[sdl_omap.git] / docs / html / sdlmaprgba.html

<HTML
><HEAD
><TITLE
>SDL_MapRGBA</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
"><LINK
REL="HOME"
TITLE="SDL Library Documentation"
HREF="index.html"><LINK
REL="UP"
TITLE="Video"
HREF="video.html"><LINK
REL="PREVIOUS"
TITLE="SDL_MapRGB"
HREF="sdlmaprgb.html"><LINK
REL="NEXT"
TITLE="SDL_GetRGB"
HREF="sdlgetrgb.html"></HEAD
><BODY
CLASS="REFENTRY"
BGCOLOR="#FFF8DC"
TEXT="#000000"
LINK="#0000ee"
VLINK="#551a8b"
ALINK="#ff0000"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
>SDL Library Documentation</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="sdlmaprgb.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
></TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="sdlgetrgb.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="SDLMAPRGBA"
></A
>SDL_MapRGBA</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN1687"
></A
><H2
>Name</H2
>SDL_MapRGBA&nbsp;--&nbsp;Map a RGBA color value to a pixel format.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN1690"
></A
><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
><A
NAME="AEN1691"
></A
><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>Uint32 <B
CLASS="FSFUNC"
>SDL_MapRGBA</B
></CODE
>(SDL_PixelFormat *fmt, Uint8 r, Uint8 g, Uint8 b, Uint8 a);</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1697"
></A
><H2
>Description</H2
><P
>Maps the RGBA color value to the specified pixel format and returns the
pixel value as a 32-bit int.</P
><P
>If the format has a palette (8-bit) the index of the closest matching
color in the palette will be returned.</P
><P
>If the specified pixel format has no alpha component the alpha value
will be ignored (as it will be in formats with a palette).</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1702"
></A
><H2
>Return Value</H2
><P
>A pixel value best approximating the given RGBA color value for a given
pixel format. If the pixel format bpp (color depth) is less than 32-bpp
then the unused upper bits of the return value can safely be ignored
(e.g., with a 16-bpp format the return value can be assigned to a
<SPAN
CLASS="TYPE"
>Uint16</SPAN
>, and similarly a <SPAN
CLASS="TYPE"
>Uint8</SPAN
> for an 8-bpp
format).</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1707"
></A
><H2
>See Also</H2
><P
><A
HREF="sdlgetrgb.html"
>SDL_GetRGB</A
>,
<A
HREF="sdlgetrgba.html"
>SDL_GetRGBA</A
>,
<A
HREF="sdlmaprgb.html"
>SDL_MapRGB</A
>,
<A
HREF="sdlpixelformat.html"
>SDL_PixelFormat</A
></P
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="sdlmaprgb.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="index.html"
ACCESSKEY="H"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="sdlgetrgb.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>SDL_MapRGB</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="video.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>SDL_GetRGB</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>
Commit	Line	Data
e14743d1	1	<HTML
	2	><HEAD
	3	><TITLE
	4	>SDL_MapRGBA</TITLE
	5	><META
	6	NAME="GENERATOR"
	7	CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
	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_MapRGB"
	17	HREF="sdlmaprgb.html"><LINK
	18	REL="NEXT"
	19	TITLE="SDL_GetRGB"
	20	HREF="sdlgetrgb.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
