/*
    This file is part of PSPFormat, a File Format plugin for Adobe Photoshop
    Copyright (C) 2003-7 Toby Thain, toby@telegraphics.com.au

    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
*/

/* PSP File Format Specification is Copyright (C) 2000 Jasc Software, Inc.
   See http://www.jasc.com/specs/psp.asp */

enum{
	PSP_SIG_LENGTH = 32,
	PSP_LAYER_NAME_MAX = 0x100,
	PSP_BLEND_RANGE_BYTES = 40,
};

#define PSP_SIGNATURE "Paint Shop Pro Image File\012\032"
#define PSP_BLOCK_ID "~BK"

typedef struct{
	char signature[PSP_SIG_LENGTH];
	WORD major_version;
	WORD minor_version;
} PSP_file_header;

typedef struct{
	char header_id[4];
	WORD block_id;
	DWORD initial_len; // spec5 only
	DWORD block_len;
} PSP_block_header;

typedef struct{
	DWORD chunk_size; // absent from spec5
	LONG image_width;
	LONG image_height;
	DOUBLE resolution;
	BYTE res_metric;
	WORD comp_type;
	WORD bit_depth;
	WORD plane_count;
	DWORD colour_count;
	BYTE greyscale_flag;
	DWORD total_size;
	LONG active_layer;
	WORD layer_count;
	DWORD graphic_contents; // absent from spec5
	/*...unknown data...*/
} PSP_image_attr_chunk;

typedef struct{
	DWORD chunk_size; // absent from spec5
	DWORD image_count; // absent from spec5
} PSP7_composite_image_bank_chunk;

typedef struct{
	LONG width;
	LONG height;
	WORD bit_depth;
	WORD comp_type;
	WORD plane_count;
	DWORD colour_count;
	DWORD palette_entry_count;
	WORD channel_count;
} PSP5_thumbnail_attr_chunk;

typedef struct{
	DWORD chunk_size; // absent from spec5
	char name[PSP_LAYER_NAME_MAX]; // variable length string in spec6,7
	BYTE type;
	RECT image_rect;
	RECT saved_rect;
	BYTE opacity;
	BYTE blending_mode;
	BYTE flags;
	BYTE transparency_flags;
	BYTE link_group_id;
	RECT mask_rect;
	RECT saved_mask_rect;
	BYTE mask_linked;
	BYTE mask_disabled;
	BYTE invert_mask_on_blend;
	WORD blend_range_count;
	BYTE blend_range_data[PSP_BLEND_RANGE_BYTES];
	WORD bitmap_count; // absent from spec7
	WORD channel_count; // absent from spec7
	/*...unknown data...*/
	
	// utility fields - not in file format
	long datapos;
	int index; 
} PSP_layer_info_chunk;

typedef struct{
	DWORD chunk_size;
	WORD bitmap_count;
	WORD channel_count;
	/*...unknown data...*/
} PSP7_layer_bitmap_chunk;

typedef struct{
	DWORD chunk_size; // absent from spec5
	DWORD comp_length;
	DWORD uncomp_length;
	WORD bitmap_type;
	WORD channel_type;
	/*...unknown data...*/
	/* followed by Channel content... */
	
	// not part of PSP format; 
	long datapos; // file offset to channel data
} PSP_channel_info_chunk;

typedef struct{
	DWORD chunk_size; // absent from spec5
	DWORD entry_count;
	/*...unknown data...*/
} PSP_palette_info_chunk;

typedef struct{
	DWORD chunk_size; // absent from spec5
	WORD alpha_count;
	/*...unknown data...*/
} PSP_alpha_bank_info_chunk;

typedef struct{
	DWORD chunk_size; // absent from spec5
	char name[PSP_LAYER_NAME_MAX];
	RECT alpha_rect;
	RECT saved_rect;
	WORD bitmap_count; // absent from spec6,7
	WORD channel_count; // absent from spec6,7
	/*...unknown data...*/
} PSP_alpha_channel_info_chunk;

typedef struct{
	DWORD chunk_size;
	WORD bitmap_count;
	WORD channel_count;
	/*...unknown data...*/
	/* followed by Channel sub-block */
} PSP7_alpha_channel_chunk;

extern char *psp7_block_id_strings[];
#define PSP7_LAST_BLOCK_ID_STR PSP_PATTERN_BLOCK

extern char *psp7_dibtype_strings[];
#define PSP7_LAST_DIBTYPE_STR PSP_DIB_PATTERN_TRANS_MASK

extern char *psp7_channeltype_strings[];
#define PSP7_LAST_CHANNELTYPE_STR PSP_CHANNEL_BLUE

extern char *psp7_comptype_strings[];
#define PSP7_LAST_COMPTYPE_STR PSP_COMP_JPEG

extern char *psp7_layertype_strings[];
#define PSP7_LAST_LAYERTYPE_STR keGLTAdjustment