src/video/SDL_yuv_sw.c
changeset 0 74212992fb08
child 9 a1c15fa4abb9
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/video/SDL_yuv_sw.c	Thu Apr 26 16:45:43 2001 +0000
@@ -0,0 +1,1313 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997, 1998, 1999, 2000, 2001  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@devolution.com
+*/
+
+#ifdef SAVE_RCSID
+static char rcsid =
+ "@(#) $Id$";
+#endif
+
+/* This is the software implementation of the YUV video overlay support */
+
+/* This code was derived from code carrying the following copyright notices:
+
+ * Copyright (c) 1995 The Regents of the University of California.
+ * All rights reserved.
+ * 
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose, without fee, and without written agreement is
+ * hereby granted, provided that the above copyright notice and the following
+ * two paragraphs appear in all copies of this software.
+ * 
+ * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
+ * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
+ * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+
+ * Copyright (c) 1995 Erik Corry
+ * All rights reserved.
+ * 
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose, without fee, and without written agreement is
+ * hereby granted, provided that the above copyright notice and the following
+ * two paragraphs appear in all copies of this software.
+ * 
+ * IN NO EVENT SHALL ERIK CORRY BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
+ * SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF
+ * THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF ERIK CORRY HAS BEEN ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ * ERIK CORRY SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
+ * BASIS, AND ERIK CORRY HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT,
+ * UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+
+ * Portions of this software Copyright (c) 1995 Brown University.
+ * All rights reserved.
+ * 
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose, without fee, and without written agreement
+ * is hereby granted, provided that the above copyright notice and the
+ * following two paragraphs appear in all copies of this software.
+ * 
+ * IN NO EVENT SHALL BROWN UNIVERSITY BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
+ * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF BROWN
+ * UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ * BROWN UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
+ * BASIS, AND BROWN UNIVERSITY HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
+ * SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "SDL_error.h"
+#include "SDL_video.h"
+#include "SDL_stretch_c.h"
+#include "SDL_yuvfuncs.h"
+#include "SDL_yuv_sw_c.h"
+
+/* Function to check the CPU flags */
+#define MMX_CPU		0x800000
+#ifdef USE_ASMBLIT
+#define CPU_Flags()	Hermes_X86_CPU()
+#else
+#define CPU_Flags()	0L
+#endif
+
+#ifdef USE_ASMBLIT
+#define X86_ASSEMBLER
+#define HermesConverterInterface	void
+#define HermesClearInterface		void
+#define STACKCALL
+typedef Uint32 int32;
+
+#include "HeadX86.h"
+#endif
+
+/* The functions used to manipulate software video overlays */
+static struct private_yuvhwfuncs sw_yuvfuncs = {
+	SDL_LockYUV_SW,
+	SDL_UnlockYUV_SW,
+	SDL_DisplayYUV_SW,
+	SDL_FreeYUV_SW
+};
+
+/* RGB conversion lookup tables */
+struct private_yuvhwdata {
+	SDL_Surface *stretch;
+	SDL_Surface *display;
+	Uint8 *pixels;
+	int *colortab;
+	Uint32 *rgb_2_pix;
+	void (*Display1X)(int *colortab, Uint32 *rgb_2_pix,
+                          unsigned char *lum, unsigned char *cr,
+                          unsigned char *cb, unsigned char *out,
+                          int rows, int cols, int mod );
+	void (*Display2X)(int *colortab, Uint32 *rgb_2_pix,
+	                  unsigned char *lum, unsigned char *cr,
+                          unsigned char *cb, unsigned char *out,
+                          int rows, int cols, int mod );
+
+	/* These are just so we don't have to allocate them separately */
+	Uint16 pitches[3];
+	Uint8 *planes[3];
+};
+
+
+/* The colorspace conversion functions */
+
+extern void Color565DitherYV12MMX1X( int *colortab, Uint32 *rgb_2_pix,
+                                     unsigned char *lum, unsigned char *cr,
+                                     unsigned char *cb, unsigned char *out,
+                                     int rows, int cols, int mod );
+extern void ColorRGBDitherYV12MMX1X( int *colortab, Uint32 *rgb_2_pix,
+                                     unsigned char *lum, unsigned char *cr,
