使用intel ijl库 RGB转Jpg

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BOOL CRawXXX:: EncodeJpegUseIJL(char *dstfile,int *len,int width, int height, char*srcdata, int imageChannels, int quality)

{

BOOL res = FALSE;

JPEG_CORE_PROPERTIES image;

IJLERR err;

ZeroMemory( &image,sizeof( JPEG_CORE_PROPERTIES ) );

IJLIOTYPE iotype;

try

{

if( ijlInit( &image ) != IJL_OK )

{

OutputDebugString("Can't initialize Intel(R) JPEG library" );

return FALSE;

}

image.DIBWidth =width;

image.DIBHeight =height;

image.DIBBytes = (unsignedchar*)srcdata;

if (!len || *len == 0)

{

image.JPGFile =dstfile;

iotype = IJL_JFILE_WRITEWHOLEIMAGE;

}

else

{

image.JPGBytes = (unsignedchar*)dstfile;

image.JPGSizeBytes = *len;

iotype = IJL_JBUFF_WRITEWHOLEIMAGE;

}

image.JPGWidth =width;

image.JPGHeight =abs(height);

image.jquality =quality;

switch(imageChannels)

{

case 1:

image.DIBColor =IJL_G;

image.DIBChannels = 1;

image.DIBPadBytes =IJL_DIB_PAD_BYTES(image.DIBWidth,1);

image.JPGColor =IJL_G;

image.JPGChannels = 1;

image.JPGSubsampling =IJL_NONE;

break;

case 3:

image.DIBColor =IJL_BGR;

image.DIBChannels = 3;

image.DIBPadBytes =IJL_DIB_PAD_BYTES(image.DIBWidth,3);

image.JPGColor =IJL_YCBCR;

image.JPGChannels = 3;

image.JPGSubsampling =IJL_411;

break;

case 4:

image.DIBColor =IJL_RGBA_FPX;

image.DIBChannels = 4;

image.DIBPadBytes =IJL_DIB_PAD_BYTES(image.DIBWidth,4);

image.JPGColor =IJL_YCBCRA_FPX;

image.JPGChannels = 4;

image.JPGSubsampling =IJL_4114;

break;

default:

break;

}

if( (err =ijlWrite( &image,iotype )) != IJL_OK )

{

OutputDebugString("Can't write image(%d)");

}

if (len)

*len = image.JPGSizeBytes;

if( ijlFree( &image ) != IJL_OK )

{

OutputDebugString("Can't free Intel(R) JPEG library" );

}

res = TRUE;

}

catch (...)

{

OutputDebugString( "EncodeJpegUseIJL unknown error" );

}

return res;

}

参数说明：

参数分别是：[输出参数]压缩后的缓冲区、大小，[输入]bmp宽、高，bmp缓冲区，图像位（一般写 3），压缩质量1-99。

调用方式：

char *bjpgData=newchar[pRgb888.width*pRgb888.height*3];

int lSize=1628*1236*3;

if(EncodeJpegUseIJL((char*)bjpgData,&lSize,pRgb888.width,pRgb888.height*(-1),(char*)pRgb888.buffer,3,80))

{

//压缩成功了

TRACE("rgb to jpg success\n");

}

//保存图像

SYSTEMTIME t;

GetLocalTime(&t);

char filename[128];

sprintf(filename,"%04d-%02d-%02d-%02d-%02d-%02d-%03d.jpg",

t.wYear,t.wMonth, t.wDay,

t.wHour,t.wMinute, t.wSecond, t.wMilliseconds);

FILE *fp =fopen(filename,"wb");

fwrite(bjpgData,lSize, 1, fp);

fclose(fp);

封装后的函数如下：

//ijl bmp to jpg 其中ijlInit等函数的定义

int CImgXXX:rgb24_to_jpeg_ijl(unsignedchar *data,intimage_width, intimage_height, char *filename,int quality )

{

JPEG_CORE_PROPERTIES jcprops;

IJLERR jerr;

jerr = ijlInit(&jcprops);

if(IJL_OK !=jerr)

{

/*MessageBox(ijlErrorStr(jerr),"ijlInit function called failed!",MB_OK);*/

ijlFree(&jcprops);

return -1;

}

long LineSize = (image_width *3+3)/4*4;

//initialize the compression parameters describing the kind of Bitmap we are encoding from

jcprops.DIBChannels = 3;

jcprops.DIBColor =IJL_BGR;//Color space of uncompressed data.

jcprops.DIBHeight =image_height;

jcprops.DIBWidth =image_width;

jcprops.DIBPadBytes =IJL_DIB_PAD_BYTES(jcprops.DIBWidth,jcprops.JPGChannels);

jcprops.JPGWidth =image_width;

jcprops.JPGHeight =image_height;

jcprops.JPGFile =filename;

int w,h;

w = image_width;

h = image_height;

BYTE * JPEGimgdata = new BYTE[image_width*image_height*3];

for(inti=0;i<h;i++)

{

memcpy(JPEGimgdata+i*LineSize,data+(h-i-1)*LineSize,LineSize);

}

jcprops.DIBBytes =JPEGimgdata;

//write the entire JPEG image. this create a JFIF file.

jerr = ijlWrite(&jcprops,IJL_JFILE_WRITEWHOLEIMAGE);

if(IJL_OK !=jerr)

{

//MessageBox(ijlErrorStr(jerr),"ijlWrite function called failed!",MB_OK);

//release the IJL

ijlFree(&jcprops);

//release file

delete[] JPEGimgdata;

JPEGimgdata = NULL;

return -1;

}

//release the IJL

ijlFree(&jcprops);

delete[] JPEGimgdata;

JPEGimgdata = NULL;

return 0;

}

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