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gimp/app/curves.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "appenv.h"
#include "actionarea.h"
#include "buildmenu.h"
#include "colormaps.h"
#include "cursorutil.h"
#include "drawable.h"
#include "general.h"
#include "gdisplay.h"
#include "gimphistogram.h"
#include "interface.h"
#include "curves.h"
#include "gimplut.h"
#include "libgimp/gimpintl.h"
#define ROUND(x) ((int) ((x) + 0.5))
#define GRAPH 0x1
#define XRANGE_TOP 0x2
#define XRANGE_BOTTOM 0x4
#define YRANGE 0x8
#define DRAW 0x10
#define ALL 0xFF
#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
/* the curves structures */
typedef struct _Curves Curves;
struct _Curves
{
int x, y; /* coords for last mouse click */
};
typedef double CRMatrix[4][4];
/* the curves tool options */
static ToolOptions * curves_options = NULL;
/* the curves dialog */
static CurvesDialog * curves_dialog = NULL;
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 },
};
/* curves action functions */
static void curves_button_press (Tool *, GdkEventButton *, gpointer);
static void curves_button_release (Tool *, GdkEventButton *, gpointer);
static void curves_motion (Tool *, GdkEventMotion *, gpointer);
static void curves_cursor_update (Tool *, GdkEventMotion *, gpointer);
static void curves_control (Tool *, int, gpointer);
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);
/* curves machinery */
float
curves_lut_func (CurvesDialog *cd,
int nchannels, int channel, float value)
{
float f;
int index;
double inten;
int j;
if (nchannels == 1)
j = 0;
else
j = channel + 1;
inten = value;
/* For color images this runs through the loop with j = channel +1
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 */
{
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;
}
}
return inten;
}
/* curves action functions */
static void
curves_button_press (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
GimpDrawable * drawable;
gdisp = gdisp_ptr;
drawable = gimage_active_drawable (gdisp->gimage);
if(drawable != tool->drawable)
{
active_tool->preserve = TRUE;
image_map_abort (curves_dialog->image_map);
active_tool->preserve = FALSE;
curves_dialog->drawable = tool->drawable = drawable;
curves_dialog->color = drawable_color (drawable);
curves_dialog->image_map = image_map_create (gdisp, drawable);
}
if(tool)
tool->state = ACTIVE;
}
static void
curves_colour_update(Tool *tool,
GDisplay *gdisp,
GimpDrawable *drawable,
gint x,
gint y)
{
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);
curves_update (curves_dialog, GRAPH | DRAW);
}
static void
curves_button_release (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
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);
}
static void
curves_motion (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
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);
}
static void
curves_cursor_update (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
gdisp = (GDisplay *) gdisp_ptr;
gdisplay_install_tool_cursor (gdisp, GDK_TOP_LEFT_ARROW);
}
static void
curves_control (Tool *tool,
int action,
gpointer gdisp_ptr)
{
Curves * _curves;
_curves = (Curves *) tool->private;
switch (action)
{
case PAUSE :
break;
case RESUME :
break;
case HALT :
if (curves_dialog)
{
active_tool->preserve = TRUE;
image_map_abort (curves_dialog->image_map);
active_tool->preserve = FALSE;
curves_dialog->image_map = NULL;
curves_cancel_callback (NULL, (gpointer) curves_dialog);
}
break;
}
}
Tool *
tools_new_curves ()
{
Tool * tool;
Curves * private;
/* The tool options */
if (!curves_options)
{
curves_options = tool_options_new (_("Curves Options"));
tools_register (CURVES, curves_options);
}
tool = (Tool *) g_malloc (sizeof (Tool));
private = (Curves *) g_malloc (sizeof (Curves));
tool->type = CURVES;
tool->state = INACTIVE;
tool->scroll_lock = 1; /* Disallow scrolling */
tool->auto_snap_to = TRUE;
tool->private = (void *) private;
tool->button_press_func = curves_button_press;
tool->button_release_func = curves_button_release;
tool->motion_func = curves_motion;
tool->arrow_keys_func = standard_arrow_keys_func; tool->modifier_key_func = standard_modifier_key_func;
tool->cursor_update_func = curves_cursor_update;
tool->control_func = curves_control;
tool->preserve = TRUE;
tool->gdisp_ptr = NULL;
tool->drawable = NULL;
return tool;
}
void
tools_free_curves (Tool *tool)
{
Curves * _curves;
_curves = (Curves *) tool->private;
/* Close the color select dialog */
if (curves_dialog)
curves_cancel_callback (NULL, (gpointer) curves_dialog);
g_free (_curves);
}
/* the action area structure */
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 channel_items[] =
{
{ 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 },
{ NULL, 0, 0, NULL, NULL, 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 }
};
void
curves_initialize (GDisplay *gdisp)
{
int i, j;
if (drawable_indexed (gimage_active_drawable (gdisp->gimage)))
{
g_message (_("Curves for indexed drawables cannot be adjusted."));
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;
}
curves_dialog->drawable = gimage_active_drawable (gdisp->gimage);
curves_dialog->color = drawable_color ( (curves_dialog->drawable));
curves_dialog->image_map = image_map_create (gdisp, curves_dialog->drawable);
/* check for alpha channel */
if (drawable_has_alpha ( (curves_dialog->drawable)))
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 */
gtk_option_menu_set_history ( GTK_OPTION_MENU (curves_dialog->channel_menu), 0);
if (!GTK_WIDGET_VISIBLE (curves_dialog->shell))
gtk_widget_show (curves_dialog->shell);