+                                     unsigned char *cb, unsigned char *out,
+                                     int rows, int cols, int mod );
+
+static void Color16DitherYV12Mod1X( int *colortab, Uint32 *rgb_2_pix,
+                                    unsigned char *lum, unsigned char *cr,
+                                    unsigned char *cb, unsigned char *out,
+                                    int rows, int cols, int mod )
+{
+    unsigned short* row1;
+    unsigned short* row2;
+    unsigned char* lum2;
+    int x, y;
+    int cr_r;
+    int crb_g;
+    int cb_b;
+    int cols_2 = cols / 2;
+
+    row1 = (unsigned short*) out;
+    row2 = row1 + cols + mod;
+    lum2 = lum + cols;
+
+    mod += cols + mod;
+
+    y = rows / 2;
+    while( y-- )
+    {
+        x = cols_2;
+        while( x-- )
+        {
+            register int L;
+
+            cr_r   = 0*768+256 + colortab[ *cr + 0*256 ];
+            crb_g  = 1*768+256 + colortab[ *cr + 1*256 ]
+                               + colortab[ *cb + 2*256 ];
+            cb_b   = 2*768+256 + colortab[ *cb + 3*256 ];
+            ++cr; ++cb;
+
+            L = *lum++;
+            *row1++ = (rgb_2_pix[ L + cr_r ] |
+                       rgb_2_pix[ L + crb_g ] |
+                       rgb_2_pix[ L + cb_b ]);
+
+            L = *lum++;
+            *row1++ = (rgb_2_pix[ L + cr_r ] |
+                       rgb_2_pix[ L + crb_g ] |
+                       rgb_2_pix[ L + cb_b ]);
+
+
+            /* Now, do second row.  */
+
+            L = *lum2++;
+            *row2++ = (rgb_2_pix[ L + cr_r ] |
+                       rgb_2_pix[ L + crb_g ] |
+                       rgb_2_pix[ L + cb_b ]);
+
+            L = *lum2++;
+            *row2++ = (rgb_2_pix[ L + cr_r ] |
+                       rgb_2_pix[ L + crb_g ] |
+                       rgb_2_pix[ L + cb_b ]);
+        }
+
+        /*
+         * These values are at the start of the next line, (due
+         * to the ++'s above),but they need to be at the start
+         * of the line after that.
+         */
+        lum  += cols;
+        lum2 += cols;
+        row1 += mod;
+        row2 += mod;
+    }
+}
+
+static void Color24DitherYV12Mod1X( int *colortab, Uint32 *rgb_2_pix,
+                                    unsigned char *lum, unsigned char *cr,
+                                    unsigned char *cb, unsigned char *out,
+                                    int rows, int cols, int mod )
+{
+    unsigned int value;
+    unsigned char* row1;
+    unsigned char* row2;
+    unsigned char* lum2;
+    int x, y;
+    int cr_r;
+    int crb_g;
+    int cb_b;
+    int cols_2 = cols / 2;
+
+    row1 = out;
+    row2 = row1 + cols*3 + mod*3;
+    lum2 = lum + cols;
+
+    mod += cols + mod;
+    mod *= 3;
+
+    y = rows / 2;
+    while( y-- )
+    {
+        x = cols_2;
+        while( x-- )
+        {
+            register int L;
+
+            cr_r   = 0*768+256 + colortab[ *cr + 0*256 ];
+            crb_g  = 1*768+256 + colortab[ *cr + 1*256 ]
+                               + colortab[ *cb + 2*256 ];
+            cb_b   = 2*768+256 + colortab[ *cb + 3*256 ];
+            ++cr; ++cb;
+
+            L = *lum++;
+            value = (rgb_2_pix[ L + cr_r ] |
+                     rgb_2_pix[ L + crb_g ] |
+                     rgb_2_pix[ L + cb_b ]);
+            *row1++ = (value      ) & 0xFF;
+            *row1++ = (value >>  8) & 0xFF;
+            *row1++ = (value >> 16) & 0xFF;
+
+            L = *lum++;
+            value = (rgb_2_pix[ L + cr_r ] |
+                     rgb_2_pix[ L + crb_g ] |
+                     rgb_2_pix[ L + cb_b ]);
+            *row1++ = (value      ) & 0xFF;
+            *row1++ = (value >>  8) & 0xFF;
+            *row1++ = (value >> 16) & 0xFF;
+
+
+            /* Now, do second row.  */
+
+            L = *lum2++;
+            value = (rgb_2_pix[ L + cr_r ] |
+                     rgb_2_pix[ L + crb_g ] |
+                     rgb_2_pix[ L + cb_b ]);
+            *row2++ = (value      ) & 0xFF;
+            *row2++ = (value >>  8) & 0xFF;
+            *row2++ = (value >> 16) & 0xFF;
+
+            L = *lum2++;
+            value = (rgb_2_pix[ L + cr_r ] |
+                     rgb_2_pix[ L + crb_g ] |
+                     rgb_2_pix[ L + cb_b ]);
+            *row2++ = (value      ) & 0xFF;
+            *row2++ = (value >>  8) & 0xFF;
+            *row2++ = (value >> 16) & 0xFF;
+        }
+
+        /*
+         * These values are at the start of the next line, (due
+         * to the ++'s above),but they need to be at the start
+         * of the line after that.
