gimpcurvestool.c 42.9 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 22
#include "config.h"

#include <stdio.h>

Sven Neumann's avatar
Sven Neumann committed
23 24 25 26
#include <gtk/gtk.h>

#include "apptypes.h"

Elliot Lee's avatar
Elliot Lee committed
27 28 29 30
#include "appenv.h"
#include "cursorutil.h"
#include "drawable.h"
#include "gdisplay.h"
31
#include "gimphistogram.h"
32
#include "gimpui.h"
Elliot Lee's avatar
Elliot Lee committed
33
#include "curves.h"
34
#include "gimplut.h"
Elliot Lee's avatar
Elliot Lee committed
35

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

39 40
#include "libgimp/gimpintl.h"

41 42 43 44 45 46
#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
47

48 49 50
/*  NB: take care when changing these values: make sure the curve[] array in
 *  curves.h is large enough.
 */
51 52 53 54 55 56
#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
57 58 59 60 61 62 63 64 65 66 67 68 69 70
#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

71
/*  the curves structures  */
Elliot Lee's avatar
Elliot Lee committed
72

73
typedef struct _Curves Curves;
74

Elliot Lee's avatar
Elliot Lee committed
75 76
struct _Curves
{
77
  gint x, y;    /*  coords for last mouse click  */
Elliot Lee's avatar
Elliot Lee committed
78 79
};

80
typedef gdouble CRMatrix[4][4];
81

82
/*  the curves tool options  */
83
static ToolOptions  * curves_options = NULL;
84 85

/*  the curves dialog  */
86
static CurvesDialog * curves_dialog = NULL;
87

88 89 90 91
/*  the curves file dialog  */
static GtkWidget *file_dlg = NULL;
static gboolean   load_save;

92 93
static GtkWidget *channel_items[5];

94 95 96 97 98 99 100 101
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
102

103
/*  curves action functions  */
Michael Natterer's avatar
Michael Natterer committed
104

Elliot Lee's avatar
Elliot Lee committed
105 106 107
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
108 109
static void   curves_control        (Tool *, ToolAction,       gpointer);

110
static CurvesDialog * curves_dialog_new (void);
111

112 113 114 115 116 117
static void   curves_update           (CurvesDialog *, int);
static void   curves_plot_curve       (CurvesDialog *, int, int, int, int);
static void   curves_preview          (CurvesDialog *);

static void   curves_channel_callback (GtkWidget *, gpointer);

118 119
static void   curves_smooth_callback      (GtkWidget *, gpointer);
static void   curves_free_callback        (GtkWidget *, gpointer);
120

121
static void   curves_channel_reset        (int);
122 123 124 125 126 127 128 129 130 131
static void   curves_reset_callback       (GtkWidget *, gpointer);
static void   curves_ok_callback          (GtkWidget *, gpointer);
static void   curves_cancel_callback      (GtkWidget *, gpointer);
static void   curves_load_callback        (GtkWidget *, gpointer);
static void   curves_save_callback        (GtkWidget *, 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);
132

133 134 135
static void   file_dialog_create          (GtkWidget *);
static void   file_dialog_ok_callback     (GtkWidget *, gpointer);
static void   file_dialog_cancel_callback (GtkWidget *, gpointer);
136

137 138
static gboolean  curves_read_from_file    (FILE *f);
static void      curves_write_to_file     (FILE *f);
139 140


Elliot Lee's avatar
Elliot Lee committed
141 142
/*  curves machinery  */

143
gfloat
Manish Singh's avatar
Manish Singh committed
144
curves_lut_func (CurvesDialog *cd,
145 146 147
		 gint          nchannels,
		 gint          channel,
		 gfloat        value)
Elliot Lee's avatar
Elliot Lee committed
148
{
149 150 151 152
  gfloat f;
  gint index;
  gdouble inten;
  gint j;
Elliot Lee's avatar
Elliot Lee committed
153

154 155 156 157
  if (nchannels == 1)
    j = 0;
  else
    j = channel + 1;
158

159
  inten = value;
160

Manish Singh's avatar
Manish Singh committed
161
  /* For color images this runs through the loop with j = channel +1
162 163 164 165 166 167 168 169 170 171 172 173 174 175 176
     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
177
    {
178 179 180 181
      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
182
    }
183 184
  }
  return inten;
Elliot Lee's avatar
Elliot Lee committed
185 186
}

BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
187
static void
Michael Natterer's avatar
Michael Natterer committed
188 189 190 191 192
curves_colour_update (Tool           *tool,
		      GDisplay       *gdisp,
		      GimpDrawable   *drawable,
		      gint            x,
		      gint            y)
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
193
{
194 195 196 197 198 199 200
  guchar *color;
  gint    offx;
  gint    offy;
  gint    maxval;
  gboolean       has_alpha;
  gboolean       is_indexed;
  GimpImageType  sample_type;
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
201 202 203 204 205 206 207 208 209 210 211 212

  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;

213
  sample_type = gimp_drawable_type (drawable);
214 215
  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
216 217 218 219 220 221 222 223 224 225 226 227 228

  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];

229 230
  maxval = MAX (color[RED_PIX], color[GREEN_PIX]);
  curves_dialog->col_value[HISTOGRAM_VALUE] = MAX (maxval, color[BLUE_PIX]);
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
231

232
  g_free (color);
233
}
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
234

235
static void
236 237 238 239
curves_add_point (GimpDrawable *drawable,
		  gint          x,
		  gint          y,
		  gint          cchan)
240 241
{
  /* Add point onto the curve */
242 243 244 245
  gint closest_point = 0;
  gint distance;
  gint curvex;
  gint i;
246

247
  switch (curves_dialog->curve_type[cchan])
248
    {
249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271
    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;
272
    }
Elliot Lee's avatar
Elliot Lee committed
273 274
}

275 276 277 278 279 280 281 282
/*  curves action functions  */

static void
curves_button_press (Tool           *tool,
		     GdkEventButton *bevent,
		     gpointer        gdisp_ptr)
{
  gint x, y;
283 284
  GDisplay     *gdisp;
  GimpDrawable *drawable;
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

  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
312 313 314 315 316
static void
curves_button_release (Tool           *tool,
		       GdkEventButton *bevent,
		       gpointer        gdisp_ptr)
{
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
317
  gint x, y;
318 319
  GimpDrawable *drawable;
  GDisplay     *gdisp;
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
320 321 322 323 324 325 326 327 328

  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);
329
  curves_colour_update (tool, gdisp, drawable, x, y);
330

331
  if (bevent->state & GDK_SHIFT_MASK)
332
    {
333 334
      curves_add_point (drawable, x, y, curves_dialog->channel);
      curves_calculate_curve (curves_dialog);
335
    }
336
  else if (bevent->state & GDK_CONTROL_MASK)
337
    {
338 339 340 341 342 343
      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);
344 345 346
    }

  curves_update (curves_dialog, GRAPH | DRAW);
Elliot Lee's avatar
Elliot Lee committed
347 348 349 350 351 352 353
}

static void
curves_motion (Tool           *tool,
	       GdkEventMotion *mevent,
	       gpointer        gdisp_ptr)
{
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
354
  gint x, y;
355 356
  GDisplay     *gdisp;
  GimpDrawable *drawable;
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
357 358 359 360 361 362 363 364 365

  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);
366
  curves_colour_update (tool, gdisp, drawable, x, y);
367
  curves_update (curves_dialog, GRAPH | DRAW);
Elliot Lee's avatar
Elliot Lee committed
368 369 370
}

static void
Michael Natterer's avatar
Michael Natterer committed
371 372 373
curves_control (Tool       *tool,
		ToolAction  action,
		gpointer    gdisp_ptr)
Elliot Lee's avatar
Elliot Lee committed
374 375 376
{
  switch (action)
    {
377
    case PAUSE:
Elliot Lee's avatar
Elliot Lee committed
378
      break;
Michael Natterer's avatar
Michael Natterer committed
379

380
    case RESUME:
Elliot Lee's avatar
Elliot Lee committed
381
      break;
Michael Natterer's avatar
Michael Natterer committed
382

383
    case HALT:
384
      curves_dialog_hide ();
Elliot Lee's avatar
Elliot Lee committed
385
      break;
Michael Natterer's avatar
Michael Natterer committed
386 387 388

    default:
      break;
Elliot Lee's avatar
Elliot Lee committed
389 390 391 392
    }
}

Tool *
393
tools_new_curves (void)
Elliot Lee's avatar
Elliot Lee committed
394
{
395 396
  Tool   *tool;
  Curves *private;
Elliot Lee's avatar
Elliot Lee committed
397 398 399

