이미지 변환 모듈 (모바일용, GDI+)

- 이미지의 포맷 변환 및 퀄러티, 크기조정(비율) 모듈 

- Windows 환경, C++, GDI+, Component

STDMETHODIMP CMobileImage::Convert(BSTR Src, BSTR Output, BSTR ImgFormat, long Quality, long Width, long Height, VARIANT_BOOL* pSuccess)

{

*pSuccess = VARIANT_FALSE;

_bstr_t bstrSrc(Src);

_bstr_t bstrOutput(Output);

_bstr_t bstrImgFormat(ImgFormat);

ULONG_PTR gdiToken;

Gdiplus::GdiplusStartupInput gdiInput;

Gdiplus::GdiplusStartup(&gdiToken, &gdiInput, NULL);

try {

std::auto_ptr<Gdiplus::Image> pImage(Gdiplus::Image::FromFile((LPCWSTR)bstrSrc));

if (!pImage.get()) {

throw -1;

}

CLSID m_pngClsid;

if (GetEncoderClsid((LPCWSTR)ImgFormat, &m_pngClsid) == -1) {

throw -1;

}

else {

Gdiplus::EncoderParameters params;

params.Count = 1;

params.Parameter[0].Guid = Gdiplus::EncoderQuality;

params.Parameter[0].Type = Gdiplus::EncoderParameterValueTypeLong;

params.Parameter[0].NumberOfValues = 1;

long Value = Quality;

params.Parameter[0].Value = &Value;

if (Width > 0 && Height > 0) {

std::auto_ptr<Gdiplus::Bitmap> pResize(new Gdiplus::Bitmap(Width, Height, PixelFormat24bppRGB));

std::auto_ptr<Gdiplus::Graphics> pGrap(Gdiplus::Graphics::FromImage(pResize.get()));

pGrap->DrawImage(pImage.get(), 0, 0, Width, Height);

pResize->Save((LPCWSTR)bstrOutput, &m_pngClsid, &params);

}

else {

pImage->Save((LPCWSTR)bstrOutput, &m_pngClsid, &params);

}

}

*pSuccess = VARIANT_TRUE;

}

catch (...) { }

Gdiplus::GdiplusShutdown(gdiToken);

if (m_spObjectContext) { m_spObjectContext->SetComplete(); }

return S_OK;

}

int CMobileImage::GetEncoderClsid(const WCHAR* format, CLSID* pClsid)

{

using namespace Gdiplus;

UINT  num = 0;          // number of image encoders

UINT  size = 0;         // size of the image encoder array in bytes

ImageCodecInfo* pImageCodecInfo = NULL;

GetImageEncodersSize(&num, &size);

if(size == 0)

return -1;  // Failure

pImageCodecInfo = (ImageCodecInfo*)(malloc(size));

if(pImageCodecInfo == NULL)

return -1;  // Failure

GetImageEncoders(num, size, pImageCodecInfo);

for(UINT j = 0; j < num; ++j)

{

if( wcscmp(pImageCodecInfo[j].MimeType, format) == 0 )

{

*pClsid = pImageCodecInfo[j].Clsid;

free(pImageCodecInfo);

return j;  // Success

}    

}

free(pImageCodecInfo);

return -1;  // Failure

}