/* The GIMP -- an 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*
 * gaussian_blur_region no longer does combination; arguments changed
 *   -- scott@poverty.bloomington.in.us, 16Oct97
 */

#ifndef __PAINT_FUNCS_INDEXEDA_H__
#define __PAINT_FUNCS_INDEXEDA_H__

#include "paint_funcsP.h"

void update_tile_rowhints_indexed (Tile *tile,
				   gint  ymin,
			           gint  ymax);

/*  Called initially to setup accelerated rendering features  */
void  paint_funcs_setup     (void);
void  paint_funcs_free      (void);

void paint_funcs_invalidate_color_hash_table (GimpImage* gimage,
					      gint       index);

/*  Paint functions  */

void  color_pixels          (guchar *dest, const guchar *color,
			     int w, int bytes);

void  blend_pixels          (const guchar *src1,
			     const guchar *src2,
			     guchar *dest, 
			     int blend, int w, int bytes, int has_alpha);

void  shade_pixels          (const guchar *src, guchar *dest,
			     const guchar *color,
			     int blend, int w, int bytes, int has_alpha);

void  extract_alpha_pixels  (const guchar *src,
			     const guchar *mask,
			     guchar *dest,
			     int w, int bytes);

void  darken_pixels         (const guchar *src1,
			     const guchar *src2,
	 		     guchar *dest, int length,
			     int bytes1, int bytes2,
			     int has_alpha1, int has_alpha2);

void  lighten_pixels        (const guchar *src1,
			     const guchar *src2,
	 		     guchar *dest, int length,
			     int bytes1, int bytes2,
			     int has_alpha1, int has_alpha2);

void  hsv_only_pixels       (const guchar *src1,
			     const guchar *src2,
	 		     guchar *dest, int mode, int length,
			     int bytes1, int bytes2,
			     int has_alpha1, int has_alpha2);

void  color_only_pixels     (const guchar *src1,
			     const guchar *src2,
	 		     guchar *dest, int mode, int length,
			     int bytes1, int bytes2,
			     int has_alpha1, int has_alpha2);

void  multiply_pixels       (const guchar *src1,
			     const guchar *src2,
	 		     guchar *dest, int length,
			     int bytes1, int bytes2,
			     int has_alpha1, int has_alpha2);

void  divide_pixels         (const guchar *src1,
			     const guchar *src2,
	 		     guchar *dest, int length,
			     int bytes1, int bytes2,
			     int has_alpha1, int has_alpha2);

void  screen_pixels         (const guchar *src1,
			     const guchar *src2,
	 		     guchar *dest, int length,
			     int bytes1, int bytes2,
			     int has_alpha1, int has_alpha2);

void  overlay_pixels        (const guchar *src1,
			     const guchar *src2,
	 		     guchar *dest, int length,
			     int bytes1, int bytes2,
			     int has_alpha1, int has_alpha2);

void  add_pixels             (const guchar *src1,
			     const guchar *src2,
	 		     guchar *dest, int length,
			     int bytes1, int bytes2,
			     int has_alpha1, int has_alpha2);

void  subtract_pixels       (const guchar *src1,
			     const guchar *src2,
	 		     guchar *dest, int length,
			     int bytes1, int bytes2,
			     int has_alpha1, int has_alpha2);

void  difference_pixels     (const guchar *src1,
			     const guchar *src2,
	 		     guchar *dest, int length,
			     int bytes1, int bytes2,
			     int has_alpha1, int has_alpha2);

void  dissolve_pixels       (const guchar *src,
			     guchar *dest, int x, int y,
			     int opacity, int length, int sb, int db,
			     int has_alpha);

void  swap_pixels           (guchar *src, guchar *dest,
			     int length);

void  scale_pixels          (const guchar *src, guchar *dest,
			     int length, int scale);

void  add_alpha_pixels      (const guchar *src, guchar *dest,
			     int length, int bytes);

void  flatten_pixels        (const guchar *src, guchar *dest,
			     const guchar *bg, int length, int bytes);

//void  gray_to_rgb_pixels    (const guchar *src, guchar *dest,
//			     int length, int bytes);


/*  apply the mask data to the alpha channel of the pixel data  */
void  apply_mask_to_alpha_channel         (guchar *src,
					   const guchar *mask,
					   int opacity, int length, int bytes);

/*  combine the mask data with the alpha channel of the pixel data  */
void  combine_mask_and_alpha_channel      (guchar *src,
					   const guchar *mask,
					   int opacity, int length, int bytes);


/*  copy gray pixels to intensity-alpha pixels.  This function
 *  essentially takes a source that is only a grayscale image and
 *  copies it to the destination, expanding to RGB if necessary and
 *  adding an alpha channel.  (OPAQUE)
 */
void  copy_gray_to_inten_a_pixels         (const guchar *src,
					   guchar *dest,
					   int length, int bytes);

/*  lay down the initial pixels in the case of only one
 *  channel being visible and no layers...In this singular
 *  case, we want to display a grayscale image w/o transparency
 */
void  initial_channel_pixels              (const guchar *src,
					   guchar *dest,
					   int length, int bytes);

/*  lay down the initial pixels in the case of an indexed image.
 *  This process obviously requires no composition
 */
void initial_pixels_indexeda (const guchar *src,
			      guchar       *dest,
			      const guchar *mask,
			      const guchar *cmap,
			      guint         opacity,
			      guint         length);


