gimpbrushpipe.c 12.4 KB
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/* 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.
 */

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#include "config.h"

#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include "apptypes.h"
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#include "appenv.h"
#include "brush_header.h"
#include "pattern_header.h"
#include "patterns.h"
#include "gimpbrush.h"
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#include "gimpbrushpipe.h"
#include "gimpbrushpipeP.h"
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#include "paint_core.h"
#include "gimprc.h"
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#include "libgimp/gimpmath.h"
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#include "libgimp/parasiteio.h"
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#include "libgimp/gimpintl.h"

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static GimpBrushClass       *gimp_brush_class;
static GimpBrushPixmapClass *gimp_brush_pixmap_class;
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static GimpBrush *gimp_brush_pixmap_select_brush     (PaintCore *paint_core);
static gboolean   gimp_brush_pixmap_want_null_motion (PaintCore *paint_core);
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static void
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gimp_brush_pixmap_destroy (GtkObject *object)
{
  GimpBrushPixmap *pixmap;

  g_return_if_fail (GIMP_IS_BRUSH_PIXMAP (object));

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

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  if (GTK_OBJECT_CLASS (gimp_brush_class)->destroy)
    (* GTK_OBJECT_CLASS (gimp_brush_class)->destroy) (object);
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}

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 ());

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  object_class->destroy         = gimp_brush_pixmap_destroy;
  brush_class->select_brush     = gimp_brush_pixmap_select_brush;
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  brush_class->want_null_motion = gimp_brush_pixmap_want_null_motion;
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}

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

GtkType
gimp_brush_pixmap_get_type (void)
{
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  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);
    }

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  return type;
}
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static GimpBrush *
gimp_brush_pixmap_select_brush (PaintCore *paint_core)
{
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  GimpBrushPipe *pipe;
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  int i, brushix, ix;
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  double angle;
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  g_return_val_if_fail (GIMP_IS_BRUSH_PIXMAP (paint_core->brush), NULL);

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  pipe = GIMP_BRUSH_PIXMAP (paint_core->brush)->pipe;
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  if (pipe->nbrushes == 1)
    return GIMP_BRUSH (pipe->current);
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  brushix = 0;
  for (i = 0; i < pipe->dimension; i++)
    {
      switch (pipe->select[i])
	{
	case PIPE_SELECT_INCREMENTAL:
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	  ix = (pipe->index[i] + 1) % pipe->rank[i];
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	  break;
	case PIPE_SELECT_ANGULAR:
	  angle = atan2 (paint_core->cury - paint_core->lasty,
			 paint_core->curx - paint_core->lastx);
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	  /* Offset angle to be compatible with PSP tubes */
	  angle += G_PI_2;
	  /* Map it to the [0..2*G_PI) interval */
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	  if (angle < 0)
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	    angle += 2.0 * G_PI;
	  else if (angle > 2.0 * G_PI)
	    angle -= 2.0 * G_PI;
	  ix = RINT (angle / (2.0 * G_PI) * pipe->rank[i]);
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	  break;
	case PIPE_SELECT_RANDOM:
	  /* This probably isn't the right way */
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	  ix = rand () % pipe->rank[i];
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	  break;
	case PIPE_SELECT_PRESSURE:
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	  ix = RINT (paint_core->curpressure * (pipe->rank[i] - 1));
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	  break;
	case PIPE_SELECT_TILT_X:
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	  ix = RINT (paint_core->curxtilt / 2.0 * pipe->rank[i]) + pipe->rank[i]/2;
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	  break;
	case PIPE_SELECT_TILT_Y:
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	  ix = RINT (paint_core->curytilt / 2.0 * pipe->rank[i]) + pipe->rank[i]/2;
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	  break;
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	case PIPE_SELECT_CONSTANT:
	default:
	  ix = pipe->index[i];
	  break;
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	}
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      pipe->index[i] = CLAMP (ix, 0, pipe->rank[i]-1);
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      brushix += pipe->stride[i] * pipe->index[i];
      /* g_print ("ix at %d: %d, brushix: %d\n", i, ix, brushix); */
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    }

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  /* Make sure is inside bounds */
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  brushix = CLAMP (brushix, 0, pipe->nbrushes-1);
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  pipe->current = pipe->brushes[brushix];

  return GIMP_BRUSH (pipe->current);
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}
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static gboolean
gimp_brush_pixmap_want_null_motion (PaintCore *paint_core)
{
  GimpBrushPipe *pipe;
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  gint i;
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  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;
}

