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pygame / src / surflock.c

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/*
  pygame - Python Game Library
  Copyright (C) 2000-2001  Pete Shinners

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License as published by the Free Software Foundation; either
  version 2 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
  Library General Public License for more details.

  You should have received a copy of the GNU Library General Public
  License along with this library; if not, write to the Free
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  Pete Shinners
  pete@shinners.org
*/

/*
 *  internal surface locking support for python objects
 */
#define PYGAMEAPI_SURFLOCK_INTERNAL
#include "pygame.h"

static int PySurface_Lock (PyObject* surfobj);
static int PySurface_Unlock (PyObject* surfobj);

static void
PySurface_Prep (PyObject* surfobj)
{
    struct SubSurface_Data* data = ((PySurfaceObject*) surfobj)->subsurface;
    if (data)
    {
        SDL_Surface* surf = PySurface_AsSurface (surfobj);
        SDL_Surface* owner = PySurface_AsSurface (data->owner);
        PySurface_Lock (data->owner);
        surf->pixels = ((char*) owner->pixels) + data->pixeloffset;
    }
}

static void
PySurface_Unprep (PyObject* surfobj)
{
    struct SubSurface_Data* data = ((PySurfaceObject*) surfobj)->subsurface;
    if (data)
        PySurface_Unlock (data->owner);
}

static int
PySurface_Lock (PyObject* surfobj)
{
    PySurfaceObject* surf = (PySurfaceObject*) surfobj;
    if (surf->subsurface)
        PySurface_Prep (surfobj);
    if (SDL_LockSurface (surf->surf) == -1)
    {
        PyErr_SetString (PyExc_RuntimeError, "error locking surface");
        return 0;
    }
    return 1;
}

static int
PySurface_Unlock (PyObject* surfobj)
{
    PySurfaceObject* surf = (PySurfaceObject*) surfobj;
    if (surf->surf != NULL)
        SDL_UnlockSurface (surf->surf);
    if (surf->subsurface)
        PySurface_Unprep (surfobj);
    return 1;
}

/* lifetimelock object internals */
typedef struct
{
    PyObject_HEAD
    PyObject* surface;
} PyLifetimeLockObject;

static void
lifelock_dealloc (PyObject* self)
{
    PyLifetimeLockObject* lifelock = (PyLifetimeLockObject*) self;
    
    PySurface_Unlock (lifelock->surface);
    Py_DECREF (lifelock->surface);
    
    PyObject_DEL (self);
}

static PyTypeObject PyLifetimeLock_Type =
{
    PyObject_HEAD_INIT(NULL)
    0,                           /*size*/
    "SurfLifeLock",              /*name*/
    sizeof(PyLifetimeLockObject),/*basic size*/
    0,                           /*itemsize*/
    lifelock_dealloc,            /*dealloc*/
};

static PyObject*
PySurface_LockLifetime (PyObject* surf)
{
    PyLifetimeLockObject* life;
    if (!surf)
        return RAISE (PyExc_SDLError, SDL_GetError ());
    
    if (!PySurface_Lock (surf))
        return NULL;
    
    life = PyObject_NEW (PyLifetimeLockObject, &PyLifetimeLock_Type);
    if (life)
    {
        life->surface = surf;
        Py_INCREF (surf);
    }
    return (PyObject*) life;
}

static PyMethodDef surflock__builtins__[] =
{
    { NULL, NULL, 0, NULL }
};

PYGAME_EXPORT
void initsurflock (void)
{
    PyObject *module, *dict, *apiobj;
    static void* c_api[PYGAMEAPI_SURFLOCK_NUMSLOTS];
    
    PyType_Init (PyLifetimeLock_Type);

    /* Create the module and add the functions */
    module = Py_InitModule3 ("surflock", surflock__builtins__,
                             "Surface locking support");
    dict = PyModule_GetDict (module);
    
    /* export the c api */
    c_api[0] = PySurface_Prep;
    c_api[1] = PySurface_Unprep;
    c_api[2] = PySurface_Lock;
    c_api[3] = PySurface_Unlock;
    c_api[4] = PySurface_LockLifetime;
    apiobj = PyCObject_FromVoidPtr (c_api, NULL);
    PyDict_SetItemString (dict, PYGAMEAPI_LOCAL_ENTRY, apiobj);
    Py_DECREF (apiobj);
}