gimpcurvestool.c 47 KB
Newer Older
Elliot Lee's avatar
Elliot Lee committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
/* 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
16
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Elliot Lee's avatar
Elliot Lee committed
17
 */
Sven Neumann's avatar
Sven Neumann committed
18

19 20 21
#include "config.h"

#include <stdio.h>
22 23
#include <stdlib.h>
#include <string.h>
24

Sven Neumann's avatar
Sven Neumann committed
25 26
#include <gtk/gtk.h>

27
#include "libgimpmath/gimpmath.h"
28
#include "libgimpbase/gimpbase.h"
29
#include "libgimpwidgets/gimpwidgets.h"
30

Michael Natterer's avatar
Michael Natterer committed
31 32 33 34 35 36 37 38 39
#include "tools-types.h"

#include "base/gimphistogram.h"
#include "base/gimplut.h"

#include "core/gimpdrawable.h"
#include "core/gimpimage.h"

#include "widgets/gimpcursor.h"
Michael Natterer's avatar
Michael Natterer committed
40
#include "widgets/gimpwidgets-utils.h"
Michael Natterer's avatar
Michael Natterer committed
41

42
#include "display/gimpdisplay.h"
43
#include "display/gimpdisplay-foreach.h"
44

Michael Natterer's avatar
Michael Natterer committed
45 46 47
#include "gimpcurvestool.h"
#include "tool_manager.h"
#include "tool_options.h"
Sven Neumann's avatar
Sven Neumann committed
48

49
#include "app_procs.h"
50
#include "image_map.h"
51

52 53
#include "libgimp/gimpintl.h"

54

55 56 57 58 59 60
#define GRAPH          0x1
#define XRANGE_TOP     0x2
#define XRANGE_BOTTOM  0x4
#define YRANGE         0x8
#define DRAW          0x10
#define ALL           0xFF
Elliot Lee's avatar
Elliot Lee committed
61

62
/*  NB: take care when changing these values: make sure the curve[] array in
63
 *  gimpcurvestool.h is large enough.
64
 */
65 66 67 68 69 70
#define GRAPH_WIDTH    256
#define GRAPH_HEIGHT   256
#define XRANGE_WIDTH   256
#define XRANGE_HEIGHT   16
#define YRANGE_WIDTH    16
#define YRANGE_HEIGHT  256
Elliot Lee's avatar
Elliot Lee committed
71 72 73 74 75 76 77 78 79 80 81 82 83 84 85
#define RADIUS           3
#define MIN_DISTANCE     8

#define RANGE_MASK  GDK_EXPOSURE_MASK | \
                    GDK_ENTER_NOTIFY_MASK

#define GRAPH_MASK  GDK_EXPOSURE_MASK | \
		    GDK_POINTER_MOTION_MASK | \
		    GDK_POINTER_MOTION_HINT_MASK | \
                    GDK_ENTER_NOTIFY_MASK | \
		    GDK_BUTTON_PRESS_MASK | \
		    GDK_BUTTON_RELEASE_MASK | \
		    GDK_BUTTON1_MOTION_MASK


86
typedef gdouble CRMatrix[4][4];
87

Michael Natterer's avatar
Michael Natterer committed
88

Michael Natterer's avatar
Michael Natterer committed
89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117
/*  local function prototypes  */

static void   gimp_curves_tool_class_init     (GimpCurvesToolClass *klass);
static void   gimp_curves_tool_init           (GimpCurvesTool      *bc_tool);

static void   gimp_curves_tool_initialize     (GimpTool       *tool,
					       GDisplay       *gdisp);
static void   gimp_curves_tool_control        (GimpTool       *tool,
					       ToolAction      action,
					       GDisplay       *gdisp);
static void   gimp_curves_tool_button_press   (GimpTool       *tool,
					       GdkEventButton *bevent,
					       GDisplay       *gdisp);
static void   gimp_curves_tool_button_release (GimpTool       *tool,
					       GdkEventButton *bevent,
					       GDisplay       *gdisp);
static void   gimp_curves_tool_motion         (GimpTool       *tool,
					       GdkEventMotion *mevent,
					       GDisplay       *gdisp);

static void   curves_colour_update            (GimpTool       *tool,
					       GDisplay       *gdisp,
					       GimpDrawable   *drawable,
					       gint            x,
					       gint            y);
static void   curves_add_point                (GimpDrawable   *drawable,
					       gint            x,
					       gint            y,
					       gint            cchan);
118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171

static CurvesDialog * curves_dialog_new   (void);

static void   curves_update               (CurvesDialog   *cd,
					   gint            );
static void   curves_plot_curve           (CurvesDialog   *cd,
					   gint            ,
					   gint            ,
					   gint            ,
					   gint            );
static void   curves_preview              (CurvesDialog   *cd);

static void   curves_channel_callback     (GtkWidget      *widget,
					   gpointer        data);

static void   curves_smooth_callback      (GtkWidget      *widget,
					   gpointer        data);
static void   curves_free_callback        (GtkWidget      *widget,
					   gpointer        data);

static void   curves_channel_reset        (gint            );
static void   curves_reset_callback       (GtkWidget      *widget,
					   gpointer        data);
static void   curves_ok_callback          (GtkWidget      *widget,
					   gpointer        data);
static void   curves_cancel_callback      (GtkWidget      *widget,
					   gpointer        data);
static void   curves_load_callback        (GtkWidget      *widget,
					   gpointer        data);
static void   curves_save_callback        (GtkWidget      *widget,
					   gpointer        data);
static void   curves_preview_update       (GtkWidget      *widget,
					   gpointer        data);
static gint   curves_xrange_events        (GtkWidget      *widget,
					   GdkEvent       *event,
					   CurvesDialog   *cd);
static gint   curves_yrange_events        (GtkWidget      *widget,
					   GdkEvent       *event,
					   CurvesDialog   *cd);
static gint   curves_graph_events         (GtkWidget      *widget,
					   GdkEvent       *event,
					   CurvesDialog   *cd);
static void   curves_CR_compose           (CRMatrix        ,
					   CRMatrix        ,
					   CRMatrix        );

static void   file_dialog_create          (GtkWidget      *widget);
static void   file_dialog_ok_callback     (GtkWidget      *widget,
					   gpointer        data);
static void   file_dialog_cancel_callback (GtkWidget      *widget,
					   gpointer        data);

static gboolean  curves_read_from_file    (FILE           *f);
static void      curves_write_to_file     (FILE           *f);
172 173


