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<TD width="95%" height=29><PRE><B><FONT color=#000080><A name=_Toc419881661><SPAN style="mso-bookmark: _Toc419740479"><SPAN style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">五 </SPAN><SPAN lang=EN-US style="LAYOUT-GRID-MODE: line">Visual C++</SPAN></SPAN></A><SPAN style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bookmark: _Toc419740479; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">与多媒体</SPAN></FONT></B></PRE></TD>
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<H2 style="mso-line-height-alt: 1.3pt"><A name=_Toc419881667><SPAN
lang=EN-US
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图像合成</SPAN></A><SPAN lang=EN-US
style="FONT-SIZE: 18pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: Arial"><O:P>
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<P class=MsoNormal
style="WORD-BREAK: break-all; TEXT-INDENT: 20pt; mso-line-height-alt: 1.3pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">假如要实现一个动画例如一只老鼠从屏幕左边往右边跑过去，一般的书上是这么介绍的：首先做一个老鼠的画片，再画一张黑白老鼠掩模图片。首先用掩模图处理屏幕，再用掩模处理老鼠图片，最后把处理过的老鼠贴到屏幕上，前后要处理三个<SPAN
lang=EN-US>BitBlt函数。而且这样处理过程会使屏幕出现明显闪烁。要想制止闪烁还要先做一个兼容DC，先把屏幕图片拷贝至兼容DC，再在兼容DC上处理完老鼠后在再拷贝回屏幕。前后要用到五个BitBlt函数。图片比较小还好，若是图片很大，那速度简直就是“去年今日此电脑，人面老鼠相映红，人面不知何处去，老鼠还在慢慢爬”。是否有其他的解决方法呢？<O:P>
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lang=EN-US
style="FONT-SIZE: 12pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'"> <O:P>
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style="WORD-BREAK: break-all; mso-line-height-alt: 1.3pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple; mso-outline-level: 1"><B
style="mso-bidi-font-weight: normal"><SPAN
style="FONT-SIZE: 12pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">实现透明位图的方式<SPAN
lang=EN-US><O:P> </O:P></SPAN></SPAN></B></P>
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style="MARGIN-LEFT: 18pt; WORD-BREAK: break-all; TEXT-INDENT: -18pt; mso-line-height-alt: 1.3pt; tab-stops: list 18.0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple; mso-list: l75 level1 lfo94"><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">1.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">最愚蠢的办法：直接在屏幕上逐点用<SPAN
lang=EN-US>SetPixel函数画图。<O:P> </O:P></SPAN></SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt; WORD-BREAK: break-all; TEXT-INDENT: -18pt; mso-line-height-alt: 1.3pt; tab-stops: list 18.0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple; mso-list: l75 level1 lfo94"><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">2.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">一般的方法：用<SPAN
lang=EN-US>BitBlt函数作至少三个运算。<O:P> </O:P></SPAN></SPAN></P>
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style="MARGIN-LEFT: 18pt; WORD-BREAK: break-all; TEXT-INDENT: -18pt; mso-line-height-alt: 1.3pt; tab-stops: list 18.0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple; mso-list: l75 level1 lfo94"><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">3.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">最快的方法：直接写屏。<SPAN
lang=EN-US><O:P> </O:P></SPAN></SPAN></P>
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style="MARGIN-LEFT: 18pt; WORD-BREAK: break-all; TEXT-INDENT: -18pt; mso-line-height-alt: 1.3pt; tab-stops: list 18.0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple; mso-list: l75 level1 lfo94"><SPAN
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style="FONT-SIZE: 12pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">4.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">性价比最高的办法：直接写数据缓冲区。</SPAN><SPAN
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style="FONT-SIZE: 12pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'"><O:P>
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<P class=MsoNormal
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style="mso-bidi-font-weight: normal"><SPAN
style="FONT-SIZE: 12pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">四种方式的讨论：<SPAN
lang=EN-US><O:P> </O:P></SPAN></SPAN></B></P>
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lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">1.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">对于初搞图像处理的程序员来说，似乎逐点画过去的办法是第一选择，然而事实证明这是世界上速度最慢的方法，用它实现的最理想的动画效果是“去年一滴相思泪，今日方流到嘴边”。</SPAN><SPAN
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style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'"><O:P>
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lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">2.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><SPAN lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">BitBlt：前面已介绍过，此处不再介绍。<O:P>
</O:P></SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt; WORD-BREAK: break-all; TEXT-INDENT: -18pt; mso-line-height-alt: 1.3pt; tab-stops: list 18.0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple; mso-list: l85 level1 lfo93"><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">3.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">直接写屏：<SPAN
lang=EN-US>Dos下这种方式用得比较多，在windows环境下编程，windows3.1</SPAN></SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">环境</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">下只能加挂<SPAN
lang=EN-US>WinG才能实现，在win95或NT下可用函数</SPAN></SPAN><SPAN lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">CreateDIBSection（）或是使用MicroSoftDirectX函数实现。这种方式我们将出专著介绍。此处不作讨论。<O:P>
</O:P></SPAN></P>
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lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">4.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">写数据缓冲区：这个方法对环境要求较小，不需外挂软件，兼容于<SPAN
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