player/Project/Src/JPEG/picdeco.c

#include "main.h"
#include "picdeco.h"


FIL  File_JPEG; 
JDEC JPEG_Dev;   		  
FIL  *f_jpeg   = &File_JPEG;		
JDEC *jpeg_dev = &JPEG_Dev;   				
 __attribute__((aligned(4))) u8 jpg_buffer[JPEG_BufferSize];	
	
static u16 JPEG_X = 0;	//图片显示的起始坐标
static u16 JPEG_Y = 0;	//图片显示的起始坐标

			
//从文件系统里读取数据
static UINT In_Func (JDEC* jdec,BYTE* buff,UINT ndata)
{ 
	UINT  rb; 
	FIL *dev=(FIL*)jdec->device;  
	if(buff)     				
	{ 
	  f_read(dev,buff,ndata,&rb);
	  return rb;        	
	}
	else return (f_lseek(dev,f_tell(dev)+ndata)==FR_OK)?ndata:0;
}  

 
//#define COLOR565TO888(color) (((color&0xf800)<<8)|(color&0x07e0)<<5|((color&0x001f)<<3))


//直接把图像输出到屏幕
static UINT Out_Func (JDEC* jdec,void* bitmap,JRECT* rect)
{
	u16 m,n;	
	u16 x = rect->left,y = 0;	//实际要显示的X、Y坐标
	u16 *PointColor = bitmap;	//像素点的颜色
	u16 JPEG_Width  = rect->right-rect->left+1;		
	u16 JPEG_Height = rect->bottom-rect->top+1;	
	
   for(m=0;m<JPEG_Height;m++)	
	{										 
		y=(8193*(rect->top+m))>>13; //实际显示的y坐标		
		for(n=0;n<JPEG_Width;n++)
		{
		   x=(8193*(rect->left+n))>>13; //实际显示的x坐标		
			//extern u32* LCD_ADDR;
			if (x<480&y<272)
			{
				int point=(480*272-1)-((y+JPEG_Y)*480+(JPEG_X+x));
				//if ((point>=0)&&(point<480*272))
					//LCD_ADDR[point]=COLOR565TO888((*PointColor));
			}
			PointColor++;
		}
	}
   return 0;   //成功返回0
}

//解码并把图像输出到屏幕
u8 JPEG_Show(const u8 *filename,u16 x,u16 y)
{	
	u8 JPEG_Res;   // 文件操作结果 
	
	JPEG_X = x;
	JPEG_Y = y;
	 
	JPEG_Res = f_open(f_jpeg,(const TCHAR*)filename,FA_READ);//打开文件
	if( JPEG_Res == FR_OK ) //读取JPEG文件成功
	{ 
		JPEG_Res = jd_prepare(jpeg_dev,In_Func,jpg_buffer,JPEG_BufferSize,f_jpeg);	//准备解码
		if( JPEG_Res == JDR_OK ) //操作成功成功 
		{ 					
			JPEG_Res=jd_decomp(jpeg_dev,Out_Func,0); //进行JPEG的解码并显示
		}
	} 
	f_close(f_jpeg); //关闭文件
	return JPEG_Res;
}






BITMAP_Struct *g_BITMAP_struct=0;


//图像缓存到内存
static UINT Out_Func2 (JDEC* jdec,void* bitmap,JRECT* rect)
{
	u16 m,n;	
	u16 x = rect->left,y = 0;	//实际要显示的X、Y坐标
	u16 *PointColor = bitmap;	//像素点的颜色
	u16 JPEG_Width  = rect->right-rect->left+1;		
	u16 JPEG_Height = rect->bottom-rect->top+1;	
	u16 *buff=g_BITMAP_struct->buff;
	int buff_size=g_BITMAP_struct->x_size*g_BITMAP_struct->y_size-1;
  for(m=0;m<JPEG_Height;m++)	
	{										 
		y=(8193*(rect->top+m))>>13; //实际显示的y坐标		
		for(n=0;n<JPEG_Width;n++)
		{
			int temp=0;
		  x=(8193*(rect->left+n))>>13; //实际显示的x坐标	
			//temp=buff_size-(y*g_BITMAP_struct->x_size+x);
			temp=(y*g_BITMAP_struct->x_size+x);
			buff[temp]=*PointColor;
			PointColor++;
		}
	}
   return 0;   //成功返回0
}







//解码并把图像存储在内存
u8 JPEG_Decode(const u8 *filename,BITMAP_Struct *bitmap)
{	
	u8 JPEG_Res;   // 文件操作结果 
	g_BITMAP_struct=bitmap;
	JPEG_Res = f_open(f_jpeg,(const TCHAR*)filename,FA_READ);//打开文件
	if( JPEG_Res == FR_OK ) //读取JPEG文件成功
	{ 
		JPEG_Res = jd_prepare(jpeg_dev,In_Func,jpg_buffer,JPEG_BufferSize,f_jpeg);	//准备解码
		if( JPEG_Res == JDR_OK ) //操作成功成功 
		{ 
			g_BITMAP_struct->x_size=jpeg_dev->width;
			g_BITMAP_struct->y_size=jpeg_dev->height;
			g_BITMAP_struct->buff=mymalloc_exm(jpeg_dev->width*jpeg_dev->height*2);
			if (g_BITMAP_struct->buff!=0)
			{
				JPEG_Res=jd_decomp(jpeg_dev,Out_Func2,0); //进行JPEG的解码并显示
			}
			else
			{
				JPEG_Res=(u8)-1;
			}
		}
	} 
	f_close(f_jpeg); //关闭文件
	return JPEG_Res;
}



struct data_struct
{
	u8 *data;
	u32 offset;
	u32 size;
};



//从内存中读取数据
static UINT In_Func_Ram (JDEC* jdec,BYTE* buff,UINT ndata)
{ 
	u32  rb; 
	struct data_struct *data=(struct data_struct *)jdec->device;  
	if (data->size>data->offset+ndata)
	{
		rb=ndata;
	}
	else
	{
		rb=data->size-(data->offset);
	}
	if(buff)     				
	{ 
		mymemcpy (buff,&data->data[data->offset],rb);
		data->offset+=rb;
	  return rb;        	
	}
	else 
	{
		return rb;
	}
}  


//解码存储在ram中的jpeg数据
u8 JPEG_Decode_Ram(u8 *data,u32 size,BITMAP_Struct *bitmap)
{	
	u8 JPEG_Res;   // 文件操作结果 
	g_BITMAP_struct=bitmap;
	if( data ) //读取JPEG文件成功
	{ 
		struct data_struct data_struct={0};
		data_struct.data=data;
		data_struct.size=size;
		JPEG_Res = jd_prepare(jpeg_dev,In_Func_Ram,jpg_buffer,JPEG_BufferSize,&data_struct);	//准备解码
		if( JPEG_Res == JDR_OK ) //操作成功成功 
		{ 
			g_BITMAP_struct->x_size=jpeg_dev->width;
			g_BITMAP_struct->y_size=jpeg_dev->height;
			g_BITMAP_struct->buff=mymalloc(jpeg_dev->width*jpeg_dev->height*2);
			if (g_BITMAP_struct->buff!=0)
			{
				JPEG_Res=jd_decomp(jpeg_dev,Out_Func2,0); //进行JPEG的解码并显示
			}
			else
			{
				JPEG_Res=(u8)-1;
			}
		}
	} 
	return JPEG_Res;
}