gimpink.c 30.7 KB
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/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * 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.
 */
#include "appenv.h"
#include "drawable.h"
#include "draw_core.h"
#include "gimage_mask.h"
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#include "gimpbrushlist.h"
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#include "gimprc.h"
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#include "ink.h"
#include "tools.h"
#include "undo.h"
#include "blob.h"
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#include "gdisplay.h"
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#include "libgimp/gimpintl.h"

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#include "tile.h"			/* ick. */
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#include <math.h>
#include <stdlib.h>
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#include <string.h>
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#ifndef M_PI
#define M_PI    3.14159265358979323846
#endif /* M_PI */

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#define SUBSAMPLE 8

/*  the Ink structures  */

typedef struct _InkTool InkTool;
struct _InkTool
{
  DrawCore *      core;         /*  Core select object          */
  
  Blob     *      last_blob;	/*  blob for last cursor position */

  int             x1, y1;       /*  image space coordinate      */
  int             x2, y2;       /*  image space coords          */

};

typedef struct _InkOptions InkOptions;
struct _InkOptions
{
  double       size;
  double       aspect;
  double       angle;
  double       sensitivity;
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  double       tilt_sensitivity;
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  double       tilt_angle;
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};

typedef struct _BrushWidget BrushWidget;
struct _BrushWidget
{
  gboolean     state;
};

/*  undo blocks variables  */
static TileManager *  undo_tiles = NULL;
static TileManager *  canvas_tiles = NULL;

/*  paint buffer */
static TempBuf *  canvas_buf = NULL;

/*  local variables  */
static InkOptions *ink_options = NULL;

/*  local function prototypes  */
static void   ink_button_press            (Tool *, GdkEventButton *, gpointer);
static void   ink_button_release          (Tool *, GdkEventButton *, gpointer);
static void   ink_motion                  (Tool *, GdkEventMotion *, gpointer);
static void   ink_cursor_update           (Tool *, GdkEventMotion *, gpointer);
static void   ink_control                 (Tool *, int, gpointer);

static InkOptions *create_ink_options   (void);
static Argument *ink_invoker              (Argument *);

static void ink_init   (InkTool      *ink_tool, 
			GimpDrawable *drawable, 
			double        x, 
			double        y);
static void ink_finish (InkTool      *ink_tool, 
			GimpDrawable *drawable, 
			int           tool_id);
static void ink_cleanup (void);

static void ink_scale_update              (GtkAdjustment  *adjustment, 
                                           gdouble        *value);
/* Rendering functions */

static void ink_set_paint_area  (InkTool      *ink_tool, 
				 GimpDrawable *drawable, 
				 Blob         *blob);
static void ink_paste           (InkTool      *ink_tool, 
				 GimpDrawable *drawable,
				 Blob         *blob);

static void ink_to_canvas_tiles (InkTool      *ink_tool,
				 Blob         *blob,
				 guchar       *color);

static void ink_set_undo_tiles  (GimpDrawable *drawable,
				 int           x, 
				 int           y,
				 int           w, 
				 int           h);
static void ink_set_canvas_tiles(int           x, 
				 int           y,
				 int           w, 
				 int           h);

/* Brush pseudo-widget callbacks */
static void brush_widget_active_rect      (BrushWidget    *brush_widget,
					   GtkWidget      *w, 
					   GdkRectangle   *rect);
static void brush_widget_realize          (GtkWidget      *w);
static void brush_widget_expose           (GtkWidget      *w, 
					   GdkEventExpose *event,
					   BrushWidget    *brush_widget);
static void brush_widget_button_press     (GtkWidget      *w, 
					   GdkEventButton *event,
					   BrushWidget    *brush_widget);
static void brush_widget_button_release   (GtkWidget      *w,  
					   GdkEventButton *event,
					   BrushWidget    *brush_widget);
static void brush_widget_motion_notify    (GtkWidget      *w, 
					   GdkEventMotion *event,
					   BrushWidget    *brush_widget);


static InkOptions *
create_ink_options ()
{
  GtkWidget *vbox;
  GtkWidget *hbox;
  GtkWidget *label;
  GtkWidget *slider;
  GtkWidget *aspect_frame;
  GtkWidget *darea;
  GtkAdjustment *adj;

  BrushWidget *brush_widget;
  InkOptions *options;

  /*  the new options structure  */
  options = (InkOptions *) g_malloc (sizeof (InkOptions));

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  options->size = 3.0;
  options->sensitivity = 1.0;
  options->aspect = 1.0;
  options->angle = 0.0;
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  options->tilt_sensitivity = 1.0;
  options->tilt_angle = 0.0;
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  /*  the main vbox  */
  vbox = gtk_vbox_new (FALSE, 1);

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  /*  the main label  */
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  label = gtk_label_new (_("Ink Options"));
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  gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
  gtk_widget_show (label);

