QImage Encoder

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QImageEncoder

GDI+ // MFC
@QImageEncoder.zip (1.65 KB) (새이름으로 저장)
#pragma once
// QImageEncoder
 //
 // Encapsulation of GDI+ GetImageEncoders() function, used to save an Image.
 // Use at your own risk. Comments welcome.
 //
 // Version 1.0 (c) 2003, Sjaak Priester, Amsterdam.
 // mailto:sjaak@sjaakpriester.nl
class QImageEncoder
 {
 public:
         QImageEncoder(LPCTSTR s);
         ~QImageEncoder(void);
 protected:
         CLSID m_Clsid;
         bool m_bStatus;
         CString m_MimeType;
 public:
         Status Save(Image * pImage, LPCTSTR pPath);
         long m_Quality;
         int m_Compression;
 };

// QImageEncoder
 //
 // Encapsulation of GDI+ GetImageEncoders() function, used to save an Image.
 // Use at your own risk. Comments welcome.
 //
 // Version 1.0 (c) 2003, Sjaak Priester, Amsterdam.
 // mailto:sjaak@sjaakpriester.nl
#include "stdafx.h"
 #include "QImageEncoder.h"
// QImageEncoder can be constructed from file path or from mime type
 QImageEncoder::QImageEncoder(LPCTSTR s)
 : m_Quality(100)
 , m_Compression(EncoderValueCompressionLZW)
 {
         m_bStatus = false;
        CString sPath(s);
         sPath.MakeLower();
         int dot = sPath.ReverseFind(_T('.'));
         if (dot > -1) sPath = _T("*") + sPath.Right(sPath.GetLength() - dot);
        UINT count = 0;
         UINT size = 0;
        if (GetImageEncodersSize(& count, & size) != Ok) return;
        BYTE * pBytes = new BYTE[size];
         if (! pBytes) return;
        ImageCodecInfo * pInfo = (ImageCodecInfo *) pBytes;
        if (GetImageEncoders(count, size, pInfo) != Ok) return;
        for (UINT i = 0; i < count; i++)
         {
                 CString sExt(pInfo->FilenameExtension);
                 sExt.MakeLower();
                CString sMime(pInfo->MimeType);
                 sMime.MakeLower();
                if (sMime == sPath || sExt.Find(sPath) >= 0)
                 {
                 m_Clsid = pInfo->Clsid;
                         m_MimeType = sMime;
                         break;
                 }
                 pInfo++;
         }
         delete[] pBytes;
         m_bStatus = (i < count);
 }
QImageEncoder::~QImageEncoder(void)
 {
 }
Status QImageEncoder::Save(Image * pImage, LPCTSTR pPath)
 {
         if (! m_bStatus) return GenericError;
        CString s(pPath);
        EncoderParameters params;
         EncoderParameters * pParams = NULL;
        params.Count = 1;
         params.Parameter[0].Type = EncoderParameterValueTypeLong;
         params.Parameter[0].NumberOfValues = 1;
        if (m_MimeType == _T("image/jpeg"))
         {
                 pParams = & params;
                 params.Parameter[0].Guid = EncoderQuality;
                 params.Parameter[0].Value = & m_Quality;
         }
         else if (m_MimeType == _T("image/tiff"))
         {
                 // With GDI+ 1.0, EncoderValueCompressionLZW and EncoderValueCompressionNone
                 // are the only values that work. EncoderValueCompressionCCITT3, -CCITT4, and -Rle
                 // always let fail a save operation with a InvalidParameter error.
                 // (Could it be that they only work with monochrome bitmaps?)
                 // Because of that, for the time being we leave m_Compression at
                 // EncoderValueCompressionLZW. As this is also the default, we might as well
                 // refrain from setting the parameter alltogether. But we leave the code, as it
                 // probably doesn't hurt.
                 pParams = & params;
                 params.Parameter[0].Guid = EncoderCompression;
                 params.Parameter[0].Value = & m_Compression;
         }
        return pImage->Save(s.AllocSysString(), & m_Clsid, pParams);
 }

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