src/video/x11/SDL_x11mouse.c - third_party/sdl - Git at Google

 /*
   Simple DirectMedia Layer
   Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>

   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
   arising from the use of this software.

   Permission is granted to anyone to use this software for any purpose,
   including commercial applications, and to alter it and redistribute it
   freely, subject to the following restrictions:

   1. The origin of this software must not be misrepresented; you must not
      claim that you wrote the original software. If you use this software
      in a product, an acknowledgment in the product documentation would be
      appreciated but is not required.
   2. Altered source versions must be plainly marked as such, and must not be
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
 #include "SDL_config.h"

 #if SDL_VIDEO_DRIVER_X11

 #include "SDL_assert.h"
 #include "SDL_x11video.h"
 #include "SDL_x11mouse.h"
 #include "../../events/SDL_mouse_c.h"


 /* FIXME: Find a better place to put this... */
 static Cursor x11_empty_cursor = None;

 static Display *
 GetDisplay(void)
 {
     return ((SDL_VideoData *)SDL_GetVideoDevice()->driverdata)->display;
 }

 static Cursor
 X11_CreateEmptyCursor()
 {
     if (x11_empty_cursor == None) {
         Display *display = GetDisplay();
         char data[1];
         XColor color;
         Pixmap pixmap;

         SDL_zero(data);
         color.red = color.green = color.blue = 0;
         pixmap = XCreateBitmapFromData(display, DefaultRootWindow(display),
                                        data, 1, 1);
         if (pixmap) {
             x11_empty_cursor = XCreatePixmapCursor(display, pixmap, pixmap,
                                                    &color, &color, 0, 0);
             XFreePixmap(display, pixmap);
         }
     }
     return x11_empty_cursor;
 }

 static void
 X11_DestroyEmptyCursor(void)
 {
     if (x11_empty_cursor != None) {
         XFreeCursor(GetDisplay(), x11_empty_cursor);
         x11_empty_cursor = None;
     }
 }

 static SDL_Cursor *
 X11_CreateDefaultCursor()
 {
     SDL_Cursor *cursor;

     cursor = SDL_calloc(1, sizeof(*cursor));
     if (cursor) {
         /* None is used to indicate the default cursor */
         cursor->driverdata = (void*)None;
     } else {
         SDL_OutOfMemory();
     }

     return cursor;
 }

 #if SDL_VIDEO_DRIVER_X11_XCURSOR
 static Cursor
 X11_CreateXCursorCursor(SDL_Surface * surface, int hot_x, int hot_y)
 {
     Display *display = GetDisplay();
     Cursor cursor = None;
     XcursorImage *image;

     image = XcursorImageCreate(surface->w, surface->h);
     if (!image) {
         SDL_OutOfMemory();
         return None;
     }
     image->xhot = hot_x;
     image->yhot = hot_y;
     image->delay = 0;

     SDL_assert(surface->format->format == SDL_PIXELFORMAT_ARGB8888);
     SDL_assert(surface->pitch == surface->w * 4);
     SDL_memcpy(image->pixels, surface->pixels, surface->h * surface->pitch);

     cursor = XcursorImageLoadCursor(display, image);

     XcursorImageDestroy(image);

     return cursor;
 }
 #endif /* SDL_VIDEO_DRIVER_X11_XCURSOR */

 static Cursor
 X11_CreatePixmapCursor(SDL_Surface * surface, int hot_x, int hot_y)
 {
     Display *display = GetDisplay();
     XColor fg, bg;
     Cursor cursor = None;
     Uint32 *ptr;
     Uint8 *data_bits, *mask_bits;
     Pixmap data_pixmap, mask_pixmap;
     int x, y;
     unsigned int rfg, gfg, bfg, rbg, gbg, bbg, fgBits, bgBits;
     unsigned int width_bytes = ((surface->w + 7) & ~7) / 8;

     data_bits = SDL_calloc(1, surface->h * width_bytes);
     mask_bits = SDL_calloc(1, surface->h * width_bytes);
     if (!data_bits || !mask_bits) {
         SDL_OutOfMemory();
         return None;
     }