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  /* size slider */
  hbox = gtk_hbox_new (FALSE, 2);
  gtk_box_pack_start (GTK_BOX(vbox), hbox, FALSE, FALSE, 0);
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  label = gtk_label_new (_("Size:"));
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  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 2);
  
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  adj = GTK_ADJUSTMENT (gtk_adjustment_new (3.0, 0.0, 20.0, 1.0, 5.0, 0.0));
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  slider = gtk_hscale_new (adj);
  gtk_box_pack_start (GTK_BOX (hbox), slider, TRUE, TRUE, 0);
  gtk_scale_set_value_pos (GTK_SCALE (slider), GTK_POS_TOP);
  
  gtk_range_set_update_policy (GTK_RANGE (slider), GTK_UPDATE_DELAYED);
  gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
		      (GtkSignalFunc) ink_scale_update,
		      &options->size);
  
  /* sens slider */
  hbox = gtk_hbox_new (FALSE, 2);
  gtk_box_pack_start (GTK_BOX(vbox), hbox, FALSE, FALSE, 0);
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  label = gtk_label_new (_("Sensitivity:"));
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  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 2);
  
  adj = GTK_ADJUSTMENT (gtk_adjustment_new (1.0, 0.0, 1.0, 0.01, 0.1, 0.0));
  slider = gtk_hscale_new (adj);
  gtk_box_pack_start (GTK_BOX (hbox), slider, TRUE, TRUE, 0);
  gtk_scale_set_value_pos (GTK_SCALE (slider), GTK_POS_TOP);
  
  gtk_range_set_update_policy (GTK_RANGE (slider), GTK_UPDATE_DELAYED);
  gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
		      (GtkSignalFunc) ink_scale_update,
		      &options->sensitivity);

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  /* tilt sens slider */
  hbox = gtk_hbox_new (FALSE, 2);
  gtk_box_pack_start (GTK_BOX(vbox), hbox, FALSE, FALSE, 0);
  label = gtk_label_new (_("Tilt Sensitivity:"));
  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 2);
  
  adj = GTK_ADJUSTMENT (gtk_adjustment_new (1.0, 0.0, 1.0, 0.01, 0.1, 0.0));
  slider = gtk_hscale_new (adj);
  gtk_box_pack_start (GTK_BOX (hbox), slider, TRUE, TRUE, 0);
  gtk_scale_set_value_pos (GTK_SCALE (slider), GTK_POS_TOP);
  
  gtk_range_set_update_policy (GTK_RANGE (slider), GTK_UPDATE_DELAYED);
  gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
		      (GtkSignalFunc) ink_scale_update,
		      &options->tilt_sensitivity);

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  /* angle adjust slider */
  hbox = gtk_hbox_new (FALSE, 2);
  gtk_box_pack_start (GTK_BOX(vbox), hbox, FALSE, FALSE, 0);
  label = gtk_label_new (_("Angle adjust:"));
  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 2);
  
  adj = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, -90.0, 90.0, 1, 10.0, 0.0));
  slider = gtk_hscale_new (adj);
  gtk_box_pack_start (GTK_BOX (hbox), slider, TRUE, TRUE, 0);
  gtk_scale_set_value_pos (GTK_SCALE (slider), GTK_POS_TOP);
  
  gtk_range_set_update_policy (GTK_RANGE (slider), GTK_UPDATE_DELAYED);
  gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
		      (GtkSignalFunc) ink_scale_update,
		      &options->tilt_angle);

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  /* Brush shape widget */

  brush_widget = g_new (BrushWidget, 1);
  brush_widget->state = FALSE;
  
  hbox = gtk_hbox_new (FALSE, 2);
  gtk_box_pack_start (GTK_BOX(vbox), hbox, FALSE, FALSE, 5);
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  label = gtk_label_new (_("Shape:"));
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  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
  
  aspect_frame = gtk_aspect_frame_new (NULL, 0.5, 0.5, 1.0, FALSE);
  gtk_frame_set_shadow_type (GTK_FRAME(aspect_frame), GTK_SHADOW_IN);
  gtk_box_pack_start (GTK_BOX (hbox), aspect_frame, TRUE, TRUE, 2);
  
  darea = gtk_drawing_area_new();
  gtk_drawing_area_size (GTK_DRAWING_AREA(darea), 60, 60);
  gtk_container_add (GTK_CONTAINER(aspect_frame), darea);
  
  gtk_widget_set_events (darea, 
			 GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK
			 | GDK_POINTER_MOTION_MASK | GDK_EXPOSURE_MASK);
  gtk_signal_connect (GTK_OBJECT (darea), "button_press_event",
		      GTK_SIGNAL_FUNC (brush_widget_button_press),
		      brush_widget);
  gtk_signal_connect (GTK_OBJECT (darea), "button_release_event",
		      GTK_SIGNAL_FUNC (brush_widget_button_release),
		      brush_widget);
  gtk_signal_connect (GTK_OBJECT (darea), "motion_notify_event",
		      GTK_SIGNAL_FUNC (brush_widget_motion_notify),
		      brush_widget);
  gtk_signal_connect (GTK_OBJECT (darea), "expose_event",
		      GTK_SIGNAL_FUNC (brush_widget_expose), 
		      brush_widget);
  gtk_signal_connect (GTK_OBJECT (darea), "realize",
		      GTK_SIGNAL_FUNC (brush_widget_realize),
		      brush_widget);
  gtk_widget_show_all (vbox);
  gtk_widget_hide (vbox);
  
