gimpcurvestool.c 36.3 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
 */
18 19
#include "config.h"

Elliot Lee's avatar
Elliot Lee committed
20 21
#include <stdlib.h>
#include <string.h>
22

Elliot Lee's avatar
Elliot Lee committed
23 24 25 26 27 28 29 30
#include "appenv.h"
#include "actionarea.h"
#include "buildmenu.h"
#include "colormaps.h"
#include "cursorutil.h"
#include "drawable.h"
#include "general.h"
#include "gdisplay.h"
31
#include "gimphistogram.h"
Elliot Lee's avatar
Elliot Lee committed
32 33
#include "interface.h"
#include "curves.h"
34
#include "gimplut.h"
Elliot Lee's avatar
Elliot Lee committed
35

36
#include "libgimp/gimpintl.h"
37
#include "libgimp/gimpmath.h"
38

Elliot Lee's avatar
Elliot Lee committed
39 40 41 42 43 44 45
#define GRAPH              0x1
#define XRANGE_TOP         0x2
#define XRANGE_BOTTOM      0x4
#define YRANGE             0x8
#define DRAW               0x10
#define ALL                0xFF

46 47 48
/*  NB: take care when changing these values: make sure the curve[] array in
 *  curves.h is large enough.
 */
Elliot Lee's avatar
Elliot Lee committed
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68
#define GRAPH_WIDTH      256
#define GRAPH_HEIGHT     256
#define XRANGE_WIDTH     256
#define XRANGE_HEIGHT    16
#define YRANGE_WIDTH     16
#define YRANGE_HEIGHT    256
#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

69
/*  the curves structures  */
Elliot Lee's avatar
Elliot Lee committed
70

71
typedef struct _Curves Curves;
Elliot Lee's avatar
Elliot Lee committed
72 73 74 75 76 77 78
struct _Curves
{
  int x, y;    /*  coords for last mouse click  */
};

typedef double CRMatrix[4][4];

79

80
/*  the curves tool options  */
81
static ToolOptions  * curves_options = NULL;
82 83

/*  the curves dialog  */
84
static CurvesDialog * curves_dialog = NULL;
85 86 87 88 89 90 91 92 93

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 },
};

Elliot Lee's avatar
Elliot Lee committed
94

95
/*  curves action functions  */
Michael Natterer's avatar
Michael Natterer committed
96

Elliot Lee's avatar
Elliot Lee committed
97 98 99
static void   curves_button_press   (Tool *, GdkEventButton *, gpointer);
static void   curves_button_release (Tool *, GdkEventButton *, gpointer);
static void   curves_motion         (Tool *, GdkEventMotion *, gpointer);
Michael Natterer's avatar
Michael Natterer committed
100 101
static void   curves_control        (Tool *, ToolAction,       gpointer);

102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122
static CurvesDialog * curves_new_dialog (void);

static void   curves_update          (CurvesDialog *, int);
static void   curves_plot_curve      (CurvesDialog *, int, int, int, int);
static void   curves_preview         (CurvesDialog *);
static void   curves_value_callback  (GtkWidget *, gpointer);
static void   curves_red_callback    (GtkWidget *, gpointer);
static void   curves_green_callback  (GtkWidget *, gpointer);
static void   curves_blue_callback   (GtkWidget *, gpointer);
static void   curves_alpha_callback  (GtkWidget *, gpointer);
static void   curves_smooth_callback (GtkWidget *, gpointer);
static void   curves_free_callback   (GtkWidget *, gpointer);
static void   curves_reset_callback  (GtkWidget *, gpointer);
static void   curves_ok_callback     (GtkWidget *, gpointer);
static void   curves_cancel_callback (GtkWidget *, gpointer);
static gint   curves_delete_callback (GtkWidget *, GdkEvent *, gpointer);
static void   curves_preview_update  (GtkWidget *, gpointer);
static gint   curves_xrange_events   (GtkWidget *, GdkEvent *, CurvesDialog *);
static gint   curves_yrange_events   (GtkWidget *, GdkEvent *, CurvesDialog *);
static gint   curves_graph_events    (GtkWidget *, GdkEvent *, CurvesDialog *);
static void   curves_CR_compose      (CRMatrix, CRMatrix, CRMatrix);
Elliot Lee's avatar
Elliot Lee committed
123

124

Elliot Lee's avatar
Elliot Lee committed
125 126
/*  curves machinery  */

Manish Singh's avatar
Manish Singh committed
127 128 129
float
curves_lut_func (CurvesDialog *cd,
		 int nchannels, int channel, float value)
Elliot Lee's avatar
Elliot Lee committed
130
{
131 132 133 134
  float f;
  int index;
  double inten;
  int j;
Elliot Lee's avatar
Elliot Lee committed
135

136 137 138 139 140
  if (nchannels == 1)
    j = 0;
  else
    j = channel + 1;
  inten = value;
Manish Singh's avatar
Manish Singh committed
141
  /* For color images this runs through the loop with j = channel +1
142 143 144 145 146 147 148 149 150 151 152 153 154 155 156
     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
157
    {
158 159 160 161
      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
162
    }
163 164
  }
  return inten;
Elliot Lee's avatar
Elliot Lee committed
165 166
}

BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
167
static void
Michael Natterer's avatar
Michael Natterer committed
168 169 170 171 172
curves_colour_update (Tool           *tool,
		      GDisplay       *gdisp,
		      GimpDrawable   *drawable,
		      gint            x,
		      gint            y)
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211
{
  unsigned char *color;
  int offx, offy;
  int has_alpha;
  int is_indexed;
  int sample_type;
  int maxval;

  if(!tool || tool->state != ACTIVE)
    return;

  drawable_offsets (drawable, &offx, &offy);

  x -= offx;
  y -= offy;

  if (!(color = image_map_get_color_at(curves_dialog->image_map, x, y)))
    return;

  sample_type = gimp_drawable_type(drawable);
  is_indexed = gimp_drawable_indexed (drawable);
  has_alpha = TYPE_HAS_ALPHA(sample_type);

  curves_dialog->col_value[HISTOGRAM_RED] = color[RED_PIX];
  curves_dialog->col_value[HISTOGRAM_GREEN] = color[GREEN_PIX];
  curves_dialog->col_value[HISTOGRAM_BLUE] = color[BLUE_PIX];

  if (has_alpha)
    {
      curves_dialog->col_value [HISTOGRAM_ALPHA] = color[3];
    }

  if (is_indexed)
    curves_dialog->col_value [HISTOGRAM_ALPHA] = color[4];

  maxval = MAXIMUM(color[RED_PIX],color[GREEN_PIX]);
  curves_dialog->col_value[HISTOGRAM_VALUE] = MAXIMUM(maxval,color[BLUE_PIX]);

  g_free(color);
212
}
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
213

214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239
static void
curves_add_point(GimpDrawable * drawable,gint x, gint y,gint cchan)
{
  /* Add point onto the curve */
  int closest_point = 0;
  int distance;
  int curvex;
  int i;

  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];
Elliot Lee's avatar
Elliot Lee committed
240 241
}

242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278
/*  curves action functions  */

static void
curves_button_press (Tool           *tool,
		     GdkEventButton *bevent,
		     gpointer        gdisp_ptr)
{
  GDisplay *gdisp;
  gint x, y;
  GimpDrawable * drawable;

  gdisp = gdisp_ptr;
  drawable = gimage_active_drawable (gdisp->gimage);

  tool->gdisp_ptr = gdisp;

  if (drawable != tool->drawable)
    {
      active_tool->preserve = TRUE;
      image_map_abort (curves_dialog->image_map);
      active_tool->preserve = FALSE;

      tool->drawable = drawable;

      curves_dialog->drawable = drawable;
      curves_dialog->color = drawable_color (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);
}

Elliot Lee's avatar
Elliot Lee committed
279 280 281 282 283
static void
curves_button_release (Tool           *tool,
		       GdkEventButton *bevent,
		       gpointer        gdisp_ptr)
{
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
284 285 286 287 288 289 290 291 292 293 294 295 296
  gint x, y;
  GimpDrawable * drawable;
  GDisplay *gdisp;

  gdisp = (GDisplay *) gdisp_ptr;

  if(!curves_dialog || 
     !gdisp || 
     !(drawable = gimage_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);
297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313

  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,HISTOGRAM_VALUE);
      curves_add_point(drawable,x,y,HISTOGRAM_RED);
      curves_add_point(drawable,x,y,HISTOGRAM_GREEN);
      curves_add_point(drawable,x,y,HISTOGRAM_BLUE);
      curves_add_point(drawable,x,y,HISTOGRAM_ALPHA);
      curves_calculate_curve(curves_dialog);
    }

  curves_update (curves_dialog, GRAPH | DRAW);
Elliot Lee's avatar
Elliot Lee committed
314 315 316 317 318 319 320
}

static void
curves_motion (Tool           *tool,
	       GdkEventMotion *mevent,
	       gpointer        gdisp_ptr)
{
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
321 322 323 324 325 326 327 328 329 330 331 332 333
  GDisplay *gdisp;
  gint x, y;
  GimpDrawable * drawable;

  gdisp = (GDisplay *) gdisp_ptr;

  if(!curves_dialog || 
     !gdisp || 
     !(drawable = gimage_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);
334
  curves_update (curves_dialog, GRAPH | DRAW);
Elliot Lee's avatar
Elliot Lee committed
335 336 337
}

static void
Michael Natterer's avatar
Michael Natterer committed
338 339 340
curves_control (Tool       *tool,
		ToolAction  action,
		gpointer    gdisp_ptr)
Elliot Lee's avatar
Elliot Lee committed
341 342 343
{
  switch (action)
    {
344
    case PAUSE:
Elliot Lee's avatar
Elliot Lee committed
345
      break;
Michael Natterer's avatar
Michael Natterer committed
346

347
    case RESUME:
Elliot Lee's avatar
Elliot Lee committed
348
      break;
Michael Natterer's avatar
Michael Natterer committed
349

350
    case HALT:
Elliot Lee's avatar
Elliot Lee committed
351
      if (curves_dialog)
352
	curves_cancel_callback (NULL, (gpointer) curves_dialog);
Elliot Lee's avatar
Elliot Lee committed
353
      break;
Michael Natterer's avatar
Michael Natterer committed
354 355 356

    default:
      break;
Elliot Lee's avatar
Elliot Lee committed
357 358 359 360 361 362 363 364 365 366 367
    }
}

Tool *
tools_new_curves ()
{
  Tool * tool;
  Curves * private;

  /*  The tool options  */
  if (!curves_options)
368
    {
369 370
      curves_options = tool_options_new (_("Curves Options"));
      tools_register (CURVES, curves_options);
371
    }
Elliot Lee's avatar
Elliot Lee committed
372

373 374
  tool = tools_new_tool (CURVES);
  private = g_new (Curves, 1);
Elliot Lee's avatar
Elliot Lee committed
375

376 377
  tool->scroll_lock = TRUE;   /*  Disallow scrolling  */
  tool->preserve    = FALSE;  /*  Don't preserve on drawable change  */
378

