loadbmp.c

在ARM2410开发板的LCD上显示未加密bmp图片的源码

/***************************************************
  Copyright(C), 2008 , JUST
  File name: loadbmp.c
  Author: StevenZ    Version: 1.0     Date: 08/09/06
  Description: loadbmp.h文件的实现
	    利用FrameBuffer做的图片载入和定点显示
            ps:只能为24位色.bmp无压缩图片 
  History:
    08/08/31	完成初步功能:清屏,定位(根据屏幕位置)显示图片
    08/09/03	添加根据触摸屏所得位置显示图片
    08/09/06      小小修正 
    08/09/24     替换逐像素画图,提高显示速度 
***************************************************/

#include "./inc/loadbmp.h"
#include "./inc/fbapi.h"

int USE_TMS=1;  //1:使用TMS(透明色),0:不使用TMS

/*装入图片,填充图片结构体*/
int LoadBitmapFromFile(BITMAP *pBitmap,const char *filename)
{
	int bm_fd;
	unsigned int t_uint;
	//long t_long;
	int t_int;
	char temp[8];
	/*pBitmap->bmName=(char *)malloc(sizeof(filename)+1);
	if(pBitmap->bmName==NULL)
		return -1;*/
	strcpy(pBitmap->bmName,filename);
	bm_fd=open(pBitmap->bmName,O_RDWR);
	if(bm_fd<=0)
		return -2;
	/*文件标识,2bytes*/
	read(bm_fd,temp,2);
	pBitmap->bmBF.bfType=(temp[1]<<8)|temp[0];
	
	/*整个文件大小,4bytes*/
	read(bm_fd,temp,4);
	pBitmap->bmBF.bfSize=(temp[3]<<24)|(temp[2]<<16)|(temp[1]<<8)|temp[0];

	/*保留,4bytes,必为0*/
	read(bm_fd,temp,4);
	t_uint=(temp[3]<<24)|(temp[2]<<16)|(temp[1]<<8)|temp[0];
	if(t_uint!=0)
		return -3;
	pBitmap->bmBF.bfReserved1=t_uint;
	pBitmap->bmBF.bfReserved2=t_uint;
	
	/*从文件开始到位图数据的偏移,4bytes*/
	read(bm_fd,temp,4);
	pBitmap->bmBF.bfOffBits=(temp[3]<<24)|(temp[2]<<16)|(temp[1]<<8)|temp[0];

	/*位图文件头长度,4bytes*/
	read(bm_fd,temp,4);
	pBitmap->bmBMI.bmiHeader.biSize=(temp[3]<<24)|(temp[2]<<16)|(temp[1]<<8)|temp[0];

	/*宽度,像素为单位,4bytes*/
	read(bm_fd,temp,4);
	pBitmap->bmBMI.bmiHeader.biWidth=(temp[3]<<24)|(temp[2]<<16)|(temp[1]<<8)|temp[0];
	
	/*高度,像素为单位,4bytes*/
	read(bm_fd,temp,4);
	pBitmap->bmBMI.bmiHeader.biHeight=(temp[3]<<24)|(temp[2]<<16)|(temp[1]<<8)|temp[0];

	/*位面数,一般为1,2bytes*/
	read(bm_fd,temp,2);
	pBitmap->bmBMI.bmiHeader.biPlanes=(temp[1]<<8)|temp[0];

	/*每个像素位数,2bytes*/
	read(bm_fd,temp,2);
	pBitmap->bmBMI.bmiHeader.biBitCount=(temp[1]<<8)|temp[0];
	
	/*压缩说明,4bytes*/
	read(bm_fd,temp,4);
	pBitmap->bmBMI.bmiHeader.biCompression=(temp[3]<<24)|(temp[2]<<16)|(temp[1]<<8)|temp[0];
	
	/*用字节数表示的位图数据大小,4bytes*/
	read(bm_fd,temp,4);
	pBitmap->bmBMI.bmiHeader.biSizeImage=(temp[3]<<24)|(temp[2]<<16)|(temp[1]<<8)|temp[0];

