src/video/x11/SDL_x11mouse.c
author Sam Lantinga <slouken@libsdl.org>
Wed, 01 Feb 2006 06:32:25 +0000
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Updated copyright information and removed rcs id lines (problematic in branch merges) I batch edited these files, so please let me know if I've accidentally removed anybody's credit here.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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#include "SDL_error.h"
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#include "SDL_mouse.h"
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#include "SDL_events_c.h"
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#include "SDL_cursor_c.h"
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#include "SDL_x11dga_c.h"
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#include "SDL_x11mouse_c.h"
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/* The implementation dependent data for the window manager cursor */
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struct WMcursor {
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	Cursor x_cursor;
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};
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void X11_FreeWMCursor(_THIS, WMcursor *cursor)
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{
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	if ( SDL_Display != NULL ) {
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		SDL_Lock_EventThread();
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		pXFreeCursor(SDL_Display, cursor->x_cursor);
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		pXSync(SDL_Display, False);
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		SDL_Unlock_EventThread();
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	}
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	free(cursor);
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}
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WMcursor *X11_CreateWMCursor(_THIS,
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		Uint8 *data, Uint8 *mask, int w, int h, int hot_x, int hot_y)
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{
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	WMcursor *cursor;
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	XGCValues GCvalues;
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	GC        GCcursor;
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	XImage *data_image, *mask_image;
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	Pixmap  data_pixmap, mask_pixmap;
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	int       clen, i;
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	char     *x_data, *x_mask;
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	static XColor black = {  0,  0,  0,  0 };
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	static XColor white = { 0xffff, 0xffff, 0xffff, 0xffff };
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	/* Allocate the cursor memory */
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	cursor = (WMcursor *)malloc(sizeof(WMcursor));
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	if ( cursor == NULL ) {
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		SDL_OutOfMemory();
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		return(NULL);
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	}
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	/* Mix the mask and the data */
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	clen = (w/8)*h;
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	x_data = (char *)malloc(clen);
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	if ( x_data == NULL ) {
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		free(cursor);
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		SDL_OutOfMemory();
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		return(NULL);
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	}
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	x_mask = (char *)malloc(clen);
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	if ( x_mask == NULL ) {
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		free(cursor);
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		free(x_data);
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		SDL_OutOfMemory();
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		return(NULL);
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	}
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	for ( i=0; i<clen; ++i ) {
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		/* The mask is OR'd with the data to turn inverted color
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		   pixels black since inverted color cursors aren't supported
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		   under X11.
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		 */
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		x_mask[i] = data[i] | mask[i];
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		x_data[i] = data[i];
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	}
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	/* Prevent the event thread from running while we use the X server */
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	SDL_Lock_EventThread();
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	/* Create the data image */
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	data_image = pXCreateImage(SDL_Display, 
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			DefaultVisual(SDL_Display, SDL_Screen),
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					1, XYBitmap, 0, x_data, w, h, 8, w/8);
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	data_image->byte_order = MSBFirst;
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	data_image->bitmap_bit_order = MSBFirst;
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	data_pixmap = pXCreatePixmap(SDL_Display, SDL_Root, w, h, 1);
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	/* Create the data mask */
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	mask_image = pXCreateImage(SDL_Display, 
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			DefaultVisual(SDL_Display, SDL_Screen),
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					1, XYBitmap, 0, x_mask, w, h, 8, w/8);
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	mask_image->byte_order = MSBFirst;
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	mask_image->bitmap_bit_order = MSBFirst;
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	mask_pixmap = pXCreatePixmap(SDL_Display, SDL_Root, w, h, 1);
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	/* Create the graphics context */
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	GCvalues.function = GXcopy;
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	GCvalues.foreground = ~0;
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	GCvalues.background =  0;
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	GCvalues.plane_mask = AllPlanes;
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	GCcursor = pXCreateGC(SDL_Display, data_pixmap,
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			(GCFunction|GCForeground|GCBackground|GCPlaneMask),
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								&GCvalues);
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	/* Blit the images to the pixmaps */
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	pXPutImage(SDL_Display, data_pixmap, GCcursor, data_image,
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							0, 0, 0, 0, w, h);
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	pXPutImage(SDL_Display, mask_pixmap, GCcursor, mask_image,
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							0, 0, 0, 0, w, h);
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	pXFreeGC(SDL_Display, GCcursor);
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	/* These free the x_data and x_mask memory pointers */
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	pXDestroyImage(data_image);
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	pXDestroyImage(mask_image);
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	/* Create the cursor */
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	cursor->x_cursor = pXCreatePixmapCursor(SDL_Display, data_pixmap,
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				mask_pixmap, &black, &white, hot_x, hot_y);
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	pXFreePixmap(SDL_Display, data_pixmap);
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	pXFreePixmap(SDL_Display, mask_pixmap);
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	/* Release the event thread */
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	pXSync(SDL_Display, False);
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	SDL_Unlock_EventThread();
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	return(cursor);
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}
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int X11_ShowWMCursor(_THIS, WMcursor *cursor)
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{
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	/* Don't do anything if the display is gone */
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	if ( SDL_Display == NULL ) {
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		return(0);
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	}
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	/* Set the X11 cursor cursor, or blank if cursor is NULL */
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	if ( SDL_Window ) {
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		SDL_Lock_EventThread();
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		if ( cursor == NULL ) {
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			if ( SDL_BlankCursor != NULL ) {
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				pXDefineCursor(SDL_Display, SDL_Window,
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					SDL_BlankCursor->x_cursor);
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			}
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		} else {
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			pXDefineCursor(SDL_Display, SDL_Window, cursor->x_cursor);
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		}
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		pXSync(SDL_Display, False);
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		SDL_Unlock_EventThread();
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	}
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	return(1);
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}
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void X11_WarpWMCursor(_THIS, Uint16 x, Uint16 y)
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{
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	if ( using_dga & DGA_MOUSE ) {
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		SDL_PrivateMouseMotion(0, 0, x, y);
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	} else if ( mouse_relative) {
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		/*	RJR: March 28, 2000
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			leave physical cursor at center of screen if
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			mouse hidden and grabbed */
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		SDL_PrivateMouseMotion(0, 0, x, y);
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	} else {
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		SDL_Lock_EventThread();
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		pXWarpPointer(SDL_Display, None, SDL_Window, 0, 0, 0, 0, x, y);
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		pXSync(SDL_Display, False);
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		SDL_Unlock_EventThread();
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	}
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}
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/* Sets the mouse acceleration from a string of the form:
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	2/1/0
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   The first number is the numerator, followed by the acceleration
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   denumenator and threshold.
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*/
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static void SetMouseAccel(_THIS, const char *accel_param)
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{
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	int i;
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	int accel_value[3];
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	char *mouse_param, *mouse_param_buf, *pin;
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	mouse_param_buf = (char *)malloc(strlen(accel_param)+1);
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	if ( ! mouse_param_buf ) {
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		return;
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	}
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	strcpy(mouse_param_buf, accel_param);
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	mouse_param = mouse_param_buf;
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	for ( i=0; (i < 3) && mouse_param; ++i ) {
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		pin = strchr(mouse_param, '/');
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		if ( pin ) {
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			*pin = '\0';
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		}
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		accel_value[i] = atoi(mouse_param);
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		if ( pin ) {
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			mouse_param = pin+1;
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		} else {
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			mouse_param = NULL;
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		}
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	}
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	if ( mouse_param_buf ) {
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		pXChangePointerControl(SDL_Display, True, True,
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			accel_value[0], accel_value[1], accel_value[2]);
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		free(mouse_param_buf);
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	}
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}
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/* Check to see if we need to enter or leave mouse relative mode */
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void X11_CheckMouseModeNoLock(_THIS)
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{
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	char *env_override;
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	int enable_relative = 1;
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	/* Allow the user to override the relative mouse mode.
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	   They almost never want to do this, as it seriously affects
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	   applications that rely on continuous relative mouse motion.
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	*/
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	env_override = getenv("SDL_MOUSE_RELATIVE");
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	if ( env_override ) {
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		enable_relative = atoi(env_override);
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	}
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0
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	/* If the mouse is hidden and input is grabbed, we use relative mode */
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	if ( enable_relative &&
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	     !(SDL_cursorstate & CURSOR_VISIBLE) &&
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	     (this->input_grab != SDL_GRAB_OFF) &&
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             (SDL_GetAppState() & SDL_APPACTIVE) ) {
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		if ( ! mouse_relative ) {
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			X11_EnableDGAMouse(this);
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			if ( ! (using_dga & DGA_MOUSE) ) {
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				char *xmouse_accel;
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				SDL_GetMouseState(&mouse_last.x, &mouse_last.y);
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				/* Use as raw mouse mickeys as possible */
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				pXGetPointerControl(SDL_Display,
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						&mouse_accel.numerator, 
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						&mouse_accel.denominator,
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						&mouse_accel.threshold);
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				xmouse_accel=getenv("SDL_VIDEO_X11_MOUSEACCEL");
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				if ( xmouse_accel ) {
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					SetMouseAccel(this, xmouse_accel);
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				}
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			}
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			mouse_relative = 1;
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		}
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	} else {
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		if ( mouse_relative ) {
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			if ( using_dga & DGA_MOUSE ) {
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				X11_DisableDGAMouse(this);
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			} else {
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				pXChangePointerControl(SDL_Display, True, True,
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						mouse_accel.numerator, 
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						mouse_accel.denominator,
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						mouse_accel.threshold);
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			}
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			mouse_relative = 0;
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		}
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	}
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}
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void X11_CheckMouseMode(_THIS)
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{
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	SDL_Lock_EventThread();
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	X11_CheckMouseModeNoLock(this);
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	SDL_Unlock_EventThread();
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}