src/video/gem/SDL_gemmouse.c

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

/*
 *	GEM Mouse manager
 *
 *	Patrice Mandin
 */

#include <gem.h>

#include "SDL_mouse.h"
#include "../../events/SDL_events_c.h"
#include "../SDL_cursor_c.h"
#include "SDL_gemmouse_c.h"

/* Defines */

/*#define DEBUG_VIDEO_GEM 1*/

#define MAXCURWIDTH 16
#define MAXCURHEIGHT 16

/* The implementation dependent data for the window manager cursor */
struct WMcursor
{
    MFORM *mform_p;
};


void
GEM_FreeWMCursor(_THIS, WMcursor * cursor)
{
    if (cursor == NULL)
        return;

    graf_mouse(ARROW, NULL);

    if (cursor->mform_p != NULL)
        SDL_free(cursor->mform_p);

    SDL_free(cursor);
}

WMcursor *
GEM_CreateWMCursor(_THIS,
                   Uint8 * data, Uint8 * mask, int w, int h, int hot_x,
                   int hot_y)
{
    WMcursor *cursor;
    MFORM *new_mform;
    int i;

    /* Check the size */
    if ((w > MAXCURWIDTH) || (h > MAXCURHEIGHT)) {
        SDL_SetError("Only cursors of dimension (%dx%d) are allowed",
                     MAXCURWIDTH, MAXCURHEIGHT);
        return (NULL);
    }

    /* Allocate the cursor memory */
    cursor = (WMcursor *) SDL_malloc(sizeof(WMcursor));
    if (cursor == NULL) {
        SDL_OutOfMemory();
        return (NULL);
    }

    /* Allocate mform */
    new_mform = (MFORM *) SDL_malloc(sizeof(MFORM));
    if (new_mform == NULL) {
        SDL_free(cursor);
        SDL_OutOfMemory();
        return (NULL);
    }

    cursor->mform_p = new_mform;

    new_mform->mf_xhot = hot_x;
    new_mform->mf_yhot = hot_y;
    new_mform->mf_nplanes = 1;
    new_mform->mf_fg = 0;
    new_mform->mf_bg = 1;

    for (i = 0; i < MAXCURHEIGHT; i++) {
        new_mform->mf_mask[i] = 0;
        new_mform->mf_data[i] = 0;
    }

    if (w <= 8) {
        for (i = 0; i < h; i++) {
            new_mform->mf_mask[i] = mask[i] << 8;
            new_mform->mf_data[i] = data[i] << 8;
        }
    } else {
        for (i = 0; i < h; i++) {
            new_mform->mf_mask[i] = mask[i << 1] << 8 | mask[(i << 1) + 1];
            new_mform->mf_data[i] = data[i << 1] << 8 | data[(i << 1) + 1];
        }
    }

#ifdef DEBUG_VIDEO_GEM
    for (i = 0; i < h; i++) {
        printf("sdl:video:gem: cursor, line %d = 0x%04x\n", i,
               new_mform->mf_mask[i]);
    }

    printf("sdl:video:gem: CreateWMCursor(): done\n");
#endif

    return cursor;
}

int
GEM_ShowWMCursor(_THIS, WMcursor * cursor)
{
/*
	if (cursor == NULL) {
		graf_mouse(M_OFF, NULL);
	} else if (cursor->mform_p) {
		graf_mouse(USER_DEF, cursor->mform_p);
	}
*/
#ifdef DEBUG_VIDEO_GEM
    printf("sdl:video:gem: ShowWMCursor(0x%08x)\n", (long) cursor);
#endif

    return 1;
}

#if 0
void
GEM_WarpWMCursor(_THIS, Uint16 x, Uint16 y)
{
    /* This seems to work only on AES 3.4 (Falcon) */

    EVNTREC warpevent;

    warpevent.ap_event = APPEVNT_MOUSE;
    warpevent.ap_value = (x << 16) | y;

    appl_tplay(&warpevent, 1, 1000);
}
#endif

void
GEM_CheckMouseMode(_THIS)
{
    /* If the mouse is hidden and input is grabbed, we use relative mode */
    if ((!(SDL_cursorstate & CURSOR_VISIBLE)) &&
        (this->input_grab != SDL_GRAB_OFF) &&
        (SDL_GetAppState() & SDL_APPACTIVE)) {
        SDL_AtariXbios_LockMousePosition(SDL_TRUE);
        GEM_mouse_relative = SDL_TRUE;
    } else {
        SDL_AtariXbios_LockMousePosition(SDL_FALSE);
        GEM_mouse_relative = SDL_FALSE;
        graf_mouse(M_ON, NULL);
    }
}

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