Mercurial > sdl-ios-xcode
annotate docs/html/sdldisplayformatalpha.html @ 821:30168104389f
Date: Sat, 14 Feb 2004 14:52:40 +0200
From: "Mike Gorchak"
Subject: Batch of the QNX6 fixes for the SDL
1. Updated readme.QNX
2. Fixed crashes during intensive window updating under fast machines (got over 200 rectangles for update).
3. Fixed double-buffered fullscreen modes, now it works as needed.
4. Fixed Photon detection algorithm.
5. Fixed HWSURFACE update function.
6. Added SDL_PHOTON_FULLSCREEN_REFRESH environment variable support for control refresh rates under Photon.
7. Added 640x400 fullscreen mode emulation via 640x480 (if videodriver not supports original 640x400 mode of course) shifted by 40 vertical pixels from begin, to center it. It's needed for some old DOS games which ran in doubled 320x200 mode.
8. Added available video ram amount support.
8. Added hardware surface allocation/deallocation support if current videomode and videodriver supports it.
9. Added hardware filling support.
10. Added hardware blits support (simple and colorkeyed).
And I've added to testvidinfo test color-keyed blits benchmark (maybe need to add alpha blits benchmark too ?). Currently Photon not supporting any alpha hardware blittings (all drivers lack of alpha blitting code support, only software alpha blitting exist in photon, which is hundreds times slowest than the SDL's one). So I've not added the alpha support. I suppose new QNX 6.3 will have the hardware alpha support, so when it will be done, I'll add alpha support.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Sat, 14 Feb 2004 20:22:21 +0000 |
parents | 355632dca928 |
children |
rev | line source |
---|---|
0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_DisplayFormatAlpha</TITLE | |
5 ><META | |
6 NAME="GENERATOR" | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ |
0 | 8 "><LINK |
9 REL="HOME" | |
10 TITLE="SDL Library Documentation" | |
11 HREF="index.html"><LINK | |
12 REL="UP" | |
13 TITLE="Video" | |
14 HREF="video.html"><LINK | |
15 REL="PREVIOUS" | |
16 TITLE="SDL_DisplayFormat" | |
17 HREF="sdldisplayformat.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_WarpMouse" | |
20 HREF="sdlwarpmouse.html"></HEAD | |
21 ><BODY | |
22 CLASS="REFENTRY" | |
23 BGCOLOR="#FFF8DC" | |
24 TEXT="#000000" | |
25 LINK="#0000ee" | |
26 VLINK="#551a8b" | |
27 ALINK="#ff0000" | |
28 ><DIV | |
29 CLASS="NAVHEADER" | |
30 ><TABLE | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
31 SUMMARY="Header navigation table" |
0 | 32 WIDTH="100%" |
33 BORDER="0" | |
34 CELLPADDING="0" | |
35 CELLSPACING="0" | |
36 ><TR | |
37 ><TH | |
38 COLSPAN="3" | |
39 ALIGN="center" | |
40 >SDL Library Documentation</TH | |
41 ></TR | |
42 ><TR | |
43 ><TD | |
44 WIDTH="10%" | |
45 ALIGN="left" | |
46 VALIGN="bottom" | |
47 ><A | |
48 HREF="sdldisplayformat.html" | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
49 ACCESSKEY="P" |
0 | 50 >Prev</A |
51 ></TD | |
52 ><TD | |
53 WIDTH="80%" | |
54 ALIGN="center" | |
55 VALIGN="bottom" | |
56 ></TD | |
57 ><TD | |
58 WIDTH="10%" | |
59 ALIGN="right" | |
60 VALIGN="bottom" | |
61 ><A | |
62 HREF="sdlwarpmouse.html" | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
63 ACCESSKEY="N" |
0 | 64 >Next</A |
65 ></TD | |
66 ></TR | |
67 ></TABLE | |
68 ><HR | |
69 ALIGN="LEFT" | |
70 WIDTH="100%"></DIV | |
71 ><H1 | |
72 ><A | |
73 NAME="SDLDISPLAYFORMATALPHA" | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
74 ></A |
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
75 >SDL_DisplayFormatAlpha</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
79 NAME="AEN2432" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_DisplayFormatAlpha -- Convert a surface to the display format</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
87 NAME="AEN2435" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
94 NAME="AEN2436" |
0 | 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 | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
118 NAME="AEN2442" |
0 | 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 | |
55
55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
134 ><P |
55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
135 >This function can be used to convert a colourkey to an alpha channel, |
55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
136 if the <TT |
55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
137 CLASS="LITERAL" |
55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
138 >SDL_SRCCOLORKEY</TT |
55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
139 > flag is set on the surface. |
55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
140 The generated surface will then be transparent (alpha=0) where the |
55f1f1b3e27d
Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
141 pixels match the colourkey, and opaque (alpha=255) elsewhere.</P |
0 | 142 ></DIV |
143 ><DIV | |
144 CLASS="REFSECT1" | |
145 ><A | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
146 NAME="AEN2449" |
0 | 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 | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
160 NAME="AEN2453" |
0 | 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 | |
184 ></P | |
185 ></DIV | |
186 ><DIV | |
187 CLASS="NAVFOOTER" | |
188 ><HR | |
189 ALIGN="LEFT" | |
190 WIDTH="100%"><TABLE | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
191 SUMMARY="Footer navigation table" |
0 | 192 WIDTH="100%" |
193 BORDER="0" | |
194 CELLPADDING="0" | |
195 CELLSPACING="0" | |
196 ><TR | |
197 ><TD | |
198 WIDTH="33%" | |
199 ALIGN="left" | |
200 VALIGN="top" | |
201 ><A | |
202 HREF="sdldisplayformat.html" | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
203 ACCESSKEY="P" |
0 | 204 >Prev</A |
205 ></TD | |
206 ><TD | |
207 WIDTH="34%" | |
208 ALIGN="center" | |
209 VALIGN="top" | |
210 ><A | |
211 HREF="index.html" | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
212 ACCESSKEY="H" |
0 | 213 >Home</A |
214 ></TD | |
215 ><TD | |
216 WIDTH="33%" | |
217 ALIGN="right" | |
218 VALIGN="top" | |
219 ><A | |
220 HREF="sdlwarpmouse.html" | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
221 ACCESSKEY="N" |
0 | 222 >Next</A |
223 ></TD | |
224 ></TR | |
225 ><TR | |
226 ><TD | |
227 WIDTH="33%" | |
228 ALIGN="left" | |
229 VALIGN="top" | |
230 >SDL_DisplayFormat</TD | |
231 ><TD | |
232 WIDTH="34%" | |
233 ALIGN="center" | |
234 VALIGN="top" | |
235 ><A | |
236 HREF="video.html" | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
237 ACCESSKEY="U" |
0 | 238 >Up</A |
239 ></TD | |
240 ><TD | |
241 WIDTH="33%" | |
242 ALIGN="right" | |
243 VALIGN="top" | |
244 >SDL_WarpMouse</TD | |
245 ></TR | |
246 ></TABLE | |
247 ></DIV | |
248 ></BODY | |
249 ></HTML | |
250 > |