Subversion Repositories Kolibri OS

Rev

Blame | Last modification | View Log | RSS feed

  1. <HTML
  2. ><HEAD
  3. ><TITLE
  4. >SDL_SetGamma</TITLE
  5. ><META
  6. NAME="GENERATOR"
  7. CONTENT="Modular DocBook HTML Stylesheet Version 1.64
  8. "><LINK
  9. REL="HOME"
  10. TITLE="SDL Library Documentation"
  11. HREF="index.html"><LINK
  12. REL="UP"
  13. TITLE="Video"
  14. HREF="video.html"><LINK
  15. REL="PREVIOUS"
  16. TITLE="SDL_SetPalette"
  17. HREF="sdlsetpalette.html"><LINK
  18. REL="NEXT"
  19. TITLE="SDL_GetGammaRamp"
  20. HREF="sdlgetgammaramp.html"></HEAD
  21. ><BODY
  22. CLASS="REFENTRY"
  23. BGCOLOR="#FFF8DC"
  24. TEXT="#000000"
  25. LINK="#0000ee"
  26. VLINK="#551a8b"
  27. ALINK="#ff0000"
  28. ><DIV
  29. CLASS="NAVHEADER"
  30. ><TABLE
  31. WIDTH="100%"
  32. BORDER="0"
  33. CELLPADDING="0"
  34. CELLSPACING="0"
  35. ><TR
  36. ><TH
  37. COLSPAN="3"
  38. ALIGN="center"
  39. >SDL Library Documentation</TH
  40. ></TR
  41. ><TR
  42. ><TD
  43. WIDTH="10%"
  44. ALIGN="left"
  45. VALIGN="bottom"
  46. ><A
  47. HREF="sdlsetpalette.html"
  48. >Prev</A
  49. ></TD
  50. ><TD
  51. WIDTH="80%"
  52. ALIGN="center"
  53. VALIGN="bottom"
  54. ></TD
  55. ><TD
  56. WIDTH="10%"
  57. ALIGN="right"
  58. VALIGN="bottom"
  59. ><A
  60. HREF="sdlgetgammaramp.html"
  61. >Next</A
  62. ></TD
  63. ></TR
  64. ></TABLE
  65. ><HR
  66. ALIGN="LEFT"
  67. WIDTH="100%"></DIV
  68. ><H1
  69. ><A
  70. NAME="SDLSETGAMMA"
  71. >SDL_SetGamma</A
  72. ></H1
  73. ><DIV
  74. CLASS="REFNAMEDIV"
  75. ><A
  76. NAME="AEN1154"
  77. ></A
  78. ><H2
  79. >Name</H2
  80. >SDL_SetGamma&nbsp;--&nbsp;Sets the color gamma function for the display</DIV
  81. ><DIV
  82. CLASS="REFSYNOPSISDIV"
  83. ><A
  84. NAME="AEN1157"
  85. ></A
  86. ><H2
  87. >Synopsis</H2
  88. ><DIV
  89. CLASS="FUNCSYNOPSIS"
  90. ><A
  91. NAME="AEN1158"
  92. ></A
  93. ><P
  94. ></P
  95. ><PRE
  96. CLASS="FUNCSYNOPSISINFO"
  97. >#include "SDL.h"</PRE
  98. ><P
  99. ><CODE
  100. ><CODE
  101. CLASS="FUNCDEF"
  102. >int <B
  103. CLASS="FSFUNC"
  104. >SDL_SetGamma</B
  105. ></CODE
  106. >(float redgamma, float greengamma, float bluegamma);</CODE
  107. ></P
  108. ><P
  109. ></P
  110. ></DIV
  111. ></DIV
  112. ><DIV
  113. CLASS="REFSECT1"
  114. ><A
  115. NAME="AEN1164"
  116. ></A
  117. ><H2
  118. >Description</H2
  119. ><P
  120. >Sets the "gamma function" for the display of each color component.  Gamma
  121. controls the brightness/contrast of colors displayed on the screen.
  122. A gamma value of <TT
  123. CLASS="CONSTANT"
  124. >1.0</TT
  125. > is identity (i.e., no adjustment
  126. is made).</P
  127. ><P
  128. >This function adjusts the gamma based on the "gamma function" parameter,
  129. you can directly specify lookup tables for gamma adjustment with
  130. <A
  131. HREF="sdlsetgammaramp.html"
  132. >SDL_SetGammaRamp</A
  133. >.</P
  134. ><P
  135. >Not all display hardware is able to change gamma.</P
  136. ></DIV
  137. ><DIV
  138. CLASS="REFSECT1"
  139. ><A
  140. NAME="AEN1171"
  141. ></A
  142. ><H2
  143. >Return Value</H2
  144. ><P
  145. >Returns -1 on error (or if gamma adjustment is not supported).</P
  146. ></DIV
  147. ><DIV
  148. CLASS="REFSECT1"
  149. ><A
  150. NAME="AEN1174"
  151. ></A
  152. ><H2
  153. >See Also</H2
  154. ><P
  155. ><A
  156. HREF="sdlgetgammaramp.html"
  157. >SDL_GetGammaRamp</A
  158. >
  159. <A
  160. HREF="sdlsetgammaramp.html"
  161. >SDL_SetGammaRamp</A
  162. ></P
  163. ></DIV
  164. ><DIV
  165. CLASS="NAVFOOTER"
  166. ><HR
  167. ALIGN="LEFT"
  168. WIDTH="100%"><TABLE
  169. WIDTH="100%"
  170. BORDER="0"
  171. CELLPADDING="0"
  172. CELLSPACING="0"
  173. ><TR
  174. ><TD
  175. WIDTH="33%"
  176. ALIGN="left"
  177. VALIGN="top"
  178. ><A
  179. HREF="sdlsetpalette.html"
  180. >Prev</A
  181. ></TD
  182. ><TD
  183. WIDTH="34%"
  184. ALIGN="center"
  185. VALIGN="top"
  186. ><A
  187. HREF="index.html"
  188. >Home</A
  189. ></TD
  190. ><TD
  191. WIDTH="33%"
  192. ALIGN="right"
  193. VALIGN="top"
  194. ><A
  195. HREF="sdlgetgammaramp.html"
  196. >Next</A
  197. ></TD
  198. ></TR
  199. ><TR
  200. ><TD
  201. WIDTH="33%"
  202. ALIGN="left"
  203. VALIGN="top"
  204. >SDL_SetPalette</TD
  205. ><TD
  206. WIDTH="34%"
  207. ALIGN="center"
  208. VALIGN="top"
  209. ><A
  210. HREF="video.html"
  211. >Up</A
  212. ></TD
  213. ><TD
  214. WIDTH="33%"
  215. ALIGN="right"
  216. VALIGN="top"
  217. >SDL_GetGammaRamp</TD
  218. ></TR
  219. ></TABLE
  220. ></DIV
  221. ></BODY
  222. ></HTML
  223. >