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 color.
 147  */
 148 guint32 sp_dropper_context_get_color(SPEventContext *ec)
 149 {
 150     SPDropperContext *dc = SP_DROPPER_CONTEXT(ec);
 151     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 152
 153     int pick = prefs->getInt("/tools/dropper/pick",
 154                                        SP_DROPPER_PICK_VISIBLE);
 155     bool setalpha = prefs->getBool("/tools/dropper/setalpha", true);
 156
 157     return SP_RGBA32_F_COMPOSE(dc->R, dc->G, dc->B,
 158         (pick == SP_DROPPER_PICK_ACTUAL && setalpha) ? dc->alpha : 1.0);
 159 }
 160
 161
 162 static gint sp_dropper_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 163 {
 164     SPDropperContext *dc = (SPDropperContext *) event_context;
 165     int ret = FALSE;
 166     SPDesktop *desktop = event_context->desktop;
 167     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 168
 169     int pick = prefs->getInt("/tools/dropper/pick", SP_DROPPER_PICK_VISIBLE);
 170     bool setalpha = prefs->getBool("/tools/dropper/setalpha", true);
 171
 172     switch (event->type) {
 173         case GDK_BUTTON_PRESS:
 174             if (event->button.button == 1 && !event_context->space_panning) {
 175                 dc->centre = Geom::Point(event->button.x, event->button.y);
 176                 dc->dragging = TRUE;
 177                 ret = TRUE;
 178             }
 179
 180                         sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 181                                                                 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,
 182                                                                 NULL, event->button.time);
 183                         dc->grabbed = SP_CANVAS_ITEM(desktop->acetate);
 184
 185             break;
 186         case GDK_MOTION_NOTIFY:
 187             if (event->motion.state & GDK_BUTTON2_MASK) {
 188                 // pass on middle-drag
 189                 ret = FALSE;
 190                 break;
 191             } else if (!event_context->space_panning) {
 192                 // otherwise, constantly calculate color no matter is any button pressed or not
 193
 194                 double rw = 0.0;
 195                 double W(0), R(0), G(0), B(0), A(0);
 196
 197                 if (dc->dragging) {
 198                     // calculate average
 199
 200                     // radius
 201                     rw = std::min(Geom::L2(Geom::Point(event->button.x, event->button.y) - dc->centre), 400.0);
 202
 203                     if (rw == 0) { // happens sometimes, little idea why...
 204                         break;
 205                     }
 206
 207                     Geom::Point const cd = desktop->w2d(dc->centre);
 208                     Geom::Matrix const w2dt = desktop->w2d();
 209                     const double scale = rw * w2dt.descrim();
 210                     Geom::Matrix const sm( Geom::Scale(scale, scale) * Geom::Translate(cd) );
 211                     sp_canvas_item_affine_absolute(dc->area, sm);
 212                     sp_canvas_item_show(dc->area);
 213
 214                     /* Get buffer */
 215                     const int x0 = (int) floor(dc->centre[Geom::X] - rw);
 216                     const int y0 = (int) floor(dc->centre[Geom::Y] - rw);
 217                     const int x1 = (int) ceil(dc->centre[Geom::X] + rw);
 218                     const int y1 = (int) ceil(dc->centre[Geom::Y] + rw);
 219
 220                     if ((x1 > x0) && (y1 > y0)) {
 221                         NRPixBlock pb;
 222                         nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x0, y0, x1, y1, TRUE);
 223                         /* fixme: (Lauris) */
 224                         sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(desktop)), &pb);
 225                         for (int y = y0; y < y1; y++) {
 226                             const unsigned char *s = NR_PIXBLOCK_PX(&pb) + (y - y0) * pb.rs;
 227                             for (int x = x0; x < x1; x++) {
 228                                 const double dx = x - dc->centre[Geom::X];
 229                                 const double dy = y - dc->centre[Geom::Y];
 230                                 const double w = exp(-((dx * dx) + (dy * dy)) / (rw * rw));
 231                                 W += w;
 232                                 R += w * s[0];
 233                                 G += w * s[1];
 234                                 B += w * s[2];
 235                                 A += w * s[3];
 236                                 s += 4;
 237                             }
 238                         }
 239                         nr_pixblock_release(&pb);
 240
 241                         R = (R + 0.001) / (255.0 * W);
 242                         G = (G + 0.001) / (255.0 * W);
 243                         B = (B + 0.001) / (255.0 * W);
 244                         A = (A + 0.001) / (255.0 * W);
 245
 246                         R = CLAMP(R, 0.0, 1.0);
 247                         G = CLAMP(G, 0.0, 1.0);
 248                         B = CLAMP(B, 0.0, 1.0);
 249                         A = CLAMP(A, 0.0, 1.0);
 250                     }
 251
 252                 } else {
 253                     // pick single pixel
 254                     NRPixBlock pb;
 255                     int x = (int) floor(event->button.x);
 256                     int y = (int) floor(event->button.y);
 257                     nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x, y, x+1, y+1, TRUE);
 258                     sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(desktop)), &pb);
 259                     const unsigned char *s = NR_PIXBLOCK_PX(&pb);
 260
 261                     R = s[0] / 255.0;
 262                     G = s[1] / 255.0;
 263                     B = s[2] / 255.0;
 264                     A = s[3] / 255.0;
 265                 }
 266
 267                 if (pick == SP_DROPPER_PICK_VISIBLE) {
 268                     // compose with page color
 269                     guint32 bg = sp_desktop_namedview(desktop)->pagecolor;
 270                     R = R + (SP_RGBA32_R_F(bg)) * (1 - A);
 271                     G = G + (SP_RGBA32_G_F(bg)) * (1 - A);
 272                     B = B + (SP_RGBA32_B_F(bg)) * (1 - A);
 273                     A = 1.0;
 274                 } else {
 275                     // un-premultiply color channels
 276                     if (A > 0) {
 277                         R /= A;
 278                         G /= A;
 279                         B /= A;
 280                     }
 281                 }
 282
 283                 if (fabs(A) < 1e-4) {
 284                     A = 0; // suppress exponentials, CSS does not allow that
 285                 }
 286
 287                 // remember color
 288                 dc->R = R;
 289                 dc->G = G;
 290                 dc->B = B;
 291                 dc->alpha = A;
 292
 293                 // status message
 294                 double alpha_to_set = setalpha? dc->alpha : 1.0;
 295                 guint32 c32 = SP_RGBA32_F_COMPOSE(R, G, B, alpha_to_set);
 296
 297                 gchar c[64];
 298                 sp_svg_write_color(c, sizeof(c), c32);
 299
 300                 // alpha of color under cursor, to show in the statusbar
 301                 // locale-sensitive printf is OK, since this goes to the UI, not into SVG
 302                 gchar *alpha = g_strdup_printf(_(" alpha %.3g"), alpha_to_set);
 303                 // where the color is picked, to show in the statusbar
 304                 gchar *where = dc->dragging ? g_strdup_printf(_(", averaged with radius %d"), (int) rw) : g_strdup_printf(_(" under cursor"));
 305                 // message, to show in the statusbar
 306                 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");
 307                 event_context->defaultMessageContext()->setF(
 308                     Inkscape::NORMAL_MESSAGE,
 309                     "<b>%s%s</b>%s. %s", c,
 310                     (pick == SP_DROPPER_PICK_VISIBLE)? "" : alpha,
 311                     where, message
 312                     );
 313
 314                 g_free(where);
 315                 g_free(alpha);
 316
 317                 ret = TRUE;
 318             }
 319             break;
 320         case GDK_BUTTON_RELEASE:
 321             if (event->button.button == 1 && !event_context->space_panning)
 322             {
 323                 sp_canvas_item_hide(dc->area);
 324                 dc->dragging = FALSE;
 325
 326                                 if (dc->grabbed) {
 327                                         sp_canvas_item_ungrab(dc->grabbed, event->button.time);
 328                                         dc->grabbed = NULL;
 329                                 }
 330
 331                 double alpha_to_set = setalpha? dc->alpha : 1.0;
 332
 333                 // do the actual color setting
 334                 sp_desktop_set_color(desktop,
 335                                      (event->button.state & GDK_MOD1_MASK)?
 336                                      ColorRGBA(1 - dc->R, 1 - dc->G, 1 - dc->B, alpha_to_set) : ColorRGBA(dc->R, dc->G, dc->B, alpha_to_set),
 337                                      false,  !(event->button.state & GDK_SHIFT_MASK));
 338
 339                 // REJON: set aux. toolbar input to hex color!
 340
 341
 342                 if (!(sp_desktop_selection(desktop)->isEmpty())) {
 343                     sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_DROPPER,
 344                                      _("Set picked color"));
 345                 }
 346
 347                 ret = TRUE;
 348             }
 349             break;
 350         case GDK_KEY_PRESS:
 351             switch (get_group0_keyval(&event->key)) {
 352                 case GDK_Up:
 353                 case GDK_Down:
 354                 case GDK_KP_Up:
 355                 case GDK_KP_Down:
 356                     // prevent the zoom field from activation
 357                     if (!MOD__CTRL_ONLY) {
 358                         ret = TRUE;
 359                     }
 360                     break;
 361                 case GDK_Escape:
 362                     sp_desktop_selection(desktop)->clear();
 363                 default:
 364                     break;
 365             }
 366             break;
 367         default:
 368             break;
 369     }
 370
 371     if (!ret) {
 372         if (((SPEventContextClass *) parent_class)->root_handler) {
 373             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 374         }
 375     }
 376
 377     return ret;
 378 }
 379
 380
 381 /*
 382   Local Variables:
 383   mode:c++
 384   c-file-style:"stroustrup"
 385   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 386   indent-tabs-mode:nil
 387   fill-column:99
 388   End:
 389 */
 390 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :