bool copyImgDataToCImage(CImage &srcImage,CImage &dstImage,int margin)
{
margin = abs(margin);
//读取图像宽高
int width = srcImage.GetWidth();
int height = srcImage.GetHeight();
if(margin*2 > width)
{
return false;
}
//new width
int imgWidth = width-2*margin;
if(!dstImage.CreateEx(imgWidth,height, 24, BI_RGB))//创建CImage 对象
{
return false;
}
//设置像素
for(int i = height - 1;i >= 0 ; i--)
{
for(int j = 0; j < imgWidth;j++)
{
BYTE *pDst = (BYTE*)dstImage.GetPixelAddress(j, i);
BYTE *pSrc = (BYTE*)srcImage.GetPixelAddress(j + margin, i);
//读取并设置 rgb值
*pDst++ = *pSrc++; // b分量值
*pDst++ = *pSrc++; //g 分量
*pDst = *pSrc; // r分量
}
//new offset
}
return true;
}
//decodeJpeg to gray image
bool decodeToGrayCImage(FIMEMORY *hMem,CImage &image)
{
FreeImage_SeekMemory(hMem,0,SEEK_SET);
FIBITMAP *check = FreeImage_LoadFromMemory(FIF_JPEG, hMem, 0);
unsigned int width = FreeImage_GetWidth(check);
unsigned int height = FreeImage_GetHeight(check);
unsigned int pitch = FreeImage_GetPitch(check);
FREE_IMAGE_TYPE image_type = FreeImage_GetImageType(check);
if(!image.CreateEx(width,height,24,BI_RGB))
{
FreeImage_Unload(check);
return false;
}
int x,y;
if((image_type == FIT_BITMAP) && (FreeImage_GetBPP(check) == 24))
{
//像素操作
BYTE *bits = (BYTE*)FreeImage_GetBits(check);
for(y = 0; y < (int)height; y++)
{
BYTE *pixel = (BYTE*)bits;
for(x = 0; x < (int)width; x++)
{
BYTE *p = (BYTE*)image.GetPixelAddress(x, height -1 - y);
int grayVal = (int)(0.30 * pixel[FI_RGBA_RED] + 0.59 * pixel[FI_RGBA_GREEN] + 0.11*pixel[FI_RGBA_BLUE]);
*p++ = (BYTE)grayVal;
*p++ = (BYTE)grayVal;
*p++ = (BYTE)grayVal;
pixel += 3;
}
// next line
bits += pitch;
}
}
else
{
FreeImage_Unload(check);
return false;
}
FreeImage_Unload(check);
return true;
}
bool scaleImage(CImage& srcImg,CImage& dstImg,int dstWidth,int dstHeight)
{
int nHeight = srcImg.GetHeight();
int nWidth = srcImg.GetWidth();
if(dstImg.CreateEx(dstWidth,dstHeight, 24, BI_RGB))
{
HDC ImgDC = dstImg.GetDC();
int nPreMode = ::SetStretchBltMode(ImgDC, HALFTONE);
srcImg.Draw(ImgDC, 0, 0, dstWidth,dstHeight, 0, 0, nWidth, nHeight);
::SetBrushOrgEx(ImgDC, 0, 0, NULL);
::SetStretchBltMode(ImgDC, nPreMode);
dstImg.ReleaseDC();
}
else
{
return false;
}
return true;
}
//尺度变换
bool Scaling(CImage& srcImg,CImage& dstImg,double ratio)
{
int nHeight = srcImg.GetHeight();
int nWidth = srcImg.GetWidth();
if(dstImg.CreateEx((int)(nWidth*ratio),(int)(nHeight*ratio), 24, BI_RGB))
{
HDC ImgDC = dstImg.GetDC();
int nPreMode = ::SetStretchBltMode(ImgDC, HALFTONE);
srcImg.Draw(ImgDC, 0, 0, (int)(nWidth*ratio),(int)(nHeight*ratio), 0, 0, nWidth, nHeight);
::SetBrushOrgEx(ImgDC, 0, 0, NULL);
::SetStretchBltMode(ImgDC, nPreMode);
dstImg.ReleaseDC();
}
else
{
return false;
}
return true;
}
