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 "prefs-utils.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     if (prefs_get_int_attribute("tools.dropper", "selcue", 0) != 0) {
 118         ec->enableSelectionCue();
 119     }
 120
 121     if (prefs_get_int_attribute("tools.dropper", "gradientdrag", 0) != 0) {
 122         ec->enableGrDrag();
 123     }
 124 }
 125
 126 static void sp_dropper_context_finish(SPEventContext *ec)
 127 {
 128     SPDropperContext *dc = SP_DROPPER_CONTEXT(ec);
 129
 130     ec->enableGrDrag(false);
 131
 132     if (dc->area) {
 133         gtk_object_destroy(GTK_OBJECT(dc->area));
 134         dc->area = NULL;
 135     }
 136 }
 137
 138
 139 /**
 140  * Returns the current dropper context color.
 141  */
 142 guint32 sp_dropper_context_get_color(SPEventContext *ec)
 143 {
 144     SPDropperContext *dc = SP_DROPPER_CONTEXT(ec);
 145
 146     int pick = prefs_get_int_attribute("tools.dropper", "pick",
 147                                        SP_DROPPER_PICK_VISIBLE);
 148     int setalpha = prefs_get_int_attribute("tools.dropper", "setalpha", 1);
 149
 150     return SP_RGBA32_F_COMPOSE(dc->R, dc->G, dc->B,
 151         (pick == SP_DROPPER_PICK_ACTUAL && setalpha) ? dc->alpha : 1.0);
 152 }
 153
 154
 155 static gint sp_dropper_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 156 {
 157     SPDropperContext *dc = (SPDropperContext *) event_context;
 158     int ret = FALSE;
 159     SPDesktop *desktop = event_context->desktop;
 160
 161     int pick = prefs_get_int_attribute("tools.dropper", "pick", SP_DROPPER_PICK_VISIBLE);
 162     int setalpha = prefs_get_int_attribute("tools.dropper", "setalpha", 1);
 163
 164     switch (event->type) {
 165         case GDK_BUTTON_PRESS:
 166             if (event->button.button == 1 && !event_context->space_panning) {
 167                 dc->centre = NR::Point(event->button.x, event->button.y);
 168                 dc->dragging = TRUE;
 169                 ret = TRUE;
 170             }
 171             break;
 172         case GDK_MOTION_NOTIFY:
 173             if (event->motion.state & GDK_BUTTON2_MASK) {
 174                 // pass on middle-drag
 175                 ret = FALSE;
 176                 break;
 177             } else if (!event_context->space_panning) {
 178                 // otherwise, constantly calculate color no matter is any button pressed or not
 179
 180                 double rw = 0.0;
 181                 double W(0), R(0), G(0), B(0), A(0);
 182
 183                 if (dc->dragging) {
 184                     // calculate average
 185
 186                     // radius
 187                     rw = std::min(NR::L2(NR::Point(event->button.x, event->button.y) - dc->centre), 400.0);
 188
 189                     if (rw == 0) { // happens sometimes, little idea why...
 190                         break;
 191                     }
 192
 193                     NR::Point const cd = desktop->w2d(dc->centre);
 194                     NR::Matrix const w2dt = desktop->w2d();
 195                     const double scale = rw * NR::expansion(w2dt);
 196                     NR::Matrix const sm( NR::scale(scale, scale) * NR::translate(cd) );
 197                     sp_canvas_item_affine_absolute(dc->area, sm);
 198                     sp_canvas_item_show(dc->area);
 199
 200                     /* Get buffer */
 201                     const int x0 = (int) floor(dc->centre[NR::X] - rw);
 202                     const int y0 = (int) floor(dc->centre[NR::Y] - rw);
 203                     const int x1 = (int) ceil(dc->centre[NR::X] + rw);
 204                     const int y1 = (int) ceil(dc->centre[NR::Y] + rw);
 205
 206                     if ((x1 > x0) && (y1 > y0)) {
 207                         NRPixBlock pb;
 208                         nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x0, y0, x1, y1, TRUE);
 209                         /* fixme: (Lauris) */
 210                         sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(desktop)), &pb);
 211                         for (int y = y0; y < y1; y++) {
 212                             const unsigned char *s = NR_PIXBLOCK_PX(&pb) + (y - y0) * pb.rs;
 213                             for (int x = x0; x < x1; x++) {
 214                                 const double dx = x - dc->centre[NR::X];
 215                                 const double dy = y - dc->centre[NR::Y];
 216                                 const double w = exp(-((dx * dx) + (dy * dy)) / (rw * rw));
 217                                 W += w;
 218                                 R += w * s[0];
 219                                 G += w * s[1];
 220                                 B += w * s[2];
 221                                 A += w * s[3];
 222                                 s += 4;
 223                             }
 224                         }
 225                         nr_pixblock_release(&pb);
 226
 227                         R = (R + 0.001) / (255.0 * W);
 228                         G = (G + 0.001) / (255.0 * W);
 229                         B = (B + 0.001) / (255.0 * W);
 230                         A = (A + 0.001) / (255.0 * W);
 231
 232                         R = CLAMP(R, 0.0, 1.0);
 233                         G = CLAMP(G, 0.0, 1.0);
 234                         B = CLAMP(B, 0.0, 1.0);
 235                         A = CLAMP(A, 0.0, 1.0);
 236                     }
 237
 238                 } else {
