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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 <gtk/gtk.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/gimpcontext.h"
#include "core/gimpdrawable.h"
#include "core/gimpimage.h"
#include "gimpsmudge.h"
static void gimp_smudge_class_init (GimpSmudgeClass *klass);
static void gimp_smudge_init (GimpSmudge *smudge);
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,
GimpPressureOptions *pressure_options,
gdouble smudge_rate);
static void gimp_smudge_finish (GimpPaintCore *paint_core,
GimpDrawable *drawable);
static void gimp_smudge_nonclipped_painthit_coords (GimpPaintCore *paint_core,
gint *x,
gint *y,
gint *w,
gint *h);
static void gimp_smudge_allocate_accum_buffer (gint w,
gint h,
gint bytes,
guchar *do_fill);
static PixelRegion accumPR;
static guchar *accum_data = NULL;
static GimpPaintCoreClass *parent_class = NULL;
void
gimp_smudge_register (Gimp *gimp,
GimpPaintRegisterCallback callback)
{
(* callback) (gimp, GIMP_TYPE_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)
{
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_smudge_paint;
}
static void
gimp_smudge_init (GimpSmudge *smudge)
{
GimpPaintCore *paint_core;
paint_core = GIMP_PAINT_CORE (smudge);
paint_core->flags |= CORE_HANDLES_CHANGING_BRUSH;
}
static void
gimp_smudge_paint (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpPaintCoreState paint_state)
{
GimpSmudgeOptions *options;
/* initialization fails if the user starts outside the drawable */
static gboolean initialized = FALSE;
options = (GimpSmudgeOptions *) paint_options;
switch (paint_state)
{
case MOTION_PAINT:
if (! initialized)
initialized = gimp_smudge_start (paint_core, drawable);
if (initialized)
gimp_smudge_motion (paint_core,
drawable,
paint_options->pressure_options,
options->rate);
break;
case FINISH_PAINT:
gimp_smudge_finish (paint_core, drawable);
initialized = FALSE;
break;
default:
break;
}
return;
}
static gboolean
gimp_smudge_start (GimpPaintCore *paint_core,
GimpDrawable *drawable)
{
GimpImage *gimage;
TempBuf *area;
PixelRegion srcPR;
gint x, y, w, h;
gint was_clipped;
guchar *do_fill = NULL;
gimage = gimp_item_get_image (GIMP_ITEM (drawable));
/* If the image type is indexed, don't smudge */
if (gimp_drawable_is_indexed (drawable))
return FALSE;
area = gimp_paint_core_get_paint_area (paint_core, drawable, 1.0);
if (!area)
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);
if (x != area->x || y != area->y || w != area->width || h != area->height)
was_clipped = TRUE;
else
was_clipped = FALSE;
/* When clipped, accum_data may contain pixels that map to
off-canvas pixels of the under-the-brush image, particulary
when the brush image contains an edge or corner of the
image. These off-canvas pixels are not a part of the current
composite, but may be composited in later generations. do_fill
contains a copy of the color of the pixel at the center of the
brush; assumed this is a reasonable choice for off- canvas pixels
that may enter into the blend */
if (was_clipped)
do_fill = gimp_drawable_get_color_at (drawable,
CLAMP ((gint) paint_core->cur_coords.x,
0, gimp_drawable_width (drawable) - 1),
CLAMP ((gint) paint_core->cur_coords.y,
0, gimp_drawable_height (drawable) - 1));
gimp_smudge_allocate_accum_buffer (w, h,
gimp_drawable_bytes (drawable),
do_fill);
accumPR.x = area->x - x;
accumPR.y = area->y - y;
accumPR.w = area->width;
accumPR.h = area->height;
accumPR.rowstride = accumPR.bytes * w;
accumPR.data = accum_data
+ accumPR.rowstride * accumPR.y
+ accumPR.x * 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, &accumPR);
accumPR.x = area->x - x;
accumPR.y = area->y - y;
accumPR.w = area->width;
accumPR.h = area->height;
accumPR.rowstride = accumPR.bytes * w;
accumPR.data = accum_data
+ accumPR.rowstride * accumPR.y
+ accumPR.x * accumPR.bytes;
if (do_fill)
g_free(do_fill);
return TRUE;
}
static void
gimp_smudge_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPressureOptions *pressure_options,
gdouble smudge_rate)
{
GimpImage *gimage;
GimpContext *context;
TempBuf *area;
PixelRegion srcPR, destPR, tempPR;
gdouble rate;
gdouble opacity;
gint x, y, w, h;
gimage = gimp_item_get_image (GIMP_ITEM (drawable));
context = gimp_get_current_context (gimage->gimp);
/* If the image type is indexed, don't smudge */
if (gimp_drawable_is_indexed (drawable))
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 (smudge_rate / 100.0 * paint_core->cur_coords.pressure * 2.0, 1.0);
else
rate = smudge_rate / 100.0;
/* The tempPR will be the built up buffer (for smudge) */
tempPR.bytes = accumPR.bytes;
tempPR.rowstride = accumPR.rowstride;
tempPR.x = area->x - x;
tempPR.y = area->y - y;
tempPR.w = area->width;
tempPR.h = area->height;
tempPR.data = accum_data +
tempPR.rowstride * tempPR.y + tempPR.x * tempPR.bytes;
/* The dest will be 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 * 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.bytes = accumPR.bytes;
tempPR.rowstride = accumPR.rowstride;
tempPR.x = area->x - x;
tempPR.y = area->y - y;
tempPR.w = area->width;
tempPR.h = area->height;
tempPR.data = accum_data
+ tempPR.rowstride * tempPR.y
+ tempPR.x * tempPR.bytes;
if (! gimp_drawable_has_alpha (drawable))
add_alpha_region (&tempPR, &destPR);
else
copy_region (&tempPR, &destPR);
opacity = gimp_context_get_opacity (context);
if (pressure_options->opacity)
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_OPACITY_OPAQUE,
(pressure_options->pressure ?
GIMP_BRUSH_PRESSURE : GIMP_BRUSH_SOFT),
1.0, GIMP_PAINT_INCREMENTAL);
}
static void
gimp_smudge_finish (GimpPaintCore *paint_core,
GimpDrawable *drawable)
{
if (accum_data)
{
g_free (accum_data);
accum_data = NULL;
}
}
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;
}
static void
gimp_smudge_allocate_accum_buffer (gint w,
gint h,
gint bytes,
guchar *do_fill)
{
/* Allocate the accumulation buffer */
accumPR.bytes = bytes;
accum_data = g_malloc (w * h * bytes);
if (do_fill != NULL)
{
/* guchar color[3] = {0,0,0}; */
accumPR.x = 0;
accumPR.y = 0;
accumPR.w = w;
accumPR.h = h;
accumPR.rowstride = accumPR.bytes * w;
accumPR.data = accum_data;
color_region (&accumPR, (const guchar*)do_fill);
}
}
/* paint options stuff */
#define SMUDGE_DEFAULT_RATE 50.0
GimpSmudgeOptions *
gimp_smudge_options_new (void)
{
GimpSmudgeOptions *options;
options = g_new0 (GimpSmudgeOptions, 1);
gimp_paint_options_init ((GimpPaintOptions *) options);
options->rate = options->rate_d = SMUDGE_DEFAULT_RATE;
return options;
}
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