  /*  Register this selection options widget with the main tools options dialog  */
  tools_register_options (INK, vbox);

  return options;
}

static void
brush_widget_active_rect (BrushWidget *brush_widget, GtkWidget *w,
			  GdkRectangle *rect)
{
  int x,y;
  int r;

  r = MIN(w->allocation.width,w->allocation.height)/2;

  x = w->allocation.width/2 + 0.85*r*ink_options->aspect/10. *
    cos (ink_options->angle);
  y = w->allocation.height/2 + 0.85*r*ink_options->aspect/10. *
    sin (ink_options->angle);

  rect->x = x-5;
  rect->y = y-5;
  rect->width = 10;
  rect->height = 10;
}

static void
brush_widget_realize (GtkWidget *w)
{
  gtk_style_set_background (w->style, w->window, GTK_STATE_ACTIVE);
}

static void
brush_widget_draw_brush (BrushWidget *brush_widget, GtkWidget *w,
			 double xc, double yc, double radius)
{
  int i;
  Blob *b;

  b = blob_ellipse(xc,yc,
		   radius*cos(ink_options->angle),
		   radius*sin(ink_options->angle),
		   -(radius/ink_options->aspect)*sin(ink_options->angle),
		   (radius/ink_options->aspect)*cos(ink_options->angle));

  for (i=0;i<b->height;i++)
    {
      if (b->data[i].left <= b->data[i].right)
	gdk_draw_line (w->window,
		       w->style->fg_gc[w->state],
		       b->data[i].left,i+b->y,
		       b->data[i].right+1,i+b->y);
    }
  
  g_free (b);
}

static void
brush_widget_expose (GtkWidget *w, GdkEventExpose *event,
		     BrushWidget *brush_widget)
{
  GdkRectangle rect;
  int r0;
  
  r0 = MIN(w->allocation.width,w->allocation.height)/2;

  if (r0 < 2)
    return;

  gdk_window_clear_area(w->window,
			0,0,w->allocation.width,
			w->allocation.height);
  brush_widget_draw_brush (brush_widget, w,
			   w->allocation.width/2, w->allocation.height/2,
			   0.9*r0);

  brush_widget_active_rect (brush_widget, w, &rect);
  gdk_draw_rectangle (w->window, w->style->bg_gc[GTK_STATE_NORMAL],
		      TRUE,	/* filled */
		      rect.x, rect.y, 
		      rect.width, rect.height);
  gtk_draw_shadow (w->style, w->window, w->state, GTK_SHADOW_OUT,
		   rect.x, rect.y,
		   rect.width, rect.height);
}

static void
brush_widget_button_press (GtkWidget *w, GdkEventButton *event,
			   BrushWidget *brush_widget)
{
  GdkRectangle rect;

  brush_widget_active_rect (brush_widget, w, &rect);
  
  if ((event->x >= rect.x) && (event->x-rect.x < rect.width) &&
      (event->y >= rect.y) && (event->y-rect.y < rect.height))
    {
      brush_widget->state = TRUE;
    }
}

static void
brush_widget_button_release (GtkWidget *w, GdkEventButton *event,
			    BrushWidget *brush_widget)
{
  brush_widget->state = FALSE;
}

static void
brush_widget_motion_notify (GtkWidget *w, GdkEventMotion *event,
			    BrushWidget *brush_widget)
{
  int x;
  int y;
  int r0;
  int rsquare;

  if (brush_widget->state)
    {
      x = event->x - w->allocation.width/2;
      y = event->y - w->allocation.height/2;
      rsquare = x*x + y*y;

      if (rsquare != 0)
	{
	  ink_options->angle = atan2(y,x);

	  r0 = MIN(w->allocation.width,w->allocation.height)/2;
	  ink_options->aspect =
	    10. * sqrt((double)rsquare/(r0*r0)) / 0.85;

	  if (ink_options->aspect < 1.0)
	    ink_options->aspect = 1.0;
	  if (ink_options->aspect > 10.0)
	    ink_options->aspect = 10.0;

	  gtk_widget_draw(w, NULL);
	}
    }
}

static void
ink_scale_update (GtkAdjustment *adjustment, gdouble *value)
{
  *value = adjustment->value;
}

static Blob *
ink_pen_ellipse (gdouble x_center, gdouble y_center,
		 gdouble pressure, gdouble xtilt, gdouble ytilt)
{
  double size;
  double tsin, tcos;
  double aspect, radmin;
  double x,y;
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  double tscale;
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  double tscale_c;
  double tscale_s;
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  size = ink_options->size * (1 + ink_options->sensitivity * (2*pressure - 1));
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  if (size*SUBSAMPLE < 1) size = 1/SUBSAMPLE;
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  /* Add brush angle/aspect to title vectorially */

