annotate docs/html/sdlsetalpha.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_SetAlpha</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
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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_SetColorKey"
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17 HREF="sdlsetcolorkey.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_SetClipRect"
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20 HREF="sdlsetcliprect.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="sdlsetcolorkey.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="sdlsetcliprect.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="SDLSETALPHA"
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71 >SDL_SetAlpha</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="AEN1681"
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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_SetAlpha&nbsp;--&nbsp;Adjust the alpha properties of a 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="AEN1684"
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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="AEN1685"
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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_SetAlpha</B
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105 ></CODE
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106 >(SDL_Surface *surface, Uint32 flag, Uint8 alpha);</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="AEN1691"
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116 ></A
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117 ><H2
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118 >Description</H2
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119 ><DIV
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120 CLASS="NOTE"
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121 ><BLOCKQUOTE
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122 CLASS="NOTE"
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123 ><P
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124 ><B
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125 >Note: </B
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126 >This function and the semantics of SDL alpha blending have changed since version 1.1.4. Up until version 1.1.5, an alpha value of 0 was considered opaque and a value of 255 was considered transparent. This has now been inverted: 0 (<TT
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127 CLASS="LITERAL"
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128 >SDL_ALPHA_TRANSPARENT</TT
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129 >) is now considered transparent and 255 (<TT
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130 CLASS="LITERAL"
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131 >SDL_ALPHA_OPAQUE</TT
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132 >) is now considered opaque.</P
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133 ></BLOCKQUOTE
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134 ></DIV
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135 ><P
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136 ><TT
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137 CLASS="FUNCTION"
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138 >SDL_SetAlpha</TT
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139 > is used for setting the per-surface alpha
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140 value and/or enabling and disabling alpha blending.</P
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141 ><P
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142 >The<TT
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143 CLASS="PARAMETER"
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144 ><I
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145 >surface</I
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146 ></TT
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147 > parameter specifies which surface whose alpha
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148 attributes you wish to adjust. <TT
0
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149 CLASS="PARAMETER"
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150 ><I
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151 >flags</I
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152 ></TT
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153 > is used to specify
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154 whether alpha blending should be used (<TT
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155 CLASS="LITERAL"
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156 >SDL_SRCALPHA</TT
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157 >) and
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158 whether the surface should use RLE acceleration for blitting
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159 (<TT
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160 CLASS="LITERAL"
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161 >SDL_RLEACCEL</TT
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162 >). <TT
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163 CLASS="PARAMETER"
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164 ><I
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165 >flags</I
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166 ></TT
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167 > can be an OR'd
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168 combination of these two options, one of these options or 0. If
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169 <TT
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170 CLASS="LITERAL"
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171 >SDL_SRCALPHA</TT
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172 > is not passed as a flag then all alpha
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173 information is ignored when blitting the surface. The
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174 <TT
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175 CLASS="PARAMETER"
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176 ><I
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177 >alpha</I
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178 ></TT
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179 > parameter is the per-surface alpha value; a
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180 surface need not have an alpha channel to use per-surface alpha and blitting
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181 can still be accelerated with <TT
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182 CLASS="LITERAL"
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183 >SDL_RLEACCEL</TT
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184 >.</P
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185 ><DIV
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186 CLASS="NOTE"
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187 ><BLOCKQUOTE
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188 CLASS="NOTE"
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189 ><P
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190 ><B
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191 >Note: </B
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192 >The per-surface alpha value of 128 is considered a special case and
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193 is optimised, so it's much faster than other per-surface values.</P
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194 ></BLOCKQUOTE
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195 ></DIV
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196 ><P
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197 >Alpha effects surface blitting in the following ways:</P
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198 ><DIV
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199 CLASS="INFORMALTABLE"
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200 ><A
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201 NAME="AEN1711"
0
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202 ></A
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203 ><P
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204 ></P
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205 ><TABLE
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206 BORDER="0"
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207 CLASS="CALSTABLE"
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208 ><TBODY
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209 ><TR
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210 ><TD
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211 ALIGN="LEFT"
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212 VALIGN="TOP"
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213 >RGBA-&#62;RGB with <TT
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214 CLASS="LITERAL"
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215 >SDL_SRCALPHA</TT
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216 ></TD
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217 ><TD
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218 ALIGN="LEFT"
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219 VALIGN="TOP"
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220 ><P
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221 >The source is alpha-blended with the destination, using the alpha channel. <TT
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222 CLASS="LITERAL"