  /*  The tool options  */
  if (!curves_options)
400
    {
401
      curves_options = tool_options_new (_("Curves"));
402
      tools_register (CURVES, curves_options);
403
    }
Elliot Lee's avatar
Elliot Lee committed
404

405
  tool = tools_new_tool (CURVES);
406
  private = g_new0 (Curves, 1);
Elliot Lee's avatar
Elliot Lee committed
407

408 409
  tool->scroll_lock = TRUE;   /*  Disallow scrolling  */
  tool->preserve    = FALSE;  /*  Don't preserve on drawable change  */
410

411
  tool->private = (void *) private;
412

413
  tool->button_press_func   = curves_button_press;
Elliot Lee's avatar
Elliot Lee committed
414
  tool->button_release_func = curves_button_release;
415 416
  tool->motion_func         = curves_motion;
  tool->control_func        = curves_control;
417

Elliot Lee's avatar
Elliot Lee committed
418 419 420
  return tool;
}

421 422 423 424 425 426 427
void
curves_dialog_hide (void)
{
  if (curves_dialog)
    curves_cancel_callback (NULL, (gpointer) curves_dialog);
}

Elliot Lee's avatar
Elliot Lee committed
428 429 430
void
tools_free_curves (Tool *tool)
{
431
  Curves *private;
Elliot Lee's avatar
Elliot Lee committed
432

433
  private = (Curves *) tool->private;
Elliot Lee's avatar
Elliot Lee committed
434 435

  /*  Close the color select dialog  */
436
  curves_dialog_hide ();
Elliot Lee's avatar
Elliot Lee committed
437

438
  g_free (private);
Elliot Lee's avatar
Elliot Lee committed
439 440 441
}

void
442
curves_initialize (GDisplay *gdisp)
Elliot Lee's avatar
Elliot Lee committed
443
{
444
  gint i, j;
Elliot Lee's avatar
Elliot Lee committed
445 446 447

  if (drawable_indexed (gimage_active_drawable (gdisp->gimage)))
    {
448
      g_message (_("Curves for indexed drawables cannot be adjusted."));
Elliot Lee's avatar
Elliot Lee committed
449 450 451 452 453
      return;
    }

  /*  The curves dialog  */
  if (!curves_dialog)
454 455
    {
      curves_dialog = curves_dialog_new ();
Elliot Lee's avatar
Elliot Lee committed
456

457 458 459 460 461
      /*  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;
Elliot Lee's avatar
Elliot Lee committed
462

463 464 465 466
      for (i = 0; i < 5; i++)
        {
	    curves_channel_reset (i);
        }
Elliot Lee's avatar
Elliot Lee committed
467 468
    }

469 470
  curves_dialog->drawable  = gimage_active_drawable (gdisp->gimage);
  curves_dialog->color     = drawable_color (curves_dialog->drawable);
471
  curves_dialog->image_map = image_map_create (gdisp, curves_dialog->drawable);
Elliot Lee's avatar
Elliot Lee committed
472 473

  /* check for alpha channel */
474
  if (drawable_has_alpha (curves_dialog->drawable))
475
    gtk_widget_set_sensitive (channel_items[4], TRUE);
Elliot Lee's avatar
Elliot Lee committed
476
  else 
477
    gtk_widget_set_sensitive (channel_items[4], FALSE);
Elliot Lee's avatar
Elliot Lee committed
478 479 480 481
  
  /*  hide or show the channel menu based on image type  */
  if (curves_dialog->color)
    for (i = 0; i < 4; i++) 
482
       gtk_widget_set_sensitive (channel_items[i], TRUE);
Elliot Lee's avatar
Elliot Lee committed
483 484
  else 
    for (i = 1; i < 4; i++) 
485
      gtk_widget_set_sensitive (channel_items[i], FALSE);
Elliot Lee's avatar
Elliot Lee committed
486 487

  /* set the current selection */
488 489
  gtk_option_menu_set_history (GTK_OPTION_MENU (curves_dialog->channel_menu),
			       curves_dialog->channel);
Elliot Lee's avatar
Elliot Lee committed
490

491 492 493 494
  gimp_lut_setup (curves_dialog->lut, 
		  (GimpLutFunc) curves_lut_func,
                  (void *) curves_dialog, 
		  gimp_drawable_bytes (curves_dialog->drawable));
495

