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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 <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "libgimpmath/gimpmath.h"
#include "paint-types.h"
#include "gegl/gimp-gegl-loops.h"
#include "gegl/gimp-gegl-utils.h"
#include "core/gimp-palettes.h"
#include "core/gimpbrush.h"
#include "core/gimpbrush-header.h"
#include "core/gimpdrawable.h"
#include "core/gimpdynamics.h"
#include "core/gimpimage.h"
#include "core/gimppickable.h"
#include "core/gimpsymmetry.h"
#include "core/gimptempbuf.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,
GimpSymmetry *sym,
GimpPaintState paint_state,
guint32 time);
static gboolean gimp_smudge_start (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpSymmetry *sym);
static void gimp_smudge_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpSymmetry *sym);
static void gimp_smudge_accumulator_coords (GimpPaintCore *paint_core,
const GimpCoords *coords,
gint stroke,
gint *x,
gint *y);
static void gimp_smudge_accumulator_size (GimpPaintOptions *paint_options,
const GimpCoords *coords,
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_buffers)
{
GList *iter;
for (iter = smudge->accum_buffers; iter; iter = g_list_next (iter))
{
if (iter->data)
g_object_unref (iter->data);
}
g_list_free (smudge->accum_buffers);
smudge->accum_buffers = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_smudge_paint (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpSymmetry *sym,
GimpPaintState paint_state,
guint32 time)
{
GimpSmudge *smudge = GIMP_SMUDGE (paint_core);
switch (paint_state)
{
case GIMP_PAINT_STATE_INIT:
{
GimpContext *context = GIMP_CONTEXT (paint_options);
GimpSmudgeOptions *options = GIMP_SMUDGE_OPTIONS (paint_options);
GimpBrushCore *brush_core = GIMP_BRUSH_CORE (paint_core);
GimpDynamics *dynamics = gimp_context_get_dynamics (context);
/* Don't add to color history when
* 1. pure smudging (flow=0)
* 2. color is from gradient or pixmap brushes
*/
if (options->flow > 0.0 &&
! gimp_dynamics_is_output_enabled (dynamics, GIMP_DYNAMICS_OUTPUT_COLOR) &&
! (brush_core->brush && gimp_brush_get_pixmap (brush_core->brush)))
{
GimpRGB foreground;
gimp_context_get_foreground (context, &foreground);
gimp_palettes_add_color_history (context->gimp, &foreground);
}
}
break;
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, sym);
if (smudge->initialized)
gimp_smudge_motion (paint_core, drawable, paint_options, sym);
break;
case GIMP_PAINT_STATE_FINISH:
if (smudge->accum_buffers)
{
GList *iter;
for (iter = smudge->accum_buffers; iter; iter = g_list_next (iter))
{
if (iter->data)
g_object_unref (iter->data);
}
g_list_free (smudge->accum_buffers);
smudge->accum_buffers = NULL;
}
smudge->initialized = FALSE;
break;
default:
break;
}
}
static gboolean
gimp_smudge_start (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpSymmetry *sym)
{
GimpSmudge *smudge = GIMP_SMUDGE (paint_core);
GimpBrushCore *brush_core = GIMP_BRUSH_CORE (paint_core);
GimpSmudgeOptions *options = GIMP_SMUDGE_OPTIONS (paint_options);
GimpImage *image = gimp_item_get_image (GIMP_ITEM (drawable));
GimpPickable *dest_pickable;
GeglBuffer *pickable_buffer;
GeglBuffer *paint_buffer;
GimpCoords *coords;
gint dest_pickable_off_x;
gint dest_pickable_off_y;
gint paint_buffer_x;
gint paint_buffer_y;
gint accum_size;
gint n_strokes;
gint i;
gint x, y;
coords = gimp_symmetry_get_origin (sym);
gimp_brush_core_eval_transform_dynamics (brush_core,
drawable,
paint_options,
coords);
if (options->sample_merged)
{
dest_pickable = GIMP_PICKABLE (image);
gimp_item_get_offset (GIMP_ITEM (drawable),
&dest_pickable_off_x,
&dest_pickable_off_y);
}
else
{
dest_pickable = GIMP_PICKABLE (drawable);
dest_pickable_off_x = 0;
dest_pickable_off_y = 0;
}