	/*用像素每米表示的水平分辨率,4bytes*/
	read(bm_fd,temp,4);
	pBitmap->bmBMI.bmiHeader.biXPelsPerMeter=(temp[3]<<24)|(temp[2]<<16)|(temp[1]<<8)|temp[0];

	/*用像素每米表示的垂直分辨率,4bytes*/
	read(bm_fd,temp,4);
	pBitmap->bmBMI.bmiHeader.biXPelsPerMeter=(temp[3]<<24)|(temp[2]<<16)|(temp[1]<<8)|temp[0];

	/*位图使用的颜色数,如256色,4bytes*/
	read(bm_fd,temp,4);
	pBitmap->bmBMI.bmiHeader.biClrUsed=(temp[3]<<24)|(temp[2]<<16)|(temp[1]<<8)|temp[0];

	/*重要颜色,4bytes*/
	read(bm_fd,temp,4);
	pBitmap->bmBMI.bmiHeader.biClrImportant=(temp[3]<<24)|(temp[2]<<16)|(temp[1]<<8)|temp[0];

	switch(pBitmap->bmBMI.bmiHeader.biBitCount)
	{
	case 24:
		break;
	case 1:
	case 2:
	case 4:
	case 8:
	case 16:
		
	case 32: 
		printf("it's not a 24bit bmp,colors bit error!!\n");
		return -3;
	}
	
	close(bm_fd);
	return 0;
}
#define LoadBitmap LoadBitmapFromFile

/*卸载装入的图片*/
void UnLoadBitmap(BITMAP *pBitmap)
{
	//if(pBitmap->bmName)
	//	free(pBitmap->bmName);	
}

/*打印显示位图信息*/
void ShowBitmapInfo(BITMAP *pBitmap)
{
	//int i;
	DPRINTF("file %s information:\n",pBitmap->bmName);
	DPRINTF("bmBF.bfType=%s.\n",(char *)&(pBitmap->bmBF.bfType));
	DPRINTF("file size is %d bytes.\n",pBitmap->bmBF.bfSize);
	DPRINTF("fbmBF.bfReserved1=%d.\n",pBitmap->bmBF.bfReserved1);
	DPRINTF("fbmBF.bfReserved2=%d.\n",pBitmap->bmBF.bfReserved2);
	DPRINTF("fbmBF.bfOffBits=%d.\n",pBitmap->bmBF.bfOffBits);

	DPRINTF("bmBMI.bmiHeader.biSize=%d.\n",pBitmap->bmBMI.bmiHeader.biSize);
	DPRINTF("bmBMI.bmiHeader.biWidth=%d.\n",pBitmap->bmBMI.bmiHeader.biWidth);
	DPRINTF("bmBMI.bmiHeader.biHeight=%d.\n",pBitmap->bmBMI.bmiHeader.biHeight);
	DPRINTF("bmBMI.bmiHeader.biPlanes=%d.\n",pBitmap->bmBMI.bmiHeader.biPlanes);
	DPRINTF("bmBMI.bmiHeader.biBitCount=%d.\n",pBitmap->bmBMI.bmiHeader.biBitCount);
	DPRINTF("bmBMI.bmiHeader.biCompression=%d.\n",pBitmap->bmBMI.bmiHeader.biCompression);
	DPRINTF("bmBMI.bmiHeader.biSizeImage=%d.\n",pBitmap->bmBMI.bmiHeader.biSizeImage);
	DPRINTF("bmBMI.bmiHeader.biXPelsPerMeter=%d.\n",pBitmap->bmBMI.bmiHeader.biXPelsPerMeter);
	DPRINTF("bmBMI.bmiHeader.biYPelsPerMeter=%d.\n",pBitmap->bmBMI.bmiHeader.biYPelsPerMeter);
	DPRINTF("bmBMI.bmiHeader.biClrUsed=%d.\n",pBitmap->bmBMI.bmiHeader.biClrUsed);
	DPRINTF("bmBMI.bmiHeader.biClrImportant=%d.\n",pBitmap->bmBMI.bmiHeader.biClrImportant);
	
