#include <u.h>#include <libc.h>#include <bio.h>#include <ttf.h>#include "impl.h" TTBitmap *ttfnewbitmap(int w, int h){	TTBitmap *b; 	b = mallocz(sizeof(TTBitmap), 1);	if(b == nil) return nil;	b->width = w;	b->height = h;	b->stride = w + 7 >> 3;	b->bit = mallocz(b->stride * h, 1);	if(b->bit == nil){		free(b);		return nil;	}	return b;} voidttffreebitmap(TTBitmap *b){	if(b == nil) return;	free(b->bit);	free(b);} voidttfblit(TTBitmap *dst, int dx, int dy, TTBitmap *src, int sx0, int sy0, int sx1, int sy1){	uchar *sp, *dp;	u32int b;	int x, y, ss, ds, dx1, dy1; 	if(sx0 < 0) sx0 = 0;	if(sy0 < 0) sy0 = 0;	if(sx1 > src->width) sx1 = src->width;	if(sy1 > src->height) sy1 = src->height;	if(dx < 0){		sx0 -= dx;		dx = 0;	}	if(dy < 0){		sy0 -= dy;		dy = 0;	}	dx1 = dx + sx1 - sx0;	dy1 = dy + sy1 - sy0;	if(dx1 > dst->width){		sx1 -= dx1 - dst->width;		dx1 = dst->width;	}	if(dy1 > dst->height) sy1 -= dy1 - dst->height;	if(sx1 <= sx0 || sy1 <= sy0) return;	ss = src->stride - ((sx1-1 >> 3) - (sx0 >> 3) + 1);	ds = dst->stride - ((dx1-1 >> 3) - (dx >> 3) + 1);	sp = src->bit + sy0 * src->stride + (sx0 >> 3);	dp = dst->bit + dy * dst->stride + (dx >> 3);	y = sy1 - sy0;	do{		if(sx0 >> 3 == sx1 >> 3){			b = (*sp++ << 8 & 0xff << 8-(sx0 & 7)) & -0x10000 >> (sx1 & 7);			if((sx0 & 7) == 0) b >>= 8;			x = (dx & 7) + (sx1 - sx0);		}else{			if((sx0 & 7) != 0)				b = *sp++ << 8 & 0xff << (-sx0 & 7);			else				b = 0;			x = (sx1 >> 3) - (sx0+7 >> 3);			while(--x >= 0){				b |= *sp++;				*dp++ |= b >> (dx & 7) + (-sx0 & 7);				b <<= 8;			}			if((sx1 & 7) != 0)				b |= *sp++ & -0x100 >> (sx1 & 7);			x = (dx & 7) + (-sx0 & 7) + (sx1 & 7);		}		for(; x > 0; x -= 8){			*dp++ |= b >> (dx & 7) + (-sx0 & 7);			b <<= 8;		}		sp += ss;		dp += ds;	}while(--y > 0);}