/* 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 <http://www.gnu.org/licenses/>.
 */

#ifndef __GIMP_BRUSH_CORE_H__
#define __GIMP_BRUSH_CORE_H__


#include "gimppaintcore.h"


#define BRUSH_CORE_SUBSAMPLE        4
#define BRUSH_CORE_SOLID_SUBSAMPLE  2
#define BRUSH_CORE_JITTER_LUTSIZE   360


#define GIMP_TYPE_BRUSH_CORE            (gimp_brush_core_get_type ())
#define GIMP_BRUSH_CORE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_BRUSH_CORE, GimpBrushCore))
#define GIMP_BRUSH_CORE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_BRUSH_CORE, GimpBrushCoreClass))
#define GIMP_IS_BRUSH_CORE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_BRUSH_CORE))
#define GIMP_IS_BRUSH_CORE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_BRUSH_CORE))
#define GIMP_BRUSH_CORE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_BRUSH_CORE, GimpBrushCoreClass))


typedef struct _GimpBrushCoreClass GimpBrushCoreClass;

struct _GimpBrushCore
{
  GimpPaintCore  parent_instance;

  GimpBrush     *main_brush;
  GimpBrush     *brush;
  GimpDynamics  *dynamics;
  gdouble        spacing;
  gdouble        scale;
  gdouble        angle;
  gdouble        hardness;
  gdouble        force;
  gdouble        aspect_ratio;

  /*  brush buffers  */
  TempBuf       *pressure_brush;

  TempBuf       *solid_brushes[BRUSH_CORE_SOLID_SUBSAMPLE][BRUSH_CORE_SOLID_SUBSAMPLE];
  TempBuf       *last_solid_brush;
  gboolean       solid_cache_invalid;

  TempBuf       *transform_brush;
  TempBuf       *last_transform_brush;
  gint           last_transform_width;
  gint           last_transform_height;
  gdouble        last_scale;
  gdouble        last_angle;
  gdouble        last_hardness;
  gdouble        last_aspect_ratio;

  TempBuf       *transform_pixmap;
  TempBuf       *last_transform_pixmap;
  gint           last_transform_pixmap_width;
  gint           last_transform_pixmap_height;

  TempBuf       *kernel_brushes[BRUSH_CORE_SUBSAMPLE + 1][BRUSH_CORE_SUBSAMPLE + 1];

  TempBuf       *last_brush_mask;
  gboolean       cache_invalid;

  gdouble        jitter;
  gdouble        jitter_lut_x[BRUSH_CORE_JITTER_LUTSIZE];
  gdouble        jitter_lut_y[BRUSH_CORE_JITTER_LUTSIZE];

  GRand         *rand;

  /*  don't use these...  */
  BoundSeg      *brush_bound_segs;
  gint           n_brush_bound_segs;
  gint           brush_bound_width;
  gint           brush_bound_height;
  gint           transformed_brush_bound_width;
  gint           transformed_brush_bound_height;
};

struct _GimpBrushCoreClass
{
  GimpPaintCoreClass  parent_class;

  /*  Set for tools that don't mind if the brush changes while painting  */
  gboolean            handles_changing_brush;

  /*  Set for tools that don't mind if the brush scales while painting  */
  gboolean            handles_transforming_brush;
  /*  Set for tools that don't mind if the brush scales mid stroke  */
  gboolean            handles_dynamic_transforming_brush;

  void (* set_brush)    (GimpBrushCore *core,
                         GimpBrush     *brush);
  void (* set_dynamics) (GimpBrushCore *core,
                         GimpDynamics  *brush);
};


GType   gimp_brush_core_get_type       (void) G_GNUC_CONST;

void    gimp_brush_core_set_brush      (GimpBrushCore            *core,
                                        GimpBrush                *brush);

void    gimp_brush_core_set_dynamics   (GimpBrushCore            *core,
                                        GimpDynamics             *dynamics);

void    gimp_brush_core_create_boundary(GimpBrushCore            *core,
                                        GimpPaintOptions         *options);
gboolean gimp_brush_core_get_transform (GimpBrushCore            *core,
                                        GimpMatrix3              *matrix);

void    gimp_brush_core_paste_canvas   (GimpBrushCore            *core,
                                        GimpDrawable             *drawable,
                                        const GimpCoords         *coords,
                                        gdouble                   brush_opacity,
                                        gdouble                   image_opacity,
                                        GimpLayerModeEffects      paint_mode,
                                        GimpBrushApplicationMode  brush_hardness,
                                        gdouble                   dynamic_hardness,
                                        GimpPaintApplicationMode  mode);
void    gimp_brush_core_replace_canvas (GimpBrushCore            *core,
                                        GimpDrawable             *drawable,
                                        const GimpCoords         *coords,
                                        gdouble                   brush_opacity,
                                        gdouble                   image_opacity,
                                        GimpBrushApplicationMode  brush_hardness,
                                        gdouble                   dynamic_hardness,
                                        GimpPaintApplicationMode  mode);

void    gimp_brush_core_color_area_with_pixmap
                                         (GimpBrushCore            *core,
                                          GimpDrawable             *drawable,
                                          const GimpCoords         *coords,
                                          TempBuf                  *area,
                                          GimpBrushApplicationMode  mode);

TempBuf * gimp_brush_core_get_brush_mask (GimpBrushCore            *core,
                                          const GimpCoords         *coords,
                                          GimpBrushApplicationMode  brush_hardness,
                                          gdouble                   dynamic_hardness);


void gimp_brush_core_eval_transform_dynamics (GimpPaintCore     *paint_core,
                                              GimpDrawable      *drawable,
                                              GimpPaintOptions  *paint_options,
                                              const GimpCoords  *coords);

#endif  /*  __GIMP_BRUSH_CORE_H__  */