     /* Code below assumes ARGB pixel format */
     SDL_assert(surface->format->format == SDL_PIXELFORMAT_ARGB8888);

     rfg = gfg = bfg = rbg = gbg = bbg = fgBits = 0;
     for (y = 0; y < surface->h; ++y) {
         ptr = (Uint32 *)((Uint8 *)surface->pixels + y * surface->pitch);
         for (x = 0; x < surface->w; ++x) {
             int alpha = (*ptr >> 24) & 0xff;
             int red   = (*ptr >> 16) & 0xff;
             int green = (*ptr >> 8) & 0xff;
             int blue  = (*ptr >> 0) & 0xff;
             if (alpha > 25) {
                 mask_bits[y * width_bytes + x / 8] |= (0x01 << (x % 8));

                 if ((red + green + blue) > 0x40) {
                     fgBits++;
                     rfg += red;
                     gfg += green;
                     bfg += blue;
                     data_bits[y * width_bytes + x / 8] |= (0x01 << (x % 8));
                 } else {
                     bgBits++;
                     rbg += red;
                     gbg += green;
                     bbg += blue;
                 }
             }
             ++ptr;
         }
     }

     if (fgBits) {
         fg.red   = rfg * 257 / fgBits;
         fg.green = gfg * 257 / fgBits;
         fg.blue  = bfg * 257 / fgBits;
     }
     else fg.red = fg.green = fg.blue = 0;

     if (bgBits) {
         bg.red   = rbg * 257 / bgBits;
         bg.green = gbg * 257 / bgBits;
         bg.blue  = bbg * 257 / bgBits;
     }
     else bg.red = bg.green = bg.blue = 0;

     data_pixmap = XCreateBitmapFromData(display, DefaultRootWindow(display),
                                         (char*)data_bits,
                                         surface->w, surface->h);
     mask_pixmap = XCreateBitmapFromData(display, DefaultRootWindow(display),
                                         (char*)mask_bits,
                                         surface->w, surface->h);
     cursor = XCreatePixmapCursor(display, data_pixmap, mask_pixmap,
                                  &fg, &bg, hot_x, hot_y);
 	XFreePixmap(display, data_pixmap);
 	XFreePixmap(display, mask_pixmap);

     return cursor;
 }

 static SDL_Cursor *
 X11_CreateCursor(SDL_Surface * surface, int hot_x, int hot_y)
 {
     SDL_Cursor *cursor;

     cursor = SDL_calloc(1, sizeof(*cursor));
     if (cursor) {
         Cursor x11_cursor = None;

 #if SDL_VIDEO_DRIVER_X11_XCURSOR
         if (SDL_X11_HAVE_XCURSOR) {
             x11_cursor = X11_CreateXCursorCursor(surface, hot_x, hot_y);
         }
 #endif
         if (x11_cursor == None) {
             x11_cursor = X11_CreatePixmapCursor(surface, hot_x, hot_y);
         }
         cursor->driverdata = (void*)x11_cursor;
     } else {
         SDL_OutOfMemory();
     }

     return cursor;
 }

 static void
 X11_FreeCursor(SDL_Cursor * cursor)
 {
     Cursor x11_cursor = (Cursor)cursor->driverdata;

     if (x11_cursor != None) {
         XFreeCursor(GetDisplay(), x11_cursor);
     }
     SDL_free(cursor);
 }

 static int
 X11_ShowCursor(SDL_Cursor * cursor)
 {
     Cursor x11_cursor = 0;

     if (cursor) {
         x11_cursor = (Cursor)cursor->driverdata;
     } else {
         x11_cursor = X11_CreateEmptyCursor();
     }

     /* FIXME: Is there a better way than this? */
     {
         SDL_VideoDevice *video = SDL_GetVideoDevice();
         Display *display = GetDisplay();
         SDL_Window *window;
         SDL_WindowData *data;

         for (window = video->windows; window; window = window->next) {
             data = (SDL_WindowData *)window->driverdata;
             if (x11_cursor != None) {
                 XDefineCursor(display, data->xwindow, x11_cursor);
             } else {
                 XUndefineCursor(display, data->xwindow);
             }
         }
         XFlush(display);
     }
     return 0;
 }

 static void
 X11_WarpMouse(SDL_Window * window, int x, int y)
 {
     SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
     Display *display = data->videodata->display;

     XWarpPointer(display, None, data->xwindow, 0, 0, 0, 0, x, y);
     XSync(display, False);
 }

 static int
 X11_SetRelativeMouseMode(SDL_bool enabled)
 {
     SDL_Unsupported();
     return -1;
 }

 void
 X11_InitMouse(_THIS)
 {
     SDL_Mouse *mouse = SDL_GetMouse();

     mouse->CreateCursor = X11_CreateCursor;
     mouse->ShowCursor = X11_ShowCursor;
     mouse->FreeCursor = X11_FreeCursor;
     mouse->WarpMouse = X11_WarpMouse;
     mouse->SetRelativeMouseMode = X11_SetRelativeMouseMode;

     SDL_SetDefaultCursor(X11_CreateDefaultCursor());
 }

 void
 X11_QuitMouse(_THIS)
 {
     X11_DestroyEmptyCursor();
 }

 #endif /* SDL_VIDEO_DRIVER_X11 */

 /* vi: set ts=4 sw=4 expandtab: */
	/*
	Simple DirectMedia Layer
	Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>

	This software is provided 'as-is', without any express or implied
	warranty. In no event will the authors be held liable for any damages
	arising from the use of this software.