curves_update (curves_dialog, GRAPH | DRAW);
}
void
curves_free ()
{
if (curves_dialog)
{
if (curves_dialog->image_map)
{
active_tool->preserve = TRUE;
image_map_abort (curves_dialog->image_map);
active_tool->preserve = FALSE;
curves_dialog->image_map = NULL;
}
if (curves_dialog->pixmap)
gdk_pixmap_unref (curves_dialog->pixmap);
gtk_widget_destroy (curves_dialog->shell);
}
}
/**************************/
/* Select Curves dialog */
/**************************/
static CurvesDialog *
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;
int i, j;
cd = g_malloc (sizeof (CurvesDialog));
cd->preview = TRUE;
cd->curve_type = SMOOTH;
cd->pixmap = NULL;
cd->channel = HISTOGRAM_VALUE;
for (i = 0; i < 5; i++)
for (j = 0; j < 256; j++)
cd->curve[i][j] = j;
for(i = 0; i < (sizeof(cd->col_value)/sizeof(cd->col_value[0])); i++)
cd->col_value[i] = 0;
cd->lut = gimp_lut_new();
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 ();
gtk_window_set_wmclass (GTK_WINDOW (cd->shell), "curves", "Gimp");
gtk_window_set_title (GTK_WINDOW (cd->shell), _("Curves"));
gtk_signal_connect (GTK_OBJECT (cd->shell), "delete_event",
GTK_SIGNAL_FUNC (curves_delete_callback),
cd);
vbox = gtk_vbox_new (FALSE, 2);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 2);
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);
label = gtk_label_new (_("Modify Curves for Channel: "));
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);
gtk_container_set_border_width (GTK_CONTAINER (table), 2);
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);
cd->yrange = gtk_preview_new (GTK_PREVIEW_GRAYSCALE);
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);
cd->xrange = gtk_preview_new (GTK_PREVIEW_GRAYSCALE);
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 */
label = gtk_label_new (_("Curve Type: "));
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 */
toggle = gtk_check_button_new_with_label (_("Preview"));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), cd->preview);
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;
}
static void
curves_update (CurvesDialog *cd,
int update)
{
GdkRectangle area;
int i, j;
if (update & XRANGE_TOP)
{
for (i = 0; i < XRANGE_HEIGHT / 2; i++)
gtk_preview_draw_row (GTK_PREVIEW (cd->xrange),
cd->curve[cd->channel],
0, i, XRANGE_WIDTH);
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)
{
unsigned char buf[XRANGE_WIDTH];
for (i = 0; i < XRANGE_WIDTH; i++)
buf[i] = i;
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)
{
unsigned char buf[YRANGE_WIDTH];
for (i = 0; i < YRANGE_HEIGHT; i++)
{
for (j = 0; j < YRANGE_WIDTH; j++)
buf[j] = (255 - i);
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);
}
/* draw the colour line */
gdk_draw_line(cd->pixmap, cd->graph->style->black_gc,
cd->col_value[cd->channel],RADIUS,
cd->col_value[cd->channel],GRAPH_HEIGHT + RADIUS);
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;
gint32 newx, newy;
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;
newx = CLAMP0255 (ROUND (x));
newy = CLAMP0255 (ROUND (y));
/* 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;
}
}
void
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;
}
gimp_lut_setup(cd->lut, (GimpLutFunc) curves_lut_func,
(void *) cd, gimp_drawable_bytes(cd->drawable));
}
static void
curves_preview (CurvesDialog *cd)
{
if (!cd->image_map)
g_message (_("curves_preview(): No image map"));
active_tool->preserve = TRUE; /* Going to dirty the display... */
image_map_apply (cd->image_map, (ImageMapApplyFunc)gimp_lut_process_2,
(void *) cd->lut);
active_tool->preserve = FALSE; /* All done */
}
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;
curves_update (cd, GRAPH | DRAW);
}
}
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;
curves_update (cd, GRAPH | DRAW);
}
}
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;
curves_update (cd, GRAPH | DRAW);
}
}
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;
curves_update (cd, GRAPH | DRAW);
}
}
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;
curves_update (cd, GRAPH | DRAW);
}
}
static void
curves_smooth_callback (GtkWidget *w,
gpointer client_data)
{
CurvesDialog *cd;
int i;
gint32 index;
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++)
{
index = CLAMP0255 (i * 32);
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;
curves_update (cd, GRAPH | DRAW);
}
}
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;
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);
active_tool->preserve = TRUE; /* We're about to dirty... */
if (!cd->preview)
image_map_apply (cd->image_map, (ImageMapApplyFunc)gimp_lut_process_2,
(void *) cd->lut);
if (cd->image_map)
image_map_commit (cd->image_map);
active_tool->preserve = FALSE;
cd->image_map = NULL;
}
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)
{
active_tool->preserve = TRUE;
image_map_abort (cd->image_map);
active_tool->preserve = FALSE;
gdisplays_flush ();
}
cd->image_map = NULL;
}
static gint
curves_delete_callback (GtkWidget *w,
GdkEvent *e,
gpointer data)
{
curves_cancel_callback (w, data);
return TRUE;
}
static void
curves_preview_update (GtkWidget *w,
gpointer data)
{
CurvesDialog *cd;
cd = (CurvesDialog *) data;
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;
}
curves_calculate_curve (cd);
curves_update (cd, GRAPH | XRANGE_TOP | DRAW);
gtk_grab_add(widget);
break;
case GDK_BUTTON_RELEASE:
new_type = GDK_FLEUR;
cd->grab_point = -1;
if (cd->preview)
curves_preview (cd);
gtk_grab_remove(widget);
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]);
}
}
}
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