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 "macros.h"
  26 #include "display/canvas-bpath.h"
  27 #include "display/canvas-arena.h"
  28 #include "display/curve.h"
  29 #include "svg/svg-color.h"
  30 #include "color.h"
  31 #include "color-rgba.h"
  32 #include "desktop-style.h"
  33 #include "preferences.h"
  34 #include "sp-namedview.h"
  35 #include "desktop.h"
  36 #include "desktop-handles.h"
  37 #include "selection.h"
  38 #include "document.h"
  39
  40 #include "pixmaps/cursor-dropper.xpm"
  41
  42 #include "dropper-context.h"
  43 #include "message-context.h"
  44 //#include "libnr/nr-scale-translate-ops.h"
  45
  46 static void sp_dropper_context_class_init(SPDropperContextClass *klass);
  47 static void sp_dropper_context_init(SPDropperContext *dc);
  48
  49 static void sp_dropper_context_setup(SPEventContext *ec);
  50 static void sp_dropper_context_finish(SPEventContext *ec);
  51
  52 static gint sp_dropper_context_root_handler(SPEventContext *ec, GdkEvent * event);
  53
  54 static SPEventContextClass *parent_class;
  55
  56 GType sp_dropper_context_get_type()
  57 {
  58     static GType type = 0;
  59     if (!type) {
  60         GTypeInfo info = {
  61             sizeof(SPDropperContextClass),
  62             NULL, NULL,
  63             (GClassInitFunc) sp_dropper_context_class_init,
  64             NULL, NULL,
  65             sizeof(SPDropperContext),
  66             4,
  67             (GInstanceInitFunc) sp_dropper_context_init,
  68             NULL,       /* value_table */
  69         };
  70         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDropperContext", &info, (GTypeFlags) 0);
  71     }
  72     return type;
  73 }
  74
  75 static void sp_dropper_context_class_init(SPDropperContextClass *klass)
  76 {
  77     SPEventContextClass *ec_class = (SPEventContextClass *) klass;
  78
  79     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
  80
  81     ec_class->setup = sp_dropper_context_setup;
  82     ec_class->finish = sp_dropper_context_finish;
  83     ec_class->root_handler = sp_dropper_context_root_handler;
  84 }
  85
  86 static void sp_dropper_context_init(SPDropperContext *dc)
  87 {
  88     SPEventContext *event_context = SP_EVENT_CONTEXT(dc);
  89     event_context->cursor_shape = cursor_dropper_xpm;
  90     event_context->hot_x = 7;
  91     event_context->hot_y = 7;
  92 }
  93
  94 static void sp_dropper_context_setup(SPEventContext *ec)
  95 {
  96     SPDropperContext *dc = SP_DROPPER_CONTEXT(ec);
  97
  98     if (((SPEventContextClass *) parent_class)->setup) {
  99         ((SPEventContextClass *) parent_class)->setup(ec);
 100     }
 101
 102     /* TODO: have a look at sp_dyna_draw_context_setup where the same is done.. generalize? at least make it an arcto! */
 103     SPCurve *c = new SPCurve();
 104     const double C1 = 0.552;
 105     c->moveto(-1,0);
 106     c->curveto(-1, C1, -C1, 1, 0, 1 );
 107     c->curveto(C1, 1, 1, C1, 1, 0 );
 108     c->curveto(1, -C1, C1, -1, 0, -1 );
 109     c->curveto(-C1, -1, -1, -C1, -1, 0 );
 110     c->closepath();
 111     dc->area = sp_canvas_bpath_new(sp_desktop_controls(ec->desktop), c);
 112     c->unref();
 113     sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(dc->area), 0x00000000,(SPWindRule)0);
 114     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->area), 0x0000007f, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 115     sp_canvas_item_hide(dc->area);
 116
 117     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 118     if (prefs->getBool("/tools/dropper/selcue")) {
 119         ec->enableSelectionCue();
 120     }
 121
 122     if (prefs->getBool("/tools/dropper/gradientdrag")) {
 123         ec->enableGrDrag();
 124     }
 125 }
 126
 127 static void sp_dropper_context_finish(SPEventContext *ec)
 128 {
 129     SPDropperContext *dc = SP_DROPPER_CONTEXT(ec);
 130
 131     ec->enableGrDrag(false);
 132
 133     if (dc->grabbed) {
 134         sp_canvas_item_ungrab(dc->grabbed, GDK_CURRENT_TIME);
 135         dc->grabbed = NULL;
 136     }
 137
 138     if (dc->area) {
 139         gtk_object_destroy(GTK_OBJECT(dc->area));
 140         dc->area = NULL;
 141     }
 142 }
 143
 144
 145 /**
 146  * Returns the current dropper context icc-color.
 147  */
 148 SPColor* sp_dropper_context_get_icc_color(SPEventContext */*ec*/)
 149 {
 150     //TODO: implement-me!
 151
 152     return 0; // At least we will cause a clean crash, instead of random corruption.
