nxview.c

PictureBrowser 是基于Altera 的DE2 开发板设计图像浏览器

/*
 * Copyright (c) 2000, 2001 Greg Haerr <[e-mail]>
 *
 * nxview - Nano-X image viewer
 *
 * Autorecognizes and displays BMP, GIF, JPEG, PNG and XPM files
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/time.h>
#define MWINCLUDECOLORS
#include "nano-X.h"

int
main(int argc,char **argv)
{
	GR_IMAGE_ID	image_id;
	GR_WINDOW_ID	window_id;
	GR_GC_ID	gc_id;
	GR_SIZE		w = -1;
	GR_SIZE		h = -1;
	GR_EVENT	event;
	GR_SCREEN_INFO	sinfo;
	GR_IMAGE_INFO	info;
	char		title[256];
	//time_t begintime;             // use to find running time
	//time_t endtime;
	//time_t runtime;

	//begintime = time (NULL);
	struct timeval eval_time;
  	struct timeval start_time;
  	struct timeval end_time;
  	gettimeofday(&start_time, NULL);

	if (argc < 2) {
		printf("Usage: nxview <image file> [stretch]\n");
		exit(1);
	}

	if (GrOpen() < 0) {
		fprintf(stderr, "cannot open graphics\n");
		exit(1);
	}
	
	if (!(image_id = GrLoadImageFromFile(argv[1], 0))) {
		fprintf(stderr, "Can't load image file: %s\n", argv[1]);
		exit(1);
	}

	if(argc > 2) {
		/* stretch to half screen size*/
		GrGetScreenInfo(&sinfo);
		printf("I am here");
		w = sinfo.cols/2;
		h = sinfo.rows/2;
	} else {
		GrGetImageInfo(image_id, &info);
		w = info.width;
		h = info.height;
	}

	sprintf(title, "nxview %s", argv[1]);
	window_id = GrNewWindowEx(GR_WM_PROPS_APPWINDOW, title,
		GR_ROOT_WINDOW_ID, (640 - w)/2, (480 - h)/2, w, h, BLACK);
	/*window_id = GrNewWindowEx(GR_WM_PROPS_APPWINDOW, title,
		GR_ROOT_WINDOW_ID, 0, 0, w, h, BLACK);*/

	GrSelectEvents(window_id,
		GR_EVENT_MASK_CLOSE_REQ|GR_EVENT_MASK_EXPOSURE);

	GrMapWindow(window_id);

	gc_id = GrNewGC();

	//endtime = time(NULL);
	gettimeofday(&end_time, NULL);
  	int eval_secs = end_time.tv_sec - start_time.tv_sec;
  	int eval_usecs = end_time.tv_usec - start_time.tv_usec;
  
  	if (eval_usecs < 0) {
		eval_secs -= 1;
		eval_usecs += 1000000;
	}
  	int eval_msecs = eval_usecs/1000;
  	printf("Runnig time: %d secs, %d msecs", eval_secs, eval_msecs);
	//printf("Running time: %d seconds", endtime - begintime);

	while (1) {
		GrGetNextEvent(&event);
		switch(event.type) {
		case GR_EVENT_TYPE_CLOSE_REQ:
			GrDestroyWindow(window_id);
			GrDestroyGC(gc_id);
			GrFreeImage(image_id);
			GrClose();
			exit(0);
			/* no return*/
		case GR_EVENT_TYPE_EXPOSURE:
			GrDrawImageToFit(window_id, gc_id, 0,0, w,h, image_id);
			
			break;
		}
	}
	
	//endtime = time(NULL);
	
	return 0;
}