gimpbrushpipe.c 17.5 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 * Copyright (C) 1999 Adrian Likins and Tor Lillqvist
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

20 21 22 23
#include "config.h"

#include <math.h>
#include <stdio.h>
24
#include <stdlib.h>
25
#include <string.h>
26
#include <ctype.h>
27

28
#include "apptypes.h"
29 30 31 32 33
#include "appenv.h"
#include "brush_header.h"
#include "pattern_header.h"
#include "patterns.h"
#include "gimpbrush.h"
34 35
#include "gimpbrushpipe.h"
#include "gimpbrushpipeP.h"
36 37 38 39
#include "paint_core.h"
#include "gimprc.h"
#include "libgimp/gimpintl.h"

40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59
/* Code duplicated from plug-ins/common/gpb.c...
 * The struct, and code to parse/build it probably should be in libgimp.
 */

/* Parameters related to one single gih file, collected in a struct
 * just for clarity.
 */
#define MAXDIM 4
static struct {
  gint step;
  gint ncells;
  gint dim;
  gint cols;
  gint rows;
  gchar *placement;
  gint rank[MAXDIM];
  gchar *selection[MAXDIM];
} gihparms;


60 61 62 63
static GimpBrushClass* gimp_brush_class;
static GtkObjectClass* gimp_object_class;

static GimpBrush *gimp_brush_pixmap_select_brush (PaintCore *paint_core);
64
static gboolean gimp_brush_pixmap_want_null_motion (PaintCore *paint_core);
65 66 67 68 69 70 71 72

static void paint_line_pixmap_mask(GImage	   *dest,
				   GimpDrawable    *drawable,
				   GimpBrushPixmap *brush,
				   guchar	   *d,
				   int		    x,
				   int              y,
				   int              bytes,
73 74
				   int              width,
				   int              mode);
75

76
static void
77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102
gimp_brush_pixmap_destroy (GtkObject *object)
{
  GimpBrushPixmap *pixmap;

  g_return_if_fail (GIMP_IS_BRUSH_PIXMAP (object));

  pixmap = GIMP_BRUSH_PIXMAP (object);
  
  temp_buf_free (pixmap->pixmap_mask);

  (* GTK_OBJECT_CLASS (gimp_object_class)->destroy) (object);
}

static void
gimp_brush_pixmap_class_init (GimpBrushPixmapClass *klass)
{
  GtkObjectClass *object_class;
  GimpBrushClass *brush_class;
  
  object_class = GTK_OBJECT_CLASS (klass);
  brush_class = GIMP_BRUSH_CLASS (klass);

  gimp_brush_class = gtk_type_class (gimp_brush_get_type ());

  object_class->destroy =  gimp_brush_pixmap_destroy;
  brush_class->select_brush = gimp_brush_pixmap_select_brush;
103
  brush_class->want_null_motion = gimp_brush_pixmap_want_null_motion;
104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130
}

void
gimp_brush_pixmap_init (GimpBrushPixmap *brush)
{
  brush->pixmap_mask = NULL;
  brush->pipe = NULL;
}

GtkType
gimp_brush_pixmap_get_type (void)
{
  static GtkType type=0;
  if(!type){
    GtkTypeInfo info={
      "GimpBrushPixmap",
      sizeof (GimpBrushPixmap),
      sizeof (GimpBrushPixmapClass),
      (GtkClassInitFunc) gimp_brush_pixmap_class_init,
      (GtkObjectInitFunc) gimp_brush_pixmap_init,
     /* reserved_1 */ NULL,
     /* reserved_2 */ NULL,
    (GtkClassInitFunc) NULL};
    type = gtk_type_unique (GIMP_TYPE_BRUSH, &info);
  }
  return type;
}
131

132 133 134
static GimpBrush *
gimp_brush_pixmap_select_brush (PaintCore *paint_core)
{
135
  GimpBrushPipe *pipe;
136
  int i, brushix, ix;
137
  double angle;
138 139 140

  g_return_val_if_fail (GIMP_IS_BRUSH_PIXMAP (paint_core->brush), NULL);

