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<h1>SDL_gfxBlitFunc.h</h1><a href="_s_d_l__gfx_blit_func_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* </span>
<a name="l00002"></a>00002 <span class="comment"></span>
<a name="l00003"></a>00003 <span class="comment">SDL_gfxBlitFunc: custom blitters (part of SDL_gfx library)</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment">LGPL (c) A. Schiffler</span>
<a name="l00006"></a>00006 <span class="comment"></span>
<a name="l00007"></a>00007 <span class="comment">*/</span>
<a name="l00008"></a>00008
<a name="l00009"></a>00009 <span class="preprocessor">#ifndef _SDL_gfxBlitFunc_h</span>
<a name="l00010"></a>00010 <span class="preprocessor"></span><span class="preprocessor">#define _SDL_gfxBlitFunc_h</span>
<a name="l00011"></a>00011 <span class="preprocessor"></span>
<a name="l00012"></a>00012 <span class="comment">/* Set up for C function definitions, even when using C++ */</span>
<a name="l00013"></a>00013 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00014"></a>00014 <span class="preprocessor"></span><span class="keyword">extern</span> <span class="stringliteral">"C"</span> {
<a name="l00015"></a>00015 <span class="preprocessor">#endif</span>
<a name="l00016"></a>00016 <span class="preprocessor"></span>
<a name="l00017"></a>00017 <span class="preprocessor">#include <stdio.h></span>
<a name="l00018"></a>00018 <span class="preprocessor">#include <stdlib.h></span>
<a name="l00019"></a>00019
<a name="l00020"></a>00020 <span class="preprocessor">#include <SDL.h></span>
<a name="l00021"></a>00021 <span class="preprocessor">#include <SDL_video.h></span>
<a name="l00022"></a>00022
<a name="l00023"></a>00023 <span class="comment">/* ---- Function Prototypes */</span>
<a name="l00024"></a>00024
<a name="l00025"></a>00025 <span class="preprocessor">#if defined(WIN32) || defined(WIN64)</span>
<a name="l00026"></a>00026 <span class="preprocessor"></span><span class="preprocessor"># if defined(DLL_EXPORT) && !defined(LIBSDL_GFX_DLL_IMPORT)</span>
<a name="l00027"></a>00027 <span class="preprocessor"></span><span class="preprocessor"># define SDL_GFXBLITFUNC_SCOPE __declspec(dllexport)</span>
<a name="l00028"></a>00028 <span class="preprocessor"></span><span class="preprocessor"># else</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span><span class="preprocessor"># ifdef LIBSDL_GFX_DLL_IMPORT</span>
<a name="l00030"></a>00030 <span class="preprocessor"></span><span class="preprocessor"># define SDL_GFXBLITFUNC_SCOPE __declspec(dllimport)</span>
<a name="l00031"></a>00031 <span class="preprocessor"></span><span class="preprocessor"># endif</span>
<a name="l00032"></a>00032 <span class="preprocessor"></span><span class="preprocessor"># endif</span>
<a name="l00033"></a>00033 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00034"></a>00034 <span class="preprocessor"></span><span class="preprocessor">#ifndef SDL_GFXBLITFUNC_SCOPE</span>
<a name="l00035"></a>00035 <span class="preprocessor"></span><span class="preprocessor"># define SDL_GFXBLITFUNC_SCOPE extern</span>
<a name="l00036"></a>00036 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00037"></a>00037 <span class="preprocessor"></span>
<a name="l00038"></a>00038
<a name="l00039"></a>00039 SDL_GFXBLITFUNC_SCOPE <span class="keywordtype">int</span> <a class="code" href="_s_d_l__gfx_blit_func_8c.html#ac51ff40d39f3dd0bd08116e8953960f8" title="Blitter for RGBA-&gt;RGBA blits with alpha adjustment.">SDL_gfxBlitRGBA</a>(SDL_Surface * src, SDL_Rect * srcrect, SDL_Surface * dst, SDL_Rect * dstrect);
<a name="l00040"></a>00040
<a name="l00041"></a>00041 SDL_GFXBLITFUNC_SCOPE <span class="keywordtype">int</span> <a class="code" href="_s_d_l__gfx_blit_func_8c.html#a09a376775f9d8c933c7121e34fe5ecfc" title="Sets the alpha channel in a 32 bit surface.">SDL_gfxSetAlpha</a>(SDL_Surface * src, Uint8 a);
<a name="l00042"></a>00042
<a name="l00043"></a>00043 SDL_GFXBLITFUNC_SCOPE <span class="keywordtype">int</span> <a class="code" href="_s_d_l__gfx_blit_func_8c.html#a4ece530dca0ae46b1f5a780f85371687" title="Multiply the alpha channel in a 32bit surface.">SDL_gfxMultiplyAlpha</a>(SDL_Surface * src, Uint8 a);
