distrib/sdl-1.2.12/src/video/riscos/SDL_wimpvideo.c - platform/external/qemu - Gitiles

 /*
     SDL - Simple DirectMedia Layer
     Copyright (C) 1997-2004 Sam Lantinga

     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

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

 /*
      File added by Alan Buckley (alan_baa@hotmail.com) for RISC OS compatability
 	 27 March 2003

      Implements RISC OS Wimp display.
 */

 #include "SDL_video.h"
 #include "SDL_mouse.h"
 #include "../SDL_sysvideo.h"
 #include "../SDL_pixels_c.h"
 #include "../../events/SDL_events_c.h"

 #include "SDL_riscostask.h"
 #include "SDL_riscosvideo.h"
 #include "SDL_riscosevents_c.h"
 #include "SDL_riscosmouse_c.h"

 #include "kernel.h"
 #include "swis.h"

 /* Initialization/Query functions */
 SDL_Rect **WIMP_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);
 SDL_Surface *WIMP_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);
 int WIMP_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);
 void WIMP_SetWMCaption(_THIS, const char *title, const char *icon);


 extern unsigned char *WIMP_CreateBuffer(int width, int height, int bpp);
 extern void WIMP_PumpEvents(_THIS);
 extern void WIMP_PlotSprite(_THIS, int x, int y);
 extern void WIMP_SetupPlotInfo(_THIS);
 extern void WIMP_SetFocus(int win);

 /* etc. */
 static void WIMP_UpdateRects(_THIS, int numrects, SDL_Rect *rects);

 /* RISC OS Wimp handling helpers */
 void WIMP_ReadModeInfo(_THIS);
 unsigned int WIMP_SetupWindow(_THIS, SDL_Surface *surface);
 void WIMP_SetDeviceMode(_THIS);
 void WIMP_DeleteWindow(_THIS);

 /* FULLSCREEN function required for wimp/fullscreen toggling */
 extern int FULLSCREEN_SetMode(int width, int height, int bpp);

 /* Currently need to set this up here as it only works if you
    start up in a Wimp mode */
 extern int RISCOS_ToggleFullScreen(_THIS, int fullscreen);

 extern int riscos_backbuffer;
 extern int mouseInWindow;
 extern int riscos_closeaction;

 /* Following needed to ensure window is shown immediately */
 extern int hasFocus;
 extern void WIMP_Poll(_THIS, int waitTime);

 SDL_Surface *WIMP_SetVideoMode(_THIS, SDL_Surface *current,
 				int width, int height, int bpp, Uint32 flags)
 {
    Uint32 Rmask = 0;
    Uint32 Gmask = 0;
    Uint32 Bmask = 0;
    char *buffer = NULL;
    int bytesPerPixel = 1;

    /* Don't support double buffering in Wimp mode */
    flags &= ~SDL_DOUBLEBUF;
    flags &= ~SDL_HWSURFACE;

    switch(bpp)
    {
 	case 8:
 		/* Emulated palette using ColourTrans */
 		flags |= SDL_HWPALETTE;
 		break;

 	case 15:
 	case 16:
 		Bmask = 0x00007c00;
 		Gmask = 0x000003e0;
 		Rmask = 0x0000001f;
 		bytesPerPixel = 2;
 		break;

 	case 32:
 		Bmask = 0x00ff0000;
 		Gmask = 0x0000ff00;
 		Rmask = 0x000000ff;
 		bytesPerPixel = 4;
 		break;

 	default:
 		SDL_SetError("Pixel depth not supported");
 		return NULL;
 		break;
    }

 /* 	printf("Setting mode %dx%d\n", width, height);*/

 	/* Allocate the new pixel format for the screen */
 	if ( ! SDL_ReallocFormat(current, bpp, Rmask, Gmask, Bmask, 0) ) {
 		SDL_SetError("Couldn't allocate new pixel format for requested mode");
 		return(NULL);
 	}

