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#ifndef lint
static char SccsId[] = "%W% %G%";
#endif
/* Module: MakeBorder.c
* Purpose: Create bitmap with border pattern for drawing button.
* Subroutines: btn_MakeBdrBitmap() returns: void
* Subroutines: static btn_ReverseByte() returns: unsigned char
* Subroutines: static RightBorder() returns: void
* Xlib calls: none
* Copyright: 1987, 1989, 1990, 1995 Smithsonian Astrophysical Observatory
* You may do anything you like with this file except remove
* this copyright. The Smithsonian Astrophysical Observatory
* makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without
* express or implied warranty.
* Modified: {0} Michael VanHilst initial version 31 December 1987
* {1} MVH X11 version, chars instead of shorts 16 March 1989
* {2} MVH form defines all 4 corners uniquely 26 March 1990
* {3} Doug Mink cast before shifting right 4 May 1995
* {n} <who> -- <does what> -- <when>
*/
/*
* Subroutine: btn_MakeBdrBitmap
* Purpose: Fill a bitmap of an empty button with a border pattern made
* from the given form.
* Returns: void
* Called by: btn_LabelButtons() in MakeBox.c
* Uses: btn_ReverseByte(), btn_RightBorder() below
* Xlib calls: none
* Post-state: bitmap buffer allocated and filled
* Method: Creates rectangular button bitmap (no symmetry assumed). The
* pattern form is 32x32 with all 4 edges of button.
* Note: For each byte, bit 0 (0x01) appears on the left.
* Note: For each byte, bit 7 (0x80) appears on the right.
*/
void btn_MakeBdrBitmap ( buttonmap, width, height, byte_width, form, inverse )
unsigned char *buttonmap; /* i,o: pointer to bitmap of button */
int width, height; /* i: dimensions of button window (to cover) */
int byte_width; /* i: bytes in one line or row */
unsigned char *form; /* i: ptr to pattern form for entier button */
int inverse; /* i: flag to invert bits (reverse video) */
{
unsigned char *top_line; /* l: ptr to line from top in buttonmap */
unsigned char *bottom_line; /* l: ptr to line from bottom in buttonmap */
unsigned char *top_form; /* l: ptr to current top row in form */
unsigned char *bottom_form; /* l: ptr to current bottom row in form */
int form_rows; /* l: number of rows of form to use */
int row; /* l: loop counter */
int right_form_byte; /* l: index of first right form byte to use */
int right_form_bit; /* l: bit in first right form byte to use */
int right_bdr_byte; /* l: index of first line byte for right bdr */
int right_bdr_bit; /* l: bit in first line byte for right bdr */
static unsigned char btn_ReverseByte();
static void btn_MakeBdrLine();
/* portion of pattern form used (clip overlap if button very small) */
/* middle overlap on odd size counted for height, omitted for width */
if( height >= 32 )
form_rows = 16;
else
form_rows = (height + 1) / 2;
/* buttonmap byte index for first byte of top and bottom lines */
top_line = buttonmap;
bottom_line = &buttonmap[(height - 1) * byte_width];
/* normal starting point in reverse form for right border work */
right_form_byte = 0;
right_form_bit = 0;
/* determine parameters form making right border */
if( width >= 32 ) {
right_bdr_byte = (width - 16) / 8;
right_bdr_bit = width & 0x0007;
} else if( width == 31 ) {
right_bdr_byte = 2;
right_bdr_bit = 0;
right_form_bit = 1;
} else {
if( width > 14 ) {
right_bdr_byte = 1;
right_bdr_bit = (width - 15) / 2;
} else {
right_bdr_byte = 0;
right_bdr_bit = (width + 1) / 2;
}
if( width > 17 ) {
right_form_bit = 16 - (width / 2);
} else {
right_form_byte = 1;
right_form_bit = 8 - (width / 2);
}
}
top_form = form;
/* bottom line of 4 x 32 byte form */
bottom_form = form + 124;
/* do top and bottom border patterns */
for( row=0; row<form_rows; row++ ) {
btn_MakeBdrLine(top_line, top_form, byte_width, inverse, right_bdr_byte,
right_bdr_bit, right_form_byte, right_form_bit);
if( top_line != bottom_line )
btn_MakeBdrLine(bottom_line, bottom_form, byte_width, inverse,
right_bdr_byte, right_bdr_bit,
right_form_byte, right_form_bit);
top_form += 4;
bottom_form -= 4;
top_line += byte_width;