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223 >SDL_SRCCOLORKEY</TT
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224 > and the per-surface alpha are ignored.</P
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225 ></TD
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226 ></TR
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227 ><TR
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228 ><TD
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229 ALIGN="LEFT"
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230 VALIGN="TOP"
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231 >RGBA-&#62;RGB without <TT
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232 CLASS="LITERAL"
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233 >SDL_SRCALPHA</TT
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234 ></TD
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235 ><TD
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236 ALIGN="LEFT"
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237 VALIGN="TOP"
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238 ><P
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239 >The RGB data is copied from the source. The source alpha channel and the per-surface alpha value are ignored.</P
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240 ></TD
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241 ></TR
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242 ><TR
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243 ><TD
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244 ALIGN="LEFT"
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245 VALIGN="TOP"
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246 >RGB-&#62;RGBA with <TT
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247 CLASS="LITERAL"
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248 >SDL_SRCALPHA</TT
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249 ></TD
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250 ><TD
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251 ALIGN="LEFT"
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252 VALIGN="TOP"
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253 ><P
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254 >The source is alpha-blended with the destination using the per-surface alpha
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255 value. If <TT
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256 CLASS="LITERAL"
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257 >SDL_SRCCOLORKEY</TT
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258 > is set, only the pixels not
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259 matching the colorkey value are copied. The alpha channel of the copied pixels
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260 is set to opaque.</P
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261 ></TD
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262 ></TR
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263 ><TR
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264 ><TD
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265 ALIGN="LEFT"
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266 VALIGN="TOP"
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267 >RGB-&#62;RGBA without <TT
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268 CLASS="LITERAL"
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269 >SDL_SRCALPHA</TT
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270 ></TD
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271 ><TD
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272 ALIGN="LEFT"
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273 VALIGN="TOP"
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274 ><P
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275 >The RGB data is copied from the source and the alpha value of the copied pixels
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276 is set to opaque. If <TT
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277 CLASS="LITERAL"
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278 >SDL_SRCCOLORKEY</TT
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279 > is set, only the pixels
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280 not matching the colorkey value are copied. </P
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281 ></TD
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282 ></TR
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283 ><TR
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284 ><TD
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285 ALIGN="LEFT"
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286 VALIGN="TOP"
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287 >RGBA-&#62;RGBA with <TT
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288 CLASS="LITERAL"
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289 >SDL_SRCALPHA</TT
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290 ></TD
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291 ><TD
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292 ALIGN="LEFT"
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293 VALIGN="TOP"
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294 ><P
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295 >The source is alpha-blended with the destination using the source alpha
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296 channel. The alpha channel in the destination surface is left untouched.
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297 <TT
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298 CLASS="LITERAL"
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299 >SDL_SRCCOLORKEY</TT
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300 > is ignored.</P
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301 ></TD
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302 ></TR
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303 ><TR
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304 ><TD
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305 ALIGN="LEFT"
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306 VALIGN="TOP"
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307 >RGBA-&#62;RGBA without <TT
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308 CLASS="LITERAL"
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309 >SDL_SRCALPHA</TT
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310 ></TD
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311 ><TD
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312 ALIGN="LEFT"
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313 VALIGN="TOP"
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314 ><P
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315 >The RGBA data is copied to the destination surface. If <TT
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316 CLASS="LITERAL"
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317 >SDL_SRCCOLORKEY</TT
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318 > is set, only the pixels not matching the colorkey value are copied.</P
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319 ></TD
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320 ></TR
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321 ><TR
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322 ><TD
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323 ALIGN="LEFT"
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324 VALIGN="TOP"
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325 >RGB-&#62;RGB with <TT
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326 CLASS="LITERAL"
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327 >SDL_SRCALPHA</TT
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328 ></TD
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329 ><TD
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330 ALIGN="LEFT"
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331 VALIGN="TOP"
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332 ><P
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333 >The source is alpha-blended with the destination using the per-surface alpha value. If <TT
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334 CLASS="LITERAL"
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335 >SDL_SRCCOLORKEY</TT
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336 > is set, only the pixels not matching the colorkey value are copied.</P
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337 ></TD
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338 ></TR
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339 ><TR
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340 ><TD
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341 ALIGN="LEFT"
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342 VALIGN="TOP"
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343 >RGB-&#62;RGB without <TT
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344 CLASS="LITERAL"
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345 >SDL_SRCALPHA</TT
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346 ></TD
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347 ><TD
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348 ALIGN="LEFT"
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349 VALIGN="TOP"
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350 ><P
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351 >The RGB data is copied from the source. If <TT
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352 CLASS="LITERAL"
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353 >SDL_SRCCOLORKEY</TT
