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gimp/app/paint/gimppaintbrush.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 <gtk/gtk.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpbase/gimpbase.h"
#include "paint-types.h"
#include "base/temp-buf.h"
#include "paint-funcs/paint-funcs.h"
#include "core/gimp.h"
#include "core/gimpbrush.h"
#include "core/gimpcontext.h"
#include "core/gimpdrawable.h"
#include "core/gimpgradient.h"
#include "core/gimpimage.h"
#include "gimppaintbrush.h"
#include "gimppaintoptions.h"
static void gimp_paintbrush_class_init (GimpPaintbrushClass *klass);
static void gimp_paintbrush_init (GimpPaintbrush *paintbrush);
static void gimp_paintbrush_paint (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpPaintCoreState paint_state);
static void gimp_paintbrush_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPressureOptions *pressure_options,
GimpGradientOptions *gradient_options,
gdouble fade_out,
gdouble gradient_length,
gboolean incremental,
GradientPaintMode gradient_type);
static GimpPaintCoreClass *parent_class = NULL;
void
gimp_paintbrush_register (Gimp *gimp,
GimpPaintRegisterCallback callback)
{
(* callback) (gimp, GIMP_TYPE_PAINTBRUSH);
}
GType
gimp_paintbrush_get_type (void)
{
static GType type = 0;
if (! type)
{
static const GTypeInfo info =
{
sizeof (GimpPaintbrushClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_paintbrush_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpPaintbrush),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_paintbrush_init,
};
type = g_type_register_static (GIMP_TYPE_PAINT_CORE,
"GimpPaintbrush",
&info, 0);
}
return type;
}
static void
gimp_paintbrush_class_init (GimpPaintbrushClass *klass)
{
GimpPaintCoreClass *paint_core_class;
paint_core_class = GIMP_PAINT_CORE_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
paint_core_class->paint = gimp_paintbrush_paint;
}
static void
gimp_paintbrush_init (GimpPaintbrush *paintbrush)
{
GimpPaintCore *paint_core;
paint_core = GIMP_PAINT_CORE (paintbrush);
paint_core->flags |= CORE_HANDLES_CHANGING_BRUSH;
}
static void
gimp_paintbrush_paint (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpPaintCoreState paint_state)
{
GimpPressureOptions *pressure_options;
GimpGradientOptions *gradient_options;
gboolean incremental;
GimpImage *gimage;
gdouble fade_out;
gdouble gradient_length;
gdouble unit_factor;
gimage = gimp_item_get_image (GIMP_ITEM (drawable));
pressure_options = paint_options->pressure_options;
gradient_options = paint_options->gradient_options;
incremental = paint_options->incremental;
switch (paint_state)
{
case INIT_PAINT:
break;
case MOTION_PAINT:
switch (gradient_options->fade_unit)
{
case GIMP_UNIT_PIXEL:
fade_out = gradient_options->fade_out;
break;
case GIMP_UNIT_PERCENT:
fade_out = (MAX (gimage->width, gimage->height) *
gradient_options->fade_out / 100);
break;
default:
unit_factor = gimp_unit_get_factor (gradient_options->fade_unit);
fade_out = (gradient_options->fade_out *
MAX (gimage->xresolution,
gimage->yresolution) / unit_factor);
break;
}
switch (gradient_options->gradient_unit)
{
case GIMP_UNIT_PIXEL:
gradient_length = gradient_options->gradient_length;
break;
case GIMP_UNIT_PERCENT:
gradient_length = (MAX (gimage->width, gimage->height) *
gradient_options->gradient_length / 100);
break;
default:
unit_factor = gimp_unit_get_factor (gradient_options->gradient_unit);
gradient_length = (gradient_options->gradient_length *
MAX (gimage->xresolution,
gimage->yresolution) / unit_factor);
break;
}
gimp_paintbrush_motion (paint_core, drawable,
pressure_options,
gradient_options,
gradient_options->use_fade ? fade_out : 0,
gradient_options->use_gradient ? gradient_length : 0,
incremental,
gradient_options->gradient_type);
break;
case FINISH_PAINT:
break;
default:
break;
}
}
static void
gimp_paintbrush_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPressureOptions *pressure_options,
GimpGradientOptions *gradient_options,
gdouble fade_out,
gdouble gradient_length,
gboolean incremental,
GradientPaintMode gradient_type)
{
GimpImage *gimage;
GimpContext *context;
TempBuf *area;
gdouble x, paint_left;
guchar local_blend = OPAQUE_OPACITY;
guchar temp_blend = OPAQUE_OPACITY;
guchar col[MAX_CHANNELS];
GimpRGB color;
gdouble opacity;
gdouble scale;
PaintApplicationMode paint_appl_mode = incremental ? INCREMENTAL : CONSTANT;
gimage = gimp_item_get_image (GIMP_ITEM (drawable));
context = gimp_get_current_context (gimage->gimp);
if (pressure_options->size)
scale = paint_core->cur_coords.pressure;
else
scale = 1.0;
if (pressure_options->color)
gradient_length = 1.0; /* not really used, only for if cases */
/* Get a region which can be used to paint to */
if (! (area = gimp_paint_core_get_paint_area (paint_core, drawable, scale)))
return;
/* factor in the fade out value */
if (fade_out)
{
/* Model the amount of paint left as a gaussian curve */
x = ((double) paint_core->pixel_dist / fade_out);
paint_left = exp (- x * x * 5.541); /* ln (1/255) */
local_blend = (int) (255 * paint_left);
}
if (local_blend)
{
/* set the alpha channel */
temp_blend = local_blend;
if (gradient_length)
{
GimpGradient *gradient;
gradient = gimp_context_get_gradient (context);
if (pressure_options->color)
gimp_gradient_get_color_at (gradient,
paint_core->cur_coords.pressure,
&color);
else
gimp_paint_core_get_color_from_gradient (paint_core,
gradient,
gradient_length,
&color,
gradient_type);
temp_blend = (gint) ((color.a * local_blend));
gimp_rgb_get_uchar (&color,
&col[RED_PIX],
&col[GREEN_PIX],
&col[BLUE_PIX]);
col[ALPHA_PIX] = OPAQUE_OPACITY;
/* always use incremental mode with gradients */
/* make the gui cool later */
paint_appl_mode = INCREMENTAL;
color_pixels (temp_buf_data (area), col,
area->width * area->height, area->bytes);
}
/* we check to see if this is a pixmap, if so composite the
* pixmap image into the area instead of the color
*/
else if (paint_core->brush && paint_core->brush->pixmap)
{
gimp_paint_core_color_area_with_pixmap (paint_core, gimage, drawable,
area,
scale, SOFT);
paint_appl_mode = INCREMENTAL;
}
else
{
gimp_image_get_foreground (gimage, drawable, col);
col[area->bytes - 1] = OPAQUE_OPACITY;
color_pixels (temp_buf_data (area), col,
area->width * area->height, area->bytes);
}
opacity = (gdouble) temp_blend / 255.0;
if (pressure_options->opacity)
opacity = opacity * 2.0 * paint_core->cur_coords.pressure;
gimp_paint_core_paste_canvas (paint_core, drawable,
MIN (opacity, GIMP_OPACITY_OPAQUE),
gimp_context_get_opacity (context),
gimp_context_get_paint_mode (context),
pressure_options->pressure ? PRESSURE : SOFT,
scale, paint_appl_mode);
}
}
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