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<div class=Section1>
<h1><a name="_Toc497742450"></a><a name="_Hlt465781354"></a><span
style='mso-bookmark:_Toc497742450'>Bitmaps</span></h1>
<div style='border:none;border-bottom:solid windowtext .5pt;padding:0in 0in 1.0pt 0in'>
<h2><a name="_Toc497742451">Bitmaps Contents</a><span
style='font-size:12.0pt;font-variant:normal;color:windowtext;mso-bidi-language:
AR-SA;mso-bidi-font-weight:normal'><o:p></o:p></span></h2>
</div>
<p class=MsoToc2 style='tab-stops:right dotted 431.5pt'><span style='font-variant:
normal;text-transform:uppercase'>Bitmaps</span><span
style='font-size:12.0pt;font-variant:normal;color:windowtext;mso-bidi-language:
AR-SA;mso-bidi-font-weight:normal'><o:p></o:p></span></p>
<p class=MsoToc4 style='tab-stops:right dotted 431.5pt'>DefineBits<span
style='font-size:12.0pt;color:windowtext;mso-bidi-language:AR-SA;mso-bidi-font-weight:
normal'><o:p></o:p></span></p>
<p class=MsoToc4 style='tab-stops:right dotted 431.5pt'>DefineBitsJPEG2<span
style='font-size:12.0pt;color:windowtext;mso-bidi-language:AR-SA;mso-bidi-font-weight:
normal'><o:p></o:p></span></p>
<p class=MsoToc4 style='tab-stops:right dotted 431.5pt'>DefineBitsJPEG3<span
style='font-size:12.0pt;color:windowtext;mso-bidi-language:AR-SA;mso-bidi-font-weight:
normal'><o:p></o:p></span></p>
<p class=MsoToc4 style='tab-stops:right dotted 431.5pt'>DefineBitsLossless<span
style='font-size:12.0pt;color:windowtext;mso-bidi-language:AR-SA;mso-bidi-font-weight:
normal'><o:p></o:p></span></p>
<p class=MsoToc4 style='tab-stops:right dotted 431.5pt'>DefineBitsLossless2<span
style='mso-tab-count:1 dotted'> </span><span
style='font-size:12.0pt;color:windowtext;mso-bidi-language:AR-SA;mso-bidi-font-weight:
normal'><o:p></o:p></span></p>
<p class=MsoToc4 style='tab-stops:right dotted 431.5pt'>JPEGTables<span
style='font-size:12.0pt;color:windowtext;mso-bidi-language:AR-SA;mso-bidi-font-weight:
normal'><o:p></o:p></span></p>
<p class=MsoToc2 style='tab-stops:right dotted 431.5pt'><span style='font-variant:
normal;text-transform:uppercase'>Macromedia Flash File Format (SWF) SDK Examples</span><span
style='font-size:12.0pt;font-variant:normal;color:windowtext;mso-bidi-language:
AR-SA;mso-bidi-font-weight:normal'><o:p></o:p></span></p>
<p class=MsoNormal><!--[if supportFields]><span style='mso-element:field-end'></span><![endif]--><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
<b style='mso-bidi-font-weight:normal'><span style='font-size:12.0pt;
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clear=all style='page-break-before:always'>
</span></b>
<div style='border:none;border-bottom:solid windowtext .5pt;padding:0in 0in 1.0pt 0in'>
<h2><a name="_Toc497742452">Bitmaps</a></h2>
</div>
<p>Macromedia Flash (SWF) supports a variety of bitmap formats. One JPEG format
has a JPEG header that is shared between multiple JPEG images in a single
Macromedia Flash (SWF) file to minimize file size. Another JPEG format lets
each image have it's own header, allowing each image its own compression
settings. The zlib format is similar to an embedded PNG file and is used when
you need lossless image compression. This is best for images that would
compress well as a GIF file like screen shots or diagrams, while JPEG is best
for photographs. </p>
<p>Bitmaps in Macromedia Flash (SWF) can also contain alpha channel
information. For lossless compression, there can be alpha channel information
in a color table of an 8-bit image or there can be full alpha channel
information for a 32-bit image. For JPEG images, alpha channels are stored
using lossless zlib compression. </p>
<p>Note that when a bitmap in a Macromedia Flash (SWF) file is rendered, the
full transform operation is applied to the image including the matrix
transformation and the color transform operation. </p>
<h4><a name="_Toc497742453"></a><a name=h4DefineBits></a><span
style='mso-bookmark:_Toc497742453'>DefineBits</span></h4>
<p>Defines a bitmap character with JPEG compression. This tag contains only the
JPEG compressed image data (as defined by the Independent JPEG Group).
JPEGTables contains the JPEG encoding data used to encode this image. (SWF 1.0)
</p>
<p><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
<p>(See class <a
href="..\..\Microsoft_Word\Macromedia_%20Flash_(SWF)_Manager_Documentation\API_Docs\class_fdtdefinebits.html">FDTDefine<span
style='mso-bookmark:_Hlt466375205'>B</span>its</a><![if !supportNestedAnchors]><a
name="_Hlt466375205"></a><![endif]> in the Macromedia Flash File Format (SWF)
SDK)</p>
<p><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
<table border=1 cellspacing=0 cellpadding=0 style='margin-left:17.7pt;
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<tr>
<td width=564 colspan=3 valign=top style='width:422.7pt;border:solid navy .75pt;
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<p class=MsoNormal><b><span style='font-family:Tahoma;mso-bidi-font-family:
"Times New Roman";color:white'>DefineBits<o:p></o:p></span></b></p>
</td>
</tr>
<tr>
<td width=171 valign=top style='width:128.3pt;border:solid navy .75pt;
border-top:none;mso-border-top-alt:solid navy .75pt;background:white;
padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><b><span style='color:windowtext'>Field</span></b><b><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></b></p>
</td>
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solid navy .75pt;mso-border-left-alt:solid navy .75pt;background:white;
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<p class=MsoNormal><b><span style='color:windowtext'>Type</span></b><b><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></b></p>
</td>
<td width=198 valign=top style='width:148.3pt;border-top:none;border-left:
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<p class=MsoNormal><b><span style='color:windowtext'>Comment</span></b><b><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></b></p>
</td>
</tr>
<tr>
<td width=171 valign=top style='width:128.3pt;border:solid navy .75pt;
border-top:none;mso-border-top-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>Header</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
<td width=195 valign=top style='width:146.1pt;border-top:none;border-left:
none;border-bottom:solid navy .75pt;border-right:solid navy .75pt;mso-border-top-alt:
solid navy .75pt;mso-border-left-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>RECORDHEADER</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
<td width=198 valign=top style='width:148.3pt;border-top:none;border-left:
none;border-bottom:solid navy .75pt;border-right:solid navy .75pt;mso-border-top-alt:
solid navy .75pt;mso-border-left-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>Tag ID = 6</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width=171 valign=top style='width:128.3pt;border:solid navy .75pt;
border-top:none;mso-border-top-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>BitmapId</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
<td width=195 valign=top style='width:146.1pt;border-top:none;border-left:
none;border-bottom:solid navy .75pt;border-right:solid navy .75pt;mso-border-top-alt:
solid navy .75pt;mso-border-left-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>UI16</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
<td width=198 valign=top style='width:148.3pt;border-top:none;border-left:
none;border-bottom:solid navy .75pt;border-right:solid navy .75pt;mso-border-top-alt:
solid navy .75pt;mso-border-left-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>ID for this character</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width=171 valign=top style='width:128.3pt;border:solid navy .75pt;
border-top:none;mso-border-top-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>BitmapJPEGImage</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
<td width=195 valign=top style='width:146.1pt;border-top:none;border-left:
none;border-bottom:solid navy .75pt;border-right:solid navy .75pt;mso-border-top-alt:
solid navy .75pt;mso-border-left-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>UI8[image data size]</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
<td width=198 valign=top style='width:148.3pt;border-top:none;border-left:
none;border-bottom:solid navy .75pt;border-right:solid navy .75pt;mso-border-top-alt:
solid navy .75pt;mso-border-left-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>JPEG compressed image</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
</tr>
</table>
<h4><a name=h4DefineBitsJPEG2></a><![if !supportEmptyParas]> <![endif]><o:p></o:p></h4>
<h4><a name="_Toc497742454">DefineBitsJPEG2</a></h4>
<p>Defines a bitmap character with JPEG compression. This tag differs from
DefineBits in that the record contains both the JPEG encoding table and the
JPEG image data (as defined by the Independent JPEG Group). This record allows
multiple JPEG images with differing compression ratios to be defined within a
single SWF file. </p>
<p><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
<p>Note: The JPEG encoding data and image data contained within this record are
in two separate JPEG streams. Each JPEG stream has a beginning of stream tag
(0xFF, 0xD8) and an end of stream tag (0xFF, 0xD9). This differs from a
standard JPEG image which combines the encoding data and image data into a
single stream. (SWF 2.0) </p>
<p><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
<p>(See class <a
href="..\..\Microsoft_Word\Macromedia_%20Flash_(SWF)_Manager_Documentation\API_Docs\class_fdtdefinebitsjpeg2.html">FDTDefineBits<span
style='mso-bookmark:_Hlt466375243'>J</span>PEG2</a><![if !supportNestedAnchors]><a
name="_Hlt466375243"></a><![endif]> in the Macromedia Flash File Format (SWF)
SDK)</p>
<p><span style='font-family:Tahoma;mso-bidi-font-family:"Times New Roman"'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></p>
<table border=1 cellspacing=0 cellpadding=0 style='margin-left:17.7pt;
border-collapse:collapse;border:none;mso-border-alt:solid navy .75pt;
mso-padding-alt:0in 4.2pt 0in 4.2pt'>
<tr>
<td width=564 colspan=3 valign=top style='width:422.7pt;border:solid navy .75pt;
background:navy;mso-shading:white;mso-pattern:solid navy;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><b><span style='font-family:Tahoma;mso-bidi-font-family:
"Times New Roman";color:white'>DefineBitsJPEG 2<o:p></o:p></span></b></p>
</td>
</tr>
<tr>
<td width=171 valign=top style='width:128.3pt;border:solid navy .75pt;
border-top:none;mso-border-top-alt:solid navy .75pt;background:white;
padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><b><span style='color:windowtext'>Field</span></b><b><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></b></p>
</td>
<td width=195 valign=top style='width:146.1pt;border-top:none;border-left:
none;border-bottom:solid navy .75pt;border-right:solid navy .75pt;mso-border-top-alt:
solid navy .75pt;mso-border-left-alt:solid navy .75pt;background:white;
padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><b><span style='color:windowtext'>Type</span></b><b><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></b></p>
</td>
<td width=198 valign=top style='width:148.3pt;border-top:none;border-left:
none;border-bottom:solid navy .75pt;border-right:solid navy .75pt;mso-border-top-alt:
solid navy .75pt;mso-border-left-alt:solid navy .75pt;background:white;
padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><b><span style='color:windowtext'>Comment</span></b><b><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></b></p>
</td>
</tr>
<tr>
<td width=171 valign=top style='width:128.3pt;border:solid navy .75pt;
border-top:none;mso-border-top-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>Header</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
<td width=195 valign=top style='width:146.1pt;border-top:none;border-left:
none;border-bottom:solid navy .75pt;border-right:solid navy .75pt;mso-border-top-alt:
solid navy .75pt;mso-border-left-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>RECORDHEADER</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
<td width=198 valign=top style='width:148.3pt;border-top:none;border-left:
none;border-bottom:solid navy .75pt;border-right:solid navy .75pt;mso-border-top-alt:
solid navy .75pt;mso-border-left-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>Tag ID = 21</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width=171 valign=top style='width:128.3pt;border:solid navy .75pt;
border-top:none;mso-border-top-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>BitmapId</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
<td width=195 valign=top style='width:146.1pt;border-top:none;border-left:
none;border-bottom:solid navy .75pt;border-right:solid navy .75pt;mso-border-top-alt:
solid navy .75pt;mso-border-left-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>UI16</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
<td width=198 valign=top style='width:148.3pt;border-top:none;border-left:
none;border-bottom:solid navy .75pt;border-right:solid navy .75pt;mso-border-top-alt:
solid navy .75pt;mso-border-left-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>ID for this character</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width=171 valign=top style='width:128.3pt;border:solid navy .75pt;
border-top:none;mso-border-top-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>BitmapJPEGEncoding</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
<td width=195 valign=top style='width:146.1pt;border-top:none;border-left:
none;border-bottom:solid navy .75pt;border-right:solid navy .75pt;mso-border-top-alt:
solid navy .75pt;mso-border-left-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>UI8[encoding data size]</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
<td width=198 valign=top style='width:148.3pt;border-top:none;border-left:
none;border-bottom:solid navy .75pt;border-right:solid navy .75pt;mso-border-top-alt:
solid navy .75pt;mso-border-left-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>JPEG encoding table</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
</tr>
<tr>
<td width=171 valign=top style='width:128.3pt;border:solid navy .75pt;
border-top:none;mso-border-top-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>BitmapJPEGImage</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
<td width=195 valign=top style='width:146.1pt;border-top:none;border-left:
none;border-bottom:solid navy .75pt;border-right:solid navy .75pt;mso-border-top-alt:
solid navy .75pt;mso-border-left-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>UI8[image data size]</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
<td width=198 valign=top style='width:148.3pt;border-top:none;border-left:
none;border-bottom:solid navy .75pt;border-right:solid navy .75pt;mso-border-top-alt:
solid navy .75pt;mso-border-left-alt:solid navy .75pt;padding:0in 4.2pt 0in 4.2pt'>
<p class=MsoNormal><span style='color:windowtext'>JPEG compressed image</span><span
style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p>
</td>
</tr>
</table>
<h4><a name="_Toc497742455"></a><a name=h4DefineBitsJPEG3></a><span
style='mso-bookmark:_Toc497742455'>DefineBitsJPEG3</span></h4>
<p>Defines a bitmap character with JPEG compression. This tag differs from
DefineBitsJPEG2 because it contains alpha channel data. This record allows
multiple JPEG images with differing compression ratios to be defined within a
single SWF file. </p>
<p>Note: The JPEG encoding data and image data contained within this record are
in two separate JPEG streams. Each JPEG stream has a beginning of stream tag
(0xFF, 0xD8) and an end of stream tag (0xFF, 0xD9). This differs from a
standard JPEG image which combines the encoding data and image data into a
single stream. (Macromedia Flash (SWF) 3) </p>
<p><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
<p>(See class <a
href="..\..\Micro⌨️ 快捷键说明
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