 	/* Set up the new mode framebuffer */
 	current->w = width;
 	this->hidden->height = current->h = height;

 	if (bpp == 15) bpp = 16;
 	buffer = WIMP_CreateBuffer(width, height, bpp);
 	if (buffer == NULL)
 	{
 		SDL_SetError("Couldn't create sprite for video memory");
 		return (NULL);
 	}

 	this->hidden->bank[0] = buffer + 60; /* Start of sprite data */
 	if (bpp == 8) this->hidden->bank[0] += 2048; /* 8bpp sprite have palette first */

 	this->hidden->bank[1] = buffer;      /* Start of buffer */

 	/* Remember sprite buffer so it can be freed later */
 	if (this->hidden->alloc_bank) SDL_free(this->hidden->alloc_bank);
 	this->hidden->alloc_bank = buffer;

 	current->pitch = width * bytesPerPixel;
 	if ((current->pitch & 3))
 	{
 		/* Sprites are 32bit word aligned */
 		current->pitch += (4 - (current->pitch & 3));
 	}

   	current->flags = flags | SDL_PREALLOC;

 	WIMP_ReadModeInfo(this);

     SDL_memset(this->hidden->bank[0], 0, height * current->pitch);

 	this->hidden->current_bank = 0;
 	current->pixels = this->hidden->bank[0];


 	if (WIMP_SetupWindow(this, current) == 0)
 	{
 		SDL_SetError("Unable to create window to display surface");
 		return NULL;
 	}

 	/* Reset device functions for the wimp */
 	WIMP_SetDeviceMode(this);

 	/* Needs to set up plot info after window has been created */
 	/* Not sure why, but plots don't work if I do it earlier */
 	WIMP_SetupPlotInfo(this);

 	/* Poll until window is shown */
 	{
 	   /* We wait until it gets the focus, but give up after 5 seconds
 	      in case the focus is prevented in any way.
 	   */
 	   Uint32 now = SDL_GetTicks();
 	   while (!hasFocus && SDL_GetTicks() - now < 5000)
 	   {
 	      WIMP_Poll(this, 0);
 	   }
 	}

 	/* We're done */
 	return(current);
 }


 void WIMP_ReadModeInfo(_THIS)
 {
 	_kernel_swi_regs regs;
 	int vars[6];
 	int vals[5];

 	vars[0] = 4;  /* XEig */
 	vars[1] = 5;  /* YEig */
 	vars[2] = 9;  /* Log base 2 bpp */
 	vars[3] = 11; /* Screen Width - 1 */
 	vars[4] = 12; /* Screen Depth - 1 */
 	vars[5] = -1; /* Terminate list */

 	regs.r[0] = (int)vars;
 	regs.r[1] = (int)vals;
 	_kernel_swi(OS_ReadVduVariables, &regs, &regs);
 	this->hidden->xeig = vals[0];
 	this->hidden->yeig = vals[1];
 	this->hidden->screen_bpp = 1 << vals[2];
 	this->hidden->screen_width = vals[3] + 1;
 	this->hidden->screen_height = vals[4] + 1;
 }

 /* Set device function to call the correct versions for running
    in a wimp window */

 void WIMP_SetDeviceMode(_THIS)
 {
 	if (this->UpdateRects == WIMP_UpdateRects) return; /* Already set up */

 	this->SetColors   = WIMP_SetColors;
 	this->UpdateRects = WIMP_UpdateRects;

 	this->FlipHWSurface = NULL;

 	this->SetCaption = WIMP_SetWMCaption;
 	this->SetIcon = NULL;
 	this->IconifyWindow = NULL;

 	this->ShowWMCursor = WIMP_ShowWMCursor;
 	this->WarpWMCursor = WIMP_WarpWMCursor;

         this->ToggleFullScreen = RISCOS_ToggleFullScreen;

 	this->PumpEvents = WIMP_PumpEvents;
 }

 /* Setup the Window to display the surface */
 unsigned int WIMP_SetupWindow(_THIS, SDL_Surface *surface)
 {
 	_kernel_swi_regs regs;
 	int window_data[23];
     int	*window_block = window_data+1;
 	int x = (this->hidden->screen_width - surface->w) / 2;
 	int y = (this->hidden->screen_height - surface->h) / 2;
 	int xeig = this->hidden->xeig;
 	int yeig = this->hidden->yeig;

     mouseInWindow = 0;

 	/* Always delete the window and recreate on a change */
 	if (this->hidden->window_handle) WIMP_DeleteWindow(this);

