graphic24.cpp

一个GNU的开源软件,基于linux下X-Window的flash播放器,工作稳定,方便移植和修改

                    v = r>>16;
                    mix_alpha(point, ramp[v], end_alpha);
		}
#endif /* FULL_AA */
            } else {
                while (n--) {
                    v = r>>16;
                    cp = &ramp[v];
                    mix_alpha(point, *cp, cp->alpha);
                    point+=BPP;
                    r += dr;
                }
            }
        } else {
            if (!grad->has_alpha) {
#ifdef FULL_AA
		if (start_alpha < 255) {
                    v = r>>16;
                    if (v < 0) v = 0;
                    else if (v > 255) v = 255;
                    mix_alpha(point, ramp[v], start_alpha);
                    point+=BPP;
                    r += dr;
		    n--;
		}
#endif /* FULL_AA */
                while (n>0) {
                    v = r>>16;
                    if (v < 0) v = 0;
                    else if (v > 255) v = 255;
                    *point++ = ramp[v].blue;
                    *point++ = ramp[v].green;
                    *point++ = ramp[v].red;
                    r += dr;				
		    n--;
                }
#ifdef FULL_AA
		if (end_alpha > 0) {
                    v = r>>16;
                    if (v < 0) v = 0;
                    else if (v > 255) v = 255;
                    mix_alpha(point, ramp[v], end_alpha);
		}
#endif /* FULL_AA */
            } else {
                while (n--) {
                    v = r>>16;
                    if (v < 0) v = 0;
                    else if (v > 255) v = 255;
                    cp = &ramp[v];
                    mix_alpha(point, *cp, cp->alpha);
                    point+=BPP;
                    r += dr;
                }
            }
        }
}

void
GraphicDevice24::fillLineRG(Gradient *grad, long y, long start, long end)
{
	long X,dx,r,Y,dy;
	long dist2;
	register long   n;
        Color *cp,*ramp;
	TYPE *line;							
	TYPE *point;							
        Matrix *m = &grad->imat;
        unsigned int start_alpha,end_alpha;

	if (clip(y,start,end)) return;

        start_alpha = 255 - ((start & (FRAC-1)) << (8-FRAC_BITS));
        end_alpha = (end & (FRAC-1)) << (8-FRAC_BITS);
        
	start /= FRAC;
	end /= FRAC;

	n = end-start;
        
        X = (long) (m->a * start + m->b * y + m->tx);
        Y = (long) (m->c * start + m->d * y + m->ty);
        dx = (long) (m->a);
        dy = (long) (m->c);

        ramp = grad->ramp;
									
	line = (TYPE *)(canvasBuffer + bpl*y);
	point = &line[start*BPP];
			     
        if (!grad->has_alpha) {
#ifdef FULL_AA
		if (start == end) {
			dist2 = ((X>>16)*(X>>16))+((Y>>16)*(Y>>16));
			if ((unsigned long)dist2 >= 65536) {
			    r = 255;					
			} else {						
			    r= SQRT[dist2];	
			}
			mix_alpha(point, ramp[r], start_alpha + end_alpha - 255);
		} else {
		    if (start_alpha < 255) {
			dist2 = ((X>>16)*(X>>16))+((Y>>16)*(Y>>16));
			if ((unsigned long)dist2 >= 65536) {
			    r = 255;					
			} else {						
			    r= SQRT[dist2];	
			}
			mix_alpha(point, ramp[r], start_alpha);
			point+=BPP;
			X += dx;						
			Y += dy;						
			n--;
		    }
#endif /* FULL_AA */
		    while (n>0) {					
			dist2 = ((X>>16)*(X>>16))+((Y>>16)*(Y>>16));
			if ((unsigned long)dist2 >= 65536) {
			    r = 255;					
			} else {						
			    r= SQRT[dist2];	
			}
			*point++ = ramp[r].blue;
			*point++ = ramp[r].green;
			*point++ = ramp[r].red;
			X += dx;						
			Y += dy;						
			n--;
		    }		
#ifdef FULL_AA
		    if (end_alpha > 0) {
			dist2 = ((X>>16)*(X>>16))+((Y>>16)*(Y>>16));
			if ((unsigned long)dist2 >= 65536) {
			    r = 255;					
			} else {						
			    r= SQRT[dist2];	
			}
			mix_alpha(point, ramp[r], end_alpha);
		    }
		}
#endif /* FULL_AA */

