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annotate docs/html/sdllocksurface.html @ 1271:092722dbc766

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author Sam Lantinga <slouken@libsdl.org>
date Thu, 26 Jan 2006 07:38:43 +0000
parents 355632dca928
children
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_LockSurface</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_FreeSurface"
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17 HREF="sdlfreesurface.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_UnlockSurface"
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20 HREF="sdlunlocksurface.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="sdlfreesurface.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="sdlunlocksurface.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="SDLLOCKSURFACE"
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74 ></A
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75 >SDL_LockSurface</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="AEN1919"
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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_LockSurface&nbsp;--&nbsp;Lock a surface for directly access.</DIV
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84 ><DIV
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85 CLASS="REFSYNOPSISDIV"
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86 ><A
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87 NAME="AEN1922"
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88 ></A
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89 ><H2
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90 >Synopsis</H2
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91 ><DIV
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92 CLASS="FUNCSYNOPSIS"
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93 ><A
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94 NAME="AEN1923"
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95 ></A
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96 ><P
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97 ></P
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98 ><PRE
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99 CLASS="FUNCSYNOPSISINFO"
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100 >#include "SDL.h"</PRE
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101 ><P
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102 ><CODE
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103 ><CODE
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104 CLASS="FUNCDEF"
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105 >int <B
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106 CLASS="FSFUNC"
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107 >SDL_LockSurface</B
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108 ></CODE
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109 >(SDL_Surface *surface);</CODE
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110 ></P
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111 ><P
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112 ></P
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113 ></DIV
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114 ></DIV
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115 ><DIV
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116 CLASS="REFSECT1"
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117 ><A
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118 NAME="AEN1929"
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119 ></A
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120 ><H2
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121 >Description</H2
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122 ><P
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123 ><TT
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124 CLASS="FUNCTION"
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125 >SDL_LockSurface</TT
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126 > sets up a surface for directly
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127 accessing the pixels. Between calls to <TT
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128 CLASS="FUNCTION"
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129 >SDL_LockSurface</TT
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130 >
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131 and <TT
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132 CLASS="FUNCTION"
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133 >SDL_UnlockSurface</TT
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134 >, you can write to and read from
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135 <TT
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136 CLASS="PARAMETER"
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137 ><I
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138 >surface-&#62;<TT
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139 CLASS="STRUCTFIELD"
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140 ><I
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141 >pixels</I
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142 ></TT
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143 ></I
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144 ></TT
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145 >, using the pixel format stored in
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146 <TT
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147 CLASS="PARAMETER"
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148 ><I
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149 >surface-&#62;<TT
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150 CLASS="STRUCTFIELD"
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151 ><I
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152 >format</I
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153 ></TT
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154 ></I
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155 ></TT
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156 >. Once you are done accessing the
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157 surface, you should use <TT
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158 CLASS="FUNCTION"
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159 >SDL_UnlockSurface</TT
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160 > to release it.</P
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161 ><P
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162 >Not all surfaces require locking.
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163 If <TT
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164 CLASS="LITERAL"
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165 >SDL_MUSTLOCK</TT
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166 >(<TT
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167 CLASS="PARAMETER"
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168 ><I
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169 >surface</I
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170 ></TT
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171 >)
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172 evaluates to <SPAN
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173 CLASS="RETURNVALUE"
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174 >0</SPAN
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175 >, then you can read and write to the
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176 surface at any time, and the pixel format of the surface will not change. </P
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177 ><P
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178 >No operating system or library calls should be made between lock/unlock
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179 pairs, as critical system locks may be held during this time.</P
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180 ><P
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181 >It should be noted, that since SDL 1.1.8 surface locks are recursive. This means that you can lock a surface multiple times, but each lock must have a match unlock.
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182 <PRE
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183 CLASS="PROGRAMLISTING"
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184 > .
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185 .
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186 SDL_LockSurface( surface );
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187 .
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188 /* Surface is locked */
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189 /* Direct pixel access on surface here */
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190 .
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191 SDL_LockSurface( surface );
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192 .
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193 /* More direct pixel access on surface */
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194 .
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195 SDL_UnlockSurface( surface );
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196 /* Surface is still locked */
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197 /* Note: Is versions &#60; 1.1.8, the surface would have been */
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198 /* no longer locked at this stage */
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199 .
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200 SDL_UnlockSurface( surface );
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201 /* Surface is now unlocked */
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202 .
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203 .</PRE
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204 ></P
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205 ></DIV
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206 ><DIV
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207 CLASS="REFSECT1"
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208 ><A
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209 NAME="AEN1947"
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210 ></A
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211 ><H2
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212 >Return Value</H2
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213 ><P
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214 ><TT
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215 CLASS="FUNCTION"
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216 >SDL_LockSurface</TT
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217 > returns <SPAN
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218 CLASS="RETURNVALUE"
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219 >0</SPAN
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220 >,
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221 or <SPAN
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222 CLASS="RETURNVALUE"
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223 >-1</SPAN
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224 > if the surface couldn't be locked.</P
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225 ></DIV
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226 ><DIV
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227 CLASS="REFSECT1"
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228 ><A
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229 NAME="AEN1953"
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230 ></A
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231 ><H2
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232 >See Also</H2
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233 ><P
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234 ><A
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235 HREF="sdlunlocksurface.html"
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236 ><TT
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237 CLASS="FUNCTION"
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238 >SDL_UnlockSurface</TT
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239 ></A
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240 ></P
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241 ></DIV
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242 ><DIV
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243 CLASS="NAVFOOTER"
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244 ><HR
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245 ALIGN="LEFT"
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246 WIDTH="100%"><TABLE
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247 SUMMARY="Footer navigation table"
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248 WIDTH="100%"
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249 BORDER="0"
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250 CELLPADDING="0"
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251 CELLSPACING="0"
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252 ><TR
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253 ><TD
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254 WIDTH="33%"
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255 ALIGN="left"
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256 VALIGN="top"
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257 ><A
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258 HREF="sdlfreesurface.html"
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259 ACCESSKEY="P"
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260 >Prev</A
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261 ></TD
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262 ><TD
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263 WIDTH="34%"
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264 ALIGN="center"
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265 VALIGN="top"
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266 ><A
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267 HREF="index.html"
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268 ACCESSKEY="H"
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269 >Home</A
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270 ></TD
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271 ><TD
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272 WIDTH="33%"
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273 ALIGN="right"
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274 VALIGN="top"
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275 ><A
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276 HREF="sdlunlocksurface.html"
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277 ACCESSKEY="N"
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278 >Next</A
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279 ></TD
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280 ></TR
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281 ><TR
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282 ><TD
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283 WIDTH="33%"
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284 ALIGN="left"
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285 VALIGN="top"
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286 >SDL_FreeSurface</TD
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287 ><TD
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288 WIDTH="34%"
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289 ALIGN="center"
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290 VALIGN="top"
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291 ><A
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292 HREF="video.html"
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293 ACCESSKEY="U"
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294 >Up</A
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295 ></TD
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296 ><TD
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297 WIDTH="33%"
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298 ALIGN="right"
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299 VALIGN="top"
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300 >SDL_UnlockSurface</TD
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301 ></TR
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302 ></TABLE
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303 ></DIV
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304 ></BODY
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305 ></HTML
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306 >