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  4. >SDL_Overlay</TITLE
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  10. TITLE="SDL Library Documentation"
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  13. TITLE="Video"
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  16. TITLE="SDL_VideoInfo"
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  39. >SDL Library Documentation</TH
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  47. HREF="sdlvideoinfo.html"
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  66. ALIGN="LEFT"
  67. WIDTH="100%"></DIV
  68. ><H1
  69. ><A
  70. NAME="SDLOVERLAY"
  71. >SDL_Overlay</A
  72. ></H1
  73. ><DIV
  74. CLASS="REFNAMEDIV"
  75. ><A
  76. NAME="AEN3042"
  77. ></A
  78. ><H2
  79. >Name</H2
  80. >SDL_Overlay&nbsp;--&nbsp;YUV video overlay</DIV
  81. ><DIV
  82. CLASS="REFSECT1"
  83. ><A
  84. NAME="AEN3045"
  85. ></A
  86. ><H2
  87. >Structure Definition</H2
  88. ><PRE
  89. CLASS="PROGRAMLISTING"
  90. >typedef struct{
  91.   Uint32 format;
  92.   int w, h;
  93.   int planes;
  94.   Uint16 *pitches;
  95.   Uint8 **pixels;
  96.   Uint32 hw_overlay:1;
  97. } SDL_Overlay;</PRE
  98. ></DIV
  99. ><DIV
  100. CLASS="REFSECT1"
  101. ><A
  102. NAME="AEN3048"
  103. ></A
  104. ><H2
  105. >Structure Data</H2
  106. ><DIV
  107. CLASS="INFORMALTABLE"
  108. ><A
  109. NAME="AEN3050"
  110. ></A
  111. ><P
  112. ></P
  113. ><TABLE
  114. BORDER="0"
  115. CLASS="CALSTABLE"
  116. ><TBODY
  117. ><TR
  118. ><TD
  119. ALIGN="LEFT"
  120. VALIGN="TOP"
  121. ><TT
  122. CLASS="STRUCTFIELD"
  123. ><I
  124. >format</I
  125. ></TT
  126. ></TD
  127. ><TD
  128. ALIGN="LEFT"
  129. VALIGN="TOP"
  130. >Overlay format (see below)</TD
  131. ></TR
  132. ><TR
  133. ><TD
  134. ALIGN="LEFT"
  135. VALIGN="TOP"
  136. ><TT
  137. CLASS="STRUCTFIELD"
  138. ><I
  139. >w, h</I
  140. ></TT
  141. ></TD
  142. ><TD
  143. ALIGN="LEFT"
  144. VALIGN="TOP"
  145. >Width and height of overlay</TD
  146. ></TR
  147. ><TR
  148. ><TD
  149. ALIGN="LEFT"
  150. VALIGN="TOP"
  151. ><TT
  152. CLASS="STRUCTFIELD"
  153. ><I
  154. >planes</I
  155. ></TT
  156. ></TD
  157. ><TD
  158. ALIGN="LEFT"
  159. VALIGN="TOP"
  160. >Number of planes in the overlay. Usually either 1 or 3</TD
  161. ></TR
  162. ><TR
  163. ><TD
  164. ALIGN="LEFT"
  165. VALIGN="TOP"
  166. ><TT
  167. CLASS="STRUCTFIELD"
  168. ><I
  169. >pitches</I
  170. ></TT
  171. ></TD
  172. ><TD
  173. ALIGN="LEFT"
  174. VALIGN="TOP"
  175. >An array of pitches, one for each plane. Pitch is the length of a row in bytes.</TD
  176. ></TR
  177. ><TR
  178. ><TD
  179. ALIGN="LEFT"
  180. VALIGN="TOP"
  181. ><TT
  182. CLASS="STRUCTFIELD"
  183. ><I
  184. >pixels</I
  185. ></TT
  186. ></TD
  187. ><TD
  188. ALIGN="LEFT"
  189. VALIGN="TOP"
  190. >An array of pointers to teh data of each plane. The overlay should be locked before these pointers are used.</TD
  191. ></TR
  192. ><TR
  193. ><TD
  194. ALIGN="LEFT"
  195. VALIGN="TOP"
  196. ><TT
  197. CLASS="STRUCTFIELD"
  198. ><I
  199. >hw_overlay</I
  200. ></TT
  201. ></TD
  202. ><TD
  203. ALIGN="LEFT"
  204. VALIGN="TOP"
  205. >This will be set to 1 if the overlay is hardware accelerated.</TD
  206. ></TR
  207. ></TBODY
  208. ></TABLE
  209. ><P
  210. ></P
  211. ></DIV
  212. ></DIV
  213. ><DIV
  214. CLASS="REFSECT1"
  215. ><A
  216. NAME="AEN3077"
  217. ></A
  218. ><H2
  219. >Description</H2
  220. ><P
  221. >A <SPAN
  222. CLASS="STRUCTNAME"
  223. >SDL_Overlay</SPAN
  224. > is similar to a <A
  225. HREF="sdlsurface.html"
  226. ><SPAN
  227. CLASS="STRUCTNAME"
  228. >SDL_Surface</SPAN
  229. ></A
  230. > except it stores a YUV overlay. All the fields are read only, except for <TT
  231. CLASS="STRUCTFIELD"
  232. ><I
  233. >pixels</I
  234. ></TT
  235. > which should be <A
  236. HREF="sdllockyuvoverlay.html"
  237. >locked</A
  238. > before use. The <TT
  239. CLASS="STRUCTFIELD"
  240. ><I
  241. >format</I
  242. ></TT
  243. > field stores the format of the overlay which is one of the following:
  244. <PRE
  245. CLASS="PROGRAMLISTING"
  246. >#define SDL_YV12_OVERLAY  0x32315659  /* Planar mode: Y + V + U */
  247. #define SDL_IYUV_OVERLAY  0x56555949  /* Planar mode: Y + U + V */
  248. #define SDL_YUY2_OVERLAY  0x32595559  /* Packed mode: Y0+U0+Y1+V0 */
  249. #define SDL_UYVY_OVERLAY  0x59565955  /* Packed mode: U0+Y0+V0+Y1 */
  250. #define SDL_YVYU_OVERLAY  0x55595659  /* Packed mode: Y0+V0+Y1+U0 */</PRE
  251. >
  252. More information on YUV formats can be found at <A
  253. HREF="http://www.webartz.com/fourcc/indexyuv.htm"
  254. TARGET="_top"
  255. >http://www.webartz.com/fourcc/indexyuv.htm</A
  256. >.</P
  257. ></DIV
  258. ><DIV
  259. CLASS="REFSECT1"
  260. ><A
  261. NAME="AEN3088"
  262. ></A
  263. ><H2
  264. >See Also</H2
  265. ><P
  266. ><A
  267. HREF="sdlcreateyuvoverlay.html"
  268. ><TT
  269. CLASS="FUNCTION"
  270. >SDL_CreateYUVOverlay</TT
  271. ></A
  272. >,
  273. <A
  274. HREF="sdllockyuvoverlay.html"
  275. ><TT
  276. CLASS="FUNCTION"
  277. >SDL_LockYUVOverlay</TT
  278. ></A
  279. >,
  280. <A
  281. HREF="sdlunlockyuvoverlay.html"
  282. ><TT
  283. CLASS="FUNCTION"
  284. >SDL_UnlockYUVOverlay</TT
  285. ></A
  286. >,
  287. <A
  288. HREF="sdlfreeyuvoverlay.html"
  289. ><TT
  290. CLASS="FUNCTION"
  291. >SDL_FreeYUVOverlay</TT
  292. ></A
  293. ></P
  294. ></DIV
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