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gimp/app/dodgeburn.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 "config.h"
#include <gdk/gdkkeysyms.h>
#include "appenv.h"
#include "drawable.h"
#include "dodgeburn.h"
#include "gdisplay.h"
#include "gimplut.h"
#include "gimpui.h"
#include "paint_funcs.h"
#include "paint_core.h"
#include "paint_options.h"
#include "selection.h"
#include "tools.h"
#include "gimage.h"
#include "libgimp/gimpmath.h"
#include "libgimp/gimpintl.h"
/* the dodgeburn structures */
typedef struct _DodgeBurnOptions DodgeBurnOptions;
struct _DodgeBurnOptions
{
PaintOptions paint_options;
DodgeBurnType type;
DodgeBurnType type_d;
GtkWidget *type_w[2];
DodgeBurnMode mode; /*highlights, midtones, shadows*/
DodgeBurnMode mode_d;
GtkWidget *mode_w[3];
gdouble exposure;
gdouble exposure_d;
GtkObject *exposure_w;
GimpLut *lut;
};
static void
dodgeburn_make_luts (PaintCore *, double, DodgeBurnType, DodgeBurnMode,
GimpLut *, GimpDrawable *);
static gfloat dodgeburn_highlights_lut_func (void *, int, int, gfloat);
static gfloat dodgeburn_midtones_lut_func (void *, int, int, gfloat);
static gfloat dodgeburn_shadows_lut_func (void *, int, int, gfloat);
/* The dodge burn lookup tables */
gfloat dodgeburn_highlights (void *, int, int, gfloat);
gfloat dodgeburn_midtones (void *, int, int, gfloat);
gfloat dodgeburn_shadows (void *, int, int, gfloat);
/* the dodgeburn tool options */
static DodgeBurnOptions * dodgeburn_options = NULL;
/* Non gui function */
static double non_gui_exposure;
static GimpLut *non_gui_lut;
/* Default values */
#define DODGEBURN_DEFAULT_TYPE DODGE
#define DODGEBURN_DEFAULT_EXPOSURE 50.0
#define DODGEBURN_DEFAULT_MODE DODGEBURN_HIGHLIGHTS
static void dodgeburn_motion (PaintCore *,
PaintPressureOptions *,
double, GimpLut *, GimpDrawable *);
static void dodgeburn_init (PaintCore *, GimpDrawable *);
static void dodgeburn_finish (PaintCore *, GimpDrawable *);
/* functions */
static void
dodgeburn_options_reset (void)
{
DodgeBurnOptions *options = dodgeburn_options;
paint_options_reset ((PaintOptions *) options);
gtk_adjustment_set_value (GTK_ADJUSTMENT (options->exposure_w),
options->exposure_d);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->type_w[options->type_d]), TRUE);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->mode_w[options->mode_d]), TRUE);
}
static DodgeBurnOptions *
dodgeburn_options_new (void)
{
DodgeBurnOptions *options;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *label;
GtkWidget *scale;
GtkWidget *frame;
/* the new dodgeburn tool options structure */
options = g_new (DodgeBurnOptions, 1);
paint_options_init ((PaintOptions *) options,
DODGEBURN,
dodgeburn_options_reset);
options->type = options->type_d = DODGEBURN_DEFAULT_TYPE;
options->exposure = options->exposure_d = DODGEBURN_DEFAULT_EXPOSURE;
options->mode = options->mode_d = DODGEBURN_DEFAULT_MODE;
/* the main vbox */
vbox = ((ToolOptions *) options)->main_vbox;
/* the exposure scale */
hbox = gtk_hbox_new (FALSE, 4);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
label = gtk_label_new (_("Exposure:"));
gtk_misc_set_alignment (GTK_MISC (label), 1.0, 1.0);
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
options->exposure_w =
gtk_adjustment_new (options->exposure_d, 0.0, 100.0, 1.0, 1.0, 0.0);
scale = gtk_hscale_new (GTK_ADJUSTMENT (options->exposure_w));
gtk_box_pack_start (GTK_BOX (hbox), scale, TRUE, TRUE, 0);
gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (options->exposure_w), "value_changed",
GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
&options->exposure);
gtk_widget_show (scale);
gtk_widget_show (hbox);
/* the type (dodge or burn) */
frame = gimp_radio_group_new2 (TRUE, _("Type"),
gimp_radio_button_update,
&options->type, (gpointer) options->type,
_("Dodge"), (gpointer) DODGE,
&options->type_w[0],
_("Burn"), (gpointer) BURN,
&options->type_w[1],
NULL);
gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
/* mode (highlights, midtones, or shadows) */
frame =
gimp_radio_group_new2 (TRUE, _("Mode"),
gimp_radio_button_update,
&options->mode, (gpointer) options->mode,
_("Highlights"), (gpointer) DODGEBURN_HIGHLIGHTS,
&options->mode_w[0],
_("Midtones"), (gpointer) DODGEBURN_MIDTONES,
&options->mode_w[1],
_("Shadows"), (gpointer) DODGEBURN_SHADOWS,
&options->mode_w[2],
NULL);
gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
return options;
}
void *
dodgeburn_paint_func (PaintCore *paint_core,
GimpDrawable *drawable,
int state)
{
switch (state)
{
case INIT_PAINT:
dodgeburn_init (paint_core, drawable);
break;
case MOTION_PAINT:
dodgeburn_motion (paint_core,
dodgeburn_options->paint_options.pressure_options,
dodgeburn_options->exposure, dodgeburn_options->lut, drawable);
break;
case FINISH_PAINT:
dodgeburn_finish (paint_core, drawable);
break;
}
return NULL;
}
static void
dodgeburn_finish (PaintCore *paint_core,
GimpDrawable *drawable)
{
/* Here we destroy the luts to do the painting with.*/
if (dodgeburn_options->lut)
{
gimp_lut_free (dodgeburn_options->lut);
dodgeburn_options->lut = NULL;
}
}
static void
dodgeburn_init (PaintCore *paint_core,
GimpDrawable *drawable)
{
/* Here we create the luts to do the painting with.*/
dodgeburn_options->lut = gimp_lut_new();
dodgeburn_make_luts (paint_core,
dodgeburn_options->exposure,
dodgeburn_options->type,
dodgeburn_options->mode,
dodgeburn_options->lut,
drawable);
}
static void
dodgeburn_make_luts (PaintCore *paint_core,
double db_exposure,
DodgeBurnType type,
DodgeBurnMode mode,
GimpLut *lut,
GimpDrawable *drawable)
{
GimpLutFunc lut_func;
int nchannels = gimp_drawable_bytes (drawable);
static gfloat exposure;
exposure = (db_exposure) / 100.0;
/* make the exposure negative if burn for luts*/
if (type == BURN)
exposure = -exposure;
switch (mode)
{
case DODGEBURN_HIGHLIGHTS:
lut_func = dodgeburn_highlights_lut_func;
break;
case DODGEBURN_MIDTONES:
lut_func = dodgeburn_midtones_lut_func;
break;
case DODGEBURN_SHADOWS:
lut_func = dodgeburn_shadows_lut_func;
break;
default:
lut_func = NULL;
break;
}
gimp_lut_setup_exact (lut,
lut_func, (void *)&exposure,
nchannels);
}
static void
dodgeburn_modifier_key_func (Tool *tool,
GdkEventKey *kevent,
gpointer gdisp_ptr)
{
switch (kevent->keyval)
{
case GDK_Alt_L:
case GDK_Alt_R:
break;
case GDK_Shift_L:
case GDK_Shift_R:
if (kevent->state & GDK_CONTROL_MASK) /* reset tool toggle */
{
switch (dodgeburn_options->type)
{
case BURN:
gtk_toggle_button_set_active
(GTK_TOGGLE_BUTTON (dodgeburn_options->type_w[DODGE]), TRUE);
break;
case DODGE:
gtk_toggle_button_set_active
(GTK_TOGGLE_BUTTON (dodgeburn_options->type_w[BURN]), TRUE);
break;
default:
break;
}
}
break;
case GDK_Control_L:
case GDK_Control_R:
if ( !(kevent->state & GDK_SHIFT_MASK) ) /* shift enables line draw mode */
{
switch (dodgeburn_options->type)
{
case BURN:
gtk_toggle_button_set_active
(GTK_TOGGLE_BUTTON (dodgeburn_options->type_w[DODGE]), TRUE);
break;