	Permission is granted to anyone to use this software for any purpose,
	including commercial applications, and to alter it and redistribute it
	freely, subject to the following restrictions:

	1. The origin of this software must not be misrepresented; you must not
	claim that you wrote the original software. If you use this software
	in a product, an acknowledgment in the product documentation would be
	appreciated but is not required.
	2. Altered source versions must be plainly marked as such, and must not be
	misrepresented as being the original software.
	3. This notice may not be removed or altered from any source distribution.
	*/
	#include "SDL_config.h"

	#if SDL_VIDEO_DRIVER_X11

	#include "SDL_assert.h"
	#include "SDL_x11video.h"
	#include "SDL_x11mouse.h"
	#include "../../events/SDL_mouse_c.h"


	/* FIXME: Find a better place to put this... */
	static Cursor x11_empty_cursor = None;

	static Display *
	GetDisplay(void)
	{
	return ((SDL_VideoData *)SDL_GetVideoDevice()->driverdata)->display;
	}

	static Cursor
	X11_CreateEmptyCursor()
	{
	if (x11_empty_cursor == None) {
	Display *display = GetDisplay();
	char data[1];
	XColor color;
	Pixmap pixmap;

	SDL_zero(data);
	color.red = color.green = color.blue = 0;
	pixmap = XCreateBitmapFromData(display, DefaultRootWindow(display),
	data, 1, 1);
	if (pixmap) {
	x11_empty_cursor = XCreatePixmapCursor(display, pixmap, pixmap,
	&color, &color, 0, 0);
	XFreePixmap(display, pixmap);
	}
	}
	return x11_empty_cursor;
	}

	static void
	X11_DestroyEmptyCursor(void)
	{
	if (x11_empty_cursor != None) {
	XFreeCursor(GetDisplay(), x11_empty_cursor);
	x11_empty_cursor = None;
	}
	}

	static SDL_Cursor *
	X11_CreateDefaultCursor()
	{
	SDL_Cursor *cursor;

	cursor = SDL_calloc(1, sizeof(*cursor));
	if (cursor) {
	/* None is used to indicate the default cursor */
	cursor->driverdata = (void*)None;
	} else {
	SDL_OutOfMemory();
	}

	return cursor;
	}

	#if SDL_VIDEO_DRIVER_X11_XCURSOR
	static Cursor
	X11_CreateXCursorCursor(SDL_Surface * surface, int hot_x, int hot_y)
	{
	Display *display = GetDisplay();
	Cursor cursor = None;
	XcursorImage *image;

	image = XcursorImageCreate(surface->w, surface->h);
	if (!image) {
	SDL_OutOfMemory();
	return None;
	}
	image->xhot = hot_x;
	image->yhot = hot_y;
	image->delay = 0;

	SDL_assert(surface->format->format == SDL_PIXELFORMAT_ARGB8888);
	SDL_assert(surface->pitch == surface->w * 4);
	SDL_memcpy(image->pixels, surface->pixels, surface->h * surface->pitch);

	cursor = XcursorImageLoadCursor(display, image);

	XcursorImageDestroy(image);

	return cursor;
	}
	#endif /* SDL_VIDEO_DRIVER_X11_XCURSOR */

	static Cursor
	X11_CreatePixmapCursor(SDL_Surface * surface, int hot_x, int hot_y)
	{
	Display *display = GetDisplay();
	XColor fg, bg;
	Cursor cursor = None;
	Uint32 *ptr;
	Uint8 data_bits, mask_bits;
	Pixmap data_pixmap, mask_pixmap;
	int x, y;
	unsigned int rfg, gfg, bfg, rbg, gbg, bbg, fgBits, bgBits;
	unsigned int width_bytes = ((surface->w + 7) & ~7) / 8;

	data_bits = SDL_calloc(1, surface->h * width_bytes);
	mask_bits = SDL_calloc(1, surface->h * width_bytes);
	if (!data_bits \|\| !mask_bits) {
	SDL_OutOfMemory();
	return None;
	}