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354 > is set, only the pixels not matching the colorkey value are copied.</P
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355 ></TD
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356 ></TR
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357 ></TBODY
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358 ></TABLE
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359 ><P
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360 ></P
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361 ></DIV
55
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362 ><DIV
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363 CLASS="NOTE"
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364 ><BLOCKQUOTE
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365 CLASS="NOTE"
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366 ><P
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367 ><B
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368 >Note: </B
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369 > Note that RGBA-&#62;RGBA blits (with SDL_SRCALPHA set) keep the alpha
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370 of the destination surface. This means that you cannot compose two arbitrary
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371 RGBA surfaces this way and get the result you would expect from "overlaying"
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372 them; the destination alpha will work as a mask.</P
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373 ><P
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374 >Also note that per-pixel and per-surface alpha cannot be combined;
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375 the per-pixel alpha is always used if available</P
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376 ></BLOCKQUOTE
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377 ></DIV
0
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378 ></DIV
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379 ><DIV
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380 CLASS="REFSECT1"
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381 ><A
55
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382 NAME="AEN1764"
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383 ></A
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384 ><H2
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385 >Return Value</H2
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386 ><P
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387 >This function returns <SPAN
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388 CLASS="RETURNVALUE"
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389 >0</SPAN
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390 >, or
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391 <SPAN
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392 CLASS="RETURNVALUE"
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393 >-1</SPAN
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394 > if there was an error.</P
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395 ></DIV
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396 ><DIV
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397 CLASS="REFSECT1"
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398 ><A
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399 NAME="AEN1769"
0
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400 ></A
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401 ><H2
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402 >See Also</H2
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403 ><P
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404 ><A
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405 HREF="sdlmaprgba.html"
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406 ><TT
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407 CLASS="FUNCTION"
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408 >SDL_MapRGBA</TT
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409 ></A
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410 >,
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411 <A
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412 HREF="sdlgetrgba.html"
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413 ><TT
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414 CLASS="FUNCTION"
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415 >SDL_GetRGBA</TT
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416 ></A
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417 >,
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418 <A
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419 HREF="sdldisplayformatalpha.html"
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420 ><TT
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421 CLASS="FUNCTION"
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422 >SDL_DisplayFormatAlpha</TT
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423 ></A
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424 >,
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425 <A
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426 HREF="sdlblitsurface.html"
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427 ><TT
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428 CLASS="FUNCTION"
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429 >SDL_BlitSurface</TT
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430 ></A
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431 ></P
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432 ></DIV
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433 ><DIV
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434 CLASS="NAVFOOTER"
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435 ><HR
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436 ALIGN="LEFT"
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437 WIDTH="100%"><TABLE
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438 WIDTH="100%"
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439 BORDER="0"
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440 CELLPADDING="0"
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441 CELLSPACING="0"
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442 ><TR
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443 ><TD
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444 WIDTH="33%"
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445 ALIGN="left"
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446 VALIGN="top"
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447 ><A
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448 HREF="sdlsetcolorkey.html"
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449 >Prev</A
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450 ></TD
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451 ><TD
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452 WIDTH="34%"
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453 ALIGN="center"
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454 VALIGN="top"
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455 ><A
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456 HREF="index.html"
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457 >Home</A
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458 ></TD
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459 ><TD
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460 WIDTH="33%"
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461 ALIGN="right"
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462 VALIGN="top"
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463 ><A
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464 HREF="sdlsetcliprect.html"
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465 >Next</A
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466 ></TD
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467 ></TR
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468 ><TR
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469 ><TD
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470 WIDTH="33%"
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471 ALIGN="left"
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472 VALIGN="top"
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473 >SDL_SetColorKey</TD
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474 ><TD
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475 WIDTH="34%"
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476 ALIGN="center"
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477 VALIGN="top"
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478 ><A
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479 HREF="video.html"
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480 >Up</A
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481 ></TD
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482 ><TD
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483 WIDTH="33%"
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484 ALIGN="right"
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485 VALIGN="top"
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486 >SDL_SetClipRect</TD
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487 ></TR
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488 ></TABLE
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489 ></DIV
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490 ></BODY
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491 ></HTML
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492 >