/*

    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

    Micah Dowty

    micahjd@users.sourceforge.net

*/

#include "SDL_config.h"

#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_pgvideo.h"

#include "SDL_pgevents_c.h"

#define PGVID_DRIVER_NAME "picogui"

/* Initialization/Query functions */

static int PG_VideoInit(_THIS, SDL_PixelFormat *vformat);

static SDL_Rect **PG_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);

static SDL_Surface *PG_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);

static int PG_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);

static void PG_VideoQuit(_THIS);

/* Hardware surface functions */

static int PG_AllocHWSurface(_THIS, SDL_Surface *surface);

static int PG_LockHWSurface(_THIS, SDL_Surface *surface);

static void PG_UnlockHWSurface(_THIS, SDL_Surface *surface);

static void PG_FreeHWSurface(_THIS, SDL_Surface *surface);

/* etc. */

static void PG_UpdateRects(_THIS, int numrects, SDL_Rect *rects);

// The implementation dependent data for the window manager cursor

struct WMcursor {

  /* Our cursor is a PicoGUI theme */

  pghandle theme;

} ;

/* WM functions */

void PG_SetCaption(_THIS, const char *title, const char *icon);

WMcursor * PG_CreateWMCursor (_THIS,Uint8 * data, Uint8 * mask, 

			      int w, int h, int hot_x, int hot_y);

void PG_FreeWMCursor (_THIS, WMcursor * cursor);

void PG_WarpWMCursor(_THIS, Uint16 x, Uint16 y);

int PG_ShowWMCursor (_THIS, WMcursor * cursor);

/* PicoGUI driver bootstrap functions */

static int PG_Available(void)

{

        /* FIXME: The current client lib doesn't give a way to see if the picogui

	 *        server is reachable without causing a fatal error if it isn't.

	 *        This should be fixed in cli_c2, but until then assume we can

	 *        connect. Since more common drivers like X11 are probed first anyway,

	 *        this shouldn't be a huge problem.

	 */

	return(1);

}

static void PG_DeleteDevice(SDL_VideoDevice *device)

{

	SDL_free(device->hidden);

	SDL_free(device);

}

static SDL_VideoDevice *PG_CreateDevice(int devindex)

{

	SDL_VideoDevice *device;

	/* Initialize all variables that we clean on shutdown */

	device = (SDL_VideoDevice *)SDL_malloc(sizeof(SDL_VideoDevice));

	if ( device ) {

		SDL_memset(device, 0, (sizeof *device));

		device->hidden = (struct SDL_PrivateVideoData *)

				SDL_malloc((sizeof *device->hidden));

	}

	if ( (device == NULL) || (device->hidden == NULL) ) {

		SDL_OutOfMemory();

		if ( device ) {

			SDL_free(device);

		}

		return(0);

	}

	SDL_memset(device->hidden, 0, (sizeof *device->hidden));

	/* Set the function pointers */

	device->VideoInit = PG_VideoInit;

	device->ListModes = PG_ListModes;

	device->SetVideoMode = PG_SetVideoMode;

	device->CreateYUVOverlay = NULL;

	device->SetColors = PG_SetColors;

	device->UpdateRects = PG_UpdateRects;

	device->VideoQuit = PG_VideoQuit;

	device->AllocHWSurface = PG_AllocHWSurface;

	device->CheckHWBlit = NULL;

	device->FillHWRect = NULL;

	device->SetHWColorKey = NULL;

	device->SetHWAlpha = NULL;

	device->LockHWSurface = PG_LockHWSurface;

	device->UnlockHWSurface = PG_UnlockHWSurface;

	device->FlipHWSurface = NULL;

	device->FreeHWSurface = PG_FreeHWSurface;

	device->SetCaption = PG_SetCaption;

	device->SetIcon = NULL;

	device->IconifyWindow = NULL;

	device->GrabInput = NULL;

	device->PumpEvents = PG_PumpEvents;

	device->InitOSKeymap = PG_InitOSKeymap;

	device->ShowWMCursor = PG_ShowWMCursor;

	device->CreateWMCursor = PG_CreateWMCursor;

	device->FreeWMCursor = PG_FreeWMCursor;

	device->WarpWMCursor = PG_WarpWMCursor;

	device->free = PG_DeleteDevice;

	return device;

}

VideoBootStrap PG_bootstrap = {

	PGVID_DRIVER_NAME, "PicoGUI SDL driver",

	PG_Available, PG_CreateDevice

};

int PG_VideoInit(_THIS, SDL_PixelFormat *vformat)

{

        /* Connect to the PicoGUI server. No way to process command line args yet,

	 * but since this is based on SHM it's not important to be able to specify

	 * a remote PicoGUI server.

