bnch_blt.c

公司vc培训的时候,给大家几个例子,比较实用,拿来分享

/*........................... BENCH_BitBlt.C ................ 2-24-96 ......*/
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <math.h>
#include <limits.h>
#include <my_tools.h>
#include <vsa.h>
#include <vsa_font.h>
/*..... #include <graph.h> .....*/

extern unsigned _stklen = 10000;        /* This is for Borland C Only ! */

void cube_3d(int,int);

float SIN_LUT[1024];

void main()
{
	char text[100];
	clock_t clk,delta;
	unsigned mode,op[5]={0,1,2,3,6};
	unsigned i,j,m[1000],n[1000],image_size,xx,yy,a,b,c,d,k,l;
	unsigned long num_loops;
	float timer,pixs[5];
	unsigned char *image;
	num_loops = 200;
/*..........................................................................*/
/*                      Initialize sin look up table.                       */
/*  Index 'i' goes from 0 to 1023 and is equivalent to 0 to 360 degrees.    */
/*..........................................................................*/
	for(i=0;i<1024;i++)
		SIN_LUT[i] = sin(i*6.28/1024.0);
	printf("input graphics mode (hex): ");
	scanf("%x",&mode);
	vsa_init(mode);
	xx = XResolution;
	yy = YResolution;

/*..........................................................................*/
/*                    Initialize array of BitBlt positions                  */
/*..........................................................................*/
	k = 0;
	l = 256;
	c = .09*xx;
	d = .12*yy;
	for(i=0;i<num_loops;i++)
		{
			m[i] = xx/2 - c/2 + (i)*SIN_LUT[k];
			n[i] = yy/2 - d/2 + (i)*SIN_LUT[l];
			k-=32;
			l-=32;
			k=k & 0x3ff;
			l=l & 0x3ff;
		}
/*..........................................................................*/
/*                  Allocate memory for image array                         */
/*..........................................................................*/
	image_size = vsa_image_size(0,0,c,d);
	if((image = malloc(image_size)) == NULL)
		{
			vsa_write_string(0,0,31,"Error allocating memory for IMAGE");
			getch();
			goto BAIL;
		}
	for(j=0;j<5;j++)   /* restore to j<5 !!! */
		{
			vsa_set_color(0);
			vsa_move_to(0,0);
			vsa_rect_fill(xx-1,yy-1);
/*..........................................................................*/
/*             Draw color look up table at bottom of screen.                */
/*..........................................................................*/
			rainbow_lut();
			a = .125*xx;
			b = .83*yy;
			color_bar(a,b);
/*..........................................................................*/
/*                    Draw a 3-D shaded Cube                                */
/*..........................................................................*/
			a = .5*xx;
			b = .35*yy;
			cube_3d(a,b);
			a = .495*xx;
			b = .295*yy;
			vsa_get_image(a,b,a+c,b+d,image);
			vsa_set_color(255);
			vsa_move_to(a,b);
			vsa_rect(a+c,b+d);

			clk = clock();
			for(i=0;i<num_loops;i++)
				vsa_put_image(m[i],n[i],image,op[j]);
			delta = clock() - clk;

			timer = ((float)(delta))/((float)CLOCKS_PER_SEC);
			if(timer == 0) timer = .000001;
			pixs[j] = ((float)(num_loops)*(c+1L)*(d+1L))/timer;
		}
	sprintf(text,"BitBlt: Drawing Rate (Replace) = %f Pixels/sec\n",pixs[0]);
	vsa_write_string(10,10,15,text);
	sprintf(text,"BitBlt: Drawing Rate     (AND) = %f Pixels/sec\n",pixs[1]);
	vsa_write_string(10,25,15,text);
	sprintf(text,"BitBlt: Drawing Rate      (OR) = %f Pixels/sec\n",pixs[2]);
	vsa_write_string(10,40,15,text);
	sprintf(text,"BitBlt: Drawing Rate     (XOR) = %f Pixels/sec\n",pixs[3]);
	vsa_write_string(10,55,15,text);
	sprintf(text,"BitBlt: Drawing Rate  (Sprite) = %f Pixels/sec\n",pixs[4]);
	vsa_write_string(10,70,15,text);
  free(image);
	getch();
BAIL:
	vsa_init(0x03);
	return;
}

void cube_3d(int a,int b)
{
	int dy,dx,dd;
	dx = .045*XResolution;
	dy = .06*YResolution;
	dd = .5*dx;
	vsa_shaded_triangle(a,b,75,a+dx,b,91,a+dx,b+dy,75);
	vsa_shaded_triangle(a,b,75,a,b+dy,49,a+dx,b+dy,75);
	a+= 0.05*dx;
	b-= 0.2*dy;
	vsa_shaded_triangle(a,b,75,a+dx,b,91,a+3*dd,b-dd,75);
	vsa_shaded_triangle(a,b,75,a+dd,b-dd,49,a+3*dd,b-dd,75);
	a+= 0.15*dx;
	b+= 0.15*dy;
	vsa_shaded_triangle(a+dx,b+dy,75,a+dx,b,91,a+3*dd,b-dd,75);
	vsa_shaded_triangle(a+dx,b+dy,75,a+3*dd,b+dy-dd,49,a+3*dd,b-dd,75);
	return;
}