src/display/sodipodi-ctrl.cpp

   1 #define INKSCAPE_CTRL_C
   2
   3 /*
   4  * SPCtrl
   5  *
   6  * We render it by hand to reduce allocing/freeing svps & to get clean
   7  *    (non-aa) images
   8  *
   9  */
  10
  11 #include "sp-canvas-util.h"
  12 #include "display-forward.h"
  13 #include "sodipodi-ctrl.h"
  14
  15 enum {
  16         ARG_0,
  17         ARG_SHAPE,
  18         ARG_MODE,
  19         ARG_ANCHOR,
  20         ARG_SIZE,
  21         ARG_FILLED,
  22         ARG_FILL_COLOR,
  23         ARG_STROKED,
  24         ARG_STROKE_COLOR,
  25         ARG_PIXBUF
  26 };
  27
  28
  29 static void sp_ctrl_class_init (SPCtrlClass *klass);
  30 static void sp_ctrl_init (SPCtrl *ctrl);
  31 static void sp_ctrl_destroy (GtkObject *object);
  32 static void sp_ctrl_set_arg (GtkObject *object, GtkArg *arg, guint arg_id);
  33
  34 static void sp_ctrl_update (SPCanvasItem *item, NR::Matrix const &affine, unsigned int flags);
  35 static void sp_ctrl_render (SPCanvasItem *item, SPCanvasBuf *buf);
  36
  37 static double sp_ctrl_point (SPCanvasItem *item, NR::Point p, SPCanvasItem **actual_item);
  38
  39
  40 static SPCanvasItemClass *parent_class;
  41
  42 GtkType
  43 sp_ctrl_get_type (void)
  44 {
  45         static GtkType ctrl_type = 0;
  46         if (!ctrl_type) {
  47                 static const GTypeInfo ctrl_info = {
  48                         sizeof (SPCtrlClass),
  49                         NULL,   /* base_init */
  50                         NULL,   /* base_finalize */
  51                         (GClassInitFunc) sp_ctrl_class_init,
  52                         NULL,   /* class_finalize */
  53                         NULL,   /* class_data */
  54                         sizeof (SPCtrl),
  55                         0,      /* n_preallocs */
  56                         (GInstanceInitFunc) sp_ctrl_init,
  57                         NULL
  58                 };
  59                 ctrl_type = g_type_register_static (SP_TYPE_CANVAS_ITEM, "SPCtrl", &ctrl_info, (GTypeFlags)0);
  60         }
  61         return ctrl_type;
  62 }
  63
  64 static void
  65 sp_ctrl_class_init (SPCtrlClass *klass)
  66 {
  67         GtkObjectClass *object_class;
  68         SPCanvasItemClass *item_class;
  69
  70         object_class = (GtkObjectClass *) klass;
  71         item_class = (SPCanvasItemClass *) klass;
  72
  73         parent_class = (SPCanvasItemClass *)gtk_type_class (sp_canvas_item_get_type ());
  74
  75         gtk_object_add_arg_type ("SPCtrl::shape", GTK_TYPE_INT, GTK_ARG_READWRITE, ARG_SHAPE);
  76         gtk_object_add_arg_type ("SPCtrl::mode", GTK_TYPE_INT, GTK_ARG_READWRITE, ARG_MODE);
  77         gtk_object_add_arg_type ("SPCtrl::anchor", GTK_TYPE_ANCHOR_TYPE, GTK_ARG_READWRITE, ARG_ANCHOR);
  78         gtk_object_add_arg_type ("SPCtrl::size", GTK_TYPE_DOUBLE, GTK_ARG_READWRITE, ARG_SIZE);
  79         gtk_object_add_arg_type ("SPCtrl::pixbuf", GTK_TYPE_POINTER, GTK_ARG_READWRITE, ARG_PIXBUF);
  80         gtk_object_add_arg_type ("SPCtrl::filled", GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_FILLED);
  81         gtk_object_add_arg_type ("SPCtrl::fill_color", GTK_TYPE_INT, GTK_ARG_READWRITE, ARG_FILL_COLOR);
  82         gtk_object_add_arg_type ("SPCtrl::stroked", GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_STROKED);
  83         gtk_object_add_arg_type ("SPCtrl::stroke_color", GTK_TYPE_INT, GTK_ARG_READWRITE, ARG_STROKE_COLOR);
  84
  85         object_class->destroy = sp_ctrl_destroy;
  86         object_class->set_arg = sp_ctrl_set_arg;
  87