379
  tool->private = (void *) private;
380

381
  tool->button_press_func   = curves_button_press;
Elliot Lee's avatar
Elliot Lee committed
382
  tool->button_release_func = curves_button_release;
383 384
  tool->motion_func         = curves_motion;
  tool->control_func        = curves_control;
385

Elliot Lee's avatar
Elliot Lee committed
386 387 388 389 390 391 392 393 394 395 396 397
  return tool;
}

void
tools_free_curves (Tool *tool)
{
  Curves * _curves;

  _curves = (Curves *) tool->private;

  /*  Close the color select dialog  */
  if (curves_dialog)
398
    curves_cancel_callback (NULL, (gpointer) curves_dialog);
Elliot Lee's avatar
Elliot Lee committed
399 400 401 402 403 404

  g_free (_curves);
}

static MenuItem channel_items[] =
{
405 406 407 408 409
  { N_("Value"), 0, 0, curves_value_callback, NULL, NULL, NULL },
  { N_("Red"), 0, 0, curves_red_callback, NULL, NULL, NULL },
  { N_("Green"), 0, 0, curves_green_callback, NULL, NULL, NULL },
  { N_("Blue"), 0, 0, curves_blue_callback, NULL, NULL, NULL },
  { N_("Alpha"), 0, 0, curves_alpha_callback, NULL, NULL, NULL },
Elliot Lee's avatar
Elliot Lee committed
410 411 412 413
  { NULL, 0, 0, NULL, NULL, NULL, NULL }
};

void
414
curves_initialize (GDisplay *gdisp)
Elliot Lee's avatar
Elliot Lee committed
415 416 417 418 419
{
  int i, j;

  if (drawable_indexed (gimage_active_drawable (gdisp->gimage)))
    {
420
      g_message (_("Curves for indexed drawables cannot be adjusted."));
Elliot Lee's avatar
Elliot Lee committed
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
      return;
    }

  /*  The curves dialog  */
  if (!curves_dialog)
    curves_dialog = curves_new_dialog ();

  /*  Initialize the values  */
  curves_dialog->channel = HISTOGRAM_VALUE;
  for (i = 0; i < 5; i++)
    for (j = 0; j < 256; j++)
      curves_dialog->curve[i][j] = j;

  curves_dialog->grab_point = -1;
  for (i = 0; i < 5; i++)
    {
      for (j = 0; j < 17; j++)
	{
	  curves_dialog->points[i][j][0] = -1;
	  curves_dialog->points[i][j][1] = -1;
	}
      curves_dialog->points[i][0][0] = 0;
      curves_dialog->points[i][0][1] = 0;
      curves_dialog->points[i][16][0] = 255;
      curves_dialog->points[i][16][1] = 255;
    }

448 449
  curves_dialog->drawable = gimage_active_drawable (gdisp->gimage);
  curves_dialog->color = drawable_color ( (curves_dialog->drawable));
450
  curves_dialog->image_map = image_map_create (gdisp, curves_dialog->drawable);
Elliot Lee's avatar
Elliot Lee committed
451 452

  /* check for alpha channel */
453
  if (drawable_has_alpha ( (curves_dialog->drawable)))
Elliot Lee's avatar
Elliot Lee committed
454 455 456 457 458 459 460 461 462 463 464 465 466
    gtk_widget_set_sensitive( channel_items[4].widget, TRUE);
  else 
    gtk_widget_set_sensitive( channel_items[4].widget, 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].widget, TRUE);
  else 
    for (i = 1; i < 4; i++) 
       gtk_widget_set_sensitive( channel_items[i].widget, FALSE);

  /* set the current selection */
467
  gtk_option_menu_set_history (GTK_OPTION_MENU (curves_dialog->channel_menu), 0);
Elliot Lee's avatar
Elliot Lee committed
468

469 470
  if (!GTK_WIDGET_VISIBLE (curves_dialog->shell))
    gtk_widget_show (curves_dialog->shell);
Elliot Lee's avatar
Elliot Lee committed
471 472 473 474 475 476 477 478 479 480 481

  curves_update (curves_dialog, GRAPH | DRAW);
}

void
curves_free ()
{
  if (curves_dialog)
    {
      if (curves_dialog->image_map)
	{
482
	  active_tool->preserve = TRUE;
Elliot Lee's avatar
Elliot Lee committed
483
	  image_map_abort (curves_dialog->image_map);
484
	  active_tool->preserve = FALSE;
485

Elliot Lee's avatar
Elliot Lee committed
486 487
	  curves_dialog->image_map = NULL;
	}
488

Elliot Lee's avatar
Elliot Lee committed
489
      if (curves_dialog->pixmap)
490
	gdk_pixmap_unref (curves_dialog->pixmap);
491

Elliot Lee's avatar
Elliot Lee committed
492 493 494 495
      gtk_widget_destroy (curves_dialog->shell);
    }
}

496 497 498
/*******************/
/*  Curves dialog  */
/*******************/
Elliot Lee's avatar
Elliot Lee committed
499

500
static CurvesDialog *
Elliot Lee's avatar
Elliot Lee committed
501 502 503 504 505 506 507 508 509 510 511 512
curves_new_dialog ()
{
  CurvesDialog *cd;
  GtkWidget *vbox;
  GtkWidget *hbox;
  GtkWidget *label;
  GtkWidget *frame;
  GtkWidget *toggle;
  GtkWidget *option_menu;
  GtkWidget *channel_hbox;
  GtkWidget *menu;
  GtkWidget *table;
513
  int i, j;
Elliot Lee's avatar
Elliot Lee committed
514

