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C++ 处理图片像素时无法读取内存

//bmps 中装的是CImage
for(int i = 0; i < bmps[nIndex].GetHeight(); i++){
for(int j = 0; j < bmps[nIndex].GetWidth();j++){
BYTE tp1=(BYTE)bmps[nIndex].GetPixelAddress(i,j);
BYTE tp2=(BYTE)bmps[nIndex+1].GetPixelAddress(i,j);
BYTE tpOut=(BYTE)bitmap.GetPixelAddress(i,j);
_asm{
emms
mov eax,fadetA

movupd xmm3,[eax]

mov ebx,fadetB
movupd xmm4,[ebx]

        mov ecx,tp1             
        movupd xmm5,[ecx]//这里tp1无法读取内存
        mov edx,tp2
        movupd xmm6,[edx]

        pxor xmm7,xmm7
        punpcklbw   xmm5,xmm7       
        punpcklbw   xmm6,xmm7
        punpcklbw   xmm3,xmm7       
        punpcklbw   xmm4,xmm7

        pmullw      xmm5,xmm3
        pmullw      xmm6,xmm4
        psrlw       xmm5,8  
        psrlw       xmm6,8  
        paddw       xmm5,xmm6   

        packuswb    xmm5,xmm7               

        mov edi,tpOut
        movsd [edi],xmm5                

        EMMS;           
        }
    }
}
delete []fadetA;
delete []fadetB;
//tmp = bitmap;
//CDC* pDC;
//pDC = GetWindowDC();  
//bitmap.Draw(pDC->m_hDC,0,0);  
Ondraw();

}

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a123456678 2016-03-05 11:33:55 3389 0
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  • CImage* CCatchScreenDlg::LoadCImage( UINT nID, LPCTSTR lpszType, HINSTANCE hInstance ) { CImage* pImage = NULL;

    hInstance = ( NULL == hInstance ) ? ::AfxGetResourceHandle() : hInstance;

    if( RT_BITMAP == lpszType ) { pImage = new CImage(); pImage->LoadFromResource( hInstance, nID ); if ( !pImage->IsNull() ) { return pImage; } else { WriteScreenCatchLog( _T("[CCatchScreenDlg::LoadCImage]CImage::LoadFromResource失败") );

        delete pImage;
        pImage = NULL;
        return NULL;
    }
    

    }

    CString strLog; HRSRC hRsrc = ::FindResource( hInstance, MAKEINTRESOURCE(nID), lpszType ); ASSERT( hRsrc != NULL ); if ( NULL == hRsrc ) { WriteScreenCatchLog( _T("[CCatchScreenDlg::LoadCImage]::FindResource失败") ); return NULL; }

    DWORD dwSize = ::SizeofResource( hInstance, hRsrc); LPBYTE lpRsrc = (LPBYTE)::LoadResource( hInstance, hRsrc); ASSERT( lpRsrc != NULL ); if ( NULL == hRsrc ) { WriteScreenCatchLog( _T("[CCatchScreenDlg::LoadCImage]::LoadResource失败") ); return NULL; }

    HGLOBAL hMem = ::GlobalAlloc( GMEM_FIXED, dwSize ); if ( NULL == hMem ) { WriteScreenCatchLog( _T("[CCatchScreenDlg::LoadCImage]::GlobalAlloc失败") );

    ::FreeResource( lpRsrc );
    return NULL;
    

    }

    LPBYTE pMem = (LPBYTE)::GlobalLock( hMem ); if ( NULL == pMem ) { WriteScreenCatchLog( _T("[CCatchScreenDlg::LoadCImage]::GlobalLock失败") );

    ::GlobalUnlock( hMem );
    ::GlobalFree( hMem );
    ::FreeResource( lpRsrc );
    return NULL;
    

    }

    memcpy( pMem, lpRsrc, dwSize ); IStream * pStream = NULL; HRESULT hr = ::CreateStreamOnHGlobal( hMem, FALSE, &pStream ); if ( pStream != NULL && hr == S_OK ) { pImage = new CImage(); HRESULT hrs = pImage->Load( pStream );

    pStream->Release();
    
    //释放
    ::GlobalUnlock( hMem );
    ::GlobalFree( hMem );
    ::FreeResource( lpRsrc );
    
    if ( hrs == S_OK )
    {
        if ( pImage->GetBPP() == 32 )
        {
            for(int i = 0; i < pImage->GetWidth(); i++)   
            {   
                for(int j = 0; j < pImage->GetHeight(); j++)   
                {   
                    unsigned char* pucColor = reinterpret_cast<unsigned char *>(pImage->GetPixelAddress(i , j));   
                    pucColor[0] = pucColor[0] * pucColor[3] / 255;   
                    pucColor[1] = pucColor[1] * pucColor[3] / 255;   
                    pucColor[2] = pucColor[2] * pucColor[3] / 255;   
                }   
            }
        }
    
        return pImage;
    }
    else
    {
        delete pImage;
        pImage = NULL;
        return NULL;
    }
    

    } else { WriteScreenCatchLog( _T("[CCatchScreenDlg::LoadCImage]::CreateStreamOnHGlobal失败") );

    ::GlobalUnlock( hMem );
    ::GlobalFree( hMem );
    ::FreeResource( lpRsrc );
    return NULL;
    

    } }

    答案来源于网络

    2019-09-27 10:09:05
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