libsdl patch for new libcaca api

(Portage version: 2.1.2_pre1-r4)

1 files changed, 608 insertions, 0 deletions

diff --git a/media-libs/libsdl/files/libsdl-1.2.11-libcaca-new-api.patch b/media-libs/libsdl/files/libsdl-1.2.11-libcaca-new-api.patch
new file mode 100644
index 000000000000..65be7dcb590e
--- /dev/null
+++ b/media-libs/libsdl/files/libsdl-1.2.11-libcaca-new-api.patch
@@ -0,0 +1,608 @@
+diff -Naur SDL-1.2.11-vanilla/configure.in SDL-1.2.11/configure.in
+--- SDL-1.2.11-vanilla/configure.in	2006-06-27 06:48:33.000000000 +0200
++++ SDL-1.2.11/configure.in	2006-09-28 00:59:04.485910345 +0200
+@@ -1338,6 +1338,38 @@
+     fi
+ }
+ 
++dnl Find the libcaca includes
++CheckCaca()
++{
++    AC_ARG_ENABLE(video-caca,
++AC_HELP_STRING([--enable-video-caca], [use libcaca video driver [[default=no]]]),
++                  , enable_video_caca=no)
++    if test x$enable_video = xyes -a x$enable_video_caca = xyes; then
++        video_caca=no
++        AC_PATH_PROG(CACACONFIG, caca-config, no)
++        if test x$CACACONFIG != xno; then
++            AC_MSG_CHECKING(for libcaca support)
++            CACA_CFLAGS=`$CACACONFIG --cflags`
++            CACA_LDFLAGS=`$CACACONFIG --libs`
++            save_CFLAGS="$CFLAGS"
++            AC_TRY_COMPILE([
++             #include <caca.h>
++            ],[
++            ],[
++             video_caca=yes
++            ])
++            CFLAGS="$save_CFLAGS"
++            AC_MSG_RESULT($video_caca)
++            if test x$video_caca = xyes; then
++                AC_DEFINE(SDL_VIDEO_DRIVER_CACA)
++                EXTRA_CFLAGS="$EXTRA_CFLAGS $CACA_CFLAGS"
++                EXTRA_LDFLAGS="$EXTRA_LDFLAGS $CACA_LDFLAGS"
++                SOURCES="$SOURCES $srcdir/src/video/caca/*.c"
++            fi
++        fi
++    fi
++}
++
+ dnl Set up the QTopia video driver if enabled
+ CheckQtopia()
+ {
+@@ -2152,6 +2184,7 @@
+         CheckVGL
+         CheckWscons
+         CheckAAlib
++        CheckCaca
+         CheckQtopia
+         CheckPicoGUI
+         CheckOpenGLX11
+diff -Naur SDL-1.2.11-vanilla/src/video/caca/SDL_cacaevents.c SDL-1.2.11/src/video/caca/SDL_cacaevents.c
+--- SDL-1.2.11-vanilla/src/video/caca/SDL_cacaevents.c	1970-01-01 01:00:00.000000000 +0100
++++ SDL-1.2.11/src/video/caca/SDL_cacaevents.c	2006-09-28 01:00:37.750731937 +0200
+@@ -0,0 +1,101 @@
++/*
++    SDL - Simple DirectMedia Layer
++    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  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
++*/
++
++#ifdef SAVE_RCSID
++static char rcsid =
++ "@(#) $Id: libsdl-1.2.11-libcaca-new-api.patch,v 1.1 2006/09/27 23:24:55 hanno Exp $";
++#endif
++
++#include <stdio.h>
++
++#include <caca.h>
++#ifdef CACA_API_VERSION_1
++#include <caca0.h>
++#endif
++
++#include "SDL.h"
++#include "../../events/SDL_sysevents.h"
++#include "../../events/SDL_events_c.h"
++#include "SDL_cacavideo.h"
++#include "SDL_cacaevents_c.h"
++
++void Caca_PumpEvents(_THIS)
++{
++	int posted = 0;
++	int event;
++	SDL_keysym keysym;
++
++	if( ! this->screen ) /* Wait till we got the screen initialised */
++	  return;
++
++	do {
++		posted = 0;
++