  88         item_class->update = sp_ctrl_update;
  89         item_class->render = sp_ctrl_render;
  90         item_class->point = sp_ctrl_point;
  91 }
  92
  93 static void
  94 sp_ctrl_init (SPCtrl *ctrl)
  95 {
  96         ctrl->shape = SP_CTRL_SHAPE_SQUARE;
  97         ctrl->mode = SP_CTRL_MODE_COLOR;
  98         ctrl->anchor = GTK_ANCHOR_CENTER;
  99         ctrl->span = 3;
 100         ctrl->defined = TRUE;
 101         ctrl->shown = FALSE;
 102         ctrl->build = FALSE;
 103         ctrl->filled = 1;
 104         ctrl->stroked = 0;
 105         ctrl->fill_color = 0x000000ff;
 106         ctrl->stroke_color = 0x000000ff;
 107
 108         ctrl->box.x0 = ctrl->box.y0 = ctrl->box.x1 = ctrl->box.y1 = 0;
 109         ctrl->cache = NULL;
 110         ctrl->pixbuf = NULL;
 111 }
 112
 113 static void
 114 sp_ctrl_destroy (GtkObject *object)
 115 {
 116         SPCtrl *ctrl;
 117
 118         g_return_if_fail (object != NULL);
 119         g_return_if_fail (SP_IS_CTRL (object));
 120
 121         ctrl = SP_CTRL (object);
 122
 123         if (GTK_OBJECT_CLASS (parent_class)->destroy)
 124                 (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
 125 }
 126
 127 static void
 128 sp_ctrl_set_arg (GtkObject *object, GtkArg *arg, guint arg_id)
 129 {
 130         SPCanvasItem *item;
 131         SPCtrl *ctrl;
 132         GdkPixbuf * pixbuf = NULL;
 133
 134         item = SP_CANVAS_ITEM (object);
 135         ctrl = SP_CTRL (object);
 136
 137         switch (arg_id) {
 138         case ARG_SHAPE:
 139                 ctrl->shape = (SPCtrlShapeType)(GTK_VALUE_INT (*arg));
 140                 ctrl->build = FALSE;
 141                 sp_canvas_item_request_update (item);
 142                 break;
 143         case ARG_MODE:
 144                 ctrl->mode = (SPCtrlModeType)(GTK_VALUE_INT (*arg));
 145                 ctrl->build = FALSE;
 146                 sp_canvas_item_request_update (item);
 147                 break;
 148         case ARG_ANCHOR:
 149                 ctrl->anchor = (GtkAnchorType)(GTK_VALUE_INT (*arg));
 150                 ctrl->build = FALSE;
 151                 sp_canvas_item_request_update (item);
 152                 break;
 153         case ARG_SIZE:
 154                 ctrl->span = (gint) ((GTK_VALUE_DOUBLE (*arg) - 1.0) / 2.0 + 0.5);
 155                 ctrl->defined = (ctrl->span > 0);
 156                 ctrl->build = FALSE;
 157                 sp_canvas_item_request_update (item);
 158                 break;
 159         case ARG_FILLED:
 160                 ctrl->filled = GTK_VALUE_BOOL (*arg);
 161                 ctrl->build = FALSE;
 162                 sp_canvas_item_request_update (item);
 163                 break;
 164         case ARG_FILL_COLOR:
 165                 ctrl->fill_color = GTK_VALUE_INT (*arg);
 166                 ctrl->build = FALSE;
 167                 sp_canvas_item_request_update (item);
 168                 break;
 169         case ARG_STROKED:
 170                 ctrl->stroked = GTK_VALUE_BOOL (*arg);
 171                 ctrl->build = FALSE;
 172                 sp_canvas_item_request_update (item);
 173                 break;
 174         case ARG_STROKE_COLOR:
 175                 ctrl->stroke_color = GTK_VALUE_INT (*arg);
 176                 ctrl->build = FALSE;
 177                 sp_canvas_item_request_update (item);
 178                 break;
 179         case ARG_PIXBUF:
 180                 pixbuf  = (GdkPixbuf*)(GTK_VALUE_POINTER (*arg));
 181                 if (gdk_pixbuf_get_has_alpha (pixbuf)) {
