annotate docs/html/sdlcreatergbsurface.html @ 55:55f1f1b3e27d

Added new docs for SDL 1.2.1
author Sam Lantinga <slouken@lokigames.com>
date Sun, 10 Jun 2001 19:31:57 +0000
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children e5bc29de3f0a
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_CreateRGBSurface</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 1.64
0
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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_GetRGBA"
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17 HREF="sdlgetrgba.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_CreateRGBSurfaceFrom"
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20 HREF="sdlcreatergbsurfacefrom.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 WIDTH="100%"
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32 BORDER="0"
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33 CELLPADDING="0"
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34 CELLSPACING="0"
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35 ><TR
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36 ><TH
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37 COLSPAN="3"
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38 ALIGN="center"
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39 >SDL Library Documentation</TH
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40 ></TR
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41 ><TR
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42 ><TD
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43 WIDTH="10%"
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44 ALIGN="left"
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45 VALIGN="bottom"
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46 ><A
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47 HREF="sdlgetrgba.html"
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48 >Prev</A
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49 ></TD
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50 ><TD
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51 WIDTH="80%"
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52 ALIGN="center"
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53 VALIGN="bottom"
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54 ></TD
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55 ><TD
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56 WIDTH="10%"
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57 ALIGN="right"
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58 VALIGN="bottom"
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59 ><A
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60 HREF="sdlcreatergbsurfacefrom.html"
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61 >Next</A
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62 ></TD
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63 ></TR
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64 ></TABLE
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65 ><HR
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66 ALIGN="LEFT"
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67 WIDTH="100%"></DIV
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68 ><H1
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69 ><A
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70 NAME="SDLCREATERGBSURFACE"
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71 >SDL_CreateRGBSurface</A
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72 ></H1
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73 ><DIV
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74 CLASS="REFNAMEDIV"
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75 ><A
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76 NAME="AEN1358"
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77 ></A
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78 ><H2
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79 >Name</H2
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80 >SDL_CreateRGBSurface&nbsp;--&nbsp;Create an empty SDL_Surface</DIV
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81 ><DIV
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82 CLASS="REFSYNOPSISDIV"
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83 ><A
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84 NAME="AEN1361"
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85 ></A
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86 ><H2
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87 >Synopsis</H2
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88 ><DIV
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89 CLASS="FUNCSYNOPSIS"
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90 ><A
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91 NAME="AEN1362"
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92 ></A
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93 ><P
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94 ></P
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95 ><PRE
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96 CLASS="FUNCSYNOPSISINFO"
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97 >#include "SDL.h"</PRE
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98 ><P
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99 ><CODE
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100 ><CODE
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101 CLASS="FUNCDEF"
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102 >SDL_Surface *<B
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103 CLASS="FSFUNC"
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104 >SDL_CreateRGBSurface</B
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105 ></CODE
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106 >(Uint32 flags, int width, int height, int depth, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);</CODE
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107 ></P
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108 ><P
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109 ></P
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110 ></DIV
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111 ></DIV
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112 ><DIV
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113 CLASS="REFSECT1"
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114 ><A
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115 NAME="AEN1368"
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116 ></A
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117 ><H2
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118 >Description</H2
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119 ><P
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120 >Allocate an empty surface (must be called after <A
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121 HREF="sdlsetvideomode.html"
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122 >SDL_SetVideoMode</A
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123 >)</P
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124 ><P
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125 >If <TT
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126 CLASS="PARAMETER"
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127 ><I
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128 >depth</I
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129 ></TT
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130 > is 8 bits an empty palette is allocated for the surface, otherwise a 'packed-pixel' <A
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131 HREF="sdlpixelformat.html"
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132 ><SPAN
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133 CLASS="STRUCTNAME"
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134 >SDL_PixelFormat</SPAN
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135 ></A
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136 > is created using the <TT
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137 CLASS="PARAMETER"
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138 ><I
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139 >[RGBA]mask</I
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140 ></TT
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141 >'s provided (see <A
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142 HREF="sdlpixelformat.html"
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143 ><SPAN
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144 CLASS="STRUCTNAME"
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145 >SDL_PixelFormat</SPAN
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146 ></A
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147 >). The <TT
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148 CLASS="PARAMETER"
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149 ><I
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150 >flags</I
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151 ></TT
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152 > specifies the type of surface that should be created, it is an OR'd combination of the following possible values.</P
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153 ><DIV
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154 CLASS="INFORMALTABLE"
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155 ><A
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156 NAME="AEN1380"
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157 ></A
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158 ><P
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159 ></P
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160 ><TABLE
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161 BORDER="1"
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162 CLASS="CALSTABLE"
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163 ><TBODY
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164 ><TR
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165 ><TD
