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71 ><H1 |
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73 NAME="SDLUPDATERECTS" |
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75 >SDL_UpdateRects</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="AEN1392" |
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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_UpdateRects -- Makes sure the given list of rectangles is updated on the given screen.</DIV |
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84 ><DIV |
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85 CLASS="REFSYNOPSISDIV" |
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87 NAME="AEN1395" |
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90 >Synopsis</H2 |
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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 >void <B |
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106 CLASS="FSFUNC" |
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107 >SDL_UpdateRects</B |
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108 ></CODE |
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109 >(SDL_Surface *screen, int numrects, SDL_Rect *rects);</CODE |
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110 ></P |
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111 ><P |
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120 ><H2 |
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121 >Description</H2 |
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122 ><P |
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123 >Makes sure the given list of rectangles is updated on the given screen. |
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124 The rectangles must all be confined within the screen boundaries (no |
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125 clipping is done).</P |
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126 ><P |
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127 >This function should not be called while <TT |
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128 CLASS="PARAMETER" |
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129 ><I |
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130 >screen</I |
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131 ></TT |
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132 > is |
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133 <A |
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134 HREF="sdllocksurface.html" |
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135 >locked</A |
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136 >.</P |
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137 ><DIV |
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138 CLASS="NOTE" |
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139 ><BLOCKQUOTE |
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140 CLASS="NOTE" |
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141 ><P |
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142 ><B |
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143 >Note: </B |
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144 >It is adviced to call this function only once per frame, since each |
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145 call has some processing overhead. This is no restriction since you |
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146 can pass any number of rectangles each time.</P |
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147 ><P |
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148 >The rectangles are not automatically merged or checked for overlap. In |
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149 general, the programmer can use his knowledge about his particular |
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150 rectangles to merge them in an efficient way, to avoid overdraw.</P |
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151 ></BLOCKQUOTE |
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155 CLASS="REFSECT1" |
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156 ><A |
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157 NAME="AEN1411" |
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158 ></A |
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159 ><H2 |
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160 >See Also</H2 |
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161 ><P |
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162 ><A |
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163 HREF="sdlupdaterect.html" |
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164 ><TT |
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165 CLASS="FUNCTION" |
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166 >SDL_UpdateRect</TT |
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167 ></A |
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168 >, |
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169 <A |
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170 HREF="sdlrect.html" |
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171 ><SPAN |
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172 CLASS="STRUCTNAME" |
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173 >SDL_Rect</SPAN |
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174 ></A |
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175 >, |
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176 <A |
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177 HREF="sdlsurface.html" |
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178 ><SPAN |
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179 CLASS="STRUCTNAME" |
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180 >SDL_Surface</SPAN |
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181 ></A |
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182 >, |
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183 <A |
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184 HREF="sdllocksurface.html" |
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185 ><TT |
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186 CLASS="FUNCTION" |
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187 >SDL_LockSurface</TT |
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188 ></A |
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