Michael Natterer's avatar
Michael Natterer committed
174
/*  the curves tool options  */
175
static GimpToolOptions  * curves_options = NULL;
Michael Natterer's avatar
Michael Natterer committed
176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199

/*  the curves dialog  */
static CurvesDialog * curves_dialog = NULL;

static GimpImageMapToolClass *parent_class = NULL;

/*  the curves file dialog  */
static GtkWidget *file_dlg = NULL;
static gboolean   load_save;

static GtkWidget *channel_items[5];

static CRMatrix CR_basis =
{
  { -0.5,  1.5, -1.5,  0.5 },
  {  1.0, -2.5,  2.0, -0.5 },
  { -0.5,  0.0,  0.5,  0.0 },
  {  0.0,  1.0,  0.0,  0.0 },
};


/*  functions  */

void
Michael Natterer's avatar
Michael Natterer committed
200
gimp_curves_tool_register (Gimp *gimp)
Michael Natterer's avatar
Michael Natterer committed
201
{
Michael Natterer's avatar
Michael Natterer committed
202 203
  tool_manager_register_tool (gimp,
			      GIMP_TYPE_CURVES_TOOL,
Michael Natterer's avatar
Michael Natterer committed
204 205 206 207 208 209
                              FALSE,
			      "gimp:curves_tool",
			      _("Curves"),
			      _("Adjust color curves"),
			      N_("/Image/Colors/Curves..."), NULL,
			      NULL, "tools/curves.html",
Michael Natterer's avatar
Michael Natterer committed
210
			      GIMP_STOCK_TOOL_CURVES);
Michael Natterer's avatar
Michael Natterer committed
211 212
}

213
GType
Michael Natterer's avatar
Michael Natterer committed
214 215
gimp_curves_tool_get_type (void)
{
216
  static GType tool_type = 0;
Michael Natterer's avatar
Michael Natterer committed
217 218 219

  if (! tool_type)
    {
220
      static const GTypeInfo tool_info =
Michael Natterer's avatar
Michael Natterer committed
221 222
      {
        sizeof (GimpCurvesToolClass),
223 224 225 226 227 228 229 230
	(GBaseInitFunc) NULL,
	(GBaseFinalizeFunc) NULL,
	(GClassInitFunc) gimp_curves_tool_class_init,
	NULL,           /* class_finalize */
	NULL,           /* class_data     */
	sizeof (GimpCurvesTool),
	0,              /* n_preallocs    */
	(GInstanceInitFunc) gimp_curves_tool_init,
Michael Natterer's avatar
Michael Natterer committed
231 232
      };

233 234 235
      tool_type = g_type_register_static (GIMP_TYPE_IMAGE_MAP_TOOL,
					  "GimpCurvesTool", 
                                          &tool_info, 0);
Michael Natterer's avatar
Michael Natterer committed
236 237 238 239 240 241 242 243
    }

  return tool_type;
}

static void
gimp_curves_tool_class_init (GimpCurvesToolClass *klass)
{
244
  GimpToolClass *tool_class;
Michael Natterer's avatar
Michael Natterer committed
245

246
  tool_class = GIMP_TOOL_CLASS (klass);
Michael Natterer's avatar
Michael Natterer committed
247

248
  parent_class = g_type_class_peek_parent (klass);
Michael Natterer's avatar
Michael Natterer committed
249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268

  tool_class->initialize     = gimp_curves_tool_initialize;
  tool_class->control        = gimp_curves_tool_control;
  tool_class->button_press   = gimp_curves_tool_button_press;
  tool_class->button_release = gimp_curves_tool_button_release;
  tool_class->motion         = gimp_curves_tool_motion;
}

static void
gimp_curves_tool_init (GimpCurvesTool *bc_tool)
{
  GimpTool *tool;

  tool = GIMP_TOOL (bc_tool);

  if (! curves_options)
    {
      curves_options = tool_options_new ();

      tool_manager_register_tool_options (GIMP_TYPE_CURVES_TOOL,
269
					  (GimpToolOptions *) curves_options);
Michael Natterer's avatar
Michael Natterer committed
270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379
    }
}

static void
gimp_curves_tool_initialize (GimpTool *tool,
			     GDisplay *gdisp)
{
  gint i, j;

  if (! gdisp)
    {
      curves_dialog_hide ();
      return;
    }

  if (gimp_drawable_is_indexed (gimp_image_active_drawable (gdisp->gimage)))
    {
      g_message (_("Curves for indexed drawables cannot be adjusted."));
      return;
    }

  /*  The curves dialog  */
  if (!curves_dialog)
    {
      curves_dialog = curves_dialog_new ();
    }
     
  /*  Initialize the values  */
  curves_dialog->channel = GIMP_HISTOGRAM_VALUE;
  for (i = 0; i < 5; i++)
    for (j = 0; j < 256; j++)
      curves_dialog->curve[i][j] = j;
  
  for (i = 0; i < 5; i++)
    {
      curves_channel_reset (i);
    }

  curves_dialog->drawable  = gimp_image_active_drawable (gdisp->gimage);
  curves_dialog->color     = gimp_drawable_is_rgb (curves_dialog->drawable);
  curves_dialog->image_map = image_map_create (gdisp, curves_dialog->drawable);

  /* check for alpha channel */
  if (gimp_drawable_has_alpha (curves_dialog->drawable))
    gtk_widget_set_sensitive (channel_items[4], TRUE);
  else 
    gtk_widget_set_sensitive (channel_items[4], FALSE);
  
  /*  hide or show the channel menu based on image type  */
  if (curves_dialog->color)
    for (i = 0; i < 4; i++) 
       gtk_widget_set_sensitive (channel_items[i], TRUE);
  else 
    for (i = 1; i < 4; i++) 
      gtk_widget_set_sensitive (channel_items[i], FALSE);