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166 ALIGN="LEFT"
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167 VALIGN="TOP"
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168 ><TT
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169 CLASS="LITERAL"
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170 >SDL_SWSURFACE</TT
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171 ></TD
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172 ><TD
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173 ALIGN="LEFT"
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174 VALIGN="TOP"
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175 >SDL will create the surface in system memory. This improves the performance of pixel level access, however you may not be able to take advantage of some types of hardware blitting.</TD
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176 ></TR
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177 ><TR
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178 ><TD
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179 ALIGN="LEFT"
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180 VALIGN="TOP"
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181 ><TT
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182 CLASS="LITERAL"
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183 >SDL_HWSURFACE</TT
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184 ></TD
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185 ><TD
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186 ALIGN="LEFT"
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187 VALIGN="TOP"
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188 >SDL will attempt to create the surface in video memory. This will allow SDL to take advantage of Video-&#62;Video blits (which are often accelerated).</TD
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189 ></TR
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190 ><TR
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191 ><TD
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192 ALIGN="LEFT"
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193 VALIGN="TOP"
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194 ><TT
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195 CLASS="LITERAL"
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196 >SDL_SRCCOLORKEY</TT
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197 ></TD
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198 ><TD
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199 ALIGN="LEFT"
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200 VALIGN="TOP"
55
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201 >This flag turns on colourkeying for blits from this surface. If
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202 <TT
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203 CLASS="LITERAL"
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204 >SDL_HWSURFACE</TT
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205 > is also specified and colourkeyed blits
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206 are hardware-accelerated, then SDL will attempt to place the surface in
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207 video memory.
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208 Use <A
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209 HREF="sdlsetcolorkey.html"
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210 ><TT
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211 CLASS="FUNCTION"
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212 >SDL_SetColorKey</TT
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213 ></A
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214 >
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215 to set or clear this flag after surface creation.</TD
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216 ></TR
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217 ><TR
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218 ><TD
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219 ALIGN="LEFT"
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220 VALIGN="TOP"
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221 ><TT
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222 CLASS="LITERAL"
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223 >SDL_SRCALPHA</TT
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224 ></TD
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225 ><TD
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226 ALIGN="LEFT"
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227 VALIGN="TOP"
55
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228 >This flag turns on alpha-blending for blits from this surface. If
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229 <TT
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230 CLASS="LITERAL"
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231 >SDL_HWSURFACE</TT
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232 > is also specified and alpha-blending blits
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233 are hardware-accelerated, then the surface will be placed in video memory if
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234 possible.
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235 Use <A
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236 HREF="sdlsetalpha.html"
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237 ><TT
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238 CLASS="FUNCTION"
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239 >SDL_SetAlpha</TT
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240 ></A
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241 > to
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242 set or clear this flag after surface creation.</TD
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243 ></TR
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244 ></TBODY
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245 ></TABLE
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246 ><P
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247 ></P
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248 ></DIV
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249 ><DIV
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250 CLASS="NOTE"
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251 ><BLOCKQUOTE
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252 CLASS="NOTE"
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253 ><P
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254 ><B
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255 >Note: </B
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256 >If an alpha-channel is specified (that is, if <TT
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257 CLASS="PARAMETER"
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258 ><I
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259 >Amask</I
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260 ></TT
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261 > is
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262 nonzero), then the <TT
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263 CLASS="LITERAL"
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264 >SDL_SRCALPHA</TT
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265 > flag is automatically
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266 set. You may remove this flag by calling
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267 <A
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268 HREF="sdlsetalpha.html"
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269 ><TT
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270 CLASS="FUNCTION"
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271 >SDL_SetAlpha</TT
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272 ></A
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273 >
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274 after surface creation.</P
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275 ></BLOCKQUOTE
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276 ></DIV
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277 ></DIV
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278 ><DIV
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279 CLASS="REFSECT1"
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280 ><A
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281 NAME="AEN1411"
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282 ></A
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283 ><H2
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284 >Return Value</H2
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285 ><P
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286 >Returns the created surface, or <SPAN
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287 CLASS="RETURNVALUE"
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288 >NULL</SPAN
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289 > upon error.</P
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290 ></DIV
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291 ><DIV
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292 CLASS="REFSECT1"
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293 ><A
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294 NAME="AEN1415"
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295 ></A
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296 ><H2
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297 >Example</H2
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298 ><PRE
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299 CLASS="PROGRAMLISTING"
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300 > /* Create a 32-bit surface with the bytes of each pixel in R,G,B,A order,
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301 as expected by OpenGL for textures */
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302 SDL_Surface *surface;
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303 Uint32 rmask, gmask, bmask, amask;
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304
