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Von: Thomas Zimmermann Betreff: [SDL] [PATCH] Make static variables const Datum: Tue, 19 May 2009 19:45:37 +0200 Hi, this is a set of simple changes which make some of SDL's internal static arrays constant. The purpose is to shrink the number of write-able static bytes and thus increase the number of memory pages shared between SDL applications. The patch set is against trunk@4513. Each of the attached patch files is specific to a sub-system. The set is completed by a second mail, because of the list's 40 KiB limit. The files readelf-r4513.txt and readelf-const-patch.txt where made by calling 'readelf -S libSDL.so'. They show the difference in ELF sections without and with the patch. Some numbers measured on my x86-64: Before [13] .rodata PROGBITS 00000000000eaaa0 000eaaa0 0000000000008170 0000000000000000 A 0 0 32 [19] .data.rel.ro PROGBITS 00000000003045e0 001045e0 00000000000023d0 0000000000000000 WA 0 0 32 [23] .data PROGBITS 00000000003076e0 001076e0 0000000000004988 0000000000000000 WA 0 0 32 After [13] .rodata PROGBITS 00000000000eaaa0 000eaaa0 0000000000009a50 0000000000000000 A 0 0 32 [19] .data.rel.ro PROGBITS 0000000000306040 00106040 0000000000002608 0000000000000000 WA 0 0 32 [23] .data PROGBITS 0000000000309360 00109360 0000000000002e88 0000000000000000 WA 0 0 32 The size of the write-able data section decreased considerably. Some entries became const-after-relocation, while most of its content went straight into the read-only data section. Best regards, Thomas
author Sam Lantinga <slouken@libsdl.org>
date Wed, 03 Jun 2009 04:37:27 +0000
parents 99210400e8b9
children
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#ifndef _SDL_wsconsvideo_h
#define _SDL_wsconsvideo_h

#include <sys/time.h>
#include <termios.h>
#include <dev/wscons/wsconsio.h>

#include "SDL_mouse.h"
#include "SDL_mutex.h"
#include "../SDL_sysvideo.h"

void WSCONS_ReportError(char *fmt, ...);

/* Hidden "this" pointer for the video functions */
#define _THIS	SDL_VideoDevice *this
#define private	(this->hidden)

/* Private display data */

typedef void WSCONS_bitBlit(Uint8 * src_pos, int srcRightDelta, // pixels, not bytes
                            int srcDownDelta,   // pixels, not bytes
                            Uint8 * dst_pos,
                            int dst_linebytes, int width, int height);

struct SDL_PrivateVideoData
{
    int fd;                     /* file descriptor of open device */
    struct wsdisplay_fbinfo info;       /* frame buffer characteristics */
    int physlinebytes;          /* number of bytes per row */
    int redMask, greenMask, blueMask;

    Uint8 *fbstart;             /* These refer to the surface used, */
    int fblinebytes;            /* physical frame buffer or shadow. */

    size_t fbmem_len;
    Uint8 *physmem;
    Uint8 *shadowmem;
    int rotate;
    int shadowFB;               /* Tells whether a shadow is being used. */

    WSCONS_bitBlit *blitFunc;

    SDL_Rect *SDL_modelist[2];

    unsigned int kbdType;
    int did_save_tty;
    struct termios saved_tty;
};


#endif /* _SDL_wsconsvideo_h */
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