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static void
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gimp_brush_pipe_destroy (GtkObject *object)
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{
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  GimpBrushPipe *pipe;
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  gint i;
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  g_return_if_fail (object != NULL);
  g_return_if_fail (GIMP_IS_BRUSH_PIPE (object));

  pipe = GIMP_BRUSH_PIPE (object);

  g_free (pipe->rank);
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  g_free (pipe->stride);
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  for (i = 1; i < pipe->nbrushes; i++)
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    gtk_object_unref (GTK_OBJECT (pipe->brushes[i]));
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  g_free (pipe->brushes);
  g_free (pipe->select);
  g_free (pipe->index);

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  if (GTK_OBJECT_CLASS (gimp_brush_pixmap_class)->destroy)
    (* GTK_OBJECT_CLASS (gimp_brush_pixmap_class)->destroy) (object);
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}

static void
gimp_brush_pipe_class_init (GimpBrushPipeClass *klass)
{
  GtkObjectClass *object_class;
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  object_class = GTK_OBJECT_CLASS (klass);

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  gimp_brush_pixmap_class = gtk_type_class (GIMP_TYPE_BRUSH_PIXMAP);
  object_class->destroy = gimp_brush_pipe_destroy;
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}

void
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gimp_brush_pipe_init (GimpBrushPipe *pipe)
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{
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  pipe->dimension = 0;
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  pipe->rank      = NULL;
  pipe->nbrushes  = 0;
  pipe->select    = NULL;
  pipe->index     = NULL;
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}

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GtkType
gimp_brush_pipe_get_type (void)
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{
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  static GtkType type = 0;

  if (!type)
    {
      GtkTypeInfo info =
      {
	"GimpBrushPipe",
	sizeof (GimpBrushPipe),
	sizeof (GimpBrushPipeClass),
	(GtkClassInitFunc) gimp_brush_pipe_class_init,
	(GtkObjectInitFunc) gimp_brush_pipe_init,
	/* reserved_1 */ NULL,
	/* reserved_2 */ NULL,
	(GtkClassInitFunc) NULL
      };

      type = gtk_type_unique (GIMP_TYPE_BRUSH_PIXMAP, &info);
    }

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  return type;
}

GimpBrushPipe *
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gimp_brush_pipe_load (gchar *filename)
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{
  GimpBrushPipe *pipe;
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  GPattern      *pattern;
  PixPipeParams  params;
  FILE  *fp;
  gchar  buf[1024];
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  gchar *name;
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  gint   i;
  gint   num_of_brushes;
  gint   totalcells;
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  gchar *paramstring;
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  if ((fp = fopen (filename, "rb")) == NULL)
    return NULL;
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  /* 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;
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  pipe = GIMP_BRUSH_PIPE (gimp_type_new (GIMP_TYPE_BRUSH_PIPE));
  name = g_strdup (buf);
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  /* get the number of brushes */
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  if (fgets (buf, 1024, fp) == NULL)
    {
      fclose (fp);
      gimp_object_destroy (pipe);
      return NULL;
    }
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  num_of_brushes = strtol (buf, &paramstring, 10);
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  if (num_of_brushes < 1)
    {
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      g_message (_("Brush pipes should have at least one brush."));
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      fclose (fp);
      gimp_object_destroy (pipe);
      return NULL;
    }
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  while (*paramstring && isspace (*paramstring))
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    paramstring++;
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  if (*paramstring)
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    {
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      pixpipeparams_init (&params);
      pixpipeparams_parse (paramstring, &params);
      pipe->dimension = params.dim;
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      pipe->rank      = g_new (gint, pipe->dimension);
      pipe->select    = g_new (PipeSelectModes, pipe->dimension);
      pipe->index     = g_new (gint, pipe->dimension);
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      /* placement is not used at all ?? */
      if (params.free_placement_string)
	g_free (params.placement);
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      for (i = 0; i < pipe->dimension; i++)
	{
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	  pipe->rank[i] = params.rank[i];
	  if (strcmp (params.selection[i], "incremental") == 0)
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	    pipe->select[i] = PIPE_SELECT_INCREMENTAL;
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	  else if (strcmp (params.selection[i], "angular") == 0)
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	    pipe->select[i] = PIPE_SELECT_ANGULAR;
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	  else if (strcmp (params.selection[i], "velocity") == 0)
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	    pipe->select[i] = PIPE_SELECT_VELOCITY;
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	  else if (strcmp (params.selection[i], "random") == 0)
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	    pipe->select[i] = PIPE_SELECT_RANDOM;
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	  else if (strcmp (params.selection[i], "pressure") == 0)
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	    pipe->select[i] = PIPE_SELECT_PRESSURE;
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	  else if (strcmp (params.selection[i], "xtilt") == 0)
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	    pipe->select[i] = PIPE_SELECT_TILT_X;
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	  else if (strcmp (params.selection[i], "ytilt") == 0)
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	    pipe->select[i] = PIPE_SELECT_TILT_Y;
	  else
	    pipe->select[i] = PIPE_SELECT_CONSTANT;
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	  if (params.free_selection_string)
	    g_free (params.selection[i]);
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	  pipe->index[i] = 0;
	}
    }
  else
    {
      pipe->dimension = 1;
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      pipe->rank      = g_new (gint, 1);
      pipe->rank[0]   = num_of_brushes;
      pipe->select    = g_new (PipeSelectModes, 1);
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      pipe->select[0] = PIPE_SELECT_INCREMENTAL;
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      pipe->index     = g_new (gint, 1);
      pipe->index[0]  = 0;
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    }