515 516 517 518 519 520 521 522 523 524 525 526 527 528
  static ActionAreaItem action_items[] =
  {
    { N_("Reset"), curves_reset_callback, NULL, NULL },
    { N_("OK"), curves_ok_callback, NULL, NULL },
    { N_("Cancel"), curves_cancel_callback, NULL, NULL }
  };

  static MenuItem curve_type_items[] =
  {
    { N_("Smooth"), 0, 0, curves_smooth_callback, NULL, NULL, NULL },
    { N_("Free"), 0, 0, curves_free_callback, NULL, NULL, NULL },
    { NULL, 0, 0, NULL, NULL, NULL, NULL }
  };

Elliot Lee's avatar
Elliot Lee committed
529 530 531 532
  cd = g_malloc (sizeof (CurvesDialog));
  cd->preview = TRUE;
  cd->curve_type = SMOOTH;
  cd->pixmap = NULL;
533 534 535 536
  cd->channel = HISTOGRAM_VALUE;
  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
537 538 539 540

  for(i = 0; i < (sizeof(cd->col_value)/sizeof(cd->col_value[0])); i++)
    cd->col_value[i] = 0;

541
  cd->lut = gimp_lut_new();
Elliot Lee's avatar
Elliot Lee committed
542 543 544 545 546 547 548 549

  for (i = 0; i < 5; i++)
    channel_items [i].user_data = (gpointer) cd;
  for (i = 0; i < 2; i++)
    curve_type_items [i].user_data = (gpointer) cd;

  /*  The shell and main vbox  */
  cd->shell = gtk_dialog_new ();
550
  gtk_window_set_wmclass (GTK_WINDOW (cd->shell), "curves", "Gimp");
551
  gtk_window_set_title (GTK_WINDOW (cd->shell), _("Curves"));
Elliot Lee's avatar
Elliot Lee committed
552 553 554 555 556 557

  gtk_signal_connect (GTK_OBJECT (cd->shell), "delete_event",
		      GTK_SIGNAL_FUNC (curves_delete_callback),
		      cd);
  
  vbox = gtk_vbox_new (FALSE, 2);
558
  gtk_container_set_border_width (GTK_CONTAINER (vbox), 2);
Elliot Lee's avatar
Elliot Lee committed
559 560 561 562 563 564
  gtk_box_pack_start (GTK_BOX (GTK_DIALOG (cd->shell)->vbox), vbox, TRUE, TRUE, 0);

  /*  The option menu for selecting channels  */
  channel_hbox = gtk_hbox_new (FALSE, 2);
  gtk_box_pack_start (GTK_BOX (vbox), channel_hbox, FALSE, FALSE, 0);

565
  label = gtk_label_new (_("Modify Curves for Channel: "));
Elliot Lee's avatar
Elliot Lee committed
566 567 568 569 570 571 572 573 574 575 576 577 578
  gtk_box_pack_start (GTK_BOX (channel_hbox), label, FALSE, FALSE, 0);

  menu = build_menu (channel_items, NULL);
  cd->channel_menu = gtk_option_menu_new ();
  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);
  gtk_option_menu_set_menu (GTK_OPTION_MENU (cd->channel_menu), menu);

  /*  The table for the yrange and the graph  */
  table = gtk_table_new (2, 2, FALSE);
579
  gtk_container_set_border_width (GTK_CONTAINER (table), 2);
Elliot Lee's avatar
Elliot Lee committed
580 581 582 583 584 585 586 587
  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);

588
  cd->yrange = gtk_preview_new (GTK_PREVIEW_COLOR);
Elliot Lee's avatar
Elliot Lee committed
589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622
  gtk_preview_size (GTK_PREVIEW (cd->yrange), YRANGE_WIDTH, YRANGE_HEIGHT);
  gtk_widget_set_events (cd->yrange, RANGE_MASK);
  gtk_signal_connect (GTK_OBJECT (cd->yrange), "event",
		      (GtkSignalFunc) curves_yrange_events,
		      cd);
  gtk_container_add (GTK_CONTAINER (frame), cd->yrange);
  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,
		    GTK_EXPAND | GTK_SHRINK | GTK_FILL,
		    GTK_FILL, 0, 0);

  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);
  gtk_signal_connect (GTK_OBJECT (cd->graph), "event",
		      (GtkSignalFunc) curves_graph_events,
		      cd);
  gtk_container_add (GTK_CONTAINER (frame), cd->graph);
  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);

623
  cd->xrange = gtk_preview_new (GTK_PREVIEW_COLOR);
Elliot Lee's avatar
Elliot Lee committed
624 625 626 627 628 629 630 631 632 633 634 635 636 637 638
  gtk_preview_size (GTK_PREVIEW (cd->xrange), XRANGE_WIDTH, XRANGE_HEIGHT);
  gtk_widget_set_events (cd->xrange, RANGE_MASK);
  gtk_signal_connect (GTK_OBJECT (cd->xrange), "event",
		      (GtkSignalFunc) curves_xrange_events,
		      cd);
  gtk_container_add (GTK_CONTAINER (frame), cd->xrange);
  gtk_widget_show (cd->xrange);
  gtk_widget_show (frame);
  gtk_widget_show (table);

  /*  Horizontal box for preview  */
  hbox = gtk_hbox_new (FALSE, 2);
  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);

  /*  The option menu for selecting the drawing method  */
639
  label = gtk_label_new (_("Curve Type: "));
Elliot Lee's avatar
Elliot Lee committed
640 641 642 643 644 645 646 647 648 649 650 651
  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);

  menu = build_menu (curve_type_items, NULL);
  option_menu = gtk_option_menu_new ();
  gtk_box_pack_start (GTK_BOX (hbox), option_menu, FALSE, FALSE, 2);

  gtk_widget_show (label);
  gtk_widget_show (option_menu);
  gtk_widget_show (hbox);
  gtk_option_menu_set_menu (GTK_OPTION_MENU (option_menu), menu);

