Mercurial > sdl-ios-xcode

annotate docs/html/sdlsetcolorkey.html @ 2415:93fd226af6d0 gsoc2008_iphone

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updated XCode project, now includes files for keyboard support (oops)
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Wed, 13 Aug 2008 18:16:27 +0000
parents 355632dca928
children
rev   line source
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_SetColorKey</TITLE
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5 ><META
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6 NAME="GENERATOR"
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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8 "><LINK
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9 REL="HOME"
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10 TITLE="SDL Library Documentation"
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11 HREF="index.html"><LINK
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12 REL="UP"
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13 TITLE="Video"
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14 HREF="video.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="SDL_SaveBMP"
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17 HREF="sdlsavebmp.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_SetAlpha"
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20 HREF="sdlsetalpha.html"></HEAD
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21 ><BODY
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22 CLASS="REFENTRY"
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23 BGCOLOR="#FFF8DC"
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24 TEXT="#000000"
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25 LINK="#0000ee"
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26 VLINK="#551a8b"
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27 ALINK="#ff0000"
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28 ><DIV
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29 CLASS="NAVHEADER"
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30 ><TABLE
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31 SUMMARY="Header navigation table"
0
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32 WIDTH="100%"
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33 BORDER="0"
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34 CELLPADDING="0"
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35 CELLSPACING="0"
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36 ><TR
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37 ><TH
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38 COLSPAN="3"
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39 ALIGN="center"
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40 >SDL Library Documentation</TH
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41 ></TR
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42 ><TR
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43 ><TD
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44 WIDTH="10%"
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45 ALIGN="left"
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46 VALIGN="bottom"
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47 ><A
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48 HREF="sdlsavebmp.html"
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49 ACCESSKEY="P"
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50 >Prev</A
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51 ></TD
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52 ><TD
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53 WIDTH="80%"
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54 ALIGN="center"
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55 VALIGN="bottom"
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56 ></TD
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57 ><TD
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58 WIDTH="10%"
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59 ALIGN="right"
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60 VALIGN="bottom"
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61 ><A
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62 HREF="sdlsetalpha.html"
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63 ACCESSKEY="N"
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64 >Next</A
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65 ></TD
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66 ></TR
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67 ></TABLE
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68 ><HR
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69 ALIGN="LEFT"
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70 WIDTH="100%"></DIV
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71 ><H1
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72 ><A
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73 NAME="SDLSETCOLORKEY"
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74 ></A
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75 >SDL_SetColorKey</H1
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76 ><DIV
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77 CLASS="REFNAMEDIV"
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78 ><A
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79 NAME="AEN2045"
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80 ></A
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81 ><H2
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82 >Name</H2
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83 >SDL_SetColorKey&nbsp;--&nbsp;Sets the color key (transparent pixel) in a blittable surface and
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84 RLE acceleration.</DIV
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85 ><DIV
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86 CLASS="REFSYNOPSISDIV"
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87 ><A
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88 NAME="AEN2048"
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89 ></A
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90 ><H2
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91 >Synopsis</H2
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92 ><DIV
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93 CLASS="FUNCSYNOPSIS"
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94 ><A
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95 NAME="AEN2049"
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96 ></A
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97 ><P
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98 ></P
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99 ><PRE
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100 CLASS="FUNCSYNOPSISINFO"
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101 >#include "SDL.h"</PRE
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102 ><P
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103 ><CODE
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104 ><CODE
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105 CLASS="FUNCDEF"
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106 >int <B
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107 CLASS="FSFUNC"
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108 >SDL_SetColorKey</B
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109 ></CODE
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110 >(SDL_Surface *surface, Uint32 flag, Uint32 key);</CODE
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111 ></P
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112 ><P
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113 ></P
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114 ></DIV
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115 ></DIV
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116 ><DIV
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117 CLASS="REFSECT1"
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118 ><A
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119 NAME="AEN2055"
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120 ></A
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121 ><H2
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122 >Description</H2
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123 ><P
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124 > Sets the color key (transparent pixel) in a blittable surface and enables or
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125 disables RLE blit acceleration.</P
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126 ><P
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127 >RLE acceleration can substantially speed up blitting of images with large
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128 horizontal runs of transparent pixels (i.e., pixels that match the
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129 <TT
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130 CLASS="PARAMETER"
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131 ><I
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132 >key</I
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133 ></TT
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134 > value). The <TT
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135 CLASS="PARAMETER"
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136 ><I
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137 >key</I
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138 ></TT
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139 > must be of the same pixel format as the <TT
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140 CLASS="PARAMETER"
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141 ><I
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142 >surface</I
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143 ></TT
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144 >, <A
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145 HREF="sdlmaprgb.html"
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146 ><TT
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147 CLASS="FUNCTION"
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148 >SDL_MapRGB</TT
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149 ></A
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150 > is often useful for obtaining an acceptable value.</P
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151 ><P
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152 >If <TT
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153 CLASS="PARAMETER"
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154 ><I
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155 >flag</I
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156 ></TT
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157 > is <TT
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158 CLASS="LITERAL"
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159 >SDL_SRCCOLORKEY</TT