case DODGE:
gtk_toggle_button_set_active
(GTK_TOGGLE_BUTTON (dodgeburn_options->type_w[BURN]), TRUE);
break;
default:
break;
}
}
break;
}
tool->toggled = (dodgeburn_options->type == BURN);
}
static void
dodgeburn_cursor_update_func (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
tool->toggled = (dodgeburn_options->type == BURN);
paint_core_cursor_update (tool, mevent, gdisp_ptr);
}
Tool *
tools_new_dodgeburn (void)
{
Tool * tool;
PaintCore * private;
/* The tool options */
if (! dodgeburn_options)
{
dodgeburn_options = dodgeburn_options_new ();
tools_register (DODGEBURN, (ToolOptions *) dodgeburn_options);
/* press all default buttons */
dodgeburn_options_reset ();
}
tool = paint_core_new (DODGEBURN);
tool->modifier_key_func = dodgeburn_modifier_key_func;
tool->cursor_update_func = dodgeburn_cursor_update_func;
private = (PaintCore *) tool->private;
private->paint_func = dodgeburn_paint_func;
private->flags |= TOOL_CAN_HANDLE_CHANGING_BRUSH;
return tool;
}
void
tools_free_dodgeburn (Tool *tool)
{
/* delete any luts here */
paint_core_free (tool);
}
static void
dodgeburn_motion (PaintCore *paint_core,
PaintPressureOptions *pressure_options,
double dodgeburn_exposure,
GimpLut *lut,
GimpDrawable *drawable)
{
GImage *gimage;
TempBuf * area;
TempBuf * orig;
PixelRegion srcPR, destPR, tempPR;
guchar *temp_data;
gint opacity;
gdouble scale;
if (! (gimage = drawable_gimage (drawable)))
return;
/* If the image type is indexed, don't dodgeburn */
if ((drawable_type (drawable) == INDEXED_GIMAGE) ||
(drawable_type (drawable) == INDEXEDA_GIMAGE))
return;
if (pressure_options->size)
scale = paint_core->curpressure;
else
scale = 1.0;
/* Get a region which can be used to paint to */
if (! (area = paint_core_get_paint_area (paint_core, drawable, scale)))
return;
/* Constant painting --get a copy of the orig drawable (with
no paint from this stroke yet) */
{
gint x1, y1, x2, y2;
x1 = CLAMP (area->x, 0, drawable_width (drawable));
y1 = CLAMP (area->y, 0, drawable_height (drawable));
x2 = CLAMP (area->x + area->width, 0, drawable_width (drawable));
y2 = CLAMP (area->y + area->height, 0, drawable_height (drawable));
if (!(x2 - x1) || !(y2 - y1))
return;
/* get the original untouched image */
orig = paint_core_get_orig_image (paint_core, drawable, x1, y1, x2, y2);
srcPR.bytes = orig->bytes;
srcPR.x = 0;
srcPR.y = 0;
srcPR.w = x2 - x1;
srcPR.h = y2 - y1;
srcPR.rowstride = srcPR.bytes * orig->width;
srcPR.data = temp_buf_data (orig);
}
/* tempPR will hold the dodgeburned region*/
tempPR.bytes = srcPR.bytes;
tempPR.x = srcPR.x;
tempPR.y = srcPR.y;
tempPR.w = srcPR.w;
tempPR.h = srcPR.h;
tempPR.rowstride = tempPR.bytes * tempPR.w;
temp_data = g_malloc (tempPR.h * tempPR.rowstride);
tempPR.data = temp_data;
/* DodgeBurn the region */
gimp_lut_process (lut, &srcPR, &tempPR);
/* The dest is the paint area we got above (= canvas_buf) */
destPR.bytes = area->bytes;
destPR.x = 0; destPR.y = 0;
destPR.w = area->width;
destPR.h = area->height;
destPR.rowstride = area->width * destPR.bytes;
destPR.data = temp_buf_data (area);
/* Now add an alpha to the dodgeburned region
and put this in area = canvas_buf */
if (!drawable_has_alpha (drawable))
add_alpha_region (&tempPR, &destPR);
else
copy_region (&tempPR, &destPR);
opacity = 255 * gimp_context_get_opacity (NULL);
if (pressure_options->opacity)
opacity = opacity * 2.0 * paint_core->curpressure;
/* Replace the newly dodgedburned area (canvas_buf) to the gimage*/