  /* set the current selection */
  gtk_option_menu_set_history (GTK_OPTION_MENU (curves_dialog->channel_menu),
			       curves_dialog->channel);

  gimp_lut_setup (curves_dialog->lut, 
		  (GimpLutFunc) curves_lut_func,
                  (gpointer) curves_dialog, 
		  gimp_drawable_bytes (curves_dialog->drawable));

  if (!GTK_WIDGET_VISIBLE (curves_dialog->shell))
    gtk_widget_show (curves_dialog->shell);

  curves_update (curves_dialog, GRAPH | DRAW);
}

static void
gimp_curves_tool_control (GimpTool   *tool,
			  ToolAction  action,
			  GDisplay   *gdisp)
{
  switch (action)
    {
    case PAUSE:
      break;

    case RESUME:
      break;

    case HALT:
      curves_dialog_hide ();
      break;

    default:
      break;
    }

  if (GIMP_TOOL_CLASS (parent_class)->control)
    GIMP_TOOL_CLASS (parent_class)->control (tool, action, gdisp);
}

static void
gimp_curves_tool_button_press (GimpTool       *tool,
			       GdkEventButton *bevent,
			       GDisplay       *gdisp)
{
  gint          x, y;
  GimpDrawable *drawable;

  drawable = gimp_image_active_drawable (gdisp->gimage);

  tool->gdisp = gdisp;

  if (drawable != tool->drawable)
    {
380
      tool->preserve = TRUE;
Michael Natterer's avatar
Michael Natterer committed
381
      image_map_abort (curves_dialog->image_map);
382
      tool->preserve = FALSE;
Michael Natterer's avatar
Michael Natterer committed
383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453

      tool->drawable = drawable;

      curves_dialog->drawable = drawable;
      curves_dialog->color = gimp_drawable_is_rgb (drawable);
      curves_dialog->image_map = image_map_create (gdisp, drawable);
    }

  tool->state = ACTIVE;

  gdisplay_untransform_coords (gdisp, bevent->x, bevent->y, &x, &y,
			       FALSE, FALSE);
  curves_colour_update (tool, gdisp, drawable, x, y);
  curves_update (curves_dialog, GRAPH | DRAW);
}

static void
gimp_curves_tool_button_release (GimpTool       *tool,
				 GdkEventButton *bevent,
				 GDisplay       *gdisp)
{
  gint          x, y;
  GimpDrawable *drawable;

  if (! curves_dialog || 
      ! gdisp || 
      ! (drawable = gimp_image_active_drawable (gdisp->gimage)))
     return;

  gdisplay_untransform_coords (gdisp, bevent->x, bevent->y, &x, &y,
			       FALSE, FALSE);
  curves_colour_update (tool, gdisp, drawable, x, y);

  if (bevent->state & GDK_SHIFT_MASK)
    {
      curves_add_point (drawable, x, y, curves_dialog->channel);
      curves_calculate_curve (curves_dialog);
    }
  else if (bevent->state & GDK_CONTROL_MASK)
    {
      curves_add_point (drawable, x, y, GIMP_HISTOGRAM_VALUE);
      curves_add_point (drawable, x, y, GIMP_HISTOGRAM_RED);
      curves_add_point (drawable, x, y, GIMP_HISTOGRAM_GREEN);
      curves_add_point (drawable, x, y, GIMP_HISTOGRAM_BLUE);
      curves_add_point (drawable, x, y, GIMP_HISTOGRAM_ALPHA);
      curves_calculate_curve (curves_dialog);
    }

  curves_update (curves_dialog, GRAPH | DRAW);
}

static void
gimp_curves_tool_motion (GimpTool       *tool,
			 GdkEventMotion *mevent,
			 GDisplay       *gdisp)
{
  gint          x, y;
  GimpDrawable *drawable;

  if (! curves_dialog ||
      ! gdisp || 
      ! (drawable = gimp_image_active_drawable (gdisp->gimage)))
     return;

  gdisplay_untransform_coords (gdisp, mevent->x, mevent->y, &x, &y,
			       FALSE, FALSE);
  curves_colour_update (tool, gdisp, drawable, x, y);
  curves_update (curves_dialog, GRAPH | DRAW);
}


Elliot Lee's avatar
Elliot Lee committed
454 455
/*  curves machinery  */

456
gfloat
Manish Singh's avatar
Manish Singh committed
457
curves_lut_func (CurvesDialog *cd,
458 459 460
		 gint          nchannels,
		 gint          channel,
		 gfloat        value)
Elliot Lee's avatar
Elliot Lee committed
461
{
462 463
  gfloat  f;
  gint    index;
464
  gdouble inten;
465
  gint    j;
Elliot Lee's avatar
Elliot Lee committed
466

467 468 469 470
  if (nchannels == 1)
    j = 0;
  else
    j = channel + 1;
471

472
  inten = value;
473

Manish Singh's avatar
Manish Singh committed
474
  /* For color images this runs through the loop with j = channel +1
475 476 477 478 479 480 481 482 483 484 485 486 487 488 489
     the first time and j = 0 the second time */
  /* For bw images this runs through the loop with j = 0 the first and
     only time  */
  for (; j >= 0; j -= (channel + 1))
  {
    /* don't apply the overall curve to the alpha channel */
    if (j == 0 && (nchannels == 2 || nchannels == 4)
	&& channel == nchannels -1)
      return inten;

    if (inten < 0.0)
      inten = cd->curve[j][0]/255.0;
    else if (inten >= 1.0)
      inten = cd->curve[j][255]/255.0;
    else /* interpolate the curve */
Elliot Lee's avatar
Elliot Lee committed
490
    {
491 492 493 494
      index = floor(inten * 255.0);
      f = inten*255.0 - index;
      inten = ((1.0 - f) * cd->curve[j][index    ] + 
	       (      f) * cd->curve[j][index + 1] ) / 255.0;
Elliot Lee's avatar
Elliot Lee committed
495
    }
496 497
  }
  return inten;
Elliot Lee's avatar
Elliot Lee committed
498 499
}

BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
500
static void
Michael Natterer's avatar
Michael Natterer committed
501
curves_colour_update (GimpTool       *tool,
Michael Natterer's avatar
Michael Natterer committed
502 503 504 505
		      GDisplay       *gdisp,
		      GimpDrawable   *drawable,
		      gint            x,
		      gint            y)
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
506
{
507 508 509 510
  guchar        *color;
  gint           offx;
  gint           offy;
  gint           maxval;
511 512 513
  gboolean       has_alpha;
  gboolean       is_indexed;
  GimpImageType  sample_type;
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
514

515
  if (!tool || tool->state != ACTIVE)
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
516 517
    return;