  /*  The preview toggle  */
652
  toggle = gtk_check_button_new_with_label (_("Preview"));
653
  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), cd->preview);
Elliot Lee's avatar
Elliot Lee committed
654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673
  gtk_box_pack_start (GTK_BOX (hbox), toggle, TRUE, FALSE, 0);
  gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
		      (GtkSignalFunc) curves_preview_update,
		      cd);

  gtk_widget_show (label);
  gtk_widget_show (toggle);
  gtk_widget_show (hbox);

  /*  The action area  */
  action_items[0].user_data = cd;
  action_items[1].user_data = cd;
  action_items[2].user_data = cd;
  build_action_area (GTK_DIALOG (cd->shell), action_items, 3, 0);

  gtk_widget_show (vbox);

  return cd;
}

674
/* TODO: preview alpha channel stuff correctly.  -- austin, 20/May/99 */
Elliot Lee's avatar
Elliot Lee committed
675 676 677 678 679 680 681 682 683
static void
curves_update (CurvesDialog *cd,
	       int           update)
{
  GdkRectangle area;
  int i, j;

  if (update & XRANGE_TOP)
    {
684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724
      unsigned char buf[XRANGE_WIDTH * 3];

      switch (cd->channel) {
      case HISTOGRAM_VALUE:
      case HISTOGRAM_ALPHA:
	  for (i = 0; i < XRANGE_HEIGHT / 2; i++)
	  {
	      for (j = 0; j < XRANGE_WIDTH ; j++)
	      {
		  buf[j*3+0] = cd->curve[cd->channel][j];
		  buf[j*3+1] = cd->curve[cd->channel][j];
		  buf[j*3+2] = cd->curve[cd->channel][j];
	      }
	      gtk_preview_draw_row (GTK_PREVIEW (cd->xrange),
				    buf, 0, i, XRANGE_WIDTH);
	  }
	  break;

      case HISTOGRAM_RED:
      case HISTOGRAM_GREEN:
      case HISTOGRAM_BLUE:
      {	  
	  for (i = 0; i < XRANGE_HEIGHT / 2; i++)
	  {
	      for (j = 0; j < XRANGE_WIDTH; j++)
	      {
		  buf[j*3+0] = cd->curve[HISTOGRAM_RED][j];
		  buf[j*3+1] = cd->curve[HISTOGRAM_GREEN][j];
		  buf[j*3+2] = cd->curve[HISTOGRAM_BLUE][j];
	      }
	      gtk_preview_draw_row (GTK_PREVIEW (cd->xrange),
				    buf, 0, i, XRANGE_WIDTH);
	  }
	  break;
      }

      default:
	  g_warning ("unknown channel type %d, can't happen!?!?",
		     cd->channel);
	  break;
      } /* end switch */
Elliot Lee's avatar
Elliot Lee committed
725 726 727 728 729 730 731 732 733 734 735 736

      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)
    {
737
      unsigned char buf[XRANGE_WIDTH * 3];
Elliot Lee's avatar
Elliot Lee committed
738 739

      for (i = 0; i < XRANGE_WIDTH; i++)
740 741 742 743 744
      {
	buf[i*3+0] = i;
	buf[i*3+1] = i;
	buf[i*3+2] = i;
      }
Elliot Lee's avatar
Elliot Lee committed
745 746 747 748 749 750 751 752 753 754 755 756 757 758 759

      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)
    {
760 761
      unsigned char buf[YRANGE_WIDTH * 3];
      unsigned char pix[3];
Elliot Lee's avatar
Elliot Lee committed
762 763 764

      for (i = 0; i < YRANGE_HEIGHT; i++)
	{
765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785
	  switch (cd->channel) {
	  case HISTOGRAM_VALUE:
	  case HISTOGRAM_ALPHA:
	      pix[0] = pix[1] = pix[2] = (255 - i);
	      break;

	  case HISTOGRAM_RED:
	  case HISTOGRAM_GREEN:
	  case HISTOGRAM_BLUE:
	      pix[0] = pix[1] = pix[2] = 0;
	      pix[cd->channel - 1] = (255 - i);
	      break;

	  default:
	      g_warning ("unknown channel type %d, can't happen!?!?",
			 cd->channel);
	      break;
	  }

	  for (j = 0; j < YRANGE_WIDTH * 3; j++)
	      buf[j] = pix[j%3];
Elliot Lee's avatar
Elliot Lee committed
786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831

	  gtk_preview_draw_row (GTK_PREVIEW (cd->yrange), buf, 0, i, YRANGE_WIDTH);

	}

      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],
			  TRUE, 0, 0, GRAPH_WIDTH + RADIUS * 2, GRAPH_HEIGHT + RADIUS * 2);

      /*  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  */
      if (cd->curve_type == SMOOTH)
	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
832 833
      /* draw the colour line */
      gdk_draw_line(cd->pixmap, cd->graph->style->black_gc,
834 835
		    cd->col_value[cd->channel]+RADIUS,RADIUS,
		    cd->col_value[cd->channel]+RADIUS,GRAPH_HEIGHT + RADIUS);
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
836

Elliot Lee's avatar
Elliot Lee committed
837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855
      gdk_draw_pixmap (cd->graph->window, cd->graph->style->black_gc, cd->pixmap,
		       0, 0, 0, 0, GRAPH_WIDTH + RADIUS * 2, GRAPH_HEIGHT + RADIUS * 2);
    }
}

static void
curves_plot_curve (CurvesDialog *cd,
		   int           p1,
		   int           p2,
		   int           p3,
		   int           p4)
{
  CRMatrix geometry;
  CRMatrix tmp1, tmp2;
  CRMatrix deltas;
  double x, dx, dx2, dx3;
  double y, dy, dy2, dy3;
  double d, d2, d3;
  int lastx, lasty;
856
  gint32 newx, newy;
Elliot Lee's avatar
Elliot Lee committed
857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921
  int i;

