PIKApp/app/paint/pikamybrushcore.c

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/* 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
*
* 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 <cairo.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include <mypaint-brush.h>
#include "libpikamath/pikamath.h"
#include "libpikacolor/pikacolor.h"
#include "paint-types.h"
#include "gegl/pika-gegl-utils.h"
#include "core/pika.h"
#include "core/pika-palettes.h"
#include "core/pikadrawable.h"
#include "core/pikaerror.h"
#include "core/pikamybrush.h"
#include "core/pikapickable.h"
#include "core/pikasymmetry.h"
#include "pikamybrushcore.h"
#include "pikamybrushsurface.h"
#include "pikamybrushoptions.h"
#include "pika-intl.h"
struct _PikaMybrushCorePrivate
{
PikaMybrush *mybrush;
PikaMybrushSurface *surface;
GList *brushes;
gboolean synthetic;
gint64 last_time;
};
/* local function prototypes */
static void pika_mybrush_core_finalize (GObject *object);
static gboolean pika_mybrush_core_start (PikaPaintCore *paint_core,
GList *drawables,
PikaPaintOptions *paint_options,
const PikaCoords *coords,
GError **error);
static void pika_mybrush_core_interpolate (PikaPaintCore *paint_core,
GList *drawables,
PikaPaintOptions *paint_options,
guint32 time);
static void pika_mybrush_core_paint (PikaPaintCore *paint_core,
GList *drawables,
PikaPaintOptions *paint_options,
PikaSymmetry *sym,
PikaPaintState paint_state,
guint32 time);
static void pika_mybrush_core_motion (PikaPaintCore *paint_core,
PikaDrawable *drawable,
PikaPaintOptions *paint_options,
PikaSymmetry *sym,
guint32 time);
static void pika_mybrush_core_create_brushes (PikaMybrushCore *mybrush,
PikaDrawable *drawable,
PikaPaintOptions *paint_options,
PikaSymmetry *sym);
G_DEFINE_TYPE_WITH_PRIVATE (PikaMybrushCore, pika_mybrush_core,
PIKA_TYPE_PAINT_CORE)
#define parent_class pika_mybrush_core_parent_class
void
pika_mybrush_core_register (Pika *pika,
PikaPaintRegisterCallback callback)
{
(* callback) (pika,
PIKA_TYPE_MYBRUSH_CORE,
PIKA_TYPE_MYBRUSH_OPTIONS,
"pika-mybrush",
_("Mybrush"),
"pika-tool-mypaint-brush");
}
static void
pika_mybrush_core_class_init (PikaMybrushCoreClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaPaintCoreClass *paint_core_class = PIKA_PAINT_CORE_CLASS (klass);
object_class->finalize = pika_mybrush_core_finalize;
paint_core_class->start = pika_mybrush_core_start;
paint_core_class->paint = pika_mybrush_core_paint;
paint_core_class->interpolate = pika_mybrush_core_interpolate;
}
static void
pika_mybrush_core_init (PikaMybrushCore *mybrush)
{
mybrush->private = pika_mybrush_core_get_instance_private (mybrush);
}
static void
pika_mybrush_core_finalize (GObject *object)
{
PikaMybrushCore *core = PIKA_MYBRUSH_CORE (object);
if (core->private->brushes)
{
g_list_free_full (core->private->brushes,
(GDestroyNotify) mypaint_brush_unref);
core->private->brushes = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
pika_mybrush_core_start (PikaPaintCore *paint_core,
GList *drawables,
PikaPaintOptions *paint_options,
const PikaCoords *coords,
GError **error)
{
PikaMybrushCore *core = PIKA_MYBRUSH_CORE (paint_core);
PikaContext *context = PIKA_CONTEXT (paint_options);
core->private->mybrush = pika_context_get_mybrush (context);
if (! core->private->mybrush)
{
g_set_error_literal (error, PIKA_ERROR, PIKA_FAILED,
_("No MyPaint brushes available for use with this tool."));
return FALSE;
}
return TRUE;
}
static void
pika_mybrush_core_interpolate (PikaPaintCore *paint_core,
GList *drawables,
PikaPaintOptions *paint_options,
guint32 time)
{
PikaMybrushCore *mybrush = PIKA_MYBRUSH_CORE (paint_core);
/* If this is the first motion the brush has received then
* we're being asked to draw a synthetic stroke in line mode
*/
if (mybrush->private->last_time < 0)
{
PikaCoords saved_coords = paint_core->cur_coords;
paint_core->cur_coords = paint_core->last_coords;
mybrush->private->synthetic = TRUE;
pika_paint_core_paint (paint_core, drawables, paint_options,
PIKA_PAINT_STATE_MOTION, time);
paint_core->cur_coords = saved_coords;
}
pika_paint_core_paint (paint_core, drawables, paint_options,
PIKA_PAINT_STATE_MOTION, time);
paint_core->last_coords = paint_core->cur_coords;
}
static void
pika_mybrush_core_paint (PikaPaintCore *paint_core,
GList *drawables,
PikaPaintOptions *paint_options,
PikaSymmetry *sym,
PikaPaintState paint_state,
guint32 time)
{
PikaMybrushCore *mybrush = PIKA_MYBRUSH_CORE (paint_core);
PikaContext *context = PIKA_CONTEXT (paint_options);
gint offset_x;
gint offset_y;
PikaRGB fg;
g_return_if_fail (g_list_length (drawables) == 1);
switch (paint_state)
{
case PIKA_PAINT_STATE_INIT:
pika_context_get_foreground (context, &fg);
pika_palettes_add_color_history (context->pika, &fg);
pika_symmetry_set_stateful (sym, TRUE);
pika_item_get_offset (drawables->data, &offset_x, &offset_y);
mybrush->private->surface =
pika_mypaint_surface_new (pika_drawable_get_buffer (drawables->data),
pika_drawable_get_active_mask (drawables->data),
paint_core->mask_buffer,
-offset_x, -offset_y,
PIKA_MYBRUSH_OPTIONS (paint_options));
pika_mybrush_core_create_brushes (mybrush, drawables->data, paint_options, sym);
mybrush->private->last_time = -1;
mybrush->private->synthetic = FALSE;
break;
case PIKA_PAINT_STATE_MOTION:
pika_mybrush_core_motion (paint_core, drawables->data, paint_options,
sym, time);
break;
case PIKA_PAINT_STATE_FINISH:
pika_symmetry_set_stateful (sym, FALSE);
mypaint_surface_unref ((MyPaintSurface *) mybrush->private->surface);
mybrush->private->surface = NULL;
g_list_free_full (mybrush->private->brushes,
(GDestroyNotify) mypaint_brush_unref);
mybrush->private->brushes = NULL;
break;
}
}
static void
pika_mybrush_core_motion (PikaPaintCore *paint_core,
PikaDrawable *drawable,
PikaPaintOptions *paint_options,
PikaSymmetry *sym,
guint32 time)
{
PikaMybrushCore *mybrush = PIKA_MYBRUSH_CORE (paint_core);
MyPaintRectangle rect;
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PikaCoords origin;
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GList *iter;
gdouble dt = 0.0;
gint off_x, off_y;
gint n_strokes;
gint i;
pika_item_get_offset (PIKA_ITEM (drawable), &off_x, &off_y);
n_strokes = pika_symmetry_get_size (sym);
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origin = *(pika_symmetry_get_origin (sym));
origin.x -= off_x;
origin.y -= off_y;
pika_symmetry_set_origin (sym, drawable, &origin);
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/* The number of strokes may change during a motion, depending on
* the type of symmetry. When that happens, reset the brushes.
*/
if (g_list_length (mybrush->private->brushes) != n_strokes)
{
pika_mybrush_core_create_brushes (mybrush, drawable, paint_options, sym);
}
mypaint_surface_begin_atomic ((MyPaintSurface *) mybrush->private->surface);
if (mybrush->private->last_time < 0)
{
/* First motion, so we need zero pressure events to start the strokes */
for (iter = mybrush->private->brushes, i = 0;
iter;
iter = g_list_next (iter), i++)
{
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MyPaintBrush *brush = iter->data;
PikaCoords coords = *(pika_symmetry_get_coords (sym, i));
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mypaint_brush_stroke_to (brush,
(MyPaintSurface *) mybrush->private->surface,
coords.x,
coords.y,
0.0f,
coords.xtilt,
coords.ytilt,
1.0f /* Pretend the cursor hasn't moved in a while */);
}
dt = 0.015;
}
else if (mybrush->private->synthetic)
{
PikaVector2 v = { paint_core->cur_coords.x - paint_core->last_coords.x,
paint_core->cur_coords.y - paint_core->last_coords.y };
dt = 0.0005 * pika_vector2_length_val (v);
}
else
{
dt = (time - mybrush->private->last_time) * 0.001;
}
for (iter = mybrush->private->brushes, i = 0;
iter;
iter = g_list_next (iter), i++)
{
MyPaintBrush *brush = iter->data;
PikaCoords coords = *(pika_symmetry_get_coords (sym, i));
gdouble pressure = coords.pressure;
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gboolean expanded;
gfloat radius = 100;
gint x1, x2, y1, y2;
gint offset_change_x, offset_change_y;
gint off_x_surf, off_y_surf;
gint off_x, off_y;
x1 = coords.x - radius;
y1 = coords.y - radius;
x2 = coords.x + radius;
y2 = coords.y + radius;
expanded = pika_paint_core_expand_drawable (paint_core, drawable, paint_options,
x1, x2, y1, y2,
&offset_change_x, &offset_change_y);
pika_item_get_offset (PIKA_ITEM (drawable), &off_x, &off_y);
if (expanded)
pika_mypaint_surface_set_buffer (mybrush->private->surface, pika_drawable_get_buffer (drawable),
off_x, off_y);
pika_mypaint_surface_get_offset (mybrush->private->surface, &off_x_surf, &off_y_surf);
coords.x -= off_x_surf;
coords.y -= off_y_surf;
if (offset_change_x || offset_change_y)
{
pika_mypaint_surface_set_offset (mybrush->private->surface,
off_x_surf + offset_change_x,
off_y_surf + offset_change_y);
origin = *(pika_symmetry_get_origin (sym));
origin.x += offset_change_x;
origin.y += offset_change_y;
pika_symmetry_set_origin (sym, drawable, &origin);
}
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mypaint_brush_stroke_to (brush,
(MyPaintSurface *) mybrush->private->surface,
coords.x,
coords.y,
pressure,
coords.xtilt,
coords.ytilt,
dt);
}
mybrush->private->last_time = time;
mypaint_surface_end_atomic ((MyPaintSurface *) mybrush->private->surface,
&rect);
if (rect.width > 0 && rect.height > 0)
{
paint_core->x1 = MIN (paint_core->x1, rect.x);
paint_core->y1 = MIN (paint_core->y1, rect.y);
paint_core->x2 = MAX (paint_core->x2, rect.x + rect.width);
paint_core->y2 = MAX (paint_core->y2, rect.y + rect.height);
pika_drawable_update (drawable, rect.x, rect.y, rect.width, rect.height);
}
}
static void
pika_mybrush_core_create_brushes (PikaMybrushCore *mybrush,
PikaDrawable *drawable,
PikaPaintOptions *paint_options,
PikaSymmetry *sym)
{
PikaMybrushOptions *options = PIKA_MYBRUSH_OPTIONS (paint_options);
PikaContext *context = PIKA_CONTEXT (paint_options);
PikaRGB fg;
PikaHSV hsv;
gint n_strokes;
gint i;
if (mybrush->private->brushes)
{
g_list_free_full (mybrush->private->brushes,
(GDestroyNotify) mypaint_brush_unref);
mybrush->private->brushes = NULL;
}
if (options->eraser)
pika_context_get_background (context, &fg);
else
pika_context_get_foreground (context, &fg);
pika_pickable_srgb_to_image_color (PIKA_PICKABLE (drawable),
&fg, &fg);
pika_rgb_to_hsv (&fg, &hsv);
n_strokes = pika_symmetry_get_size (sym);
for (i = 0; i < n_strokes; i++)
{
MyPaintBrush *brush = mypaint_brush_new ();
const gchar *brush_data;
mypaint_brush_from_defaults (brush);
brush_data = pika_mybrush_get_brush_json (mybrush->private->mybrush);
if (brush_data)
mypaint_brush_from_string (brush, brush_data);
if (! mypaint_brush_get_base_value (brush,
MYPAINT_BRUSH_SETTING_RESTORE_COLOR))
{
mypaint_brush_set_base_value (brush,
MYPAINT_BRUSH_SETTING_COLOR_H,
hsv.h);
mypaint_brush_set_base_value (brush,
MYPAINT_BRUSH_SETTING_COLOR_S,
hsv.s);
mypaint_brush_set_base_value (brush,
MYPAINT_BRUSH_SETTING_COLOR_V,
hsv.v);
}
mypaint_brush_set_base_value (brush,
MYPAINT_BRUSH_SETTING_RADIUS_LOGARITHMIC,
options->radius);
mypaint_brush_set_base_value (brush,
MYPAINT_BRUSH_SETTING_OPAQUE,
options->opaque *
pika_context_get_opacity (context));
mypaint_brush_set_base_value (brush,
MYPAINT_BRUSH_SETTING_HARDNESS,
options->hardness);
mypaint_brush_set_base_value (brush,
MYPAINT_BRUSH_SETTING_ERASER,
(options->eraser &&
pika_drawable_has_alpha (drawable)) ?
1.0f : 0.0f);
mypaint_brush_new_stroke (brush);
mybrush->private->brushes = g_list_prepend (mybrush->private->brushes,
brush);
}
mybrush->private->brushes = g_list_reverse (mybrush->private->brushes);
}