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