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<title>Graphics/UI/SDL/Rotozoomer.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : Graphics.UI.SDL.Rotozoomer</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) David Himmelstrup 2005</span>
<a name="line-5"></a><span class='hs-comment'>-- License : BSD-like</span>
<a name="line-6"></a><span class='hs-comment'>--</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer : lemmih@gmail.com</span>
<a name="line-8"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-12"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>UI</span><span class='hs-varop'>.</span><span class='hs-conid'>SDL</span><span class='hs-varop'>.</span><span class='hs-conid'>Rotozoomer</span> <span class='hs-keyword'>where</span>
<a name="line-13"></a>
<a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span>
<a name="line-15"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>C</span>
<a name="line-16"></a>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>UI</span><span class='hs-varop'>.</span><span class='hs-conid'>SDL</span><span class='hs-varop'>.</span><span class='hs-conid'>Video</span>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>UI</span><span class='hs-varop'>.</span><span class='hs-conid'>SDL</span><span class='hs-varop'>.</span><span class='hs-conid'>General</span>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>UI</span><span class='hs-varop'>.</span><span class='hs-conid'>SDL</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span>
<a name="line-20"></a>
<a name="line-21"></a><a name="finalizeWhenNotNull"></a><span class='hs-definition'>finalizeWhenNotNull</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>SurfaceStruct</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Surface</span>
<a name="line-22"></a><span class='hs-definition'>finalizeWhenNotNull</span> <span class='hs-varid'>errMsg</span> <span class='hs-varid'>image</span>
<a name="line-23"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>image</span> <span class='hs-varop'>==</span> <span class='hs-varid'>nullPtr</span>
<a name="line-24"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>failWithError</span> <span class='hs-varid'>errMsg</span>
<a name="line-25"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>mkFinalizedSurface</span> <span class='hs-varid'>image</span>
<a name="line-26"></a>
<a name="line-27"></a>
<a name="line-28"></a>
<a name="line-29"></a><span class='hs-comment'>-- SDL_Surface * rotozoomSurface (SDL_Surface *src, double angle, double zoom, int smooth);</span>
<a name="line-30"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"rotozoomSurface"</span> <span class='hs-varid'>sdlRotozoom</span>
<a name="line-31"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>SurfaceStruct</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Double</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Double</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-layout'>(</span><span class='hs-conid'>Ptr</span> <span class='hs-conid'>SurfaceStruct</span><span class='hs-layout'>)</span>
<a name="line-32"></a><a name="rotozoom"></a><span class='hs-definition'>rotozoom</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Surface</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Double</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Double</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Surface</span>
<a name="line-33"></a><span class='hs-definition'>rotozoom</span> <span class='hs-varid'>src</span> <span class='hs-varid'>angle</span> <span class='hs-varid'>zoom</span> <span class='hs-varid'>smooth</span>
<a name="line-34"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withForeignPtr</span> <span class='hs-varid'>src</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>imgSrc</span> <span class='hs-keyglyph'>-></span>
<a name="line-35"></a> <span class='hs-varid'>sdlRotozoom</span> <span class='hs-varid'>imgSrc</span> <span class='hs-varid'>angle</span> <span class='hs-varid'>zoom</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromBool</span> <span class='hs-varid'>smooth</span><span class='hs-layout'>)</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>finalizeWhenNotNull</span> <span class='hs-str'>"rotozoomSurface"</span>
<a name="line-36"></a>
<a name="line-37"></a><span class='hs-comment'>{-
<a name="line-38"></a>-- SDL_Surface * rotozoomSurfaceXY (SDL_Surface *src, double angle, double zoomx, double zoomy, int smooth);
<a name="line-39"></a>foreign import ccall unsafe "rotozoomSurfaceXY" sdlRotozoomXY
<a name="line-40"></a> :: Ptr SurfaceStruct -> Double -> Double -> Double -> Int -> IO (Ptr SurfaceStruct)
<a name="line-41"></a>rotozoomXY :: Surface -> Double -> Double -> Double -> Bool -> IO Surface
<a name="line-42"></a>rotozoomXY src angle zoomx zoomy smooth
<a name="line-43"></a> = withForeignPtr src $ \imgSrc ->
<a name="line-44"></a> sdlRotozoomXY imgSrc angle zoomx zoomy (fromBool smooth) >>= finalizeWhenNotNull "rotozoomSurfaceXY"
<a name="line-45"></a>-}</span>
<a name="line-46"></a>
<a name="line-47"></a><span class='hs-comment'>-- SDL_Surface * zoomSurface (SDL_Surface *src, double zoomx, double zoomy, int smooth);</span>
<a name="line-48"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"zoomSurface"</span> <span class='hs-varid'>sdlZoom</span>
<a name="line-49"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>SurfaceStruct</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Double</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Double</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-layout'>(</span><span class='hs-conid'>Ptr</span> <span class='hs-conid'>SurfaceStruct</span><span class='hs-layout'>)</span>
<a name="line-50"></a><a name="zoom"></a><span class='hs-definition'>zoom</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Surface</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Double</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Double</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Surface</span>
<a name="line-51"></a><span class='hs-definition'>zoom</span> <span class='hs-varid'>src</span> <span class='hs-varid'>zoomx</span> <span class='hs-varid'>zoomy</span> <span class='hs-varid'>smooth</span>
<a name="line-52"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withForeignPtr</span> <span class='hs-varid'>src</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>imgSrc</span> <span class='hs-keyglyph'>-></span>
<a name="line-53"></a> <span class='hs-varid'>sdlZoom</span> <span class='hs-varid'>imgSrc</span> <span class='hs-varid'>zoomx</span> <span class='hs-varid'>zoomy</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromBool</span> <span class='hs-varid'>smooth</span><span class='hs-layout'>)</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>finalizeWhenNotNull</span> <span class='hs-str'>"zoomSurface"</span>
<a name="line-54"></a>
<a name="line-55"></a>
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