+         */
+        lum  += cols;
+        lum2 += cols;
+        row1 += mod;
+        row2 += mod;
+    }
+}
+
+static void Color32DitherYV12Mod1X( int *colortab, Uint32 *rgb_2_pix,
+                                    unsigned char *lum, unsigned char *cr,
+                                    unsigned char *cb, unsigned char *out,
+                                    int rows, int cols, int mod )
+{
+    unsigned int* row1;
+    unsigned int* row2;
+    unsigned char* lum2;
+    int x, y;
+    int cr_r;
+    int crb_g;
+    int cb_b;
+    int cols_2 = cols / 2;
+
+    row1 = (unsigned int*) out;
+    row2 = row1 + cols + mod;
+    lum2 = lum + cols;
+
+    mod += cols + mod;
+
+    y = rows / 2;
+    while( y-- )
+    {
+        x = cols_2;
+        while( x-- )
+        {
+            register int L;
+
+            cr_r   = 0*768+256 + colortab[ *cr + 0*256 ];
+            crb_g  = 1*768+256 + colortab[ *cr + 1*256 ]
+                               + colortab[ *cb + 2*256 ];
+            cb_b   = 2*768+256 + colortab[ *cb + 3*256 ];
+            ++cr; ++cb;
+
+            L = *lum++;
+            *row1++ = (rgb_2_pix[ L + cr_r ] |
+                       rgb_2_pix[ L + crb_g ] |
+                       rgb_2_pix[ L + cb_b ]);
+
+            L = *lum++;
+            *row1++ = (rgb_2_pix[ L + cr_r ] |
+                       rgb_2_pix[ L + crb_g ] |
+                       rgb_2_pix[ L + cb_b ]);
+
+
+            /* Now, do second row.  */
+
+            L = *lum2++;
+            *row2++ = (rgb_2_pix[ L + cr_r ] |
+                       rgb_2_pix[ L + crb_g ] |
+                       rgb_2_pix[ L + cb_b ]);
+
+            L = *lum2++;
+            *row2++ = (rgb_2_pix[ L + cr_r ] |
+                       rgb_2_pix[ L + crb_g ] |
+                       rgb_2_pix[ L + cb_b ]);
+        }
+
+        /*
+         * These values are at the start of the next line, (due
+         * to the ++'s above),but they need to be at the start
+         * of the line after that.
+         */
+        lum  += cols;
+        lum2 += cols;
+        row1 += mod;
+        row2 += mod;
+    }
+}
+
+/*
+ * In this function I make use of a nasty trick. The tables have the lower
+ * 16 bits replicated in the upper 16. This means I can write ints and get
+ * the horisontal doubling for free (almost).
