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gimp/app/paint/gimpdodgeburn.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 <glib-object.h>
#include "libgimpmath/gimpmath.h"
#include "paint-types.h"
#include "base/gimplut.h"
#include "base/pixel-region.h"
#include "base/temp-buf.h"
#include "paint-funcs/paint-funcs.h"
#include "core/gimp.h"
#include "core/gimpdrawable.h"
#include "core/gimpimage.h"
#include "gimpdodgeburn.h"
#include "gimpdodgeburnoptions.h"
#include "gimp-intl.h"
static void gimp_dodge_burn_class_init (GimpDodgeBurnClass *klass);
static void gimp_dodge_burn_init (GimpDodgeBurn *dodgeburn);
static void gimp_dodge_burn_finalize (GObject *object);
static void gimp_dodge_burn_paint (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpPaintCoreState paint_state);
static void gimp_dodge_burn_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options);
static void gimp_dodge_burn_make_luts (GimpDodgeBurn *dodgeburn,
gdouble db_exposure,
GimpDodgeBurnType type,
GimpTransferMode mode,
GimpDrawable *drawable);
static gfloat gimp_dodge_burn_highlights_lut_func (gpointer user_data,
gint nchannels,
gint channel,
gfloat value);
static gfloat gimp_dodge_burn_midtones_lut_func (gpointer user_data,
gint nchannels,
gint channel,
gfloat value);
static gfloat gimp_dodge_burn_shadows_lut_func (gpointer user_data,
gint nchannels,
gint channel,
gfloat value);
static GimpPaintCoreClass *parent_class = NULL;
void
gimp_dodge_burn_register (Gimp *gimp,
GimpPaintRegisterCallback callback)
{
(* callback) (gimp,
GIMP_TYPE_DODGE_BURN,
GIMP_TYPE_DODGE_BURN_OPTIONS,
_("Dodge/Burn"));
}
GType
gimp_dodge_burn_get_type (void)
{
static GType type = 0;
if (! type)
{
static const GTypeInfo info =
{
sizeof (GimpDodgeBurnClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_dodge_burn_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpDodgeBurn),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_dodge_burn_init,
};
type = g_type_register_static (GIMP_TYPE_PAINT_CORE,
"GimpDodgeBurn",
&info, 0);
}
return type;
}
static void
gimp_dodge_burn_class_init (GimpDodgeBurnClass *klass)
{
GObjectClass *object_class;
GimpPaintCoreClass *paint_core_class;
object_class = G_OBJECT_CLASS (klass);
paint_core_class = GIMP_PAINT_CORE_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = gimp_dodge_burn_finalize;
paint_core_class->paint = gimp_dodge_burn_paint;
}
static void
gimp_dodge_burn_init (GimpDodgeBurn *dodgeburn)
{
GimpPaintCore *paint_core;
paint_core = GIMP_PAINT_CORE (dodgeburn);
paint_core->flags |= CORE_HANDLES_CHANGING_BRUSH;
}
static void
gimp_dodge_burn_finalize (GObject *object)
{
GimpDodgeBurn *dodgeburn;
dodgeburn = GIMP_DODGE_BURN (object);
if (dodgeburn->lut)
{
gimp_lut_free (dodgeburn->lut);
dodgeburn->lut = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_dodge_burn_paint (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpPaintCoreState paint_state)
{
GimpDodgeBurn *dodgeburn;
GimpDodgeBurnOptions *options;
dodgeburn = GIMP_DODGE_BURN (paint_core);
options = GIMP_DODGE_BURN_OPTIONS (paint_options);
switch (paint_state)
{
case INIT_PAINT:
dodgeburn->lut = gimp_lut_new ();
gimp_dodge_burn_make_luts (dodgeburn,
options->exposure,
options->type,
options->mode,
drawable);
break;
case MOTION_PAINT:
gimp_dodge_burn_motion (paint_core, drawable, paint_options);
break;
case FINISH_PAINT:
if (dodgeburn->lut)
