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     int setalpha = prefs_get_int_attribute("tools.dropper", "setalpha", 1);
 162
 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);
 166
 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 }
 176
 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);
 184
 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);
 188
 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 }
 196
 197
 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);
 207
 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....
 211
 212     */
 213
 214     gchar c[48];
 215     g_snprintf(c, 48, "%06x", c32 >> 8);
 216
 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 }
 224
 225
 226 static gint sp_dropper_context_root_handler(SPEventContext *ec, GdkEvent *event)
 227 {
 228     SPDropperContext *dc = (SPDropperContext *) ec;
 229     int ret = FALSE;
 230
 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);
 233
 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
 249
 250                 double rw = 0.0;
 251                 double W(0), R(0), G(0), B(0), A(0);
 252
 253                 if (dc->dragging) {
 254                     // calculate average
 255
 256                     // radius
 257                     rw = std::min(NR::L2(NR::Point(event->button.x, event->button.y) - dc->centre), 400.0);
 258
 259                     if (rw == 0) { // happens sometimes, little idea why...
 260                         break;
 261                     }
 262
 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);
 269
 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);
 275
 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);
 296
 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);
 301
 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                     }
 307
 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);
 316
 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                 }
 322
 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                 }
 338
 339                 if (fabs(A) < 1e-4) {
 340                     A = 0; // suppress exponentials, CSS does not allow that
 341                 }
 342
 343                 // remember color
 344                 dc->R = R;
 345                 dc->G = G;
 346                 dc->B = B;
 347                 dc->alpha = A;
 348
 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);
 352
 353                 gchar c[64];
 354                 sp_svg_write_color(c, 64, c32);
 355
 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                     );
 369
 370                 g_free(where);
 371                 g_free(alpha);
 372
 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;
 381
 382                 double alpha_to_set = setalpha? dc->alpha : 1.0;
 383
 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));
 389
 390                 // REJON: set aux. toolbar input to hex color!
 391
 392
 393                 if (!(sp_desktop_selection(ec->desktop)->isEmpty())) {
 394                     sp_document_done(sp_desktop_document(ec->desktop), SP_VERB_CONTEXT_DROPPER,
 395                                      _("Set picked color"));
 396                 }
 397
 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     }
 421
 422     if (!ret) {
 423         if (((SPEventContextClass *) parent_class)->root_handler) {
 424             ret = ((SPEventContextClass *) parent_class)->root_handler(ec, event);
 425         }
 426     }
 427
 428     return ret;
 429 }
 430
 431
 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 :