+ */
+static void Color16DitherYV12Mod2X( int *colortab, Uint32 *rgb_2_pix,
+                                    unsigned char *lum, unsigned char *cr,
+                                    unsigned char *cb, unsigned char *out,
+                                    int rows, int cols, int mod )
+{
+    unsigned int* row1 = (unsigned int*) out;
+    const int next_row = cols+(mod/2);
+    unsigned int* row2 = row1 + 2*next_row;
+    unsigned char* lum2;
+    int x, y;
+    int cr_r;
+    int crb_g;
+    int cb_b;
+    int cols_2 = cols / 2;
+
+    lum2 = lum + cols;
+
+    mod = (next_row * 3) + (mod/2);
+
+    y = rows / 2;
+    while( y-- )
+    {
+        x = cols_2;
+        while( x-- )
+        {
+            register int L;
+
+            cr_r   = 0*768+256 + colortab[ *cr + 0*256 ];
+            crb_g  = 1*768+256 + colortab[ *cr + 1*256 ]
+                               + colortab[ *cb + 2*256 ];
+            cb_b   = 2*768+256 + colortab[ *cb + 3*256 ];
+            ++cr; ++cb;
+
+            L = *lum++;
+            row1[0] = row1[next_row] = (rgb_2_pix[ L + cr_r ] |
+                                        rgb_2_pix[ L + crb_g ] |
+                                        rgb_2_pix[ L + cb_b ]);
+            row1++;
+
+            L = *lum++;
+            row1[0] = row1[next_row] = (rgb_2_pix[ L + cr_r ] |
+                                        rgb_2_pix[ L + crb_g ] |
+                                        rgb_2_pix[ L + cb_b ]);
+            row1++;
+
+
+            /* Now, do second row. */
+
+            L = *lum2++;
+            row2[0] = row2[next_row] = (rgb_2_pix[ L + cr_r ] |
+                                        rgb_2_pix[ L + crb_g ] |
+                                        rgb_2_pix[ L + cb_b ]);
+            row2++;
+
+            L = *lum2++;
+            row2[0] = row2[next_row] = (rgb_2_pix[ L + cr_r ] |
+                                        rgb_2_pix[ L + crb_g ] |
+                                        rgb_2_pix[ L + cb_b ]);
+            row2++;
+        }
+
+        /*
+         * These values are at the start of the next line, (due
+         * to the ++'s above),but they need to be at the start
+         * of the line after that.
+         */
+        lum  += cols;
+        lum2 += cols;
+        row1 += mod;
+        row2 += mod;
+    }
+}
+
+static void Color24DitherYV12Mod2X( int *colortab, Uint32 *rgb_2_pix,
+                                    unsigned char *lum, unsigned char *cr,
+                                    unsigned char *cb, unsigned char *out,
+                                    int rows, int cols, int mod )
+{
+    unsigned int value;
+    unsigned char* row1 = out;
+    const int next_row = (cols*2 + mod) * 3;
+    unsigned char* row2 = row1 + 2*next_row;
+    unsigned char* lum2;
+    int x, y;
+    int cr_r;
+    int crb_g;
+    int cb_b;
+    int cols_2 = cols / 2;
+
+    lum2 = lum + cols;
+
+    mod = next_row*3 + mod*3;
+
+    y = rows / 2;
+    while( y-- )
+    {
+        x = cols_2;
+        while( x-- )
+        {
+            register int L;
+
+            cr_r   = 0*768+256 + colortab[ *cr + 0*256 ];
+            crb_g  = 1*768+256 + colortab[ *cr + 1*256 ]
+                               + colortab[ *cb + 2*256 ];
+            cb_b   = 2*768+256 + colortab[ *cb + 3*256 ];
+            ++cr; ++cb;
+
+            L = *lum++;
+            value = (rgb_2_pix[ L + cr_r ] |
+                     rgb_2_pix[ L + crb_g ] |
+                     rgb_2_pix[ L + cb_b ]);
+            row1[0+0] = row1[3+0] = row1[next_row+0] = row1[next_row+3+0] =
+                     (value      ) & 0xFF;
+            row1[0+1] = row1[3+1] = row1[next_row+1] = row1[next_row+3+1] =
+                     (value >>  8) & 0xFF;
+            row1[0+2] = row1[3+2] = row1[next_row+2] = row1[next_row+3+2] =
+                     (value >> 16) & 0xFF;
+            row1 += 2*3;
+
+            L = *lum++;
+            value = (rgb_2_pix[ L + cr_r ] |
+                     rgb_2_pix[ L + crb_g ] |
+                     rgb_2_pix[ L + cb_b ]);
+            row1[0+0] = row1[3+0] = row1[next_row+0] = row1[next_row+3+0] =
+                     (value      ) & 0xFF;