518
  gimp_drawable_offsets (drawable, &offx, &offy);
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
519 520 521 522

  x -= offx;
  y -= offy;

523
  if (!(color = image_map_get_color_at (curves_dialog->image_map, x, y)))
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
524 525
    return;

526
  sample_type = gimp_drawable_type (drawable);
527 528
  is_indexed  = gimp_drawable_is_indexed (drawable);
  has_alpha   = GIMP_IMAGE_TYPE_HAS_ALPHA (sample_type);
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
529

Michael Natterer's avatar
Michael Natterer committed
530 531 532
  curves_dialog->col_value[GIMP_HISTOGRAM_RED] = color[RED_PIX];
  curves_dialog->col_value[GIMP_HISTOGRAM_GREEN] = color[GREEN_PIX];
  curves_dialog->col_value[GIMP_HISTOGRAM_BLUE] = color[BLUE_PIX];
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
533 534 535

  if (has_alpha)
    {
Michael Natterer's avatar
Michael Natterer committed
536
      curves_dialog->col_value [GIMP_HISTOGRAM_ALPHA] = color[3];
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
537 538 539
    }

  if (is_indexed)
Michael Natterer's avatar
Michael Natterer committed
540
    curves_dialog->col_value [GIMP_HISTOGRAM_ALPHA] = color[4];
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
541

542
  maxval = MAX (color[RED_PIX], color[GREEN_PIX]);
Michael Natterer's avatar
Michael Natterer committed
543
  curves_dialog->col_value[GIMP_HISTOGRAM_VALUE] = MAX (maxval, color[BLUE_PIX]);
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
544

545
  g_free (color);
546
}
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
547

548
static void
549 550 551 552
curves_add_point (GimpDrawable *drawable,
		  gint          x,
		  gint          y,
		  gint          cchan)
553 554
{
  /* Add point onto the curve */
555 556 557 558
  gint closest_point = 0;
  gint distance;
  gint curvex;
  gint i;
559

560
  switch (curves_dialog->curve_type[cchan])
561
    {
562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584
    case SMOOTH:
      curvex = curves_dialog->col_value[cchan];
      distance = G_MAXINT;
      for (i = 0; i < 17; i++)
	{
	  if (curves_dialog->points[cchan][i][0] != -1)
	    if (abs (curvex - curves_dialog->points[cchan][i][0]) < distance)
	      {
		distance = abs (curvex - curves_dialog->points[cchan][i][0]);
		closest_point = i;
	      }
	}
      
      if (distance > MIN_DISTANCE)
	closest_point = (curvex + 8) / 16;
      
      curves_dialog->points[cchan][closest_point][0] = curvex;
      curves_dialog->points[cchan][closest_point][1] = curves_dialog->curve[cchan][curvex];
      break;
      
    case GFREE:
      curves_dialog->curve[cchan][x] = 255 - y;
      break;
585
    }
Elliot Lee's avatar
Elliot Lee committed
586 587
}

588 589 590 591 592 593 594
void
curves_dialog_hide (void)
{
  if (curves_dialog)
    curves_cancel_callback (NULL, (gpointer) curves_dialog);
}

Elliot Lee's avatar
Elliot Lee committed
595
void
596
curves_free (void)
Elliot Lee's avatar
Elliot Lee committed
597
{
598 599
  GimpTool *active_tool;

Elliot Lee's avatar
Elliot Lee committed
600 601 602 603
  if (curves_dialog)
    {
      if (curves_dialog->image_map)
	{
604 605
	  active_tool = tool_manager_get_active (the_gimp);

606
	  active_tool->preserve = TRUE;
Elliot Lee's avatar
Elliot Lee committed
607
	  image_map_abort (curves_dialog->image_map);
608
	  active_tool->preserve = FALSE;
609

Elliot Lee's avatar
Elliot Lee committed
610 611
	  curves_dialog->image_map = NULL;
	}
612

613 614
      gtk_widget_destroy (curves_dialog->shell);

Elliot Lee's avatar
Elliot Lee committed
615
      if (curves_dialog->pixmap)
Sven Neumann's avatar
Sven Neumann committed
616
	gdk_drawable_unref (curves_dialog->pixmap);
617

618 619 620 621 622 623 624 625 626 627
      if (curves_dialog->cursor_layout)
        g_object_unref (curves_dialog->cursor_layout);
      if (curves_dialog->xpos_layout)
        g_object_unref (curves_dialog->xpos_layout);

      if (curves_dialog->lut)
        gimp_lut_free (curves_dialog->lut);

      g_free (curves_dialog);
      curves_dialog = NULL;
Elliot Lee's avatar
Elliot Lee committed
628 629 630
    }
}

631 632 633
/*******************/
/*  Curves dialog  */
/*******************/
Elliot Lee's avatar
Elliot Lee committed
634

635
static CurvesDialog *
636
curves_dialog_new (void)
Elliot Lee's avatar
Elliot Lee committed
637 638 639 640
{
  CurvesDialog *cd;
  GtkWidget *vbox;
  GtkWidget *hbox;
641
  GtkWidget *hbbox;
Elliot Lee's avatar
Elliot Lee committed
642 643 644 645 646
  GtkWidget *label;
  GtkWidget *frame;
  GtkWidget *toggle;
  GtkWidget *channel_hbox;
  GtkWidget *table;
647
  GtkWidget *button;
648
  gint i, j;
649

650
  cd = g_new (CurvesDialog, 1);
651 652 653 654 655
  cd->preview       = TRUE;
  cd->pixmap        = NULL;
  cd->xpos_layout   = NULL;
  cd->cursor_layout = NULL;
  cd->channel       = GIMP_HISTOGRAM_VALUE;
656 657 658 659

  for (i = 0; i < 5; i++)
    cd->curve_type[i] = SMOOTH;

660 661 662
  for (i = 0; i < 5; i++)
    for (j = 0; j < 256; j++)
      cd->curve[i][j] = j;
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
663

664
  for (i = 0; i < (sizeof (cd->col_value) / sizeof (cd->col_value[0])); i++)
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
665 666
    cd->col_value[i] = 0;

667
  cd->lut = gimp_lut_new ();
Elliot Lee's avatar
Elliot Lee committed
668 669

  /*  The shell and main vbox  */
670
  cd->shell = gimp_dialog_new (_("Curves"), "curves",
Michael Natterer's avatar
Michael Natterer committed
671
			       tool_manager_help_func, NULL,
672 673 674
			       GTK_WIN_POS_NONE,
			       FALSE, TRUE, FALSE,

