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PIKApp/app/paint/pikapaintcore.c

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Initial checkin of Pika from heckimp
2023-09-26 00:35:21 +02:00
/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
* Copyright (C) 2013 Daniel Sabo
*
* 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 <string.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "libpikabase/pikabase.h"
#include "libpikamath/pikamath.h"
#include "paint-types.h"
#include "operations/layer-modes/pika-layer-modes.h"
#include "gegl/pika-babl.h"
#include "gegl/pika-gegl-loops.h"
#include "gegl/pika-gegl-nodes.h"
#include "gegl/pika-gegl-utils.h"
#include "gegl/pikaapplicator.h"
#include "core/pika.h"
#include "core/pika-utils.h"
#include "core/pikachannel.h"
#include "core/pikaimage.h"
#include "core/pikaimage-guides.h"
#include "core/pikaimage-symmetry.h"
#include "core/pikaimage-undo.h"
#include "core/pikapickable.h"
#include "core/pikaprojection.h"
#include "core/pikasymmetry.h"
#include "core/pikatempbuf.h"
#include "pikapaintcore.h"
#include "pikapaintcoreundo.h"
#include "pikapaintcore-loops.h"
#include "pikapaintoptions.h"
#include "pikaairbrush.h"
#include "pika-intl.h"
#define STROKE_BUFFER_INIT_SIZE 2000
enum
{
PROP_0,
PROP_UNDO_DESC
};
/* local function prototypes */
static void pika_paint_core_finalize (GObject *object);
static void pika_paint_core_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_paint_core_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static gboolean pika_paint_core_real_start (PikaPaintCore *core,
GList *drawables,
PikaPaintOptions *paint_options,
const PikaCoords *coords,
GError **error);
static gboolean pika_paint_core_real_pre_paint (PikaPaintCore *core,
GList *drawables,
PikaPaintOptions *options,
PikaPaintState paint_state,
guint32 time);
static void pika_paint_core_real_paint (PikaPaintCore *core,
GList *drawables,
PikaPaintOptions *options,
PikaSymmetry *sym,
PikaPaintState paint_state,
guint32 time);
static void pika_paint_core_real_post_paint (PikaPaintCore *core,
GList *drawables,
PikaPaintOptions *options,
PikaPaintState paint_state,
guint32 time);
static void pika_paint_core_real_interpolate (PikaPaintCore *core,
GList *drawables,
PikaPaintOptions *options,
guint32 time);
static GeglBuffer *
pika_paint_core_real_get_paint_buffer (PikaPaintCore *core,
PikaDrawable *drawable,
PikaPaintOptions *options,
PikaLayerMode paint_mode,
const PikaCoords *coords,
gint *paint_buffer_x,
gint *paint_buffer_y,
gint *paint_width,
gint *paint_height);
static PikaUndo* pika_paint_core_real_push_undo (PikaPaintCore *core,
PikaImage *image,
const gchar *undo_desc);
G_DEFINE_TYPE (PikaPaintCore, pika_paint_core, PIKA_TYPE_OBJECT)
#define parent_class pika_paint_core_parent_class
static gint global_core_ID = 1;
static void
pika_paint_core_class_init (PikaPaintCoreClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = pika_paint_core_finalize;
object_class->set_property = pika_paint_core_set_property;
object_class->get_property = pika_paint_core_get_property;
klass->start = pika_paint_core_real_start;
klass->pre_paint = pika_paint_core_real_pre_paint;
klass->paint = pika_paint_core_real_paint;
klass->post_paint = pika_paint_core_real_post_paint;
klass->interpolate = pika_paint_core_real_interpolate;
klass->get_paint_buffer = pika_paint_core_real_get_paint_buffer;
klass->push_undo = pika_paint_core_real_push_undo;
g_object_class_install_property (object_class, PROP_UNDO_DESC,
g_param_spec_string ("undo-desc", NULL, NULL,
_("Paint"),
PIKA_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
}
static void
pika_paint_core_init (PikaPaintCore *core)
{
core->ID = global_core_ID++;
core->undo_buffers = g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL, g_object_unref);
}
static void
pika_paint_core_finalize (GObject *object)
{
