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annotate docs/man3/SDL_BlitSurface.3 @ 4170:092c0bc69155 SDL-1.2

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Fixed bug #618 Description From Tim Angus 2008-08-30 12:23:56 (-) [reply] As we all know SDL 1.2 doesn't handle dead keys well since one key press potentially equals two (or more) characters. For example, on many layouts, keying <backquote>,<space> results in <no character>,<backquote><space>. Since the unicode member of the SDL_keysym struct only has room for one character, only one can be returned. On Linux, the first character is returned. On Windows however, unless the exact number of characters generated by the keypress is 1, nothing is returned. The following patch addresses this inconsistency. Updated patch which includes a further fix to the handling of the numpad when numlock is on. This further fix is courtesy Amanieu d'Antras.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 13 Apr 2009 08:42:09 +0000
parents 4e3b250c950e
children 1238da4a7112
rev   line source
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1 .TH "SDL_BlitSurface" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference"
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2 .SH "NAME"
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3 SDL_BlitSurface \- This performs a fast blit from the source surface to the destination surface\&.
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4 .SH "SYNOPSIS"
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5 .PP
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6 \fB#include "SDL\&.h"
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7 .sp
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8 \fBint \fBSDL_BlitSurface\fP\fR(\fBSDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect\fR);
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9 .SH "DESCRIPTION"
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10 .PP
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11 This performs a fast blit from the source surface to the destination surface\&.
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12 .PP
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13 Only the position is used in the \fBdstrect\fR (the width and height are ignored)\&.
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14 .PP
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15 If either \fBsrcrect\fR or \fBdstrect\fR are \fBNULL\fP, the entire surface (\fBsrc\fR or \fBdst\fR) is copied\&.
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16 .PP
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17 The final blit rectangle is saved in \fBdstrect\fR after all clipping is performed (\fBsrcrect\fR is not modified)\&.
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18 .PP
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19 The blit function should not be called on a locked surface\&.
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20 .PP
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21 The results of blitting operations vary greatly depending on whether \fBSDL_SRCAPLHA\fP is set or not\&. See \fISDL_SetAlpha\fR 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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22 .PP
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23 .nf
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24 \f(CWif (source surface has SDL_SRCALPHA set) {
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25 if (source surface has alpha channel (that is, format->Amask != 0))
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26 blit using per-pixel alpha, ignoring any colour key
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27 else {
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28 if (source surface has SDL_SRCCOLORKEY set)
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29 blit using the colour key AND the per-surface alpha value
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30 else
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31 blit using the per-surface alpha value
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32 }
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33 } else {
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34 if (source surface has SDL_SRCCOLORKEY set)
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35 blit using the colour key
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36 else
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37 ordinary opaque rectangular blit
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38 }\fR
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39 .fi
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40 .PP
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41 .SH "RETURN VALUE"
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42 .PP
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43 If the blit is successful, it returns \fB0\fR, otherwise it returns \fB-1\fR\&.
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44 .PP
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45 If either of the surfaces were in video memory, and the blit returns \fB-2\fR, the video memory was lost, so it should be reloaded with artwork and re-blitted:
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46 .PP
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47 .nf
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48 \f(CW while ( SDL_BlitSurface(image, imgrect, screen, dstrect) == -2 ) {
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49 while ( SDL_LockSurface(image)) < 0 )
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50 Sleep(10);
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51 -- Write image pixels to image->pixels --
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52 SDL_UnlockSurface(image);
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53 }\fR
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54 .fi
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55 .PP
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56 This happens under DirectX 5\&.0 when the system switches away from your fullscreen application\&. Locking the surface will also fail until you have access to the video memory again\&.
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57 .SH "SEE ALSO"
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58 .PP
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59 \fI\fBSDL_LockSurface\fP\fR, \fI\fBSDL_FillRect\fP\fR, \fI\fBSDL_Surface\fR\fR, \fI\fBSDL_Rect\fR\fR
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60 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01