}

/*在(fbx,fby)处显示图片(整内存)*/
int ShowBitmapOnLCD(int fbx,int fby,PFBDEV pFbdev,BITMAP *pBitmap)
{
	int i,k,x,y,line_len;
	unsigned int w,h;
	FILE *bm_fp;
	unsigned int high,low,data_len;
	short int color;
	unsigned char r,g,b;
	unsigned char *pdata_buf,*pb;
	
	line_len=pFbdev->fb_fix.line_length;
	bm_fp=fopen(pBitmap->bmName,"r");
	if(bm_fp==NULL)
	{
		printf("can't open file %s!\n",pBitmap->bmName);
		return -1;
	}
	
	data_len=pBitmap->bmBMI.bmiHeader.biSizeImage;
	pdata_buf=(char *)malloc(data_len);
	if(pdata_buf==NULL)
	{
		printf("mem error!\n");
		return -2;
	}
	
	fseek(bm_fp,pBitmap->bmBF.bfOffBits,SEEK_SET);
	i=fread(pdata_buf,1,data_len,bm_fp);
	DPRINTF("fread=%d\n",i);

	fclose(bm_fp);
	
	w=pBitmap->bmBMI.bmiHeader.biWidth;
	h=pBitmap->bmBMI.bmiHeader.biHeight;
	DPRINTF("w=%d,h=%d\n",w,h);

	/*由于行扫描时要DWORD对齐,所以要转换w*3的值
	公式为:((width*biBitCount+31)>>5)<<2*/
	w=((w*24+31)>>5)<<2; 

	DPRINTF("fix_w=%d\n",w);
	pb=(char *)malloc(640*480*2);
	if(w!=640||h!=480)
	{
		DPRINTF("mem fb\n");
		memcpy(pb,(void *)(pFbdev->fb_mem+pFbdev->fb_mem_offset),640*480*2);
	}
	k=0;
	for(y=0;y<pBitmap->bmBMI.bmiHeader.biHeight;y++)
	{
		for(x=0;x<pBitmap->bmBMI.bmiHeader.biWidth;x++)
		{
			/*读出的数据左下角为实际图片的(0,0)像素点,通过以下公式可以
			*用i来找到(x,y)所对应的数据
			*/
			i=h*w-(w-x*3)-y*w;
			r=(pdata_buf[i+2]&0xF8);
			g=(pdata_buf[i+1]&0xFC);
			b=(pdata_buf[i]&0xF8);
			high=r|(g>>5);
			low=(g<<3)|(b>>3);
			color=(high<<8)|low;
			if((fbx+x<640)&&(fby+y<480))
			{
			  if(USE_TMS==0||color!=TMS)
			  {
				pb[line_len*(fby+y)+(fbx+x)*2]=low;
				pb[line_len*(fby+y)+(fbx+x)*2+1]=high;
			  }
			}
		}
	}
	
	
	memcpy((void *)(pFbdev->fb_mem+pFbdev->fb_mem_offset),pb,640*480*2);
	
	free(pdata_buf);
	free(pb);
	return 0;
}
/*在(fbx,fby)处显示图片(逐像素)*/
/* int ShowBitmapOnLCD(int fbx,int fby,PFBDEV pFbdev,BITMAP *pBitmap)
{
	int i,x,y,line_len;
	unsigned int w,h;
	FILE *bm_fp;
	unsigned int high,low,data_len;
	short int color;
	unsigned char r,g,b;
	unsigned char *pdata_buf;
	
	line_len=pFbdev->fb_fix.line_length;
	bm_fp=fopen(pBitmap->bmName,"r");
	if(bm_fp==NULL)
	{
		printf("can't open file %s!\n",pBitmap->bmName);
		return -1;
	}
	
	data_len=pBitmap->bmBMI.bmiHeader.biSizeImage;
	pdata_buf=(unsigned char *)malloc(data_len);
	if(pdata_buf==NULL)
	{
		printf("mem error!\n");
		return -2;
	}
	
	fseek(bm_fp,pBitmap->bmBF.bfOffBits,SEEK_SET);
	i=fread(pdata_buf,1,data_len,bm_fp);
	DPRINTF("fread=%d\n",i);

	fclose(bm_fp);
	
	w=pBitmap->bmBMI.bmiHeader.biWidth;
	h=pBitmap->bmBMI.bmiHeader.biHeight;
	DPRINTF("w=%d,h=%d\n",w,h);