675
			       GTK_STOCK_OK, curves_ok_callback,
676
			       cd, NULL, NULL, TRUE, FALSE,
677
			       GIMP_STOCK_RESET, curves_reset_callback,
678
			       cd, NULL, NULL, FALSE, FALSE,
679
			       GTK_STOCK_CANCEL, curves_cancel_callback,
680
			       cd, NULL, NULL, FALSE, TRUE,
681 682

			       NULL);
Elliot Lee's avatar
Elliot Lee committed
683

684 685
  vbox = gtk_vbox_new (FALSE, 4);
  gtk_container_set_border_width (GTK_CONTAINER (vbox), 4);
686
  gtk_container_add (GTK_CONTAINER (GTK_DIALOG (cd->shell)->vbox), vbox);
Elliot Lee's avatar
Elliot Lee committed
687 688

  /*  The option menu for selecting channels  */
689
  channel_hbox = gtk_hbox_new (FALSE, 4);
Elliot Lee's avatar
Elliot Lee committed
690 691
  gtk_box_pack_start (GTK_BOX (vbox), channel_hbox, FALSE, FALSE, 0);

692
  label = gtk_label_new (_("Modify Curves for Channel:"));
Elliot Lee's avatar
Elliot Lee committed
693 694
  gtk_box_pack_start (GTK_BOX (channel_hbox), label, FALSE, FALSE, 0);

695
  cd->channel_menu = gimp_option_menu_new2
696 697 698 699
    (FALSE,
     G_CALLBACK (curves_channel_callback),
     cd,
     GINT_TO_POINTER (cd->channel),
700

701 702 703 704 705
     _("Value"), GINT_TO_POINTER (GIMP_HISTOGRAM_VALUE), &channel_items[0],
     _("Red"),   GINT_TO_POINTER (GIMP_HISTOGRAM_RED),   &channel_items[1],
     _("Green"), GINT_TO_POINTER (GIMP_HISTOGRAM_GREEN), &channel_items[2],
     _("Blue"),  GINT_TO_POINTER (GIMP_HISTOGRAM_BLUE),  &channel_items[3],
     _("Alpha"), GINT_TO_POINTER (GIMP_HISTOGRAM_ALPHA), &channel_items[4],
706 707 708

     NULL);

Elliot Lee's avatar
Elliot Lee committed
709 710 711 712 713 714 715 716
  gtk_box_pack_start (GTK_BOX (channel_hbox), cd->channel_menu, FALSE, FALSE, 2);

  gtk_widget_show (label);
  gtk_widget_show (cd->channel_menu);
  gtk_widget_show (channel_hbox);

  /*  The table for the yrange and the graph  */
  table = gtk_table_new (2, 2, FALSE);
717 718
  gtk_table_set_col_spacings (GTK_TABLE (table), 2);
  gtk_table_set_row_spacings (GTK_TABLE (table), 2);
Elliot Lee's avatar
Elliot Lee committed
719 720 721 722 723 724 725 726
  gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 0);

  /*  The range drawing area  */
  frame = gtk_frame_new (NULL);
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
  gtk_table_attach (GTK_TABLE (table), frame, 0, 1, 0, 1,
		    GTK_EXPAND, GTK_EXPAND, 0, 0);

727
  cd->yrange = gtk_preview_new (GTK_PREVIEW_COLOR);
Elliot Lee's avatar
Elliot Lee committed
728 729
  gtk_preview_size (GTK_PREVIEW (cd->yrange), YRANGE_WIDTH, YRANGE_HEIGHT);
  gtk_widget_set_events (cd->yrange, RANGE_MASK);
730 731
  gtk_container_add (GTK_CONTAINER (frame), cd->yrange);

732 733 734
  g_signal_connect (G_OBJECT (cd->yrange), "event",
		    G_CALLBACK (curves_yrange_events),
		    cd);
735

Elliot Lee's avatar
Elliot Lee committed
736 737 738 739 740 741 742
  gtk_widget_show (cd->yrange);
  gtk_widget_show (frame);

  /*  The curves graph  */
  frame = gtk_frame_new (NULL);
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
  gtk_table_attach (GTK_TABLE (table), frame, 1, 2, 0, 1,
743 744
		    GTK_SHRINK | GTK_FILL,
		    GTK_SHRINK | GTK_FILL, 0, 0);
Elliot Lee's avatar
Elliot Lee committed
745 746 747 748 749 750

  cd->graph = gtk_drawing_area_new ();
  gtk_drawing_area_size (GTK_DRAWING_AREA (cd->graph),
			 GRAPH_WIDTH + RADIUS * 2,
			 GRAPH_HEIGHT + RADIUS * 2);
  gtk_widget_set_events (cd->graph, GRAPH_MASK);
751 752
  gtk_container_add (GTK_CONTAINER (frame), cd->graph);

753 754 755
  g_signal_connect (G_OBJECT (cd->graph), "event",
		    G_CALLBACK (curves_graph_events),
		    cd);
756

Elliot Lee's avatar
Elliot Lee committed
757 758 759 760 761 762 763 764 765
  gtk_widget_show (cd->graph);
  gtk_widget_show (frame);

  /*  The range drawing area  */
  frame = gtk_frame_new (NULL);
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
  gtk_table_attach (GTK_TABLE (table), frame, 1, 2, 1, 2,
		    GTK_EXPAND, GTK_EXPAND, 0, 0);

766
  cd->xrange = gtk_preview_new (GTK_PREVIEW_COLOR);
Elliot Lee's avatar
Elliot Lee committed
767 768
  gtk_preview_size (GTK_PREVIEW (cd->xrange), XRANGE_WIDTH, XRANGE_HEIGHT);
  gtk_widget_set_events (cd->xrange, RANGE_MASK);
769 770
  gtk_container_add (GTK_CONTAINER (frame), cd->xrange);

771 772 773
  g_signal_connect (G_OBJECT (cd->xrange), "event",
		    G_CALLBACK (curves_xrange_events),
		    cd);
774

Elliot Lee's avatar
Elliot Lee committed
775 776 777 778 779
  gtk_widget_show (cd->xrange);
  gtk_widget_show (frame);
  gtk_widget_show (table);