{
gimp_lut_free (dodgeburn->lut);
dodgeburn->lut = NULL;
}
break;
default:
break;
}
}
static void
gimp_dodge_burn_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options)
{
GimpDodgeBurn *dodgeburn;
GimpDodgeBurnOptions *options;
GimpContext *context;
GimpPressureOptions *pressure_options;
GimpImage *gimage;
TempBuf *area;
TempBuf *orig;
PixelRegion srcPR, destPR, tempPR;
guchar *temp_data;
gdouble opacity;
gdouble scale;
dodgeburn = GIMP_DODGE_BURN (paint_core);
options = GIMP_DODGE_BURN_OPTIONS (paint_options);
context = GIMP_CONTEXT (paint_options);
pressure_options = paint_options->pressure_options;
if (! (gimage = gimp_item_get_image (GIMP_ITEM (drawable))))
return;
if (gimp_drawable_is_indexed (drawable))
return;
opacity = gimp_paint_options_get_fade (paint_options, gimage,
paint_core->pixel_dist);
if (opacity == 0.0)
return;
if (pressure_options->size)
scale = paint_core->cur_coords.pressure;
else
scale = 1.0;
/* Get a region which can be used to paint to */
if (! (area = gimp_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)
*/
{
GimpItem *item;
gint x1, y1, x2, y2;
item = GIMP_ITEM (drawable);
x1 = CLAMP (area->x, 0, gimp_item_width (item));
y1 = CLAMP (area->y, 0, gimp_item_height (item));
x2 = CLAMP (area->x + area->width, 0, gimp_item_width (item));
y2 = CLAMP (area->y + area->height, 0, gimp_item_height (item));
if (!(x2 - x1) || !(y2 - y1))
return;
/* get the original untouched image */
orig = gimp_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;
tempPR.data = g_malloc (tempPR.h * tempPR.rowstride);
temp_data = tempPR.data;
/* DodgeBurn the region */
gimp_lut_process (dodgeburn->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 (! gimp_drawable_has_alpha (drawable))
add_alpha_region (&tempPR, &destPR);
else
copy_region (&tempPR, &destPR);
if (pressure_options->opacity)
opacity *= 2.0 * paint_core->cur_coords.pressure;
/* Replace the newly dodgedburned area (canvas_buf) to the gimage */
gimp_paint_core_replace_canvas (paint_core, drawable,
MIN (opacity, GIMP_OPACITY_OPAQUE),
gimp_context_get_opacity (context),
gimp_paint_options_get_brush_mode (paint_options),
scale,
GIMP_PAINT_CONSTANT);
g_free (temp_data);
}
static void
gimp_dodge_burn_make_luts (GimpDodgeBurn *dodgeburn,
gdouble db_exposure,
GimpDodgeBurnType type,
GimpTransferMode mode,
GimpDrawable *drawable)
{
GimpLutFunc lut_func;
gint nchannels = gimp_drawable_bytes (drawable);
static gfloat exposure;
exposure = db_exposure / 100.0;
/* make the exposure negative if burn for luts*/
if (type == GIMP_BURN)
exposure = -exposure;
switch (mode)
{
case GIMP_HIGHLIGHTS:
lut_func = gimp_dodge_burn_highlights_lut_func;
break;
case GIMP_MIDTONES:
lut_func = gimp_dodge_burn_midtones_lut_func;
break;
case GIMP_SHADOWS:
lut_func = gimp_dodge_burn_shadows_lut_func;
break;
default:
lut_func = NULL;
break;
}
gimp_lut_setup_exact (dodgeburn->lut,
lut_func, (gpointer) &exposure,
nchannels);
}
static gfloat
gimp_dodge_burn_highlights_lut_func (gpointer user_data,
gint nchannels,
gint 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
gimp_dodge_burn_midtones_lut_func (gpointer user_data,
gint nchannels,
gint 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
gimp_dodge_burn_shadows_lut_func (gpointer user_data,
gint nchannels,
gint 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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