+            row1[0+1] = row1[3+1] = row1[next_row+1] = row1[next_row+3+1] =
+                     (value >>  8) & 0xFF;
+            row1[0+2] = row1[3+2] = row1[next_row+2] = row1[next_row+3+2] =
+                     (value >> 16) & 0xFF;
+            row1 += 2*3;
+
+
+            /* Now, do second row. */
+
+            L = *lum2++;
+            value = (rgb_2_pix[ L + cr_r ] |
+                     rgb_2_pix[ L + crb_g ] |
+                     rgb_2_pix[ L + cb_b ]);
+            row2[0+0] = row2[3+0] = row2[next_row+0] = row2[next_row+3+0] =
+                     (value      ) & 0xFF;
+            row2[0+1] = row2[3+1] = row2[next_row+1] = row2[next_row+3+1] =
+                     (value >>  8) & 0xFF;
+            row2[0+2] = row2[3+2] = row2[next_row+2] = row2[next_row+3+2] =
+                     (value >> 16) & 0xFF;
+            row2 += 2*3;
+
+            L = *lum2++;
+            value = (rgb_2_pix[ L + cr_r ] |
+                     rgb_2_pix[ L + crb_g ] |
+                     rgb_2_pix[ L + cb_b ]);
+            row2[0+0] = row2[3+0] = row2[next_row+0] = row2[next_row+3+0] =
+                     (value      ) & 0xFF;
+            row2[0+1] = row2[3+1] = row2[next_row+1] = row2[next_row+3+1] =
+                     (value >>  8) & 0xFF;
+            row2[0+2] = row2[3+2] = row2[next_row+2] = row2[next_row+3+2] =
+                     (value >> 16) & 0xFF;
+            row2 += 2*3;
+        }
+
+        /*
+         * These values are at the start of the next line, (due
+         * to the ++'s above),but they need to be at the start
+         * of the line after that.
+         */
+        lum  += cols;
+        lum2 += cols;
+        row1 += mod;
+        row2 += mod;
+    }
+}
+
+static void Color32DitherYV12Mod2X( int *colortab, Uint32 *rgb_2_pix,
+                                    unsigned char *lum, unsigned char *cr,
+                                    unsigned char *cb, unsigned char *out,
+                                    int rows, int cols, int mod )
+{
+    unsigned int* row1 = (unsigned int*) out;
+    const int next_row = cols*2+mod;
+    unsigned int* row2 = row1 + 2*next_row;
+    unsigned char* lum2;
+    int x, y;
+    int cr_r;
+    int crb_g;
+    int cb_b;
+    int cols_2 = cols / 2;
+
+    lum2 = lum + cols;
+
+    mod = (next_row * 3) + mod;
+
+    y = rows / 2;
+    while( y-- )
+    {
+        x = cols_2;
+        while( x-- )
+        {
+            register int L;
+
+            cr_r   = 0*768+256 + colortab[ *cr + 0*256 ];
+            crb_g  = 1*768+256 + colortab[ *cr + 1*256 ]
+                               + colortab[ *cb + 2*256 ];
+            cb_b   = 2*768+256 + colortab[ *cb + 3*256 ];
+            ++cr; ++cb;
+
+            L = *lum++;
+            row1[0] = row1[1] = row1[next_row] = row1[next_row+1] =
+                                       (rgb_2_pix[ L + cr_r ] |
+                                        rgb_2_pix[ L + crb_g ] |
+                                        rgb_2_pix[ L + cb_b ]);
+            row1 += 2;
+
+            L = *lum++;
+            row1[0] = row1[1] = row1[next_row] = row1[next_row+1] =
+                                       (rgb_2_pix[ L + cr_r ] |
+                                        rgb_2_pix[ L + crb_g ] |
+                                        rgb_2_pix[ L + cb_b ]);
+            row1 += 2;
+
+
+            /* Now, do second row. */
+
+            L = *lum2++;
+            row2[0] = row2[1] = row2[next_row] = row2[next_row+1] =
+                                       (rgb_2_pix[ L + cr_r ] |
+                                        rgb_2_pix[ L + crb_g ] |
+                                        rgb_2_pix[ L + cb_b ]);
+            row2 += 2;
+
+            L = *lum2++;
+            row2[0] = row2[1] = row2[next_row] = row2[next_row+1] =
+                                       (rgb_2_pix[ L + cr_r ] |
+                                        rgb_2_pix[ L + crb_g ] |
+                                        rgb_2_pix[ L + cb_b ]);
+            row2 += 2;
+        }
+
+        /*
+         * These values are at the start of the next line, (due
+         * to the ++'s above),but they need to be at the start
+         * of the line after that.
