src/video/dummy/SDL_nullvideo.c
author Ryan C. Gordon <icculus@icculus.org>
Thu, 23 Mar 2006 06:48:12 +0000
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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 "SDL_config.h"
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/* Dummy SDL video driver implementation; this is just enough to make an
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 *  SDL-based application THINK it's got a working video driver, for
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 *  applications that call SDL_Init(SDL_INIT_VIDEO) when they don't need it,
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 *  and also for use as a collection of stubs when porting SDL to a new
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 *  platform for which you haven't yet written a valid video driver.
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 *
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 * This is also a great way to determine bottlenecks: if you think that SDL
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 *  is a performance problem for a given platform, enable this driver, and
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 *  then see if your application runs faster without video overhead.
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 *
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 * Initial work by Ryan C. Gordon (icculus@icculus.org). A good portion
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 *  of this was cut-and-pasted from Stephane Peter's work in the AAlib
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 *  SDL video driver.  Renamed to "DUMMY" by Sam Lantinga.
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 */
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#include "SDL_video.h"
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#include "SDL_mouse.h"
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#include "../SDL_sysvideo.h"
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#include "../SDL_pixels_c.h"
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#include "../../events/SDL_events_c.h"
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#include "SDL_nullvideo.h"
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#include "SDL_nullevents_c.h"
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#include "SDL_nullmouse_c.h"
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#define DUMMYVID_DRIVER_NAME "dummy"
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/* Initialization/Query functions */
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static int DUMMY_VideoInit(_THIS, SDL_PixelFormat *vformat);
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static SDL_Rect **DUMMY_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);
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static SDL_Surface *DUMMY_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);
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static int DUMMY_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);
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static void DUMMY_VideoQuit(_THIS);
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/* Hardware surface functions */
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static int DUMMY_AllocHWSurface(_THIS, SDL_Surface *surface);
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static int DUMMY_LockHWSurface(_THIS, SDL_Surface *surface);
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static void DUMMY_UnlockHWSurface(_THIS, SDL_Surface *surface);
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static void DUMMY_FreeHWSurface(_THIS, SDL_Surface *surface);
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/* etc. */
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static void DUMMY_UpdateRects(_THIS, int numrects, SDL_Rect *rects);
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/* DUMMY driver bootstrap functions */
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static int DUMMY_Available(void)
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{
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	const char *envr = SDL_getenv("SDL_VIDEODRIVER");
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	if ((envr) && (SDL_strcmp(envr, DUMMYVID_DRIVER_NAME) == 0)) {
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		return(1);
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	}
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	return(0);
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}
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static void DUMMY_DeleteDevice(SDL_VideoDevice *device)
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{
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	SDL_free(device->hidden);
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	SDL_free(device);
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}
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static SDL_VideoDevice *DUMMY_CreateDevice(int devindex)
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{
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	SDL_VideoDevice *device;
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	/* Initialize all variables that we clean on shutdown */
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	device = (SDL_VideoDevice *)SDL_malloc(sizeof(SDL_VideoDevice));
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	if ( device ) {
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		SDL_memset(device, 0, (sizeof *device));
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		device->hidden = (struct SDL_PrivateVideoData *)
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				SDL_malloc((sizeof *device->hidden));
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	}
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	if ( (device == NULL) || (device->hidden == NULL) ) {
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		SDL_OutOfMemory();
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		if ( device ) {
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			SDL_free(device);
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		}
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		return(0);
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	}
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	SDL_memset(device->hidden, 0, (sizeof *device->hidden));
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	/* Set the function pointers */
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	device->VideoInit = DUMMY_VideoInit;
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	device->ListModes = DUMMY_ListModes;
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	device->SetVideoMode = DUMMY_SetVideoMode;
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	device->CreateYUVOverlay = NULL;
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	device->SetColors = DUMMY_SetColors;
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	device->UpdateRects = DUMMY_UpdateRects;
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	device->VideoQuit = DUMMY_VideoQuit;
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	device->AllocHWSurface = DUMMY_AllocHWSurface;
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	device->CheckHWBlit = NULL;
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	device->FillHWRect = NULL;
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	device->SetHWColorKey = NULL;
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	device->SetHWAlpha = NULL;
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	device->LockHWSurface = DUMMY_LockHWSurface;
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	device->UnlockHWSurface = DUMMY_UnlockHWSurface;
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	device->FlipHWSurface = NULL;