 182                         ctrl->pixbuf = pixbuf;
 183                 } else {
 184                         ctrl->pixbuf = gdk_pixbuf_add_alpha (pixbuf, FALSE, 0, 0, 0);
 185                         gdk_pixbuf_unref (pixbuf);
 186                 }
 187                 ctrl->build = FALSE;
 188                 break;
 189         default:
 190                 break;
 191         }
 192 }
 193
 194 static void
 195 sp_ctrl_update (SPCanvasItem *item, NR::Matrix const &affine, unsigned int flags)
 196 {
 197         SPCtrl *ctrl;
 198         gint x, y;
 199
 200         ctrl = SP_CTRL (item);
 201
 202         if (((SPCanvasItemClass *) parent_class)->update)
 203                 (* ((SPCanvasItemClass *) parent_class)->update) (item, affine, flags);
 204
 205         sp_canvas_item_reset_bounds (item);
 206
 207         if (ctrl->shown) {
 208                 sp_canvas_request_redraw (item->canvas, ctrl->box.x0, ctrl->box.y0, ctrl->box.x1 + 1, ctrl->box.y1 + 1);
 209         }
 210
 211         if (!ctrl->defined) return;
 212
 213         x = (gint) ((affine[4] > 0) ? (affine[4] + 0.5) : (affine[4] - 0.5)) - ctrl->span;
 214         y = (gint) ((affine[5] > 0) ? (affine[5] + 0.5) : (affine[5] - 0.5)) - ctrl->span;
 215
 216         switch (ctrl->anchor) {
 217         case GTK_ANCHOR_N:
 218         case GTK_ANCHOR_CENTER:
 219         case GTK_ANCHOR_S:
 220                 break;
 221         case GTK_ANCHOR_NW:
 222         case GTK_ANCHOR_W:
 223         case GTK_ANCHOR_SW:
 224                 x += ctrl->span;
 225                 break;
 226         case GTK_ANCHOR_NE:
 227         case GTK_ANCHOR_E:
 228         case GTK_ANCHOR_SE:
 229                 x -= (ctrl->span + 1);
 230                 break;
 231         }
 232
 233         switch (ctrl->anchor) {
 234         case GTK_ANCHOR_W:
 235         case GTK_ANCHOR_CENTER:
 236         case GTK_ANCHOR_E:
 237                 break;
 238         case GTK_ANCHOR_NW:
 239         case GTK_ANCHOR_N:
 240         case GTK_ANCHOR_NE:
 241                 y += ctrl->span;
 242                 break;
 243         case GTK_ANCHOR_SW:
 244         case GTK_ANCHOR_S:
 245         case GTK_ANCHOR_SE:
 246                 y -= (ctrl->span + 1);
 247                 break;
 248         }
 249
 250         ctrl->box.x0 = x;
 251         ctrl->box.y0 = y;
 252         ctrl->box.x1 = ctrl->box.x0 + 2 * ctrl->span;
 253         ctrl->box.y1 = ctrl->box.y0 + 2 * ctrl->span;
 254
 255         sp_canvas_update_bbox (item, ctrl->box.x0, ctrl->box.y0, ctrl->box.x1 + 1, ctrl->box.y1 + 1);
 256
 257 }
 258
 259 static double
 260 sp_ctrl_point (SPCanvasItem *item, NR::Point p, SPCanvasItem **actual_item)
 261 {
 262         SPCtrl *ctrl = SP_CTRL (item);
 263
 264         *actual_item = item;
 265
 266         const double x = p[NR::X];
 267         const double y = p[NR::Y];
 268
 269         if ((x >= ctrl->box.x0) && (x <= ctrl->box.x1) && (y >= ctrl->box.y0) && (y <= ctrl->box.y1)) return 0.0;
 270
 271         return 1e18;
 272 }
 273
 274 static void
 275 sp_ctrl_build_cache (SPCtrl *ctrl)
 276 {
 277         guchar * p, *q;
 278         gint size, x, y, z, s, a, side, c;
 279         guint8 fr, fg, fb, fa, sr, sg, sb, sa;
 280
 281         if (ctrl->filled) {
 282                fr = (ctrl->fill_color >> 24) & 0xff;
 283                fg = (ctrl->fill_color >> 16) & 0xff;
 284                fb = (ctrl->fill_color >> 8) & 0xff;
 285                fa = (ctrl->fill_color) & 0xff;
 286         } else { fr = 0x00; fg = 0x00; fb = 0x00; fa = 0x00; }