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  /* I'm not happy with the way the brush widget info is combined with
     tilt info from the brush. My personal feeling is that representing
     both as affine transforms would make the most sense. -RLL */

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  tscale = ink_options->tilt_sensitivity * 10.0;
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  tscale_c = tscale * cos (ink_options->tilt_angle * M_PI / 180);
  tscale_s = tscale * sin (ink_options->tilt_angle * M_PI / 180);
  x = ink_options->aspect*cos(ink_options->angle) +
    xtilt * tscale_c - ytilt * tscale_s;
  y = ink_options->aspect*sin(ink_options->angle) +
    ytilt * tscale_c + xtilt * tscale_s;
#ifdef VERBOSE
  g_print ("angle %g aspect %g; %g %g; %g %g\n",
	   ink_options->angle, ink_options->aspect, tscale_c, tscale_s, x, y);
#endif
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  aspect = sqrt(x*x+y*y);

  if (aspect != 0)
    {
      tcos = x/aspect;
      tsin = y/aspect;
    }
  else
    {
      tsin = sin(ink_options->angle);
      tcos = cos(ink_options->angle);
    }
  
  if (aspect < 1.0) 
    aspect = 1.0;
  else if (aspect > 10.0) 
    aspect = 10.0;

  radmin = SUBSAMPLE * size/aspect;
  if (radmin < 1.0) radmin = 1.0;
  
  return blob_ellipse(x_center * SUBSAMPLE, y_center * SUBSAMPLE,
		      radmin*aspect*tcos, radmin*aspect*tsin,  
		      -radmin*tsin, radmin*tcos);
}

static void
ink_button_press (Tool           *tool,
		  GdkEventButton *bevent,
		  gpointer        gdisp_ptr)
{
  gdouble       x, y;
  GDisplay     *gdisp;
  InkTool      *ink_tool;
  GimpDrawable *drawable;
  Blob         *b;

  gdisp = (GDisplay *) gdisp_ptr;
  ink_tool = (InkTool *) tool->private;

  /*  Keep the coordinates of the target  */
  gdisplay_untransform_coords_f (gdisp, bevent->x, bevent->y,
				 &x, &y, TRUE);
  drawable = gimage_active_drawable (gdisp->gimage);

  ink_init (ink_tool, drawable, x, y);

  tool->state = ACTIVE;
  tool->gdisp_ptr = gdisp_ptr;
  tool->paused_count = 0;

  /*  pause the current selection and grab the pointer  */
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  gdisplays_selection_visibility (gdisp->gimage, SelectionPause);
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  /* add motion memory if you press mod1 first ^ perfectmouse */
  if (((bevent->state & GDK_MOD1_MASK) != 0) != (perfectmouse != 0))
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    gdk_pointer_grab (gdisp->canvas->window, FALSE,
		      GDK_BUTTON1_MOTION_MASK | GDK_BUTTON_RELEASE_MASK,
		      NULL, NULL, bevent->time);
  else
    gdk_pointer_grab (gdisp->canvas->window, FALSE,
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		      GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON1_MOTION_MASK |
		      GDK_BUTTON_RELEASE_MASK,
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		      NULL, NULL, bevent->time);
  
  tool->gdisp_ptr = gdisp_ptr;
  tool->state = ACTIVE;

  b = ink_pen_ellipse (x, y, 
		       bevent->pressure, bevent->xtilt, bevent->ytilt);

  ink_paste (ink_tool, drawable, b);
  ink_tool->last_blob = b;

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  gdisplay_flush_now (gdisp);
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}

static void
ink_button_release (Tool           *tool,
		    GdkEventButton *bevent,
		    gpointer        gdisp_ptr)
{
  GDisplay * gdisp;
  GImage * gimage;
  InkTool * ink_tool;

  gdisp = (GDisplay *) gdisp_ptr;
  gimage = gdisp->gimage;
  ink_tool = (InkTool *) tool->private;

  /*  resume the current selection and ungrab the pointer  */
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  gdisplays_selection_visibility (gdisp->gimage, SelectionResume);
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  gdk_pointer_ungrab (bevent->time);
  gdk_flush ();

