BMP图片解码代码,C代码库,德仔网

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【C】 BMP图片解码
作者:taozhihua1314 / 发布于2014/7/8/ 365

	//*****************************************************************************//
	//* 数码相框
	//*控制芯片：ATmgea128
	//*开发环境：AVR Studio+GCC
	//*隶属模块：位图解码
	//*设计者： 桃子
	//*****************************************************************************//
	#include "bmp.h"

	extern unsigned char buffer[512]; //文件系统数据缓冲
	extern FATFS fs; //文件系统结构
	extern FIL fl; //文件状态信息
	extern FRESULT res; //文件返回值
	extern unsigned int r; //文件读取数量
	//****************************************************************
	//*隶属模块：BMP解码
	//*函数功能：小端转大端
	//****************************************************************
	UINT32 bmp_LE2BE(UINT8 *dat,UINT8 len)
	{
	 UINT32 temp=0;

	 if(len >= 1) temp = (UINT32)dat[0];
	 if(len >= 2) temp |= (UINT32)dat[1]<<8;
	 if(len >= 3) temp |= (UINT32)dat[2]<<16;
	 if(len >= 4) temp |= (UINT32)dat[3]<<24;

	 return temp;
	}
	//****************************************************************
	//*隶属模块：BMP解码
	//*函数功能：单灰BMP解码显示
	//*注意：图片宽度最好小于208
	//****************************************************************
	void BMP_1(unsigned int x0,unsigned int y0,unsigned char type)
	{
	 unsigned int j;
	 unsigned char k=0;

	 if(BMP.bmp_width & 0x001f)BMP.bmp_width +=32 - (BMP.bmp_width & 0x001f);

	 if(type)
	 TFT_Windons(x0,x0+BMP.bmp_width-1,y0,y0+BMP.bmp_hight-1);
	 else
	 {
	 x0 = (240 - BMP.bmp_width)/2;
	 y0 = (320 - BMP.bmp_hight)/2;
	 TFT_Windons(x0,x0+BMP.bmp_width-1,y0,y0+BMP.bmp_hight-1);
	 }

	 while(1)
	 {
	 res = f_read(&fl,buffer,512,&r);
	 if(res || r==0) break;
	 for(j=0;j<r;j++)
	 {
	 for(k=8;k;k--)
	 {
	 if(buffer[j] & (1 << (k-1)))
	 TFT_Write_Data(0x00,0x00);
	 else
	 TFT_Write_Data(0xff,0xff);
	 }
	 }
	 }
	}
	//****************************************************************
	//*隶属模块：BMP解码
	//*函数功能：16位灰BMP解码显示
	//*注意：图片宽度最好小于232
	//****************************************************************
	void BMP_4(unsigned int x0,unsigned int y0,unsigned char type)
	{
	 unsigned int j;
	 unsigned char color_H,color_L,i;
	 const unsigned char table_RBGcolor[16] = {0xff,0xee,0xdd,0xcc,0xbb,0xaa,//经查表RGB三像素相同
	 0x99,0x88,0x77,0x66,0x55,0x44,//从白到黑FF~00共16个
	 0x33,0x22,0x11,0x00}; //段

	 if(BMP.bmp_width & 0x0007)BMP.bmp_width +=8 - (BMP.bmp_width & 0x007);

	 if(type)
	 TFT_Windons(x0,x0+BMP.bmp_width-1,y0,y0+BMP.bmp_hight-1);
	 else
	 {
	 x0 = (240 - BMP.bmp_width)/2;
	 y0 = (320 - BMP.bmp_hight)/2;
	 TFT_Windons(x0,x0+BMP.bmp_width-1,y0,y0+BMP.bmp_hight-1);
	 }

	 while(1)
	 {
	 res = f_read(&fl,buffer,512,&r);
	 if(res || r==0) break;

	 for(j=0;j<r;j++)
	 {
	 i = buffer[j]>> 4;
	 color_H = (table_RBGcolor[i] & 0xf8) | (table_RBGcolor[i] >> 5);
	 color_L = ((table_RBGcolor[i] << 3) & 0xe0) | (table_RBGcolor[i] >> 3);
	 TFT_Write_Data(color_H,color_L);
	