pickable_buffer = gimp_pickable_get_buffer (dest_pickable);
n_strokes = gimp_symmetry_get_size (sym);
for (i = 0; i < n_strokes; i++)
{
GeglBuffer *accum_buffer;
coords = gimp_symmetry_get_coords (sym, i);
gimp_smudge_accumulator_size (paint_options, coords, &accum_size);
/* Allocate the accumulation buffer */
accum_buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0,
accum_size,
accum_size),
babl_format ("RGBA float"));
smudge->accum_buffers = g_list_prepend (smudge->accum_buffers,
accum_buffer);
/* adjust the x and y coordinates to the upper left corner of the
* accumulator
*/
paint_buffer = gimp_paint_core_get_paint_buffer (paint_core, drawable,
paint_options,
GIMP_LAYER_MODE_NORMAL,
coords,
&paint_buffer_x,
&paint_buffer_y,
NULL, NULL);
if (! paint_buffer)
continue;
gimp_smudge_accumulator_coords (paint_core, coords, 0, &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))
{
gfloat pixel[4];
GeglColor *color;
gint pick_x;
gint pick_y;
pick_x = CLAMP ((gint) coords->x + dest_pickable_off_x,
0,
gegl_buffer_get_width (pickable_buffer) - 1);
pick_y = CLAMP ((gint) coords->y + dest_pickable_off_y,
0,
gegl_buffer_get_height (pickable_buffer) - 1);
gimp_pickable_get_pixel_at (dest_pickable,
pick_x, pick_y,
babl_format ("RGBA float"),
pixel);
color = gegl_color_new (NULL);
gegl_color_set_pixel (color, babl_format ("RGBA float"), pixel);
gegl_buffer_set_color (accum_buffer, NULL, color);
g_object_unref (color);
}
/* copy the region under the original painthit. */
gimp_gegl_buffer_copy
(pickable_buffer,
GEGL_RECTANGLE (paint_buffer_x + dest_pickable_off_x,
paint_buffer_y + dest_pickable_off_y,
gegl_buffer_get_width (paint_buffer),
gegl_buffer_get_height (paint_buffer)),
GEGL_ABYSS_NONE,
accum_buffer,
GEGL_RECTANGLE (paint_buffer_x - x,
paint_buffer_y - y,
0, 0));
}
smudge->accum_buffers = g_list_reverse (smudge->accum_buffers);
return TRUE;
}
static void
gimp_smudge_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpSymmetry *sym)
{
GimpSmudge *smudge = GIMP_SMUDGE (paint_core);
GimpBrushCore *brush_core = GIMP_BRUSH_CORE (paint_core);
GimpSmudgeOptions *options = GIMP_SMUDGE_OPTIONS (paint_options);
GimpContext *context = GIMP_CONTEXT (paint_options);
GimpDynamics *dynamics = GIMP_BRUSH_CORE (paint_core)->dynamics;
GimpImage *image = gimp_item_get_image (GIMP_ITEM (drawable));
GimpPickable *dest_pickable;
GeglBuffer *paint_buffer;
gint dest_pickable_off_x;
gint dest_pickable_off_y;
gint paint_buffer_x;
gint paint_buffer_y;
gint paint_buffer_width;
gint paint_buffer_height;
/* brush dynamics */
gdouble fade_point;
gdouble opacity;
gdouble rate;
gdouble flow;
gdouble grad_point;
/* brush color */
GimpRGB brush_color;
GimpRGB *brush_color_ptr; /* whether use single color or pixmap */
/* accum buffer */
gint x, y;
GeglBuffer *accum_buffer;
/* other variables */
gdouble force;
GimpCoords *coords;
gint paint_width, paint_height;
gint n_strokes;
gint i;
if (options->sample_merged)
{
dest_pickable = GIMP_PICKABLE (image);
gimp_item_get_offset (GIMP_ITEM (drawable),
&dest_pickable_off_x,
&dest_pickable_off_y);
}
else
{
dest_pickable = GIMP_PICKABLE (drawable);
dest_pickable_off_x = 0;
dest_pickable_off_y = 0;
}
fade_point = gimp_paint_options_get_fade (paint_options, image,
paint_core->pixel_dist);
coords = gimp_symmetry_get_origin (sym);
opacity = gimp_dynamics_get_linear_value (dynamics,
GIMP_DYNAMICS_OUTPUT_OPACITY,
coords,
paint_options,
fade_point);
if (opacity == 0.0)
return;
gimp_brush_core_eval_transform_dynamics (brush_core,
drawable,
paint_options,
coords);
/* Get brush dynamic values other than opacity */
rate = ((options->rate / 100.0) *
gimp_dynamics_get_linear_value (dynamics,
GIMP_DYNAMICS_OUTPUT_RATE,
coords,
paint_options,
fade_point));
flow = ((options->flow / 100.0) *
gimp_dynamics_get_linear_value (dynamics,
