src/dropper-context.cpp

   1 #define __SP_DROPPER_CONTEXT_C__
   2
   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  */
  14
  15 #ifdef HAVE_CONFIG_H
  16 # include <config.h>
  17 #endif
  18
  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>
  24
  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"
  40
  41 #include "pixmaps/cursor-dropper.xpm"
  42 #include "pixmaps/cursor-dropper.pixbuf"
  43
  44 #include "dropper-context.h"
  45 #include "message-context.h"
  46 #include "libnr/nr-scale-translate-ops.h"
  47
  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
  58
  59 static void sp_dropper_context_class_init(SPDropperContextClass *klass);
  60 static void sp_dropper_context_init(SPDropperContext *dc);
  61
  62 static void sp_dropper_context_setup(SPEventContext *ec);
  63 static void sp_dropper_context_finish(SPEventContext *ec);
  64
  65 static gint sp_dropper_context_root_handler(SPEventContext *ec, GdkEvent * event);
  66
  67 static SPEventContextClass *parent_class;
  68
  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 }
  87
  88 static void sp_dropper_context_class_init(SPDropperContextClass *klass)
  89 {
  90     SPEventContextClass *ec_class = (SPEventContextClass *) klass;
  91
  92     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
  93
  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 }
  98
  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 }
 111
 112 static void sp_dropper_context_setup(SPEventContext *ec)
 113 {
 114     SPDropperContext *dc = SP_DROPPER_CONTEXT(ec);
 115
 116     if (((SPEventContextClass *) parent_class)->setup) {
 117         ((SPEventContextClass *) parent_class)->setup(ec);
 118     }
 119
 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);
 126
 127     if (prefs_get_int_attribute("tools.dropper", "selcue", 0) != 0) {
 128         ec->enableSelectionCue();
 129     }
 130
 131     if (prefs_get_int_attribute("tools.dropper", "gradientdrag", 0) != 0) {
 132         ec->enableGrDrag();
 133     }
 134 }
 135
 136 static void sp_dropper_context_finish(SPEventContext *ec)
 137 {
 138     SPDropperContext *dc = SP_DROPPER_CONTEXT(ec);
 139
 140     ec->enableGrDrag(false);
 141
 142     if (dc->area) {
 143         gtk_object_destroy(GTK_OBJECT(dc->area));
 144         dc->area = NULL;
 145     }
 146 }
 147
 148
 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);
 155
 156     guint32 const c32 = SP_RGBA32_F_COMPOSE(dc->R, dc->G, dc->B, dc->alpha);
 157
 158     int pick = prefs_get_int_attribute("tools.dropper", "pick",
 159                                        SP_DROPPER_PICK_VISIBLE);
 160
 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);
 164
 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 }
 174
 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);
 182
 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);
 186
 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 }
 194
 195
 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);
 205
 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....
 209
 210     */
 211
 212     gchar c[48];
 213     g_snprintf(c, 48, "%06x", c32 >> 8);
 214
 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 }
 222
 223
 224 static gint sp_dropper_context_root_handler(SPEventContext *ec, GdkEvent *event)
 225 {
 226     SPDropperContext *dc = (SPDropperContext *) ec;
 227     int ret = FALSE;
 228
 229     int pick = prefs_get_int_attribute("tools.dropper", "pick", SP_DROPPER_PICK_VISIBLE);
 230
 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
 246
 247                 double rw = 0.0;
 248                 double W(0), R(0), G(0), B(0), A(0);
 249
 250                 if (dc->dragging) {
 251                     // calculate average
 252
 253                     // radius
 254                     rw = std::min(NR::L2(NR::Point(event->button.x, event->button.y) - dc->centre), 400.0);
 255
 256                     if (rw == 0) { // happens sometimes, little idea why...
 257                         break;
 258                     }
 259
 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);
 266
 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);
 272
 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);
 293
 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);
 298
 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                     }
 304
 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);
 313
 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                 }
 319
 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                 }
 335
 336                 if (fabs(A) < 1e-4) {
 337                     A = 0; // suppress exponentials, CSS does not allow that
 338                 }
 339
 340                 // remember color
 341                 dc->R = R;
 342                 dc->G = G;
 343                 dc->B = B;
 344                 dc->alpha = A;
 345
 346                 // status message
 347                 guint32 c32 = SP_RGBA32_F_COMPOSE(R, G, B, A);
 348
 349                 gchar c[64];
 350                 sp_svg_write_color(c, 64, c32);
 351
 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                     );
 365
 366                 g_free(where);
 367                 g_free(alpha);
 368
 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;
 377
 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));
 383
 384                 // REJON: set aux. toolbar input to hex color!
 385
 386
 387                 if (!(sp_desktop_selection(ec->desktop)->isEmpty())) {
 388                     sp_document_done(sp_desktop_document(ec->desktop));
 389                 }
 390
 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     }
 414
 415     if (!ret) {
 416         if (((SPEventContextClass *) parent_class)->root_handler) {
 417             ret = ((SPEventContextClass *) parent_class)->root_handler(ec, event);
 418         }
 419     }
 420
 421     return ret;
 422 }
 423
 424
 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 :