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//==========================================================================
//
// fb_draw.c
//
// Author(s): Michael Kelly - Cogent Computer Systems, Inc.
// Date: 10/18/03
// Description: generic frame buffer drawing routines - based on
// lcd.c (c) 1999 Cirrus Logic.
//
// These routines all end up calling fb_set_pixel(). That routine must
// be provided in the target specific code.
//
//==========================================================================
#include "config.h"
#include "cpuio.h"
#include "genlib.h"
#include "stddefs.h"
#include "fb_fonts.h"
#include "vga_lookup.h"
#if INCLUDE_LCD
extern uchar bcolor;
extern void fb_set_pixel(int X, int Y, uchar color);
void fb_draw_line2(int x0, int y0, int x1, int y1, uchar color)
{
int i;
int steep = 1;
int sx, sy; /* step positive or negative (1 or -1) */
int dx, dy; /* delta (difference in X and Y between points) */
int e;
/*
* optimize for vertical and horizontal lines here
*/
dx = (x1 > x0) ? (x1 - x0) : x0 - x1;
sx = ((x1 - x0) > 0) ? 1 : -1;
dy = (y1 > y0) ? (y1 - y0) : y0 - y1;
sy = ((y1 - y0) > 0) ? 1 : -1;
e = (dy << 1) - dx;
for (i = 0; i < dx; i++) {
if (steep) {
fb_set_pixel(x0,y0,color);
} else {
fb_set_pixel(y0,x0,color);
}
while (e >= 0) {
y0 += sy;
e -= (dx << 1);
}
x0 += sx;
e += (dy << 1);
}
}
// ------------------------------------------------------------------
// fb_draw_circle draws a circle at the specified location based on
// bresenham's circle drawing algorithm
void fb_draw_circle(ulong x, ulong y, ulong radius, uchar color)
{
ulong xpos, ypos, d;
xpos = x;
ypos = radius;
d = 3 - (2 * ypos);
while(ypos >= xpos)
{
fb_set_pixel(x + xpos, y + ypos, color); // point in octant 1
fb_set_pixel(x - xpos, y + ypos, color); // point in octant 4
fb_set_pixel(x - xpos, y - ypos, color); // point in octant 5
fb_set_pixel(x + xpos, y - ypos, color); // point in octant 8
fb_set_pixel(x + ypos, y + xpos, color); // point in octant 2
fb_set_pixel(x - ypos, y + xpos, color); // point in octant 3
fb_set_pixel(x - ypos, y - xpos, color); // point in octant 6
fb_set_pixel(x + ypos, y - xpos, color); // point in octant 7
if (d < 0)
{
d = (d + (4 * xpos)) + 6;
}
else
{
d = (d + (4 * (xpos - ypos))) + 10;
ypos = ypos - 1;
}
xpos++;
}
}
void fb_draw_circle2(ulong xpos, ulong ypos, ulong radius, uchar color)
{
int x;
int y = radius;
int d = -radius;
for(x = 1; x < (radius/1.414); x++)
{ d += (2 * x) - 1;
if (d >= 0)
{ y--;
d -= (2 * y); /* Must do this AFTER y-- */
}
// fb_set_pixel(x + xpos, y + ypos, color);
fb_set_pixel(xpos + x, ypos + y, color); // point in octant 1
fb_set_pixel(xpos - x, ypos + y, color); // point in octant 4
fb_set_pixel(xpos - x, ypos - y, color); // point in octant 5
fb_set_pixel(xpos + x, ypos - y, color); // point in octant 8
fb_set_pixel(xpos + y, ypos + x, color); // point in octant 2
fb_set_pixel(xpos - y, ypos + x, color); // point in octant 3
fb_set_pixel(xpos - y, ypos - x, color); // point in octant 6
fb_set_pixel(xpos + y, ypos - x, color); // point in octant 7
}
}
// ------------------------------------------------------------------
// fb_draw_circle draws a filled circle at the specified location based on
// bresenham's circle drawing algorithm
//
void fb_fill_circle(ulong x, ulong y, ulong radius, uchar color)
{
ulong xpos, ypos, d;
xpos = x;
ypos = radius;
d = 3 - (2 * ypos);
while(ypos >= xpos)
{
fb_draw_line2(x - xpos, y + ypos, x + xpos, y + ypos, color);
fb_draw_line2(x - ypos, y + xpos, x + ypos, y + xpos, color);
fb_draw_line2(x - xpos, y - ypos, x + xpos, y - ypos, color);
fb_draw_line2(x - ypos, y - xpos, x + ypos, y - xpos, color);
if(d < 0)
{
d += (4 * xpos) + 6;
}
else
{
d += 10 + (4 * (xpos - ypos));
ypos--;
}
xpos++;
}
}
// ------------------------------------------------------------------
// fb_print_char prints a character at the specified location.