 287         if (ctrl->stroked) {
 288                 sr = (ctrl->stroke_color >> 24) & 0xff;
 289                 sg = (ctrl->stroke_color >> 16) & 0xff;
 290                 sb = (ctrl->stroke_color >> 8) & 0xff;
 291                 sa = (ctrl->stroke_color) & 0xff;
 292         } else { sr = fr; sg = fg; sb = fb; sa = fa; }
 293
 294
 295         side = (ctrl->span * 2 +1);
 296         c = ctrl->span ;
 297         g_free (ctrl->cache);
 298         size = (side) * (side) * 4;
 299         ctrl->cache = (guchar*)g_malloc (size);
 300         if (side < 2) return;
 301
 302         switch (ctrl->shape) {
 303         case SP_CTRL_SHAPE_SQUARE:
 304                 p = ctrl->cache;
 305                 for (x=0; x < side; x++) { *p++ = sr; *p++ = sg; *p++ = sb; *p++ = sa; }
 306                 for (y = 2; y < side; y++) {
 307                         *p++ = sr; *p++ = sg; *p++ = sb; *p++ = sa;
 308                         for (x=2; x < side; x++) { *p++ = fr; *p++ = fg; *p++ = fb; *p++ = fa; }
 309                         *p++ = sr; *p++ = sg; *p++ = sb; *p++ = sa;
 310                 }
 311                 for (x=0; x < side; x++) { *p++ = sr; *p++ = sg; *p++ = sb; *p++ = sa; }
 312                 ctrl->build = TRUE;
 313                 break;
 314         case SP_CTRL_SHAPE_DIAMOND:
 315                 p = ctrl->cache;
 316                 for (y = 0; y < side; y++) {
 317                         z = abs (c - y);
 318                         for (x = 0; x < z; x++) {*p++ = 0x00; *p++ = 0x00; *p++ = 0x00; *p++ = 0x00;}
 319                         *p++ = sr; *p++ = sg; *p++ = sb; *p++ = sa; x++;
 320                         for (; x < side - z -1; x++) { *p++ = fr; *p++ = fg; *p++ = fb; *p++ = fa; }
 321                         if (z != c) {*p++ = sr; *p++ = sg; *p++ = sb; *p++ = sa; x++;}
 322                         for (; x < side; x++) {*p++ = 0x00; *p++ = 0x00; *p++ = 0x00; *p++ = 0x00;}
 323                 }
 324                 break;
 325         case SP_CTRL_SHAPE_CIRCLE:
 326                 p = ctrl->cache;
 327                 q = p + size -1;
 328                 s = -1;
 329                 for (y = 0; y <= c ; y++) {
 330                         a = abs (c - y);
 331                         z = (gint)(0.0 + sqrt ((c+.4)*(c+.4) - a*a));
 332                         x = 0;
 333                         while (x < c-z) {
 334                                 *p++ = 0x00; *p++ = 0x00; *p++ = 0x00; *p++ = 0x00;
 335                                 *q-- = 0x00; *q-- = 0x00; *q-- = 0x00; *q-- = 0x00;
 336                                 x++;
 337                         }
 338                         do {
 339                                 *p++ = sr; *p++ = sg; *p++ = sb; *p++ = sa;
 340                                 *q-- = sa; *q-- = sb; *q-- = sg; *q-- = sr;
 341                                 x++;
 342                         } while (x < c-s);
 343                         while (x < MIN(c+s+1, c+z)) {
 344                                 *p++ = fr;   *p++ = fg;   *p++ = fb;   *p++ = fa;
 345                                 *q-- = fa;   *q-- = fb;   *q-- = fg;   *q-- = fr;
 346                                 x++;
 347                         }
 348                         do {
 349                                 *p++ = sr;   *p++ = sg;   *p++ = sb;   *p++ = sa;
 350                                 *q-- = sa; *q-- = sb; *q-- = sg; *q-- = sr;
 351                                 x++;
 352                         } while (x <= c+z);
 353                         while (x < side) {