496 497
  if (!GTK_WIDGET_VISIBLE (curves_dialog->shell))
    gtk_widget_show (curves_dialog->shell);
Elliot Lee's avatar
Elliot Lee committed
498 499

  curves_update (curves_dialog, GRAPH | DRAW);
500 501 502

  if (curves_dialog->preview)
    curves_preview (curves_dialog);
Elliot Lee's avatar
Elliot Lee committed
503 504 505
}

void
506
curves_free (void)
Elliot Lee's avatar
Elliot Lee committed
507 508 509 510 511
{
  if (curves_dialog)
    {
      if (curves_dialog->image_map)
	{
512
	  active_tool->preserve = TRUE;
Elliot Lee's avatar
Elliot Lee committed
513
	  image_map_abort (curves_dialog->image_map);
514
	  active_tool->preserve = FALSE;
515

Elliot Lee's avatar
Elliot Lee committed
516 517
	  curves_dialog->image_map = NULL;
	}
518

Elliot Lee's avatar
Elliot Lee committed
519
      if (curves_dialog->pixmap)
520
	gdk_pixmap_unref (curves_dialog->pixmap);
521

Elliot Lee's avatar
Elliot Lee committed
522 523 524 525
      gtk_widget_destroy (curves_dialog->shell);
    }
}

526 527 528
/*******************/
/*  Curves dialog  */
/*******************/
Elliot Lee's avatar
Elliot Lee committed
529

530
static CurvesDialog *
531
curves_dialog_new (void)
Elliot Lee's avatar
Elliot Lee committed
532 533 534 535
{
  CurvesDialog *cd;
  GtkWidget *vbox;
  GtkWidget *hbox;
536
  GtkWidget *hbbox;
Elliot Lee's avatar
Elliot Lee committed
537 538 539 540 541
  GtkWidget *label;
  GtkWidget *frame;
  GtkWidget *toggle;
  GtkWidget *channel_hbox;
  GtkWidget *table;
542
  GtkWidget *button;
543
  gint i, j;
544

545
  cd = g_new (CurvesDialog, 1);
546 547 548 549 550
  cd->cursor_ind_height = -1;
  cd->cursor_ind_width  = -1;
  cd->preview           = TRUE;
  cd->pixmap            = NULL;
  cd->channel           = HISTOGRAM_VALUE;
551 552 553 554

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

555 556 557
  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
558

559
  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
560 561
    cd->col_value[i] = 0;

562
  cd->lut = gimp_lut_new ();
Elliot Lee's avatar
Elliot Lee committed
563 564

  /*  The shell and main vbox  */
565
  cd->shell = gimp_dialog_new (_("Curves"), "curves",
566
			       tools_help_func, tool_info[CURVES].private_tip,
567 568 569 570
			       GTK_WIN_POS_NONE,
			       FALSE, TRUE, FALSE,

			       _("OK"), curves_ok_callback,
571
			       cd, NULL, NULL, TRUE, FALSE,
572
			       _("Reset"), curves_reset_callback,
573
			       cd, NULL, NULL, FALSE, FALSE,
574
			       _("Cancel"), curves_cancel_callback,
575
			       cd, NULL, NULL, FALSE, TRUE,
576 577

			       NULL);
Elliot Lee's avatar
Elliot Lee committed
578

579 580
  vbox = gtk_vbox_new (FALSE, 4);
  gtk_container_set_border_width (GTK_CONTAINER (vbox), 4);
581
  gtk_container_add (GTK_CONTAINER (GTK_DIALOG (cd->shell)->vbox), vbox);
Elliot Lee's avatar
Elliot Lee committed
582 583

  /*  The option menu for selecting channels  */
584
  channel_hbox = gtk_hbox_new (FALSE, 4);
Elliot Lee's avatar
Elliot Lee committed
585 586
  gtk_box_pack_start (GTK_BOX (vbox), channel_hbox, FALSE, FALSE, 0);

587
  label = gtk_label_new (_("Modify Curves for Channel:"));
Elliot Lee's avatar
Elliot Lee committed
588 589
  gtk_box_pack_start (GTK_BOX (channel_hbox), label, FALSE, FALSE, 0);

590 591 592 593 594 595 596 597 598 599 600 601
  cd->channel_menu = gimp_option_menu_new2
    (FALSE, curves_channel_callback,
     cd, (gpointer) cd->channel,