	 i = buffer[j]& 0x0f;
	 color_H = (table_RBGcolor[i] & 0xf8) | (table_RBGcolor[i] >> 5);
	 color_L = ((table_RBGcolor[i] << 3) & 0xe0) | (table_RBGcolor[i] >> 3);
	 TFT_Write_Data(color_H,color_L);
	 }
	 }
	}
	//****************************************************************
	//*隶属模块：BMP解码
	//*函数功能：256位灰BMP解码显示
	//*注意：图片宽度最好小于236
	//****************************************************************
	void BMP_8(unsigned int x0,unsigned int y0,unsigned char type)
	{
	 const unsigned char table_Bcolor[4] = {0x00,0x55,0xaa,0xff};//经查表R像素
	 const unsigned char table_GRcolor[8] = {0x00,0x24,0x48,0x6d,0x91,0xb6,0xda,0xff};//经查表GB像素相同

	 unsigned int j;
	 unsigned char color_H,color_L;

	
	 if(BMP.bmp_width & 0x0003)BMP.bmp_width +=4 - (BMP.bmp_width & 0x03);

	 if(type)
	 TFT_Windons(x0,x0+BMP.bmp_width-1,y0,y0+BMP.bmp_hight-1);
	 else
	 {
	 x0 = (240 - BMP.bmp_width)/2;
	 y0 = (320 - BMP.bmp_hight)/2;
	 TFT_Windons(x0,x0+BMP.bmp_width-1,y0,y0+BMP.bmp_hight-1);
	 }

	 while(1)
	 {
	 res = f_read(&fl,buffer,512,&r);
	 if(res || r==0) break;
	 for(j=0;j<r;j++)
	 {
	 color_H = (table_Bcolor[buffer[j]>>6] & 0xf8) | (table_GRcolor[(buffer[j] & 0x38)>>3] >> 5);
	 color_L = ((table_GRcolor[(buffer[j] & 0x38)>>3] << 3) & 0xe0) | (table_GRcolor[buffer[j] & 0x07] >> 3);
	 TFT_Write_Data(color_H,color_L);
	 }
	 }
	}

	//****************************************************************
	//*隶属模块：BMP解码
	//*函数功能：16位真彩BMP解码显示
	//****************************************************************
	void BMP_16(unsigned int x0,unsigned int y0,unsigned char type)
	{
	 unsigned int j=0;
	 unsigned int temp_color=0;
	 if(BMP.bmp_width & 0x0001)BMP.bmp_width +=1;

	 if(type)
	 TFT_Windons(x0,x0+BMP.bmp_width-1,y0,y0+BMP.bmp_hight-1);
	 else
	 {
	 x0 = (240 - BMP.bmp_width)/2;
	 y0 = (320 - BMP.bmp_hight)/2;
	 TFT_Windons(x0,x0+BMP.bmp_width-1,y0,y0+BMP.bmp_hight-1);
	 }
	 while(1)
	 {
	 res = f_read(&fl,buffer,512,&r);
	 if(res || r==0) break;
	 for(j=0;j<r;j+=2)
	 {
	 temp_color = ((buffer[j]&0xE0)<<1)|(buffer[j]&0x1F);
	 TFT_Write_Data((buffer[j+1]<<1)|(temp_color>>8),temp_color&0x00FF);
	
	 }
	 }
	}
	//****************************************************************
	//*隶属模块：BMP解码
	//*函数功能：24位真彩BMP解码显示
	//****************************************************************
	void BMP_24(unsigned int x0,unsigned int y0,unsigned char type)
	{
	 unsigned int j=0;
	 unsigned char temp[2];

	 if(BMP.bmp_width & 0x0003)BMP.bmp_width +=4 - (BMP.bmp_width & 0x03);

	 if(type)
	 TFT_Windons(x0,x0+BMP.bmp_width-1,y0,y0+BMP.bmp_hight-1);
	 else
	 {
	 x0 = (240 - BMP.bmp_width)/2;
	 y0 = (320 - BMP.bmp_hight)/2;
	 TFT_Windons(x0,x0+BMP.bmp_width-1,y0,y0+BMP.bmp_hight-1);
	 }

	 while(1)
	 {
	 res = f_read(&fl,buffer,512,&r);
	 if(res || r==0) break;
	 temp[0] = buffer[510];temp[1] = buffer[511];
	 for(j=0;j<r-2;j+=3)
	 {
	 TFT_Write_Data((buffer[j+2]&0xf8)|(buffer[j+1]>>5),
	 ((buffer[j+1]<<3)&0xe0)|(buffer[j]>>3));
	 }

	
	 res = f_read(&fl,buffer,512,&r);
	 if(res || r==0) break;

