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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2012 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"
/* Dummy SDL video driver implementation; this is just enough to make an
* SDL-based application THINK it's got a working video driver, for
* applications that call SDL_Init(SDL_INIT_VIDEO) when they don't need it,
* and also for use as a collection of stubs when porting SDL to a new
* platform for which you haven't yet written a valid video driver.
*
* This is also a great way to determine bottlenecks: if you think that SDL
* is a performance problem for a given platform, enable this driver, and
* then see if your application runs faster without video overhead.
*
* Initial work by Ryan C. Gordon (icculus@icculus.org). A good portion
* of this was cut-and-pasted from Stephane Peter's work in the AAlib
* SDL video driver. Renamed to "DUMMY" by Sam Lantinga.
*/
#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_nullvideo.h"
#include "SDL_nullevents_c.h"
#include "SDL_nullmouse_c.h"
#define DUMMYVID_DRIVER_NAME "dummy"
/* Initialization/Query functions */
static int DUMMY_VideoInit(_THIS, SDL_PixelFormat *vformat);
static SDL_Rect **DUMMY_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);
static SDL_Surface *DUMMY_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);
static int DUMMY_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);
static void DUMMY_VideoQuit(_THIS);
/* Hardware surface functions */
static int DUMMY_AllocHWSurface(_THIS, SDL_Surface *surface);
static int DUMMY_LockHWSurface(_THIS, SDL_Surface *surface);
static void DUMMY_UnlockHWSurface(_THIS, SDL_Surface *surface);
static void DUMMY_FreeHWSurface(_THIS, SDL_Surface *surface);
/* etc. */
static void DUMMY_UpdateRects(_THIS, int numrects, SDL_Rect *rects);
/* DUMMY driver bootstrap functions */
static int DUMMY_Available(void)
{
const char *envr = SDL_getenv("SDL_VIDEODRIVER");
if ((envr) && (SDL_strcmp(envr, DUMMYVID_DRIVER_NAME) == 0)) {
return(1);
}
return(0);
}
static void DUMMY_DeleteDevice(SDL_VideoDevice *device)
{
SDL_free(device->hidden);
SDL_free(device);
}
static SDL_VideoDevice *DUMMY_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 = DUMMY_VideoInit;
device->ListModes = DUMMY_ListModes;
device->SetVideoMode = DUMMY_SetVideoMode;
device->CreateYUVOverlay = NULL;
device->SetColors = DUMMY_SetColors;
device->UpdateRects = DUMMY_UpdateRects;
device->VideoQuit = DUMMY_VideoQuit;
device->AllocHWSurface = DUMMY_AllocHWSurface;
device->CheckHWBlit = NULL;
device->FillHWRect = NULL;
device->SetHWColorKey = NULL;
device->SetHWAlpha = NULL;
device->LockHWSurface = DUMMY_LockHWSurface;
device->UnlockHWSurface = DUMMY_UnlockHWSurface;
device->FlipHWSurface = NULL;
device->FreeHWSurface = DUMMY_FreeHWSurface;
device->SetCaption = NULL;
device->SetIcon = NULL;
device->IconifyWindow = NULL;
device->GrabInput = NULL;
device->GetWMInfo = NULL;
device->InitOSKeymap = DUMMY_InitOSKeymap;
device->PumpEvents = DUMMY_PumpEvents;
device->free = DUMMY_DeleteDevice;
return device;
}
VideoBootStrap DUMMY_bootstrap = {
DUMMYVID_DRIVER_NAME, "SDL dummy video driver",
DUMMY_Available, DUMMY_CreateDevice
};
int DUMMY_VideoInit(_THIS, SDL_PixelFormat *vformat)
{
/*
fprintf(stderr, "WARNING: You are using the SDL dummy video driver!\n");
*/
/* Determine the screen depth (use default 8-bit depth) */
/* we change this during the SDL_SetVideoMode implementation... */
vformat->BitsPerPixel = 8;
vformat->BytesPerPixel = 1;
/* We're done! */
return(0);
}
SDL_Rect **DUMMY_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)
{
return (SDL_Rect **) -1;
}
SDL_Surface *DUMMY_SetVideoMode(_THIS, SDL_Surface *current,
int width, int height, int bpp, Uint32 flags)
{
if ( this->hidden->buffer ) {
SDL_free( this->hidden->buffer );
}
this->hidden->buffer = SDL_malloc(width * height * (bpp / 8));
if ( ! this->hidden->buffer ) {
SDL_SetError("Couldn't allocate buffer for requested mode");
return(NULL);
}
/* printf("Setting mode %dx%d\n", width, height); */
SDL_memset(this->hidden->buffer, 0, width * height * (bpp / 8));
/* Allocate the new pixel format for the screen */
if ( ! SDL_ReallocFormat(current, bpp, 0, 0, 0, 0) ) {
SDL_free(this->hidden->buffer);
this->hidden->buffer = NULL;
SDL_SetError("Couldn't allocate new pixel format for requested mode");
return(NULL);
}
/* Set up the new mode framebuffer */
current->flags = flags & SDL_FULLSCREEN;
this->hidden->w = current->w = width;
this->hidden->h = current->h = height;
current->pitch = current->w * (bpp / 8);
current->pixels = this->hidden->buffer;
/* We're done */
return(current);
}
/* We don't actually allow hardware surfaces other than the main one */
static int DUMMY_AllocHWSurface(_THIS, SDL_Surface *surface)
{
return(-1);
}
static void DUMMY_FreeHWSurface(_THIS, SDL_Surface *surface)
{
return;
}
/* We need to wait for vertical retrace on page flipped displays */
static int DUMMY_LockHWSurface(_THIS, SDL_Surface *surface)
{
return(0);
}
static void DUMMY_UnlockHWSurface(_THIS, SDL_Surface *surface)
{
return;
}
static void DUMMY_UpdateRects(_THIS, int numrects, SDL_Rect *rects)
{
/* do nothing. */
}
int DUMMY_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 DUMMY_VideoQuit(_THIS)
{
if (this->screen->pixels != NULL)
{
SDL_free(this->screen->pixels);
this->screen->pixels = NULL;
}
}
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