 354                                 *p++ = 0x00; *p++ = 0x00; *p++ = 0x00; *p++ = 0x00;
 355                                 *q-- = 0x00; *q-- = 0x00; *q-- = 0x00; *q-- = 0x00;
 356                                 x++;
 357                         }
 358                         s = z;
 359                 }
 360                 ctrl->build = TRUE;
 361                 break;
 362         case SP_CTRL_SHAPE_CROSS:
 363                 p = ctrl->cache;
 364                 for (y = 0; y < side; y++) {
 365                         z = abs (c - y);
 366                         for (x = 0; x < c-z; x++) {*p++ = 0x00; *p++ = 0x00; *p++ = 0x00; *p++ = 0x00;}
 367                         *p++ = sr; *p++ = sg; *p++ = sb; *p++ = sa; x++;
 368                         for (; x < c + z; x++) {*p++ = 0x00; *p++ = 0x00; *p++ = 0x00; *p++ = 0x00;}
 369                         if (z != 0) {*p++ = sr; *p++ = sg; *p++ = sb; *p++ = sa; x++;}
 370                         for (; x < side; x++) {*p++ = 0x00; *p++ = 0x00; *p++ = 0x00; *p++ = 0x00;}
 371                 }
 372                 ctrl->build = TRUE;
 373                 break;
 374         case SP_CTRL_SHAPE_BITMAP:
 375                 if (ctrl->pixbuf) {
 376                         unsigned char *px;
 377                         unsigned int rs;
 378                         px = gdk_pixbuf_get_pixels (ctrl->pixbuf);
 379                         rs = gdk_pixbuf_get_rowstride (ctrl->pixbuf);
 380                         for (y = 0; y < side; y++){
 381                                 unsigned char *s, *d;
 382                                 s = px + y * rs;
 383                                 d = ctrl->cache + 4 * side * y;
 384                                 for (x = 0; x < side; x++) {
 385                                         if (s[3] < 0x80) {
 386                                                 d[0] = 0x00;
 387                                                 d[1] = 0x00;
 388                                                 d[2] = 0x00;
 389                                                 d[3] = 0x00;
 390                                         } else if (s[0] < 0x80) {
 391                                                 d[0] = sr;
 392                                                 d[1] = sg;
 393                                                 d[2] = sb;
 394                                                 d[3] = sa;
 395                                         } else {
 396                                                 d[0] = fr;
 397                                                 d[1] = fg;
 398                                                 d[2] = fb;
 399                                                 d[3] = fa;
 400                                         }
 401                                         s += 4;
 402                                         d += 4;
 403                                 }
 404                         }
 405                 } else {
 406                         g_print ("control has no pixmap\n");
 407                 }
 408                 ctrl->build = TRUE;
 409                 break;
 410         case SP_CTRL_SHAPE_IMAGE:
 411                 if (ctrl->pixbuf) {
 412                         guint r = gdk_pixbuf_get_rowstride (ctrl->pixbuf);
 413                         guchar * pix;
 414                         q = gdk_pixbuf_get_pixels (ctrl->pixbuf);
 415                         p = ctrl->cache;
 416                         for (y = 0; y < side; y++){
 417                                 pix = q + (y * r);