  /*  Horizontal box for preview  */
780
  hbox = gtk_hbox_new (FALSE, 4);
781
  gtk_box_pack_end (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
Elliot Lee's avatar
Elliot Lee committed
782 783

  /*  The option menu for selecting the drawing method  */
784
  label = gtk_label_new (_("Curve Type:"));
Elliot Lee's avatar
Elliot Lee committed
785
  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
786
  gtk_widget_show (label);
Elliot Lee's avatar
Elliot Lee committed
787

788 789
  cd->curve_type_menu = gimp_option_menu_new
    (FALSE,
Elliot Lee's avatar
Elliot Lee committed
790

791 792 793 794 795
     _("Smooth"), curves_smooth_callback, cd, NULL, NULL, TRUE,
     _("Free"),   curves_free_callback,   cd, NULL, NULL, FALSE,

     NULL);
  gtk_box_pack_start (GTK_BOX (hbox), cd->curve_type_menu, FALSE, FALSE, 2);
796
  gtk_widget_show (cd->curve_type_menu);
797

Elliot Lee's avatar
Elliot Lee committed
798 799 800
  gtk_widget_show (hbox);

  /*  The preview toggle  */
801
  toggle = gtk_check_button_new_with_label (_("Preview"));
802
  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), cd->preview);
803 804
  gtk_box_pack_end (GTK_BOX (hbox), toggle, FALSE, FALSE, 0);

805 806 807
  g_signal_connect (G_OBJECT (toggle), "toggled",
		    G_CALLBACK (curves_preview_update),
		    cd);
Elliot Lee's avatar
Elliot Lee committed
808 809 810 811

  gtk_widget_show (toggle);
  gtk_widget_show (hbox);

812 813 814 815 816 817 818 819 820 821 822
  /*  Horizontal button box for load / save  */
  hbbox = gtk_hbutton_box_new ();
  gtk_button_box_set_spacing (GTK_BUTTON_BOX (hbbox), 4);
  gtk_button_box_set_layout (GTK_BUTTON_BOX (hbbox), GTK_BUTTONBOX_SPREAD);
  gtk_box_pack_end (GTK_BOX (vbox), hbbox, FALSE, FALSE, 0);

  button = gtk_button_new_with_label (_("Load"));
  GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
  gtk_box_pack_start (GTK_BOX (hbbox), button, FALSE, FALSE, 0);
  gtk_widget_show (button);

823 824 825 826
  g_signal_connect (G_OBJECT (button), "clicked",
		    G_CALLBACK (curves_load_callback),
		    cd->shell);

827 828 829 830 831
  button = gtk_button_new_with_label (_("Save"));
  GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
  gtk_box_pack_start (GTK_BOX (hbbox), button, FALSE, FALSE, 0);
  gtk_widget_show (button);

832 833 834 835
  g_signal_connect (G_OBJECT (button), "clicked",
		    G_CALLBACK (curves_save_callback),
		    cd->shell);

836
  gtk_widget_show (hbbox);
Elliot Lee's avatar
Elliot Lee committed
837 838 839 840 841
  gtk_widget_show (vbox);

  return cd;
}

842
static void
843 844 845
curve_print_loc (CurvesDialog *cd,
		 gint          xpos,
		 gint          ypos)
846
{
847
  gchar buf[32];
848

849
  if (!cd->cursor_layout)
850
    {
851 852 853 854
      cd->cursor_layout = gtk_widget_create_pango_layout (cd->graph,
                                                          "x:888 y:888");
      pango_layout_get_pixel_extents (cd->cursor_layout, 
                                      NULL, &cd->cursor_rect);
855 856
    }
  
857
  if (xpos >= 0 && xpos <= 255 && ypos >=0 && ypos <= 255)
858 859 860
    {
      gdk_draw_rectangle (cd->graph->window, 
			  cd->graph->style->bg_gc[GTK_STATE_ACTIVE],
861 862 863 864 865
			  TRUE, 
                          RADIUS*2 + 2, 
                          RADIUS*2 + 2, 
			  cd->cursor_rect.width  + 4,
			  cd->cursor_rect.height + 5);
866 867 868

      gdk_draw_rectangle (cd->graph->window, 
			  cd->graph->style->black_gc,
869 870 871 872 873 874 875 876 877 878 879 880 881
			  FALSE, 
                          RADIUS*2 + 2, 
                          RADIUS*2 + 2, 
			  cd->cursor_rect.width  + 3, 
			  cd->cursor_rect.height + 4);
      
      g_snprintf (buf, sizeof (buf), "x:%3d y:%3d",xpos, ypos);
      pango_layout_set_text (cd->cursor_layout, buf, 11);
      gdk_draw_layout (cd->graph->window, 
                       cd->graph->style->black_gc,
		       RADIUS*2 + 4 + cd->cursor_rect.x,
		       RADIUS*2 + 5 + cd->cursor_rect.y,
		       cd->cursor_layout);
882 883 884
    }
}

885
/* TODO: preview alpha channel stuff correctly.  -- austin, 20/May/99 */
Elliot Lee's avatar
Elliot Lee committed
886 887
static void
curves_update (CurvesDialog *cd,
888
	       gint          update)
Elliot Lee's avatar
Elliot Lee committed
889 890
{
  GdkRectangle area;
891 892 893
  gint   i, j;
  gchar  buf[32];
  gint   offset;
894
  gint   height;
895 896 897 898 899 900
  gint   sel_channel;
  
  if(cd->color) {
    sel_channel = cd->channel;
  } else {
    if(cd->channel == 2)
Michael Natterer's avatar
Michael Natterer committed
901
      sel_channel = GIMP_HISTOGRAM_ALPHA;
902
    else
Michael Natterer's avatar
Michael Natterer committed
903
      sel_channel = GIMP_HISTOGRAM_VALUE;
904 905
  }

Elliot Lee's avatar
Elliot Lee committed
906 907
  if (update & XRANGE_TOP)
    {
908
      guchar buf[XRANGE_WIDTH * 3];
909