     _("Value"), (gpointer) HISTOGRAM_VALUE, &channel_items[0],
     _("Red"),   (gpointer) HISTOGRAM_RED,   &channel_items[1],
     _("Green"), (gpointer) HISTOGRAM_GREEN, &channel_items[2],
     _("Blue"),  (gpointer) HISTOGRAM_BLUE,  &channel_items[3],
     _("Alpha"), (gpointer) HISTOGRAM_ALPHA, &channel_items[4],

     NULL);

Elliot Lee's avatar
Elliot Lee committed
602 603 604 605 606 607 608 609
  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);
610 611
  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
612 613 614 615 616 617 618 619
  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);

620
  cd->yrange = gtk_preview_new (GTK_PREVIEW_COLOR);
Elliot Lee's avatar
Elliot Lee committed
621 622
  gtk_preview_size (GTK_PREVIEW (cd->yrange), YRANGE_WIDTH, YRANGE_HEIGHT);
  gtk_widget_set_events (cd->yrange, RANGE_MASK);
623 624
  gtk_container_add (GTK_CONTAINER (frame), cd->yrange);

Elliot Lee's avatar
Elliot Lee committed
625
  gtk_signal_connect (GTK_OBJECT (cd->yrange), "event",
626
		      GTK_SIGNAL_FUNC (curves_yrange_events),
Elliot Lee's avatar
Elliot Lee committed
627
		      cd);
628

Elliot Lee's avatar
Elliot Lee committed
629 630 631 632 633 634 635
  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,
636 637
		    GTK_SHRINK | GTK_FILL,
		    GTK_SHRINK | GTK_FILL, 0, 0);
Elliot Lee's avatar
Elliot Lee committed
638 639 640 641 642 643

  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);
644 645
  gtk_container_add (GTK_CONTAINER (frame), cd->graph);

Elliot Lee's avatar
Elliot Lee committed
646
  gtk_signal_connect (GTK_OBJECT (cd->graph), "event",
647
		      GTK_SIGNAL_FUNC (curves_graph_events),
Elliot Lee's avatar
Elliot Lee committed
648
		      cd);
649

Elliot Lee's avatar
Elliot Lee committed
650 651 652 653 654 655 656 657 658
  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);

659
  cd->xrange = gtk_preview_new (GTK_PREVIEW_COLOR);
Elliot Lee's avatar
Elliot Lee committed
660 661
  gtk_preview_size (GTK_PREVIEW (cd->xrange), XRANGE_WIDTH, XRANGE_HEIGHT);
  gtk_widget_set_events (cd->xrange, RANGE_MASK);
662 663
  gtk_container_add (GTK_CONTAINER (frame), cd->xrange);

Elliot Lee's avatar
Elliot Lee committed
664
  gtk_signal_connect (GTK_OBJECT (cd->xrange), "event",
665
		      GTK_SIGNAL_FUNC (curves_xrange_events),
Elliot Lee's avatar
Elliot Lee committed
666
		      cd);
667

Elliot Lee's avatar
Elliot Lee committed
668 669 670 671 672
  gtk_widget_show (cd->xrange);
  gtk_widget_show (frame);
  gtk_widget_show (table);

  /*  Horizontal box for preview  */
673
  hbox = gtk_hbox_new (FALSE, 4);
674
  gtk_box_pack_end (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
Elliot Lee's avatar
Elliot Lee committed
675 676

  /*  The option menu for selecting the drawing method  */
677
  label = gtk_label_new (_("Curve Type:"));
Elliot Lee's avatar
Elliot Lee committed
678
  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
679
  gtk_widget_show (label);
Elliot Lee's avatar
Elliot Lee committed
680

681 682
  cd->curve_type_menu = gimp_option_menu_new
    (FALSE,
Elliot Lee's avatar
Elliot Lee committed
683

684 685 686 687 688
     _("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);
689
  gtk_widget_show (cd->curve_type_menu);
690

Elliot Lee's avatar
Elliot Lee committed
691 692 693
  gtk_widget_show (hbox);

  /*  The preview toggle  */
694
  toggle = gtk_check_button_new_with_label (_("Preview"));
695
  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), cd->preview);
696 697
  gtk_box_pack_end (GTK_BOX (hbox), toggle, FALSE, FALSE, 0);

