sdl_video.c

MPEG-4编解码的实现(包括MPEG4视音频编解码)

	return(retval);
}

/* Retrieve an attribute value from the windowing system. */
int SDL_GL_GetAttribute(SDL_GLattr attr, int* value)
{
	int retval = -1;
	SDL_VideoDevice* video = current_video;
	SDL_VideoDevice* this = current_video;

	if ( video->GL_GetAttribute ) {
		retval = this->GL_GetAttribute(this, attr, value);
	} else {
		*value = 0;
		SDL_SetError("GL_GetAttribute not supported");
	}
	return retval;
}

/* Perform a GL buffer swap on the current GL context */
void SDL_GL_SwapBuffers(void)
{
	SDL_VideoDevice *video = current_video;
	SDL_VideoDevice *this = current_video;

	if ( video->screen->flags & SDL_OPENGL ) {
		video->GL_SwapBuffers(this);
	} else {
		SDL_SetError("OpenGL video mode has not been set");
	}
}

/* Update rects with locking */
void SDL_GL_UpdateRectsLock(SDL_VideoDevice* this, int numrects, SDL_Rect *rects)
{
	SDL_GL_Lock();
 	SDL_GL_UpdateRects(numrects, rects);
	SDL_GL_Unlock();
}

/* Update rects without state setting and changing (the caller is responsible for it) */
void SDL_GL_UpdateRects(int numrects, SDL_Rect *rects)
{
#ifdef HAVE_OPENGL
	SDL_VideoDevice *this = current_video;
	SDL_Rect update, tmp;
	int x, y, i;

	for ( i = 0; i < numrects; i++ )
	{
		tmp.y = rects[i].y;
		tmp.h = rects[i].h;
		for ( y = 0; y <= rects[i].h / 256; y++ )
		{
			tmp.x = rects[i].x;
			tmp.w = rects[i].w;
			for ( x = 0; x <= rects[i].w / 256; x++ )
			{
				update.x = tmp.x;
				update.y = tmp.y;
				update.w = tmp.w;
				update.h = tmp.h;

				if ( update.w > 256 )
					update.w = 256;

				if ( update.h > 256 )
					update.h = 256;
			
				this->glFlush();
				this->glTexSubImage2D( 
					GL_TEXTURE_2D, 
					0, 
					0, 
					0, 
					update.w, 
					update.h, 
					this->is_32bit? GL_RGBA : GL_RGB,
#ifdef GL_VERSION_1_2
					this->is_32bit ? GL_UNSIGNED_BYTE : GL_UNSIGNED_SHORT_5_6_5,
#else
					GL_UNSIGNED_BYTE,
#endif
					(Uint8 *)this->screen->pixels + 
						this->screen->format->BytesPerPixel * update.x + 
						update.y * this->screen->pitch );
	
				this->glFlush();
				/*
				* Note the parens around the function name:
				* This is because some OpenGL implementations define glTexCoord etc 
				* as macros, and we don't want them expanded here.
				*/
				this->glBegin(GL_TRIANGLE_STRIP);
					(this->glTexCoord2f)( 0.0, 0.0 );	
					(this->glVertex2i)( update.x, update.y );
					(this->glTexCoord2f)( (float)(update.w / 256.0), 0.0 );	
					(this->glVertex2i)( update.x + update.w, update.y );
					(this->glTexCoord2f)( 0.0, (float)(update.h / 256.0) );
					(this->glVertex2i)( update.x, update.y + update.h );
					(this->glTexCoord2f)( (float)(update.w / 256.0), (float)(update.h / 256.0) );	
					(this->glVertex2i)( update.x + update.w	, update.y + update.h );
				this->glEnd();	
			
				tmp.x += 256;
				tmp.w -= 256;
			}
			tmp.y += 256;
			tmp.h -= 256;
		}
	}
#endif
}

/* Lock == save current state */
void SDL_GL_Lock()
{
#ifdef HAVE_OPENGL
	lock_count--;
	if (lock_count==-1)
	{
		SDL_VideoDevice *this = current_video;

		this->glPushAttrib( GL_ALL_ATTRIB_BITS );	/* TODO: narrow range of what is saved */
#ifdef GL_CLIENT_PIXEL_STORE_BIT
		this->glPushClientAttrib( GL_CLIENT_PIXEL_STORE_BIT );
#endif

		this->glEnable(GL_TEXTURE_2D);
		this->glEnable(GL_BLEND);
		this->glDisable(GL_FOG);
		this->glDisable(GL_ALPHA_TEST);
		this->glDisable(GL_DEPTH_TEST);
		this->glDisable(GL_SCISSOR_TEST);	
		this->glDisable(GL_STENCIL_TEST);
		this->glDisable(GL_CULL_FACE);

		this->glBindTexture( GL_TEXTURE_2D, this->texture );
		this->glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
		this->glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );

		this->glPixelStorei( GL_UNPACK_ROW_LENGTH, this->screen->pitch / this->screen->format->BytesPerPixel );
		this->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
		(this->glColor4f)(1.0, 1.0, 1.0, 1.0);		/* Solaris workaround */

		this->glViewport(0, 0, this->screen->w, this->screen->h);
		this->glMatrixMode(GL_PROJECTION);
		this->glPushMatrix();
		this->glLoadIdentity();

		this->glOrtho(0.0, (GLdouble) this->screen->w, (GLdouble) this->screen->h, 0.0, 0.0, 1.0);

		this->glMatrixMode(GL_MODELVIEW);
		this->glPushMatrix();
		this->glLoadIdentity();
	}
#endif
}

/* Unlock == restore saved state */
void SDL_GL_Unlock()
{
#ifdef HAVE_OPENGL
	lock_count++;
	if (lock_count==0)
	{
		SDL_VideoDevice *this = current_video;

		this->glPopMatrix();
		this->glMatrixMode(GL_PROJECTION);
		this->glPopMatrix();

		this->glPopClientAttrib();
		this->glPopAttrib();
	}
#endif
}

/*
 * Sets/Gets the title and icon text of the display window, if any.
 */
void SDL_WM_SetCaption (const char *title, const char *icon)
{
	SDL_VideoDevice *video = current_video;
	SDL_VideoDevice *this  = current_video;

	if ( video ) {
		if ( title ) {
			if ( video->wm_title ) {
				free(video->wm_title);
			}
			video->wm_title = (char *)malloc(strlen(title)+1);
			if ( video->wm_title != NULL ) {
				strcpy(video->wm_title, title);
			}
		}
		if ( icon ) {
			if ( video->wm_icon ) {
				free(video->wm_icon);
			}
			video->wm_icon = (char *)malloc(strlen(icon)+1);
			if ( video->wm_icon != NULL ) {
				strcpy(video->wm_icon, icon);
			}
		}
		if ( (title || icon) && (video->SetCaption != NULL) ) {
			video->SetCaption(this, video->wm_title,video->wm_icon);
		}
	}
}
void SDL_WM_GetCaption (char **title, char **icon)
{
	SDL_VideoDevice *video = current_video;

	if ( video ) {
		if ( title ) {
			*title = video->wm_title;
		}
		if ( icon ) {
			*icon = video->wm_icon;
		}
	}
}

/* Utility function used by SDL_WM_SetIcon() */
static void CreateMaskFromColorKey(SDL_Surface *icon, Uint8 *mask)
{
	int x, y;
	Uint32 colorkey;
#define SET_MASKBIT(icon, x, y, mask) \
	mask[(y*((icon->w+7)/8))+(x/8)] &= ~(0x01<<(7-(x%8)))

	colorkey = icon->format->colorkey;
	switch (icon->format->BytesPerPixel) {
		case 1: { Uint8 *pixels;
			for ( y=0; y<icon->h; ++y ) {
				pixels = (Uint8 *)icon->pixels + y*icon->pitch;
				for ( x=0; x<icon->w; ++x ) {
					if ( *pixels++ == colorkey ) {
						SET_MASKBIT(icon, x, y, mask);
					}
				}
			}
		}
		break;

		case 2: { Uint16 *pixels;
			for ( y=0; y<icon->h; ++y ) {
				pixels = (Uint16 *)icon->pixels +
				                   y*icon->pitch/2;
				for ( x=0; x<icon->w; ++x ) {
					if ( *pixels++ == colorkey ) {
						SET_MASKBIT(icon, x, y, mask);
					}
				}
			}
		}
		break;

		case 4: { Uint32 *pixels;
			for ( y=0; y<icon->h; ++y ) {
				pixels = (Uint32 *)icon->pixels +
				                   y*icon->pitch/4;
				for ( x=0; x<icon->w; ++x ) {
					if ( *pixels++ == colorkey ) {
						SET_MASKBIT(icon, x, y, mask);
					}
				}
			}
		}
		break;
	}
}

/*
 * Sets the window manager icon for the display window.
 */
void SDL_WM_SetIcon (SDL_Surface *icon, Uint8 *mask)
{
	SDL_VideoDevice *video = current_video;
	SDL_VideoDevice *this  = current_video;

	if ( icon && video->SetIcon ) {
		/* Generate a mask if necessary, and create the icon! */
		if ( mask == NULL ) {
			int mask_len = icon->h*(icon->w+7)/8;
			mask = (Uint8 *)malloc(mask_len);
			if ( mask == NULL ) {
				return;
			}
			memset(mask, ~0, mask_len);
			if ( icon->flags & SDL_SRCCOLORKEY ) {
				CreateMaskFromColorKey(icon, mask);
			}
			video->SetIcon(video, icon, mask);
			free(mask);
		} else {
			video->SetIcon(this, icon, mask);
		}
	}
}

/*
 * Grab or ungrab the keyboard and mouse input.
 * This function returns the final grab mode after calling the
 * driver dependent function.
 */
static SDL_GrabMode SDL_WM_GrabInputRaw(SDL_GrabMode mode)
{
	SDL_VideoDevice *video = current_video;
	SDL_VideoDevice *this  = current_video;

	/* Only do something if we have support for grabs */
	if ( video->GrabInput == NULL ) {
		return(video->input_grab);
	}

	/* If the final grab mode if off, only then do we actually grab */
#ifdef DEBUG_GRAB
  printf("SDL_WM_GrabInputRaw(%d) ... ", mode);
#endif
	if ( mode == SDL_GRAB_OFF ) {
		if ( video->input_grab != SDL_GRAB_OFF ) {
			mode = video->GrabInput(this, mode);
		}
	} else {
		if ( video->input_grab == SDL_GRAB_OFF ) {
			mode = video->GrabInput(this, mode);
		}
	}
	if ( mode != video->input_grab ) {
		video->input_grab = mode;
		if ( video->CheckMouseMode ) {
			video->CheckMouseMode(this);
		}
	}
#ifdef DEBUG_GRAB
  printf("Final mode %d\n", video->input_grab);
#endif

	/* Return the final grab state */
	if ( mode >= SDL_GRAB_FULLSCREEN ) {
		mode -= SDL_GRAB_FULLSCREEN;
	}
	return(mode);
}
SDL_GrabMode SDL_WM_GrabInput(SDL_GrabMode mode)
{
	SDL_VideoDevice *video = current_video;

	/* If the video isn't initialized yet, we can't do anything */
	if ( ! video ) {
		return SDL_GRAB_OFF;
	}

	/* Return the current mode on query */
	if ( mode == SDL_GRAB_QUERY ) {
		mode = video->input_grab;
		if ( mode >= SDL_GRAB_FULLSCREEN ) {
			mode -= SDL_GRAB_FULLSCREEN;
		}
		return(mode);
	}

#ifdef DEBUG_GRAB
  printf("SDL_WM_GrabInput(%d) ... ", mode);
#endif
	/* If the video surface is fullscreen, we always grab */
	if ( mode >= SDL_GRAB_FULLSCREEN ) {
		mode -= SDL_GRAB_FULLSCREEN;
	}
	if ( SDL_VideoSurface && (SDL_VideoSurface->flags & SDL_FULLSCREEN) ) {
		mode += SDL_GRAB_FULLSCREEN;
	}
	return(SDL_WM_GrabInputRaw(mode));
}
static SDL_GrabMode SDL_WM_GrabInputOff(void)
{
	SDL_GrabMode mode;

	/* First query the current grab state */
	mode = SDL_WM_GrabInput(SDL_GRAB_QUERY);

	/* Now explicitly turn off input grab */
	SDL_WM_GrabInputRaw(SDL_GRAB_OFF);

	/* Return the old state */
	return(mode);
}

/*
 * Iconify the window in window managed environments.
 * A successful iconification will result in an SDL_APPACTIVE loss event.
 */
int SDL_WM_IconifyWindow(void)
{
	SDL_VideoDevice *video = current_video;
	SDL_VideoDevice *this  = current_video;
	int retval;

	retval = 0;
	if ( video->IconifyWindow ) {
		retval = video->IconifyWindow(this);
	}
	return(retval);
}

/*
 * Toggle fullscreen mode
 */
int SDL_WM_ToggleFullScreen(SDL_Surface *surface)
{
	SDL_VideoDevice *video = current_video;
	SDL_VideoDevice *this  = current_video;
	int toggled;

	toggled = 0;
	if ( SDL_PublicSurface && (surface == SDL_PublicSurface) &&
	     video->ToggleFullScreen ) {
		if ( surface->flags & SDL_FULLSCREEN ) {
			toggled = video->ToggleFullScreen(this, 0);
			if ( toggled ) {
				SDL_VideoSurface->flags &= ~SDL_FULLSCREEN;
				SDL_PublicSurface->flags &= ~SDL_FULLSCREEN;
			}
		} else {
			toggled = video->ToggleFullScreen(this, 1);
			if ( toggled ) {
				SDL_VideoSurface->flags |= SDL_FULLSCREEN;
				SDL_PublicSurface->flags |= SDL_FULLSCREEN;
			}
		}
		/* Double-check the grab state inside SDL_WM_GrabInput() */
		if ( toggled ) {
			SDL_WM_GrabInput(video->input_grab);
		}
	}
	return(toggled);
}

/*
 * Get some platform dependent window manager information
 */
int SDL_GetWMInfo (SDL_SysWMinfo *info)
{
	SDL_VideoDevice *video = current_video;
	SDL_VideoDevice *this  = current_video;

	if ( video && video->GetWMInfo ) {
		return(video->GetWMInfo(this, info));
	} else {
		return(0);
	}
}