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Wed May 27 20:33:03 2009 UTC (10 years, 4 months ago) by Jede
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Ajouts des libs windows
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4 >SDL_DisplayFormatAlpha</TITLE
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74 ></A
75 >SDL_DisplayFormatAlpha</H1
76 ><DIV
77 CLASS="REFNAMEDIV"
78 ><A
79 NAME="AEN2432"
80 ></A
81 ><H2
82 >Name</H2
83 >SDL_DisplayFormatAlpha&nbsp;--&nbsp;Convert a surface to the display format</DIV
84 ><DIV
85 CLASS="REFSYNOPSISDIV"
86 ><A
87 NAME="AEN2435"
88 ></A
89 ><H2
90 >Synopsis</H2
91 ><DIV
92 CLASS="FUNCSYNOPSIS"
93 ><A
94 NAME="AEN2436"
95 ></A
96 ><P
97 ></P
98 ><PRE
99 CLASS="FUNCSYNOPSISINFO"
100 >#include "SDL.h"</PRE
101 ><P
102 ><CODE
103 ><CODE
104 CLASS="FUNCDEF"
105 >SDL_Surface *<B
106 CLASS="FSFUNC"
107 >SDL_DisplayFormatAlpha</B
108 ></CODE
109 >(SDL_Surface *surface);</CODE
110 ></P
111 ><P
112 ></P
113 ></DIV
114 ></DIV
115 ><DIV
116 CLASS="REFSECT1"
117 ><A
118 NAME="AEN2442"
119 ></A
120 ><H2
121 >Description</H2
122 ><P
123 >This function takes a surface and copies it to a new surface of the
124 pixel format and colors of the video framebuffer plus an alpha channel,
125 suitable for fast blitting onto the display surface. It calls
126 <A
127 HREF="sdlconvertsurface.html"
128 >SDL_ConvertSurface</A
129 ></P
130 ><P
131 >If you want to take advantage of hardware colorkey or alpha blit
132 acceleration, you should set the colorkey and alpha value before
133 calling this function.</P
134 ><P
135 >This function can be used to convert a colourkey to an alpha channel,
136 if the <TT
137 CLASS="LITERAL"
138 >SDL_SRCCOLORKEY</TT
139 > flag is set on the surface.
140 The generated surface will then be transparent (alpha=0) where the
141 pixels match the colourkey, and opaque (alpha=255) elsewhere.</P
142 ></DIV
143 ><DIV
144 CLASS="REFSECT1"
145 ><A
146 NAME="AEN2449"
147 ></A
148 ><H2
149 >Return Value</H2
150 ><P
151 >If the conversion fails or runs out of memory, it returns
152 <SPAN
153 CLASS="RETURNVALUE"
154 >NULL</SPAN
155 ></P
156 ></DIV
157 ><DIV
158 CLASS="REFSECT1"
159 ><A
160 NAME="AEN2453"
161 ></A
162 ><H2
163 >See Also</H2
164 ><P
165 ><A
166 HREF="sdlconvertsurface.html"
167 >SDL_ConvertSurface</A
168 >,
169 <A
170 HREF="sdlsetalpha.html"
171 >SDL_SetAlpha</A
172 >,
173 <A
174 HREF="sdlsetcolorkey.html"
175 >SDL_SetColorKey</A
176 >,
177 <A
178 HREF="sdldisplayformat.html"
179 >SDL_DisplayFormat</A
180 >,
181 <A
182 HREF="sdlsurface.html"
183 >SDL_Surface</A
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