<a name="l00044"></a>00044
<a name="l00045"></a>00045 <span class="comment">/* -------- Macros */</span>
<a name="l00046"></a>00046
<a name="l00047"></a>00047 <span class="comment">/* Define SDL macros locally as a substitute for an #include "SDL_blit.h", */</span>
<a name="l00048"></a>00048 <span class="comment">/* which doesn't work since the include file doesn't get installed. */</span>
<a name="l00049"></a>00049
<a name="l00053"></a><a class="code" href="struct_s_d_l__gfx_blit_info.html">00053</a> <span class="keyword">typedef</span> <span class="keyword">struct </span>{
<a name="l00054"></a><a class="code" href="struct_s_d_l__gfx_blit_info.html#a03dd1de15b100cd491eff7d823284189">00054</a> Uint8 *s_pixels;
<a name="l00055"></a><a class="code" href="struct_s_d_l__gfx_blit_info.html#ad2f7fa9a764e75639fdb6e3b0f8a68fc">00055</a> <span class="keywordtype">int</span> s_width;
<a name="l00056"></a><a class="code" href="struct_s_d_l__gfx_blit_info.html#aeeec65f001e54fb93ba97cb85cb61592">00056</a> <span class="keywordtype">int</span> s_height;
<a name="l00057"></a><a class="code" href="struct_s_d_l__gfx_blit_info.html#a25b822e4773e1db6d38aadc5c0bb126f">00057</a> <span class="keywordtype">int</span> s_skip;
<a name="l00058"></a><a class="code" href="struct_s_d_l__gfx_blit_info.html#ae9146d0f8b236274984127a7a1528966">00058</a> Uint8 *d_pixels;
<a name="l00059"></a><a class="code" href="struct_s_d_l__gfx_blit_info.html#ad49412925c79a9894ea598530ea39b00">00059</a> <span class="keywordtype">int</span> d_width;
<a name="l00060"></a><a class="code" href="struct_s_d_l__gfx_blit_info.html#ad31494204fdd3d2cb30faba527cfb9fa">00060</a> <span class="keywordtype">int</span> d_height;
<a name="l00061"></a><a class="code" href="struct_s_d_l__gfx_blit_info.html#a9055858de99c49d16ef903fed31715b7">00061</a> <span class="keywordtype">int</span> d_skip;
<a name="l00062"></a><a class="code" href="struct_s_d_l__gfx_blit_info.html#a4b938ad61daa0a9625c6892fd46f32a2">00062</a> <span class="keywordtype">void</span> *aux_data;
<a name="l00063"></a><a class="code" href="struct_s_d_l__gfx_blit_info.html#a1ce90142d08a06fede5e2a13d66d17f6">00063</a> SDL_PixelFormat *src;
<a name="l00064"></a><a class="code" href="struct_s_d_l__gfx_blit_info.html#a9596f5ea6998964e6240fae7ac17ce1e">00064</a> Uint8 *table;
<a name="l00065"></a><a class="code" href="struct_s_d_l__gfx_blit_info.html#a177d476cb937246853b74253490436db">00065</a> SDL_PixelFormat *dst;
<a name="l00066"></a>00066 } <a class="code" href="struct_s_d_l__gfx_blit_info.html" title="The structure passed to the low level blit functions.">SDL_gfxBlitInfo</a>;
<a name="l00067"></a>00067
<a name="l00071"></a><a class="code" href="_s_d_l__gfx_blit_func_8h.html#ae6b2c815be86ad92310efb40d4b0b30e">00071</a> <span class="preprocessor">#define GFX_RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a) \</span>
<a name="l00072"></a>00072 <span class="preprocessor"> { \</span>
<a name="l00073"></a>00073 <span class="preprocessor"> r = ((pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; \</span>
<a name="l00074"></a>00074 <span class="preprocessor"> g = ((pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; \</span>
<a name="l00075"></a>00075 <span class="preprocessor"> b = ((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; \</span>
<a name="l00076"></a>00076 <span class="preprocessor"> a = ((pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss; \</span>
<a name="l00077"></a>00077 <span class="preprocessor"> }</span>
<a name="l00078"></a>00078 <span class="preprocessor"></span>
<a name="l00082"></a><a class="code" href="_s_d_l__gfx_blit_func_8h.html#a874180f742c36ca537c247036f05c182">00082</a> <span class="preprocessor">#define GFX_DISEMBLE_RGBA(buf, bpp, fmt, pixel, r, g, b, a) \</span>
<a name="l00083"></a>00083 <span class="preprocessor"> do { \</span>
<a name="l00084"></a>00084 <span class="preprocessor"> pixel = *((Uint32 *)(buf)); \</span>
<a name="l00085"></a>00085 <span class="preprocessor"> GFX_RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a); \</span>
<a name="l00086"></a>00086 <span class="preprocessor"> pixel &= ~fmt->Amask; \</span>
<a name="l00087"></a>00087 <span class="preprocessor"> } while(0)</span>
<a name="l00088"></a>00088 <span class="preprocessor"></span>
<a name="l00092"></a><a class="code" href="_s_d_l__gfx_blit_func_8h.html#a64927ca5690904716f7ac93b1fcd4420">00092</a> <span class="preprocessor">#define GFX_PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a) \</span>
<a name="l00093"></a>00093 <span class="preprocessor"> { \</span>
<a name="l00094"></a>00094 <span class="preprocessor"> pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \</span>
<a name="l00095"></a>00095 <span class="preprocessor"> ((g>>fmt->Gloss)<<fmt->Gshift)| \</span>
<a name="l00096"></a>00096 <span class="preprocessor"> ((b>>fmt->Bloss)<<fmt->Bshift)| \</span>
<a name="l00097"></a>00097 <span class="preprocessor"> ((a<<fmt->Aloss)<<fmt->Ashift); \</span>
<a name="l00098"></a>00098 <span class="preprocessor"> }</span>
<a name="l00099"></a>00099 <span class="preprocessor"></span>
<a name="l00103"></a><a class="code" href="_s_d_l__gfx_blit_func_8h.html#a4e59f926fb98a86c01a4ffc5cc20e8d5">00103</a> <span class="preprocessor">#define GFX_ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \</span>
<a name="l00104"></a>00104 <span class="preprocessor"> { \</span>
<a name="l00105"></a>00105 <span class="preprocessor"> Uint32 pixel; \</span>
<a name="l00106"></a>00106 <span class="preprocessor"> \</span>
<a name="l00107"></a>00107 <span class="preprocessor"> GFX_PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a); \</span>
<a name="l00108"></a>00108 <span class="preprocessor"> *((Uint32 *)(buf)) = pixel; \</span>
<a name="l00109"></a>00109 <span class="preprocessor"> }</span>
<a name="l00110"></a>00110 <span class="preprocessor"></span>
<a name="l00114"></a><a class="code" href="_s_d_l__gfx_blit_func_8h.html#ae3efb9e67172838c394c148a62822da6">00114</a> <span class="preprocessor">#define GFX_ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \</span>
<a name="l00115"></a>00115 <span class="preprocessor"> do { \</span>
<a name="l00116"></a>00116 <span class="preprocessor"> dR = (((sR-dR)*(A))/255)+dR; \</span>
<a name="l00117"></a>00117 <span class="preprocessor"> dG = (((sG-dG)*(A))/255)+dG; \</span>
<a name="l00118"></a>00118 <span class="preprocessor"> dB = (((sB-dB)*(A))/255)+dB; \</span>
<a name="l00119"></a>00119 <span class="preprocessor"> } while(0)</span>
<a name="l00120"></a>00120 <span class="preprocessor"></span>
<a name="l00126"></a><a class="code" href="_s_d_l__gfx_blit_func_8h.html#a44c498dca765a515f40eecad8f19aac4">00126</a> <span class="preprocessor">#define GFX_DUFFS_LOOP4(pixel_copy_increment, width) \</span>
<a name="l00127"></a>00127 <span class="preprocessor"> { int n = (width+3)/4; \</span>
<a name="l00128"></a>00128 <span class="preprocessor"> switch (width & 3) { \</span>
<a name="l00129"></a>00129 <span class="preprocessor"> case 0: do { pixel_copy_increment; \</span>
<a name="l00130"></a>00130 <span class="preprocessor"> case 3: pixel_copy_increment; \</span>
<a name="l00131"></a>00131 <span class="preprocessor"> case 2: pixel_copy_increment; \</span>
<a name="l00132"></a>00132 <span class="preprocessor"> case 1: pixel_copy_increment; \</span>
<a name="l00133"></a>00133 <span class="preprocessor"> } while ( --n > 0 ); \</span>
<a name="l00134"></a>00134 <span class="preprocessor"> } \</span>
<a name="l00135"></a>00135 <span class="preprocessor"> }</span>
<a name="l00136"></a>00136 <span class="preprocessor"></span>
<a name="l00137"></a>00137
<a name="l00138"></a>00138
<a name="l00139"></a>00139 <span class="comment">/* Ends C function definitions when using C++ */</span>
<a name="l00140"></a>00140 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00141"></a>00141 <span class="preprocessor"></span>}
<a name="l00142"></a>00142 <span class="preprocessor">#endif</span>
<a name="l00143"></a>00143 <span class="preprocessor"></span>
<a name="l00144"></a>00144 <span class="preprocessor">#endif </span><span class="comment">/* _SDL_gfxBlitFunc_h */</span>
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