author | Jani Hyvonen<jani.hyvonen@nokia.com> |
Fri, 03 Sep 2010 13:37:52 +0300 | |
branch | graphics-phase-3 |
changeset 99 | 542d4bc8b7ca |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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.TH "SDL_BlitSurface" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" |
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.SH "NAME" |
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SDL_BlitSurface \- This performs a fast blit from the source surface to the destination surface\&. |
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.SH "SYNOPSIS" |
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.PP |
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\fB#include "SDL\&.h" |
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.sp |
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\fBint \fBSDL_BlitSurface\fP\fR(\fBSDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect\fR); |
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.SH "DESCRIPTION" |
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.PP |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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This performs a fast blit from the source surface to the destination surface\&. |
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.PP |
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Only the position is used in the \fBdstrect\fR (the width and height are ignored)\&. |
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.PP |
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If either \fBsrcrect\fR or \fBdstrect\fR are \fBNULL\fP, the entire surface (\fBsrc\fR or \fBdst\fR) is copied\&. |
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.PP |
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The final blit rectangle is saved in \fBdstrect\fR after all clipping is performed (\fBsrcrect\fR is not modified)\&. |
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.PP |
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The blit function should not be called on a locked surface\&. |
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.PP |
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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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.PP |
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.nf |
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\f(CWif (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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}\fR |
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.fi |
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.PP |
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.SH "RETURN VALUE" |
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.PP |
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If the blit is successful, it returns \fB0\fR, otherwise it returns \fB-1\fR\&. |
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.PP |
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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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.PP |
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.nf |
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\f(CW 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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}\fR |
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.fi |
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.PP |
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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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.SH "SEE ALSO" |
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.PP |
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\fI\fBSDL_LockSurface\fP\fR, \fI\fBSDL_FillRect\fP\fR, \fI\fBSDL_Surface\fR\fR, \fI\fBSDL_Rect\fR\fR |
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...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01 |