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#include "Gfx.h"
#include "Kullers.h"
static void *bitmap = (void*)0;
unsigned long g_width, g_height;
unsigned long minx, miny, maxx, maxy;
void Gfx_init( void *offscreen, int width, int height ) {
maxx = g_width = width;
maxy = g_height = height;
bitmap = offscreen;
minx = miny = 0;
}
void Gfx_destroy( void ) {
// if( bitmap )
// free( bitmap );
}
void Gfx_clear( void ) {
unsigned long *dest = ((unsigned long *)bitmap) + miny * g_width + minx;
int nochy = maxy - miny;
while( nochy-- ) {
memset( dest, 0, (maxx - minx) << 2);
dest += g_width;
}
minx = g_width; miny = g_height;
maxx = 0; maxy = 0;
}
int getkulleroff( int radius ) {
int sum = 0;
while( --radius>0 )
sum += radius*radius;
return sum;
}
void Gfx_kuller( int x, int y, int radius, unsigned long r, unsigned long g, unsigned long b ) {
unsigned long *dest = ((unsigned long *)bitmap) + y * g_width + x;
unsigned char *src = Kullers + getkulleroff( radius ) - 1;
int xoffs = g_width - radius;
int nochy = radius;
if( minx > x ) minx = x;
if( miny > y ) miny = y;
if( maxx < x + radius ) maxx = x + radius;
if( maxy < y + radius ) maxy = y + radius;
while( nochy-- >0 ) {
int nochx = radius;
while( nochx-- >0 ) {
if( *(++src) ) {
int this_r = ((r * (int)*src) >> 8);
int this_g = ((g * (int)*src) >> 8);
int this_b = ((b * (int)*src) >> 8);
*(dest++) = (this_r<<16) | (this_g<<8) | this_b;
} else {
dest++;
}
}
dest += xoffs;
}
}
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