如何在带有透明背景的CDC上呈现CRichEditCtrl?(MFC)
我需要在屏幕上显示并打印的图形上下文中使用透明背景渲染CRichEditCtrl内容的帮助。 现在我有以下代码,除了透明度问题外,这些代码运行良好:如何在带有透明背景的CDC上呈现CRichEditCtrl?(MFC),mfc,transparency,gdi,metafile,cricheditctrl,Mfc,Transparency,Gdi,Metafile,Cricheditctrl,我需要在屏幕上显示并打印的图形上下文中使用透明背景渲染CRichEditCtrl内容的帮助。 现在我有以下代码,除了透明度问题外,这些代码运行良好: CRichEditCtrl ctrl; // my CRichEditCtrl CDC *dc; // - my graphical context dc->SetBkMode(TRANSPARENT); dc->DPtoHIMETRIC(&targetSize); CRect cHiMetricRect( 0, 0, ori
CRichEditCtrl ctrl; // my CRichEditCtrl
CDC *dc; // - my graphical context
dc->SetBkMode(TRANSPARENT);
dc->DPtoHIMETRIC(&targetSize);
CRect cHiMetricRect( 0, 0, origSize.cx*factor,origSize.cy*factor);
CRect cTwipsRect( 0, 0, (TWIPS_INCH * targetSize.cx + HIMETRIC_INCH / 2) / HIMETRIC_INCH, (TWIPS_INCH * targetSize.cy + HIMETRIC_INCH / 2) / HIMETRIC_INCH);
CMetaFileDC metaFile;
metaFile.CreateEnhanced( dc, NULL, cHiMetricRect, NULL );
metaFile.SetBkMode(TRANSPARENT);
metaFile.SetAttribDC( dc->m_hDC );
FORMATRANGE stFR;
stFR.hdcTarget = stFR.hdc = metaFile.m_hDC;
stFR.rcPage = stFR.rc = cTwipsRect;
stFR.chrg.cpMin = 0;
stFR.chrg.cpMax = -1;
ctrl.FormatRange( &stFR, TRUE);
ctrl.FormatRange( NULL, TRUE);
HENHMETAFILE hMetaFile = metaFile.CloseEnhanced();
dc->PlayMetaFile(hMetaFile,&cr);
DeleteEnhMetaFile(hMetaFile);
我需要以透明的方式呈现此文本,因为已经有东西绘制在我的DC上。
我试图在网上搜索有关图元文件和透明度的任何帮助,但没有找到足够的帮助。我将非常感谢您的帮助。我对图元文件不是很确定,但我已经使用straight WinAPI对EMFs做了类似的事情,它确实有效——调用
EnumEnhMetaFile
而不是PlayMetaFile
,例如:
BOOL bFirstTime = TRUE;
EnumEnhMetaFile(hDC, m_hEmf, (ENHMFENUMPROC)EmfEnumProc_Play_TranspBackground, &bFirstTime, &rc);
其中,EnumProc定义为
int CALLBACK EmfEnumProc_Play_TranspBackground(HDC hDC, LPHANDLETABLE lpHTable, LPENHMETARECORD lpEMFR, int nObj, LPARAM lpData)
{ BOOL bOK;
if (lpEMFR->iType == EMR_SETBKMODE)
{ EMRSETBKMODE* lpEMRBkMode = (EMRSETBKMODE*) lpEMFR;
if (lpEMRBkMode->iMode == OPAQUE)
{ EMRSETBKMODE EmrBkMode;
EmrBkMode.emr.iType = EMR_SETBKMODE;
EmrBkMode.emr.nSize = (sizeof(EmrBkMode) % 4 == 0 ? sizeof(EmrBkMode) : (((sizeof(EmrBkMode) / 4) + 1) * 4));
EmrBkMode.iMode = TRANSPARENT;
bOK = PlayEnhMetaFileRecord(hDC, lpHTable, (LPENHMETARECORD)&EmrBkMode, (UINT)nObj);
return bOK;
}
}
bOK = PlayEnhMetaFileRecord(hDC, lpHTable, lpEMFR, (UINT)nObj);
if (lpEMFR->iType == EMR_HEADER)
{ BOOL* pbFirstTime = (BOOL*)lpData;
if (*pbFirstTime)
{ EMRSETBKMODE EmrBkMode;
EmrBkMode.emr.iType = EMR_SETBKMODE;
EmrBkMode.emr.nSize = (sizeof(EmrBkMode) % 4 == 0 ? sizeof(EmrBkMode) : (((sizeof(EmrBkMode) / 4) + 1) * 4));
EmrBkMode.iMode = TRANSPARENT;
PlayEnhMetaFileRecord(hDC, lpHTable, (LPENHMETARECORD)&EmrBkMode, (UINT)nObj);
*pbFirstTime = FALSE;
}
}
return bOK;
}
我对图元文件不是很确定,但我已经使用straight WinAPI对EMFs做了类似的操作,它确实可以工作——调用
EnumEnhMetaFile
,而不是PlayMetaFile
,例如:
BOOL bFirstTime = TRUE;
EnumEnhMetaFile(hDC, m_hEmf, (ENHMFENUMPROC)EmfEnumProc_Play_TranspBackground, &bFirstTime, &rc);