        } else {
            while (n--) {					
		dist2 = ((X>>16)*(X>>16))+((Y>>16)*(Y>>16));
		if ((unsigned long)dist2 >= 65536) {
                    r = 255;					
		} else {						
                    r= SQRT[dist2];	
		}
                cp = &ramp[r];
		mix_alpha(point, *cp, cp->alpha);
		point+=BPP;
		X += dx;						
		Y += dy;						
            }		
        }
}

void
GraphicDevice24::drawLine(long x1, long y1, long x2, long y2, long width)
{
    int n,adr,dx,dy,sx;
    Color color;
    register int a;
    register TYPE *pp;
    int alpha;

    x1 = (x1) >> FRAC_BITS;
    y1 = (y1) >> FRAC_BITS;
    x2 = (x2) >> FRAC_BITS;
    y2 = (y2) >> FRAC_BITS;
    
    if (y1 > y2 || (y1 == y2 && x1 > x2)) {
        long tmp;

        tmp=x1;
        x1=x2;
        x2=tmp;

        tmp=y1;
        y1=y2;
        y2=tmp;
    }

    if (y1 == y2 && (y1 < clip_rect.ymin || y1 > clip_rect.ymax)) return;
    if (x1 == x2 && (x1 < clip_rect.xmin || x1 > clip_rect.xmax)) return;
    if (x1 == x2 && y1 == y2) return;	// Bad !!!

    if (y1 < clip_rect.ymin && y1 != y2) {
	x1 += (x2-x1)*(clip_rect.ymin-y1)/(y2-y1);
	y1 = clip_rect.ymin;
    }

    if (y2 > clip_rect.ymax && y1 != y2) {
	x2 -= (x2-x1)*(y2-clip_rect.ymax)/(y2-y1);
	y2 = clip_rect.ymax;
    }

    if (x1 < x2) {
	    if (x1 < clip_rect.xmin && x1 != x2) {
		y1 += (y2-y1)*(clip_rect.xmin-x1)/(x2-x1);
		x1 = clip_rect.xmin;
	    }

	    if (x2 > clip_rect.xmax && x1 != x2) {
		y2 -= (y2-y1)*(x2-clip_rect.xmax)/(x2-x1);
		x2 = clip_rect.xmax;
	    }
    }

    if (x1 > x2) {
	    if (x2 < clip_rect.xmin && x2 != x1) {
		y2 -= (y2-y1)*(clip_rect.xmin-x2)/(x1-x2);
		x2 = clip_rect.xmin;
	    }

	    if (x1 > clip_rect.xmax && x2 != x1) {
		y1 += (y2-y1)*(x1-clip_rect.xmax)/(x1-x2);
		x1 = clip_rect.xmax;
	    }
    }

    // Check again
    if (x1 == x2 && y1 == y2) return;
    if (x1 < clip_rect.xmin || x2 < clip_rect.xmin) return;
    if (y1 < clip_rect.ymin || y2 < clip_rect.ymin) return;
    if (x1 > clip_rect.xmax || x2 > clip_rect.xmax) return;
    if (y1 > clip_rect.ymax || y2 > clip_rect.ymax) return;

    sx=bpl >> 1;
    adr=(y1 * sx + x1);
    pp = (TYPE *)canvasBuffer + adr;
    
    dx = x2 - x1;
    dy = y2 - y1;

    color = foregroundColor;
    alpha = foregroundColor.alpha;

    if (alpha == ALPHA_OPAQUE) {

#define PUTPIXEL() 				\
  {						\
      *pp++=color.red;		                \
      *pp++=color.green;	                \
      *pp++=color.blue;		                \
  }

#define DRAWLINE(dx,dy,inc_1,inc_2) \
    n=dx;\
    a=2*dy-dx;\
    dy=2*dy;\
    dx=2*dx-dy;\
	 do {\
      PUTPIXEL();\
			if (a>0) { pp+=(inc_1); a-=dx; }\
			else { pp+=(inc_2); a+=dy; }\
	 } while (--n >= 0);

/* fin macro */

  if (dx == 0 && dy == 0) {
    PUTPIXEL();
  } else if (dx > 0) {
    if (dx >= dy) {
      DRAWLINE(dx, dy, sx + 1, 1);
    } else {
      DRAWLINE(dy, dx, sx + 1, sx);
    }
  } else {
    dx = -dx;
    if (dx >= dy) {
      DRAWLINE(dx, dy, sx - 1, -1);
    } else {
      DRAWLINE(dy, dx, sx - 1, sx);
    }
  }


#undef DRAWLINE
#undef PUTPIXEL
    } else {
#define PUTPIXEL() 				\
  {						\
      mix_alpha(pp,color,alpha);	        \
  }

#define DRAWLINE(dx,dy,inc_1,inc_2) \
    n=dx;\
    a=2*dy-dx;\
    dy=2*dy;\
    dx=2*dx-dy;\
	 do {\
      PUTPIXEL();\
		if (a>0) { pp+=(inc_1*BPP); a-=dx; }\
		else { pp+=(inc_2*BPP); a+=dy; }\
	 } while (--n >= 0);

/* fin macro */

  if (dx == 0 && dy == 0) {
    PUTPIXEL();
  } else if (dx > 0) {
    if (dx >= dy) {
      DRAWLINE(dx, dy, sx + 1, 1);
    } else {
      DRAWLINE(dy, dx, sx + 1, sx);
    }
  } else {
    dx = -dx;
    if (dx >= dy) {
      DRAWLINE(dx, dy, sx - 1, -1);
    } else {
      DRAWLINE(dy, dx, sx - 1, sx);
    }
  }


#undef DRAWLINE
#undef PUTPIXEL
    }
}