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gimp/app/paint/gimpsmudge.c

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/* GIMP - The GNU 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.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 "gegl/gimp-gegl-utils.h"
#include "core/gimp.h"
#include "core/gimpbrush.h"
#include "core/gimpdrawable.h"
#include "core/gimpdynamics.h"
#include "core/gimpdynamicsoutput.h"
#include "core/gimpimage.h"
#include "core/gimppickable.h"
#include "gimpsmudge.h"
#include "gimpsmudgeoptions.h"
#include "gimp-intl.h"
static void gimp_smudge_finalize (GObject *object);
static void gimp_smudge_paint (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
const GimpCoords *coords,
GimpPaintState paint_state,
guint32 time);
static gboolean gimp_smudge_start (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
const GimpCoords *coords);
static void gimp_smudge_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
const GimpCoords *coords);
static void gimp_smudge_accumulator_coords (GimpPaintCore *paint_core,
const GimpCoords *coords,
gint *x,
gint *y);
static void gimp_smudge_accumulator_size (GimpPaintOptions *paint_options,
gint *accumulator_size);
G_DEFINE_TYPE (GimpSmudge, gimp_smudge, GIMP_TYPE_BRUSH_CORE)
#define parent_class gimp_smudge_parent_class
void
gimp_smudge_register (Gimp *gimp,
GimpPaintRegisterCallback callback)
{
(* callback) (gimp,
GIMP_TYPE_SMUDGE,
GIMP_TYPE_SMUDGE_OPTIONS,
"gimp-smudge",
_("Smudge"),
"gimp-tool-smudge");
}
static void
gimp_smudge_class_init (GimpSmudgeClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpPaintCoreClass *paint_core_class = GIMP_PAINT_CORE_CLASS (klass);
GimpBrushCoreClass *brush_core_class = GIMP_BRUSH_CORE_CLASS (klass);
object_class->finalize = gimp_smudge_finalize;
paint_core_class->paint = gimp_smudge_paint;
brush_core_class->handles_changing_brush = TRUE;
brush_core_class->handles_transforming_brush = TRUE;
brush_core_class->handles_dynamic_transforming_brush = TRUE;
}
static void
gimp_smudge_init (GimpSmudge *smudge)
{
}
static void
gimp_smudge_finalize (GObject *object)
{
GimpSmudge *smudge = GIMP_SMUDGE (object);
if (smudge->accum_buffer)
{
g_object_unref (smudge->accum_buffer);
smudge->accum_buffer = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_smudge_paint (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
const GimpCoords *coords,
GimpPaintState paint_state,
guint32 time)
{
GimpSmudge *smudge = GIMP_SMUDGE (paint_core);
switch (paint_state)
{
case GIMP_PAINT_STATE_MOTION:
/* initialization fails if the user starts outside the drawable */
if (! smudge->initialized)
smudge->initialized = gimp_smudge_start (paint_core, drawable,
paint_options, coords);
if (smudge->initialized)
gimp_smudge_motion (paint_core, drawable, paint_options, coords);
break;
case GIMP_PAINT_STATE_FINISH:
if (smudge->accum_buffer)
{
g_object_unref (smudge->accum_buffer);
smudge->accum_buffer = NULL;
}
smudge->initialized = FALSE;
break;
default:
break;
}
}
static gboolean
gimp_smudge_start (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
const GimpCoords *coords)
{
GimpSmudge *smudge = GIMP_SMUDGE (paint_core);
GeglBuffer *paint_buffer;
gint paint_buffer_x;
gint paint_buffer_y;
GimpTempBuf *accum_temp;
gint accum_size;
gint x, y;
if (gimp_drawable_is_indexed (drawable))
return FALSE;
paint_buffer = gimp_paint_core_get_paint_buffer (paint_core, drawable,
paint_options, coords,
&paint_buffer_x,
&paint_buffer_y);
if (! paint_buffer)
return FALSE;
gimp_smudge_accumulator_size (paint_options, &accum_size);
/* Allocate the accumulation buffer */
accum_temp = temp_buf_new (accum_size, accum_size,
gimp_drawable_get_format (drawable));
smudge->accum_buffer = gimp_temp_buf_create_buffer (accum_temp, TRUE);
/* adjust the x and y coordinates to the upper left corner of the
* accumulator
*/
gimp_smudge_accumulator_coords (paint_core, coords, &x, &y);
/* If clipped, prefill the smudge buffer with the color at the
* brush position.