	 TFT_Write_Data((buffer[0]&0xf8)|(temp[1]>>5),
	 ((temp[1]<<3)&0xe0)|(temp[0]>>3));
	
	 temp[0] = buffer[511];
	 for(j=1;j<r-1;j+=3)
	 {
	 TFT_Write_Data((buffer[j+2]&0xf8)|(buffer[j+1]>>5),
	 ((buffer[j+1]<<3)&0xe0)|(buffer[j]>>3));
	 }

	
	 res = f_read(&fl,buffer,512,&r);
	 if(res || r==0) break;

	 TFT_Write_Data((buffer[1]&0xf8)|(buffer[0]>>5),
	 ((buffer[0]<<3)&0xe0)|(temp[0]>>3));
	 for(j=2;j<r;j+=3)
	 {
	 TFT_Write_Data((buffer[j+2]&0xf8)|(buffer[j+1]>>5),
	 ((buffer[j+1]<<3)&0xe0)|(buffer[j]>>3));
	 }

	 }
	}
	//****************************************************************
	//*隶属模块：BMP解码
	//*函数功能：32位真彩BMP解码显示
	//****************************************************************
	void BMP_32(unsigned int x0,unsigned int y0,unsigned char type)
	{
	 unsigned int j=0;

	 if(type)
	 TFT_Windons(x0,x0+BMP.bmp_width-1,y0,y0+BMP.bmp_hight-1);
	 else
	 {
	 x0 = (240 - BMP.bmp_width)/2;
	 y0 = (320 - BMP.bmp_hight)/2;
	 TFT_Windons(x0,x0+BMP.bmp_width-1,y0,y0+BMP.bmp_hight-1);
	 }
	 while(1)
	 {
	 res = f_read(&fl,buffer,512,&r);
	 if(res || r==0) break;
	 for(j=0;j<r;j+=4)
	 {
	 TFT_Write_Data((buffer[j+2]&0xf8)|(buffer[j+1]>>5),
	 ((buffer[j+1]<<3)&0xe0)|(buffer[j]>>3));
	 }
	 }
	}
	//****************************************************************
	//*隶属模块：BMP解码
	//*函数功能：BMP图片格式解码
	//****************************************************************
	void dis_bmp(unsigned int x0,unsigned int y0,unsigned char type)
	{
	 do
	 {
	 res = f_read(&fl,buffer,512,&r);//读512个数据
	 }while(res || r==0);
	 BMP.bmp_offset = bmp_LE2BE((buffer + 10),4);//数据偏移量
	 BMP.bmp_width = (UINT16)(bmp_LE2BE((buffer + 18),4));//图像宽度
	 BMP.bmp_hight = (UINT16)(bmp_LE2BE((buffer + 22),4));//说明图像高度
	 BMP.bmp_form = (UINT16)(bmp_LE2BE((buffer + 28),2));//说明图像格式
	 do{
	 res = f_lseek(&fl,BMP.bmp_offset);
	 }while(res);
	 if(type == 2)
	 {BMP.bmp_width >>= 1;BMP.bmp_hight >>= 1;}
	 else if(type == 4)
	 {BMP.bmp_width >>= 2;BMP.bmp_hight >>= 2;}
	 switch(BMP.bmp_form)
	 {
	 case 1: BMP_1(x0,y0,type); break;
	 case 4: BMP_4(x0,y0,type); break;
	 case 8: BMP_8(x0,y0,type); break;
	 case 16:BMP_16(x0,y0,type);break;
	 case 24:BMP_24(x0,y0,type);break;
	 case 32:BMP_32(x0,y0,type);break;
	 default:break;
	 }
	 f_close(&fl);
	 f_mount(0,NULL);
	}
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