	/* Code below assumes ARGB pixel format */
	SDL_assert(surface->format->format == SDL_PIXELFORMAT_ARGB8888);

	rfg = gfg = bfg = rbg = gbg = bbg = fgBits = 0;
	for (y = 0; y < surface->h; ++y) {
	ptr = (Uint32 )((Uint8 )surface->pixels + y * surface->pitch);
	for (x = 0; x < surface->w; ++x) {
	int alpha = (*ptr >> 24) & 0xff;
	int red = (*ptr >> 16) & 0xff;
	int green = (*ptr >> 8) & 0xff;
	int blue = (*ptr >> 0) & 0xff;
	if (alpha > 25) {
	mask_bits[y * width_bytes + x / 8] \|= (0x01 << (x % 8));

	if ((red + green + blue) > 0x40) {
	fgBits++;
	rfg += red;
	gfg += green;
	bfg += blue;
	data_bits[y * width_bytes + x / 8] \|= (0x01 << (x % 8));
	} else {
	bgBits++;
	rbg += red;
	gbg += green;
	bbg += blue;
	}
	}
	++ptr;
	}
	}

	if (fgBits) {
	fg.red = rfg * 257 / fgBits;
	fg.green = gfg * 257 / fgBits;
	fg.blue = bfg * 257 / fgBits;
	}
	else fg.red = fg.green = fg.blue = 0;

	if (bgBits) {
	bg.red = rbg * 257 / bgBits;
	bg.green = gbg * 257 / bgBits;
	bg.blue = bbg * 257 / bgBits;
	}
	else bg.red = bg.green = bg.blue = 0;

	data_pixmap = XCreateBitmapFromData(display, DefaultRootWindow(display),
	(char*)data_bits,
	surface->w, surface->h);
	mask_pixmap = XCreateBitmapFromData(display, DefaultRootWindow(display),
	(char*)mask_bits,
	surface->w, surface->h);
	cursor = XCreatePixmapCursor(display, data_pixmap, mask_pixmap,
	&fg, &bg, hot_x, hot_y);
	XFreePixmap(display, data_pixmap);
	XFreePixmap(display, mask_pixmap);

	return cursor;
	}

	static SDL_Cursor *
	X11_CreateCursor(SDL_Surface * surface, int hot_x, int hot_y)
	{
	SDL_Cursor *cursor;

	cursor = SDL_calloc(1, sizeof(*cursor));
	if (cursor) {
	Cursor x11_cursor = None;

	#if SDL_VIDEO_DRIVER_X11_XCURSOR
	if (SDL_X11_HAVE_XCURSOR) {
	x11_cursor = X11_CreateXCursorCursor(surface, hot_x, hot_y);
	}
	#endif
	if (x11_cursor == None) {
	x11_cursor = X11_CreatePixmapCursor(surface, hot_x, hot_y);
	}
	cursor->driverdata = (void*)x11_cursor;
	} else {
	SDL_OutOfMemory();
	}

	return cursor;
	}

	static void
	X11_FreeCursor(SDL_Cursor * cursor)
	{
	Cursor x11_cursor = (Cursor)cursor->driverdata;

	if (x11_cursor != None) {
	XFreeCursor(GetDisplay(), x11_cursor);
	}
	SDL_free(cursor);
	}

	static int
	X11_ShowCursor(SDL_Cursor * cursor)
	{
	Cursor x11_cursor = 0;

	if (cursor) {
	x11_cursor = (Cursor)cursor->driverdata;
	} else {
	x11_cursor = X11_CreateEmptyCursor();
	}

	/* FIXME: Is there a better way than this? */
	{
	SDL_VideoDevice *video = SDL_GetVideoDevice();
	Display *display = GetDisplay();
	SDL_Window *window;
	SDL_WindowData *data;

	for (window = video->windows; window; window = window->next) {
	data = (SDL_WindowData *)window->driverdata;
	if (x11_cursor != None) {
	XDefineCursor(display, data->xwindow, x11_cursor);
	} else {
	XUndefineCursor(display, data->xwindow);
	}
	}
	XFlush(display);
	}
	return 0;
	}

	static void
	X11_WarpMouse(SDL_Window * window, int x, int y)
	{
	SDL_WindowData data = (SDL_WindowData ) window->driverdata;
	Display *display = data->videodata->display;

	XWarpPointer(display, None, data->xwindow, 0, 0, 0, 0, x, y);
	XSync(display, False);
	}

	static int
	X11_SetRelativeMouseMode(SDL_bool enabled)
	{
	SDL_Unsupported();
	return -1;
	}

	void
	X11_InitMouse(_THIS)
	{
	SDL_Mouse *mouse = SDL_GetMouse();

	mouse->CreateCursor = X11_CreateCursor;
	mouse->ShowCursor = X11_ShowCursor;
	mouse->FreeCursor = X11_FreeCursor;
	mouse->WarpMouse = X11_WarpMouse;
	mouse->SetRelativeMouseMode = X11_SetRelativeMouseMode;

	SDL_SetDefaultCursor(X11_CreateDefaultCursor());
	}

	void
	X11_QuitMouse(_THIS)
	{
	X11_DestroyEmptyCursor();
	}

	#endif /* SDL_VIDEO_DRIVER_X11 */

	/* vi: set ts=4 sw=4 expandtab: */