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160 > then
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161 <TT
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162 CLASS="PARAMETER"
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163 ><I
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164 >key</I
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165 ></TT
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166 > is the transparent pixel value in the source image of a
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167 blit.</P
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168 ><P
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169 >If <TT
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170 CLASS="PARAMETER"
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171 ><I
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172 >flag</I
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173 ></TT
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174 > is OR'd with
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175 <TT
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176 CLASS="LITERAL"
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177 >SDL_RLEACCEL</TT
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178 > then the surface will be draw using RLE
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179 acceleration when drawn with
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180 <A
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181 HREF="sdlblitsurface.html"
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182 >SDL_BlitSurface</A
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183 >. The surface will
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184 actually be encoded for RLE acceleration the first time
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185 <A
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186 HREF="sdlblitsurface.html"
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187 >SDL_BlitSurface</A
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188 > or
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189 <A
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190 HREF="sdldisplayformat.html"
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191 >SDL_DisplayFormat</A
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192 > is called on the
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193 surface.</P
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194 ><P
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195 >If <TT
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196 CLASS="PARAMETER"
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197 ><I
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198 >flag</I
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199 ></TT
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200 > is 0, this function clears
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201 any current color key.</P
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202 ></DIV
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203 ><DIV
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204 CLASS="REFSECT1"
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205 ><A
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206 NAME="AEN2076"
0
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207 ></A
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208 ><H2
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209 >Return Value</H2
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210 ><P
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211 >This function returns <SPAN
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212 CLASS="RETURNVALUE"
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213 >0</SPAN
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214 >, or
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215 <SPAN
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216 CLASS="RETURNVALUE"
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217 >-1</SPAN
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218 > if there was an error.</P
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219 ></DIV
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220 ><DIV
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221 CLASS="REFSECT1"
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222 ><A
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223 NAME="AEN2081"
0
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224 ></A
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225 ><H2
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226 >See Also</H2
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227 ><P
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228 ><A
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229 HREF="sdlblitsurface.html"
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230 ><TT
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231 CLASS="FUNCTION"
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232 >SDL_BlitSurface</TT
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233 ></A
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234 >,
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235 <A
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236 HREF="sdldisplayformat.html"
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237 ><TT
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238 CLASS="FUNCTION"
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239 >SDL_DisplayFormat</TT
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240 ></A
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241 >,
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242 <A
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243 HREF="sdlmaprgb.html"
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244 ><TT
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245 CLASS="FUNCTION"
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246 >SDL_MapRGB</TT
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247 ></A
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248 >,
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249 <A
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250 HREF="sdlsetalpha.html"
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251 ><TT
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252 CLASS="FUNCTION"
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253 >SDL_SetAlpha</TT
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254 ></A
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255 ></P
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256 ></DIV
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257 ><DIV
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258 CLASS="NAVFOOTER"
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259 ><HR
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260 ALIGN="LEFT"
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261 WIDTH="100%"><TABLE
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262 SUMMARY="Footer navigation table"
0
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263 WIDTH="100%"
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264 BORDER="0"
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265 CELLPADDING="0"
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266 CELLSPACING="0"
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267 ><TR
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268 ><TD
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269 WIDTH="33%"
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270 ALIGN="left"
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271 VALIGN="top"
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272 ><A
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273 HREF="sdlsavebmp.html"
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274 ACCESSKEY="P"
0
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275 >Prev</A
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276 ></TD
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277 ><TD
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278 WIDTH="34%"
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279 ALIGN="center"
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280 VALIGN="top"
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281 ><A
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282 HREF="index.html"
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283 ACCESSKEY="H"
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284 >Home</A
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285 ></TD
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286 ><TD
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287 WIDTH="33%"
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288 ALIGN="right"
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289 VALIGN="top"
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290 ><A
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291 HREF="sdlsetalpha.html"
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292 ACCESSKEY="N"
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293 >Next</A
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294 ></TD
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295 ></TR
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296 ><TR
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297 ><TD
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298 WIDTH="33%"
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299 ALIGN="left"
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300 VALIGN="top"
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301 >SDL_SaveBMP</TD
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302 ><TD
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303 WIDTH="34%"
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304 ALIGN="center"
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305 VALIGN="top"
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306 ><A
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307 HREF="video.html"
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308 ACCESSKEY="U"
0
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309 >Up</A
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310 ></TD
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311 ><TD
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312 WIDTH="33%"
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313 ALIGN="right"
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314 VALIGN="top"
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315 >SDL_SetAlpha</TD
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316 ></TR
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317 ></TABLE
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318 ></DIV
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319 ></BODY
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320 ></HTML
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321 >