virtual L_INT LPlayBack::Append(pLBitmap)
Appends a bitmap to a the class object's bitmap list during an animation playback.
Pointer to the bitmap object to be appended to the playback animation. The specified bitmap must be fully allocated, although the image data is not yet loaded when this function is called.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
If you pass NULL in the pLBitmapList parameter of the LPlayBack::Create function, you can use the [LPlayBack:Append function to add bitmaps to the list during the playback. This is useful in the LFile objects load callback functions if you want to play an animated file as it is being loaded. If you need to reference the list after the playback, you can pass the address of an LBitmapList variable when you call the LPlayBack::Destroy function.
The LPlayBack::ValidateLines function lets you validate the lines that the animation playback engine will render to the target bitmap.
Win32, x64.
class LPBUserFile : public LFile
{
HPALETTE m_hPalette;
HWND m_hWnd;
HDC m_hDC;
RECT m_rcPaint;
public:
LPlayBack m_PlayBack; // playback handle
LPBUserFile(HWND hwnd, LBitmapBase *pBitmapBase);
virtual ~LPBUserFile();
virtual L_INT LoadFileCallBack(pFILEINFO pFileInfo,
LBitmapBase * pLBitmap,
LBuffer * pLBuffer,
L_UINT uFlags,
L_INT nRow,
L_INT nLines);
virtual L_INT LoadFile(L_INT nBitsPerPixel=0,
L_INT nOrder=ORDER_BGR);
};
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
LPBUserFile::LPBUserFile(HWND hwnd, LBitmapBase *pBitmapBase):LFile(pBitmapBase)
{
m_hWnd = hwnd;
m_hDC = GetDC(m_hWnd); // DC will be released in the destructor
GetClientRect(m_hWnd, &m_rcPaint);
// Enable LoadInfoCallBack
EnableCallBack(TRUE);
}
LPBUserFile::~LPBUserFile()
{
ReleaseDC(m_hWnd, m_hDC);
}
L_INT LPBUserFile::LoadFileCallBack(
pFILEINFO pFileInfo,
LBitmapBase *pBitmap,
LBuffer * pLBuffer,
L_UINT uFlags,
L_INT nRow,
L_INT nLines
)
{
UNREFERENCED_PARAMETER(pFileInfo);
UNREFERENCED_PARAMETER(pLBuffer);
L_INT nRet; // Return value
L_UINT uState; // Next state in the playback
RECT rcUpdate; // Source clipping rectangle used in playback
L_INT nCounter;
// If this is the first row of a bitmap ...
if (uFlags & FILEREAD_FIRSTROW)
{
// Append the bitmap to the list
nRet = m_PlayBack.Append(pBitmap);
if(nRet != SUCCESS)
return(nRet);
}
// Validate the lines in the bitmap so that we can paint them
m_PlayBack.ValidateLines(nRow, nLines);
uState = m_PlayBack.GetState ();
while(uState != PLAYSTATE_END)
{
// Play the animation
uState = m_PlayBack.Process();
switch(uState)
{
case PLAYSTATE_WAITINPUT:
case PLAYSTATE_WAITDELAY :
if (m_PlayBack.GetDelay () > 10)
m_PlayBack.CancelWait ();
break;
case PLAYSTATE_POSTCLEAR:
case PLAYSTATE_POSTRENDER:
m_PlayBack.GetUpdateRect(&rcUpdate, TRUE);
m_PlayBack.GetBitmap()->SetClipSrcRect(&rcUpdate);
m_PlayBack.GetBitmap()->SetDstRect(&m_rcPaint);
m_PlayBack.GetBitmap()->Paint()->SetDC(m_hDC);
m_PlayBack.GetBitmap()->CreatePaintPalette (m_hDC);
m_PlayBack.GetBitmap()->Paint()->PaintDC();
break;
}
nCounter = m_PlayBack.GetIndex();
// do any processing on specific indexes
break;
}
return(SUCCESS);
}
L_INT LPBUserFile::LoadFile(L_INT nBitsPerPixel,L_INT nOrder)
{
m_PlayBack.Create (m_pBitmap);
return LFile::LoadFile (nBitsPerPixel, nOrder, LOADFILE_ALLOCATE | LOADFILE_STORE | LOADFILE_ALLPAGES);
}
L_INT LPlayBack__AppendExample(HWND hWnd)
{
L_INT nRet;
// this will call the default constructor
LBitmap LeadBitmap;
L_TCHAR szFileName[256] ;
lstrcpy(szFileName,MAKE_IMAGE_PATH(TEXT("eye.gif")));
FILEINFO FileInfo;
// create instance from User File
LPBUserFile UserFile(hWnd, 0);
// Attach a bitmap to the UserFile Object
UserFile.SetBitmap (&LeadBitmap);
// attach a file name to UserFile Object
UserFile.SetFileName(szFileName);
// get the info of the file object
nRet = UserFile.GetInfo (&FileInfo, sizeof(FileInfo));
if(nRet != SUCCESS)
return nRet;
// create the bitmap
nRet = LeadBitmap.Create(FileInfo.Width, FileInfo.Height, FileInfo.BitsPerPixel, FileInfo.Order);
if(nRet != SUCCESS)
return nRet;
// load the file
nRet = UserFile.LoadFile();
if(nRet != SUCCESS)
return nRet;
return SUCCESS;
}
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