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<title>Graphics/Gloss/Internals/Render/Bitmap.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# OPTIONS -fwarn-incomplete-patterns #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>-- | Helper functions for rendering bitmaps</span>
<a name="line-4"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Render</span><span class='hs-varop'>.</span><span class='hs-conid'>Bitmap</span>
<a name="line-5"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>BitmapData</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-6"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>reverseRGBA</span>
<a name="line-7"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>bitmapPath</span>
<a name="line-8"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>freeBitmapData</span>
<a name="line-9"></a> <span class='hs-layout'>)</span>
<a name="line-10"></a><span class='hs-keyword'>where</span>
<a name="line-11"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span>
<a name="line-12"></a>
<a name="line-13"></a>
<a name="line-14"></a><a name="BitmapData"></a><span class='hs-comment'>-- | Abstract 32-bit RGBA bitmap data.</span>
<a name="line-15"></a><a name="BitmapData"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>BitmapData</span>
<a name="line-16"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BitmapData</span>
<a name="line-17"></a> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- length (in bytes)</span>
<a name="line-18"></a> <span class='hs-layout'>(</span><span class='hs-conid'>ForeignPtr</span> <span class='hs-conid'>Word8</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- pointer to data</span>
<a name="line-19"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>)</span>
<a name="line-20"></a>
<a name="line-21"></a>
<a name="line-22"></a><a name="instance%20Show%20BitmapData"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Show</span> <span class='hs-conid'>BitmapData</span> <span class='hs-keyword'>where</span>
<a name="line-23"></a> <span class='hs-varid'>show</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"BitmapData"</span>
<a name="line-24"></a>
<a name="line-25"></a>
<a name="line-26"></a><a name="bitmapPath"></a><span class='hs-comment'>-- | Generates the point path to display the bitmap centred</span>
<a name="line-27"></a><span class='hs-definition'>bitmapPath</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Float</span><span class='hs-layout'>,</span> <span class='hs-conid'>Float</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-28"></a><span class='hs-definition'>bitmapPath</span> <span class='hs-varid'>width</span> <span class='hs-varid'>height</span>
<a name="line-29"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-varid'>width'</span><span class='hs-layout'>,</span> <span class='hs-comment'>-</span><span class='hs-varid'>height'</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>width'</span><span class='hs-layout'>,</span> <span class='hs-comment'>-</span><span class='hs-varid'>height'</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>width'</span><span class='hs-layout'>,</span> <span class='hs-varid'>height'</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-varid'>width'</span><span class='hs-layout'>,</span> <span class='hs-varid'>height'</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-30"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>width'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>width</span> <span class='hs-varop'>/</span> <span class='hs-num'>2</span>
<a name="line-31"></a> <span class='hs-varid'>height'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>height</span> <span class='hs-varop'>/</span> <span class='hs-num'>2</span>
<a name="line-32"></a>
<a name="line-33"></a>
<a name="line-34"></a><a name="reverseRGBA"></a><span class='hs-comment'>-- | Destructively reverse the byte order in an array.</span>
<a name="line-35"></a><span class='hs-comment'>-- This is necessary as OpenGL reads pixel data as ABGR, rather than RGBA</span>
<a name="line-36"></a><span class='hs-definition'>reverseRGBA</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BitmapData</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-37"></a><span class='hs-definition'>reverseRGBA</span> <span class='hs-layout'>(</span><span class='hs-conid'>BitmapData</span> <span class='hs-varid'>length8</span> <span class='hs-varid'>fptr</span><span class='hs-layout'>)</span>
<a name="line-38"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withForeignPtr</span> <span class='hs-varid'>fptr</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverseRGBA_ptr</span> <span class='hs-varid'>length8</span><span class='hs-layout'>)</span>
<a name="line-39"></a>
<a name="line-40"></a>
<a name="line-41"></a><a name="reverseRGBA_ptr"></a><span class='hs-comment'>-- | Destructively reverses the byte order in an array.</span>
<a name="line-42"></a><span class='hs-definition'>reverseRGBA_ptr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>Word8</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-43"></a><span class='hs-definition'>reverseRGBA_ptr</span> <span class='hs-varid'>length8</span> <span class='hs-varid'>ptr8</span>
<a name="line-44"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-varid'>length8</span> <span class='hs-varop'>`div`</span> <span class='hs-num'>4</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>castPtr</span> <span class='hs-varid'>ptr8</span><span class='hs-layout'>)</span> <span class='hs-num'>0</span>
<a name="line-45"></a> <span class='hs-keyword'>where</span>
<a name="line-46"></a> <span class='hs-varid'>go</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>Word32</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-47"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>len</span> <span class='hs-varid'>ptr</span> <span class='hs-varid'>count</span>
<a name="line-48"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>count</span> <span class='hs-varop'><</span> <span class='hs-varid'>len</span>