  /* 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];

  lastx = BOUNDS (x, 0, 255);
  lasty = BOUNDS (y, 0, 255);

  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;

922 923
      newx = CLAMP0255 (ROUND (x));
      newy = CLAMP0255 (ROUND (y));
Elliot Lee's avatar
Elliot Lee committed
924 925 926 927 928 929 930 931 932 933

      /* 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
934
void
Elliot Lee's avatar
Elliot Lee committed
935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972
curves_calculate_curve (CurvesDialog *cd)
{
  int i;
  int points[17];
  int num_pts;
  int p1, p2, p3, p4;

  switch (cd->curve_type)
    {
    case GFREE:
      break;
    case SMOOTH:
      /*  cycle through the curves  */
      num_pts = 0;
      for (i = 0; i < 17; i++)
	if (cd->points[cd->channel][i][0] != -1)
	  points[num_pts++] = i;

      /*  Initialize boundary curve points */
      if (num_pts != 0)
	{
	  for (i = 0; i < cd->points[cd->channel][points[0]][0]; i++)
	    cd->curve[cd->channel][i] = cd->points[cd->channel][points[0]][1];
	  for (i = cd->points[cd->channel][points[num_pts - 1]][0]; i < 256; i++)
	    cd->curve[cd->channel][i] = cd->points[cd->channel][points[num_pts - 1]][1];
	}

      for (i = 0; i < num_pts - 1; i++)
	{
	  p1 = (i == 0) ? points[i] : points[(i - 1)];
	  p2 = points[i];
	  p3 = points[(i + 1)];
	  p4 = (i == (num_pts - 2)) ? points[(num_pts - 1)] : points[(i + 2)];

	  curves_plot_curve (cd, p1, p2, p3, p4);
	}
      break;
    }
973 974 975
  gimp_lut_setup(cd->lut, (GimpLutFunc) curves_lut_func,
		 (void *) cd, gimp_drawable_bytes(cd->drawable));

Elliot Lee's avatar
Elliot Lee committed
976 977 978 979 980 981
}

static void
curves_preview (CurvesDialog *cd)
{
  if (!cd->image_map)
982
    g_message ("curves_preview(): No image map");
983 984 985

  active_tool->preserve = TRUE;  /* Going to dirty the display... */

986 987
  image_map_apply (cd->image_map,  (ImageMapApplyFunc)gimp_lut_process_2,
		   (void *) cd->lut);
988 989

  active_tool->preserve = FALSE;  /* All done */
Elliot Lee's avatar
Elliot Lee committed
990 991 992 993 994 995 996 997 998 999 1000 1001 1002
}

static void
curves_value_callback (GtkWidget *w,
		       gpointer   client_data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) client_data;

  if (cd->channel != HISTOGRAM_VALUE)
    {
      cd->channel = HISTOGRAM_VALUE;
1003
      curves_update (cd, XRANGE_TOP | YRANGE | GRAPH | DRAW);
Elliot Lee's avatar
Elliot Lee committed
1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017
    }
}

static void
curves_red_callback (GtkWidget *w,
		     gpointer   client_data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) client_data;

  if (cd->channel != HISTOGRAM_RED)
    {
      cd->channel = HISTOGRAM_RED;
1018
      curves_update (cd, XRANGE_TOP | YRANGE | GRAPH | DRAW);
Elliot Lee's avatar
Elliot Lee committed
1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032
    }
}

static void
curves_green_callback (GtkWidget *w,
		       gpointer   client_data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) client_data;

  if (cd->channel != HISTOGRAM_GREEN)
    {
      cd->channel = HISTOGRAM_GREEN;
1033
      curves_update (cd, XRANGE_TOP | YRANGE | GRAPH | DRAW);
Elliot Lee's avatar
Elliot Lee committed
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047
    }
}

static void
curves_blue_callback (GtkWidget *w,
		      gpointer   client_data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) client_data;

  if (cd->channel != HISTOGRAM_BLUE)
    {
      cd->channel = HISTOGRAM_BLUE;
1048
      curves_update (cd, XRANGE_TOP | YRANGE | GRAPH | DRAW);
Elliot Lee's avatar
Elliot Lee committed
1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062
    }
}

static void
curves_alpha_callback (GtkWidget *w,
		      gpointer   client_data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) client_data;

  if (cd->channel != HISTOGRAM_ALPHA)
    {
      cd->channel = HISTOGRAM_ALPHA;
1063
      curves_update (cd, XRANGE_TOP | YRANGE | GRAPH | DRAW);
Elliot Lee's avatar
Elliot Lee committed
1064 1065 1066 1067 1068 1069 1070 1071
    }
}

static void
curves_smooth_callback (GtkWidget *w,
			gpointer   client_data)
{
  CurvesDialog *cd;
1072 1073
  int i;
  gint32 index;
Elliot Lee's avatar
Elliot Lee committed
1074 1075 1076 1077 1078 1079 1080 1081 1082 1083

  cd = (CurvesDialog *) client_data;

  if (cd->curve_type != SMOOTH)
    {
      cd->curve_type = SMOOTH;