141
  pipe = GIMP_BRUSH_PIXMAP (paint_core->brush)->pipe;
142

143 144
  if (pipe->nbrushes == 1)
    return GIMP_BRUSH (pipe->current);
145

146 147 148 149 150 151
  brushix = 0;
  for (i = 0; i < pipe->dimension; i++)
    {
      switch (pipe->select[i])
	{
	case PIPE_SELECT_CONSTANT:
152
	  ix = pipe->index[i];
153 154
	  break;
	case PIPE_SELECT_INCREMENTAL:
155
	  ix = (pipe->index[i] + 1) % pipe->rank[i];
156 157 158 159
	  break;
	case PIPE_SELECT_ANGULAR:
	  angle = atan2 (paint_core->cury - paint_core->lasty,
			 paint_core->curx - paint_core->lastx);
160 161 162
	  /* Offset angle to be compatible with PSP tubes */
	  angle += G_PI_2;
	  /* Map it to the [0..2*G_PI) interval */
163 164
	  if (angle < 0)
	    angle += 2.*G_PI;
165 166 167
	  else if (angle > 2.*G_PI)
	    angle -= 2.*G_PI;
	  ix = RINT (angle / (2.*G_PI) * pipe->rank[i]);
168 169 170
	  break;
	case PIPE_SELECT_RANDOM:
	  /* This probably isn't the right way */
171
	  ix = rand () % pipe->rank[i];
172 173
	  break;
	case PIPE_SELECT_PRESSURE:
174
	  ix = RINT (paint_core->curpressure * (pipe->rank[i] - 1));
175 176
	  break;
	case PIPE_SELECT_TILT_X:
177
	  ix = RINT (paint_core->curxtilt / 2.0 * pipe->rank[i]) + pipe->rank[i]/2;
178 179
	  break;
	case PIPE_SELECT_TILT_Y:
180
	  ix = RINT (paint_core->curytilt / 2.0 * pipe->rank[i]) + pipe->rank[i]/2;
181 182
	  break;
	}
183 184 185
      pipe->index[i] = BOUNDS (ix, 0, pipe->rank[i]-1);
      brushix += pipe->stride[i] * pipe->index[i];
      /* g_print ("ix at %d: %d, brushix: %d\n", i, ix, brushix); */
186 187
    }

188
  /* Make sure is inside bounds */
189
  brushix = BOUNDS (brushix, 0, pipe->nbrushes-1);
190

191 192 193
  pipe->current = pipe->brushes[brushix];

  return GIMP_BRUSH (pipe->current);
194
}
195

196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215
static gboolean
gimp_brush_pixmap_want_null_motion (PaintCore *paint_core)
{
  GimpBrushPipe *pipe;
  int i;

  g_return_val_if_fail (GIMP_IS_BRUSH_PIXMAP (paint_core->brush), TRUE);

  pipe = GIMP_BRUSH_PIXMAP (paint_core->brush)->pipe;

  if (pipe->nbrushes == 1)
    return TRUE;

  for (i = 0; i < pipe->dimension; i++)
    if (pipe->select[i] == PIPE_SELECT_ANGULAR)
      return FALSE;

  return TRUE;
}

216 217 218
static void
gimp_brush_pipe_destroy(GtkObject *object)
{
219 220 221 222 223 224 225 226 227
  GimpBrushPipe *pipe;
  int i;

  g_return_if_fail (object != NULL);
  g_return_if_fail (GIMP_IS_BRUSH_PIPE (object));

  pipe = GIMP_BRUSH_PIPE (object);

  g_free (pipe->rank);
228
  g_free (pipe->stride);
229 230 231 232 233 234 235 236 237 238

  for (i = 1; i < pipe->nbrushes; i++)
    gimp_object_destroy (pipe->brushes[i]);

  g_free (pipe->brushes);
  g_free (pipe->select);
  g_free (pipe->index);

  if (GTK_OBJECT_CLASS (gimp_object_class)->destroy)
    (* GTK_OBJECT_CLASS (gimp_object_class)->destroy) (object);
239 240 241 242 243 244 245
}

static void
gimp_brush_pipe_class_init (GimpBrushPipeClass *klass)
{
  GtkObjectClass *object_class;
  