  /*  Set tool state to inactive -- no longer painting */
  tool->state = INACTIVE;

  ink_finish (ink_tool, gimage_active_drawable (gdisp->gimage), tool->ID);
  gdisplays_flush ();
}

static void
ink_motion (Tool           *tool,
	    GdkEventMotion *mevent,
	    gpointer        gdisp_ptr)
{
  GDisplay *gdisp;
  InkTool  *ink_tool;
  GimpDrawable *drawable;
  Blob *b, *blob_union;

  double x, y;

  gdisp = (GDisplay *) gdisp_ptr;
  ink_tool = (InkTool *) tool->private;

  gdisplay_untransform_coords_f (gdisp, mevent->x, mevent->y, &x, &y, TRUE);
  drawable = gimage_active_drawable (gdisp->gimage);

  b = ink_pen_ellipse (x, y, 
		       mevent->pressure, mevent->xtilt, mevent->ytilt);
  blob_union = blob_convex_union (ink_tool->last_blob, b);
  g_free (ink_tool->last_blob);
  ink_tool->last_blob = b;

  ink_paste (ink_tool, drawable, blob_union);  
  g_free (blob_union);
  
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  gdisplay_flush_now (gdisp);
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}

static void
ink_cursor_update (Tool           *tool,
		   GdkEventMotion *mevent,
		   gpointer        gdisp_ptr)
{
  GDisplay *gdisp;
  Layer *layer;
  GdkCursorType ctype = GDK_TOP_LEFT_ARROW;
  int x, y;

  gdisp = (GDisplay *) gdisp_ptr;

  gdisplay_untransform_coords (gdisp, mevent->x, mevent->y, &x, &y, FALSE, FALSE);
  if ((layer = gimage_get_active_layer (gdisp->gimage))) 
    {
      int off_x, off_y;
      drawable_offsets (GIMP_DRAWABLE(layer), &off_x, &off_y);
    if (x >= off_x && y >= off_y &&
	x < (off_x + drawable_width (GIMP_DRAWABLE(layer))) &&
	y < (off_y + drawable_height (GIMP_DRAWABLE(layer))))
      {
	/*  One more test--is there a selected region?
	 *  if so, is cursor inside?
	 */
	if (gimage_mask_is_empty (gdisp->gimage))
	  ctype = GDK_PENCIL;
	else if (gimage_mask_value (gdisp->gimage, x, y))
	  ctype = GDK_PENCIL;
      }
    }
  gdisplay_install_tool_cursor (gdisp, ctype);
}

static void
ink_control (Tool     *tool,
	     int       action,
	     gpointer  gdisp_ptr)
{
  GDisplay *gdisp;
  GimpDrawable *drawable;
  InkTool *ink_tool;

  gdisp = (GDisplay *) gdisp_ptr;
  ink_tool = (InkTool *) tool->private;
  drawable = gimage_active_drawable (gdisp->gimage);

  switch (action)
    {
    case PAUSE :
      draw_core_pause (ink_tool->core, tool);
      break;
    case RESUME :
      draw_core_resume (ink_tool->core, tool);
      break;
    case HALT :
      ink_cleanup ();
      break;
    }
}

static void
ink_init (InkTool *ink_tool, GimpDrawable *drawable, 
		 double x, double y)
{
  /*  free the block structures  */
  if (undo_tiles)
    tile_manager_destroy (undo_tiles);
  if (canvas_tiles)
    tile_manager_destroy (canvas_tiles);

  /*  Allocate the undo structure  */
  undo_tiles = tile_manager_new (drawable_width (drawable),
				 drawable_height (drawable),
				 drawable_bytes (drawable));

  /*  Allocate the canvas blocks structure  */
  canvas_tiles = tile_manager_new (drawable_width (drawable),
				   drawable_height (drawable), 1);

  /*  Get the initial undo extents  */
  ink_tool->x1 = ink_tool->x2 = x;
  ink_tool->y1 = ink_tool->y2 = y;
}

static void
ink_finish (InkTool *ink_tool, GimpDrawable *drawable, int tool_id)
{
  /*  push an undo  */
  drawable_apply_image (drawable, ink_tool->x1, ink_tool->y1,
			ink_tool->x2, ink_tool->y2, undo_tiles, TRUE);
  undo_tiles = NULL;

  /*  invalidate the drawable--have to do it here, because
   *  it is not done during the actual painting.
   */
  drawable_invalidate_preview (drawable);
}

static void
ink_cleanup (void)
{
  /*  CLEANUP  */
  /*  If the undo tiles exist, nuke them  */
  if (undo_tiles)
    {
      tile_manager_destroy (undo_tiles);
      undo_tiles = NULL;
    }

  /*  If the canvas blocks exist, nuke them  */
  if (canvas_tiles)
    {
      tile_manager_destroy (canvas_tiles);
      canvas_tiles = NULL;
    }

  /*  Free the temporary buffer if it exist  */
  if (canvas_buf)
    temp_buf_free (canvas_buf);
  canvas_buf = NULL;
}