  totalcells = 1;		/* Not all necessarily present, maybe */
  for (i = 0; i < pipe->dimension; i++)
    totalcells *= pipe->rank[i];
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  pipe->stride = g_new (gint, pipe->dimension);
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  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);
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  pattern = g_new0 (GPattern, 1);
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  pipe->brushes = g_new0 (GimpBrushPixmap *, num_of_brushes);
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  /* First pixmap brush in the list is the pipe itself */
  pipe->brushes[0] = GIMP_BRUSH_PIXMAP (pipe);
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  /* Current pixmap brush is the first one. */
  pipe->current = pipe->brushes[0];

  while (pipe->nbrushes < num_of_brushes)
    {
      if (pipe->nbrushes > 0)
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	{
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	  pipe->brushes[pipe->nbrushes] =
	    GIMP_BRUSH_PIXMAP (gimp_type_new (GIMP_TYPE_BRUSH_PIXMAP));
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	  g_free (GIMP_BRUSH (pipe->brushes[pipe->nbrushes])->name);
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	  GIMP_BRUSH (pipe->brushes[pipe->nbrushes])->name = NULL;
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	}
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      pipe->brushes[pipe->nbrushes]->pipe = pipe;
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      /* load the brush */
      if (!gimp_brush_load_brush (GIMP_BRUSH (pipe->brushes[pipe->nbrushes]),
				  fp, filename)
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	  || !pattern_load (pattern, fp, filename))
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       {
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	  g_message (_("Failed to load one of the\n"
                       "brushes in the brush pipe."));
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	  fclose (fp);
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	  pattern_free (pattern);
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	  gimp_object_destroy (pipe);
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	  return NULL;
       }
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      if (pipe->nbrushes == 0)
	{
	  /* Replace name with the whole pipe's name */
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	  g_free (GIMP_BRUSH (pipe)->name);
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	  GIMP_BRUSH (pipe)->name = name;
	}
      pipe->brushes[pipe->nbrushes]->pixmap_mask = pattern->mask;
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      g_free (pattern->name);
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      pipe->nbrushes++;
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    }
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  /*  Clean up  */
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  fclose (fp);

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  g_free (pattern);
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  return pipe;
}

GimpBrushPipe *
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gimp_brush_pixmap_load (gchar *filename)
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{
  GimpBrushPipe *pipe;
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  GPattern *pattern;
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  FILE *fp;

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

  pipe = GIMP_BRUSH_PIPE (gimp_type_new (GIMP_TYPE_BRUSH_PIPE));
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  /* A (single) pixmap brush is a pixmap pipe brush with just one pixmap */
  pipe->dimension = 1;
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  pipe->rank      = g_new (gint, 1);
  pipe->rank[0]   = 1;
  pipe->select    = g_new (PipeSelectModes, 1);
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  pipe->select[0] = PIPE_SELECT_INCREMENTAL;
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  pipe->index     = g_new (gint, 1);
  pipe->index[0]  = 0;
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  pattern = g_new0 (GPattern, 1);
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  pipe->brushes = g_new (GimpBrushPixmap *, 1);
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  pipe->brushes[0] = GIMP_BRUSH_PIXMAP (pipe);
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  pipe->current    = pipe->brushes[0];
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  pipe->brushes[0]->pipe = pipe;

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

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

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  g_free (pattern->name);
  g_free (pattern);
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  return pipe;
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}

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;
}