246 247 248 249
  object_class = GTK_OBJECT_CLASS (klass);

  gimp_object_class = gtk_type_class (GIMP_TYPE_OBJECT);
  object_class->destroy =  gimp_brush_pipe_destroy;
250 251 252
}

void
253
gimp_brush_pipe_init (GimpBrushPipe *pipe)
254
{
255 256 257 258 259
  pipe->dimension = 0;
  pipe->rank = NULL;
  pipe->nbrushes = 0;
  pipe->select = NULL;
  pipe->index = NULL;
260 261
}

262 263
GtkType
gimp_brush_pipe_get_type (void)
264 265
{
  static GtkType type=0;
266
  if (!type){
267 268
    GtkTypeInfo info={
      "GimpBrushPipe",
269 270 271 272 273 274
      sizeof (GimpBrushPipe),
      sizeof (GimpBrushPipeClass),
      (GtkClassInitFunc) gimp_brush_pipe_class_init,
      (GtkObjectInitFunc) gimp_brush_pipe_init,
     /* reserved_1 */ NULL,
     /* reserved_2 */ NULL,
275
    (GtkClassInitFunc) NULL};
276
    type = gtk_type_unique (GIMP_TYPE_BRUSH_PIXMAP, &info);
277 278 279 280
  }
  return type;
}

281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365
static void
init_pipe_parameters ()
{
  int i;

  gihparms.step = 100;
  gihparms.ncells = 1;
  gihparms.dim = 1;
  gihparms.cols = 1;
  gihparms.rows = 1;
  gihparms.placement = "constant";
  for (i = 0; i < MAXDIM; i++)
    gihparms.selection[i] = "random";
  gihparms.rank[0] = 1;
  for (i = 1; i < MAXDIM; i++)
    gihparms.rank[i] = 0;
}

static void
parse_brush_pipe_parameters (gchar *parameters)
{
  guchar *p, *q, *r, *s;	/* Don't you love single-char identifiers?  */
  gint i;

  q = parameters;
  while ((p = strtok (q, " \r\n")) != NULL)
    {
      q = NULL;
      r = strchr (p, ':');
      if (r)
	*r = 0;

      if (strcmp (p, "ncells") == 0)
	{
	  if (r)
	    gihparms.ncells = atoi (r + 1);
	}
      else if (strcmp (p, "step") == 0)
	{
	  if (r)
	    gihparms.step = atoi (r + 1);
	}
      else if (strcmp (p, "dim") == 0)
	{
	  if (r)
	    gihparms.dim = atoi (r + 1);
	}
      else if (strcmp (p, "cols") == 0)
	{
	  if (r)
	    gihparms.cols = atoi (r + 1);
	}
      else if (strcmp (p, "rows") == 0)
	{
	  if (r)
	    gihparms.rows = atoi (r + 1);
	}
      else if (strcmp (p, "placement") == 0)
	{
	  if (r)
	    gihparms.placement = g_strdup (r + 1);
	}
      else if (strncmp (p, "rank", strlen ("rank")) == 0)
	{
	  if (r)
	    {
	      i = atoi (p + strlen ("rank"));
	      if (i >= 0 && i < gihparms.dim)
		gihparms.rank[i] = atoi (r + 1);
	    }
	}
      else if (strncmp (p, "sel", strlen ("sel")) == 0)
	{
	  if (r)
	    {
	      i = atoi (p + strlen ("sel"));
	      if (i >= 0 && i < gihparms.dim)
		gihparms.selection[i] = g_strdup (r + 1);
	    }
	}
      if (r)
	*r = ':';
    }
}

366
GimpBrushPipe *
367
gimp_brush_pipe_load (char *filename)
368 369 370 371
{
  GimpBrushPipe *pipe;
  GPatternP pattern;
  FILE *fp;
372 373
  guchar buf[1024];
  guchar *name;
374
  int i;
375
  int num_of_brushes;
376 377
  int totalcells;
  gchar *params;
378

379 380
  if ((fp = fopen (filename, "rb")) == NULL)
    return NULL;
381

382 383 384 385 386 387 388 389 390
  /* The file format starts with a painfully simple text header
   * and we use a painfully simple way to read it
   */
  if (fgets (buf, 1024, fp) == NULL)
    {
      fclose (fp);
      return NULL;
    }
  buf[strlen (buf) - 1] = 0;
391