 239                     // pick single pixel
 240                     NRPixBlock pb;
 241                     int x = (int) floor(event->button.x);
 242                     int y = (int) floor(event->button.y);
 243                     nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x, y, x+1, y+1, TRUE);
 244                     sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(desktop)), &pb);
 245                     const unsigned char *s = NR_PIXBLOCK_PX(&pb);
 246
 247                     R = s[0] / 255.0;
 248                     G = s[1] / 255.0;
 249                     B = s[2] / 255.0;
 250                     A = s[3] / 255.0;
 251                 }
 252
 253                 if (pick == SP_DROPPER_PICK_VISIBLE) {
 254                     // compose with page color
 255                     guint32 bg = sp_desktop_namedview(desktop)->pagecolor;
 256                     R = R + (SP_RGBA32_R_F(bg)) * (1 - A);
 257                     G = G + (SP_RGBA32_G_F(bg)) * (1 - A);
 258                     B = B + (SP_RGBA32_B_F(bg)) * (1 - A);
 259                     A = 1.0;
 260                 } else {
 261                     // un-premultiply color channels
 262                     if (A > 0) {
 263                         R /= A;
 264                         G /= A;
 265                         B /= A;
 266                     }
 267                 }
 268
 269                 if (fabs(A) < 1e-4) {
 270                     A = 0; // suppress exponentials, CSS does not allow that
 271                 }
 272
 273                 // remember color
 274                 dc->R = R;
 275                 dc->G = G;
 276                 dc->B = B;
 277                 dc->alpha = A;
 278
 279                 // status message
 280                 double alpha_to_set = setalpha? dc->alpha : 1.0;
 281                 guint32 c32 = SP_RGBA32_F_COMPOSE(R, G, B, alpha_to_set);
 282
 283                 gchar c[64];
 284                 sp_svg_write_color(c, sizeof(c), c32);
 285
 286                 // alpha of color under cursor, to show in the statusbar
 287                 // locale-sensitive printf is OK, since this goes to the UI, not into SVG
 288                 gchar *alpha = g_strdup_printf(_(" alpha %.3g"), alpha_to_set);
 289                 // where the color is picked, to show in the statusbar
 290                 gchar *where = dc->dragging ? g_strdup_printf(_(", averaged with radius %d"), (int) rw) : g_strdup_printf(_(" under cursor"));
 291                 // message, to show in the statusbar
 292                 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");
 293                 event_context->defaultMessageContext()->setF(
 294                     Inkscape::NORMAL_MESSAGE,
 295                     "<b>%s%s</b>%s. %s", c,
 296                     (pick == SP_DROPPER_PICK_VISIBLE)? "" : alpha,
 297                     where, message
 298                     );
 299
 300                 g_free(where);
 301                 g_free(alpha);
 302
 303                 ret = TRUE;
 304             }
 305             break;
 306         case GDK_BUTTON_RELEASE:
 307             if (event->button.button == 1 && !event_context->space_panning)
 308             {
 309                 sp_canvas_item_hide(dc->area);
 310                 dc->dragging = FALSE;
 311
 312                 double alpha_to_set = setalpha? dc->alpha : 1.0;
 313
 314                 // do the actual color setting
 315                 sp_desktop_set_color(desktop,
 316                                      (event->button.state & GDK_MOD1_MASK)?
 317                                      ColorRGBA(1 - dc->R, 1 - dc->G, 1 - dc->B, alpha_to_set) : ColorRGBA(dc->R, dc->G, dc->B, alpha_to_set),
 318                                      false,  !(event->button.state & GDK_SHIFT_MASK));
 319
 320                 // REJON: set aux. toolbar input to hex color!
 321
 322
 323                 if (!(sp_desktop_selection(desktop)->isEmpty())) {
 324                     sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_DROPPER,
 325                                      _("Set picked color"));
 326                 }
 327
 328                 ret = TRUE;
 329             }
 330             break;
 331         case GDK_KEY_PRESS:
 332             switch (get_group0_keyval(&event->key)) {
 333                 case GDK_Up:
 334                 case GDK_Down:
 335                 case GDK_KP_Up:
 336                 case GDK_KP_Down:
 337                     // prevent the zoom field from activation
 338                     if (!MOD__CTRL_ONLY) {
 339                         ret = TRUE;
 340                     }
 341                     break;
 342                 case GDK_Escape:
 343                     sp_desktop_selection(desktop)->clear();
 344                 default:
 345                     break;
 346             }
 347             break;
 348         default:
 349             break;
 350     }
 351
 352     if (!ret) {
 353         if (((SPEventContextClass *) parent_class)->root_handler) {
 354             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 355         }
 356     }
 357
 358     return ret;
 359 }
 360
 361
 362 /*
 363   Local Variables:
 364   mode:c++
 365   c-file-style:"stroustrup"
 366   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 367   indent-tabs-mode:nil
 368   fill-column:99
 369   End:
 370 */
 371 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :