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<title>Codec/BMP/Compression.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# OPTIONS_HADDOCK hide #-}</span>
<a name="line-2"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Codec</span><span class='hs-varop'>.</span><span class='hs-conid'>BMP</span><span class='hs-varop'>.</span><span class='hs-conid'>Compression</span>
<a name="line-3"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Compression</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-4"></a><span class='hs-keyword'>where</span>
<a name="line-5"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Word</span>
<a name="line-6"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Binary</span>
<a name="line-7"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Binary</span><span class='hs-varop'>.</span><span class='hs-conid'>Get</span>
<a name="line-8"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Binary</span><span class='hs-varop'>.</span><span class='hs-conid'>Put</span>
<a name="line-9"></a>
<a name="line-10"></a>
<a name="line-11"></a><a name="Compression"></a><span class='hs-comment'>-- | The Compression mode says how the image data is encoded in the file.</span>
<a name="line-12"></a><a name="Compression"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Compression</span>
<a name="line-13"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CompressionRGB</span>
<a name="line-14"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>CompressionRLE8</span>
<a name="line-15"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>CompressionRLE4</span>
<a name="line-16"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>CompressionBitFields</span>
<a name="line-17"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>CompressionJPEG</span>
<a name="line-18"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>CompressionPNG</span>
<a name="line-19"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>CompressionUnknown</span> <span class='hs-conid'>Word32</span>
<a name="line-20"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>)</span>
<a name="line-21"></a>
<a name="line-22"></a>
<a name="line-23"></a><a name="instance%20Binary%20Compression"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Binary</span> <span class='hs-conid'>Compression</span> <span class='hs-keyword'>where</span>
<a name="line-24"></a> <span class='hs-varid'>get</span>
<a name="line-25"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getWord32le</span>
<a name="line-26"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>of</span>
<a name="line-27"></a> <span class='hs-num'>0</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>CompressionRGB</span>
<a name="line-28"></a> <span class='hs-num'>1</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>CompressionRLE8</span>
<a name="line-29"></a> <span class='hs-num'>2</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>CompressionRLE4</span>
<a name="line-30"></a> <span class='hs-num'>3</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>CompressionBitFields</span>
<a name="line-31"></a> <span class='hs-num'>4</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>CompressionJPEG</span>
<a name="line-32"></a> <span class='hs-num'>5</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>CompressionPNG</span>
<a name="line-33"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>CompressionUnknown</span> <span class='hs-varid'>c</span>
<a name="line-34"></a>
<a name="line-35"></a> <span class='hs-varid'>put</span> <span class='hs-varid'>c</span>
<a name="line-36"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>of</span>
<a name="line-37"></a> <span class='hs-conid'>CompressionRGB</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>putWord32le</span> <span class='hs-num'>0</span>
<a name="line-38"></a> <span class='hs-conid'>CompressionRLE8</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>putWord32le</span> <span class='hs-num'>1</span>
<a name="line-39"></a> <span class='hs-conid'>CompressionRLE4</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>putWord32le</span> <span class='hs-num'>2</span>
<a name="line-40"></a> <span class='hs-conid'>CompressionBitFields</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>putWord32le</span> <span class='hs-num'>3</span>
<a name="line-41"></a> <span class='hs-conid'>CompressionJPEG</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>putWord32le</span> <span class='hs-num'>4</span>
<a name="line-42"></a> <span class='hs-conid'>CompressionPNG</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>putWord32le</span> <span class='hs-num'>5</span>
<a name="line-43"></a> <span class='hs-conid'>CompressionUnknown</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>putWord32le</span> <span class='hs-varid'>x</span>
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