view src/video/x11/SDL_x11mouse.c @ 3957:b1d5b56aa549 SDL-1.2

Date: Mon, 4 Jun 2007 06:17:59 +0000 (UTC) From: George Gensure <werkt0@gmail.com> Subject: [SDL] error removal patch for SDL_x11dyn.c I found that calling SDL_GetError when an error hasn't necessarily occurred is still reporting problems from loadso regarding dynamic functions in X11. I've added the following to my local copy to avoid revealing the 'many library lookup' approach adopted by x11dyn.c:
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 13 Jun 2007 07:54:10 +0000
parents 79a4c9017550
children a1b03ba2fcd0
line wrap: on
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/*
    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"

#include <X11/Xlib.h>
#include <X11/Xutil.h>

#include "SDL_mouse.h"
#include "../../events/SDL_events_c.h"
#include "../SDL_cursor_c.h"
#include "SDL_x11dga_c.h"
#include "SDL_x11mouse_c.h"


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


void X11_FreeWMCursor(_THIS, WMcursor *cursor)
{
	if ( SDL_Display != NULL ) {
		SDL_Lock_EventThread();
		XFreeCursor(SDL_Display, cursor->x_cursor);
		XSync(SDL_Display, False);
		SDL_Unlock_EventThread();
	}
	SDL_free(cursor);
}

WMcursor *X11_CreateWMCursor(_THIS,
		Uint8 *data, Uint8 *mask, int w, int h, int hot_x, int hot_y)
{
	WMcursor *cursor;
	XGCValues GCvalues;
	GC        GCcursor;
	XImage *data_image, *mask_image;
	Pixmap  data_pixmap, mask_pixmap;
	int       clen, i;
	char     *x_data, *x_mask;
	static XColor black = {  0,  0,  0,  0 };
	static XColor white = { 0xffff, 0xffff, 0xffff, 0xffff };

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

	/* Mix the mask and the data */
	clen = (w/8)*h;
	x_data = (char *)SDL_malloc(clen);
	if ( x_data == NULL ) {
		SDL_free(cursor);
		SDL_OutOfMemory();
		return(NULL);
	}
	x_mask = (char *)SDL_malloc(clen);
	if ( x_mask == NULL ) {
		SDL_free(cursor);
		SDL_free(x_data);
		SDL_OutOfMemory();
		return(NULL);
	}
	for ( i=0; i<clen; ++i ) {
		/* The mask is OR'd with the data to turn inverted color
		   pixels black since inverted color cursors aren't supported
		   under X11.
		 */
		x_mask[i] = data[i] | mask[i];
		x_data[i] = data[i];
	}

	/* Prevent the event thread from running while we use the X server */
	SDL_Lock_EventThread();

	/* Create the data image */
	data_image = XCreateImage(SDL_Display, 
			DefaultVisual(SDL_Display, SDL_Screen),
					1, XYBitmap, 0, x_data, w, h, 8, w/8);
	data_image->byte_order = MSBFirst;
	data_image->bitmap_bit_order = MSBFirst;
	data_pixmap = XCreatePixmap(SDL_Display, SDL_Root, w, h, 1);

	/* Create the data mask */
	mask_image = XCreateImage(SDL_Display, 
			DefaultVisual(SDL_Display, SDL_Screen),
					1, XYBitmap, 0, x_mask, w, h, 8, w/8);
	mask_image->byte_order = MSBFirst;
	mask_image->bitmap_bit_order = MSBFirst;
	mask_pixmap = XCreatePixmap(SDL_Display, SDL_Root, w, h, 1);

	/* Create the graphics context */
	GCvalues.function = GXcopy;
	GCvalues.foreground = ~0;
	GCvalues.background =  0;
	GCvalues.plane_mask = AllPlanes;
	GCcursor = XCreateGC(SDL_Display, data_pixmap,
			(GCFunction|GCForeground|GCBackground|GCPlaneMask),
								&GCvalues);

	/* Blit the images to the pixmaps */
	XPutImage(SDL_Display, data_pixmap, GCcursor, data_image,
							0, 0, 0, 0, w, h);
	XPutImage(SDL_Display, mask_pixmap, GCcursor, mask_image,
							0, 0, 0, 0, w, h);
	XFreeGC(SDL_Display, GCcursor);
	/* These free the x_data and x_mask memory pointers */
	XDestroyImage(data_image);
	XDestroyImage(mask_image);

	/* Create the cursor */
	cursor->x_cursor = XCreatePixmapCursor(SDL_Display, data_pixmap,
				mask_pixmap, &black, &white, hot_x, hot_y);
	XFreePixmap(SDL_Display, data_pixmap);
	XFreePixmap(SDL_Display, mask_pixmap);

	/* Release the event thread */
	XSync(SDL_Display, False);
	SDL_Unlock_EventThread();

	return(cursor);
}

int X11_ShowWMCursor(_THIS, WMcursor *cursor)
{
	/* Don't do anything if the display is gone */
	if ( SDL_Display == NULL ) {
		return(0);
	}

	/* Set the X11 cursor cursor, or blank if cursor is NULL */
	if ( SDL_Window ) {
		SDL_Lock_EventThread();
		if ( cursor == NULL ) {
			if ( SDL_BlankCursor != NULL ) {
				XDefineCursor(SDL_Display, SDL_Window,
					SDL_BlankCursor->x_cursor);
			}
		} else {
			XDefineCursor(SDL_Display, SDL_Window, cursor->x_cursor);
		}
		XSync(SDL_Display, False);
		SDL_Unlock_EventThread();
	}
	return(1);
}

void X11_WarpWMCursor(_THIS, Uint16 x, Uint16 y)
{
	if ( using_dga & DGA_MOUSE ) {
		SDL_PrivateMouseMotion(0, 0, x, y);
	} else if ( mouse_relative) {
		/*	RJR: March 28, 2000
			leave physical cursor at center of screen if
			mouse hidden and grabbed */
		SDL_PrivateMouseMotion(0, 0, x, y);
	} else {
		SDL_Lock_EventThread();
		XWarpPointer(SDL_Display, None, SDL_Window, 0, 0, 0, 0, x, y);
		XSync(SDL_Display, False);
		SDL_Unlock_EventThread();
	}
}

/* Sets the mouse acceleration from a string of the form:
	2/1/0
   The first number is the numerator, followed by the acceleration
   denumenator and threshold.
*/
static void SetMouseAccel(_THIS, const char *accel_param)
{
	int i;
	size_t len;
	int accel_value[3];
	char *mouse_param, *mouse_param_buf, *pin;

	len = SDL_strlen(accel_param)+1;
	mouse_param_buf = SDL_stack_alloc(char, len);
	if ( ! mouse_param_buf ) {
		return;
	}
	SDL_strlcpy(mouse_param_buf, accel_param, len);
	mouse_param = mouse_param_buf;

	for ( i=0; (i < 3) && mouse_param; ++i ) {
		pin = SDL_strchr(mouse_param, '/');
		if ( pin ) {
			*pin = '\0';
		}
		accel_value[i] = atoi(mouse_param);
		if ( pin ) {
			mouse_param = pin+1;
		} else {
			mouse_param = NULL;
		}
	}
	if ( i == 3 ) {
		XChangePointerControl(SDL_Display, True, True,
			accel_value[0], accel_value[1], accel_value[2]);
	}
	SDL_stack_free(mouse_param_buf);
}

/* Check to see if we need to enter or leave mouse relative mode */
void X11_CheckMouseModeNoLock(_THIS)
{
	const Uint8 full_focus = (SDL_APPACTIVE|SDL_APPINPUTFOCUS|SDL_APPMOUSEFOCUS);
	char *env_override;
	int enable_relative = 1;

	/* Allow the user to override the relative mouse mode.
	   They almost never want to do this, as it seriously affects
	   applications that rely on continuous relative mouse motion.
	*/
	env_override = SDL_getenv("SDL_MOUSE_RELATIVE");
	if ( env_override ) {
		enable_relative = atoi(env_override);
	}

	/* If the mouse is hidden and input is grabbed, we use relative mode */
	if ( enable_relative &&
	     !(SDL_cursorstate & CURSOR_VISIBLE) &&
	     (this->input_grab != SDL_GRAB_OFF) &&
             (SDL_GetAppState() & full_focus) == full_focus ) {
		if ( ! mouse_relative ) {
			X11_EnableDGAMouse(this);
			if ( ! (using_dga & DGA_MOUSE) ) {
				char *xmouse_accel;

				SDL_GetMouseState(&mouse_last.x, &mouse_last.y);
				/* Use as raw mouse mickeys as possible */
				XGetPointerControl(SDL_Display,
						&mouse_accel.numerator, 
						&mouse_accel.denominator,
						&mouse_accel.threshold);
				xmouse_accel=SDL_getenv("SDL_VIDEO_X11_MOUSEACCEL");
				if ( xmouse_accel ) {
					SetMouseAccel(this, xmouse_accel);
				}
			}
			mouse_relative = 1;
		}
	} else {
		if ( mouse_relative ) {
			if ( using_dga & DGA_MOUSE ) {
				X11_DisableDGAMouse(this);
			} else {
				XChangePointerControl(SDL_Display, True, True,
						mouse_accel.numerator, 
						mouse_accel.denominator,
						mouse_accel.threshold);
			}
			mouse_relative = 0;
		}
	}
}
void X11_CheckMouseMode(_THIS)
{
	SDL_Lock_EventThread();
	X11_CheckMouseModeNoLock(this);
	SDL_Unlock_EventThread();
}