      /*  pick representative points from the curve and make them control points  */
      for (i = 0; i <= 8; i++)
	{
1084
	  index = CLAMP0255 (i * 32);
Elliot Lee's avatar
Elliot Lee committed
1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107
	  cd->points[cd->channel][i * 2][0] = index;
	  cd->points[cd->channel][i * 2][1] = cd->curve[cd->channel][index];
	}

      curves_calculate_curve (cd);
      curves_update (cd, GRAPH | DRAW);

      if (cd->preview)
	curves_preview (cd);
    }
}

static void
curves_free_callback (GtkWidget *w,
		      gpointer   client_data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) client_data;

  if (cd->curve_type != GFREE)
    {
      cd->curve_type = GFREE;
1108
      curves_calculate_curve (cd);
Elliot Lee's avatar
Elliot Lee committed
1109
      curves_update (cd, GRAPH | DRAW);
1110 1111 1112

      if (cd->preview)
	curves_preview (cd);
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
    }
}

static void
curves_reset_callback (GtkWidget *widget,
		       gpointer   client_data)
{
  CurvesDialog *cd;
  int i;

  cd = (CurvesDialog *) client_data;

  /*  Initialize the values  */
  for (i = 0; i < 256; i++)
    cd->curve[cd->channel][i] = i;

  cd->grab_point = -1;
  for (i = 0; i < 17; i++)
    {
      cd->points[cd->channel][i][0] = -1;
      cd->points[cd->channel][i][1] = -1;
    }
  cd->points[cd->channel][0][0] = 0;
  cd->points[cd->channel][0][1] = 0;
  cd->points[cd->channel][16][0] = 255;
  cd->points[cd->channel][16][1] = 255;

1140
  curves_calculate_curve (cd);
Elliot Lee's avatar
Elliot Lee committed
1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156
  curves_update (cd, GRAPH | XRANGE_TOP | DRAW);
  if (cd->preview)
    curves_preview (cd);
}

static void
curves_ok_callback (GtkWidget *widget,
		    gpointer   client_data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) client_data;

  if (GTK_WIDGET_VISIBLE (cd->shell))
    gtk_widget_hide (cd->shell);

1157 1158
  active_tool->preserve = TRUE;  /* We're about to dirty... */

Elliot Lee's avatar
Elliot Lee committed
1159
  if (!cd->preview)
1160 1161
    image_map_apply (cd->image_map, (ImageMapApplyFunc)gimp_lut_process_2,
		     (void *) cd->lut);
Elliot Lee's avatar
Elliot Lee committed
1162 1163 1164 1165

  if (cd->image_map)
    image_map_commit (cd->image_map);

1166 1167
  active_tool->preserve = FALSE;

Elliot Lee's avatar
Elliot Lee committed
1168
  cd->image_map = NULL;
1169 1170 1171

  active_tool->gdisp_ptr = NULL;
  active_tool->drawable = NULL;
Elliot Lee's avatar
Elliot Lee committed
1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185
}

static void
curves_cancel_callback (GtkWidget *widget,
			gpointer   client_data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) client_data;
  if (GTK_WIDGET_VISIBLE (cd->shell))
    gtk_widget_hide (cd->shell);

  if (cd->image_map)
    {
1186
      active_tool->preserve = TRUE;
Elliot Lee's avatar
Elliot Lee committed
1187
      image_map_abort (cd->image_map);
1188
      active_tool->preserve = FALSE;
1189

Elliot Lee's avatar
Elliot Lee committed
1190
      gdisplays_flush ();
1191
      cd->image_map = NULL;
Elliot Lee's avatar
Elliot Lee committed
1192
    }
1193 1194 1195

  active_tool->gdisp_ptr = NULL;
  active_tool->drawable = NULL;
Elliot Lee's avatar
Elliot Lee committed
1196 1197 1198 1199 1200 1201 1202 1203 1204
}

static gint 
curves_delete_callback (GtkWidget *w,
			GdkEvent *e,
			gpointer data) 
{
  curves_cancel_callback (w, data);

1205
  return TRUE;
Elliot Lee's avatar
Elliot Lee committed
1206 1207 1208 1209 1210 1211 1212 1213
}
static void
curves_preview_update (GtkWidget *w,
		       gpointer   data)
{
  CurvesDialog *cd;

  cd = (CurvesDialog *) data;
1214
  
Elliot Lee's avatar
Elliot Lee committed
1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306
  if (GTK_TOGGLE_BUTTON (w)->active)
    {
      cd->preview = TRUE;
      curves_preview (cd);
    }
  else
    cd->preview = FALSE;
}

static gint
curves_graph_events (GtkWidget    *widget,
		     GdkEvent     *event,
		     CurvesDialog *cd)
{
  static GdkCursorType cursor_type = GDK_TOP_LEFT_ARROW;
  GdkCursorType new_type;
  GdkEventButton *bevent;
  GdkEventMotion *mevent;
  int i;
  int tx, ty;
  int x, y;
  int closest_point;
  int distance;
  int x1, x2, y1, y2;

  new_type      = GDK_X_CURSOR;
  closest_point = 0;

