470 lines
17 KiB
C
470 lines
17 KiB
C
/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <string.h>
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#include <cairo.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include <gegl.h>
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#include <mypaint-brush.h>
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#include "libpikamath/pikamath.h"
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#include "libpikacolor/pikacolor.h"
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#include "paint-types.h"
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#include "gegl/pika-gegl-utils.h"
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#include "core/pika.h"
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#include "core/pika-palettes.h"
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#include "core/pikadrawable.h"
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#include "core/pikaerror.h"
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#include "core/pikamybrush.h"
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#include "core/pikapickable.h"
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#include "core/pikasymmetry.h"
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#include "pikamybrushcore.h"
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#include "pikamybrushsurface.h"
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#include "pikamybrushoptions.h"
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#include "pika-intl.h"
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struct _PikaMybrushCorePrivate
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{
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PikaMybrush *mybrush;
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PikaMybrushSurface *surface;
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GList *brushes;
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gboolean synthetic;
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gint64 last_time;
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};
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/* local function prototypes */
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static void pika_mybrush_core_finalize (GObject *object);
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static gboolean pika_mybrush_core_start (PikaPaintCore *paint_core,
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GList *drawables,
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PikaPaintOptions *paint_options,
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const PikaCoords *coords,
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GError **error);
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static void pika_mybrush_core_interpolate (PikaPaintCore *paint_core,
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GList *drawables,
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PikaPaintOptions *paint_options,
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guint32 time);
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static void pika_mybrush_core_paint (PikaPaintCore *paint_core,
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GList *drawables,
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PikaPaintOptions *paint_options,
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PikaSymmetry *sym,
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PikaPaintState paint_state,
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guint32 time);
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static void pika_mybrush_core_motion (PikaPaintCore *paint_core,
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PikaDrawable *drawable,
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PikaPaintOptions *paint_options,
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PikaSymmetry *sym,
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guint32 time);
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static void pika_mybrush_core_create_brushes (PikaMybrushCore *mybrush,
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PikaDrawable *drawable,
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PikaPaintOptions *paint_options,
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PikaSymmetry *sym);
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G_DEFINE_TYPE_WITH_PRIVATE (PikaMybrushCore, pika_mybrush_core,
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PIKA_TYPE_PAINT_CORE)
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#define parent_class pika_mybrush_core_parent_class
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void
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pika_mybrush_core_register (Pika *pika,
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PikaPaintRegisterCallback callback)
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{
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(* callback) (pika,
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PIKA_TYPE_MYBRUSH_CORE,
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PIKA_TYPE_MYBRUSH_OPTIONS,
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"pika-mybrush",
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_("Mybrush"),
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"pika-tool-mypaint-brush");
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}
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static void
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pika_mybrush_core_class_init (PikaMybrushCoreClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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PikaPaintCoreClass *paint_core_class = PIKA_PAINT_CORE_CLASS (klass);
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object_class->finalize = pika_mybrush_core_finalize;
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paint_core_class->start = pika_mybrush_core_start;
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paint_core_class->paint = pika_mybrush_core_paint;
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paint_core_class->interpolate = pika_mybrush_core_interpolate;
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}
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static void
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pika_mybrush_core_init (PikaMybrushCore *mybrush)
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{
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mybrush->private = pika_mybrush_core_get_instance_private (mybrush);
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}
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static void
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pika_mybrush_core_finalize (GObject *object)
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{
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PikaMybrushCore *core = PIKA_MYBRUSH_CORE (object);
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if (core->private->brushes)
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{
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g_list_free_full (core->private->brushes,
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(GDestroyNotify) mypaint_brush_unref);
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core->private->brushes = NULL;
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}
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static gboolean
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pika_mybrush_core_start (PikaPaintCore *paint_core,
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GList *drawables,
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PikaPaintOptions *paint_options,
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const PikaCoords *coords,
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GError **error)
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{
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PikaMybrushCore *core = PIKA_MYBRUSH_CORE (paint_core);
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PikaContext *context = PIKA_CONTEXT (paint_options);
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core->private->mybrush = pika_context_get_mybrush (context);
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if (! core->private->mybrush)
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{
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g_set_error_literal (error, PIKA_ERROR, PIKA_FAILED,
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_("No MyPaint brushes available for use with this tool."));
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return FALSE;
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}
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return TRUE;
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}
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static void
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pika_mybrush_core_interpolate (PikaPaintCore *paint_core,
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GList *drawables,
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PikaPaintOptions *paint_options,
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guint32 time)
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{
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PikaMybrushCore *mybrush = PIKA_MYBRUSH_CORE (paint_core);
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/* If this is the first motion the brush has received then
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* we're being asked to draw a synthetic stroke in line mode
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*/
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if (mybrush->private->last_time < 0)
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{
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PikaCoords saved_coords = paint_core->cur_coords;
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paint_core->cur_coords = paint_core->last_coords;
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mybrush->private->synthetic = TRUE;
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pika_paint_core_paint (paint_core, drawables, paint_options,
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PIKA_PAINT_STATE_MOTION, time);
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paint_core->cur_coords = saved_coords;
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}
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pika_paint_core_paint (paint_core, drawables, paint_options,
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PIKA_PAINT_STATE_MOTION, time);
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paint_core->last_coords = paint_core->cur_coords;
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}
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static void
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pika_mybrush_core_paint (PikaPaintCore *paint_core,
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GList *drawables,
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PikaPaintOptions *paint_options,
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PikaSymmetry *sym,
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PikaPaintState paint_state,
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guint32 time)
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{
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PikaMybrushCore *mybrush = PIKA_MYBRUSH_CORE (paint_core);
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PikaContext *context = PIKA_CONTEXT (paint_options);
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gint offset_x;
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gint offset_y;
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PikaRGB fg;
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g_return_if_fail (g_list_length (drawables) == 1);
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switch (paint_state)
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{
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case PIKA_PAINT_STATE_INIT:
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pika_context_get_foreground (context, &fg);
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pika_palettes_add_color_history (context->pika, &fg);
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pika_symmetry_set_stateful (sym, TRUE);
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pika_item_get_offset (drawables->data, &offset_x, &offset_y);
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mybrush->private->surface =
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pika_mypaint_surface_new (pika_drawable_get_buffer (drawables->data),
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pika_drawable_get_active_mask (drawables->data),
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paint_core->mask_buffer,
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-offset_x, -offset_y,
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PIKA_MYBRUSH_OPTIONS (paint_options));
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pika_mybrush_core_create_brushes (mybrush, drawables->data, paint_options, sym);
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mybrush->private->last_time = -1;
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mybrush->private->synthetic = FALSE;
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break;
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case PIKA_PAINT_STATE_MOTION:
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pika_mybrush_core_motion (paint_core, drawables->data, paint_options,
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sym, time);
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break;
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case PIKA_PAINT_STATE_FINISH:
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pika_symmetry_set_stateful (sym, FALSE);
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mypaint_surface_unref ((MyPaintSurface *) mybrush->private->surface);
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mybrush->private->surface = NULL;
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g_list_free_full (mybrush->private->brushes,
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(GDestroyNotify) mypaint_brush_unref);
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mybrush->private->brushes = NULL;
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break;
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}
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}
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static void
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pika_mybrush_core_motion (PikaPaintCore *paint_core,
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PikaDrawable *drawable,
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PikaPaintOptions *paint_options,
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PikaSymmetry *sym,
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guint32 time)
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{
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PikaMybrushCore *mybrush = PIKA_MYBRUSH_CORE (paint_core);
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MyPaintRectangle rect;
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PikaCoords origin;
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GList *iter;
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gdouble dt = 0.0;
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gint off_x, off_y;
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gint n_strokes;
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gint i;
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pika_item_get_offset (PIKA_ITEM (drawable), &off_x, &off_y);
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n_strokes = pika_symmetry_get_size (sym);
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origin = *(pika_symmetry_get_origin (sym));
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origin.x -= off_x;
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origin.y -= off_y;
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pika_symmetry_set_origin (sym, drawable, &origin);
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/* The number of strokes may change during a motion, depending on
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* the type of symmetry. When that happens, reset the brushes.
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*/
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if (g_list_length (mybrush->private->brushes) != n_strokes)
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{
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pika_mybrush_core_create_brushes (mybrush, drawable, paint_options, sym);
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}
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mypaint_surface_begin_atomic ((MyPaintSurface *) mybrush->private->surface);
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if (mybrush->private->last_time < 0)
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{
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/* First motion, so we need zero pressure events to start the strokes */
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for (iter = mybrush->private->brushes, i = 0;
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iter;
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iter = g_list_next (iter), i++)
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{
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MyPaintBrush *brush = iter->data;
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PikaCoords coords = *(pika_symmetry_get_coords (sym, i));
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mypaint_brush_stroke_to (brush,
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(MyPaintSurface *) mybrush->private->surface,
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coords.x,
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coords.y,
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0.0f,
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coords.xtilt,
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coords.ytilt,
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1.0f /* Pretend the cursor hasn't moved in a while */);
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}
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dt = 0.015;
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}
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else if (mybrush->private->synthetic)
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{
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PikaVector2 v = { paint_core->cur_coords.x - paint_core->last_coords.x,
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paint_core->cur_coords.y - paint_core->last_coords.y };
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dt = 0.0005 * pika_vector2_length_val (v);
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}
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else
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{
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dt = (time - mybrush->private->last_time) * 0.001;
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}
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for (iter = mybrush->private->brushes, i = 0;
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iter;
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iter = g_list_next (iter), i++)
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{
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MyPaintBrush *brush = iter->data;
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PikaCoords coords = *(pika_symmetry_get_coords (sym, i));
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gdouble pressure = coords.pressure;
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gboolean expanded;
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gfloat radius = 100;
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gint x1, x2, y1, y2;
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gint offset_change_x, offset_change_y;
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gint off_x_surf, off_y_surf;
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gint off_x, off_y;
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x1 = coords.x - radius;
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y1 = coords.y - radius;
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x2 = coords.x + radius;
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y2 = coords.y + radius;
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expanded = pika_paint_core_expand_drawable (paint_core, drawable, paint_options,
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x1, x2, y1, y2,
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&offset_change_x, &offset_change_y);
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pika_item_get_offset (PIKA_ITEM (drawable), &off_x, &off_y);
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if (expanded)
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pika_mypaint_surface_set_buffer (mybrush->private->surface, pika_drawable_get_buffer (drawable),
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off_x, off_y);
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pika_mypaint_surface_get_offset (mybrush->private->surface, &off_x_surf, &off_y_surf);
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coords.x -= off_x_surf;
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coords.y -= off_y_surf;
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if (offset_change_x || offset_change_y)
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{
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pika_mypaint_surface_set_offset (mybrush->private->surface,
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off_x_surf + offset_change_x,
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off_y_surf + offset_change_y);
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origin = *(pika_symmetry_get_origin (sym));
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origin.x += offset_change_x;
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origin.y += offset_change_y;
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pika_symmetry_set_origin (sym, drawable, &origin);
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}
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mypaint_brush_stroke_to (brush,
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(MyPaintSurface *) mybrush->private->surface,
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coords.x,
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coords.y,
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pressure,
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coords.xtilt,
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coords.ytilt,
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dt);
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}
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mybrush->private->last_time = time;
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mypaint_surface_end_atomic ((MyPaintSurface *) mybrush->private->surface,
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&rect);
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if (rect.width > 0 && rect.height > 0)
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{
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paint_core->x1 = MIN (paint_core->x1, rect.x);
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paint_core->y1 = MIN (paint_core->y1, rect.y);
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paint_core->x2 = MAX (paint_core->x2, rect.x + rect.width);
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paint_core->y2 = MAX (paint_core->y2, rect.y + rect.height);
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pika_drawable_update (drawable, rect.x, rect.y, rect.width, rect.height);
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}
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}
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static void
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pika_mybrush_core_create_brushes (PikaMybrushCore *mybrush,
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PikaDrawable *drawable,
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PikaPaintOptions *paint_options,
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PikaSymmetry *sym)
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{
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PikaMybrushOptions *options = PIKA_MYBRUSH_OPTIONS (paint_options);
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PikaContext *context = PIKA_CONTEXT (paint_options);
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PikaRGB fg;
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PikaHSV hsv;
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gint n_strokes;
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gint i;
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if (mybrush->private->brushes)
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{
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g_list_free_full (mybrush->private->brushes,
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(GDestroyNotify) mypaint_brush_unref);
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mybrush->private->brushes = NULL;
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}
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if (options->eraser)
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pika_context_get_background (context, &fg);
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else
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pika_context_get_foreground (context, &fg);
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pika_pickable_srgb_to_image_color (PIKA_PICKABLE (drawable),
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&fg, &fg);
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pika_rgb_to_hsv (&fg, &hsv);
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n_strokes = pika_symmetry_get_size (sym);
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for (i = 0; i < n_strokes; i++)
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{
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MyPaintBrush *brush = mypaint_brush_new ();
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const gchar *brush_data;
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mypaint_brush_from_defaults (brush);
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brush_data = pika_mybrush_get_brush_json (mybrush->private->mybrush);
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if (brush_data)
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mypaint_brush_from_string (brush, brush_data);
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if (! mypaint_brush_get_base_value (brush,
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MYPAINT_BRUSH_SETTING_RESTORE_COLOR))
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{
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mypaint_brush_set_base_value (brush,
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MYPAINT_BRUSH_SETTING_COLOR_H,
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hsv.h);
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mypaint_brush_set_base_value (brush,
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MYPAINT_BRUSH_SETTING_COLOR_S,
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hsv.s);
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mypaint_brush_set_base_value (brush,
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MYPAINT_BRUSH_SETTING_COLOR_V,
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hsv.v);
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}
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mypaint_brush_set_base_value (brush,
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MYPAINT_BRUSH_SETTING_RADIUS_LOGARITHMIC,
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options->radius);
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mypaint_brush_set_base_value (brush,
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MYPAINT_BRUSH_SETTING_OPAQUE,
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options->opaque *
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pika_context_get_opacity (context));
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mypaint_brush_set_base_value (brush,
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MYPAINT_BRUSH_SETTING_HARDNESS,
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options->hardness);
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mypaint_brush_set_base_value (brush,
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MYPAINT_BRUSH_SETTING_ERASER,
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(options->eraser &&
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pika_drawable_has_alpha (drawable)) ?
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1.0f : 0.0f);
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mypaint_brush_new_stroke (brush);
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mybrush->private->brushes = g_list_prepend (mybrush->private->brushes,
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brush);
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}
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mybrush->private->brushes = g_list_reverse (mybrush->private->brushes);
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}
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