SaveDraw

/* Copyright 1997 Acorn Computers Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/***************************************************/
/* File   : SaveDraw.h                             */
/*                                                 */
/* Purpose: Save a web page as a Draw file.        */
/*                                                 */
/* Author : Merlyn Kline for Customer browser;    */
/*          This source adapted by A.D.Hodgkinson  */
/*          including bits from RISC_OSLib.        */
/*                                                 */
/* History: 13-Nov-97: Created.                    */
/***************************************************/

/* General bits and pieces */

typedef enum
{
  draw_OBJFONTLIST = 0,
  draw_OBJTEXT     = 1,
  draw_OBJPATH     = 2,
  draw_OBJSPRITE   = 5,
  draw_OBJGROUP    = 6,
  draw_OBJTEXTAREA = 9,
  draw_OBJTEXTCOL  = 10,
  draw_OBJTEXTTRFM = 12
}
draw_tagtyp;

typedef int  draw_sizetyp;
typedef BBox draw_bboxtyp;
typedef int  draw_coltyp;

/* For paths */

typedef int draw_pathwidth;

typedef struct
{
  unsigned char joincapwind; /* 1 byte  */ /* bit 0..1 join         */
                                           /* bit 2..3 end cap      */
                                           /* bit 4..5 start cap    */
                                           /* bit 6    winding rule */
                                           /* bit 7    dashed       */
  unsigned char reserved8;   /* 1 byte  */
  unsigned char tricapwid;   /* 1 byte  */ /* 1/16th of line width */
  unsigned char tricaphei;   /* 1 byte  */ /* 1/16th of line width */
}
draw_pathstyle;

typedef enum
{
   draw_PathTERM  = 0, /* end of path                                   */
   draw_PathMOVE  = 2, /* move to (x,y), starts new subpath             */
   draw_PathLINE  = 8, /* line to (x,y)                                 */
   draw_PathCURVE = 6, /* bezier curve to (x3,y3) with 2 control points */
   draw_PathCLOSE = 5  /* close current subpath with a line             */
}
draw_path_tagtype;

/* For text */

typedef char draw_fontref;

typedef struct
{
  draw_fontref fontref;    /* 1 byte  */
  char         reserved8;  /* 1 byte  */
  short        reserved16; /* 2 bytes */
}
draw_textstyle;

typedef unsigned int draw_fontsize;

typedef struct
{
  int         typeface;   /* Index into fontname table */
  int         typesizex;
  int         typesizey;
  draw_coltyp textcolour; /* Text colour RGB */
  draw_coltyp background; /* Hint for anti-aliased printing RGB */
}
fontrec;


/* Path structure header item */

typedef struct
{
  draw_tagtyp     tag;         /* 1 word  */
  draw_sizetyp    size;        /* 1 word  */
  draw_bboxtyp    bbox;        /* 4 words */
  draw_coltyp     fillcolour;  /* 1 word  */
  draw_coltyp     pathcolour;  /* 1 word  */
  draw_pathwidth  pathwidth;   /* 1 word  */
  draw_pathstyle  pathstyle;   /* 1 word  */
}
draw_pathstrhdr;

/* Sprite header */

typedef struct
{
  draw_tagtyp  tag;  /* 1 word  */
  draw_sizetyp size; /* 1 word  */
  draw_bboxtyp bbox; /* 4 words */
}
draw_spristrhdr;

/* A line of text (maybe transformed) */

typedef struct
{
  int x;
  int y;
}
draw_objcoord;

typedef struct
{
  draw_tagtyp    tag;        /* 1 word  */
  draw_sizetyp   size;       /* 1 word  */
  draw_bboxtyp   bbox;       /* 4 words */
  draw_coltyp    textcolour; /* 1 word  */
  draw_coltyp    background; /* 1 word  */
  draw_textstyle textstyle;  /* 1 word  */
  draw_fontsize  fsizex;     /* 1 word, unsigned */
  draw_fontsize  fsizey;     /* 1 word, unsigned */
  draw_objcoord  coord;      /* 2 words */
}
draw_textstrhdr;

#define SaveDraw_FontFlags_Kerned      (1u<<0)
#define SaveDraw_FontFlags_RightToLeft (1u<<1)

typedef struct
{
  draw_tagtyp    tag;        /* 1 word  */
  draw_sizetyp   size;       /* 1 word  */
  draw_bboxtyp   bbox;       /* 4 words */
  int            matrix[6];
  unsigned int   fontflags;
  draw_coltyp    textcolour; /* 1 word  */
  draw_coltyp    background; /* 1 word  */
  draw_textstyle textstyle;  /* 1 word  */
  draw_fontsize  fsizex;     /* 1 word, unsigned */
  draw_fontsize  fsizey;     /* 1 word, unsigned */
  draw_objcoord  coord;      /* 2 words */
}
draw_trfmtextstrhdr;

/* File header */

typedef struct
{
  char         title[4];

  int          majorstamp;
  int          minorstamp;
  char         progident[12];

  draw_bboxtyp bbox;
}
draw_fileheader;

/* General header for graphic objects */

typedef struct
{
  draw_tagtyp  tag;  /* 1 word  */
  draw_sizetyp size; /* 1 word  */
  draw_bboxtyp bbox; /* 4 words */
}
draw_objhdr;

/* A font list */

typedef struct
{
  draw_tagtyp  tag;  /* 1 word  */
  draw_sizetyp size; /* 1 word  */
}
draw_fontliststrhdr;

typedef struct
{
  draw_tagtyp  tag;
  draw_sizetyp size;

  draw_fontref fontref;
  char         fontname[1]; /* String, null terminated */
}
draw_fontliststr;

/* For sprites */

typedef struct /* Format of a sprite header */
{
  int  next;      /*  Offset to next sprite                */
  char name[12];  /*  Sprite name                          */
  int  width;     /*  Width in words-1      (0..639)       */
  int  height;    /*  Height in scanlines-1 (0..255/511)   */
  int  lbit;      /*  First bit used (left end of row)     */
  int  rbit;      /*  Last bit used (right end of row)     */
  int  image;     /*  Offset to sprite image               */
  int  mask;      /*  Offset to transparency mask          */
  int  mode;      /*  Mode sprite was defined in           */
                  /*  Palette data optionally follows this */
                  /*  in memory                            */
}
sprite_header;

typedef struct
{
 int width;
 int height;
 int mask;
 int mode;
}
sprite_info;

/* We're going to fix scale factors for OS units and points */
/* to Draw units.                                           */

#define PTD(x) (((x)*16)/25) /* Convert millipoints to draw units */
#define OTD(x) ((x)*256)     /* Convert OS units to draw units    */

/* Some miscellaneous useful definitions */

#define DSIZE_FRECT (sizeof(draw_pathstrhdr)+5*12+4)
#define DSIZE_FTRIA (sizeof(draw_pathstrhdr)+4*12+4)

/* Function prototypes */

int               savedraw_write_bytes    (const char * s, unsigned int n);
int               savedraw_rectangle_fill (int x, int y, int w, int h, int c);

_kernel_oserror * savedraw_save_draw      (browser_data * b, const char * pathname, int bgimages);
int               savedraw_draw_size      (browser_data * b, int bgimages);