sdl_x11modes.c

SDL库 在进行视频显示程序spcaview安装时必须的库文件

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 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
    [e-mail]
*/
#include "SDL_config.h"

/* Utilities for getting and setting the X display mode */

#include <stdio.h>

#include "SDL_timer.h"
#include "SDL_events.h"
#include "../../events/SDL_events_c.h"
#include "SDL_x11video.h"
#include "SDL_x11wm_c.h"
#include "SDL_x11modes_c.h"
#include "SDL_x11image_c.h"

/*#define X11MODES_DEBUG*/

#define MAX(a, b)        (a > b ? a : b)

#if SDL_VIDEO_DRIVER_X11_XRANDR
static int cmpmodelist(const void *va, const void *vb)
{
    const SDL_Rect *a = *(const SDL_Rect **)va;
    const SDL_Rect *b = *(const SDL_Rect **)vb;
    if ( a->w == b->w )
        return b->h - a->h;
    else
        return b->w - a->w;
}
#endif

#if SDL_VIDEO_DRIVER_X11_VIDMODE
Bool SDL_NAME(XF86VidModeGetModeInfo)(Display *dpy, int scr, SDL_NAME(XF86VidModeModeInfo) *info)
{
    SDL_NAME(XF86VidModeModeLine) *l = (SDL_NAME(XF86VidModeModeLine)*)((char*)info + sizeof info->dotclock);
    return SDL_NAME(XF86VidModeGetModeLine)(dpy, scr, (int*)&info->dotclock, l);
}
#endif /* SDL_VIDEO_DRIVER_X11_VIDMODE */

#if SDL_VIDEO_DRIVER_X11_VIDMODE
static void save_mode(_THIS)
{
    SDL_memset(&saved_mode, 0, sizeof(saved_mode));
    SDL_NAME(XF86VidModeGetModeInfo)(SDL_Display,SDL_Screen,&saved_mode);
    SDL_NAME(XF86VidModeGetViewPort)(SDL_Display,SDL_Screen,&saved_view.x,&saved_view.y);
}
#endif

#if SDL_VIDEO_DRIVER_X11_VIDMODE
static void restore_mode(_THIS)
{
    SDL_NAME(XF86VidModeModeLine) mode;
    int unused;

    if ( SDL_NAME(XF86VidModeGetModeLine)(SDL_Display, SDL_Screen, &unused, &mode) ) {
        if ( (saved_mode.hdisplay != mode.hdisplay) ||
             (saved_mode.vdisplay != mode.vdisplay) ) {
            SDL_NAME(XF86VidModeSwitchToMode)(SDL_Display, SDL_Screen, &saved_mode);
        }
    }
    if ( (saved_view.x != 0) || (saved_view.y != 0) ) {
        SDL_NAME(XF86VidModeSetViewPort)(SDL_Display, SDL_Screen, saved_view.x, saved_view.y);
    }
}
#endif

#if SDL_VIDEO_DRIVER_X11_VIDMODE
static int cmpmodes(const void *va, const void *vb)
{
    const SDL_NAME(XF86VidModeModeInfo) *a = *(const SDL_NAME(XF86VidModeModeInfo)**)va;
    const SDL_NAME(XF86VidModeModeInfo) *b = *(const SDL_NAME(XF86VidModeModeInfo)**)vb;
    if ( a->hdisplay == b->hdisplay )
        return b->vdisplay - a->vdisplay;
    else
        return b->hdisplay - a->hdisplay;
}
#endif

static void get_real_resolution(_THIS, int* w, int* h);

static void set_best_resolution(_THIS, int width, int height)
{
#if SDL_VIDEO_DRIVER_X11_VIDMODE
    if ( use_vidmode ) {
        SDL_NAME(XF86VidModeModeLine) mode;
        SDL_NAME(XF86VidModeModeInfo) **modes;
        int i;
        int nmodes;
        int best = -1;