 	/* Setup window co-ordinates */
    window_block[0] = x << xeig;
    window_block[1] = y << yeig;
    window_block[2] = window_block[0] + (surface->w << xeig);
    window_block[3] = window_block[1] + (surface->h << yeig);


    window_block[4] = 0;				  /* Scroll offsets */
    window_block[5] = 0;
    window_block[6] = -1;			  /* Open on top of window stack */

    window_block[7] = 0x85040042;      /* Window flags */
    if (riscos_closeaction != 0) window_block[7] |= 0x2000000;

    /* TODO: Take into account surface->flags */

    window_block[8] = 0xff070207;      /* Window colours */
    window_block[9] = 0x000c0103;
    window_block[10] = 0;                    /* Work area minimum */
    window_block[11] = -surface->h << yeig;
    window_block[12] = surface->w << xeig;   /* Work area maximum */
    window_block[13] = 0;
    window_block[14] = 0x2700013d;    /* Title icon flags */
    window_block[15] = 0x00003000;	 /* Work area flags - Mouse click down reported */
    window_block[16] = 1;             /* Sprite area control block pointer */
    window_block[17] = 0x00100010;	 /* Minimum window size (width & height) (16x16)*/
    window_block[18] = (int)this->hidden->title;    /* Title data */
    window_block[19] = -1;
    window_block[20] = 256;
    window_block[21] = 0;			 /* Number of icons */

    regs.r[1] = (unsigned int)(window_block);

    /* Create the window */
    if (_kernel_swi(Wimp_CreateWindow, &regs, &regs) == NULL)
    {
 	   this->hidden->window_handle = window_data[0] = regs.r[0];

 	   /* Show the window on the screen */
 	   regs.r[1] = (unsigned int)window_data;
        if (_kernel_swi(Wimp_OpenWindow, &regs, &regs) == NULL)
        {
           WIMP_SetFocus(this->hidden->window_handle);
        } else
        {
 		  WIMP_DeleteWindow(this);
 	   }
    }

    return this->hidden->window_handle;
 }

 /* Destroy the Window */

 void WIMP_DeleteWindow(_THIS)
 {
 	_kernel_swi_regs regs;
     regs.r[1] = (unsigned int)&(this->hidden->window_handle);
 	_kernel_swi(Wimp_DeleteWindow, &regs, &regs);
 	this->hidden->window_handle = 0;
 }


 void WIMP_UpdateRects(_THIS, int numrects, SDL_Rect *rects)
 {
 	_kernel_swi_regs regs;
 	int update_block[12];
 	int xeig = this->hidden->xeig;
 	int yeig = this->hidden->yeig;
 	int j;
 	update_block[0] = this->hidden->window_handle;

 	for (j = 0; j < numrects; j++)
 	{
 		update_block[1] = rects[j].x << xeig; /* Min X */
 		update_block[4] = -(rects[j].y << yeig);
 		update_block[3] = update_block[1] + (rects[j].w << xeig);
 		update_block[2] = update_block[4] - (rects[j].h << yeig);

 		regs.r[1] = (int)update_block;
 		/* Update window can fail if called before first poll */
 		if (_kernel_swi(Wimp_UpdateWindow, &regs, &regs) == 0)
 		{
 			while (regs.r[0])
 			{
 				WIMP_PlotSprite(this, update_block[1], update_block[2]);
 				_kernel_swi(Wimp_GetRectangle, &regs, &regs);
 			}
 		}
 	}
 }


 int WIMP_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)
 {
    unsigned int *pal = (unsigned int *)(this->hidden->bank[1]+60);
    int j;
    SDL_Rect update;

    pal += firstcolor*2;
    for (j = 0; j < ncolors; j++)
    {
       *pal = (((unsigned int)colors->r) << 8)
              + (((unsigned int)colors->g) << 16)
              + (((unsigned int)colors->b) << 24);
       pal[1] = *pal;
       pal += 2;
       colors++;
    }

    WIMP_SetupPlotInfo(this);

    /* Need to refresh the window */
    update.x = 0;
    update.y = 0;
    update.w = SDL_VideoSurface->w;
    update.h = SDL_VideoSurface->h;
    WIMP_UpdateRects(this, 1, &update);

 	return 1;
 }

 void WIMP_SetWMCaption(_THIS, const char *title, const char *icon)
 {
 	_kernel_swi_regs regs;

 	SDL_strlcpy(this->hidden->title, title, SDL_arraysize(this->hidden->title));

 	if (RISCOS_GetWimpVersion() < 380)
 	{
 		int block[6];

 		regs.r[1] = (int)block;
 		_kernel_swi(Wimp_GetCaretPosition, &regs, &regs);
 		if (block[0] == (int)this->hidden->window_handle)
 		{
 			regs.r[0] = -1;
 			_kernel_swi(Wimp_SetCaretPosition, &regs,&regs);
 		} else
 		{
 			regs.r[0] = this->hidden->window_handle;
 			regs.r[1] = -1;
 			regs.r[2] = -1;
 			regs.r[3] = -1;
 			_kernel_swi(Wimp_SetCaretPosition, &regs,&regs);
 		}
 		regs.r[0] = block[0];
 		regs.r[1] = block[1];
 		regs.r[2] = block[2];
 		regs.r[3] = block[3];
 		regs.r[4] = block[4];
 		regs.r[5] = block[5];
 		_kernel_swi(Wimp_SetCaretPosition, &regs,&regs);
 	} else
 	{
 		regs.r[0] = this->hidden->window_handle;
 		regs.r[1] = 0x4b534154; /* "TASK" */
 		regs.r[2] = 3; /* Redraw title */
 		_kernel_swi(Wimp_ForceRedraw, &regs, &regs);
 	}
 }

 void WIMP_RefreshDesktop(_THIS)
 {
    int width = this->hidden->screen_width << this->hidden->xeig;
    int height = this->hidden->screen_height << this->hidden->yeig;
    _kernel_swi_regs regs;
    regs.r[0] = -1; /* Whole screen */
    regs.r[1] = 0;
    regs.r[2] = 0;
    regs.r[3] = width;
    regs.r[4] = height;
    _kernel_swi(Wimp_ForceRedraw, &regs, &regs);
 }

 /* Toggle to window from full screen */
 int WIMP_ToggleFromFullScreen(_THIS)
 {
    int width = this->screen->w;
    int height = this->screen->h;
    int bpp = this->screen->format->BitsPerPixel;
    char *buffer = NULL;
    char *old_bank[2];
    char *old_alloc_bank;

    /* Ensure flags are OK */
    this->screen->flags &= ~(SDL_DOUBLEBUF|SDL_HWSURFACE);

    if (this->hidden->bank[0] == this->hidden->alloc_bank || riscos_backbuffer == 0)
    {
       /* Need to create a sprite for the screen and copy the data to it */
       char *data;
       buffer = WIMP_CreateBuffer(width, height, bpp);
       data = buffer + 60;         /* Start of sprite data */
       if (bpp == 8) data += 2048;  /* 8bpp sprite have palette first */

       if (buffer == NULL) return 0;
       SDL_memcpy(data, this->hidden->bank[0], width * height * this->screen->format->BytesPerPixel);
    }
    /* else We've switch to full screen before so we already have a sprite */

    old_bank[0] = this->hidden->bank[0];
    old_bank[1] = this->hidden->bank[1];
    old_alloc_bank = this->hidden->alloc_bank;

    if (buffer != NULL) this->hidden->alloc_bank = buffer;

    this->hidden->bank[1] = this->hidden->alloc_bank;
    this->hidden->bank[0] = this->hidden->bank[1] + 60; /* Start of sprite data */
    if (bpp == 8) this->hidden->bank[0] += 2048; /* 8bpp sprite have palette first */

    this->hidden->current_bank = 0;
    this->screen->pixels = this->hidden->bank[0];

    RISCOS_RestoreWimpMode();
    WIMP_ReadModeInfo(this);
    if (WIMP_SetupWindow(this, this->screen))
    {
       WIMP_SetDeviceMode(this);
       WIMP_SetupPlotInfo(this);

       if (riscos_backbuffer == 0) riscos_backbuffer = 1;

       if (buffer && old_alloc_bank) SDL_free(old_alloc_bank);

       return 1;
    } else
    {
       /* Drop back to full screen mode on failure */
       this->hidden->bank[0] = old_bank[0];
       this->hidden->bank[1] = old_bank[1];
       this->hidden->alloc_bank = old_alloc_bank;
       if (buffer) SDL_free(buffer);

       RISCOS_StoreWimpMode();
       FULLSCREEN_SetMode(width, height, bpp);
    }

    return 0;
 }
	/*
	SDL - Simple DirectMedia Layer
	Copyright (C) 1997-2004 Sam Lantinga

	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

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

	/*
	File added by Alan Buckley (alan_baa@hotmail.com) for RISC OS compatability
	27 March 2003

	Implements RISC OS Wimp display.
	*/

	#include "SDL_video.h"
	#include "SDL_mouse.h"
	#include "../SDL_sysvideo.h"
	#include "../SDL_pixels_c.h"
	#include "../../events/SDL_events_c.h"

	#include "SDL_riscostask.h"
	#include "SDL_riscosvideo.h"
	#include "SDL_riscosevents_c.h"
	#include "SDL_riscosmouse_c.h"

	#include "kernel.h"
	#include "swis.h"

	/* Initialization/Query functions */
	SDL_Rect *WIMP_ListModes(_THIS, SDL_PixelFormat format, Uint32 flags);
	SDL_Surface WIMP_SetVideoMode(_THIS, SDL_Surface current, int width, int height, int bpp, Uint32 flags);
	int WIMP_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);
	void WIMP_SetWMCaption(_THIS, const char title, const char icon);


	extern unsigned char *WIMP_CreateBuffer(int width, int height, int bpp);
	extern void WIMP_PumpEvents(_THIS);
	extern void WIMP_PlotSprite(_THIS, int x, int y);
	extern void WIMP_SetupPlotInfo(_THIS);
	extern void WIMP_SetFocus(int win);

	/* etc. */
	static void WIMP_UpdateRects(_THIS, int numrects, SDL_Rect *rects);

	/* RISC OS Wimp handling helpers */
	void WIMP_ReadModeInfo(_THIS);
	unsigned int WIMP_SetupWindow(_THIS, SDL_Surface *surface);
	void WIMP_SetDeviceMode(_THIS);
	void WIMP_DeleteWindow(_THIS);

	/* FULLSCREEN function required for wimp/fullscreen toggling */
	extern int FULLSCREEN_SetMode(int width, int height, int bpp);

	/* Currently need to set this up here as it only works if you
	start up in a Wimp mode */
	extern int RISCOS_ToggleFullScreen(_THIS, int fullscreen);

	extern int riscos_backbuffer;
	extern int mouseInWindow;
	extern int riscos_closeaction;

	/* Following needed to ensure window is shown immediately */
	extern int hasFocus;
	extern void WIMP_Poll(_THIS, int waitTime);

	SDL_Surface WIMP_SetVideoMode(_THIS, SDL_Surface current,
	int width, int height, int bpp, Uint32 flags)
	{
	Uint32 Rmask = 0;
	Uint32 Gmask = 0;
	Uint32 Bmask = 0;
	char *buffer = NULL;
	int bytesPerPixel = 1;

	/* Don't support double buffering in Wimp mode */
	flags &= ~SDL_DOUBLEBUF;
	flags &= ~SDL_HWSURFACE;

	switch(bpp)
	{
	case 8:
	/* Emulated palette using ColourTrans */
	flags \|= SDL_HWPALETTE;
	break;

	case 15:
	case 16:
	Bmask = 0x00007c00;
	Gmask = 0x000003e0;
	Rmask = 0x0000001f;
	bytesPerPixel = 2;
	break;

	case 32:
	Bmask = 0x00ff0000;
	Gmask = 0x0000ff00;
	Rmask = 0x000000ff;
	bytesPerPixel = 4;
	break;

	default:
	SDL_SetError("Pixel depth not supported");
	return NULL;
	break;
	}

	/* printf("Setting mode %dx%d\n", width, height);*/

	/* Allocate the new pixel format for the screen */
	if ( ! SDL_ReallocFormat(current, bpp, Rmask, Gmask, Bmask, 0) ) {
	SDL_SetError("Couldn't allocate new pixel format for requested mode");
	return(NULL);
	}

	/* Set up the new mode framebuffer */
	current->w = width;
	this->hidden->height = current->h = height;

	if (bpp == 15) bpp = 16;
	buffer = WIMP_CreateBuffer(width, height, bpp);
	if (buffer == NULL)
	{
	SDL_SetError("Couldn't create sprite for video memory");
	return (NULL);
	}

	this->hidden->bank[0] = buffer + 60; /* Start of sprite data */
	if (bpp == 8) this->hidden->bank[0] += 2048; /* 8bpp sprite have palette first */

	this->hidden->bank[1] = buffer; /* Start of buffer */

	/* Remember sprite buffer so it can be freed later */
	if (this->hidden->alloc_bank) SDL_free(this->hidden->alloc_bank);
	this->hidden->alloc_bank = buffer;

	current->pitch = width * bytesPerPixel;
	if ((current->pitch & 3))
	{
	/* Sprites are 32bit word aligned */
	current->pitch += (4 - (current->pitch & 3));
	}

	current->flags = flags \| SDL_PREALLOC;

	WIMP_ReadModeInfo(this);

	SDL_memset(this->hidden->bank[0], 0, height * current->pitch);

	this->hidden->current_bank = 0;
	current->pixels = this->hidden->bank[0];


	if (WIMP_SetupWindow(this, current) == 0)
	{
	SDL_SetError("Unable to create window to display surface");
	return NULL;
	}

	/* Reset device functions for the wimp */
	WIMP_SetDeviceMode(this);

	/* Needs to set up plot info after window has been created */
	/* Not sure why, but plots don't work if I do it earlier */
	WIMP_SetupPlotInfo(this);

	/* Poll until window is shown */
	{
	/* We wait until it gets the focus, but give up after 5 seconds
	in case the focus is prevented in any way.
	*/
	Uint32 now = SDL_GetTicks();
	while (!hasFocus && SDL_GetTicks() - now < 5000)
	{
	WIMP_Poll(this, 0);
	}
	}

	/* We're done */
	return(current);
	}


	void WIMP_ReadModeInfo(_THIS)
	{
	_kernel_swi_regs regs;
	int vars[6];
	int vals[5];

	vars[0] = 4; /* XEig */
	vars[1] = 5; /* YEig */
	vars[2] = 9; /* Log base 2 bpp */
	vars[3] = 11; /* Screen Width - 1 */
	vars[4] = 12; /* Screen Depth - 1 */
	vars[5] = -1; /* Terminate list */

	regs.r[0] = (int)vars;
	regs.r[1] = (int)vals;
	_kernel_swi(OS_ReadVduVariables, &regs, &regs);
	this->hidden->xeig = vals[0];
	this->hidden->yeig = vals[1];
	this->hidden->screen_bpp = 1 << vals[2];
	this->hidden->screen_width = vals[3] + 1;
	this->hidden->screen_height = vals[4] + 1;
	}

	/* Set device function to call the correct versions for running
	in a wimp window */

	void WIMP_SetDeviceMode(_THIS)
	{
	if (this->UpdateRects == WIMP_UpdateRects) return; /* Already set up */

	this->SetColors = WIMP_SetColors;
	this->UpdateRects = WIMP_UpdateRects;

	this->FlipHWSurface = NULL;

	this->SetCaption = WIMP_SetWMCaption;
	this->SetIcon = NULL;
	this->IconifyWindow = NULL;

	this->ShowWMCursor = WIMP_ShowWMCursor;
	this->WarpWMCursor = WIMP_WarpWMCursor;

	this->ToggleFullScreen = RISCOS_ToggleFullScreen;

	this->PumpEvents = WIMP_PumpEvents;
	}

	/* Setup the Window to display the surface */
	unsigned int WIMP_SetupWindow(_THIS, SDL_Surface *surface)
	{
	_kernel_swi_regs regs;
	int window_data[23];
	int *window_block = window_data+1;
	int x = (this->hidden->screen_width - surface->w) / 2;
	int y = (this->hidden->screen_height - surface->h) / 2;
	int xeig = this->hidden->xeig;
	int yeig = this->hidden->yeig;

	mouseInWindow = 0;

	/* Always delete the window and recreate on a change */
	if (this->hidden->window_handle) WIMP_DeleteWindow(this);

	/* Setup window co-ordinates */
	window_block[0] = x << xeig;
	window_block[1] = y << yeig;
	window_block[2] = window_block[0] + (surface->w << xeig);
	window_block[3] = window_block[1] + (surface->h << yeig);


	window_block[4] = 0; /* Scroll offsets */
	window_block[5] = 0;
	window_block[6] = -1; /* Open on top of window stack */

	window_block[7] = 0x85040042; /* Window flags */
	if (riscos_closeaction != 0) window_block[7] \|= 0x2000000;

	/* TODO: Take into account surface->flags */

	window_block[8] = 0xff070207; /* Window colours */
	window_block[9] = 0x000c0103;
	window_block[10] = 0; /* Work area minimum */
	window_block[11] = -surface->h << yeig;
	window_block[12] = surface->w << xeig; /* Work area maximum */
	window_block[13] = 0;
	window_block[14] = 0x2700013d; /* Title icon flags */
	window_block[15] = 0x00003000; /* Work area flags - Mouse click down reported */
	window_block[16] = 1; /* Sprite area control block pointer */
	window_block[17] = 0x00100010; /* Minimum window size (width & height) (16x16)*/
	window_block[18] = (int)this->hidden->title; /* Title data */
	window_block[19] = -1;
	window_block[20] = 256;
	window_block[21] = 0; /* Number of icons */

	regs.r[1] = (unsigned int)(window_block);

	/* Create the window */
	if (_kernel_swi(Wimp_CreateWindow, &regs, &regs) == NULL)
	{
	this->hidden->window_handle = window_data[0] = regs.r[0];

	/* Show the window on the screen */
	regs.r[1] = (unsigned int)window_data;
	if (_kernel_swi(Wimp_OpenWindow, &regs, &regs) == NULL)
	{
	WIMP_SetFocus(this->hidden->window_handle);
	} else
	{
	WIMP_DeleteWindow(this);
	}
	}

	return this->hidden->window_handle;
	}

	/* Destroy the Window */

	void WIMP_DeleteWindow(_THIS)
	{
	_kernel_swi_regs regs;
	regs.r[1] = (unsigned int)&(this->hidden->window_handle);
	_kernel_swi(Wimp_DeleteWindow, &regs, &regs);
	this->hidden->window_handle = 0;
	}


	void WIMP_UpdateRects(_THIS, int numrects, SDL_Rect *rects)
	{
	_kernel_swi_regs regs;
	int update_block[12];
	int xeig = this->hidden->xeig;
	int yeig = this->hidden->yeig;
	int j;
	update_block[0] = this->hidden->window_handle;

	for (j = 0; j < numrects; j++)
	{
	update_block[1] = rects[j].x << xeig; /* Min X */
	update_block[4] = -(rects[j].y << yeig);
	update_block[3] = update_block[1] + (rects[j].w << xeig);
	update_block[2] = update_block[4] - (rects[j].h << yeig);

	regs.r[1] = (int)update_block;
	/* Update window can fail if called before first poll */
	if (_kernel_swi(Wimp_UpdateWindow, &regs, &regs) == 0)
	{
	while (regs.r[0])
	{
	WIMP_PlotSprite(this, update_block[1], update_block[2]);
	_kernel_swi(Wimp_GetRectangle, &regs, &regs);
	}
	}
	}
	}


	int WIMP_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)
	{
	unsigned int pal = (unsigned int )(this->hidden->bank[1]+60);
	int j;
	SDL_Rect update;

	pal += firstcolor*2;
	for (j = 0; j < ncolors; j++)
	{
	*pal = (((unsigned int)colors->r) << 8)
	+ (((unsigned int)colors->g) << 16)
	+ (((unsigned int)colors->b) << 24);
	pal[1] = *pal;
	pal += 2;
	colors++;
	}

	WIMP_SetupPlotInfo(this);

	/* Need to refresh the window */
	update.x = 0;
	update.y = 0;
	update.w = SDL_VideoSurface->w;
	update.h = SDL_VideoSurface->h;
	WIMP_UpdateRects(this, 1, &update);

	return 1;
	}

	void WIMP_SetWMCaption(_THIS, const char title, const char icon)
	{
	_kernel_swi_regs regs;

	SDL_strlcpy(this->hidden->title, title, SDL_arraysize(this->hidden->title));

	if (RISCOS_GetWimpVersion() < 380)
	{
	int block[6];

	regs.r[1] = (int)block;
	_kernel_swi(Wimp_GetCaretPosition, &regs, &regs);
	if (block[0] == (int)this->hidden->window_handle)
	{
	regs.r[0] = -1;
	_kernel_swi(Wimp_SetCaretPosition, &regs,&regs);
	} else
	{
	regs.r[0] = this->hidden->window_handle;
	regs.r[1] = -1;
	regs.r[2] = -1;
	regs.r[3] = -1;
	_kernel_swi(Wimp_SetCaretPosition, &regs,&regs);
	}
	regs.r[0] = block[0];
	regs.r[1] = block[1];
	regs.r[2] = block[2];
	regs.r[3] = block[3];
	regs.r[4] = block[4];
	regs.r[5] = block[5];
	_kernel_swi(Wimp_SetCaretPosition, &regs,&regs);
	} else
	{
	regs.r[0] = this->hidden->window_handle;
	regs.r[1] = 0x4b534154; /* "TASK" */
	regs.r[2] = 3; /* Redraw title */
	_kernel_swi(Wimp_ForceRedraw, &regs, &regs);
	}
	}

	void WIMP_RefreshDesktop(_THIS)
	{
	int width = this->hidden->screen_width << this->hidden->xeig;
	int height = this->hidden->screen_height << this->hidden->yeig;
	_kernel_swi_regs regs;
	regs.r[0] = -1; /* Whole screen */
	regs.r[1] = 0;
	regs.r[2] = 0;
	regs.r[3] = width;
	regs.r[4] = height;
	_kernel_swi(Wimp_ForceRedraw, &regs, &regs);
	}

	/* Toggle to window from full screen */
	int WIMP_ToggleFromFullScreen(_THIS)
	{
	int width = this->screen->w;
	int height = this->screen->h;
	int bpp = this->screen->format->BitsPerPixel;
	char *buffer = NULL;
	char *old_bank[2];
	char *old_alloc_bank;

	/* Ensure flags are OK */
	this->screen->flags &= ~(SDL_DOUBLEBUF\|SDL_HWSURFACE);

	if (this->hidden->bank[0] == this->hidden->alloc_bank \|\| riscos_backbuffer == 0)
	{
	/* Need to create a sprite for the screen and copy the data to it */
	char *data;
	buffer = WIMP_CreateBuffer(width, height, bpp);
	data = buffer + 60; /* Start of sprite data */
	if (bpp == 8) data += 2048; /* 8bpp sprite have palette first */

	if (buffer == NULL) return 0;
	SDL_memcpy(data, this->hidden->bank[0], width * height * this->screen->format->BytesPerPixel);
	}
	/* else We've switch to full screen before so we already have a sprite */

	old_bank[0] = this->hidden->bank[0];
	old_bank[1] = this->hidden->bank[1];
	old_alloc_bank = this->hidden->alloc_bank;

	if (buffer != NULL) this->hidden->alloc_bank = buffer;

	this->hidden->bank[1] = this->hidden->alloc_bank;
	this->hidden->bank[0] = this->hidden->bank[1] + 60; /* Start of sprite data */
	if (bpp == 8) this->hidden->bank[0] += 2048; /* 8bpp sprite have palette first */

	this->hidden->current_bank = 0;
	this->screen->pixels = this->hidden->bank[0];

	RISCOS_RestoreWimpMode();
	WIMP_ReadModeInfo(this);
	if (WIMP_SetupWindow(this, this->screen))
	{
	WIMP_SetDeviceMode(this);
	WIMP_SetupPlotInfo(this);

	if (riscos_backbuffer == 0) riscos_backbuffer = 1;

	if (buffer && old_alloc_bank) SDL_free(old_alloc_bank);

	return 1;
	} else
	{
	/* Drop back to full screen mode on failure */
	this->hidden->bank[0] = old_bank[0];
	this->hidden->bank[1] = old_bank[1];
	this->hidden->alloc_bank = old_alloc_bank;
	if (buffer) SDL_free(buffer);

	RISCOS_StoreWimpMode();
	FULLSCREEN_SetMode(width, height, bpp);
	}

	return 0;
	}