PikaPaintCore *core = PIKA_PAINT_CORE (object);
pika_paint_core_cleanup (core);
g_clear_pointer (&core->undo_desc, g_free);
g_hash_table_unref (core->undo_buffers);
if (core->applicators)
g_hash_table_unref (core->applicators);
if (core->stroke_buffer)
{
g_array_free (core->stroke_buffer, TRUE);
core->stroke_buffer = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
pika_paint_core_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaPaintCore *core = PIKA_PAINT_CORE (object);
switch (property_id)
{
case PROP_UNDO_DESC:
g_free (core->undo_desc);
core->undo_desc = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_paint_core_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaPaintCore *core = PIKA_PAINT_CORE (object);
switch (property_id)
{
case PROP_UNDO_DESC:
g_value_set_string (value, core->undo_desc);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gboolean
pika_paint_core_real_start (PikaPaintCore *core,
GList *drawables,
PikaPaintOptions *paint_options,
const PikaCoords *coords,
GError **error)
{
return TRUE;
}
static gboolean
pika_paint_core_real_pre_paint (PikaPaintCore *core,
GList *drawables,
PikaPaintOptions *paint_options,
PikaPaintState paint_state,
guint32 time)
{
return TRUE;
}
static void
pika_paint_core_real_paint (PikaPaintCore *core,
GList *drawables,
PikaPaintOptions *paint_options,
PikaSymmetry *sym,
PikaPaintState paint_state,
guint32 time)
{
}
static void
pika_paint_core_real_post_paint (PikaPaintCore *core,
GList *drawables,
PikaPaintOptions *paint_options,
PikaPaintState paint_state,
guint32 time)
{
}
static void
pika_paint_core_real_interpolate (PikaPaintCore *core,
GList *drawables,
PikaPaintOptions *paint_options,
guint32 time)
{
pika_paint_core_paint (core, drawables, paint_options,
PIKA_PAINT_STATE_MOTION, time);
core->last_coords = core->cur_coords;
}
static GeglBuffer *
pika_paint_core_real_get_paint_buffer (PikaPaintCore *core,
PikaDrawable *drawable,
PikaPaintOptions *paint_options,
PikaLayerMode paint_mode,
const PikaCoords *coords,
gint *paint_buffer_x,
gint *paint_buffer_y,
gint *paint_width,
gint *paint_height)
{
return NULL;
}
static PikaUndo *
pika_paint_core_real_push_undo (PikaPaintCore *core,
PikaImage *image,
const gchar *undo_desc)
{
return pika_image_undo_push (image, PIKA_TYPE_PAINT_CORE_UNDO,
PIKA_UNDO_PAINT, undo_desc,
0,
"paint-core", core,
NULL);
}
/* public functions */
void
pika_paint_core_paint (PikaPaintCore *core,
GList *drawables,
PikaPaintOptions *paint_options,
PikaPaintState paint_state,
guint32 time)
{
PikaPaintCoreClass *core_class;
g_return_if_fail (PIKA_IS_PAINT_CORE (core));
g_return_if_fail (drawables != NULL);
g_return_if_fail (PIKA_IS_PAINT_OPTIONS (paint_options));
core_class = PIKA_PAINT_CORE_GET_CLASS (core);
if (core_class->pre_paint (core, drawables,
paint_options,
paint_state, time))
{
PikaSymmetry *sym;
PikaImage *image;
image = pika_item_get_image (PIKA_ITEM (drawables->data));
if (paint_state == PIKA_PAINT_STATE_MOTION)
{
/* Save coordinates for pika_paint_core_interpolate() */
core->last_paint.x = core->cur_coords.x;
core->last_paint.y = core->cur_coords.y;
}
sym = g_object_ref (pika_image_get_active_symmetry (image));
pika_symmetry_set_origin (sym, drawables->data, &core->cur_coords);
core_class->paint (core, drawables,
paint_options,
sym, paint_state, time);
pika_symmetry_clear_origin (sym);
g_object_unref (sym);
core_class->post_paint (core, drawables,
paint_options,
paint_state, time);
}
}
gboolean
pika_paint_core_start (PikaPaintCore *core,
GList *drawables,
PikaPaintOptions *paint_options,
const PikaCoords *coords,
GError **error)
{
PikaImage *image;
PikaChannel *mask;
gint max_width = 0;
gint max_height = 0;
g_return_val_if_fail (PIKA_IS_PAINT_CORE (core), FALSE);
g_return_val_if_fail (g_list_length (drawables) > 0, FALSE);
g_return_val_if_fail (PIKA_IS_PAINT_OPTIONS (paint_options), FALSE);
g_return_val_if_fail (coords != NULL, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
for (GList *iter = drawables; iter; iter = iter->next)
g_return_val_if_fail (pika_item_is_attached (iter->data), FALSE);
image = pika_item_get_image (PIKA_ITEM (drawables->data));
if (core->stroke_buffer)
{
g_array_free (core->stroke_buffer, TRUE);
core->stroke_buffer = NULL;
}
core->stroke_buffer = g_array_sized_new (TRUE, TRUE,
sizeof (PikaCoords),
STROKE_BUFFER_INIT_SIZE);
/* remember the last stroke's endpoint for later undo */
core->start_coords = core->last_coords;
core->cur_coords = *coords;
if (paint_options->use_applicator)
core->applicators = g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL, g_object_unref);
else
core->applicators = NULL;
if (! PIKA_PAINT_CORE_GET_CLASS (core)->start (core, drawables,
paint_options,
coords, error))
{
return FALSE;
}
/* Set the image pickable */
if (! core->show_all)
core->image_pickable = PIKA_PICKABLE (image);
else
core->image_pickable = PIKA_PICKABLE (pika_image_get_projection (image));
/* Allocate the saved proj structure */
g_clear_object (&core->saved_proj_buffer);
if (core->use_saved_proj)
{
GeglBuffer *buffer = pika_pickable_get_buffer (core->image_pickable);
core->saved_proj_buffer = pika_gegl_buffer_dup (buffer);
}
for (GList *iter = drawables; iter; iter = iter->next)
{
/* Allocate the undo structures */
g_hash_table_insert (core->undo_buffers, iter->data,
pika_gegl_buffer_dup (pika_drawable_get_buffer (iter->data)));
max_width = MAX (max_width, pika_item_get_width (iter->data));
max_height = MAX (max_height, pika_item_get_height (iter->data));
}
/* Allocate the canvas blocks structure */
if (core->canvas_buffer)
g_object_unref (core->canvas_buffer);
core->canvas_buffer =
gegl_buffer_new (GEGL_RECTANGLE (0, 0, max_width, max_height),
babl_format ("Y float"));
/* Get the initial undo extents */
core->x1 = core->x2 = core->cur_coords.x;
core->y1 = core->y2 = core->cur_coords.y;
core->last_paint.x = -1e6;
core->last_paint.y = -1e6;
mask = pika_image_get_mask (image);
/* don't apply the mask to itself and don't apply an empty mask */
if (! pika_channel_is_empty (mask) &&
(g_list_length (drawables) > 1 || PIKA_DRAWABLE (mask) != drawables->data))
{
GeglBuffer *mask_buffer;
mask_buffer = pika_drawable_get_buffer (PIKA_DRAWABLE (mask));
core->mask_buffer = g_object_ref (mask_buffer);
}
else
{
core->mask_buffer = NULL;
}
if (paint_options->use_applicator)
{
for (GList *iter = drawables; iter; iter = iter->next)
{
PikaApplicator *applicator;
applicator = pika_applicator_new (NULL);
g_hash_table_insert (core->applicators, iter->data, applicator);
if (core->mask_buffer)
{
gint offset_x;
gint offset_y;
pika_applicator_set_mask_buffer (applicator,
core->mask_buffer);
pika_item_get_offset (iter->data, &offset_x, &offset_y);
pika_applicator_set_mask_offset (applicator, -offset_x, -offset_y);
}
pika_applicator_set_affect (applicator,
pika_drawable_get_active_mask (iter->data));
pika_applicator_set_dest_buffer (applicator,
pika_drawable_get_buffer (iter->data));
}
}
/* Freeze the drawable preview so that it isn't constantly updated. */
for (GList *iter = drawables; iter; iter = iter->next)
pika_viewable_preview_freeze (PIKA_VIEWABLE (iter->data));
return TRUE;
}
void
pika_paint_core_finish (PikaPaintCore *core,
GList *drawables,
gboolean push_undo)
{
PikaImage *image;
gboolean undo_group_started = FALSE;
g_return_if_fail (PIKA_IS_PAINT_CORE (core));
if (core->applicators)
{
g_hash_table_unref (core->applicators);
core->applicators = NULL;
}
if (core->stroke_buffer)
{
g_array_free (core->stroke_buffer, TRUE);
core->stroke_buffer = NULL;
}
g_clear_object (&core->mask_buffer);
image = pika_item_get_image (PIKA_ITEM (drawables->data));
for (GList *iter = drawables; iter; iter = iter->next)
{
/* Determine if any part of the image has been altered--
* if nothing has, then just go to the next drawable...
*/
if ((core->x2 == core->x1) || (core->y2 == core->y1))
{
pika_viewable_preview_thaw (PIKA_VIEWABLE (iter->data));
continue;
}
if (push_undo)
{
GeglBuffer *undo_buffer;
GeglBuffer *buffer;
GeglRectangle rect;
if (! g_hash_table_steal_extended (core->undo_buffers, iter->data,
NULL, (gpointer*) &undo_buffer))
{
g_critical ("%s: missing undo buffer for '%s'.",
G_STRFUNC, pika_object_get_name (iter->data));
continue;
}
pika_rectangle_intersect (core->x1, core->y1,
core->x2 - core->x1, core->y2 - core->y1,
0, 0,
pika_item_get_width (PIKA_ITEM (iter->data)),
pika_item_get_height (PIKA_ITEM (iter->data)),
&rect.x, &rect.y, &rect.width, &rect.height);
gegl_rectangle_align_to_buffer (&rect, &rect, undo_buffer,
GEGL_RECTANGLE_ALIGNMENT_SUPERSET);
if (! undo_group_started)
{
pika_image_undo_group_start (image, PIKA_UNDO_GROUP_PAINT,
core->undo_desc);
undo_group_started = TRUE;
}
PIKA_PAINT_CORE_GET_CLASS (core)->push_undo (core, image, NULL);
buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0, rect.width, rect.height),
pika_drawable_get_format (iter->data));
pika_gegl_buffer_copy (undo_buffer,
&rect,
GEGL_ABYSS_NONE,
buffer,
GEGL_RECTANGLE (0, 0, 0, 0));
pika_drawable_push_undo (iter->data, NULL,
buffer, rect.x, rect.y, rect.width, rect.height);
g_object_unref (buffer);
g_object_unref (undo_buffer);
}
pika_viewable_preview_thaw (PIKA_VIEWABLE (iter->data));
}
core->image_pickable = NULL;
g_clear_object (&core->saved_proj_buffer);
if (undo_group_started)
pika_image_undo_group_end (image);
}
void
pika_paint_core_cancel (PikaPaintCore *core,
GList *drawables)
{
gint x, y;
gint width, height;
g_return_if_fail (PIKA_IS_PAINT_CORE (core));
/* Determine if any part of the image has been altered--
* if nothing has, then just return...
*/
if ((core->x2 == core->x1) || (core->y2 == core->y1))
return;
for (GList *iter = drawables; iter; iter = iter->next)
{
if (pika_rectangle_intersect (core->x1, core->y1,
core->x2 - core->x1,
core->y2 - core->y1,
0, 0,
pika_item_get_width (PIKA_ITEM (iter->data)),
pika_item_get_height (PIKA_ITEM (iter->data)),
&x, &y, &width, &height))
{
GeglBuffer *undo_buffer;
GeglRectangle rect;
if (! g_hash_table_steal_extended (core->undo_buffers, iter->data,
NULL, (gpointer*) &undo_buffer))
{
g_critical ("%s: missing undo buffer for '%s'.",
G_STRFUNC, pika_object_get_name (iter->data));
continue;
}
gegl_rectangle_align_to_buffer (&rect,
GEGL_RECTANGLE (x, y, width, height),
pika_drawable_get_buffer (iter->data),
GEGL_RECTANGLE_ALIGNMENT_SUPERSET);
pika_gegl_buffer_copy (undo_buffer,
&rect,
GEGL_ABYSS_NONE,
pika_drawable_get_buffer (iter->data),
&rect);
g_object_unref (undo_buffer);
}
pika_drawable_update (iter->data, x, y, width, height);
pika_viewable_preview_thaw (PIKA_VIEWABLE (iter->data));
}
g_clear_object (&core->saved_proj_buffer);
}
void
pika_paint_core_cleanup (PikaPaintCore *core)
{
g_return_if_fail (PIKA_IS_PAINT_CORE (core));
g_hash_table_remove_all (core->undo_buffers);
g_clear_object (&core->saved_proj_buffer);
g_clear_object (&core->canvas_buffer);
g_clear_object (&core->paint_buffer);
}
void
pika_paint_core_interpolate (PikaPaintCore *core,
GList *drawables,
PikaPaintOptions *paint_options,
const PikaCoords *coords,
guint32 time)
{
g_return_if_fail (PIKA_IS_PAINT_CORE (core));
g_return_if_fail (drawables != NULL);
g_return_if_fail (PIKA_IS_PAINT_OPTIONS (paint_options));
g_return_if_fail (coords != NULL);
core->cur_coords = *coords;
PIKA_PAINT_CORE_GET_CLASS (core)->interpolate (core, drawables,
paint_options, time);
}
void
pika_paint_core_set_show_all (PikaPaintCore *core,
gboolean show_all)
{
g_return_if_fail (PIKA_IS_PAINT_CORE (core));
core->show_all = show_all;
}
gboolean
pika_paint_core_get_show_all (PikaPaintCore *core)
{
g_return_val_if_fail (PIKA_IS_PAINT_CORE (core), FALSE);
return core->show_all;
}
void
pika_paint_core_set_current_coords (PikaPaintCore *core,
const PikaCoords *coords)
{
g_return_if_fail (PIKA_IS_PAINT_CORE (core));
g_return_if_fail (coords != NULL);
core->cur_coords = *coords;
}
void
pika_paint_core_get_current_coords (PikaPaintCore *core,
PikaCoords *coords)
{
g_return_if_fail (PIKA_IS_PAINT_CORE (core));
g_return_if_fail (coords != NULL);
*coords = core->cur_coords;
}
void
pika_paint_core_set_last_coords (PikaPaintCore *core,
const PikaCoords *coords)
{
g_return_if_fail (PIKA_IS_PAINT_CORE (core));
g_return_if_fail (coords != NULL);
core->last_coords = *coords;
}
void
pika_paint_core_get_last_coords (PikaPaintCore *core,
PikaCoords *coords)
{
g_return_if_fail (PIKA_IS_PAINT_CORE (core));
g_return_if_fail (coords != NULL);
*coords = core->last_coords;
}
/**
* pika_paint_core_round_line:
* @core: the #PikaPaintCore
* @options: the #PikaPaintOptions to use
* @constrain_15_degrees: the modifier state
* @constrain_offset_angle: the angle by which to offset the lines, in degrees
* @constrain_xres: the horizontal resolution
* @constrain_yres: the vertical resolution
*
* Adjusts core->last_coords and core_cur_coords in preparation to
* drawing a straight line. If @center_pixels is TRUE the endpoints
* get pushed to the center of the pixels. This avoids artifacts
* for e.g. the hard mode. The rounding of the slope to 15 degree
* steps if ctrl is pressed happens, as does rounding the start and
* end coordinates (which may be fractional in high zoom modes) to
* the center of pixels.
**/
void
pika_paint_core_round_line (PikaPaintCore *core,
PikaPaintOptions *paint_options,
gboolean constrain_15_degrees,
gdouble constrain_offset_angle,
gdouble constrain_xres,
gdouble constrain_yres)
{
g_return_if_fail (PIKA_IS_PAINT_CORE (core));
g_return_if_fail (PIKA_IS_PAINT_OPTIONS (paint_options));
if (pika_paint_options_get_brush_mode (paint_options) == PIKA_BRUSH_HARD)
{
core->last_coords.x = floor (core->last_coords.x) + 0.5;
core->last_coords.y = floor (core->last_coords.y) + 0.5;
core->cur_coords.x = floor (core->cur_coords.x ) + 0.5;
core->cur_coords.y = floor (core->cur_coords.y ) + 0.5;
}
if (constrain_15_degrees)
pika_constrain_line (core->last_coords.x, core->last_coords.y,
&core->cur_coords.x, &core->cur_coords.y,
PIKA_CONSTRAIN_LINE_15_DEGREES,
constrain_offset_angle,
constrain_xres, constrain_yres);
}
/* protected functions */
GeglBuffer *
pika_paint_core_get_paint_buffer (PikaPaintCore *core,
PikaDrawable *drawable,
PikaPaintOptions *paint_options,
PikaLayerMode paint_mode,
const PikaCoords *coords,
gint *paint_buffer_x,
gint *paint_buffer_y,
gint *paint_width,
gint *paint_height)
{
GeglBuffer *paint_buffer;
g_return_val_if_fail (PIKA_IS_PAINT_CORE (core), NULL);
g_return_val_if_fail (PIKA_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (pika_item_is_attached (PIKA_ITEM (drawable)), NULL);
g_return_val_if_fail (PIKA_IS_PAINT_OPTIONS (paint_options), NULL);
g_return_val_if_fail (coords != NULL, NULL);
g_return_val_if_fail (paint_buffer_x != NULL, NULL);
g_return_val_if_fail (paint_buffer_y != NULL, NULL);
paint_buffer =
PIKA_PAINT_CORE_GET_CLASS (core)->get_paint_buffer (core, drawable,
paint_options,
paint_mode,
coords,
paint_buffer_x,
paint_buffer_y,
paint_width,
paint_height);
core->paint_buffer_x = *paint_buffer_x;
core->paint_buffer_y = *paint_buffer_y;
return paint_buffer;
}
PikaPickable *
pika_paint_core_get_image_pickable (PikaPaintCore *core)
{
g_return_val_if_fail (PIKA_IS_PAINT_CORE (core), NULL);
g_return_val_if_fail (core->image_pickable != NULL, NULL);
return core->image_pickable;
}
GeglBuffer *
pika_paint_core_get_orig_image (PikaPaintCore *core,
PikaDrawable *drawable)
{
GeglBuffer *undo_buffer;
g_return_val_if_fail (PIKA_IS_PAINT_CORE (core), NULL);
undo_buffer = g_hash_table_lookup (core->undo_buffers, drawable);
g_return_val_if_fail (undo_buffer != NULL, NULL);
return undo_buffer;
}
GeglBuffer *
pika_paint_core_get_orig_proj (PikaPaintCore *core)
{
g_return_val_if_fail (PIKA_IS_PAINT_CORE (core), NULL);
g_return_val_if_fail (core->saved_proj_buffer != NULL, NULL);
return core->saved_proj_buffer;
}
void
pika_paint_core_paste (PikaPaintCore *core,
const PikaTempBuf *paint_mask,
gint paint_mask_offset_x,
gint paint_mask_offset_y,
PikaDrawable *drawable,
gdouble paint_opacity,
gdouble image_opacity,
PikaLayerMode paint_mode,
PikaPaintApplicationMode mode)
{
gint width = gegl_buffer_get_width (core->paint_buffer);
gint height = gegl_buffer_get_height (core->paint_buffer);
PikaComponentMask affect = pika_drawable_get_active_mask (drawable);
GeglBuffer *undo_buffer;
undo_buffer = g_hash_table_lookup (core->undo_buffers, drawable);
if (! affect)
return;
if (core->applicators)
{
PikaApplicator *applicator;
applicator = g_hash_table_lookup (core->applicators, drawable);
/* If the mode is CONSTANT:
* combine the canvas buffer and the paint mask to the paint buffer
*/
if (mode == PIKA_PAINT_CONSTANT)
{
/* Some tools (ink) paint the mask to paint_core->canvas_buffer
* directly. Don't need to copy it in this case.
*/
if (paint_mask != NULL)
{
GeglBuffer *paint_mask_buffer =
pika_temp_buf_create_buffer ((PikaTempBuf *) paint_mask);
pika_gegl_combine_mask_weird (paint_mask_buffer,
GEGL_RECTANGLE (paint_mask_offset_x,
paint_mask_offset_y,
width, height),
core->canvas_buffer,
GEGL_RECTANGLE (core->paint_buffer_x,
core->paint_buffer_y,
width, height),
paint_opacity,
PIKA_IS_AIRBRUSH (core));
g_object_unref (paint_mask_buffer);
}
pika_gegl_apply_mask (core->canvas_buffer,
GEGL_RECTANGLE (core->paint_buffer_x,
core->paint_buffer_y,
width, height),
core->paint_buffer,
GEGL_RECTANGLE (0, 0, width, height),
1.0);
pika_applicator_set_src_buffer (applicator, undo_buffer);
}
/* Otherwise:
* combine the paint mask to the paint buffer directly
*/
else
{
GeglBuffer *paint_mask_buffer =
pika_temp_buf_create_buffer ((PikaTempBuf *) paint_mask);
pika_gegl_apply_mask (paint_mask_buffer,
GEGL_RECTANGLE (paint_mask_offset_x,
paint_mask_offset_y,
width, height),
core->paint_buffer,
GEGL_RECTANGLE (0, 0, width, height),
paint_opacity);
g_object_unref (paint_mask_buffer);
pika_applicator_set_src_buffer (applicator,
pika_drawable_get_buffer (drawable));
}
pika_applicator_set_apply_buffer (applicator,
core->paint_buffer);
pika_applicator_set_apply_offset (applicator,
core->paint_buffer_x,
core->paint_buffer_y);
pika_applicator_set_opacity (applicator, image_opacity);
pika_applicator_set_mode (applicator, paint_mode,
PIKA_LAYER_COLOR_SPACE_AUTO,
PIKA_LAYER_COLOR_SPACE_AUTO,
pika_layer_mode_get_paint_composite_mode (paint_mode));
/* apply the paint area to the image */
pika_applicator_blit (applicator,
GEGL_RECTANGLE (core->paint_buffer_x,
core->paint_buffer_y,
width, height));
}
else
{
PikaPaintCoreLoopsParams params = {};
PikaPaintCoreLoopsAlgorithm algorithms = PIKA_PAINT_CORE_LOOPS_ALGORITHM_NONE;
params.paint_buf = pika_gegl_buffer_get_temp_buf (core->paint_buffer);
params.paint_buf_offset_x = core->paint_buffer_x;
params.paint_buf_offset_y = core->paint_buffer_y;
if (! params.paint_buf)
return;
params.dest_buffer = pika_drawable_get_buffer (drawable);
if (mode == PIKA_PAINT_CONSTANT)
{
params.canvas_buffer = core->canvas_buffer;
/* This step is skipped by the ink tool, which writes
* directly to canvas_buffer
*/
if (paint_mask != NULL)
{
/* Mix paint mask and canvas_buffer */
params.paint_mask = paint_mask;
params.paint_mask_offset_x = paint_mask_offset_x;
params.paint_mask_offset_y = paint_mask_offset_y;
params.stipple = PIKA_IS_AIRBRUSH (core);
params.paint_opacity = paint_opacity;
algorithms |= PIKA_PAINT_CORE_LOOPS_ALGORITHM_COMBINE_PAINT_MASK_TO_CANVAS_BUFFER;
}
/* Write canvas_buffer to paint_buf */
algorithms |= PIKA_PAINT_CORE_LOOPS_ALGORITHM_CANVAS_BUFFER_TO_COMP_MASK;
/* undo buf -> paint_buf -> dest_buffer */
params.src_buffer = undo_buffer;
}
else
{
g_return_if_fail (paint_mask);
/* Write paint_mask to paint_buf, does not modify canvas_buffer */
params.paint_mask = paint_mask;
params.paint_mask_offset_x = paint_mask_offset_x;
params.paint_mask_offset_y = paint_mask_offset_y;
params.paint_opacity = paint_opacity;
algorithms |= PIKA_PAINT_CORE_LOOPS_ALGORITHM_PAINT_MASK_TO_COMP_MASK;
/* dest_buffer -> paint_buf -> dest_buffer */
params.src_buffer = params.dest_buffer;
}
pika_item_get_offset (PIKA_ITEM (drawable),
&params.mask_offset_x, &params.mask_offset_y);
params.mask_offset_x = -params.mask_offset_x;
params.mask_offset_y = -params.mask_offset_y;
params.mask_buffer = core->mask_buffer;
params.image_opacity = image_opacity;
params.paint_mode = paint_mode;