/*********************************
 *  Rendering functions          *
 *********************************/

/* Some of this stuff should probably be combined with the 
 * code it was copied from in paint_core.c; but I wanted
 * to learn this stuff, so I've kept it simple.
 *
 * The following only supports CONSTANT mode. Incremental
 * would, I think, interact strangely with the way we
 * do things. But it wouldn't be hard to implement at all.
 */

static void
ink_set_paint_area (InkTool      *ink_tool, 
		    GimpDrawable *drawable, 
		    Blob         *blob)
{
  int x, y, width, height;
  int x1, y1, x2, y2;
  int bytes;
  
  blob_bounds (blob, &x, &y, &width, &height);

  bytes = drawable_has_alpha (drawable) ?
    drawable_bytes (drawable) : drawable_bytes (drawable) + 1;

  x1 = CLAMP (x/SUBSAMPLE - 1,            0, drawable_width (drawable));
  y1 = CLAMP (y/SUBSAMPLE - 1,            0, drawable_height (drawable));
  x2 = CLAMP ((x + width)/SUBSAMPLE + 2,  0, drawable_width (drawable));
  y2 = CLAMP ((y + height)/SUBSAMPLE + 2, 0, drawable_height (drawable));

  /*  configure the canvas buffer  */
  if ((x2 - x1) && (y2 - y1))
    canvas_buf = temp_buf_resize (canvas_buf, bytes, x1, y1,
				  (x2 - x1), (y2 - y1));
}

enum { ROW_START, ROW_STOP };

/* The insertion sort here, for SUBSAMPLE = 8, tends to beat out
 * qsort() by 4x with CFLAGS=-O2, 2x with CFLAGS=-g
 */
static void insert_sort (int *data, int n)
{
  int i, j, k;
  int tmp1, tmp2;

  for (i=2; i<2*n; i+=2)
    {
      tmp1 = data[i];
      tmp2 = data[i+1];
      j = 0;
      while (data[j] < tmp1)
	j += 2;

      for (k=i; k>j; k-=2)
	{
	  data[k] = data[k-2];
	  data[k+1] = data[k-1];
	}

      data[j] = tmp1;
      data[j+1] = tmp2;
    }
}

static void
fill_run (guchar *dest,
	  guchar  alpha,
	  int     w)
{
  if (alpha == 255)
    {
      memset (dest, 255, w);
    }
  else
    {
      while (w--)
	{
	  *dest += ((256 - *dest) * alpha) >> 8;
	  dest++;
	}
    }
}

static void
render_blob_line (Blob *blob, guchar *dest,
		  int x, int y, int width)
{
  int buf[4*SUBSAMPLE];
  int *data = buf;
  int n = 0;
  int i, j;
  int current = 0;		/* number of filled rows at this point
				 * in the scan line */

  int last_x;

  /* Sort start and ends for all lines */
  
  j = y * SUBSAMPLE - blob->y;
  for (i=0; i<SUBSAMPLE; i++)
    {
      if (j >= blob->height)
	break;
      if ((j > 0) && (blob->data[j].left <= blob->data[j].right))
	{
	  data[2*n] = blob->data[j].left;
	  data[2*n+1] = ROW_START;
	  data[2*SUBSAMPLE+2*n] = blob->data[j].right;
	  data[2*SUBSAMPLE+2*n+1] = ROW_STOP;
	  n++;
	}
      j++;
    }

  /*   If we have less than SUBSAMPLE rows, compress */
  if (n < SUBSAMPLE)
    {
      for (i=0; i<2*n; i++)
	data[2*n+i] = data[2*SUBSAMPLE+i];
    }

  /*   Now count start and end separately */
  n *= 2;

  insert_sort (data, n);

  /* Discard portions outside of tile */

  while ((n > 0) && (data[0] < SUBSAMPLE*x))
    {
      if (data[1] == ROW_START)
	current++;
      else
	current--;
      data += 2;
      n--;
    }

  while ((n > 0) && (data[2*(n-1)] >= SUBSAMPLE*(x+width)))
    n--;
  
  /* Render the row */

  last_x = 0;
  for (i=0; i<n;)
    {
      int cur_x = data[2*i] / SUBSAMPLE - x;
      int pixel;

      /* Fill in portion leading up to this pixel */
      if (current && cur_x != last_x)
	fill_run (dest + last_x, (255*current)/SUBSAMPLE, cur_x - last_x);