 418                                 for (x = 0; x < side; x++) {
 419                                         *p++ = *pix++;
 420                                         *p++ = *pix++;
 421                                         *p++ = *pix++;
 422                                         *p++ = *pix++;
 423                                 }
 424                         }
 425                 } else { g_print ("control has no pixmap\n"); }
 426                 ctrl->build = TRUE;
 427                 break;
 428         default:
 429                 break;
 430         }
 431
 432 }
 433
 434 // composite background, foreground, alpha for xor mode
 435 #define COMPOSE_X(b,f,a) ( ( ((guchar) b) * ((guchar) (0xff - a)) + ((guchar) ((b ^ ~f) + b/4 - (b>127? 63 : 0))) * ((guchar) a) ) / 0xff )
 436 // composite background, foreground, alpha for color mode
 437 #define COMPOSE_N(b,f,a) ( ( ((guchar) b) * ((guchar) (0xff - a)) + ((guchar) f) * ((guchar) a) ) / 0xff )
 438
 439 static void
 440 sp_ctrl_render (SPCanvasItem *item, SPCanvasBuf *buf)
 441 {
 442         gint y0, y1, y, x0,x1,x;
 443         guchar * p, * q, a;
 444
 445         SPCtrl *ctrl = SP_CTRL (item);
 446
 447         if (!ctrl->defined) return;
 448         if ((!ctrl->filled) && (!ctrl->stroked)) return;
 449
 450         sp_canvas_prepare_buffer (buf);
 451
 452         // the control-image is rendered into ctrl->cache
 453         if (!ctrl->build) sp_ctrl_build_cache (ctrl);
 454
 455         // then we render from ctrl->cache
 456         y0 = MAX (ctrl->box.y0, buf->rect.y0);
 457         y1 = MIN (ctrl->box.y1, buf->rect.y1 - 1);
 458         x0 = MAX (ctrl->box.x0, buf->rect.x0);
 459         x1 = MIN (ctrl->box.x1, buf->rect.x1 - 1);
 460
 461         bool colormode;
 462
 463         for (y = y0; y <= y1; y++) {
 464                 p = buf->buf +    (y - buf->rect.y0) * buf->buf_rowstride + (x0 - buf->rect.x0) * 3;
 465                 q = ctrl->cache + ((y - ctrl->box.y0) * (ctrl->span*2+1) + (x0 - ctrl->box.x0)) * 4;
 466                 for (x = x0; x <= x1; x++) {
 467                         a = *(q + 3);
 468                         // 00000000 is the only way to get invisible; all other colors with alpha 00 are treated as mode_color with alpha ff
 469                         colormode = false;
 470                         if (a == 0x00 && !(q[0] == 0x00 && q[1] == 0x00 && q[2] == 0x00)) {
 471                                 a = 0xff;
 472                                 colormode = true;
 473                         }
 474                         if (ctrl->mode == SP_CTRL_MODE_COLOR || colormode) {
 475                                 p[0] = COMPOSE_N (p[0], q[0], a);
 476                                 p[1] = COMPOSE_N (p[1], q[1], a);
 477                                 p[2] = COMPOSE_N (p[2], q[2], a);
 478                                 q += 4;
 479                                 p += 3;
 480                         } else if (ctrl->mode == SP_CTRL_MODE_XOR) {
 481                                 p[0] = COMPOSE_X (p[0], q[0], a);
 482                                 p[1] = COMPOSE_X (p[1], q[1], a);
 483                                 p[2] = COMPOSE_X (p[2], q[2], a);
 484                                 q += 4;
 485                                 p += 3;
 486                         }
 487                 }
 488         }
 489         ctrl->shown = TRUE;
 490 }
 491
 492 void SPCtrl::moveto (NR::Point const p) {
 493         sp_canvas_item_affine_absolute (SP_CANVAS_ITEM (this), NR::Matrix(NR::translate (p)));
 494 }