910
      switch (sel_channel)
911
	{
Michael Natterer's avatar
Michael Natterer committed
912 913
	case GIMP_HISTOGRAM_VALUE:
	case GIMP_HISTOGRAM_ALPHA:
914
	  for (i = 0; i < XRANGE_HEIGHT / 2; i++)
915
	    {
916
	      for (j = 0; j < XRANGE_WIDTH ; j++)
917
		{
918 919 920
		  buf[j*3+0] = cd->curve[sel_channel][j];
		  buf[j*3+1] = cd->curve[sel_channel][j];
		  buf[j*3+2] = cd->curve[sel_channel][j];
921
		}
922 923
	      gtk_preview_draw_row (GTK_PREVIEW (cd->xrange),
				    buf, 0, i, XRANGE_WIDTH);
924
	    }
925 926
	  break;

Michael Natterer's avatar
Michael Natterer committed
927 928 929
	case GIMP_HISTOGRAM_RED:
	case GIMP_HISTOGRAM_GREEN:
	case GIMP_HISTOGRAM_BLUE:
930
	  {
931
	    for (i = 0; i < XRANGE_HEIGHT / 2; i++)
932
	      {
933 934
		for (j = 0; j < XRANGE_WIDTH; j++)
		  {
Michael Natterer's avatar
Michael Natterer committed
935 936 937
		    buf[j*3+0] = cd->curve[GIMP_HISTOGRAM_RED][j];
		    buf[j*3+1] = cd->curve[GIMP_HISTOGRAM_GREEN][j];
		    buf[j*3+2] = cd->curve[GIMP_HISTOGRAM_BLUE][j];
938 939 940
		  }
		gtk_preview_draw_row (GTK_PREVIEW (cd->xrange),
				      buf, 0, i, XRANGE_WIDTH);
941
	      }
942
	    break;
943 944
	  }

945
	default:
946 947 948
	  g_warning ("unknown channel type %d, can't happen!?!?",
		     cd->channel);
	  break;
949
	}
Elliot Lee's avatar
Elliot Lee committed
950 951 952 953 954 955 956 957 958 959 960 961

      if (update & DRAW)
	{
	  area.x = 0;
	  area.y = 0;
	  area.width = XRANGE_WIDTH;
	  area.height = XRANGE_HEIGHT / 2;
	  gtk_widget_draw (cd->xrange, &area);
	}
    }
  if (update & XRANGE_BOTTOM)
    {
962
      guchar buf[XRANGE_WIDTH * 3];
Elliot Lee's avatar
Elliot Lee committed
963 964

      for (i = 0; i < XRANGE_WIDTH; i++)
965 966 967 968 969
      {
	buf[i*3+0] = i;
	buf[i*3+1] = i;
	buf[i*3+2] = i;
      }
Elliot Lee's avatar
Elliot Lee committed
970 971 972 973 974 975 976 977 978 979 980 981 982 983 984

      for (i = XRANGE_HEIGHT / 2; i < XRANGE_HEIGHT; i++)
	gtk_preview_draw_row (GTK_PREVIEW (cd->xrange), buf, 0, i, XRANGE_WIDTH);

      if (update & DRAW)
	{
	  area.x = 0;
	  area.y = XRANGE_HEIGHT / 2;
	  area.width = XRANGE_WIDTH;
	  area.height = XRANGE_HEIGHT / 2;
	  gtk_widget_draw (cd->xrange, &area);
	}
    }
  if (update & YRANGE)
    {
985 986
      guchar buf[YRANGE_WIDTH * 3];
      guchar pix[3];
Elliot Lee's avatar
Elliot Lee committed
987 988 989

      for (i = 0; i < YRANGE_HEIGHT; i++)
	{
990
	  switch (sel_channel)
991
	    {
Michael Natterer's avatar
Michael Natterer committed
992 993
	    case GIMP_HISTOGRAM_VALUE:
	    case GIMP_HISTOGRAM_ALPHA:
994 995 996
	      pix[0] = pix[1] = pix[2] = (255 - i);
	      break;

Michael Natterer's avatar
Michael Natterer committed
997 998 999
	    case GIMP_HISTOGRAM_RED:
	    case GIMP_HISTOGRAM_GREEN:
	    case GIMP_HISTOGRAM_BLUE:
1000
	      pix[0] = pix[1] = pix[2] = 0;
1001
	      pix[sel_channel - 1] = (255 - i);
1002 1003
	      break;

1004
	    default:
1005 1006 1007
	      g_warning ("unknown channel type %d, can't happen!?!?",
			 cd->channel);
	      break;
1008
	    }
1009 1010

	  for (j = 0; j < YRANGE_WIDTH * 3; j++)
1011
	    buf[j] = pix[j%3];
Elliot Lee's avatar
Elliot Lee committed
1012

1013 1014
	  gtk_preview_draw_row (GTK_PREVIEW (cd->yrange),
				buf, 0, i, YRANGE_WIDTH);
Elliot Lee's avatar
Elliot Lee committed
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025
	}

      if (update & DRAW)
	gtk_widget_draw (cd->yrange, NULL);
    }
  if ((update & GRAPH) && (update & DRAW) && cd->pixmap != NULL)
    {
      GdkPoint points[256];

      /*  Clear the pixmap  */
      gdk_draw_rectangle (cd->pixmap, cd->graph->style->bg_gc[GTK_STATE_NORMAL],
1026 1027
			  TRUE, 0, 0,
			  GRAPH_WIDTH + RADIUS * 2, GRAPH_HEIGHT + RADIUS * 2);
Elliot Lee's avatar
Elliot Lee committed
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048

      /*  Draw the grid lines  */
      for (i = 0; i < 5; i++)
	{
	  gdk_draw_line (cd->pixmap, cd->graph->style->dark_gc[GTK_STATE_NORMAL],
			 RADIUS, i * (GRAPH_HEIGHT / 4) + RADIUS,
			 GRAPH_WIDTH + RADIUS, i * (GRAPH_HEIGHT / 4) + RADIUS);
	  gdk_draw_line (cd->pixmap, cd->graph->style->dark_gc[GTK_STATE_NORMAL],
			 i * (GRAPH_WIDTH / 4) + RADIUS, RADIUS,
			 i * (GRAPH_WIDTH / 4) + RADIUS, GRAPH_HEIGHT + RADIUS);
	}

      /*  Draw the curve  */
      for (i = 0; i < 256; i++)
	{
	  points[i].x = i + RADIUS;
	  points[i].y = 255 - cd->curve[cd->channel][i] + RADIUS;
	}
      gdk_draw_points (cd->pixmap, cd->graph->style->black_gc, points, 256);

