forked from KolibriOS/kolibrios
332 lines
5.1 KiB
HTML
332 lines
5.1 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>SDL_BlitSurface</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.64
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"><LINK
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REL="HOME"
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TITLE="SDL_ConvertSurface"
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>SDL Library Documentation</TH
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><TD
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WIDTH="10%"
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>Prev</A
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WIDTH="100%"></DIV
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><H1
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><A
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NAME="SDLBLITSURFACE"
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>SDL_BlitSurface</A
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></H1
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><DIV
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CLASS="REFNAMEDIV"
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><A
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NAME="AEN1883"
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></A
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><H2
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>Name</H2
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>SDL_BlitSurface -- This performs a fast blit from the source surface to the destination surface.</DIV
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><DIV
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CLASS="REFSYNOPSISDIV"
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><A
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NAME="AEN1886"
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></A
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><H2
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>Synopsis</H2
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><DIV
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CLASS="FUNCSYNOPSIS"
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><A
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NAME="AEN1887"
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></A
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><P
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></P
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><PRE
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CLASS="FUNCSYNOPSISINFO"
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>#include "SDL.h"</PRE
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><P
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><CODE
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><CODE
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CLASS="FUNCDEF"
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>int <B
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CLASS="FSFUNC"
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>SDL_BlitSurface</B
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></CODE
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>(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect);</CODE
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></P
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><P
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></P
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></DIV
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN1893"
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></A
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><H2
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>Description</H2
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><P
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>This performs a fast blit from the source surface to the destination surface.</P
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><P
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>Only the position is used in the <TT
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CLASS="PARAMETER"
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><I
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>dstrect</I
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></TT
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> (the
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width and height are ignored).</P
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><P
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>If either <TT
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CLASS="PARAMETER"
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><I
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>srcrect</I
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></TT
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> or
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<TT
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CLASS="PARAMETER"
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><I
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>dstrect</I
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></TT
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> are <TT
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CLASS="LITERAL"
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>NULL</TT
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>, the entire
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surface (<TT
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CLASS="PARAMETER"
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><I
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>src</I
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></TT
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> or <TT
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CLASS="PARAMETER"
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><I
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>dst</I
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></TT
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>) is
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copied.</P
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><P
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>The final blit rectangle is saved in
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<TT
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CLASS="PARAMETER"
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><I
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>dstrect</I
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></TT
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> after all clipping is performed
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(<TT
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CLASS="PARAMETER"
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><I
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>srcrect</I
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></TT
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> is not modified).</P
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><P
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>The blit function should not be called on a locked surface.</P
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><P
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>The results of blitting operations vary greatly depending on whether <TT
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CLASS="LITERAL"
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>SDL_SRCAPLHA</TT
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> is set or not. See <A
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HREF="sdlsetalpha.html"
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>SDL_SetAlpha</A
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> for an explaination of how this affects your results. Colorkeying and alpha attributes also interact with surface blitting, as the following pseudo-code should hopefully explain.
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<PRE
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CLASS="PROGRAMLISTING"
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>if (source surface has SDL_SRCALPHA set) {
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if (source surface has alpha channel (that is, format->Amask != 0))
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blit using per-pixel alpha, ignoring any colour key
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else {
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if (source surface has SDL_SRCCOLORKEY set)
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blit using the colour key AND the per-surface alpha value
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else
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blit using the per-surface alpha value
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}
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} else {
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if (source surface has SDL_SRCCOLORKEY set)
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blit using the colour key
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else
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ordinary opaque rectangular blit
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}</PRE
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></P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN1912"
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></A
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><H2
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>Return Value</H2
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><P
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>If the blit is successful, it returns <SPAN
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CLASS="RETURNVALUE"
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>0</SPAN
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>,
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otherwise it returns <SPAN
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CLASS="RETURNVALUE"
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>-1</SPAN
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>.</P
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><P
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>If either of the surfaces were in video memory, and the blit returns
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<SPAN
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CLASS="RETURNVALUE"
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>-2</SPAN
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>, the video memory was lost, so it should be
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reloaded with artwork and re-blitted:
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<PRE
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CLASS="PROGRAMLISTING"
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> while ( SDL_BlitSurface(image, imgrect, screen, dstrect) == -2 ) {
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while ( SDL_LockSurface(image)) < 0 )
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Sleep(10);
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-- Write image pixels to image->pixels --
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SDL_UnlockSurface(image);
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}</PRE
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>
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This happens under DirectX 5.0 when the system switches away from your
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fullscreen application. Locking the surface will also fail until you
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have access to the video memory again.</P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN1920"
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></A
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><H2
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>See Also</H2
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><P
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><A
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HREF="sdllocksurface.html"
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><TT
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CLASS="FUNCTION"
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>SDL_LockSurface</TT
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></A
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>,
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<A
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HREF="sdlfillrect.html"
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><TT
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CLASS="FUNCTION"
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>SDL_FillRect</TT
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></A
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>,
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<A
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HREF="sdlsurface.html"
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><SPAN
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CLASS="STRUCTNAME"
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>SDL_Surface</SPAN
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></A
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>,
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<A
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HREF="sdlrect.html"
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><SPAN
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CLASS="STRUCTNAME"
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>SDL_Rect</SPAN
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></A
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></P
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
|
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ALIGN="left"
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VALIGN="top"
|
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><A
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HREF="sdlconvertsurface.html"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="sdlfillrect.html"
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>Next</A
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></TR
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
|
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>SDL_ConvertSurface</TD
|
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="video.html"
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>Up</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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>SDL_FillRect</TD
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> |