//
void fb_print_char(uchar cchar, ulong x, ulong y, uchar color)
{
ulong idx1, idx2;
uchar font_line, fcolor;
// printable characters only
if ((cchar < FIRST_CHAR) || (cchar > LAST_CHAR))
return;
// loop through each row of the font.
for(idx1 = 0; idx1 < FONT_HEIGHT; idx1++)
{
// read the byte which describes this row of the font.
font_line = fb_font_data[(cchar - FIRST_CHAR) * FONT_STEP][idx1];
// loop through each column of this row.
for(idx2 = 0; idx2 < 8; idx2++)
{
// set the pixel based on the value of this bit of the font,
// using the requested or the backround color.
fcolor = font_line & 1 << ((FONT_WIDTH - 1) - idx2) ? color : bcolor;
fb_set_pixel(x + idx2, y + idx1, fcolor);
}
}
}
// ------------------------------------------------------------------
// fb_print_string prints a string at the specified location.
//
void
fb_print_string(uchar *pcbuffer, ulong x, ulong y, uchar color)
{
// loop through each character in the string.
while(*pcbuffer)
{
// print this character.
fb_print_char(*pcbuffer++, x, y, color);
// advance horizontaly past this character.
x += FONT_WIDTH;
}
}
// ------------------------------------------------------------------
// fb_print_charx2 prints a double-sized character at the specified location.
//
void fb_print_charx2(char cchar, ulong x, ulong y, uchar color)
{
ulong idx1, idx2;
ushort font_line;
uchar fcolor;
// printable characters only
if (((unsigned char)cchar < FIRST_CHAR) ||
((unsigned char)cchar > LAST_CHAR))
return;
// loop through each row of the font.
for(idx1 = 0; idx1 < FONT_HEIGHT; idx1++)
{
// read the byte which describes this row of the font.
font_line = (fb_font_data[(cchar - FIRST_CHAR) * FONT_STEP][idx1]) << 8;
if (FONT_WIDTH > 8) // get the second byte if present
{
font_line = fb_font_data[(cchar - FIRST_CHAR) * FONT_STEP][idx1 + 1];
}
// loop through each column of this row.
for(idx2 = 0; idx2 < FONT_WIDTH; idx2++)
{
// determine the color of this pixel block.
fcolor = font_line & (1 << ((FONT_WIDTH - 1) - idx2)) ? color : bcolor;
// set the pixel block (2x2) based on the value of this bit of
// the font, using the requested or the backround color.
fb_set_pixel(x + (idx2 << 1), y + (idx1 << 1), fcolor);
fb_set_pixel(x + (idx2 << 1) + 1, y + (idx1 << 1), fcolor);
fb_set_pixel(x + (idx2 << 1), y + (idx1 << 1) + 1, fcolor);
fb_set_pixel(x + (idx2 << 1) + 1, y + (idx1 << 1) + 1, fcolor);
}
}
}
// ------------------------------------------------------------------
// fb_print_stringx2 prints a string of double-sized characters at the
// specified location.
//
void fb_print_stringx2(char *pcbuffer, ulong x, ulong y, uchar color)
{
//
// loop through each character in the string.
//
while(*pcbuffer)
{
//
// print this character.
//
fb_print_charx2(*pcbuffer++, x, y, color);
//
// advance horizontaly past this character.
//
x += 16;
}
}
#endif
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