CLAMP(R, 0.0, 1.0);
300 G = CLAMP(G, 0.0, 1.0);
301 B = CLAMP(B, 0.0, 1.0);
302 A = CLAMP(A, 0.0, 1.0);
303 }
305 } else {
306 // pick single pixel
307 NRPixBlock pb;
308 int x = (int) floor(event->button.x);
309 int y = (int) floor(event->button.y);
310 nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x, y, x+1, y+1, TRUE);
311 sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(ec->desktop)), &pb);
312 const unsigned char *s = NR_PIXBLOCK_PX(&pb);
314 R = s[0] / 255.0;
315 G = s[1] / 255.0;
316 B = s[2] / 255.0;
317 A = s[3] / 255.0;
318 }
320 if (pick == SP_DROPPER_PICK_VISIBLE) {
321 // compose with page color
322 guint32 bg = sp_desktop_namedview(ec->desktop)->pagecolor;
323 R = R + (SP_RGBA32_R_F(bg)) * (1 - A);
324 G = G + (SP_RGBA32_G_F(bg)) * (1 - A);
325 B = B + (SP_RGBA32_B_F(bg)) * (1 - A);
326 A = 1.0;
327 } else {
328 // un-premultiply color channels
329 if (A > 0) {
330 R /= A;
331 G /= A;
332 B /= A;
333 }
334 }
336 if (fabs(A) < 1e-4) {
337 A = 0; // suppress exponentials, CSS does not allow that
338 }
340 // remember color
341 dc->R = R;
342 dc->G = G;
343 dc->B = B;
344 dc->alpha = A;
346 // status message
347 guint32 c32 = SP_RGBA32_F_COMPOSE(R, G, B, A);
349 gchar c[64];
350 sp_svg_write_color(c, 64, c32);
352 // alpha of color under cursor, to show in the statusbar
353 // locale-sensitive printf is OK, since this goes to the UI, not into SVG
354 gchar *alpha = g_strdup_printf(_(" alpha %.3g"), A);
355 // where the color is picked, to show in the statusbar
356 gchar *where = dc->dragging ? g_strdup_printf(_(", averaged with radius %d"), (int) rw) : g_strdup_printf(_(" under cursor"));
357 // message, to show in the statusbar
358 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");
359 ec->defaultMessageContext()->setF(
360 Inkscape::NORMAL_MESSAGE,
361 "<b>%s%s</b>%s. %s", c,
362 (pick == SP_DROPPER_PICK_VISIBLE)? "" : alpha,
363 where, message
364 );
366 g_free(where);
367 g_free(alpha);
369 ret = TRUE;
370 }
371 break;
372 case GDK_BUTTON_RELEASE:
373 if (event->button.button == 1)
374 {
375 sp_canvas_item_hide(dc->area);
376 dc->dragging = FALSE;
378 // do the actual color setting
379 sp_desktop_set_color(ec->desktop,
380 (event->button.state & GDK_MOD1_MASK)?
381 ColorRGBA(1 - dc->R, 1 - dc->G, 1 - dc->B, dc->alpha) : ColorRGBA(dc->R, dc->G, dc->B, dc->alpha),
382 false, !(event->button.state & GDK_SHIFT_MASK));
384 // REJON: set aux. toolbar input to hex color!
387 if (!(sp_desktop_selection(ec->desktop)->isEmpty())) {
388 sp_document_done(sp_desktop_document(ec->desktop));
389 }
391 ret = TRUE;
392 }
393 break;
394 case GDK_KEY_PRESS:
395 switch (get_group0_keyval(&event->key)) {
396 case GDK_Up:
397 case GDK_Down:
398 case GDK_KP_Up:
399 case GDK_KP_Down:
400 // prevent the zoom field from activation
401 if (!MOD__CTRL_ONLY) {
402 ret = TRUE;
403 }
404 break;
405 case GDK_Escape:
406 sp_desktop_selection(ec->desktop)->clear();
407 default:
408 break;
409 }
410 break;
411 default:
412 break;
413 }
415 if (!ret) {
416 if (((SPEventContextClass *) parent_class)->root_handler) {
417 ret = ((SPEventContextClass *) parent_class)->root_handler(ec, event);
418 }
419 }
421 return ret;
422 }
425 /*
426 Local Variables:
427 mode:c++
428 c-file-style:"stroustrup"
429 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
430 indent-tabs-mode:nil
431 fill-column:99
432 End:
433 */
434 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :