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gimp/app/paint/gimpmybrushcore.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 <string.h>
#include <cairo.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include <mypaint-brush.h>
#include "libgimpmath/gimpmath.h"
#include "libgimpcolor/gimpcolor.h"
#include "paint-types.h"
#include "gegl/gimp-gegl-utils.h"
#include "core/gimp.h"
#include "core/gimp-palettes.h"
#include "core/gimpdrawable.h"
#include "core/gimperror.h"
#include "core/gimpmybrush.h"
#include "core/gimppickable.h"
#include "core/gimpsymmetry.h"
#include "gimpmybrushcore.h"
#include "gimpmybrushsurface.h"
#include "gimpmybrushoptions.h"
#include "gimp-intl.h"
struct _GimpMybrushCorePrivate
{
GimpMybrush *mybrush;
GimpMybrushSurface *surface;
GList *brushes;
gboolean synthetic;
gint64 last_time;
};
/* local function prototypes */
static void gimp_mybrush_core_finalize (GObject *object);
static gboolean gimp_mybrush_core_start (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
const GimpCoords *coords,
GError **error);
static void gimp_mybrush_core_interpolate (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
guint32 time);
static void gimp_mybrush_core_paint (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpSymmetry *sym,
GimpPaintState paint_state,
guint32 time);
static void gimp_mybrush_core_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpSymmetry *sym,
guint32 time);
static void gimp_mybrush_core_create_brushes (GimpMybrushCore *mybrush,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpSymmetry *sym);
G_DEFINE_TYPE_WITH_PRIVATE (GimpMybrushCore, gimp_mybrush_core,
GIMP_TYPE_PAINT_CORE)
#define parent_class gimp_mybrush_core_parent_class
void
gimp_mybrush_core_register (Gimp *gimp,
GimpPaintRegisterCallback callback)
{
(* callback) (gimp,
GIMP_TYPE_MYBRUSH_CORE,
GIMP_TYPE_MYBRUSH_OPTIONS,
"gimp-mybrush",
_("Mybrush"),
"gimp-tool-mypaint-brush");
}
static void
gimp_mybrush_core_class_init (GimpMybrushCoreClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpPaintCoreClass *paint_core_class = GIMP_PAINT_CORE_CLASS (klass);
object_class->finalize = gimp_mybrush_core_finalize;
paint_core_class->start = gimp_mybrush_core_start;
paint_core_class->paint = gimp_mybrush_core_paint;
paint_core_class->interpolate = gimp_mybrush_core_interpolate;
}
static void
gimp_mybrush_core_init (GimpMybrushCore *mybrush)
{
mybrush->private = gimp_mybrush_core_get_instance_private (mybrush);
}
static void
gimp_mybrush_core_finalize (GObject *object)
{
GimpMybrushCore *core = GIMP_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
gimp_mybrush_core_start (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
const GimpCoords *coords,
GError **error)
{
GimpMybrushCore *core = GIMP_MYBRUSH_CORE (paint_core);
GimpContext *context = GIMP_CONTEXT (paint_options);
core->private->mybrush = gimp_context_get_mybrush (context);
if (! core->private->mybrush)
{
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
_("No MyPaint brushes available for use with this tool."));
return FALSE;
}
return TRUE;
}
static void
gimp_mybrush_core_interpolate (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
guint32 time)
{
GimpMybrushCore *mybrush = GIMP_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)
{
GimpCoords saved_coords = paint_core->cur_coords;
paint_core->cur_coords = paint_core->last_coords;
mybrush->private->synthetic = TRUE;
gimp_paint_core_paint (paint_core, drawable, paint_options,
GIMP_PAINT_STATE_MOTION, time);
paint_core->cur_coords = saved_coords;
}
gimp_paint_core_paint (paint_core, drawable, paint_options,
GIMP_PAINT_STATE_MOTION, time);
paint_core->last_coords = paint_core->cur_coords;
}
static void
gimp_mybrush_core_paint (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpSymmetry *sym,
GimpPaintState paint_state,
guint32 time)
{
GimpMybrushCore *mybrush = GIMP_MYBRUSH_CORE (paint_core);
GimpContext *context = GIMP_CONTEXT (paint_options);
GimpRGB fg;
switch (paint_state)
{
case GIMP_PAINT_STATE_INIT:
gimp_context_get_foreground (context, &fg);
gimp_palettes_add_color_history (context->gimp, &fg);
gimp_symmetry_set_stateful (sym, TRUE);
mybrush->private->surface =
gimp_mypaint_surface_new (gimp_drawable_get_buffer (drawable),
gimp_drawable_get_active_mask (drawable),
paint_core->mask_buffer,
paint_core->mask_x_offset,
paint_core->mask_y_offset,
GIMP_MYBRUSH_OPTIONS (paint_options));
gimp_mybrush_core_create_brushes (mybrush, drawable, paint_options, sym);
mybrush->private->last_time = -1;
mybrush->private->synthetic = FALSE;
break;
case GIMP_PAINT_STATE_MOTION:
gimp_mybrush_core_motion (paint_core, drawable, paint_options,
sym, time);
break;
case GIMP_PAINT_STATE_FINISH:
gimp_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
gimp_mybrush_core_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpSymmetry *sym,
guint32 time)
{
GimpMybrushCore *mybrush = GIMP_MYBRUSH_CORE (paint_core);
MyPaintRectangle rect;
GList *iter;
gdouble dt = 0.0;
gint n_strokes;
gint i;
n_strokes = gimp_symmetry_get_size (sym);
/* 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)
{
gimp_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++)
{
MyPaintBrush *brush = iter->data;
GimpCoords *coords = gimp_symmetry_get_coords (sym, i);
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)
{
GimpVector2 v = { paint_core->cur_coords.x - paint_core->last_coords.x,
paint_core->cur_coords.y - paint_core->last_coords.y };
dt = 0.0005 * gimp_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;
GimpCoords *coords = gimp_symmetry_get_coords (sym, i);
gdouble pressure = coords->pressure;
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);
gimp_drawable_update (drawable, rect.x, rect.y, rect.width, rect.height);
}
}
static void
gimp_mybrush_core_create_brushes (GimpMybrushCore *mybrush,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
GimpSymmetry *sym)
{
GimpMybrushOptions *options = GIMP_MYBRUSH_OPTIONS (paint_options);
GimpContext *context = GIMP_CONTEXT (paint_options);
GimpRGB fg;
GimpHSV 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)
gimp_context_get_background (context, &fg);
else
gimp_context_get_foreground (context, &fg);
gimp_pickable_srgb_to_image_color (GIMP_PICKABLE (drawable),
&fg, &fg);
gimp_rgb_to_hsv (&fg, &hsv);
n_strokes = gimp_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 = gimp_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 *
gimp_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 &&
gimp_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);
}
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