algorithms |= PIKA_PAINT_CORE_LOOPS_ALGORITHM_DO_LAYER_BLEND;
if (affect != PIKA_COMPONENT_MASK_ALL)
{
params.affect = affect;
algorithms |= PIKA_PAINT_CORE_LOOPS_ALGORITHM_MASK_COMPONENTS;
}
pika_paint_core_loops_process (&params, algorithms);
}
/* Update the undo extents */
core->x1 = MIN (core->x1, core->paint_buffer_x);
core->y1 = MIN (core->y1, core->paint_buffer_y);
core->x2 = MAX (core->x2, core->paint_buffer_x + width);
core->y2 = MAX (core->y2, core->paint_buffer_y + height);
/* Update the drawable */
pika_drawable_update (drawable,
core->paint_buffer_x,
core->paint_buffer_y,
width, height);
}
/* This works similarly to pika_paint_core_paste. However, instead of
* combining the canvas to the paint core drawable using one of the
* combination modes, it uses a "replace" mode (i.e. transparent
* pixels in the canvas erase the paint core drawable).
* When not drawing on alpha-enabled images, it just paints using
* NORMAL mode.
*/
void
pika_paint_core_replace (PikaPaintCore *core,
const PikaTempBuf *paint_mask,
gint paint_mask_offset_x,
gint paint_mask_offset_y,
PikaDrawable *drawable,
gdouble paint_opacity,
gdouble image_opacity,
PikaPaintApplicationMode mode)
{
GeglBuffer *undo_buffer;
gint width, height;
PikaComponentMask affect;
if (! pika_drawable_has_alpha (drawable))
{
pika_paint_core_paste (core, paint_mask,
paint_mask_offset_x,
paint_mask_offset_y,
drawable,
paint_opacity,
image_opacity,
PIKA_LAYER_MODE_NORMAL,
mode);
return;
}
width = gegl_buffer_get_width (core->paint_buffer);
height = gegl_buffer_get_height (core->paint_buffer);
affect = pika_drawable_get_active_mask (drawable);
if (! affect)
return;
undo_buffer = g_hash_table_lookup (core->undo_buffers, drawable);
if (core->applicators)
{
PikaApplicator *applicator;
GeglRectangle mask_rect;
GeglBuffer *mask_buffer;
gint offset_x;
gint offset_y;
applicator = g_hash_table_lookup (core->applicators, drawable);
/* If the mode is CONSTANT:
* combine the paint mask to the canvas buffer, and use it as the mask
* buffer
*/
if (mode == PIKA_PAINT_CONSTANT)
{
/* Some tools (ink) paint the mask to paint_core->canvas_buffer
* directly. Don't need to copy it in this case.
*/
if (paint_mask != NULL)
{
GeglBuffer *paint_mask_buffer =
pika_temp_buf_create_buffer ((PikaTempBuf *) paint_mask);
pika_gegl_combine_mask_weird (paint_mask_buffer,
GEGL_RECTANGLE (paint_mask_offset_x,
paint_mask_offset_y,
width, height),
core->canvas_buffer,
GEGL_RECTANGLE (core->paint_buffer_x,
core->paint_buffer_y,
width, height),
paint_opacity,
PIKA_IS_AIRBRUSH (core));
g_object_unref (paint_mask_buffer);
}
mask_buffer = g_object_ref (core->canvas_buffer);
mask_rect = *GEGL_RECTANGLE (core->paint_buffer_x,
core->paint_buffer_y,
width, height);
pika_applicator_set_src_buffer (applicator, undo_buffer);
}
/* Otherwise:
* use the paint mask as the mask buffer directly
*/
else
{
mask_buffer =
pika_temp_buf_create_buffer ((PikaTempBuf *) paint_mask);
mask_rect = *GEGL_RECTANGLE (paint_mask_offset_x,
paint_mask_offset_y,
width, height);
pika_applicator_set_src_buffer (applicator,
pika_drawable_get_buffer (drawable));
}
pika_item_get_offset (PIKA_ITEM (drawable), &offset_x, &offset_y);
if (core->mask_buffer)
{
GeglBuffer *combined_mask_buffer;
GeglRectangle combined_mask_rect;
GeglRectangle aligned_combined_mask_rect;
combined_mask_rect = *GEGL_RECTANGLE (core->paint_buffer_x,
core->paint_buffer_y,
width, height);
gegl_rectangle_align_to_buffer (
&aligned_combined_mask_rect, &combined_mask_rect,
pika_drawable_get_buffer (drawable),
GEGL_RECTANGLE_ALIGNMENT_SUPERSET);