+         */
+        lum  += cols;
+        lum2 += cols;
+        row1 += mod;
+        row2 += mod;
+    }
+}
+
+static void Color16DitherYUY2Mod1X( int *colortab, Uint32 *rgb_2_pix,
+                                    unsigned char *lum, unsigned char *cr,
+                                    unsigned char *cb, unsigned char *out,
+                                    int rows, int cols, int mod )
+{
+    unsigned short* row;
+    int x, y;
+    int cr_r;
+    int crb_g;
+    int cb_b;
+    int cols_2 = cols / 2;
+
+    row = (unsigned short*) out;
+
+    y = rows;
+    while( y-- )
+    {
+        x = cols_2;
+        while( x-- )
+        {
+            register int L;
+
+            cr_r   = 0*768+256 + colortab[ *cr + 0*256 ];
+            crb_g  = 1*768+256 + colortab[ *cr + 1*256 ]
+                               + colortab[ *cb + 2*256 ];
+            cb_b   = 2*768+256 + colortab[ *cb + 3*256 ];
+            cr += 4; cb += 4;
+
+            L = *lum; lum += 2;
+            *row++ = (rgb_2_pix[ L + cr_r ] |
+                       rgb_2_pix[ L + crb_g ] |
+                       rgb_2_pix[ L + cb_b ]);
+
+            L = *lum; lum += 2;
+            *row++ = (rgb_2_pix[ L + cr_r ] |
+                       rgb_2_pix[ L + crb_g ] |
+                       rgb_2_pix[ L + cb_b ]);
+
+        }
+
+        row += mod;
+    }
+}
+
+static void Color24DitherYUY2Mod1X( int *colortab, Uint32 *rgb_2_pix,
+                                    unsigned char *lum, unsigned char *cr,
+                                    unsigned char *cb, unsigned char *out,
+                                    int rows, int cols, int mod )
+{
+    unsigned int value;
+    unsigned char* row;
+    int x, y;
+    int cr_r;
+    int crb_g;
+    int cb_b;
+    int cols_2 = cols / 2;
+
+    row = (unsigned char*) out;
+    mod *= 3;
+    y = rows;
+    while( y-- )
+    {
+        x = cols_2;
+        while( x-- )
+        {
+            register int L;
+
+            cr_r   = 0*768+256 + colortab[ *cr + 0*256 ];
+            crb_g  = 1*768+256 + colortab[ *cr + 1*256 ]
+                               + colortab[ *cb + 2*256 ];
+            cb_b   = 2*768+256 + colortab[ *cb + 3*256 ];
+            cr += 4; cb += 4;
+
+            L = *lum; lum += 2;
+            value = (rgb_2_pix[ L + cr_r ] |
+                     rgb_2_pix[ L + crb_g ] |
+                     rgb_2_pix[ L + cb_b ]);
+            *row++ = (value      ) & 0xFF;
+            *row++ = (value >>  8) & 0xFF;
+            *row++ = (value >> 16) & 0xFF;
+
+            L = *lum; lum += 2;
+            value = (rgb_2_pix[ L + cr_r ] |
+                     rgb_2_pix[ L + crb_g ] |
+                     rgb_2_pix[ L + cb_b ]);
+            *row++ = (value      ) & 0xFF;
+            *row++ = (value >>  8) & 0xFF;
+            *row++ = (value >> 16) & 0xFF;
+
+        }
+        row += mod;
+    }
+}
+
+static void Color32DitherYUY2Mod1X( int *colortab, Uint32 *rgb_2_pix,
+                                    unsigned char *lum, unsigned char *cr,
+                                    unsigned char *cb, unsigned char *out,
+                                    int rows, int cols, int mod )
+{
+    unsigned int* row;
+    int x, y;
+    int cr_r;
+    int crb_g;
+    int cb_b;
+    int cols_2 = cols / 2;
+
+    row = (unsigned int*) out;
+    y = rows;
+    while( y-- )
+    {
+        x = cols_2;
+        while( x-- )
+        {
+            register int L;
+
+            cr_r   = 0*768+256 + colortab[ *cr + 0*256 ];
+            crb_g  = 1*768+256 + colortab[ *cr + 1*256 ]
+                               + colortab[ *cb + 2*256 ];
+            cb_b   = 2*768+256 + colortab[ *cb + 3*256 ];
+            cr += 4; cb += 4;
+
+            L = *lum; lum += 2;
+            *row++ = (rgb_2_pix[ L + cr_r ] |
+                       rgb_2_pix[ L + crb_g ] |
+                       rgb_2_pix[ L + cb_b ]);
+
+            L = *lum; lum += 2;
+            *row++ = (rgb_2_pix[ L + cr_r ] |
+                       rgb_2_pix[ L + crb_g ] |
+                       rgb_2_pix[ L + cb_b ]);
+
+
+        }
+        row += mod;
+    }
+}
+
+/*
+ * In this function I make use of a nasty trick. The tables have the lower
+ * 16 bits replicated in the upper 16. This means I can write ints and get
+ * the horisontal doubling for free (almost).
