📄 vc实现卡拉ok字幕叠加_4.htm
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<TD colSpan=2><FONT class=f21><B>[文章信息]</B></FONT></TD></TR>
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<TD vAlign=top width=62>作者:</TD>
<TD vAlign=top width=158><FONT
color=#0e3e92>陆其明</FONT></TD></TR>
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<TD vAlign=top>时间:</TD>
<TD vAlign=top><FONT
color=#0e3e92>2003-11-21</FONT></TD></TR>
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<TD vAlign=top>出处:</TD>
<TD vAlign=top><FONT color=#0e3e92>VCHelp</FONT></TD></TR>
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<TD vAlign=top>责任编辑:</TD>
<TD vAlign=top><FONT color=#0e3e92>方舟</FONT></TD></TR>
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<TD colSpan=2><FONT class=f21><B>[文章导读]</B></FONT></TD></TR>
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<TD vAlign=top colSpan=2><SPAN
class=f14>本文介绍了卡拉OK字幕叠加的一般原理以及VC上使用GDI的一种简单实现</SPAN></TD></TR>
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<TD><SPAN class=f14> <STRONG>四.
性能优化<BR></STRONG><BR> 我们在演示中发现，频繁地直接在窗口DC中画图会带来一定的闪烁感。对此，我们可以进行一下优化，即首先创建一个与目标窗口DC兼容的内存DC，在这个内存DC中画好字幕后，再将字幕位图从内存DC拷贝到目标窗口DC中去。<BR><BR> 我们可以参考CSubtitleController类的DrawSubtitle2函数的实现：<BR><BR>BOOL
CSubtitleController::DrawSubtitle2(DWORD
inStreamTime)<BR>{<BR>ASSERT(mClientDC);<BR><BR>RECT
bounds;<BR>mTargetWnd->GetClientRect(&bounds);<BR>int
wndWidth = bounds.right - bounds.left;<BR>int wndHeight =
bounds.bottom - bounds.top;<BR><BR>CDC memDC;<BR>//
创建与目标窗口DC兼容的内存DC<BR>memDC.CreateCompatibleDC(mClientDC);<BR>//
创建与目标窗口DC兼容的位图<BR>HBITMAP membmp =
CreateCompatibleBitmap(mClientDC->GetSafeHdc(),wndWidth,wndHeight);<BR>//
将位图选入内存DC<BR>HBITMAP oldbmp = (HBITMAP)
memDC.SelectObject(membmp);<BR>FillRect(memDC.GetSafeHdc(),
&bounds,
(HBRUSH)GetStockObject(LTGRAY_BRUSH));<BR><BR>/*-----------------
以下字幕操作都在内存DC中进行 ----------------*/<BR>DWORD timeInChar = 0; <BR>LONG
sungLength = 0;<BR>int currentChar = LocateChar(inStreamTime,
timeInChar);<BR>if (currentChar != -1)<BR>{<BR>sungLength =
mFromToArray[currentChar].size.cx * timeInChar;<BR>sungLength =
sungLength / mFromToArray[currentChar].duration; <BR>for (int i = 0;
i < currentChar; i++)<BR>{<BR>sungLength +=
mFromToArray[i].size.cx;<BR>}<BR>}<BR>else<BR>{<BR>sungLength =
mTotalWidth;<BR>}<BR><BR>CFont * pOldFont = (CFont *)
memDC.SelectObject(&mTextFont);<BR>memDC.SetBkMode(TRANSPARENT);<BR><BR>mSungRegion.CreateRectRgn(mStartPoint.x,
mStartPoint.y, <BR>mStartPoint.x + sungLength, mStartPoint.y +
mFromToArray[0].size.cy);<BR>mSingingRegion.CreateRectRgn(mStartPoint.x
+ sungLength, mStartPoint.y, <BR>mStartPoint.x + mTotalWidth,
mStartPoint.y + mFromToArray[0].size.cy);<BR><BR>// Draw the first
part which has been sung<BR>int ret =
memDC.SelectClipRgn(&mSungRegion, RGN_COPY);
<BR>memDC.SetPolyFillMode(WINDING);<BR>HPEN pOldPen = (HPEN)
memDC.SelectObject(mSungBoundaryPen);<BR>HBRUSH pOldBrush = (HBRUSH)
memDC.SelectObject(mSungTextBrush);<BR>memDC.BeginPath();
<BR>memDC.TextOut(mStartPoint.x, mStartPoint.y, mSubtitleLine);
<BR>memDC.EndPath();
<BR>memDC.StrokeAndFillPath();<BR>memDC.SelectClipPath(RGN_AND);<BR>memDC.SelectObject(pOldPen);<BR>memDC.SelectObject(pOldBrush);<BR><BR>//
Draw the second part which is waiting for being sung<BR>pOldPen =
(HPEN) memDC.SelectObject(mSingingBoundaryPen);<BR>pOldBrush =
(HBRUSH)
memDC.SelectObject(mSingingTextBrush);<BR>memDC.SelectClipRgn(&mSingingRegion,
RGN_COPY); <BR>memDC.BeginPath(); <BR>memDC.TextOut(mStartPoint.x,
mStartPoint.y, mSubtitleLine);
<BR>memDC.EndPath();<BR>memDC.StrokePath();<BR>memDC.SelectClipPath(RGN_AND);<BR>memDC.SelectObject(pOldBrush);<BR>memDC.SelectObject(pOldPen);<BR>mSungRegion.DeleteObject();<BR>mSingingRegion.DeleteObject();<BR><BR>memDC.SelectObject(pOldFont);<BR>//
将内存DC中的位图拷贝到目标窗口DC中<BR>mClientDC->BitBlt(0, 0, wndWidth,
wndHeight, &memDC, 0, 0, SRCCOPY);<BR>//
删除内存DC及使用的资源<BR>memDC.SelectObject(oldbmp);<BR>DeleteObject(membmp);<BR>memDC.DeleteDC();<BR><BR>return
(currentChar != -1);<BR>}<BR><BR> <STRONG>五.
结束语<BR></STRONG><BR> 本文介绍了卡拉OK字幕叠加的一般原理以及VC上使用GDI的一种简单实现，并且提供了完整的示例源代码，希望能够对读者朋友们有所启示。<BR><BR> <A
href="ftp://ftp1.mydown.com/home1/soft34/kf1051.zip"
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