        if ( SDL_NAME(XF86VidModeGetModeLine)(SDL_Display, SDL_Screen, &i, &mode) &&
             SDL_NAME(XF86VidModeGetAllModeLines)(SDL_Display,SDL_Screen,&nmodes,&modes) ) {
            for ( i = 0; i < nmodes ; i++ ) {
                if ( (modes[i]->hdisplay == width) &&
                     (modes[i]->vdisplay == height) ) {
                    best = i;
                    break;
                }
                if ( modes[i]->hdisplay >= width &&
                     modes[i]->vdisplay >= height ) {
                    if ( best < 0 ||
                         (modes[i]->hdisplay < modes[best]->hdisplay &&
                          modes[i]->vdisplay <= modes[best]->vdisplay) ||
                         (modes[i]->vdisplay < modes[best]->vdisplay &&
                          modes[i]->hdisplay <= modes[best]->hdisplay) ) {
                        best = i;
                    }
                }
            }
            if ( best >= 0 &&
                 ((modes[best]->hdisplay != mode.hdisplay) ||
                  (modes[best]->vdisplay != mode.vdisplay)) ) {
#ifdef X11MODES_DEBUG
                printf("Best Mode %d: %d x %d @ %d\n", best,
                        modes[best]->hdisplay, modes[best]->vdisplay,
                        (modes[best]->htotal && modes[best]->vtotal) ? (1000 * modes[best]->dotclock / (modes[best]->htotal * modes[best]->vtotal)) : 0 );
#endif
                SDL_NAME(XF86VidModeSwitchToMode)(SDL_Display, SDL_Screen, modes[best]);
            }
            XFree(modes);
        }
    }
#endif /* SDL_VIDEO_DRIVER_X11_VIDMODE */

                                /* XiG */
#if SDL_VIDEO_DRIVER_X11_XME
    if ( use_xme && SDL_modelist ) {
        int i;

#ifdef X11MODES_DEBUG
        fprintf(stderr, "XME: set_best_resolution(): w = %d, h = %d\n",
                width, height);
#endif
        for ( i=0; SDL_modelist[i]; ++i ) {
            if ( (SDL_modelist[i]->w >= width) &&
                 (SDL_modelist[i]->h >= height) ) {
                break;
            }
        }
        
        if ( SDL_modelist[i] ) { /* found one, lets try it */
            int w, h;        

            /* check current mode so we can avoid uneccessary mode changes */
            get_real_resolution(this, &w, &h);

            if ( (SDL_modelist[i]->w != w) || (SDL_modelist[i]->h != h) ) {
#ifdef X11MODES_DEBUG
                fprintf(stderr, "XME: set_best_resolution: "
                        "XiGMiscChangeResolution: %d %d\n",
                        SDL_modelist[i]->w, SDL_modelist[i]->h);
#endif
                XiGMiscChangeResolution(SDL_Display, 
                                        SDL_Screen,
                                        0, /* view */
                                        SDL_modelist[i]->w, 
                                        SDL_modelist[i]->h, 
                                        0);
                XSync(SDL_Display, False);
            }
        }
    }
#endif /* SDL_VIDEO_DRIVER_X11_XME */

#if SDL_VIDEO_DRIVER_X11_XRANDR
    if ( use_xrandr && SDL_modelist ) {
#ifdef X11MODES_DEBUG
        fprintf(stderr, "XRANDR: set_best_resolution(): w = %d, h = %d\n",
                width, height);
#endif
        int i, nsizes;
        XRRScreenSize *sizes;

        /* find the smallest resolution that is at least as big as the user requested */
        sizes = XRRConfigSizes(screen_config, &nsizes);
        for ( i = (nsizes-1); i >= 0; i-- ) {
            if ( (SDL_modelist[i]->w >= width) &&
                 (SDL_modelist[i]->h >= height) ) {
                break;
            }
        }

        if ( i >= 0 && SDL_modelist[i] ) { /* found one, lets try it */
            int w, h;

            /* check current mode so we can avoid uneccessary mode changes */
            get_real_resolution(this, &w, &h);

            if ( (SDL_modelist[i]->w != w) || (SDL_modelist[i]->h != h) ) {
                int size_id;

#ifdef X11MODES_DEBUG
                fprintf(stderr, "XRANDR: set_best_resolution: "
                        "XXRSetScreenConfig: %d %d\n",
                        SDL_modelist[i]->w, SDL_modelist[i]->h);
#endif

                /* find the matching size entry index */
                for ( size_id = 0; size_id < nsizes; ++size_id ) {
                    if ( (sizes[size_id].width == SDL_modelist[i]->w) &&
                         (sizes[size_id].height == SDL_modelist[i]->h) )
                        break;
                }

                XRRSetScreenConfig(SDL_Display, screen_config, SDL_Root,
                                   size_id, saved_rotation, CurrentTime);
            }
        }
    }
#endif /* SDL_VIDEO_DRIVER_X11_XRANDR */
}

static void get_real_resolution(_THIS, int* w, int* h)
{
#if SDL_VIDEO_DRIVER_X11_XME
    if ( use_xme ) {
        int ractive;
        XiGMiscResolutionInfo *modelist;