GIMP_DYNAMICS_OUTPUT_FLOW,
coords,
paint_options,
fade_point));
grad_point = gimp_dynamics_get_linear_value (dynamics,
GIMP_DYNAMICS_OUTPUT_COLOR,
coords,
paint_options,
fade_point);
/* Get current gradient color, brush pixmap, or foreground color */
brush_color_ptr = &brush_color;
if (gimp_paint_options_get_gradient_color (paint_options, image,
grad_point,
paint_core->pixel_dist,
&brush_color))
{
/* No more processing needed */
}
else if (brush_core->brush && gimp_brush_get_pixmap (brush_core->brush))
{
brush_color_ptr = NULL;
}
else
{
gimp_context_get_foreground (context, &brush_color);
}
/* Convert to linear RGBA */
if (brush_color_ptr)
gimp_pickable_srgb_to_pixel (dest_pickable,
&brush_color,
babl_format ("RGBA double"),
&brush_color);
n_strokes = gimp_symmetry_get_size (sym);
for (i = 0; i < n_strokes; i++)
{
coords = gimp_symmetry_get_coords (sym, i);
gimp_brush_core_eval_transform_symmetry (brush_core, sym, i);
paint_buffer = gimp_paint_core_get_paint_buffer (paint_core, drawable,
paint_options,
GIMP_LAYER_MODE_NORMAL,
coords,
&paint_buffer_x,
&paint_buffer_y,
&paint_width,
&paint_height);
if (! paint_buffer)
continue;
paint_buffer_width = gegl_buffer_get_width (paint_buffer);
paint_buffer_height = gegl_buffer_get_height (paint_buffer);
/* Get the unclipped acumulator coordinates */
gimp_smudge_accumulator_coords (paint_core, coords, i, &x, &y);
accum_buffer = g_list_nth_data (smudge->accum_buffers, i);
/* Old smudge tool:
* 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),
*/
/* 2017/4/22: New smudge painting tool:
* Accum=rate*Accum + (1-rate)*I
* if brush_color_ptr!=NULL
* Paint=(1-flow)*Accum + flow*BrushColor
* else, draw brush pixmap on the paint_buffer and
* Paint=(1-flow)*Accum + flow*Paint
*
* For non-pixmap brushes, calculate blending in
* gimp_gegl_smudge_with_paint() instead of calling
* gegl_buffer_set_color() to reduce gegl's internal processing.
*/
if (! brush_color_ptr && flow > 0.0)
{
gimp_brush_core_color_area_with_pixmap (brush_core, drawable,
coords,
paint_buffer,
paint_buffer_x,
paint_buffer_y,
TRUE);
}
gimp_gegl_smudge_with_paint (accum_buffer,
GEGL_RECTANGLE (paint_buffer_x - x,
paint_buffer_y - y,
paint_buffer_width,
paint_buffer_height),
gimp_pickable_get_buffer (dest_pickable),
GEGL_RECTANGLE (paint_buffer_x +
dest_pickable_off_x,
paint_buffer_y +
dest_pickable_off_y,
paint_buffer_width,
paint_buffer_height),
brush_color_ptr,
paint_buffer,
options->no_erasing,
flow,
rate);
if (gimp_dynamics_is_output_enabled (dynamics, GIMP_DYNAMICS_OUTPUT_FORCE))
force = gimp_dynamics_get_linear_value (dynamics,
GIMP_DYNAMICS_OUTPUT_FORCE,
coords,
paint_options,
fade_point);
else
force = paint_options->brush_force;
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),
force,
GIMP_PAINT_INCREMENTAL);
}
}
static void
gimp_smudge_accumulator_coords (GimpPaintCore *paint_core,
const GimpCoords *coords,
gint stroke,
gint *x,
gint *y)
{
GimpSmudge *smudge = GIMP_SMUDGE (paint_core);
GeglBuffer *accum_buffer;
accum_buffer = g_list_nth_data (smudge->accum_buffers, stroke);
*x = (gint) coords->x - gegl_buffer_get_width (accum_buffer) / 2;
*y = (gint) coords->y - gegl_buffer_get_height (accum_buffer) / 2;
}
static void
gimp_smudge_accumulator_size (GimpPaintOptions *paint_options,
const GimpCoords *coords,
gint *accumulator_size)
{
gdouble max_view_scale = 1.0;
gdouble max_brush_size;
if (paint_options->brush_lock_to_view)
max_view_scale = MAX (coords->xscale, coords->yscale);
max_brush_size = MIN (paint_options->brush_size / max_view_scale,
GIMP_BRUSH_MAX_SIZE);
/* Note: the max brush mask size plus a border of 1 pixel and a
* little headroom
*/
*accumulator_size = ceil (sqrt (2 * SQR (max_brush_size + 1)) + 2);
}
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