392 393
  pipe = GIMP_BRUSH_PIPE (gimp_type_new (GIMP_TYPE_BRUSH_PIPE));
  name = g_strdup (buf);
394 395

  /* get the number of brushes */
396 397 398 399 400 401 402 403 404 405 406 407 408 409
  if (fgets (buf, 1024, fp) == NULL)
    {
      fclose (fp);
      gimp_object_destroy (pipe);
      return NULL;
    }
  num_of_brushes = strtol(buf, &params, 10);
  if (num_of_brushes < 1)
    {
      g_message (_("pixmap brush pipe should have at least one brush"));
      fclose (fp);
      gimp_object_destroy (pipe);
      return NULL;
    }
410

411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466
  while (*params && isspace(*params))
    params++;

  if (*params)
    {
      init_pipe_parameters ();
      parse_brush_pipe_parameters (params);
      pipe->dimension = gihparms.dim;
      pipe->rank = g_new (int, pipe->dimension);
      pipe->select = g_new (PipeSelectModes, pipe->dimension);
      pipe->index = g_new (int, pipe->dimension);
      for (i = 0; i < pipe->dimension; i++)
	{
	  pipe->rank[i] = gihparms.rank[i];
	  if (strcmp (gihparms.selection[i], "incremental") == 0)
	    pipe->select[i] = PIPE_SELECT_INCREMENTAL;
	  else if (strcmp (gihparms.selection[i], "angular") == 0)
	    pipe->select[i] = PIPE_SELECT_ANGULAR;
	  else if (strcmp (gihparms.selection[i], "velocity") == 0)
	    pipe->select[i] = PIPE_SELECT_VELOCITY;
	  else if (strcmp (gihparms.selection[i], "random") == 0)
	    pipe->select[i] = PIPE_SELECT_RANDOM;
	  else if (strcmp (gihparms.selection[i], "pressure") == 0)
	    pipe->select[i] = PIPE_SELECT_PRESSURE;
	  else if (strcmp (gihparms.selection[i], "xtilt") == 0)
	    pipe->select[i] = PIPE_SELECT_TILT_X;
	  else if (strcmp (gihparms.selection[i], "ytilt") == 0)
	    pipe->select[i] = PIPE_SELECT_TILT_Y;
	  else
	    pipe->select[i] = PIPE_SELECT_CONSTANT;
	  pipe->index[i] = 0;
	}
    }
  else
    {
      pipe->dimension = 1;
      pipe->rank = g_new (int, 1);
      pipe->rank[0] = num_of_brushes;
      pipe->select = g_new (PipeSelectModes, 1);
      pipe->select[0] = PIPE_SELECT_INCREMENTAL;
      pipe->index = g_new (int, 1);
      pipe->index[0] = 0;
    }

  totalcells = 1;		/* Not all necessarily present, maybe */
  for (i = 0; i < pipe->dimension; i++)
    totalcells *= pipe->rank[i];
  pipe->stride = g_new (int, pipe->dimension);
  for (i = 0; i < pipe->dimension; i++)
    {
      if (i == 0)
	pipe->stride[i] = totalcells / pipe->rank[i];
      else
	pipe->stride[i] = pipe->stride[i-1] / pipe->rank[i];
    }
  g_assert (pipe->stride[pipe->dimension-1] == 1);
467

468 469 470 471
  pattern = (GPatternP) g_malloc (sizeof (GPattern));
  pattern->filename = NULL;
  pattern->name = NULL;
  pattern->mask = NULL;
472

473 474
  pipe->brushes =
    (GimpBrushPixmap **) g_new0 (GimpBrushPixmap *, num_of_brushes);
475

476 477
  /* First pixmap brush in the list is the pipe itself */
  pipe->brushes[0] = GIMP_BRUSH_PIXMAP (pipe);
478

