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gimp/app/smudge.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 <stdlib.h>
#include <stdio.h>
#include "gdk/gdkkeysyms.h"
#include "appenv.h"
#include "drawable.h"
#include "errors.h"
#include "smudge.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/gimpintl.h"
#include "libgimp/gimpmath.h"
/* default defines */
#define SMUDGE_DEFAULT_RATE 50.0
/* the smudge structures */
typedef struct _SmudgeOptions SmudgeOptions;
struct _SmudgeOptions
{
PaintOptions paint_options;
gdouble rate;
gdouble rate_d;
GtkObject *rate_w;
};
static PixelRegion accumPR;
static guchar *accum_data;
/* the smudge tool options */
static SmudgeOptions * smudge_options = NULL;
/* local variables */
static gdouble non_gui_rate;
/* function prototypes */
static void smudge_motion (PaintCore *, PaintPressureOptions *,
gdouble, GimpDrawable *);
static gboolean smudge_init (PaintCore *, GimpDrawable *);
static void smudge_finish (PaintCore *, GimpDrawable *);
static void smudge_nonclipped_painthit_coords (PaintCore *paint_core,
gint *x,
gint *y,
gint *w,
gint *h);
static void smudge_allocate_accum_buffer (gint w,
gint h,
gint bytes,
guchar *do_fill);
static void
smudge_options_reset (void)
{
SmudgeOptions *options = smudge_options;
paint_options_reset ((PaintOptions *) options);
gtk_adjustment_set_value (GTK_ADJUSTMENT (options->rate_w), options->rate_d);
}
static SmudgeOptions *
smudge_options_new (void)
{
SmudgeOptions *options;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *label;
GtkWidget *scale;
/* the new smudge tool options structure */
options = g_new (SmudgeOptions, 1);
paint_options_init ((PaintOptions *) options,
SMUDGE,
smudge_options_reset);
options->rate = options->rate_d = SMUDGE_DEFAULT_RATE;
/* the main vbox */
vbox = ((ToolOptions *) options)->main_vbox;
/* the rate scale */
hbox = gtk_hbox_new (FALSE, 4);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
label = gtk_label_new (_("Rate:"));
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->rate_w =
gtk_adjustment_new (options->rate_d, 0.0, 100.0, 1.0, 1.0, 0.0);
scale = gtk_hscale_new (GTK_ADJUSTMENT (options->rate_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->rate_w), "value_changed",
GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
&options->rate);
gtk_widget_show (scale);
gtk_widget_show (hbox);
return options;
}
void *
smudge_paint_func (PaintCore *paint_core,
GimpDrawable *drawable,
int state)
{
/* initialization fails if the user starts outside the drawable */
static gboolean initialized = FALSE;
switch (state)
{
case INIT_PAINT:
initialized = smudge_init (paint_core, drawable);
break;
case MOTION_PAINT:
if (!initialized)
initialized = smudge_init (paint_core, drawable);
if (initialized)
smudge_motion (paint_core, smudge_options->paint_options.pressure_options,
smudge_options->rate, drawable);
break;
case FINISH_PAINT:
smudge_finish (paint_core, drawable);
initialized = FALSE;
break;
}
return NULL;
}
static void
smudge_finish (PaintCore *paint_core,
GimpDrawable *drawable)
{
if (accum_data)
{
g_free (accum_data);
accum_data = NULL;
}
}
static void
smudge_nonclipped_painthit_coords (PaintCore *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->curx - paint_core->brush->mask->width/2 - 1;
*y = (gint) paint_core->cury - paint_core->brush->mask->height/2 - 1;
*w = paint_core->brush->mask->width + 2;
*h = paint_core->brush->mask->height + 2;
}
static gboolean
smudge_init (PaintCore *paint_core,
GimpDrawable *drawable)
{
GImage *gimage;
TempBuf *area;
PixelRegion srcPR;
gint x, y, w, h;
gint was_clipped;
guchar *do_fill = NULL;
if (! (gimage = drawable_gimage (drawable)))
return FALSE;
/* If the image type is indexed, don't smudge */
if ((drawable_type (drawable) == INDEXED_GIMAGE) ||
(drawable_type (drawable) == INDEXEDA_GIMAGE))
return FALSE;
area = 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 */
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->curx, 0, gimp_drawable_width (drawable) - 1),
CLAMP ((gint) paint_core->cury, 0, gimp_drawable_height (drawable) - 1));
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, 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
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);
}
}
Tool *
tools_new_smudge (void)
{
Tool * tool;
PaintCore * private;
/* The tool options */
if (! smudge_options)
{
smudge_options = smudge_options_new ();
tools_register (SMUDGE, (ToolOptions *) smudge_options);
/* press all default buttons */
smudge_options_reset ();
}
tool = paint_core_new (SMUDGE);
/*tool->modifier_key_func = smudge_modifier_key_func;*/
private = (PaintCore *) tool->private;
private->paint_func = smudge_paint_func;
return tool;
}
void
tools_free_smudge (Tool *tool)
{
paint_core_free (tool);
}
static void
smudge_motion (PaintCore *paint_core,
PaintPressureOptions *pressure_options,
gdouble smudge_rate,
GimpDrawable *drawable)
{
GImage *gimage;
TempBuf * area;
PixelRegion srcPR, destPR, tempPR;
gdouble rate;
gint opacity;
gint x,y,w,h;
if (! (gimage = drawable_gimage (drawable)))
return;
/* If the image type is indexed, don't smudge */
if ((drawable_type (drawable) == INDEXED_GIMAGE) ||
(drawable_type (drawable) == INDEXEDA_GIMAGE))
return;
smudge_nonclipped_painthit_coords (paint_core, &x, &y, &w, &h);
/* Get the paint area */
/* Smudge won't scale! */
if (! (area = 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, 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->curpressure * 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 (!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 made paint area to the gimage*/
paint_core_replace_canvas (paint_core, drawable,
MIN (opacity, 255),
OPAQUE_OPACITY,
pressure_options->pressure ? PRESSURE : SOFT,
1.0, INCREMENTAL);
}
static void *
smudge_non_gui_paint_func (PaintCore *paint_core,
GimpDrawable *drawable,
int state)
{
smudge_motion (paint_core, &non_gui_pressure_options, non_gui_rate, drawable);
return NULL;
}
gboolean
smudge_non_gui_default (GimpDrawable *drawable,
int num_strokes,
double *stroke_array)
{
gdouble rate = SMUDGE_DEFAULT_RATE;
SmudgeOptions *options = smudge_options;
if (options)
rate = options->rate;
return smudge_non_gui (drawable, rate, num_strokes, stroke_array);
}
gboolean
smudge_non_gui (GimpDrawable *drawable,
gdouble rate,
int num_strokes,
double *stroke_array)
{
gint i;
if (paint_core_init (&non_gui_paint_core, drawable,
stroke_array[0], stroke_array[1]))
{
smudge_init (&non_gui_paint_core, drawable);
/* Set the paint core's paint func */
non_gui_paint_core.paint_func = smudge_non_gui_paint_func;
non_gui_rate = rate;
non_gui_paint_core.curx = non_gui_paint_core.startx =
non_gui_paint_core.lastx = stroke_array[0];
non_gui_paint_core.cury = non_gui_paint_core.starty =
non_gui_paint_core.lasty = stroke_array[1];
smudge_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 ();
smudge_finish (&non_gui_paint_core, drawable);
return TRUE;
}
else
return FALSE;
}
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