++		/* Get libcaca event */
++		SDL_mutexP(Caca_mutex);
++		event = caca_get_event(CACA_EVENT_ANY);
++		SDL_mutexV(Caca_mutex);
++
++		if ( event & (CACA_EVENT_KEY_PRESS | CACA_EVENT_KEY_RELEASE)) {
++			int key;
++			switch ( event & 0xffffff )
++			{
++				case CACA_KEY_LEFT: key = SDLK_LEFT; break;
++				case CACA_KEY_RIGHT: key = SDLK_RIGHT; break;
++				case CACA_KEY_UP: key = SDLK_UP; break;
++				case CACA_KEY_DOWN: key = SDLK_DOWN; break;
++				default: key = event & 0xff; break;
++			}
++			/* Key pressed */
++/*    		printf("Key pressed: %d (%c)\n", key, key); */
++			keysym.scancode = key;
++			keysym.sym = key;
++			keysym.mod = KMOD_NONE;
++			keysym.unicode = 0;
++			if ( SDL_TranslateUNICODE ) {
++				keysym.unicode = key;
++			}
++			posted += SDL_PrivateKeyboard((event & CACA_EVENT_KEY_PRESS) ? SDL_PRESSED : SDL_RELEASED, &keysym);
++		}
++		else if ( event & (CACA_EVENT_MOUSE_PRESS | CACA_EVENT_MOUSE_RELEASE) ) {
++			/* FIXME: we currently ignore the button type! */
++			int button = event & 0x00ffffff;
++			if ( button > 3 ) {
++				button = 1;
++			}
++			posted += SDL_PrivateMouseButton((event & CACA_EVENT_MOUSE_PRESS) ? SDL_PRESSED : SDL_RELEASED, button, 0, 0);
++		}
++		else if ( event & CACA_EVENT_MOUSE_MOTION ) {
++			int new_x = 0, new_y = 0;
++			new_x = ((event & 0x00fff000) >> 12) * Caca_w / caca_get_width();
++			new_y = ((event & 0x00000fff) >> 0) * Caca_h / caca_get_height();
++			posted += SDL_PrivateMouseMotion(0, 0, new_x, new_y);
++		}
++	} while ( posted );
++}
++
++void Caca_InitOSKeymap(_THIS)
++{
++    return;
++}
++
++
+diff -Naur SDL-1.2.11-vanilla/src/video/caca/SDL_cacaevents_c.h SDL-1.2.11/src/video/caca/SDL_cacaevents_c.h
+--- SDL-1.2.11-vanilla/src/video/caca/SDL_cacaevents_c.h	1970-01-01 01:00:00.000000000 +0100
++++ SDL-1.2.11/src/video/caca/SDL_cacaevents_c.h	2006-09-28 00:59:04.516905633 +0200
+@@ -0,0 +1,35 @@
++/*
++    SDL - Simple DirectMedia Layer
++    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  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
++*/
++
++#ifdef SAVE_RCSID
++static char rcsid =
++ "@(#) $Id: libsdl-1.2.11-libcaca-new-api.patch,v 1.1 2006/09/27 23:24:55 hanno Exp $";
++#endif
++
++#include "SDL_cacavideo.h"
++
++/* Variables and functions exported by SDL_sysevents.c to other parts.
++   of the native video subsystem (SDL_sysvideo.c)
++*/
++extern void Caca_PumpEvents(_THIS);
++extern void Caca_InitOSKeymap(_THIS);
++
+diff -Naur SDL-1.2.11-vanilla/src/video/caca/SDL_cacavideo.c SDL-1.2.11/src/video/caca/SDL_cacavideo.c
+--- SDL-1.2.11-vanilla/src/video/caca/SDL_cacavideo.c	1970-01-01 01:00:00.000000000 +0100
++++ SDL-1.2.11/src/video/caca/SDL_cacavideo.c	2006-09-28 01:00:37.994694849 +0200
+@@ -0,0 +1,304 @@
++/*
++    SDL - Simple DirectMedia Layer
++    Copyright (C) 2003  Sam Hocevar
++
++    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 Hocevar
++    sam@zoy.org
++*/
++
++#ifdef SAVE_RCSID
++static char rcsid =
++ "@(#) $Id: libsdl-1.2.11-libcaca-new-api.patch,v 1.1 2006/09/27 23:24:55 hanno Exp $";
++#endif
++
++/* libcaca based SDL video driver implementation.
++*/
++
++#include <stdlib.h>
++#include <stdio.h>
++#include <string.h>
++#include <unistd.h>
++#include <sys/stat.h>
++
++
++#include "SDL.h"
++#include "SDL_error.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_cacavideo.h"
++#include "SDL_cacaevents_c.h"
++
++#include <caca.h>
++#ifdef CACA_API_VERSION_1
++#include <caca0.h>
++#endif
++
++/* Initialization/Query functions */
++static int Caca_VideoInit(_THIS, SDL_PixelFormat *vformat);
++static SDL_Rect **Caca_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);
++static SDL_Surface *Caca_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);
++static void Caca_VideoQuit(_THIS);
++
++/* Hardware surface functions */
++static int Caca_AllocHWSurface(_THIS, SDL_Surface *surface);
++static int Caca_LockHWSurface(_THIS, SDL_Surface *surface);
++static int Caca_FlipHWSurface(_THIS, SDL_Surface *surface);
++static void Caca_UnlockHWSurface(_THIS, SDL_Surface *surface);
++static void Caca_FreeHWSurface(_THIS, SDL_Surface *surface);
++
++/* Cache the VideoDevice struct */
++static struct SDL_VideoDevice *local_this;
++
++/* libcaca driver bootstrap functions */
++
++static int Caca_Available(void)
++{
++	return 1; /* Always available ! */
++}
++
++static void Caca_DeleteDevice(SDL_VideoDevice *device)
++{
++	free(device->hidden);
++	free(device);
++}
++static SDL_VideoDevice *Caca_CreateDevice(int devindex)
++{
++	SDL_VideoDevice *device;
++
++	/* Initialize all variables that we clean on shutdown */
++	device = (SDL_VideoDevice *)malloc(sizeof(SDL_VideoDevice));
++	if ( device ) {
++		memset(device, 0, (sizeof *device));
++		device->hidden = (struct SDL_PrivateVideoData *)
++				malloc((sizeof *device->hidden));
++	}
++	if ( (device == NULL) || (device->hidden == NULL) ) {
++		SDL_OutOfMemory();
++		if ( device ) {
++			free(device);
++		}
++		return(0);
++	}
++	memset(device->hidden, 0, (sizeof *device->hidden));
++
++	/* Set the function pointers */
++	device->VideoInit = Caca_VideoInit;
++	device->ListModes = Caca_ListModes;
++	device->SetVideoMode = Caca_SetVideoMode;
++	device->CreateYUVOverlay = NULL;
++	device->SetColors = NULL;
++	device->UpdateRects = NULL;
++	device->VideoQuit = Caca_VideoQuit;
++	device->AllocHWSurface = Caca_AllocHWSurface;
++	device->CheckHWBlit = NULL;
++	device->FillHWRect = NULL;
++	device->SetHWColorKey = NULL;
++	device->SetHWAlpha = NULL;
++	device->LockHWSurface = Caca_LockHWSurface;
++	device->UnlockHWSurface = Caca_UnlockHWSurface;
++	device->FlipHWSurface = NULL;
++	device->FreeHWSurface = Caca_FreeHWSurface;
++	device->SetCaption = NULL;
++	device->SetIcon = NULL;
++	device->IconifyWindow = NULL;
++	device->GrabInput = NULL;
++	device->GetWMInfo = NULL;
++	device->InitOSKeymap = Caca_InitOSKeymap;
++	device->PumpEvents = Caca_PumpEvents;
++
++	device->free = Caca_DeleteDevice;
++
++	return device;
++}
++
++VideoBootStrap Caca_bootstrap = {
++	"caca", "Color ASCII Art Library",
++	Caca_Available, Caca_CreateDevice
++};
++
++int Caca_VideoInit(_THIS, SDL_PixelFormat *vformat)
++{
++	int i;
++
++	/* Initialize all variables that we clean on shutdown */
++	for ( i=0; i<SDL_NUMMODES; ++i ) {
++		SDL_modelist[i] = malloc(sizeof(SDL_Rect));
++		SDL_modelist[i]->x = SDL_modelist[i]->y = 0;
++	}
++	/* Modes sorted largest to smallest */
++	SDL_modelist[0]->w = 1024; SDL_modelist[0]->h = 768;
++	SDL_modelist[1]->w = 800; SDL_modelist[1]->h = 600;
++	SDL_modelist[2]->w = 640; SDL_modelist[2]->h = 480;
++	SDL_modelist[3]->w = 320; SDL_modelist[3]->h = 400;
++	SDL_modelist[4]->w = 320; SDL_modelist[4]->h = 240;
++	SDL_modelist[5]->w = 320; SDL_modelist[5]->h = 200;
++	SDL_modelist[6] = NULL;
++
++	Caca_mutex = SDL_CreateMutex();
++
++	/* Initialize the library */
++	if ( caca_init() != 0 ) {
++		SDL_SetError("Unable to initialize libcaca");
++		return(-1);
++	}
++
++	/* Initialize private variables */
++	Caca_lastkey = 0;
++	Caca_bitmap = NULL;
++	Caca_buffer = NULL;
++
++	local_this = this;
++
++	/* Determine the screen depth (use default 8-bit depth) */
++	vformat->BitsPerPixel = 8;
++	vformat->BytesPerPixel = 1;
++
++	/* We're done! */
++	return(0);
++}
++
++SDL_Rect **Caca_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)
++{
++     if(format->BitsPerPixel != 8)
++ 		return NULL;
++
++	 if ( flags & SDL_FULLSCREEN ) {
++		 return SDL_modelist;
++	 } else {
++		 return (SDL_Rect **) -1;
++	 }
++}
++
++/* Various screen update functions available */
++static void Caca_DirectUpdate(_THIS, int numrects, SDL_Rect *rects);
++
++SDL_Surface *Caca_SetVideoMode(_THIS, SDL_Surface *current,
++				int width, int height, int bpp, Uint32 flags)
++{
++	if ( Caca_buffer ) {
++		free( Caca_buffer );
++		Caca_buffer = NULL;
++	}
++
++	if ( Caca_bitmap ) {
++		caca_free_bitmap( Caca_bitmap );
++		Caca_bitmap = NULL;
++	}
++
++	Caca_buffer = malloc(2 * ((width + 15) & ~15) * height);
++	if ( ! Caca_buffer ) {
++		SDL_SetError("Couldn't allocate buffer for requested mode");
++		return(NULL);
++	}
++
++	memset(Caca_buffer, 0, 2 * ((width + 15) & ~15) * height);
++
++	/* Allocate the new pixel format for the screen */
++	if ( ! SDL_ReallocFormat(current, 16, 0xf800, 0x07e0, 0x001f, 0) ) {
++		return(NULL);
++	}
++
++	/* Set up the new mode framebuffer */
++	current->flags = SDL_FULLSCREEN;
++	Caca_w = current->w = width;
++	Caca_h = current->h = height;
++	current->pitch = 2 * ((width + 15) & ~15);
++	current->pixels = Caca_buffer;
++
++	/* Create the libcaca bitmap */
++	Caca_bitmap = caca_create_bitmap( 16, width, height, current->pitch, 0xf800, 0x07e0, 0x001f, 0x0000 );
++	if ( ! Caca_bitmap ) {
++		SDL_SetError("Couldn't allocate libcaca bitmap");
++		return(NULL);
++	}
++
++	/* Set the blit function */
++	this->UpdateRects = Caca_DirectUpdate;
++
++	/* We're done */
++	return(current);
++}
++
++/* We don't actually allow hardware surfaces other than the main one */
++static int Caca_AllocHWSurface(_THIS, SDL_Surface *surface)
++{
++	return(-1);
++}
++static void Caca_FreeHWSurface(_THIS, SDL_Surface *surface)
++{
++	return;
++}
++
++/* We need to wait for vertical retrace on page flipped displays */
++static int Caca_LockHWSurface(_THIS, SDL_Surface *surface)
++{
++	/* TODO ? */
++	return(0);
++}
++static void Caca_UnlockHWSurface(_THIS, SDL_Surface *surface)
++{
++	return;
++}
++
++/* FIXME: How is this done with libcaca? */
++static int Caca_FlipHWSurface(_THIS, SDL_Surface *surface)
++{
++	SDL_mutexP(Caca_mutex);
++	caca_refresh();
++	SDL_mutexV(Caca_mutex);
++	return(0);
++}
++
++static void Caca_DirectUpdate(_THIS, int numrects, SDL_Rect *rects)
++{
++	SDL_mutexP(Caca_mutex);
++	caca_draw_bitmap( 0, 0, caca_get_width() - 1, caca_get_height() - 1,
++			  Caca_bitmap, Caca_buffer );
++	caca_refresh();
++	SDL_mutexV(Caca_mutex);
++	return;
++}
++
++/* Note:  If we are terminated, this could be called in the middle of
++   another SDL video routine -- notably UpdateRects.
++*/
++void Caca_VideoQuit(_THIS)
++{
++	int i;
++
++	/* Free video mode lists */
++	for ( i=0; i<SDL_NUMMODES; ++i ) {
++		if ( SDL_modelist[i] != NULL ) {
++			free(SDL_modelist[i]);
++			SDL_modelist[i] = NULL;
++		}
++	}
++
++	if ( Caca_bitmap ) {
++		caca_free_bitmap( Caca_bitmap );
++		Caca_bitmap = NULL;
++	}
++
++	caca_end();
++
++	SDL_DestroyMutex(Caca_mutex);
++}
++
+diff -Naur SDL-1.2.11-vanilla/src/video/caca/SDL_cacavideo.h SDL-1.2.11/src/video/caca/SDL_cacavideo.h
+--- SDL-1.2.11-vanilla/src/video/caca/SDL_cacavideo.h	1970-01-01 01:00:00.000000000 +0100
++++ SDL-1.2.11/src/video/caca/SDL_cacavideo.h	2006-09-28 01:00:38.360639217 +0200
+@@ -0,0 +1,76 @@
++/*
++    SDL - Simple DirectMedia Layer
++    Copyright (C) 2003  Sam Hocevar
++
++    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 Hocevar
++    sam@zoy.org
++*/
++
++#ifdef SAVE_RCSID
++static char rcsid =
++ "@(#) $Id: libsdl-1.2.11-libcaca-new-api.patch,v 1.1 2006/09/27 23:24:55 hanno Exp $";
++#endif
++
++#ifndef _SDL_cacavideo_h
++#define _SDL_cacavideo_h
++
++#include "SDL_mouse.h"
++#include "../SDL_sysvideo.h"
++#include "SDL_mutex.h"
++
++#include <sys/time.h>
++#include <time.h>
++
++#include <caca.h>
++#ifdef CACA_API_VERSION_1
++#include <caca0.h>
++#endif
++
++/* Hidden "this" pointer for the video functions */
++#define _THIS	SDL_VideoDevice *this
++
++#define SDL_NUMMODES 6
++
++/* Private display data */
++struct SDL_PrivateVideoData {
++	SDL_Rect *SDL_modelist[SDL_NUMMODES+1];
++	SDL_mutex *mutex;
++
++	struct caca_bitmap *bitmap;
++	void *buffer;
++	int w, h;
++
++	int lastkey;
++	struct timeval lasttime;
++};
++
++/* Old variable names */
++#define SDL_modelist		(this->hidden->SDL_modelist)
++#define Caca_palette		    (this->hidden->palette)
++#define Caca_bitmap		    (this->hidden->bitmap)
++#define Caca_buffer		    (this->hidden->buffer)
++
++#define Caca_w		    (this->hidden->w)
++#define Caca_h		    (this->hidden->h)
++
++#define Caca_lastkey		    (this->hidden->lastkey)
++#define Caca_lasttime		    (this->hidden->lasttime)
++
++#define Caca_mutex		    (this->hidden->mutex)
++
++#endif /* _SDL_cacavideo_h */
++
+diff -Naur SDL-1.2.11-vanilla/src/video/SDL_sysvideo.h SDL-1.2.11/src/video/SDL_sysvideo.h
+--- SDL-1.2.11-vanilla/src/video/SDL_sysvideo.h	2006-05-01 10:02:48.000000000 +0200
++++ SDL-1.2.11/src/video/SDL_sysvideo.h	2006-09-28 00:59:04.519905177 +0200
+@@ -404,6 +404,9 @@
+ #if SDL_VIDEO_DRIVER_AALIB
+ extern VideoBootStrap AALIB_bootstrap;
+ #endif
++#if SDL_VIDEO_DRIVER_CACA
++extern VideoBootStrap CACA_bootstrap;
++#endif
+ #if SDL_VIDEO_DRIVER_DUMMY
+ extern VideoBootStrap DUMMY_bootstrap;
+ #endif
+diff -Naur SDL-1.2.11-vanilla/src/video/SDL_video.c SDL-1.2.11/src/video/SDL_video.c
+--- SDL-1.2.11-vanilla/src/video/SDL_video.c	2006-05-01 10:02:48.000000000 +0200
++++ SDL-1.2.11/src/video/SDL_video.c	2006-09-28 00:59:04.522904721 +0200
+@@ -120,6 +120,9 @@
+ #if SDL_VIDEO_DRIVER_AALIB
+ 	&AALIB_bootstrap,
+ #endif
++#if SDL_VIDEO_DRIVER_CACA
++	&CACA_bootstrap,
++#endif
+ #if SDL_VIDEO_DRIVER_DUMMY
+ 	&DUMMY_bootstrap,
+ #endif