        XiGMiscQueryResolutions(SDL_Display, SDL_Screen,
                                0, /* view */
                                &ractive, &modelist);
        *w = modelist[ractive].width;
        *h = modelist[ractive].height;
#ifdef X11MODES_DEBUG
        fprintf(stderr, "XME: get_real_resolution: w = %d h = %d\n", *w, *h);
#endif
        XFree(modelist);
        return;
    }
#endif /* SDL_VIDEO_DRIVER_X11_XME */

#if SDL_VIDEO_DRIVER_X11_VIDMODE
    if ( use_vidmode ) {
        SDL_NAME(XF86VidModeModeLine) mode;
        int unused;

        if ( SDL_NAME(XF86VidModeGetModeLine)(SDL_Display, SDL_Screen, &unused, &mode) ) {
            *w = mode.hdisplay;
            *h = mode.vdisplay;
            return;
        }
    }
#endif /* SDL_VIDEO_DRIVER_X11_VIDMODE */

#if SDL_VIDEO_DRIVER_X11_XRANDR
    if ( use_xrandr ) {
        int nsizes;
        XRRScreenSize* sizes;

        sizes = XRRConfigSizes(screen_config, &nsizes);
        if ( nsizes > 0 ) {
            int cur_size;
            Rotation cur_rotation;

            cur_size = XRRConfigCurrentConfiguration(screen_config, &cur_rotation);
            if ( cur_size >= 0 && cur_size < nsizes ) {
                *w = sizes[cur_size].width;
                *h = sizes[cur_size].height;
            }
#ifdef X11MODES_DEBUG
            fprintf(stderr, "XRANDR: get_real_resolution: w = %d h = %d\n", *w, *h);
#endif
            return;
        }
    }
#endif /* SDL_VIDEO_DRIVER_X11_XRANDR */

#if SDL_VIDEO_DRIVER_X11_XINERAMA
    if ( use_xinerama ) {
        *w = xinerama_info.width;
        *h = xinerama_info.height;
        return;
    }
#endif /* SDL_VIDEO_DRIVER_X11_XINERAMA */

    *w = DisplayWidth(SDL_Display, SDL_Screen);
    *h = DisplayHeight(SDL_Display, SDL_Screen);
}

/* Called after mapping a window - waits until the window is mapped */
void X11_WaitMapped(_THIS, Window win)
{
    XEvent event;
    do {
        XMaskEvent(SDL_Display, StructureNotifyMask, &event);
    } while ( (event.type != MapNotify) || (event.xmap.event != win) );
}

/* Called after unmapping a window - waits until the window is unmapped */
void X11_WaitUnmapped(_THIS, Window win)
{
    XEvent event;
    do {
        XMaskEvent(SDL_Display, StructureNotifyMask, &event);
    } while ( (event.type != UnmapNotify) || (event.xunmap.event != win) );
}

static void move_cursor_to(_THIS, int x, int y)
{
    XWarpPointer(SDL_Display, None, SDL_Root, 0, 0, 0, 0, x, y);
}

static int add_visual(_THIS, int depth, int class)
{
    XVisualInfo vi;
    if(XMatchVisualInfo(SDL_Display, SDL_Screen, depth, class, &vi)) {
        int n = this->hidden->nvisuals;
        this->hidden->visuals[n].depth = vi.depth;
        this->hidden->visuals[n].visual = vi.visual;
        this->hidden->nvisuals++;
    }
    return(this->hidden->nvisuals);
}
static int add_visual_byid(_THIS, const char *visual_id)
{
    XVisualInfo *vi, template;
    int nvis;

    if ( visual_id ) {
        SDL_memset(&template, 0, (sizeof template));
        template.visualid = SDL_strtol(visual_id, NULL, 0);
        vi = XGetVisualInfo(SDL_Display, VisualIDMask, &template, &nvis);
        if ( vi ) {
            int n = this->hidden->nvisuals;
            this->hidden->visuals[n].depth = vi->depth;
            this->hidden->visuals[n].visual = vi->visual;
            this->hidden->nvisuals++;
            XFree(vi);
        }
    }
    return(this->hidden->nvisuals);
}

/* Global for the error handler */
int vm_event, vm_error = -1;

#if SDL_VIDEO_DRIVER_X11_XINERAMA
static int CheckXinerama(_THIS, int *major, int *minor)
{
    const char *env;

    /* Default the extension not available */
    *major = *minor = 0;

    /* Allow environment override */
    env = getenv("SDL_VIDEO_X11_XINERAMA");
    if ( env && !SDL_atoi(env) ) {
        return 0;
    }