+ */
+static void Color16DitherYUY2Mod2X( int *colortab, Uint32 *rgb_2_pix,
+                                    unsigned char *lum, unsigned char *cr,
+                                    unsigned char *cb, unsigned char *out,
+                                    int rows, int cols, int mod )
+{
+    unsigned int* row = (unsigned int*) out;
+    const int next_row = cols+(mod/2);
+    int x, y;
+    int cr_r;
+    int crb_g;
+    int cb_b;
+    int cols_2 = cols / 2;
+
+    y = rows;
+    while( y-- )
+    {
+        x = cols_2;
+        while( x-- )
+        {
+            register int L;
+
+            cr_r   = 0*768+256 + colortab[ *cr + 0*256 ];
+            crb_g  = 1*768+256 + colortab[ *cr + 1*256 ]
+                               + colortab[ *cb + 2*256 ];
+            cb_b   = 2*768+256 + colortab[ *cb + 3*256 ];
+            cr += 4; cb += 4;
+
+            L = *lum; lum += 2;
+            row[0] = row[next_row] = (rgb_2_pix[ L + cr_r ] |
+                                        rgb_2_pix[ L + crb_g ] |
+                                        rgb_2_pix[ L + cb_b ]);
+            row++;
+
+            L = *lum; lum += 2;
+            row[0] = row[next_row] = (rgb_2_pix[ L + cr_r ] |
+                                        rgb_2_pix[ L + crb_g ] |
+                                        rgb_2_pix[ L + cb_b ]);
+            row++;
+
+        }
+        row += next_row;
+    }
+}
+
+static void Color24DitherYUY2Mod2X( int *colortab, Uint32 *rgb_2_pix,
+                                    unsigned char *lum, unsigned char *cr,
+                                    unsigned char *cb, unsigned char *out,
+                                    int rows, int cols, int mod )
+{
+    unsigned int value;
+    unsigned char* row = out;
+    const int next_row = (cols*2 + mod) * 3;
+    int x, y;
+    int cr_r;
+    int crb_g;
+    int cb_b;
+    int cols_2 = cols / 2;
+    y = rows;
+    while( y-- )
+    {
+        x = cols_2;
+        while( x-- )
+        {
+            register int L;
+
+            cr_r   = 0*768+256 + colortab[ *cr + 0*256 ];
+            crb_g  = 1*768+256 + colortab[ *cr + 1*256 ]
+                               + colortab[ *cb + 2*256 ];
+            cb_b   = 2*768+256 + colortab[ *cb + 3*256 ];
+            cr += 4; cb += 4;
+
+            L = *lum; lum += 2;
+            value = (rgb_2_pix[ L + cr_r ] |
+                     rgb_2_pix[ L + crb_g ] |
+                     rgb_2_pix[ L + cb_b ]);
+            row[0+0] = row[3+0] = row[next_row+0] = row[next_row+3+0] =
+                     (value      ) & 0xFF;
+            row[0+1] = row[3+1] = row[next_row+1] = row[next_row+3+1] =
+                     (value >>  8) & 0xFF;
+            row[0+2] = row[3+2] = row[next_row+2] = row[next_row+3+2] =
+                     (value >> 16) & 0xFF;
+            row += 2*3;
+
+            L = *lum; lum += 2;
+            value = (rgb_2_pix[ L + cr_r ] |
+                     rgb_2_pix[ L + crb_g ] |
+                     rgb_2_pix[ L + cb_b ]);
+            row[0+0] = row[3+0] = row[next_row+0] = row[next_row+3+0] =