479 480 481 482 483 484
  /* Current pixmap brush is the first one. */
  pipe->current = pipe->brushes[0];

  while (pipe->nbrushes < num_of_brushes)
    {
      if (pipe->nbrushes > 0)
485
	{
486 487 488
	  pipe->brushes[pipe->nbrushes] =
	    GIMP_BRUSH_PIXMAP (gimp_type_new (GIMP_TYPE_BRUSH_PIXMAP));
	  GIMP_BRUSH (pipe->brushes[pipe->nbrushes])->name = NULL;
489
	}
490 491
      
      pipe->brushes[pipe->nbrushes]->pipe = pipe;
492

493 494 495 496
      /* load the brush */
      if (!gimp_brush_load_brush (GIMP_BRUSH (pipe->brushes[pipe->nbrushes]),
				  fp, filename)
	  || !load_pattern_pattern (pattern, fp, filename))
497
       {
498 499 500 501
	  g_message (_("failed to load one of the pixmap brushes in the pipe"));
	  fclose (fp);
	  g_free (pattern);
	  gimp_object_destroy (pipe);
502 503
	  return NULL;
       }
504 505 506 507 508 509 510 511 512

      if (pipe->nbrushes == 0)
	{
	  /* Replace name with the whole pipe's name */
	  GIMP_BRUSH (pipe)->name = name;
	}
      pipe->brushes[pipe->nbrushes]->pixmap_mask = pattern->mask;

      pipe->nbrushes++;
513
    }
514 515

  /*  Clean up  */
516 517
  fclose (fp);

518 519 520 521 522 523 524 525 526 527 528 529 530 531 532
  g_free(pattern);
  return pipe;
}

GimpBrushPipe *
gimp_brush_pixmap_load (char *filename)
{
  GimpBrushPipe *pipe;
  GPatternP pattern;
  FILE *fp;

  if ((fp = fopen (filename, "rb")) == NULL)
    return NULL;

  pipe = GIMP_BRUSH_PIPE (gimp_type_new (GIMP_TYPE_BRUSH_PIPE));
533

534 535 536 537 538 539 540 541
  /* A (single) pixmap brush is a pixmap pipe brush with just one pixmap */
  pipe->dimension = 1;
  pipe->rank = g_new (int, 1);
  pipe->rank[0] = 1;
  pipe->select = g_new (PipeSelectModes, 1);
  pipe->select[0] = PIPE_SELECT_INCREMENTAL;
  pipe->index = g_new (int, 1);
  pipe->index[0] = 0;
542

543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573
  pattern = (GPatternP) g_malloc (sizeof (GPattern));
  pattern->filename = NULL;
  pattern->name = NULL;
  pattern->mask = NULL;

  pipe->brushes = (GimpBrushPixmap **) g_new (GimpBrushPixmap *, 1);

  pipe->brushes[0] = GIMP_BRUSH_PIXMAP (pipe);
  pipe->current = pipe->brushes[0];

  pipe->brushes[0]->pipe = pipe;

  /* load the brush */
  if (!gimp_brush_load_brush (GIMP_BRUSH (pipe->brushes[0]),
			      fp, filename)
      || !load_pattern_pattern (pattern, fp, filename))
    {
      g_message (_("failed to load pixmap brush"));
      fclose (fp);
      g_free (pattern);
      gimp_object_destroy (pipe);
      return NULL;
    }
  
  pipe->brushes[0]->pixmap_mask = pattern->mask;

  pipe->nbrushes = 1;
  /*  Clean up  */
  fclose (fp);

  g_free(pattern);
574
  return pipe;
575 576 577 578 579 580 581 582 583 584 585 586 587 588 589
}

TempBuf *
gimp_brush_pixmap_pixmap (GimpBrushPixmap *brush)
{
  g_return_val_if_fail (brush != NULL, NULL);
  g_return_val_if_fail (GIMP_IS_BRUSH_PIXMAP (brush), NULL);

  return brush->pixmap_mask;
}

void
color_area_with_pixmap (PaintCore *paint_core,
			GImage *dest,
			GimpDrawable *drawable,
590 591
			TempBuf *area,
			int mode)
592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611
{