Elliot Lee's avatar
Elliot Lee committed
698
  gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
699
		      GTK_SIGNAL_FUNC (curves_preview_update),
Elliot Lee's avatar
Elliot Lee committed
700 701 702 703 704
		      cd);

  gtk_widget_show (toggle);
  gtk_widget_show (hbox);

705 706 707 708 709 710 711 712 713 714 715
  /*  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_signal_connect (GTK_OBJECT (button), "clicked",
		      GTK_SIGNAL_FUNC (curves_load_callback),
716
		      cd->shell);
717 718 719 720 721 722 723
  gtk_widget_show (button);

  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_signal_connect (GTK_OBJECT (button), "clicked",
		      GTK_SIGNAL_FUNC (curves_save_callback),
724
		      cd->shell);
725 726 727
  gtk_widget_show (button);

  gtk_widget_show (hbbox);
Elliot Lee's avatar
Elliot Lee committed
728 729 730 731 732
  gtk_widget_show (vbox);

  return cd;
}

733
static void
734 735 736
curve_print_loc (CurvesDialog *cd,
		 gint          xpos,
		 gint          ypos)
737
{
738 739 740 741
  gchar buf[32];
  gint  width;
  gint  ascent;
  gint  descent;
742

743
  if (cd->cursor_ind_width < 0)
744 745
    {
      /* Calc max extents */
746 747 748 749 750 751 752
      gdk_string_extents (cd->graph->style->font,
			  "x:888 y:888",
			  NULL,
			  NULL,
			  &width,
			  &ascent,
			  &descent);
753 754 755 756 757 758
	
      cd->cursor_ind_width = width;
      cd->cursor_ind_height = ascent + descent;
      cd->cursor_ind_ascent = ascent;
    }
  
759
  if (xpos >= 0 && xpos <= 255 && ypos >=0 && ypos <= 255)
760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783
    {
      g_snprintf (buf, sizeof (buf), "x:%d y:%d",xpos,ypos);

      gdk_draw_rectangle (cd->graph->window, 
			  cd->graph->style->bg_gc[GTK_STATE_ACTIVE],
			  TRUE, RADIUS*2 + 2 , RADIUS*2 + 2, 
			  cd->cursor_ind_width+4, 
			  cd->cursor_ind_height+5);

      gdk_draw_rectangle (cd->graph->window, 
			  cd->graph->style->black_gc,
			  FALSE, RADIUS*2 + 2 , RADIUS*2 + 2, 
			  cd->cursor_ind_width+3, 
			  cd->cursor_ind_height+4);

      gdk_draw_string (cd->graph->window,
		       cd->graph->style->font,
		       cd->graph->style->black_gc,
		       RADIUS*2 + 4,
		       RADIUS*2 + 5 + cd->cursor_ind_ascent,
		       buf);
    }
}

784
/* TODO: preview alpha channel stuff correctly.  -- austin, 20/May/99 */
Elliot Lee's avatar
Elliot Lee committed
785 786
static void
curves_update (CurvesDialog *cd,
787
	       gint          update)
Elliot Lee's avatar
Elliot Lee committed
788 789
{
  GdkRectangle area;
790 791 792
  gint   i, j;
  gchar  buf[32];
  gint   offset;
793 794 795 796 797 798 799 800 801 802 803
  gint   sel_channel;
  
  if(cd->color) {
    sel_channel = cd->channel;
  } else {
    if(cd->channel == 2)
      sel_channel = HISTOGRAM_ALPHA;
    else
      sel_channel = HISTOGRAM_VALUE;
  }

Elliot Lee's avatar
Elliot Lee committed
804 805 806

  if (update & XRANGE_TOP)
    {
807
      guchar buf[XRANGE_WIDTH * 3];
808

809
      switch (sel_channel)
810 811 812
	{
	case HISTOGRAM_VALUE:
	case HISTOGRAM_ALPHA:
813
	  for (i = 0; i < XRANGE_HEIGHT / 2; i++)
814
	    {
815
	      for (j = 0; j < XRANGE_WIDTH ; j++)
816
		{
817 818 819
		  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];
820
		}
821 822
	      gtk_preview_draw_row (GTK_PREVIEW (cd->xrange),
				    buf, 0, i, XRANGE_WIDTH);
823
	    }
824 825
	  break;