	 *

	 * FIXME: Another nitpick about the current client lib is there's no

	 *        clean way to indicate that command line args are not available.

	 */

        pgInit(0,(char**)"");

	this->hidden->mi = *pgGetVideoMode();

	/* Create a picogui application and canvas. We'll populate the canvas later. */

	this->hidden->wApp = pgRegisterApp(PG_APP_NORMAL,"SDL",0);

	this->hidden->wCanvas = pgNewWidget(PG_WIDGET_CANVAS,0,0);

	pgSetWidget(PGDEFAULT,

		    PG_WP_SIDE, PG_S_ALL,

		    0);

	PG_InitEvents(this);

	/* Determine the current screen size */

	this->info.current_w = this->hidden->mi.lxres;

	this->info.current_h = this->hidden->mi.lyres;

	/* Determine the screen depth.

	 * We change this during the SDL_SetVideoMode implementation... 

	 * Round up to the nearest Bytes per pixel

	 */

	vformat->BitsPerPixel = this->hidden->mi.bpp;

	vformat->BytesPerPixel = this->hidden->mi.bpp >> 3;

	if (this->hidden->mi.bpp & 7)

	  vformat->BytesPerPixel++;

	/* We're done! */

	return(0);

}

SDL_Rect **PG_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)

{

   	 return (SDL_Rect **) -1;

}

SDL_Surface *PG_SetVideoMode(_THIS, SDL_Surface *current,

				int width, int height, int bpp, Uint32 flags)

{

	if ( this->hidden->bitmap ) {

	  /* Free old bitmap */

	  if (current->pixels) {

	    shmdt(current->pixels);

	    current->pixels = NULL;

	  }

	  pgDelete(this->hidden->bitmap);

	}

	/* Allocate the new pixel format for the screen */

	if ( ! SDL_ReallocFormat(current, bpp, 0, 0, 0, 0) ) {

		SDL_SetError("Couldn't allocate new pixel format for requested mode");

		return(NULL);

	}

	/* Create a new picogui bitmap */

	this->hidden->bitmap = pgCreateBitmap(width,height);

	this->hidden->shm = *pgMakeSHMBitmap(this->hidden->bitmap);

	current->pixels = shmat(shmget(this->hidden->shm.shm_key,

				       this->hidden->shm.shm_length,0),NULL,0);

	/* Reset the canvas, and draw persistent and incremental grops.

	 * Use mapping and offsets to center it.

	 */

	pgWriteCmd(this->hidden->wCanvas, PGCANVAS_NUKE, 0);

	/* 0. Set the source position during incremental rendering

	 */

	pgWriteCmd(this->hidden->wCanvas, PGCANVAS_GROP, 5, PG_GROP_SETSRC,0,0,0,0);

	pgWriteCmd(this->hidden->wCanvas, PGCANVAS_GROPFLAGS, 1, PG_GROPF_INCREMENTAL);

	/* 1. Incremental bitmap rendering

	 */

	pgWriteCmd(this->hidden->wCanvas, PGCANVAS_GROP, 6, PG_GROP_BITMAP,

		   0,0,0,0,this->hidden->bitmap);

	pgWriteCmd(this->hidden->wCanvas, PGCANVAS_GROPFLAGS, 1, PG_GROPF_INCREMENTAL);

	/* 2. Normal bitmap rendering

	 */

	pgWriteCmd(this->hidden->wCanvas, PGCANVAS_GROP, 6, PG_GROP_BITMAP,

		   0,0,this->hidden->shm.width,this->hidden->shm.height,this->hidden->bitmap);

	/* Set up the new mode framebuffer */

	current->flags = 0;

	current->w = this->hidden->shm.width;

	current->h = this->hidden->shm.height;

	current->pitch = this->hidden->shm.pitch;

	/* Set up pixel format */

	current->format->BitsPerPixel = this->hidden->shm.bpp;

	current->format->BytesPerPixel = this->hidden->shm.bpp >> 3;

	if (this->hidden->shm.bpp & 7)

	  current->format->BytesPerPixel++;

	current->format->palette = NULL;

	current->format->Rmask = this->hidden->shm.red_mask;

	current->format->Gmask = this->hidden->shm.green_mask;

	current->format->Bmask = this->hidden->shm.blue_mask;

	current->format->Amask = this->hidden->shm.alpha_mask;

	current->format->Rshift = this->hidden->shm.red_shift;

	current->format->Gshift = this->hidden->shm.green_shift;

	current->format->Bshift = this->hidden->shm.blue_shift;

	current->format->Ashift = this->hidden->shm.alpha_shift;

	current->format->Rloss = 8 - this->hidden->shm.red_length;

	current->format->Gloss = 8 - this->hidden->shm.green_length;

	current->format->Bloss = 8 - this->hidden->shm.blue_length;

	current->format->Aloss = 8 - this->hidden->shm.alpha_length;

	/* Draw the app */

	pgUpdate();

	/* We're done */

	return(current);

}

/* We don't actually allow hardware surfaces other than the main one */

static int PG_AllocHWSurface(_THIS, SDL_Surface *surface)

{

	return(-1);

}

static void PG_FreeHWSurface(_THIS, SDL_Surface *surface)

{

	return;

}

/* We need to wait for vertical retrace on page flipped displays */

static int PG_LockHWSurface(_THIS, SDL_Surface *surface)

{

	return(0);

}

static void PG_UnlockHWSurface(_THIS, SDL_Surface *surface)

{

	return;

}

static void PG_UpdateRects(_THIS, int numrects, SDL_Rect *rects)

{

        int i;

	for (i = 0; i < numrects; i++) {

	        if (rects[i].w <= 0 || rects[i].h <= 0)

		  continue;

		/* Schedule an incremental update for this rectangle, using

		 * the canvas gropnodes we've loaded beforehand.

		 */

		pgWriteCmd(this->hidden->wCanvas, PGCANVAS_FINDGROP, 1, 0);

		pgWriteCmd(this->hidden->wCanvas, PGCANVAS_MOVEGROP, 4, 

			   rects[i].x, rects[i].y,

			   rects[i].w, rects[i].h);

		pgWriteCmd(this->hidden->wCanvas, PGCANVAS_FINDGROP, 1, 1);

		pgWriteCmd(this->hidden->wCanvas, PGCANVAS_MOVEGROP, 4, 

			   rects[i].x, rects[i].y,

			   rects[i].w, rects[i].h);

		/* Go perform the update */

		pgWriteCmd(this->hidden->wCanvas, PGCANVAS_INCREMENTAL, 0);

		pgSubUpdate(this->hidden->wCanvas);

	}

}

int PG_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)

{

	/* do nothing of note. */

	return(1);

}

/* Note:  If we are terminated, this could be called in the middle of

   another SDL video routine -- notably UpdateRects.

*/

void PG_VideoQuit(_THIS)

{

	if (this->screen->pixels != NULL)

	{

		shmdt(this->screen->pixels);

		this->screen->pixels = NULL;

		pgDelete(this->hidden->bitmap);

	}

	pgDelete(this->hidden->wCanvas);

	pgDelete(this->hidden->wApp);

}

void PG_SetCaption(_THIS, const char *title, const char *icon)

{

        if (title != NULL)

	  pgReplaceText(this->hidden->wApp, title);

	pgUpdate();

}

/* FIXME: The cursor stuff isn't implemented yet! */

WMcursor * PG_CreateWMCursor (_THIS,Uint8 * data, Uint8 * mask, 

			      int w, int h, int hot_x, int hot_y)

{

        static WMcursor dummy;

        return &dummy;

}

void PG_FreeWMCursor (_THIS, WMcursor * cursor)

{

}

void PG_WarpWMCursor(_THIS, Uint16 x, Uint16 y)

{

}

int PG_ShowWMCursor (_THIS, WMcursor * cursor)

{

        return 1;

}