  /*  get the pointer position  */
  gdk_window_get_pointer (cd->graph->window, &tx, &ty, NULL);
  x = BOUNDS ((tx - RADIUS), 0, 255);
  y = BOUNDS ((ty - RADIUS), 0, 255);

  distance = G_MAXINT;
  for (i = 0; i < 17; i++)
    {
      if (cd->points[cd->channel][i][0] != -1)
	if (abs (x - cd->points[cd->channel][i][0]) < distance)
	  {
	    distance = abs (x - cd->points[cd->channel][i][0]);
	    closest_point = i;
	  }
    }
  if (distance > MIN_DISTANCE)
    closest_point = (x + 8) / 16;

  switch (event->type)
    {
    case GDK_EXPOSE:
      if (cd->pixmap == NULL)
	cd->pixmap = gdk_pixmap_new (cd->graph->window,
				     GRAPH_WIDTH + RADIUS * 2,
				     GRAPH_HEIGHT + RADIUS * 2, -1);

      curves_update (cd, GRAPH | DRAW);
      break;

    case GDK_BUTTON_PRESS:
      bevent = (GdkEventButton *) event;
      new_type = GDK_TCROSS;

      switch (cd->curve_type)
	{
	case SMOOTH:
	  /*  determine the leftmost and rightmost points  */
	  cd->leftmost = -1;
	  for (i = closest_point - 1; i >= 0; i--)
	    if (cd->points[cd->channel][i][0] != -1)
	      {
		cd->leftmost = cd->points[cd->channel][i][0];
		break;
	      }
	  cd->rightmost = 256;
	  for (i = closest_point + 1; i < 17; i++)
	    if (cd->points[cd->channel][i][0] != -1)
	      {
		cd->rightmost = cd->points[cd->channel][i][0];
		break;
	      }

	  cd->grab_point = closest_point;
	  cd->points[cd->channel][cd->grab_point][0] = x;
	  cd->points[cd->channel][cd->grab_point][1] = 255 - y;

	  break;

	case GFREE:
	  cd->curve[cd->channel][x] = 255 - y;
	  cd->grab_point = x;
	  cd->last = y;
	  break;
	}
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
1307 1308
      
      curves_calculate_curve (cd);
Elliot Lee's avatar
Elliot Lee committed
1309
      curves_update (cd, GRAPH | XRANGE_TOP | DRAW);
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
1310 1311
      gtk_grab_add(widget);

Elliot Lee's avatar
Elliot Lee committed
1312 1313 1314 1315 1316 1317 1318 1319
      break;

    case GDK_BUTTON_RELEASE:
      new_type = GDK_FLEUR;
      cd->grab_point = -1;

      if (cd->preview)
	curves_preview (cd);
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
1320 1321 1322

      gtk_grab_remove(widget);

Elliot Lee's avatar
Elliot Lee committed
1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473
      break;

    case GDK_MOTION_NOTIFY:
      mevent = (GdkEventMotion *) event;

      if (mevent->is_hint)
	{
	  mevent->x = tx;
	  mevent->y = ty;
	}

      switch (cd->curve_type)
	{
	case SMOOTH:
	  /*  If no point is grabbed...  */
	  if (cd->grab_point == -1)
	    {
	      if (cd->points[cd->channel][closest_point][0] != -1)
		new_type = GDK_FLEUR;
	      else
		new_type = GDK_TCROSS;
	    }
	  /*  Else, drag the grabbed point  */
	  else
	    {
	      new_type = GDK_TCROSS;

	      cd->points[cd->channel][cd->grab_point][0] = -1;

	      if (x > cd->leftmost && x < cd->rightmost)
		{
		  closest_point = (x + 8) / 16;
		  if (cd->points[cd->channel][closest_point][0] == -1)
		    cd->grab_point = closest_point;
		  cd->points[cd->channel][cd->grab_point][0] = x;
		  cd->points[cd->channel][cd->grab_point][1] = 255 - y;
		}

	      curves_calculate_curve (cd);
	      curves_update (cd, GRAPH | XRANGE_TOP | DRAW);
	    }
	  break;

	case GFREE:
	  if (cd->grab_point != -1)
	    {
	      if (cd->grab_point > x)
		{
		  x1 = x;
		  x2 = cd->grab_point;
		  y1 = y;
		  y2 = cd->last;
		}
	      else
		{
		  x1 = cd->grab_point;
		  x2 = x;
		  y1 = cd->last;
		  y2 = y;
		}

	      if (x2 != x1)
		for (i = x1; i <= x2; i++)
		  cd->curve[cd->channel][i] = 255 - (y1 + ((y2 - y1) * (i - x1)) / (x2 - x1));
	      else
		cd->curve[cd->channel][x] = 255 - y;

	      cd->grab_point = x;
	      cd->last = y;

	      curves_update (cd, GRAPH | XRANGE_TOP | DRAW);
	    }

	  if (mevent->state & GDK_BUTTON1_MASK)
	    new_type = GDK_TCROSS;
	  else
	    new_type = GDK_PENCIL;
	  break;
	}

      if (new_type != cursor_type)
	{
	  cursor_type = new_type;
	  change_win_cursor (cd->graph->window, cursor_type);
	}
      break;

    default:
      break;
    }

  return FALSE;
}

static gint
curves_xrange_events (GtkWidget    *widget,
		      GdkEvent     *event,
		      CurvesDialog *cd)
{
  switch (event->type)
    {
    case GDK_EXPOSE:
      curves_update (cd, XRANGE_TOP | XRANGE_BOTTOM);
      break;

    case GDK_DELETE:
      break;

    default:
      break;
    }

  return FALSE;
}

static gint
curves_yrange_events (GtkWidget    *widget,
		      GdkEvent     *event,
		      CurvesDialog *cd)
{
  switch (event->type)
    {
    case GDK_EXPOSE:
      curves_update (cd, YRANGE);
      break;

    default:
      break;
    }

  return FALSE;
}

static void
curves_CR_compose (CRMatrix a,
		   CRMatrix b,
		   CRMatrix ab)
{
  int i, j;

  for (i = 0; i < 4; i++)
    {
      for (j = 0; j < 4; j++)
        {
          ab[i][j] = (a[i][0] * b[0][j] +
                      a[i][1] * b[1][j] +
                      a[i][2] * b[2][j] +
                      a[i][3] * b[3][j]);
        }
    }
}