*/
if (x != paint_buffer_x ||
y != paint_buffer_y ||
accum_size != gegl_buffer_get_width (paint_buffer) ||
accum_size != gegl_buffer_get_height (paint_buffer))
{
GimpRGB pixel;
GeglColor *color;
gimp_pickable_get_color_at (GIMP_PICKABLE (drawable),
CLAMP ((gint) coords->x,
0,
gimp_item_get_width (GIMP_ITEM (drawable)) - 1),
CLAMP ((gint) coords->y,
0,
gimp_item_get_height (GIMP_ITEM (drawable)) - 1),
&pixel);
color = gimp_gegl_color_new (&pixel);
gegl_buffer_set_color (smudge->accum_buffer, NULL, color);
g_object_unref (color);
}
/* copy the region under the original painthit. */
gegl_buffer_copy (gimp_drawable_get_buffer (drawable),
GEGL_RECTANGLE (paint_buffer_x,
paint_buffer_y,
gegl_buffer_get_width (paint_buffer),
gegl_buffer_get_height (paint_buffer)),
smudge->accum_buffer,
GEGL_RECTANGLE (paint_buffer_x - x,
paint_buffer_y - y,
0, 0));
return TRUE;
}
static void
gimp_smudge_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
const GimpCoords *coords)
{
GimpSmudge *smudge = GIMP_SMUDGE (paint_core);
GimpSmudgeOptions *options = GIMP_SMUDGE_OPTIONS (paint_options);
GimpContext *context = GIMP_CONTEXT (paint_options);
GimpDynamics *dynamics = GIMP_BRUSH_CORE (paint_core)->dynamics;
GimpDynamicsOutput *opacity_output;
GimpDynamicsOutput *rate_output;
GimpDynamicsOutput *hardness_output;
GimpImage *image;
GeglBuffer *paint_buffer;
gint paint_buffer_x;
gint paint_buffer_y;
PixelRegion srcPR, tempPR;
gdouble fade_point;
gdouble opacity;
gdouble rate;
gdouble dynamic_rate;
gint x, y;
gdouble hardness;
if (gimp_drawable_is_indexed (drawable))
return;
image = gimp_item_get_image (GIMP_ITEM (drawable));
opacity_output = gimp_dynamics_get_output (dynamics,
GIMP_DYNAMICS_OUTPUT_OPACITY);
fade_point = gimp_paint_options_get_fade (paint_options, image,
paint_core->pixel_dist);
opacity = gimp_dynamics_output_get_linear_value (opacity_output,
coords,
paint_options,
fade_point);
if (opacity == 0.0)
return;
paint_buffer = gimp_paint_core_get_paint_buffer (paint_core, drawable,
paint_options, coords,
&paint_buffer_x,
&paint_buffer_y);
if (! paint_buffer)
return;
/* Get the unclipped acumulator coordinates */
gimp_smudge_accumulator_coords (paint_core, coords, &x, &y);
/* srcPR will be the pixels under the current painthit from the drawable */
pixel_region_init (&srcPR, gimp_drawable_get_tiles (drawable),
paint_buffer_x,
paint_buffer_y,
gegl_buffer_get_width (paint_buffer),
gegl_buffer_get_height (paint_buffer), FALSE);
/* Enable dynamic rate */
rate_output = gimp_dynamics_get_output (dynamics,
GIMP_DYNAMICS_OUTPUT_RATE);
dynamic_rate = gimp_dynamics_output_get_linear_value (rate_output,
coords,
paint_options,
fade_point);
rate = (options->rate / 100.0) * dynamic_rate;
/* The tempPR will be the built up buffer (for smudge) */
pixel_region_init_temp_buf (&tempPR,
gimp_gegl_buffer_get_temp_buf (smudge->accum_buffer),
paint_buffer_x - x,
paint_buffer_y - y,
gegl_buffer_get_width (paint_buffer),
gegl_buffer_get_height (paint_buffer));
/* 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 (paint_area) is built as
* (Accum,1) (if no alpha),
*/
blend_region (&srcPR, &tempPR, &tempPR, ROUND (rate * 255.0));
gegl_buffer_copy (smudge->accum_buffer,
GEGL_RECTANGLE (paint_buffer_x - x,
paint_buffer_y - y,
gegl_buffer_get_width (paint_buffer),
gegl_buffer_get_height (paint_buffer)),
paint_buffer,
GEGL_RECTANGLE (0, 0, 0, 0));
hardness_output = gimp_dynamics_get_output (dynamics,
GIMP_DYNAMICS_OUTPUT_HARDNESS);
hardness = gimp_dynamics_output_get_linear_value (hardness_output,
coords,
paint_options,
fade_point);
gimp_brush_core_replace_canvas (GIMP_BRUSH_CORE (paint_core), drawable,
coords,
MIN (opacity, GIMP_OPACITY_OPAQUE),
gimp_context_get_opacity (context),
gimp_paint_options_get_brush_mode (paint_options),
hardness,
GIMP_PAINT_INCREMENTAL);
}
static void
gimp_smudge_accumulator_coords (GimpPaintCore *paint_core,
const GimpCoords *coords,
gint *x,
gint *y)
{
GimpSmudge *smudge = GIMP_SMUDGE (paint_core);
*x = (gint) coords->x - gegl_buffer_get_width (smudge->accum_buffer) / 2;
*y = (gint) coords->y - gegl_buffer_get_height (smudge->accum_buffer) / 2;
}
static void
gimp_smudge_accumulator_size (GimpPaintOptions *paint_options,
gint *accumulator_size)
{
/* Note: the max brush mask size plus a border of 1 pixel and a
* little headroom
*/
*accumulator_size = ceil (sqrt (2 * SQR (paint_options->brush_size + 1)) + 2);
}
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