	31	SUMMARY="Header navigation table"
	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="sdlmaprgb.html"
	49	ACCESSKEY="P"
	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="sdlgetrgb.html"
	63	ACCESSKEY="N"
	64	>Next</A
65	></TD
66	></TR
67	></TABLE
68	><HR
69	ALIGN="LEFT"
70	WIDTH="100%"></DIV
71	><H1
72	><A
73	NAME="SDLMAPRGBA"
74	></A
75	>SDL_MapRGBA</H1
76	><DIV
77	CLASS="REFNAMEDIV"
78	><A
79	NAME="AEN1687"
80	></A
81	><H2
82	>Name</H2
83	>SDL_MapRGBA -- Map a RGBA color value to a pixel format.</DIV
84	><DIV
85	CLASS="REFSYNOPSISDIV"
86	><A
87	NAME="AEN1690"
88	></A
89	><H2
90	>Synopsis</H2
91	><DIV
92	CLASS="FUNCSYNOPSIS"
93	><A
94	NAME="AEN1691"
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	>Uint32 <B
106	CLASS="FSFUNC"
107	>SDL_MapRGBA</B
108	></CODE
109	>(SDL_PixelFormat *fmt, Uint8 r, Uint8 g, Uint8 b, Uint8 a);</CODE
110	></P
111	><P
112	></P
113	></DIV
114	></DIV
115	><DIV
116	CLASS="REFSECT1"
117	><A
118	NAME="AEN1697"
119	></A
120	><H2
121	>Description</H2
122	><P
123	>Maps the RGBA color value to the specified pixel format and returns the
124	pixel value as a 32-bit int.</P
125	><P
126	>If the format has a palette (8-bit) the index of the closest matching
127	color in the palette will be returned.</P
128	><P
129	>If the specified pixel format has no alpha component the alpha value
130	will be ignored (as it will be in formats with a palette).</P
131	></DIV
132	><DIV
133	CLASS="REFSECT1"
134	><A
135	NAME="AEN1702"
136	></A
137	><H2
138	>Return Value</H2
139	><P
140	>A pixel value best approximating the given RGBA color value for a given
141	pixel format. If the pixel format bpp (color depth) is less than 32-bpp
142	then the unused upper bits of the return value can safely be ignored
143	(e.g., with a 16-bpp format the return value can be assigned to a
144	<SPAN
145	CLASS="TYPE"
146	>Uint16</SPAN
147	>, and similarly a <SPAN
148	CLASS="TYPE"
149	>Uint8</SPAN
150	> for an 8-bpp
151	format).</P
152	></DIV
153	><DIV
154	CLASS="REFSECT1"
155	><A
156	NAME="AEN1707"
157	></A
158	><H2
159	>See Also</H2
160	><P
161	><A
162	HREF="sdlgetrgb.html"
163	>SDL_GetRGB</A
164	>,
165	<A
166	HREF="sdlgetrgba.html"
167	>SDL_GetRGBA</A
168	>,
169	<A
170	HREF="sdlmaprgb.html"
171	>SDL_MapRGB</A
172	>,
173	<A
174	HREF="sdlpixelformat.html"
175	>SDL_PixelFormat</A
176	></P
177	></DIV
178	><DIV
179	CLASS="NAVFOOTER"
180	><HR
181	ALIGN="LEFT"
182	WIDTH="100%"><TABLE
183	SUMMARY="Footer navigation table"
184	WIDTH="100%"
185	BORDER="0"
186	CELLPADDING="0"
187	CELLSPACING="0"
188	><TR
189	><TD
190	WIDTH="33%"
191	ALIGN="left"
192	VALIGN="top"
193	><A
194	HREF="sdlmaprgb.html"
195	ACCESSKEY="P"
196	>Prev</A
197	></TD
198	><TD
199	WIDTH="34%"
200	ALIGN="center"
201	VALIGN="top"
202	><A
203	HREF="index.html"
204	ACCESSKEY="H"
205	>Home</A
206	></TD
207	><TD
208	WIDTH="33%"
209	ALIGN="right"
210	VALIGN="top"
211	><A
212	HREF="sdlgetrgb.html"
213	ACCESSKEY="N"
214	>Next</A
215	></TD
216	></TR
217	><TR
218	><TD
219	WIDTH="33%"
220	ALIGN="left"
221	VALIGN="top"
222	>SDL_MapRGB</TD
223	><TD
224	WIDTH="34%"
225	ALIGN="center"
226	VALIGN="top"
227	><A
228	HREF="video.html"
229	ACCESSKEY="U"
230	>Up</A
231	></TD
232	><TD
233	WIDTH="33%"
234	ALIGN="right"
235	VALIGN="top"
236	>SDL_GetRGB</TD
237	></TR
238	></TABLE
239	></DIV
240	></BODY
241	></HTML
242	>