Mercurial > sdl-ios-xcode
view docs/man3/SDL_LockSurface.3 @ 5129:32f0f603a0c8 SDL-1.2
Fixed bug #1111
kwm@rainbow-runner.nl 2011-01-30 06:28:27 PST
When building sdl 1.2.14 with the Clang compiler http://clang.llvm.org .
The build fails in src/video/mmx.h with the following error:
--------------------------------------------------
./src/video/SDL_RLEaccel.c:831:5: error: invalid operand for instruction
CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt);
^
./src/video/SDL_RLEaccel.c:831:17: note: instantiated from:
CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt);
^
./src/video/SDL_RLEaccel.c:831:5: note: instantiated from:
CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt);
^
./src/video/SDL_RLEaccel.c:647:23: note: instantiated from:
blitter(2, Uint8, ALPHA_BLIT16_565MMX); \
^
./src/video/SDL_RLEaccel.c:282:4: note: instantiated from:
movq_r2m(mm3, *dstp); \
^
In file included from ./src/video/SDL_RLEaccel.c:99:
./src/video/mmx.h:379:28: note: instantiated from:
#define movq_r2m(reg, var) mmx_r2m(movq, reg, var)
^
<scratch space>:192:1: note: instantiated from:
"movq"
^
<inline asm>:1:2: note: instantiated into assembly here
movq %mm3, %dx
^
--------------------------------------------------
According to the clang developers this is a invalid inline assembly.
Using the attached patch from the last commit in the below bug report fixes the
compile.
More details from: http://llvm.org/bugs/show_bug.cgi?id=6730
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Sun, 30 Jan 2011 13:38:57 -0800 |
parents | 1238da4a7112 |
children |
line wrap: on
line source
.TH "SDL_LockSurface" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" .SH "NAME" SDL_LockSurface \- Lock a surface for directly access\&. .SH "SYNOPSIS" .PP \fB#include "SDL\&.h" .sp \fBint \fBSDL_LockSurface\fP\fR(\fBSDL_Surface *surface\fR); .SH "DESCRIPTION" .PP \fBSDL_LockSurface\fP sets up a surface for directly accessing the pixels\&. Between calls to \fBSDL_LockSurface\fP and \fBSDL_UnlockSurface\fP, you can write to and read from \fBsurface->\fBpixels\fR\fR, using the pixel format stored in \fBsurface->\fBformat\fR\fR\&. Once you are done accessing the surface, you should use \fBSDL_UnlockSurface\fP to release it\&. .PP Not all surfaces require locking\&. If \fBSDL_MUSTLOCK\fP(\fBsurface\fR) evaluates to \fB0\fR, then you can read and write to the surface at any time, and the pixel format of the surface will not change\&. .PP No operating system or library calls should be made between lock/unlock pairs, as critical system locks may be held during this time\&. .PP It should be noted, that since SDL 1\&.1\&.8 surface locks are recursive\&. This means that you can lock a surface multiple times, but each lock must have a match unlock\&. .PP .nf \f(CW \&. \&. SDL_LockSurface( surface ); \&. /* Surface is locked */ /* Direct pixel access on surface here */ \&. SDL_LockSurface( surface ); \&. /* More direct pixel access on surface */ \&. SDL_UnlockSurface( surface ); /* Surface is still locked */ /* Note: Is versions < 1\&.1\&.8, the surface would have been */ /* no longer locked at this stage */ \&. SDL_UnlockSurface( surface ); /* Surface is now unlocked */ \&. \&.\fR .fi .PP .SH "RETURN VALUE" .PP \fBSDL_LockSurface\fP returns \fB0\fR, or \fB-1\fR if the surface couldn\&'t be locked\&. .SH "SEE ALSO" .PP \fI\fBSDL_UnlockSurface\fP\fR .\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01