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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_BlitSurface</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 1.61
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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_ConvertSurface"
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17 HREF="sdlconvertsurface.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_FillRect"
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20 HREF="sdlfillrect.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="sdlconvertsurface.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="sdlfillrect.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="SDLBLITSURFACE"
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71 >SDL_BlitSurface</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="AEN1806"
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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_BlitSurface -- This performs a fast blit from the source surface to the destination 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="AEN1809"
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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="AEN1810"
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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 >int <B
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103 CLASS="FSFUNC"
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104 >SDL_BlitSurface</B
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105 ></CODE
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106 >(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect);</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="AEN1816"
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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 >This performs a fast blit from the source surface to the destination surface.</P
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121 ><P
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122 >Only the position is used in the <TT
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123 CLASS="PARAMETER"
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124 ><I
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125 >dstrect</I
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126 ></TT
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127 > (the
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128 width and height are ignored).</P
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129 ><P
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130 >If either <TT
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131 CLASS="PARAMETER"
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132 ><I
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133 >srcrect</I
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134 ></TT
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135 > or
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136 <TT
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137 CLASS="PARAMETER"
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138 ><I
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139 >dstrect</I
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140 ></TT
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141 > are <TT
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142 CLASS="LITERAL"
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143 >NULL</TT
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144 >, the entire
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145 surface (<TT
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146 CLASS="PARAMETER"
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147 ><I
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148 >src</I
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149 ></TT
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150 > or <TT
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151 CLASS="PARAMETER"
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152 ><I
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153 >dst</I
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154 ></TT
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155 >) is
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156 copied.</P
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157 ><P
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158 >The final blit rectangle is saved in
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159 <TT
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160 CLASS="PARAMETER"
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161 ><I
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162 >dstrect</I
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163 ></TT
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164 > after all clipping is performed
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165 (<TT
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166 CLASS="PARAMETER"
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167 ><I
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168 >srcrect</I
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169 ></TT
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170 > is not modified).</P
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171 ><P
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172 >The blit function should not be called on a locked surface.</P
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173 ><DIV
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174 CLASS="NOTE"
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175 ><BLOCKQUOTE
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176 CLASS="NOTE"
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177 ><P
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178 ><B
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179 >Note: </B
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180 >The results of blitting operations vary greatly depending on whether <TT
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181 CLASS="LITERAL"
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182 >SDL_SRCAPLHA</TT
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183 > is set or not. See <A
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184 HREF="sdlsetalpha.html"
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185 >SDL_SetAlpha</A
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186 >.</P
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187 ></BLOCKQUOTE
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188 ></DIV
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189 ></DIV
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190 ><DIV
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191 CLASS="REFSECT1"
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192 ><A
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193 NAME="AEN1835"
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194 ></A
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195 ><H2
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196 >Return Value</H2
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197 ><P
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198 >If the blit is successful, it returns <SPAN
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199 CLASS="RETURNVALUE"
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200 >0</SPAN
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201 >,
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202 otherwise it returns <SPAN
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203 CLASS="RETURNVALUE"
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204 >-1</SPAN
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205 >.</P
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206 ><P
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207 >If either of the surfaces were in video memory, and the blit returns
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208 <SPAN
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209 CLASS="RETURNVALUE"
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210 >-2</SPAN
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211 >, the video memory was lost, so it should be
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212 reloaded with artwork and re-blitted:
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213 <PRE
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214 CLASS="PROGRAMLISTING"
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215 > while ( SDL_BlitSurface(image, imgrect, screen, dstrect) == -2 ) {
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216 while ( SDL_LockSurface(image)) < 0 )
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217 Sleep(10);
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218 -- Write image pixels to image->pixels --
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219 SDL_UnlockSurface(image);
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220 }</PRE
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221 >
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222 This happens under DirectX 5.0 when the system switches away from your
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223 fullscreen application. Locking the surface will also fail until you
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224 have access to the video memory again.</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="AEN1843"
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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="sdllocksurface.html"
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236 ><TT
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237 CLASS="FUNCTION"
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238 >SDL_LockSurface</TT
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239 ></A
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240 >,
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241 <A
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242 HREF="sdlfillrect.html"
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243 ><TT
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244 CLASS="FUNCTION"
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245 >SDL_FillRect</TT
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246 ></A
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247 >,
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248 <A
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249 HREF="sdlsurface.html"
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250 ><SPAN
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251 CLASS="STRUCTNAME"
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252 >SDL_Surface</SPAN
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253 ></A
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254 >,
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255 <A
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256 HREF="sdlrect.html"
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257 ><SPAN
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258 CLASS="STRUCTNAME"
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259 >SDL_Rect</SPAN
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260 ></A
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261 ></P
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262 ></DIV
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263 ><DIV
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264 CLASS="NAVFOOTER"
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265 ><HR
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266 ALIGN="LEFT"
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267 WIDTH="100%"><TABLE
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268 WIDTH="100%"
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269 BORDER="0"
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270 CELLPADDING="0"
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271 CELLSPACING="0"
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272 ><TR
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273 ><TD
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274 WIDTH="33%"
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275 ALIGN="left"
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276 VALIGN="top"
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277 ><A
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278 HREF="sdlconvertsurface.html"
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279 >Prev</A
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280 ></TD
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281 ><TD
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282 WIDTH="34%"
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283 ALIGN="center"
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284 VALIGN="top"
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285 ><A
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286 HREF="index.html"
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287 >Home</A
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288 ></TD
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289 ><TD
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290 WIDTH="33%"
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291 ALIGN="right"
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292 VALIGN="top"
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293 ><A
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294 HREF="sdlfillrect.html"
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295 >Next</A
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296 ></TD
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297 ></TR
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298 ><TR
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299 ><TD
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300 WIDTH="33%"
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301 ALIGN="left"
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302 VALIGN="top"
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303 >SDL_ConvertSurface</TD
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304 ><TD
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305 WIDTH="34%"
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306 ALIGN="center"
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307 VALIGN="top"
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308 ><A
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309 HREF="video.html"
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310 >Up</A
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311 ></TD
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312 ><TD
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313 WIDTH="33%"
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314 ALIGN="right"
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315 VALIGN="top"
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316 >SDL_FillRect</TD
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317 ></TR
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318 ></TABLE
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319 ></DIV
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320 ></BODY
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321 ></HTML
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322 > |