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	device->FreeHWSurface = DUMMY_FreeHWSurface;
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	device->SetCaption = NULL;
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	device->SetIcon = NULL;
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	device->IconifyWindow = NULL;
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	device->GrabInput = NULL;
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	device->GetWMInfo = NULL;
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	device->InitOSKeymap = DUMMY_InitOSKeymap;
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	device->PumpEvents = DUMMY_PumpEvents;
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	device->free = DUMMY_DeleteDevice;
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	return device;
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}
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VideoBootStrap DUMMY_bootstrap = {
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	DUMMYVID_DRIVER_NAME, "SDL dummy video driver",
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	DUMMY_Available, DUMMY_CreateDevice
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};
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int DUMMY_VideoInit(_THIS, SDL_PixelFormat *vformat)
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{
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	/*
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	fprintf(stderr, "WARNING: You are using the SDL dummy video driver!\n");
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	*/
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	/* Determine the screen depth (use default 8-bit depth) */
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	/* we change this during the SDL_SetVideoMode implementation... */
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	vformat->BitsPerPixel = 8;
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	vformat->BytesPerPixel = 1;
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	/* We're done! */
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	return(0);
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}
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SDL_Rect **DUMMY_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)
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{
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   	 return (SDL_Rect **) -1;
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}
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SDL_Surface *DUMMY_SetVideoMode(_THIS, SDL_Surface *current,
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				int width, int height, int bpp, Uint32 flags)
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{
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	if ( this->hidden->buffer ) {
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		SDL_free( this->hidden->buffer );
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	}
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	this->hidden->buffer = SDL_malloc(width * height * (bpp / 8));
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	if ( ! this->hidden->buffer ) {
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		SDL_SetError("Couldn't allocate buffer for requested mode");
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		return(NULL);
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	}
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/* 	printf("Setting mode %dx%d\n", width, height); */
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	SDL_memset(this->hidden->buffer, 0, width * height * (bpp / 8));
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	/* Allocate the new pixel format for the screen */
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	if ( ! SDL_ReallocFormat(current, bpp, 0, 0, 0, 0) ) {
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		SDL_free(this->hidden->buffer);
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		this->hidden->buffer = NULL;
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		SDL_SetError("Couldn't allocate new pixel format for requested mode");
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		return(NULL);
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	}
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	/* Set up the new mode framebuffer */
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	current->flags = flags & SDL_FULLSCREEN;
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	this->hidden->w = current->w = width;
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	this->hidden->h = current->h = height;
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	current->pitch = current->w * (bpp / 8);
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	current->pixels = this->hidden->buffer;
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	/* We're done */
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	return(current);
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}
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/* We don't actually allow hardware surfaces other than the main one */
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static int DUMMY_AllocHWSurface(_THIS, SDL_Surface *surface)
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{
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	return(-1);
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}
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static void DUMMY_FreeHWSurface(_THIS, SDL_Surface *surface)
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{
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	return;
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}
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/* We need to wait for vertical retrace on page flipped displays */
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static int DUMMY_LockHWSurface(_THIS, SDL_Surface *surface)
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{
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	return(0);
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}
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static void DUMMY_UnlockHWSurface(_THIS, SDL_Surface *surface)
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{
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	return;
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}
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static void DUMMY_UpdateRects(_THIS, int numrects, SDL_Rect *rects)
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{
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	/* do nothing. */
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}
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int DUMMY_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)
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{
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	/* do nothing of note. */
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	return(1);
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}
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/* Note:  If we are terminated, this could be called in the middle of
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   another SDL video routine -- notably UpdateRects.
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*/
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void DUMMY_VideoQuit(_THIS)
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{
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	if (this->screen->pixels != NULL)
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	{
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		SDL_free(this->screen->pixels);
1
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		this->screen->pixels = NULL;
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	}
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}