view docs/html/sdlfillrect.html @ 1240:3b8a43c428bb

From Bug #36: There are a couple of issues with the selection of Altivec alpha-blitting routines in CalculateAlphaBlit() in src/video/SDL_Blit_A.c. 1) There's no check for the presence of Altivec when checking if the Blit32to565PixelAlphaAltivec() routine can be selected. 2) Altivec cannot be used in video memory, and there's no check if the destination surface is a hardware surface. (Alpha-blitting to a hardware surface with GPU support is a bad idea, but somebody's bound to do it anyway.) Patch to fix these attached.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 08 Jan 2006 21:18:15 +0000
parents 355632dca928
children
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>SDL_FillRect</TITLE
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><H1
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>SDL_FillRect</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN2351"
></A
><H2
>Name</H2
>SDL_FillRect&nbsp;--&nbsp;This function performs a fast fill of the given rectangle with some color</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN2354"
></A
><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
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><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>int <B
CLASS="FSFUNC"
>SDL_FillRect</B
></CODE
>(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color);</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN2361"
></A
><H2
>Description</H2
><P
>This function performs a fast fill of the given rectangle with
<TT
CLASS="PARAMETER"
><I
>color</I
></TT
>.  If <TT
CLASS="PARAMETER"
><I
>dstrect</I
></TT
>
is <TT
CLASS="LITERAL"
>NULL</TT
>, the whole surface will be filled with
<TT
CLASS="PARAMETER"
><I
>color</I
></TT
>.</P
><P
>The color should be a pixel of the format used by the surface, and
can be generated by the
<A
HREF="sdlmaprgb.html"
>SDL_MapRGB</A
> or <A
HREF="sdlmaprgba.html"
>SDL_MapRGBA</A
>
functions. If the color value contains an alpha value then the
destination is simply "filled" with that alpha information, no blending
takes place.</P
><P
>If there is a clip rectangle set on the destination (set via
<A
HREF="sdlsetcliprect.html"
>SDL_SetClipRect</A
>) then this
function will clip based on the intersection of the clip rectangle and
the <TT
CLASS="PARAMETER"
><I
>dstrect</I
></TT
> rectangle and the dstrect rectangle
will be modified to represent the area actually filled.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN2374"
></A
><H2
>Return Value</H2
><P
>This function returns <SPAN
CLASS="RETURNVALUE"
>0</SPAN
> on success, or
<SPAN
CLASS="RETURNVALUE"
>-1</SPAN
> on error.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN2379"
></A
><H2
>See Also</H2
><P
><A
HREF="sdlmaprgb.html"
><TT
CLASS="FUNCTION"
>SDL_MapRGB</TT
></A
>,
<A
HREF="sdlmaprgb.html"
><TT
CLASS="FUNCTION"
>SDL_MapRGBA</TT
></A
>,
<A
HREF="sdlblitsurface.html"
><TT
CLASS="FUNCTION"
>SDL_BlitSurface</TT
></A
>,
<A
HREF="sdlrect.html"
><SPAN
CLASS="STRUCTNAME"
>SDL_Rect</SPAN
></A
></P
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