      /*  Draw the points  */
1049
      if (cd->curve_type[cd->channel] == SMOOTH)
Elliot Lee's avatar
Elliot Lee committed
1050 1051 1052 1053 1054 1055 1056 1057 1058
	for (i = 0; i < 17; i++)
	  {
	    if (cd->points[cd->channel][i][0] != -1)
	      gdk_draw_arc (cd->pixmap, cd->graph->style->black_gc, TRUE,
			    cd->points[cd->channel][i][0],
			    255 - cd->points[cd->channel][i][1],
			    RADIUS * 2, RADIUS * 2, 0, 23040);
	  }

BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
1059
      /* draw the colour line */
1060
      gdk_draw_line (cd->pixmap, cd->graph->style->black_gc,
1061 1062
		     cd->col_value[sel_channel]+RADIUS,RADIUS,
		     cd->col_value[sel_channel]+RADIUS,GRAPH_HEIGHT + RADIUS);
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
1063

1064
      /* and xpos indicator */
1065
      g_snprintf (buf, sizeof (buf), "x:%d",cd->col_value[sel_channel]);
1066 1067 1068 1069 1070 1071

      if (!cd->xpos_layout)
        cd->xpos_layout = gtk_widget_create_pango_layout (cd->graph, buf);
      else
        pango_layout_set_text (cd->xpos_layout, buf, -1);

1072
      if ((cd->col_value[sel_channel]+RADIUS) < 127)
1073 1074 1075 1076 1077
	{
	  offset = RADIUS + 4;
	}
      else
	{
1078 1079
          pango_layout_get_pixel_size (cd->xpos_layout, &offset, &height);
          offset = - (offset + 2);
1080 1081
	}

1082
      gdk_draw_layout (cd->pixmap,
1083
		       cd->graph->style->black_gc,
1084 1085 1086 1087 1088 1089 1090 1091 1092 1093
		       cd->col_value[sel_channel] + offset,
		       GRAPH_HEIGHT - height - 2,
		       cd->xpos_layout);

      gdk_draw_drawable (cd->graph->window, 
                         cd->graph->style->black_gc, 
                         cd->pixmap,
			 0, 0, 
                         0, 0, 
                         GRAPH_WIDTH + RADIUS * 2, GRAPH_HEIGHT + RADIUS * 2);
Elliot Lee's avatar
Elliot Lee committed
1094 1095 1096 1097 1098
    }
}

static void
curves_plot_curve (CurvesDialog *cd,
1099 1100 1101 1102
		   gint          p1,
		   gint          p2,
		   gint          p3,
		   gint          p4)
Elliot Lee's avatar
Elliot Lee committed
1103 1104 1105 1106
{
  CRMatrix geometry;
  CRMatrix tmp1, tmp2;
  CRMatrix deltas;
1107 1108 1109 1110 1111 1112
  gdouble  x, dx, dx2, dx3;
  gdouble  y, dy, dy2, dy3;
  gdouble  d, d2, d3;
  gint     lastx, lasty;
  gint32   newx, newy;
  gint     i;
Elliot Lee's avatar
Elliot Lee committed
1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158

  /* construct the geometry matrix from the segment */
  for (i = 0; i < 4; i++)
    {
      geometry[i][2] = 0;
      geometry[i][3] = 0;
    }

  for (i = 0; i < 2; i++)
    {
      geometry[0][i] = cd->points[cd->channel][p1][i];
      geometry[1][i] = cd->points[cd->channel][p2][i];
      geometry[2][i] = cd->points[cd->channel][p3][i];
      geometry[3][i] = cd->points[cd->channel][p4][i];
    }

  /* subdivide the curve 1000 times */
  /* n can be adjusted to give a finer or coarser curve */
  d = 1.0 / 1000;
  d2 = d * d;
  d3 = d * d * d;

  /* construct a temporary matrix for determining the forward differencing deltas */
  tmp2[0][0] = 0;     tmp2[0][1] = 0;     tmp2[0][2] = 0;    tmp2[0][3] = 1;
  tmp2[1][0] = d3;    tmp2[1][1] = d2;    tmp2[1][2] = d;    tmp2[1][3] = 0;
  tmp2[2][0] = 6*d3;  tmp2[2][1] = 2*d2;  tmp2[2][2] = 0;    tmp2[2][3] = 0;
  tmp2[3][0] = 6*d3;  tmp2[3][1] = 0;     tmp2[3][2] = 0;    tmp2[3][3] = 0;

  /* compose the basis and geometry matrices */
  curves_CR_compose (CR_basis, geometry, tmp1);

  /* compose the above results to get the deltas matrix */
  curves_CR_compose (tmp2, tmp1, deltas);

  /* extract the x deltas */
  x = deltas[0][0];
  dx = deltas[1][0];
  dx2 = deltas[2][0];
  dx3 = deltas[3][0];

  /* extract the y deltas */
  y = deltas[0][1];
  dy = deltas[1][1];
  dy2 = deltas[2][1];
  dy3 = deltas[3][1];

1159 1160
  lastx = CLAMP (x, 0, 255);
  lasty = CLAMP (y, 0, 255);
Elliot Lee's avatar
Elliot Lee committed
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176

  cd->curve[cd->channel][lastx] = lasty;

  /* loop over the curve */
  for (i = 0; i < 1000; i++)
    {
      /* increment the x values */
      x += dx;
      dx += dx2;
      dx2 += dx3;

      /* increment the y values */
      y += dy;
      dy += dy2;
      dy2 += dy3;

1177 1178
      newx = CLAMP0255 (ROUND (x));
      newy = CLAMP0255 (ROUND (y));
Elliot Lee's avatar
Elliot Lee committed
1179 1180 1181 1182 1183 1184 1185 1186 1187 1188

      /* if this point is different than the last one...then draw it */
      if ((lastx != newx) || (lasty != newy))
	cd->curve[cd->channel][newx] = newy;

      lastx = newx;
      lasty = newy;
    }
}

Manish Singh's avatar
Manish Singh committed
1189
void
Elliot Lee's avatar
Elliot Lee committed
1190 1191
curves_calculate_curve (CurvesDialog *cd)
{
1192 1193 1194 1195
  gint i;
  gint points[17];
  gint num_pts;
  gint p1, p2, p3, p4;
Elliot Lee's avatar
Elliot Lee committed
1196

1197
  switch (cd->curve_type[cd->channel])