  PixelRegion destPR;
  void *pr;
  guchar *d;
  int ulx, uly, offsetx, offsety, y;
  GimpBrushPixmap *pixmap;
  
  g_return_if_fail (GIMP_IS_BRUSH_PIXMAP (paint_core->brush));

  pixmap = GIMP_BRUSH_PIXMAP (paint_core->brush);

  destPR.bytes = area->bytes;
  destPR.x = 0; destPR.y = 0;
  destPR.w = area->width;
  destPR.h = area->height;
  destPR.rowstride = destPR.bytes * area->width;
  destPR.data = temp_buf_data (area);
		
  pr = pixel_regions_register (1, &destPR);
612

613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629
  /* Calculate upper left corner of brush as in
   * paint_core_get_paint_area.  Ugly to have to do this here, too.
   */

  ulx = (int) paint_core->curx - (paint_core->brush->mask->width >> 1);
  uly = (int) paint_core->cury - (paint_core->brush->mask->height >> 1);

  offsetx = area->x - ulx;
  offsety = area->y - uly;

  for (; pr != NULL; pr = pixel_regions_process (pr))
    {
      d = destPR.data;
      for (y = 0; y < destPR.h; y++)
	{
	  paint_line_pixmap_mask (dest, drawable, pixmap,
				  d, offsetx, y + offsety,
630
				  destPR.bytes, destPR.w, mode);
631 632 633 634 635 636 637 638 639 640 641 642 643
	  d += destPR.rowstride;
	}
    }
}

static void
paint_line_pixmap_mask (GImage          *dest,
			GimpDrawable    *drawable,
			GimpBrushPixmap *brush,
			guchar	        *d,
			int		 x,
			int              y,
			int              bytes,
644 645
			int              width,
			int              mode)
646 647
{
  guchar *b, *p;
648 649 650 651 652 653
  int x_index;
  gdouble alpha;
  gdouble factor = 0.00392156986;  /* 1.0/255.0 */
  gint i;
  gint j;
  guchar *mask;
654 655 656 657 658 659 660 661 662 663 664

  /*  Make sure x, y are positive  */
  while (x < 0)
    x += brush->pixmap_mask->width;
  while (y < 0)
    y += brush->pixmap_mask->height;

  /* Point to the approriate scanline */
  b = temp_buf_data (brush->pixmap_mask) +
    (y % brush->pixmap_mask->height) * brush->pixmap_mask->width * brush->pixmap_mask->bytes;
    
665 666 667
  /* ditto, except for the brush mask, so we can pre-multiply the alpha value */
  mask = temp_buf_data((brush->gbrush).mask) +
    (y % brush->pixmap_mask->height) * brush->pixmap_mask->width;
668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692

  if(mode == SOFT)
    {
      for (i = 0; i < width; i++)
	{
	  /* attempt to avoid doing this calc twice in the loop */
	  x_index = ((i + x) % brush->pixmap_mask->width);
	  p = b + x_index * brush->pixmap_mask->bytes;
	  d[bytes-1] = mask[x_index];

	  /* multiply alpha into the pixmap data */
	  /* maybe we could do this at tool creation or brush switch time? */
	  /* and compute it for the whole brush at once and cache it?  */
	  if(alpha = d[bytes-1] * factor)
	    {
	      d[0] *= alpha;
	      d[1] *= alpha;
	      d[2] *= alpha;
	    }
	  /* printf("i: %i d->r: %i d->g: %i d->b: %i d->a: %i\n",i,(int)d[0], (int)d[1], (int)d[2], (int)d[3]); */
	  gimage_transform_color (dest, drawable, p, d, RGB);
	  d += bytes;
	}
    }
  else
693
    {
694 695 696 697 698 699 700 701 702 703 704 705 706
      for (i = 0; i < width; i++)
	{
	  /* attempt to avoid doing this calc twice in the loop */
	  x_index = ((i + x) % brush->pixmap_mask->width);
	  p = b + x_index * brush->pixmap_mask->bytes;
	  d[bytes-1] = 255;

	  /* multiply alpha into the pixmap data */
	  /* maybe we could do this at tool creation or brush switch time? */
	  /* and compute it for the whole brush at once and cache it?  */
	  gimage_transform_color (dest, drawable, p, d, RGB);
	  d += bytes;
	}
707
    }
708
}
709