bottom_line -= byte_width;
}
/* working from where we left at bottom, up to where we left at top */
top_line -= byte_width;
while( top_line < bottom_line ) {
/* duplicate the lowest line of the upper pattern */
bcopy((char *)top_line, (char *)bottom_line, byte_width);
bottom_line -= byte_width;
}
}
/*
* Subroutine: btn_MakeBdrLine
* Purpose: set the bits for one line of the button's border
*/
static void btn_MakeBdrLine ( line, form, byte_width, inverse,
right_bdr_byte, right_bdr_bit,
right_form_byte, right_form_bit )
unsigned char *line; /* l: ptr to line from top in buttonmap */
unsigned char *form; /* l: ptr to current top row in form */
int byte_width; /* i: bytes in one line or row */
int inverse; /* i: flag to invert bits (reverse video) */
int right_form_byte; /* l: index of first right form byte to use */
int right_form_bit; /* l: bit in first right form byte to use */
int right_bdr_byte; /* l: index of first line byte for right bdr */
int right_bdr_bit; /* l: bit in first line byte for right bdr */
{
static void btn_RightBorder();
/* copy in top left, store reverse for top right */
*line = *form;
*(line+1) = *(++form);
/* fill middle across the row */
if( *form & 0x80 ) {
int i; /* l: byte index offset and loop counter */
for( i=2; i<=right_bdr_byte; i++ )
line[i] = 0xff;
}
/* else not needed since btn_Alloc cleared all bits anyway */
/* would be - bzero((char *)(top_line + 2, right_bdr_byte - 1); */
/* do the right side using 3rd and 4th byte in form row */
btn_RightBorder((++form), line + right_bdr_byte,
right_form_byte, right_form_bit, right_bdr_bit);
if( inverse ) {
int i;
for( i=0; i<byte_width; i++ )
line[i] = 0xff - line[i];
}
}
#ifdef UNNEEDED
/*
* Subroutine: btn_ReverseByte
* Purpose: Get byte with bits in reverse order of that given
* Returns: Unsigned byte which is mirror copy of byte given
* Called by: btn_MakeBdrBitmap() above
* Uses: flip[] below
* Xlib calls: none
* Method: Does lookup on 4bit pattern, using index of original 4bit value
*/
static unsigned char flip[16] = {
0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf
};
static unsigned char btn_ReverseByte ( byte )
unsigned char byte;
{
unsigned char reverse;
reverse = flip[byte >> 4];
reverse += flip[byte & 0xf] << 4;
return( reverse );
}
#endif
/*
* Subroutine: btn_RightBorder
* Purpose: Set the bits for the right border pattern
* Returns: void
* Called by: btn_MakeBdrBitmap() above
* Uses: rmask[] and lmask[] below
* Xlib calls: none
* Post-state: bitmap buffer line right border bits set
* Method: Given 2 byte pattern, byte and bit numbers, and bimtap byte
* pointer and bit number, copy to end of 2nd pattern byte.
* Note: bit 0 (0x01) appears to the left of bit 7 (0x80).
*/
/* mask of ones for bits included at index and to the right */
static unsigned char rmask[8] = { 0xff,0xfe,0xfc,0xf8,0xf0,0xe0,0xc0,0x80 };
/* mask of ones for bits included at index and to the left */
static unsigned char lmask[8] = { 0x00,0x01,0x03,0x07,0x0f,0x1f,0x3f,0x7f };
static void btn_RightBorder ( src, dst, src_byte, src_bit, dst_bit )
unsigned char *src; /* i: ptr to two reversed form pattern bytes */
unsigned char *dst; /* i: ptr to first map byte affected */
int src_byte; /* i: index of first form pattern byte used */
int src_bit; /* i: bit in first source byte (7 on left) */
int dst_bit; /* i: bit in dst (7 on left) */
{
/* if there is perfect allignment, easy work and no shift */
if( src_bit == dst_bit ) {
*dst = (*dst & lmask[dst_bit]) | (src[src_byte] & rmask[src_bit]);
if( src_byte < 1 )
dst[1] = src[1];
return;
}
/* do segment by segment, advancing apropriate byte each time */
do {
if( dst_bit > src_bit ) {
*dst = (*dst & lmask[dst_bit]) |
((src[src_byte] & rmask[src_bit]) << (dst_bit - src_bit));
src_bit += (8-dst_bit);
dst_bit = 0;
dst++;
} else {
*dst = (*dst & lmask[dst_bit]) |
((unsigned char)(src[src_byte] & rmask[src_bit]) >> (unsigned int)(src_bit - dst_bit));
dst_bit += (8-src_bit);
src_bit = 0;
src_byte++;
}
} while( src_byte < 2 );
}
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