<a name="line-49"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>curr</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>peekElemOff</span> <span class='hs-varid'>ptr</span> <span class='hs-varid'>count</span>
<a name="line-50"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>byte0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>shift</span> <span class='hs-layout'>(</span><span class='hs-varid'>isolateByte0</span> <span class='hs-varid'>curr</span><span class='hs-layout'>)</span> <span class='hs-num'>24</span>
<a name="line-51"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>byte1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>shift</span> <span class='hs-layout'>(</span><span class='hs-varid'>isolateByte1</span> <span class='hs-varid'>curr</span><span class='hs-layout'>)</span> <span class='hs-num'>8</span>
<a name="line-52"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>byte2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>shift</span> <span class='hs-layout'>(</span><span class='hs-varid'>isolateByte2</span> <span class='hs-varid'>curr</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>8</span><span class='hs-layout'>)</span>
<a name="line-53"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>byte3</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>shift</span> <span class='hs-layout'>(</span><span class='hs-varid'>isolateByte3</span> <span class='hs-varid'>curr</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>24</span><span class='hs-layout'>)</span>
<a name="line-54"></a> <span class='hs-varid'>pokeElemOff</span> <span class='hs-varid'>ptr</span> <span class='hs-varid'>count</span> <span class='hs-layout'>(</span><span class='hs-varid'>byte0</span> <span class='hs-varop'>.|.</span> <span class='hs-varid'>byte1</span> <span class='hs-varop'>.|.</span> <span class='hs-varid'>byte2</span> <span class='hs-varop'>.|.</span> <span class='hs-varid'>byte3</span><span class='hs-layout'>)</span>
<a name="line-55"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>len</span> <span class='hs-varid'>ptr</span> <span class='hs-layout'>(</span><span class='hs-varid'>count</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-56"></a>
<a name="line-57"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span>
<a name="line-58"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-59"></a>
<a name="line-60"></a><a name="freeBitmapData"></a><span class='hs-comment'>-- | Frees the allocated memory given to OpenGL to avoid a memory leak</span>
<a name="line-61"></a><span class='hs-definition'>freeBitmapData</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>Word8</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-62"></a><span class='hs-comment'>{-# INLINE freeBitmapData #-}</span>
<a name="line-63"></a><span class='hs-definition'>freeBitmapData</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>free</span> <span class='hs-varid'>p</span>
<a name="line-64"></a>
<a name="line-65"></a>
<a name="line-66"></a><a name="isolateByte0"></a><span class='hs-comment'>-- | These functions work as bit masks to isolate the Word8 components</span>
<a name="line-67"></a><span class='hs-comment'>{-# INLINE isolateByte0 #-}</span>
<a name="line-68"></a><span class='hs-definition'>isolateByte0</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word32</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Word32</span>
<a name="line-69"></a><span class='hs-definition'>isolateByte0</span> <span class='hs-varid'>word</span> <span class='hs-keyglyph'>=</span>
<a name="line-70"></a> <span class='hs-varid'>word</span> <span class='hs-varop'>.&.</span> <span class='hs-layout'>(</span><span class='hs-num'>255</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word32</span><span class='hs-layout'>)</span>
<a name="line-71"></a>
<a name="line-72"></a><a name="isolateByte1"></a><span class='hs-comment'>{-# INLINE isolateByte1 #-}</span>
<a name="line-73"></a><span class='hs-definition'>isolateByte1</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word32</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Word32</span>
<a name="line-74"></a><span class='hs-definition'>isolateByte1</span> <span class='hs-varid'>word</span> <span class='hs-keyglyph'>=</span>
<a name="line-75"></a> <span class='hs-varid'>word</span> <span class='hs-varop'>.&.</span> <span class='hs-layout'>(</span><span class='hs-num'>65280</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word32</span><span class='hs-layout'>)</span>
<a name="line-76"></a>
<a name="line-77"></a><a name="isolateByte2"></a><span class='hs-comment'>{-# INLINE isolateByte2 #-}</span>
<a name="line-78"></a><span class='hs-definition'>isolateByte2</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word32</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Word32</span>
<a name="line-79"></a><span class='hs-definition'>isolateByte2</span> <span class='hs-varid'>word</span> <span class='hs-keyglyph'>=</span>
<a name="line-80"></a> <span class='hs-varid'>word</span> <span class='hs-varop'>.&.</span> <span class='hs-layout'>(</span><span class='hs-num'>16711680</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word32</span><span class='hs-layout'>)</span>
<a name="line-81"></a>
<a name="line-82"></a><a name="isolateByte3"></a><span class='hs-comment'>{-# INLINE isolateByte3 #-}</span>
<a name="line-83"></a><span class='hs-definition'>isolateByte3</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word32</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Word32</span>
<a name="line-84"></a><span class='hs-definition'>isolateByte3</span> <span class='hs-varid'>word</span> <span class='hs-keyglyph'>=</span>
<a name="line-85"></a> <span class='hs-varid'>word</span> <span class='hs-varop'>.&.</span> <span class='hs-layout'>(</span><span class='hs-num'>4278190080</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word32</span><span class='hs-layout'>)</span>
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