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305 /* SDL interprets each pixel as a 32-bit number, so our masks must depend
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306 on the endianness (byte order) of the machine */
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307 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
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308 rmask = 0xff000000;
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309 gmask = 0x00ff0000;
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310 bmask = 0x0000ff00;
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311 amask = 0x000000ff;
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312 #else
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313 rmask = 0x000000ff;
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314 gmask = 0x0000ff00;
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315 bmask = 0x00ff0000;
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316 amask = 0xff000000;
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317 #endif
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318
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319 surface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 32,
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320 rmask, gmask, bmask, amask);
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321 if(surface == NULL) {
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322 fprintf(stderr, "CreateRGBSurface failed: %s\n", SDL_GetError());
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323 exit(1);
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324 }</PRE
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325 ></DIV
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326 ><DIV
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327 CLASS="REFSECT1"
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328 ><A
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329 NAME="AEN1418"
0
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330 ></A
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331 ><H2
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332 >See Also</H2
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333 ><P
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334 ><A
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335 HREF="sdlcreatergbsurfacefrom.html"
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336 ><TT
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337 CLASS="FUNCTION"
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338 >SDL_CreateRGBSurfaceFrom</TT
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339 ></A
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340 >,
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341 <A
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342 HREF="sdlfreesurface.html"
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343 ><TT
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344 CLASS="FUNCTION"
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345 >SDL_FreeSurface</TT
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346 ></A
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347 >,
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348 <A
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349 HREF="sdlsetvideomode.html"
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350 ><TT
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351 CLASS="FUNCTION"
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352 >SDL_SetVideoMode</TT
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353 ></A
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354 >,
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355 <A
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356 HREF="sdllocksurface.html"
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357 ><TT
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358 CLASS="FUNCTION"
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359 >SDL_LockSurface</TT
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360 ></A
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361 >,
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362 <A
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363 HREF="sdlpixelformat.html"
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364 ><SPAN
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365 CLASS="STRUCTNAME"
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366 >SDL_PixelFormat</SPAN
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367 ></A
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368 >,
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369 <A
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370 HREF="sdlsurface.html"
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371 ><SPAN
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372 CLASS="STRUCTNAME"
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373 >SDL_Surface</SPAN
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374 ></A
55
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375 >
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376 <A
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377 HREF="sdlsetalpha.html"
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378 ><TT
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379 CLASS="FUNCTION"
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380 >SDL_SetAlpha</TT
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381 ></A
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382 >
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383 <A
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384 HREF="sdlsetcolorkey.html"
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385 ><TT
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386 CLASS="FUNCTION"
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387 >SDL_SetColorKey</TT
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388 ></A
0
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389 ></P
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390 ></DIV
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391 ><DIV
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392 CLASS="NAVFOOTER"
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393 ><HR
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394 ALIGN="LEFT"
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395 WIDTH="100%"><TABLE
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396 WIDTH="100%"
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397 BORDER="0"
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398 CELLPADDING="0"
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399 CELLSPACING="0"
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400 ><TR
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401 ><TD
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402 WIDTH="33%"
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403 ALIGN="left"
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404 VALIGN="top"
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405 ><A
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406 HREF="sdlgetrgba.html"
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407 >Prev</A
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408 ></TD
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409 ><TD
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410 WIDTH="34%"
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411 ALIGN="center"
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412 VALIGN="top"
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413 ><A
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414 HREF="index.html"
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415 >Home</A
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416 ></TD
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417 ><TD
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418 WIDTH="33%"
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419 ALIGN="right"
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420 VALIGN="top"
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421 ><A
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422 HREF="sdlcreatergbsurfacefrom.html"
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423 >Next</A
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424 ></TD
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425 ></TR
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426 ><TR
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427 ><TD
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428 WIDTH="33%"
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429 ALIGN="left"
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430 VALIGN="top"
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431 >SDL_GetRGBA</TD
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432 ><TD
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433 WIDTH="34%"
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434 ALIGN="center"
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435 VALIGN="top"
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436 ><A
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437 HREF="video.html"
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438 >Up</A
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439 ></TD
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440 ><TD
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441 WIDTH="33%"
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442 ALIGN="right"
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443 VALIGN="top"
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444 >SDL_CreateRGBSurfaceFrom</TD
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445 ></TR
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446 ></TABLE
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447 ></DIV
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448 ></BODY
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449 ></HTML
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450 >