combined_mask_buffer = gegl_buffer_new (&aligned_combined_mask_rect,
babl_format ("Y float"));
pika_gegl_buffer_copy (
core->mask_buffer,
GEGL_RECTANGLE (aligned_combined_mask_rect.x + offset_x,
aligned_combined_mask_rect.y + offset_y,
aligned_combined_mask_rect.width,
aligned_combined_mask_rect.height),
GEGL_ABYSS_NONE,
combined_mask_buffer,
&aligned_combined_mask_rect);
pika_gegl_combine_mask (mask_buffer, &mask_rect,
combined_mask_buffer, &combined_mask_rect,
1.0);
g_object_unref (mask_buffer);
mask_buffer = combined_mask_buffer;
mask_rect = combined_mask_rect;
}
pika_applicator_set_mask_buffer (applicator, mask_buffer);
pika_applicator_set_mask_offset (applicator,
core->paint_buffer_x - mask_rect.x,
core->paint_buffer_y - mask_rect.y);
pika_applicator_set_apply_buffer (applicator,
core->paint_buffer);
pika_applicator_set_apply_offset (applicator,
core->paint_buffer_x,
core->paint_buffer_y);
pika_applicator_set_opacity (applicator, image_opacity);
pika_applicator_set_mode (applicator, PIKA_LAYER_MODE_REPLACE,
PIKA_LAYER_COLOR_SPACE_AUTO,
PIKA_LAYER_COLOR_SPACE_AUTO,
pika_layer_mode_get_paint_composite_mode (
PIKA_LAYER_MODE_REPLACE));
/* apply the paint area to the image */
pika_applicator_blit (applicator,
GEGL_RECTANGLE (core->paint_buffer_x,
core->paint_buffer_y,
width, height));
pika_applicator_set_mask_buffer (applicator, core->mask_buffer);
pika_applicator_set_mask_offset (applicator, -offset_x, -offset_y);
g_object_unref (mask_buffer);
}
else
{
pika_paint_core_paste (core, paint_mask,
paint_mask_offset_x,
paint_mask_offset_y,
drawable,
paint_opacity,
image_opacity,
PIKA_LAYER_MODE_REPLACE,
mode);
return;
}
/* Update the undo extents */
core->x1 = MIN (core->x1, core->paint_buffer_x);
core->y1 = MIN (core->y1, core->paint_buffer_y);
core->x2 = MAX (core->x2, core->paint_buffer_x + width);
core->y2 = MAX (core->y2, core->paint_buffer_y + height);
/* Update the drawable */
pika_drawable_update (drawable,
core->paint_buffer_x,
core->paint_buffer_y,
width, height);
}
/**
* Smooth and store coords in the stroke buffer
*/
void
pika_paint_core_smooth_coords (PikaPaintCore *core,
PikaPaintOptions *paint_options,
PikaCoords *coords)
{
PikaSmoothingOptions *smoothing_options = paint_options->smoothing_options;
GArray *history = core->stroke_buffer;
if (core->stroke_buffer == NULL)
return; /* Paint core has not initialized yet */
if (smoothing_options->use_smoothing &&
smoothing_options->smoothing_quality > 0)
{
gint i;
guint length;
gint min_index;
gdouble gaussian_weight = 0.0;
gdouble gaussian_weight2 = SQR (smoothing_options->smoothing_factor);
gdouble velocity_sum = 0.0;
gdouble scale_sum = 0.0;
g_array_append_val (history, *coords);
if (history->len < 2)
return; /* Just don't bother, nothing to do */
coords->x = coords->y = 0.0;
length = MIN (smoothing_options->smoothing_quality, history->len);
min_index = history->len - length;
if (gaussian_weight2 != 0.0)
gaussian_weight = 1 / (sqrt (2 * G_PI) * smoothing_options->smoothing_factor);
for (i = history->len - 1; i >= min_index; i--)
{
gdouble rate = 0.0;
PikaCoords *next_coords = &g_array_index (history,
PikaCoords, i);
if (gaussian_weight2 != 0.0)
{
/* We use gaussian function with velocity as a window function */
velocity_sum += next_coords->velocity * 100;
rate = gaussian_weight * exp (-velocity_sum * velocity_sum /
(2 * gaussian_weight2));
}
scale_sum += rate;
coords->x += rate * next_coords->x;
coords->y += rate * next_coords->y;
}
if (scale_sum != 0.0)
{
coords->x /= scale_sum;
coords->y /= scale_sum;
}
}
}