其中,EnumProc定义为
int CALLBACK EmfEnumProc_Play_TranspBackground(HDC hDC, LPHANDLETABLE lpHTable, LPENHMETARECORD lpEMFR, int nObj, LPARAM lpData)
{ BOOL bOK;
if (lpEMFR->iType == EMR_SETBKMODE)
{ EMRSETBKMODE* lpEMRBkMode = (EMRSETBKMODE*) lpEMFR;
if (lpEMRBkMode->iMode == OPAQUE)
{ EMRSETBKMODE EmrBkMode;
EmrBkMode.emr.iType = EMR_SETBKMODE;
EmrBkMode.emr.nSize = (sizeof(EmrBkMode) % 4 == 0 ? sizeof(EmrBkMode) : (((sizeof(EmrBkMode) / 4) + 1) * 4));
EmrBkMode.iMode = TRANSPARENT;
bOK = PlayEnhMetaFileRecord(hDC, lpHTable, (LPENHMETARECORD)&EmrBkMode, (UINT)nObj);
return bOK;
}
}
bOK = PlayEnhMetaFileRecord(hDC, lpHTable, lpEMFR, (UINT)nObj);
if (lpEMFR->iType == EMR_HEADER)
{ BOOL* pbFirstTime = (BOOL*)lpData;
if (*pbFirstTime)
{ EMRSETBKMODE EmrBkMode;
EmrBkMode.emr.iType = EMR_SETBKMODE;
EmrBkMode.emr.nSize = (sizeof(EmrBkMode) % 4 == 0 ? sizeof(EmrBkMode) : (((sizeof(EmrBkMode) / 4) + 1) * 4));
EmrBkMode.iMode = TRANSPARENT;
PlayEnhMetaFileRecord(hDC, lpHTable, (LPENHMETARECORD)&EmrBkMode, (UINT)nObj);
*pbFirstTime = FALSE;
}
}
return bOK;
}
我使用了EnumEnhMetaFile函数:
EnumEnhMetaFile(dc->m_hDC, hMetaFile, myMetafileProc, NULL, rect );
然后我使用回调过程来检索图元文件的每条记录:
int metafileProc( HDC hDC, HANDLETABLE *lpHTable, const ENHMETARECORD *lpEMFR, int nObj, LPARAM lpData) {
if ( lpEMFR->iType == EMR_EXTTEXTOUTW ) {
COLORREF_STRUCT *c = (COLORREF_STRUCT *)&(lastBgColor);
EMR_EXTTEXTOUTW_STRUCT *s = (EMR_EXTTEXTOUTW_STRUCT *)lpEMFR;
s->textStruct.options = 0x00;
if ( bgColorFlag ) {
bgColorFlag = false;
renderRect( hDC, s->textStruct.rect, c );
}
PlayEnhMetaFileRecord( hDC, lpHTable, lpEMFR, nObj );
} else if ( lpEMFR->iType == EMR_SETBKCOLOR ) {
BYTE *ptr = (BYTE*)lpEMFR;
COLORREF temp = *((COLORREF*)(ptr+8));
if ( temp != 0xFFFFFF ) {
lastBgColor = temp;
bgColorFlag = true;
}
}
return 1;
}
其中renderRect(hDC,s->textStruct.rect,c)是一个用c颜色绘制透明背景的函数。我必须为文本设置零选项标志,因为在Windows XP、Windows 7和Windows 8中有不同的行为-之后一切正常。谢谢你的帮助。致以最诚挚的问候。我使用了EnumenMetaFile函数:
EnumEnhMetaFile(dc->m_hDC, hMetaFile, myMetafileProc, NULL, rect );
然后我使用回调过程来检索图元文件的每条记录:
int metafileProc( HDC hDC, HANDLETABLE *lpHTable, const ENHMETARECORD *lpEMFR, int nObj, LPARAM lpData) {
if ( lpEMFR->iType == EMR_EXTTEXTOUTW ) {
COLORREF_STRUCT *c = (COLORREF_STRUCT *)&(lastBgColor);
EMR_EXTTEXTOUTW_STRUCT *s = (EMR_EXTTEXTOUTW_STRUCT *)lpEMFR;
s->textStruct.options = 0x00;
if ( bgColorFlag ) {
bgColorFlag = false;
renderRect( hDC, s->textStruct.rect, c );
}
PlayEnhMetaFileRecord( hDC, lpHTable, lpEMFR, nObj );
} else if ( lpEMFR->iType == EMR_SETBKCOLOR ) {
BYTE *ptr = (BYTE*)lpEMFR;
COLORREF temp = *((COLORREF*)(ptr+8));
if ( temp != 0xFFFFFF ) {
lastBgColor = temp;
bgColorFlag = true;
}
}
return 1;
}
其中renderRect(hDC,s->textStruct.rect,c)是一个用c颜色绘制透明背景的函数。我必须为文本设置零选项标志,因为在Windows XP、Windows 7和Windows 8中有不同的行为-之后一切正常。谢谢你的帮助。致以最良好的祝愿