      /* Compute the value for this pixel */
      pixel = current * SUBSAMPLE; 

      while (i<n)
	{
	  int tmp_x = data[2*i] / SUBSAMPLE;
	  if (tmp_x - x != cur_x)
	    break;

	  if (data[2*i+1] == ROW_START)
	    {
	      current++;
	      pixel += ((tmp_x + 1) * SUBSAMPLE) - data[2*i];
	    }
	  else
	    {
	      current--;
	      pixel -= ((tmp_x + 1) * SUBSAMPLE) - data[2*i];
	    }
	  
	  i++;
	}

      /* Fill in the pixel */
      dest[cur_x] += 
	((256 - dest[cur_x]) * pixel * 255) / (256 * SUBSAMPLE * SUBSAMPLE);

      last_x = cur_x + 1;
    }

  if (current != 0)
    fill_run (dest + last_x, (255*current)/SUBSAMPLE, width - last_x);
}

static void
render_blob (PixelRegion *dest, Blob *blob)
{
  int i;
  int h;
  unsigned char * s;
  void * pr;

  for (pr = pixel_regions_register (1, dest); 
       pr != NULL; 
       pr = pixel_regions_process (pr))
    {
      h = dest->h;
      s = dest->data;

      for (i=0; i<h; i++)
	{
	  render_blob_line (blob, s,
			    dest->x, dest->y + i, dest->w);
	  s += dest->rowstride;
	}
    }
}

static void
ink_paste (InkTool      *ink_tool, 
	   GimpDrawable *drawable,
	   Blob         *blob)
{
  GImage *gimage;
  PixelRegion srcPR;
  int offx, offy;
  unsigned char col[MAX_CHANNELS];

  if (! (gimage = drawable_gimage (drawable)))
    return;
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  /* Get the the buffer */
  ink_set_paint_area (ink_tool, drawable, blob);
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  /* check to make sure there is actually a canvas to draw on */
  if (!canvas_buf)
    return;
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  gimage_get_foreground (gimage, drawable, col);

  /*  set the alpha channel  */
  col[canvas_buf->bytes - 1] = OPAQUE_OPACITY;

  /*  color the pixels  */
  color_pixels (temp_buf_data (canvas_buf), col,
		canvas_buf->width * canvas_buf->height, canvas_buf->bytes);

  /*  set undo blocks  */
  ink_set_undo_tiles (drawable,
		      canvas_buf->x, canvas_buf->y,
		      canvas_buf->width, canvas_buf->height);

  /*  initialize any invalid canvas tiles  */
  ink_set_canvas_tiles (canvas_buf->x, canvas_buf->y,
			canvas_buf->width, canvas_buf->height);

  ink_to_canvas_tiles (ink_tool, blob, col);

  /*  initialize canvas buf source pixel regions  */
  srcPR.bytes = canvas_buf->bytes;
  srcPR.x = 0; srcPR.y = 0;
  srcPR.w = canvas_buf->width;
  srcPR.h = canvas_buf->height;
  srcPR.rowstride = canvas_buf->width * canvas_buf->bytes;
  srcPR.data = temp_buf_data (canvas_buf);

  /*  apply the paint area to the gimage  */
  gimage_apply_image (gimage, drawable, &srcPR,
		      FALSE, 
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		      (int) (gimp_brush_get_opacity () * 255),
		      gimp_brush_get_paint_mode(),
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		      undo_tiles,  /*  specify an alternative src1  */
		      canvas_buf->x, canvas_buf->y);

  /*  Update the undo extents  */
  ink_tool->x1 = MIN (ink_tool->x1, canvas_buf->x);
  ink_tool->y1 = MIN (ink_tool->y1, canvas_buf->y);
  ink_tool->x2 = MAX (ink_tool->x2, (canvas_buf->x + canvas_buf->width));
  ink_tool->y2 = MAX (ink_tool->y2, (canvas_buf->y + canvas_buf->height));

  /*  Update the gimage--it is important to call gdisplays_update_area
   *  instead of drawable_update because we don't want the drawable
   *  preview to be constantly invalidated
   */
  drawable_offsets (drawable, &offx, &offy);
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  gdisplays_update_area (gimage, canvas_buf->x + offx, canvas_buf->y + offy,
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			 canvas_buf->width, canvas_buf->height);
}

static void
ink_to_canvas_tiles (InkTool *ink_tool,
		     Blob    *blob,
		     guchar  *color)
{
  PixelRegion srcPR, maskPR;

  /*  draw the blob on the canvas tiles  */
  pixel_region_init (&srcPR, canvas_tiles,
		     canvas_buf->x, canvas_buf->y,
		     canvas_buf->width, canvas_buf->height, TRUE);

  render_blob (&srcPR, blob);

  /*  combine the canvas tiles and the canvas buf  */
  srcPR.bytes = canvas_buf->bytes;
  srcPR.x = 0; srcPR.y = 0;
  srcPR.w = canvas_buf->width;
  srcPR.h = canvas_buf->height;
  srcPR.rowstride = canvas_buf->width * canvas_buf->bytes;
  srcPR.data = temp_buf_data (canvas_buf);

  pixel_region_init (&maskPR, canvas_tiles,
		     canvas_buf->x, canvas_buf->y,
		     canvas_buf->width, canvas_buf->height, FALSE);