	//由于行扫描时要DWORD对齐,所以要转换w*3的值
	//公式为:((width*biBitCount+31)>>5)<<2
	w=((w*24+31)>>5)<<2; 

	DPRINTF("fix_w=%d\n",w);
	for(y=0;y<pBitmap->bmBMI.bmiHeader.biHeight;y++)
	{
		for(x=0;x<pBitmap->bmBMI.bmiHeader.biWidth;x++)
		{
			//读出的数据左下角为实际图片的(0,0)像素点,通过以下公式可以
			//用i来找到(x,y)所对应的数据
			
			i=h*w-(w-x*3)-y*w;
			r=(pdata_buf[i+2]&0xF8);
			g=(pdata_buf[i+1]&0xFC);
			b=(pdata_buf[i]&0xF8);
			high=r|(g>>5);
			low=(g<<3)|(b>>3);
			color=(high<<8)|low;
			if(y==0&&x==0)
			DPRINTF("color=0x%x\n",color);
			if((fbx+x<640)&&(fby+y<480))
			{
			  if(USE_TMS==0||color!=TMS)
			  {
				fb_memset((void *)(pFbdev->fb_mem+pFbdev->fb_mem_offset
					+line_len*(fby+y)+(fbx+x)*2),low,1);
				fb_memset((void *)(pFbdev->fb_mem+pFbdev->fb_mem_offset
					+line_len*(fby+y)+(fbx+x)*2+1),high,1);
			  }
			}
		}
	}
	free(pdata_buf);

	return 0;
}*/

/*fbx,fby图片坐上角在屏幕上位置
**fbx:0-639
**fby:0-479
*/
int ShowBitmap(int fbx,int fby,char *file_name)
{
	FBDEV fbdev;
	
	BITMAP mybmp;
	LoadBitmap(&mybmp,file_name); 
	//ShowBitmapInfo(&mybmp);
	
	memset(&fbdev, 0, sizeof(FBDEV));
	strcpy(fbdev.dev, FB_DEVICE );
	if(fb_open(&fbdev)==FALSE)
	{
		printf("open frame buffer error\n");
		return -1;
	}
	DPRINTF("fbdev.fb_var.bits_per_pixel=%d\n",fbdev.fb_var.bits_per_pixel);
	DPRINTF("fbdev.fb_fix.smem_len=%d\n",fbdev.fb_fix.smem_len);
	DPRINTF("fbdev.fb_fix.line_length=%d\n",fbdev.fb_fix.line_length);

	ShowBitmapOnLCD(fbx,fby,&fbdev,&mybmp);

	fb_close(&fbdev);
	
	UnLoadBitmap(&mybmp);
	DPRINTF("bitmap unloaded.\n");
	return 0;
}  

/*清屏,color为颜色值0-255*/
void ClearScreen(int color)
{
	FBDEV fbdev;
	
	
	memset(&fbdev, 0, sizeof(FBDEV));
	strcpy(fbdev.dev, FB_DEVICE );
	if(fb_open(&fbdev)==FALSE)
	{
		printf("open frame buffer error\n");
		return;
	}
	
	fb_memset((void *)(fbdev.fb_mem + fbdev.fb_mem_offset),color,fbdev.fb_fix.smem_len);

	fb_close(&fbdev);
}  

/*得到fbx,fby处点的颜色*/
short int DrawColor(int fbx,int fby)
{
	short int dc;
	FBDEV fbdev;

	memset(&fbdev, 0, sizeof(FBDEV));
	strcpy(fbdev.dev, FB_DEVICE );
	if(fb_open(&fbdev)==FALSE)
	{
		printf("open frame buffer error\n");
		return -1;
	}
	