paint_core_replace_canvas (paint_core, drawable,
MIN (opacity, 255),
OPAQUE_OPACITY,
pressure_options->pressure ? PRESSURE : SOFT,
scale, CONSTANT);
g_free (temp_data);
}
static void *
dodgeburn_non_gui_paint_func (PaintCore *paint_core,
GimpDrawable *drawable,
int state)
{
dodgeburn_motion (paint_core, &non_gui_pressure_options,
non_gui_exposure, non_gui_lut, drawable);
return NULL;
}
gboolean
dodgeburn_non_gui_default (GimpDrawable *drawable,
int num_strokes,
double *stroke_array)
{
double exposure = DODGEBURN_DEFAULT_TYPE;
DodgeBurnType type = DODGEBURN_DEFAULT_TYPE;
DodgeBurnMode mode = DODGEBURN_DEFAULT_MODE;
DodgeBurnOptions *options = dodgeburn_options;
if (options)
{
exposure = dodgeburn_options->exposure;
type = dodgeburn_options->type;
mode = dodgeburn_options->mode;
}
return dodgeburn_non_gui (drawable, exposure, type, mode, num_strokes, stroke_array);
}
gboolean
dodgeburn_non_gui (GimpDrawable *drawable,
double exposure,
DodgeBurnType type,
DodgeBurnMode mode,
int num_strokes,
double *stroke_array)
{
int i;
if (paint_core_init (&non_gui_paint_core, drawable,
stroke_array[0], stroke_array[1]))
{
/* Set the paint core's paint func */
non_gui_paint_core.paint_func = dodgeburn_non_gui_paint_func;
non_gui_exposure = exposure;
non_gui_lut = gimp_lut_new();
dodgeburn_make_luts (&non_gui_paint_core,
exposure,
type,
mode,
non_gui_lut,
drawable);
non_gui_paint_core.startx = non_gui_paint_core.lastx = stroke_array[0];
non_gui_paint_core.starty = non_gui_paint_core.lasty = stroke_array[1];
dodgeburn_non_gui_paint_func (&non_gui_paint_core, drawable, 0);
for (i = 1; i < num_strokes; i++)
{
non_gui_paint_core.curx = stroke_array[i * 2 + 0];
non_gui_paint_core.cury = stroke_array[i * 2 + 1];
paint_core_interpolate (&non_gui_paint_core, drawable);
non_gui_paint_core.lastx = non_gui_paint_core.curx;
non_gui_paint_core.lasty = non_gui_paint_core.cury;
}
/* Finish the painting */
paint_core_finish (&non_gui_paint_core, drawable, -1);
/* Cleanup */
paint_core_cleanup ();
gimp_lut_free (non_gui_lut);
return TRUE;
}
else
return FALSE;
}
static gfloat
dodgeburn_highlights_lut_func (void *user_data,
int nchannels,
int channel,
gfloat value)
{
gfloat * exposure_ptr = (gfloat *)user_data;
gfloat exposure = *exposure_ptr;
gfloat factor = 1.0 + exposure * (.333333);
if ((nchannels == 2 && channel == 1) ||
(nchannels == 4 && channel == 3))
return value;
return factor * value;
}
static gfloat
dodgeburn_midtones_lut_func (void *user_data,
int nchannels,
int channel,
gfloat value)
{
gfloat * exposure_ptr = (gfloat *)user_data;
gfloat exposure = *exposure_ptr;
gfloat factor;
if ((nchannels == 2 && channel == 1) ||
(nchannels == 4 && channel == 3))
return value;
if (exposure < 0)
factor = 1.0 - exposure * (.333333);
else
factor = 1/(1.0 + exposure);
return pow (value, factor);
}
static gfloat
dodgeburn_shadows_lut_func (void *user_data,
int nchannels,
int channel,
gfloat value)
{
gfloat * exposure_ptr = (gfloat *)user_data;
gfloat exposure = *exposure_ptr;
gfloat new_value;
gfloat factor;
if ( (nchannels == 2 && channel == 1) ||
(nchannels == 4 && channel == 3))
return value;
if (exposure >= 0)
{
factor = 0.333333 * exposure;
new_value = factor + value - factor * value;
}
else /* exposure < 0 */
{
factor = -0.333333 * exposure;
if (value < factor)
new_value = 0;
else /*factor <= value <=1*/
new_value = (value - factor)/(1 - factor);
}
return new_value;
}
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