Symbian

开发平台：
C/C++

symbimgdec.cpp：源码内容
							/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
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 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
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 * it created. 
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 * ***** END LICENSE BLOCK ***** */ 
#include "hxtypes.h"
#include "hxwintyp.h"
#include "hlxclib/string.h"
#include "hxcom.h"
#include "hxccf.h"
#include "ihxpckts.h"
#include "hxvsurf.h"
#include "unifimg.h"
#include "nativeimgdec.h"
#include "MdaImageConverter.h"
#include "platform/symbian/symbimgdec.h"
CSymbianImageDecoder::CSymbianImageDecoder() : CNativeImageDecoder()
{
    m_pConverter   = NULL;
    m_pBitmap      = NULL;
    m_pInputBuffer = NULL;
    m_pInput       = NULL;
    m_ulState      = kStateReady;
    m_bIsWBMP      = FALSE;
    m_pFormat      = NULL;
    m_pCodec       = NULL;
}
CSymbianImageDecoder::~CSymbianImageDecoder()
{
    HX_DELETE(m_pConverter);
    HX_DELETE(m_pBitmap);
    HX_RELEASE(m_pInputBuffer);
    HX_DELETE(m_pInput);
    HX_DELETE(m_pFormat);
    HX_DELETE(m_pCodec);
    m_ulState = kStateReady;
}
STDMETHODIMP CSymbianImageDecoder::Decode(IUnknown*                    pContext,
                                          CNativeImageDecoderResponse* pResponse,
                                          IHXBuffer*                   pBuffer,
                                          IHXBuffer*                   pMimeTypeStr)
{
    HX_RESULT retVal = HXR_FAIL;
    if (pContext && pResponse && pBuffer && pMimeTypeStr)
    {
        // Save a copy of the context
        HX_RELEASE(m_pContext);
        m_pContext = pContext;
        m_pContext->AddRef();
        // Save a pointer to the response
        m_pResponse = pResponse;
        // Save a ref to the input buffer
        HX_RELEASE(m_pInputBuffer);
        m_pInputBuffer = pBuffer;
        m_pInputBuffer->AddRef();
        // Check if this is WBMP
        m_bIsWBMP = FALSE;
        const char* pszMimeType = (const char*) pMimeTypeStr->GetBuffer();
        if (pszMimeType &&
            (!strcmp(pszMimeType, IMAGE_MIMETYPE_WBMP) ||
             !strcmp(pszMimeType, IMAGE_MIMETYPE_WBMP_STREAMED)))
        {
            m_bIsWBMP = TRUE;
        }
        // Get the common class factory
        HX_RELEASE(m_pFactory);
        retVal = m_pContext->QueryInterface(IID_IHXCommonClassFactory,
                                            (void**) &m_pFactory);
        if (SUCCEEDED(retVal))
        {
            // Create a TPtrC8 object to hold the input buffer
            HX_DELETE(m_pInput);
            m_pInput = new TPtrC8((const TUint8*) m_pInputBuffer->GetBuffer(),
                                  (TInt) m_pInputBuffer->GetSize());
            if (m_pInput)
            {
                // Create the CMdaImageFileToBitmapUtility object
                HX_DELETE(m_pConverter);
                m_pConverter = CMdaImageDescToBitmapUtility::NewL(*this);
                if (m_pConverter)
                {
                    // Create WBMP-related objects if necessary
                    HX_DELETE(m_pFormat);
                    HX_DELETE(m_pCodec);
                    if (m_bIsWBMP)
                    {
                        m_pFormat = new TMdaWbmpClipFormat();
                        m_pCodec  = new TMdaWbmpCodec();
                    }
                    // Set the state
                    m_ulState = kStateOpenCompletePending;
                    // Clear the return value
                    retVal = HXR_OK;
                    // Call the asynch OpenL() method
                    m_pConverter->OpenL(*m_pInput, m_pFormat, m_pCodec);
                }
            }
        }
    }
    return retVal;    
}
void CSymbianImageDecoder::MiuoOpenComplete(TInt aError)