 153 }
 154
 155 /**
 156  * Returns the current dropper context color.
 157  */
 158 guint32 sp_dropper_context_get_color(SPEventContext *ec)
 159 {
 160     SPDropperContext *dc = SP_DROPPER_CONTEXT(ec);
 161     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 162
 163     int pick = prefs->getInt("/tools/dropper/pick",
 164                                        SP_DROPPER_PICK_VISIBLE);
 165     bool setalpha = prefs->getBool("/tools/dropper/setalpha", true);
 166
 167     return SP_RGBA32_F_COMPOSE(dc->R, dc->G, dc->B,
 168         (pick == SP_DROPPER_PICK_ACTUAL && setalpha) ? dc->alpha : 1.0);
 169 }
 170
 171
 172 static gint sp_dropper_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 173 {
 174     SPDropperContext *dc = (SPDropperContext *) event_context;
 175     int ret = FALSE;
 176     SPDesktop *desktop = event_context->desktop;
 177     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 178
 179     int pick = prefs->getInt("/tools/dropper/pick", SP_DROPPER_PICK_VISIBLE);
 180     bool setalpha = prefs->getBool("/tools/dropper/setalpha", true);
 181
 182     switch (event->type) {
 183         case GDK_BUTTON_PRESS:
 184             if (event->button.button == 1 && !event_context->space_panning) {
 185                 dc->centre = Geom::Point(event->button.x, event->button.y);
 186                 dc->dragging = TRUE;
 187                 ret = TRUE;
 188             }
 189
 190                         sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 191                                                                 GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK,
 192                                                                 NULL, event->button.time);
 193                         dc->grabbed = SP_CANVAS_ITEM(desktop->acetate);
 194
 195             break;
 196         case GDK_MOTION_NOTIFY:
 197             if (event->motion.state & GDK_BUTTON2_MASK) {
 198                 // pass on middle-drag
 199                 ret = FALSE;
 200                 break;
 201             } else if (!event_context->space_panning) {
 202                 // otherwise, constantly calculate color no matter is any button pressed or not
 203
 204                 double rw = 0.0;
 205                 double W(0), R(0), G(0), B(0), A(0);
 206
 207                 if (dc->dragging) {
 208                     // calculate average
 209
 210                     // radius
 211                     rw = std::min(Geom::L2(Geom::Point(event->button.x, event->button.y) - dc->centre), 400.0);
 212
 213                     if (rw == 0) { // happens sometimes, little idea why...
 214                         break;
 215                     }
 216
 217                     Geom::Point const cd = desktop->w2d(dc->centre);
 218                     Geom::Matrix const w2dt = desktop->w2d();
 219                     const double scale = rw * w2dt.descrim();
 220                     Geom::Matrix const sm( Geom::Scale(scale, scale) * Geom::Translate(cd) );
 221                     sp_canvas_item_affine_absolute(dc->area, sm);
 222                     sp_canvas_item_show(dc->area);
 223
 224                     /* Get buffer */
 225                     const int x0 = (int) floor(dc->centre[Geom::X] - rw);
 226                     const int y0 = (int) floor(dc->centre[Geom::Y] - rw);
 227                     const int x1 = (int) ceil(dc->centre[Geom::X] + rw);
 228                     const int y1 = (int) ceil(dc->centre[Geom::Y] + rw);
 229
 230                     if ((x1 > x0) && (y1 > y0)) {
 231                         NRPixBlock pb;
 232                         nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x0, y0, x1, y1, TRUE);
 233                         /* fixme: (Lauris) */
 234                         sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(desktop)), &pb);
 235                         for (int y = y0; y < y1; y++) {
 236                             const unsigned char *s = NR_PIXBLOCK_PX(&pb) + (y - y0) * pb.rs;
 237                             for (int x = x0; x < x1; x++) {
 238                                 const double dx = x - dc->centre[Geom::X];
 239                                 const double dy = y - dc->centre[Geom::Y];
 240                                 const double w = exp(-((dx * dx) + (dy * dy)) / (rw * rw));
 241                                 W += w;
 242                                 R += w * s[0];
 243                                 G += w * s[1];
 244                                 B += w * s[2];
 245                                 A += w * s[3];
 246                                 s += 4;
 247                             }
 248                         }
 249                         nr_pixblock_release(&pb);
 250
 251                         R = (R + 0.001) / (255.0 * W);
 252                         G = (G + 0.001) / (255.0 * W);
 253                         B = (B + 0.001) / (255.0 * W);
 254                         A = (A + 0.001) / (255.0 * W);
 255
 256                         R = CLAMP(R, 0.0, 1.0);
 257                         G = CLAMP(G, 0.0, 1.0);
 258                         B = CLAMP(B, 0.0, 1.0);
 259                         A = CLAMP(A, 0.0, 1.0);
 260                     }
 261
 262                 } else {
 263                     // pick single pixel
 264                     NRPixBlock pb;
 265                     int x = (int) floor(event->button.x);
 266                     int y = (int) floor(event->button.y);