/*  combine indexed images with an optional mask which
 *  is interpreted as binary...destination is indexed...
 */
void  combine_indexeda_and_indexed_pixels  (const guchar *src1,
					    const guchar *src2,
					    guchar *dest,
					    const guchar *mask,
					    guint opacity,
					    const gboolean *affect,
					    guint length);

/*  combine indexed images with indexed-alpha images
 *  result is an indexed image
 */
void  combine_indexeda_and_indexeda_pixels (const guchar *src1,
					    const guchar *src2,
					    guchar              *dest,
					    const guchar *mask,
					    guint                opacity,
					    const gboolean      *affect,
					    guint                length);

/*  combine indexed-alpha images with indexed-alpha images
 *  result is an indexed-alpha image.  use this for painting
 *  to an indexed floating sel
 */
void  combine_indexeda_and_indexeda_pixels (const guchar *src1,
					    const guchar *src2,
					    guchar       *dest,
					    const guchar *mask,
					    guint                opacity,
					    const gboolean      *affect,
					    guint                length);


/*  paint "behind" the existing pixel row (for indexed images).
 *  This is similar in appearance to painting on a layer below
 *  the existing pixels.
 */
void  behind_indexed_pixels                (const guchar *src1,
					    const guchar *src2,
					    guchar       *dest,
					    const guchar *mask,
					    int                  opacity,
					    const int           *affect,
					    int                  length,
					    int                  bytes1,
					    int                  bytes2,
					    int                  has_alpha1,
					    int                  has_alpha2);


/*  replace the contents of one pixel row with the other
 *  The operation is still bounded by mask/opacity constraints
 */
void  replace_indexed_pixels                (const guchar *src1,
					     const guchar *src2,
					     guchar       *dest,
					     const guchar *mask,
					     int                  opacity,
					     const int           *affect,
					     int                  length,
					     int                  bytes1,
					     int                  bytes2,
					     int                  has_alpha1,
					     int                  has_alpha2);


/*  apply source 2 to source 1, but in a non-additive way,
 *  multiplying alpha channels  (works for indexed)
 */
void  erase_indexed_pixels                (const guchar *src1,
					   const guchar *src2,
					   guchar       *dest,
					   const guchar *mask,
					   int                  opacity,
					   const int           *affect,
					   int                  length,
					   int                  bytes);

/*  extract information from intensity pixels based on
 *  a mask.
 */
void  extract_from_inten_pixels           (guchar       *src,
					   guchar       *dest,
					   const guchar *mask,
					   const guchar *bg,
					   int                  cut,
					   int                  length,
					   int                  bytes,
					   int                  has_alpha);

/*  extract information from indexed pixels based on
 *  a mask.
 */
void  extract_from_indexed_pixels          (guchar *src,
					    guchar       *dest,
					    const guchar *mask,
					    const guchar *cmap,
					    const guchar *bg,
					    int                  cut,
					    int                  length,
					    int                  bytes,
					    int                  has_alpha);


/*  variable source to RGB color mapping
 *  src_type == 0  (RGB)
 *  src_type == 1  (GRAY)
 *  src_type == 2  (INDEXED)
 */
void
map_to_color                              (int                  src_type,
					   const guchar *cmap,
					   const guchar *src,
					   guchar       *rgb);


/*  RGB to index mapping functions...
 *
 *  Hash table lookup speeds up the standard
 *  least squares method
 */
gint   map_rgb_to_indexed                 (const guchar        *cmap,
					   gint                 num_cols,
					   const GimpImage     *gimage,
					   gint                 r,
					   gint                 g,
					   gint                 b);


/*  Lay down the groundwork for layer construction...
 *  This includes background images for indexed or non-alpha
 *  images, floating selections, selective display of intensity
 *  channels, and display of arbitrary mask channels
 */
#define INITIAL_CHANNEL_MASK         0
#define INITIAL_CHANNEL_SELECTION    1
#define INITIAL_INDEXED              2
#define INITIAL_INDEXED_ALPHA        3
#define INITIAL_INTENSITY            4
#define INITIAL_INTENSITY_ALPHA      5

/*  Combine two source regions with the help of an optional mask
 *  region into a destination region.  This is used for constructing
 *  layer projections, and for applying image patches to an image
 */
#define COMBINE_INDEXED_INDEXED           0
#define COMBINE_INDEXED_INDEXED_A         1
#define COMBINE_INDEXED_A_INDEXED_A       2
#define COMBINE_INTEN_A_INDEXED_A         3
#define COMBINE_INTEN_A_CHANNEL_MASK      4
#define COMBINE_INTEN_A_CHANNEL_SELECTION 5
#define COMBINE_INTEN_INTEN               6
#define COMBINE_INTEN_INTEN_A             7
#define COMBINE_INTEN_A_INTEN             8
#define COMBINE_INTEN_A_INTEN_A           9

/*  Non-conventional combination modes  */
#define BEHIND_INTEN                      20
#define BEHIND_INDEXED                    21
#define REPLACE_INTEN                     22
#define REPLACE_INDEXED                   23
#define ERASE_INTEN                       24
#define ERASE_INDEXED                     25
#define ANTI_ERASE_INTEN                  26
#define ANTI_ERASE_INDEXED                27
#define NO_COMBINATION                    28

/* Opacities */
#define TRANSPARENT_OPACITY        0
#define OPAQUE_OPACITY             255


/*  Applying layer modes...  */

void apply_layer_mode_indexeda_indexed (apply_combine_layer_info *info);

void apply_layer_mode_indexeda_indexeda (apply_combine_layer_info *info);

#endif  /*  __PAINT_FUNCS_INDEXEDA_H__  */