{
    if (m_ulState == kStateOpenCompletePending)
    {
        // We don't need the format and codec objects any more
        HX_DELETE(m_pFormat);
        HX_DELETE(m_pCodec);
        // Save our status
        TInt tErr = aError;
        if (tErr == KErrNone)
        {
            // Get the size of the image
            TFrameInfo frameInfo;
            m_pConverter->FrameInfo(0, frameInfo);
            // Create a bitmap
            HX_DELETE(m_pBitmap);
            m_pBitmap = new CFbsBitmap();
            if (m_pBitmap)
            {
                tErr = m_pBitmap->Create(frameInfo.iOverallSizeInPixels,
                                         EColor4K);
                if (tErr == KErrNone)
                {
                    // Set the state
                    m_ulState = kStateConvertCompletePending;
                    // Make the asynch call to ConvertL()
                    m_pConverter->ConvertL(*m_pBitmap, 0);
                }
            }
            else
            {
                tErr = KErrNoMemory;
            }
        }
        if (tErr != KErrNone)
        {
            // Set the state
            m_ulState = kStateReady;
            // Call back failure
            m_pResponse->DecodeDone(HXR_FAIL, NULL, NULL);
        }
    }
}
void CSymbianImageDecoder::MiuoConvertComplete(TInt aError)
{
    if (m_ulState == kStateConvertCompletePending)
    {
        // Set the state
        m_ulState = kStateReady;
        // Check the error
        HX_RESULT retVal = HXR_FAIL;
        // Check the error return
        if (aError == KErrNone)
        {
            // Get the bitmap size
            TSize cSize = m_pBitmap->SizeInPixels();
            // Set the bitmap info header
            HXBitmapInfoHeader cHdr;
            cHdr.biSize          = 52;
            cHdr.biWidth         = (INT32) cSize.iWidth;
            cHdr.biHeight        = (INT32) cSize.iHeight;
            cHdr.biPlanes        = 1;
            cHdr.biBitCount      = 16;
            cHdr.biCompression   = HX_BITFIELDS;
            cHdr.biSizeImage     = 0;
            cHdr.biXPelsPerMeter = 0;
            cHdr.biYPelsPerMeter = 0;
            cHdr.biClrUsed       = 0;
            cHdr.biClrImportant  = 0;
            cHdr.rcolor          = 0x0F00;
            cHdr.gcolor          = 0x00F0;
            cHdr.bcolor          = 0x000F;
            // Create an IHXBuffer
            IHXBuffer* pOutBuffer = NULL;
            retVal = m_pFactory->CreateInstance(CLSID_IHXBuffer,
                                                (void**) &pOutBuffer);
            if (SUCCEEDED(retVal))
            {
                // Get the length of scanline in bytes
                UINT32 ulByteWidth  = (UINT32) CFbsBitmap::ScanLineLength(cSize.iWidth,
                                                                          m_pBitmap->DisplayMode());
                // Get the total number of bytes in the bitmap
                UINT32 ulTotalBytes = ulByteWidth * cSize.iHeight;
                // Set the output buffer
                retVal = pOutBuffer->Set((const BYTE*) m_pBitmap->DataAddress(),
                                         ulTotalBytes);
                if (SUCCEEDED(retVal))
                {
                    // Call back to the response
                    m_pResponse->DecodeDone(HXR_OK, &cHdr, pOutBuffer);
                }
            }
            // Now we can clean up
            HX_RELEASE(pOutBuffer);
            HX_DELETE(m_pInput);
            HX_RELEASE(m_pInputBuffer);
            HX_DELETE(m_pBitmap);
            HX_DELETE(m_pConverter);
        }
        if (FAILED(retVal))
        {
            m_pResponse->DecodeDone(HXR_FAIL, NULL, NULL);
        }
    }
}
void CSymbianImageDecoder::MiuoCreateComplete(TInt aError)
{
}

						