 267                     nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x, y, x+1, y+1, TRUE);
 268                     sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(desktop)), &pb);
 269                     const unsigned char *s = NR_PIXBLOCK_PX(&pb);
 270
 271                     R = s[0] / 255.0;
 272                     G = s[1] / 255.0;
 273                     B = s[2] / 255.0;
 274                     A = s[3] / 255.0;
 275                 }
 276
 277                 if (pick == SP_DROPPER_PICK_VISIBLE) {
 278                     // compose with page color
 279                     guint32 bg = sp_desktop_namedview(desktop)->pagecolor;
 280                     R = R + (SP_RGBA32_R_F(bg)) * (1 - A);
 281                     G = G + (SP_RGBA32_G_F(bg)) * (1 - A);
 282                     B = B + (SP_RGBA32_B_F(bg)) * (1 - A);
 283                     A = 1.0;
 284                 } else {
 285                     // un-premultiply color channels
 286                     if (A > 0) {
 287                         R /= A;
 288                         G /= A;
 289                         B /= A;
 290                     }
 291                 }
 292
 293                 if (fabs(A) < 1e-4) {
 294                     A = 0; // suppress exponentials, CSS does not allow that
 295                 }
 296
 297                 // remember color
 298                 dc->R = R;
 299                 dc->G = G;
 300                 dc->B = B;
 301                 dc->alpha = A;
 302
 303                 // status message
 304                 double alpha_to_set = setalpha? dc->alpha : 1.0;
 305                 guint32 c32 = SP_RGBA32_F_COMPOSE(R, G, B, alpha_to_set);
 306
 307                 gchar c[64];
 308                 sp_svg_write_color(c, sizeof(c), c32);
 309
 310                 // alpha of color under cursor, to show in the statusbar
 311                 // locale-sensitive printf is OK, since this goes to the UI, not into SVG
 312                 gchar *alpha = g_strdup_printf(_(" alpha %.3g"), alpha_to_set);
 313                 // where the color is picked, to show in the statusbar
 314                 gchar *where = dc->dragging ? g_strdup_printf(_(", averaged with radius %d"), (int) rw) : g_strdup_printf(_(" under cursor"));
 315                 // message, to show in the statusbar
 316                 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");
 317                 event_context->defaultMessageContext()->setF(
 318                     Inkscape::NORMAL_MESSAGE,
 319                     "<b>%s%s</b>%s. %s", c,
 320                     (pick == SP_DROPPER_PICK_VISIBLE)? "" : alpha,
 321                     where, message
 322                     );
 323
 324                 g_free(where);
 325                 g_free(alpha);
 326
 327                 ret = TRUE;
 328             }
 329             break;
 330         case GDK_BUTTON_RELEASE:
 331             if (event->button.button == 1 && !event_context->space_panning)
 332             {
 333                 sp_canvas_item_hide(dc->area);
 334                 dc->dragging = FALSE;
 335
 336                                 if (dc->grabbed) {
 337                                         sp_canvas_item_ungrab(dc->grabbed, event->button.time);
 338                                         dc->grabbed = NULL;
 339                                 }
 340
 341                 double alpha_to_set = setalpha? dc->alpha : 1.0;
 342
 343                 // do the actual color setting
 344                 sp_desktop_set_color(desktop,
 345                                      (event->button.state & GDK_MOD1_MASK)?
 346                                      ColorRGBA(1 - dc->R, 1 - dc->G, 1 - dc->B, alpha_to_set) : ColorRGBA(dc->R, dc->G, dc->B, alpha_to_set),
 347                                      false,  !(event->button.state & GDK_SHIFT_MASK));
 348
 349                 // REJON: set aux. toolbar input to hex color!
 350
 351
 352                 if (!(sp_desktop_selection(desktop)->isEmpty())) {
 353                     sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_DROPPER,
 354                                      _("Set picked color"));
 355                 }
 356
 357                 ret = TRUE;
 358             }
 359             break;
 360         case GDK_KEY_PRESS:
 361             switch (get_group0_keyval(&event->key)) {
 362                 case GDK_Up:
 363                 case GDK_Down:
 364                 case GDK_KP_Up:
 365                 case GDK_KP_Down:
 366                     // prevent the zoom field from activation
 367                     if (!MOD__CTRL_ONLY) {
 368                         ret = TRUE;
 369                     }
 370                     break;
 371                 case GDK_Escape:
 372                     sp_desktop_selection(desktop)->clear();
 373                 default:
 374                     break;
 375             }
 376             break;
 377         default:
 378             break;
 379     }
 380
 381     if (!ret) {
 382         if (((SPEventContextClass *) parent_class)->root_handler) {
 383             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 384         }
 385     }
 386
 387     return ret;
 388 }
 389
 390
 391 /*
 392   Local Variables:
 393   mode:c++
 394   c-file-style:"stroustrup"
 395   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 396   indent-tabs-mode:nil
 397   fill-column:99
 398   End:
 399 */
 400 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :