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gimp/app/paint/gimpsmudge.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/pixel-region.h"
#include "base/temp-buf.h"
#include "paint-funcs/paint-funcs.h"
#include "core/gimp.h"
#include "core/gimpbrush.h"
#include "core/gimpdrawable.h"
#include "core/gimpimage.h"
#include "gimpsmudge.h"
#include "gimpsmudgeoptions.h"
#include "gimp-intl.h"
static void gimp_smudge_class_init (GimpSmudgeClass *klass);
static void gimp_smudge_init (GimpSmudge *smudge);
static void gimp_smudge_finalize (GObject *object);
static void gimp_smudge_paint (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpPaintCoreState paint_state);
static gboolean gimp_smudge_start (GimpPaintCore *paint_core,
GimpDrawable *drawable);
static void gimp_smudge_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options);
static void gimp_smudge_nonclipped_painthit_coords (GimpPaintCore *paint_core,
gint *x,
gint *y,
gint *w,
gint *h);
static GimpPaintCoreClass *parent_class = NULL;
void
gimp_smudge_register (Gimp *gimp,
GimpPaintRegisterCallback callback)
{
(* callback) (gimp,
GIMP_TYPE_SMUDGE,
GIMP_TYPE_SMUDGE_OPTIONS,
_("Smudge"));
}
GType
gimp_smudge_get_type (void)
{
static GType type = 0;
if (! type)
{
static const GTypeInfo info =
{
sizeof (GimpSmudgeClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_smudge_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpSmudge),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_smudge_init,
};
type = g_type_register_static (GIMP_TYPE_PAINT_CORE,
"GimpSmudge",
&info, 0);
}
return type;
}
static void
gimp_smudge_class_init (GimpSmudgeClass *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_smudge_finalize;
paint_core_class->paint = gimp_smudge_paint;
}
static void
gimp_smudge_init (GimpSmudge *smudge)
{
GimpPaintCore *paint_core;
paint_core = GIMP_PAINT_CORE (smudge);
smudge->initialized = FALSE;
smudge->accum_data = NULL;
}
static void
gimp_smudge_finalize (GObject *object)
{
GimpSmudge *smudge;
smudge = GIMP_SMUDGE (object);
if (smudge->accum_data)
{
g_free (smudge->accum_data);
smudge->accum_data = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_smudge_paint (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpPaintCoreState paint_state)
{
GimpSmudge *smudge;
smudge = GIMP_SMUDGE (paint_core);
switch (paint_state)
{
case MOTION_PAINT:
/* initialization fails if the user starts outside the drawable */
if (! smudge->initialized)
smudge->initialized = gimp_smudge_start (paint_core, drawable);
if (smudge->initialized)
gimp_smudge_motion (paint_core, drawable, paint_options);
break;
case FINISH_PAINT:
if (smudge->accum_data)
{
g_free (smudge->accum_data);
smudge->accum_data = NULL;
}
smudge->initialized = FALSE;
break;
default:
break;
}
return;
}
static gboolean
gimp_smudge_start (GimpPaintCore *paint_core,
GimpDrawable *drawable)
{
GimpSmudge *smudge;
GimpImage *gimage;
TempBuf *area;
PixelRegion srcPR;
gint x, y, w, h;
smudge = GIMP_SMUDGE (paint_core);
if (! (gimage = gimp_item_get_image (GIMP_ITEM (drawable))))
return FALSE;
if (gimp_drawable_is_indexed (drawable))
return FALSE;
if (! (area = gimp_paint_core_get_paint_area (paint_core, drawable, 1.0)))
return FALSE;
/* adjust the x and y coordinates to the upper left corner of the brush */
gimp_smudge_nonclipped_painthit_coords (paint_core, &x, &y, &w, &h);
/* Allocate the accumulation buffer */
smudge->accumPR.bytes = gimp_drawable_bytes (drawable);
smudge->accum_data = g_malloc (w * h * smudge->accumPR.bytes);
/* If clipped, prefill the smudge buffer
with the color at the brush position. */
if (x != area->x || y != area->y || w != area->width || h != area->height)
{
guchar *fill;
fill = gimp_drawable_get_color_at (drawable,
CLAMP ((gint) paint_core->cur_coords.x,
0, gimp_item_width (GIMP_ITEM (drawable)) - 1),
CLAMP ((gint) paint_core->cur_coords.y,
0, gimp_item_height (GIMP_ITEM (drawable)) - 1));
g_return_val_if_fail (fill != NULL, FALSE);
srcPR.w = w;
srcPR.h = h;
srcPR.bytes = smudge->accumPR.bytes;
srcPR.rowstride = srcPR.bytes * w;
srcPR.data = smudge->accum_data;
color_region (&srcPR, fill);
g_free (fill);
}
smudge->accumPR.x = area->x - x;
smudge->accumPR.y = area->y - y;
smudge->accumPR.w = area->width;
smudge->accumPR.h = area->height;
smudge->accumPR.rowstride = smudge->accumPR.bytes * w;
smudge->accumPR.data = (smudge->accum_data +
smudge->accumPR.rowstride * smudge->accumPR.y +
smudge->accumPR.x * smudge->accumPR.bytes);
pixel_region_init (&srcPR, gimp_drawable_data (drawable),
area->x, area->y, area->width, area->height, FALSE);
/* copy the region under the original painthit. */
copy_region (&srcPR, &smudge->accumPR);
smudge->accumPR.x = area->x - x;
smudge->accumPR.y = area->y - y;
smudge->accumPR.w = area->width;
smudge->accumPR.h = area->height;
smudge->accumPR.rowstride = smudge->accumPR.bytes * w;
smudge->accumPR.data = (smudge->accum_data +
smudge->accumPR.rowstride * smudge->accumPR.y +
smudge->accumPR.x * smudge->accumPR.bytes);
return TRUE;
}
static void
gimp_smudge_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options)
{
GimpSmudge *smudge;
GimpSmudgeOptions *options;
GimpPressureOptions *pressure_options;
GimpContext *context;
GimpImage *gimage;
TempBuf *area;
PixelRegion srcPR, destPR, tempPR;
gdouble rate;
gdouble opacity;
gint x, y, w, h;
smudge = GIMP_SMUDGE (paint_core);
options = GIMP_SMUDGE_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;
gimp_smudge_nonclipped_painthit_coords (paint_core, &x, &y, &w, &h);
/* Get the paint area (Smudge won't scale!) */
if (! (area = gimp_paint_core_get_paint_area (paint_core, drawable, 1.0)))
return;
/* srcPR will be the pixels under the current painthit from the drawable */
pixel_region_init (&srcPR, gimp_drawable_data (drawable),
area->x, area->y, area->width, area->height, FALSE);
/* Enable pressure sensitive rate */
if (pressure_options->rate)
rate = MIN (options->rate / 100.0 * 2.0 * paint_core->cur_coords.pressure,
1.0);
else
rate = options->rate / 100.0;
/* The tempPR will be the built up buffer (for smudge) */
tempPR.x = area->x - x;
tempPR.y = area->y - y;
tempPR.w = area->width;
tempPR.h = area->height;
tempPR.bytes = smudge->accumPR.bytes;
tempPR.rowstride = smudge->accumPR.rowstride;
tempPR.data = (smudge->accum_data +
tempPR.y * tempPR.rowstride +
tempPR.x * tempPR.bytes);
/* The dest will be the paint area we got above (= canvas_buf) */
destPR.x = 0;
destPR.y = 0;
destPR.w = area->width;
destPR.h = area->height;
destPR.bytes = area->bytes;
destPR.rowstride = area->width * area->bytes;
destPR.data = temp_buf_data (area);
/* Smudge uses the buffer Accum.
* For each successive painthit Accum is built like this
* Accum = rate*Accum + (1-rate)*I.
* where I is the pixels under the current painthit.
* Then the paint area (canvas_buf) is built as
* (Accum,1) (if no alpha),
*/
blend_region (&srcPR, &tempPR, &tempPR, ROUND (rate * 255.0));
/* re-init the tempPR */
tempPR.x = area->x - x;
tempPR.y = area->y - y;
tempPR.w = area->width;
tempPR.h = area->height;
tempPR.bytes = smudge->accumPR.bytes;
tempPR.rowstride = smudge->accumPR.rowstride;
tempPR.data = (smudge->accum_data +
tempPR.y * tempPR.rowstride +
tempPR.x * tempPR.bytes);
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 made paint area 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),
1.0,
GIMP_PAINT_INCREMENTAL);
}
static void
gimp_smudge_nonclipped_painthit_coords (GimpPaintCore *paint_core,
gint *x,
gint *y,
gint *w,
gint *h)
{
/* Note: these are the brush mask size plus a border of 1 pixel */
*x =
(gint) paint_core->cur_coords.x - paint_core->brush->mask->width / 2 - 1;
*y =
(gint) paint_core->cur_coords.y - paint_core->brush->mask->height / 2 - 1;
*w = paint_core->brush->mask->width + 2;
*h = paint_core->brush->mask->height + 2;
}
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