826 827 828
	case HISTOGRAM_RED:
	case HISTOGRAM_GREEN:
	case HISTOGRAM_BLUE:
829
	  {
830
	    for (i = 0; i < XRANGE_HEIGHT / 2; i++)
831
	      {
832 833 834 835 836 837 838 839
		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);
840
	      }
841
	    break;
842 843
	  }

844
	default:
845 846 847
	  g_warning ("unknown channel type %d, can't happen!?!?",
		     cd->channel);
	  break;
848
	}
Elliot Lee's avatar
Elliot Lee committed
849 850 851 852 853 854 855 856 857 858 859 860

      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)
    {
861
      guchar buf[XRANGE_WIDTH * 3];
Elliot Lee's avatar
Elliot Lee committed
862 863

      for (i = 0; i < XRANGE_WIDTH; i++)
864 865 866 867 868
      {
	buf[i*3+0] = i;
	buf[i*3+1] = i;
	buf[i*3+2] = i;
      }
Elliot Lee's avatar
Elliot Lee committed
869 870 871 872 873 874 875 876 877 878 879 880 881 882 883

      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)
    {
884 885
      guchar buf[YRANGE_WIDTH * 3];
      guchar pix[3];
Elliot Lee's avatar
Elliot Lee committed
886 887 888

      for (i = 0; i < YRANGE_HEIGHT; i++)
	{
889
	  switch (sel_channel)
890 891 892
	    {
	    case HISTOGRAM_VALUE:
	    case HISTOGRAM_ALPHA:
893 894 895
	      pix[0] = pix[1] = pix[2] = (255 - i);
	      break;

896 897 898
	    case HISTOGRAM_RED:
	    case HISTOGRAM_GREEN:
	    case HISTOGRAM_BLUE:
899
	      pix[0] = pix[1] = pix[2] = 0;
900
	      pix[sel_channel - 1] = (255 - i);
901 902
	      break;

903
	    default:
904 905 906
	      g_warning ("unknown channel type %d, can't happen!?!?",
			 cd->channel);
	      break;
907
	    }
908 909

	  for (j = 0; j < YRANGE_WIDTH * 3; j++)
910
	    buf[j] = pix[j%3];
Elliot Lee's avatar
Elliot Lee committed
911

912 913
	  gtk_preview_draw_row (GTK_PREVIEW (cd->yrange),
				buf, 0, i, YRANGE_WIDTH);
Elliot Lee's avatar
Elliot Lee committed
914 915 916 917 918 919 920 921 922 923 924
	}

      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],
925 926
			  TRUE, 0, 0,
			  GRAPH_WIDTH + RADIUS * 2, GRAPH_HEIGHT + RADIUS * 2);
Elliot Lee's avatar
Elliot Lee committed
927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947

      /*  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  */
948
      if (cd->curve_type[cd->channel] == SMOOTH)
Elliot Lee's avatar
Elliot Lee committed
949 950 951 952 953 954 955 956 957
	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
958
      /* draw the colour line */
959
      gdk_draw_line (cd->pixmap, cd->graph->style->black_gc,
960 961
		     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
962

963
      /* and xpos indicator */
964
      g_snprintf (buf, sizeof (buf), "x:%d",cd->col_value[sel_channel]);
965
      
966
      if ((cd->col_value[sel_channel]+RADIUS) < 127)
967 968 969 970 971
	{
	  offset = RADIUS + 4;
	}
      else
	{
972
	  offset = - gdk_string_width (cd->graph->style->font,buf) - 2;
973 974 975 976 977
	}

      gdk_draw_string (cd->pixmap,
		       cd->graph->style->font,
		       cd->graph->style->black_gc,
978
		       cd->col_value[sel_channel]+offset,
979 980 981
		       GRAPH_HEIGHT,
		       buf);

Elliot Lee's avatar
Elliot Lee committed
982 983
      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);
984
      
Elliot Lee's avatar
Elliot Lee committed
985 986 987 988 989
    }
}

static void
curves_plot_curve (CurvesDialog *cd,
990 991 992 993
		   gint          p1,
		   gint          p2,
		   gint          p3,
		   gint          p4)
Elliot Lee's avatar
Elliot Lee committed
994 995 996 997
{
  CRMatrix geometry;
  CRMatrix tmp1, tmp2;
  CRMatrix deltas;
998 999 1000 1001 1002 1003
  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
1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049

  /* 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