	memcpy((char *)&dc,(void *)(fbdev.fb_mem+fbdev.fb_mem_offset+fbx*2
		+fbdev.fb_fix.line_length*fby),2);

	fb_close(&fbdev);
	
	return dc;
}

/*在背景bgbmp上清除在(fbx,fby)处的图片file_name*/
void ClearBitmap(int fbx,int fby,char *bgbmp,char *file_name)
{
	BITMAP mybmp1,mybmp2;
	FBDEV fbdev;
	int i,x,y,w1,w2,h1,h2,line_len;
	unsigned int high,low;
	unsigned char r,g,b;
	FILE *bm_fp1,*bm_fp2;
	
	memset(&fbdev, 0, sizeof(FBDEV));
	strcpy(fbdev.dev, FB_DEVICE );
	if(fb_open(&fbdev)==FALSE)
	{
		printf("open frame buffer error\n");
		return;
	}

	LoadBitmap(&mybmp1,bgbmp); 
	LoadBitmap(&mybmp2,file_name);
	bm_fp1=fopen(mybmp1.bmName,"r");
	if(bm_fp1==NULL)
	{
		printf("can't open file %s!\n",mybmp1.bmName);
		return;
	}
	bm_fp2=fopen(mybmp2.bmName,"r");
	if(bm_fp2==NULL)
	{
		printf("can't open file %s!\n",mybmp2.bmName);
		return;
	}

	w1=mybmp1.bmBMI.bmiHeader.biWidth;
	h1=mybmp1.bmBMI.bmiHeader.biHeight;
	w2=mybmp2.bmBMI.bmiHeader.biWidth;
	h2=mybmp2.bmBMI.bmiHeader.biHeight;
	/*由于行扫描时要DWORD对齐,所以要转换w*3的值
	公式为:((width*biBitCount+31)>>5)<<2*/
	w2=((w2*24+31)>>5)<<2; 
	line_len=fbdev.fb_fix.line_length;
	for(y=0;y<h1;y++)
	{
		for(x=0;x<w1;x++)
		{
			i=h2*w2-(w2-3*(x+fbx))-(y+fby)*w2;
			fseek(bm_fp2,mybmp2.bmBF.bfOffBits+i,SEEK_SET);
			fread(&b,1,1,bm_fp2);
			fread(&g,1,1,bm_fp2);
			fread(&r,1,1,bm_fp2);
			r=(r&0xF8);
			g=(g&0xFC);
			b=(b&0xF8);
			high=r|(g>>5);
			low=(g<<3)|(b>>3);
			fb_memset((void *)(fbdev.fb_mem+fbdev.fb_mem_offset
				+line_len*(fby+y)+(fbx+x)*2),low,1);
			fb_memset((void *)(fbdev.fb_mem+fbdev.fb_mem_offset
				+line_len*(fby+y)+(fbx+x)*2+1),high,1);
		}
	}	
	
	fb_close(&fbdev);
	UnLoadBitmap(&mybmp1);
	UnLoadBitmap(&mybmp2);
}

/*以触摸屏返回的坐标值(touch_x,touch_y)经转换使位图显示在LCD上*/
int ShowBitmapWithTS(int touch_x,int touch_y,char *filename)
{
	int ret;
	double xmin,xmax,ymin,ymax,xpp,ypp;
	/*x[4],y[4]需根据不通触摸屏进行修改*/
	int x[4]={230,260,3550,3500},y[4]={450,460,3800,3700};
	xmin=(x[0]+x[1])/2;
	xmax=(x[2]+x[3])/2;
	ymin=(y[0]+y[1])/2;
	ymax=(y[2]+y[3])/2;
	xpp=(xmax-xmin)/640;
	ypp=(ymax-ymin)/480;
	DPRINTF("touch:x=%d,y=%d\n",touch_x,touch_y);
	touch_x=(int)((touch_x-xmin)/xpp-25);
	touch_y=(int)((ymax-touch_y)/ypp-25);
	DPRINTF("calibration:x=%d,y=%d\n",touch_x,touch_y);
	ret=ShowBitmap(touch_x,touch_y,filename);
	return ret;	
}