  /*  apply the canvas tiles to the canvas buf  */
  apply_mask_to_region (&srcPR, &maskPR, OPAQUE_OPACITY);
}

static void
ink_set_undo_tiles (drawable, x, y, w, h)
     GimpDrawable *drawable;
     int x, y;
     int w, h;
{
  int i, j;
  Tile *src_tile;
  Tile *dest_tile;

  for (i = y; i < (y + h); i += (TILE_HEIGHT - (i % TILE_HEIGHT)))
    {
      for (j = x; j < (x + w); j += (TILE_WIDTH - (j % TILE_WIDTH)))
	{
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	  dest_tile = tile_manager_get_tile (undo_tiles, j, i, FALSE, FALSE);
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	  if (tile_is_valid (dest_tile) == FALSE)
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	    {
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	      src_tile = tile_manager_get_tile (drawable_data (drawable), j, i, TRUE, FALSE);
	      tile_manager_map_tile (undo_tiles, j, i, src_tile);
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	      tile_release (src_tile, FALSE);
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	    }
	}
    }
}


static void
ink_set_canvas_tiles (x, y, w, h)
     int x, y;
     int w, h;
{
  int i, j;
  Tile *tile;

  for (i = y; i < (y + h); i += (TILE_HEIGHT - (i % TILE_HEIGHT)))
    {
      for (j = x; j < (x + w); j += (TILE_WIDTH - (j % TILE_WIDTH)))
	{
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	  tile = tile_manager_get_tile (canvas_tiles, j, i, FALSE, FALSE);
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	  if (tile_is_valid (tile) == FALSE)
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	    {
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	      tile = tile_manager_get_tile (canvas_tiles, j, i, TRUE, TRUE);
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	      memset (tile_data_pointer (tile, 0, 0), 
		      0, 
		      tile_size (tile));
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	      tile_release (tile, TRUE);
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	    }
	}
    }
}

/****************************/
/*  Global ink functions  */
/****************************/

void
ink_no_draw (Tool *tool)
{
  return;
}

Tool *
tools_new_ink ()
{
  Tool * tool;
  InkTool * private;

  if (! ink_options)
    ink_options = create_ink_options ();

  tool = (Tool *) g_malloc (sizeof (Tool));
  private = (InkTool *) g_malloc (sizeof (InkTool));

  private->core = draw_core_new (ink_no_draw);
  private->last_blob = NULL;

  tool->type = INK;
  tool->state = INACTIVE;
  tool->scroll_lock = 0;  /*  Allow scrolling  */
  tool->auto_snap_to = TRUE;
  tool->gdisp_ptr = NULL;
  tool->private = private;
  tool->preserve = TRUE;

  tool->button_press_func = ink_button_press;
  tool->button_release_func = ink_button_release;
  tool->motion_func = ink_motion;
  tool->arrow_keys_func = standard_arrow_keys_func;
  tool->cursor_update_func = ink_cursor_update;
  tool->control_func = ink_control;

  return tool;
}

void
tools_free_ink (Tool *tool)
{
  InkTool * ink_tool;

  ink_tool = (InkTool *) tool->private;

  /*  Make sure the selection core is not visible  */
  if (tool->state == ACTIVE && ink_tool->core)
    draw_core_stop (ink_tool->core, tool);

  /*  Free the selection core  */
  if (ink_tool->core)
    draw_core_free (ink_tool->core);

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  /*  Free the last blob, if any */
  if (ink_tool->last_blob)
    g_free (ink_tool->last_blob);
  
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  /*  Cleanup memory  */
  ink_cleanup ();

  /*  Free the paint core  */
  g_free (ink_tool);
}


/*  The ink procedure definition  */
ProcArg ink_args[] =
{
  { PDB_IMAGE,
    "image",
    "the image"
  },
  { PDB_DRAWABLE,
    "drawable",
    "the drawable"
  },
  { PDB_INT32,
    "num_strokes",
    "number of stroke control points (count each coordinate as 2 points)"
  },
  { PDB_FLOATARRAY,
    "strokes",
    "array of stroke coordinates: {s1.x, s1.y, s2.x, s2.y, ..., sn.x, sn.y}"
  }
};


ProcRecord ink_proc =
{
  "gimp_ink",
  "Paint in the current brush without sub-pixel sampling",
  "fixme fixme",
  "Spencer Kimball & Peter Mattis",
  "Spencer Kimball & Peter Mattis",
  "1995-1996",
  PDB_INTERNAL,

  /*  Input arguments  */
  4,
  ink_args,

  /*  Output arguments  */
  0,
  NULL,

  /*  Exec method  */
  { { ink_invoker } },
};

static Argument *
ink_invoker (args)
     Argument *args;
{
  /* Fix me */
  return NULL;
}