+                     (value      ) & 0xFF;
+            row[0+1] = row[3+1] = row[next_row+1] = row[next_row+3+1] =
+                     (value >>  8) & 0xFF;
+            row[0+2] = row[3+2] = row[next_row+2] = row[next_row+3+2] =
+                     (value >> 16) & 0xFF;
+            row += 2*3;
+
+        }
+        row += next_row;
+    }
+}
+
+static void Color32DitherYUY2Mod2X( int *colortab, Uint32 *rgb_2_pix,
+                                    unsigned char *lum, unsigned char *cr,
+                                    unsigned char *cb, unsigned char *out,
+                                    int rows, int cols, int mod )
+{
+    unsigned int* row = (unsigned int*) out;
+    const int next_row = cols*2+mod;
+    int x, y;
+    int cr_r;
+    int crb_g;
+    int cb_b;
+    int cols_2 = cols / 2;
+    mod+=mod;
+    y = rows;
+    while( y-- )
+    {
+        x = cols_2;
+        while( x-- )
+        {
+            register int L;
+
+            cr_r   = 0*768+256 + colortab[ *cr + 0*256 ];
+            crb_g  = 1*768+256 + colortab[ *cr + 1*256 ]
+                               + colortab[ *cb + 2*256 ];
+            cb_b   = 2*768+256 + colortab[ *cb + 3*256 ];
+            cr += 4; cb += 4;
+
+            L = *lum; lum += 2;
+            row[0] = row[1] = row[next_row] = row[next_row+1] =
+                                       (rgb_2_pix[ L + cr_r ] |
+                                        rgb_2_pix[ L + crb_g ] |
+                                        rgb_2_pix[ L + cb_b ]);
+            row += 2;
+
+            L = *lum; lum += 2;
+            row[0] = row[1] = row[next_row] = row[next_row+1] =
+                                       (rgb_2_pix[ L + cr_r ] |
+                                        rgb_2_pix[ L + crb_g ] |
+                                        rgb_2_pix[ L + cb_b ]);
+            row += 2;
+
+
+        }
+
+        row += next_row;
+    }
+}
+
+/*
+ * How many 1 bits are there in the Uint32.
+ * Low performance, do not call often.
+ */
+static int number_of_bits_set( Uint32 a )
+{
+    if(!a) return 0;
+    if(a & 1) return 1 + number_of_bits_set(a >> 1);
+    return(number_of_bits_set(a >> 1));
+}
+
+/*
+ * How many 0 bits are there at least significant end of Uint32.
+ * Low performance, do not call often.
+ */
+static int free_bits_at_bottom( Uint32 a )
+{
+      /* assume char is 8 bits */
+    if(!a) return sizeof(Uint32) * 8;
+    if(((Sint32)a) & 1l) return 0;
+    return 1 + free_bits_at_bottom ( a >> 1);
+}
+
+
+SDL_Overlay *SDL_CreateYUV_SW(_THIS, int width, int height, Uint32 format, SDL_Surface *display)
+{
+	SDL_Overlay *overlay;
+	struct private_yuvhwdata *swdata;
+	int *Cr_r_tab;
+	int *Cr_g_tab;
+	int *Cb_g_tab;
+	int *Cb_b_tab;
+	Uint32 *r_2_pix_alloc;
+	Uint32 *g_2_pix_alloc;
+	Uint32 *b_2_pix_alloc;
+	int i, cpu_mmx;
+	int CR, CB;
+	Uint32 Rmask, Gmask, Bmask;
+
+	/* Only RGB packed pixel conversion supported */
+	if ( (display->format->BytesPerPixel != 2) &&
+	     (display->format->BytesPerPixel != 3) &&
+	     (display->format->BytesPerPixel != 4) ) {
+		SDL_SetError("Can't use YUV data on non 16/24/32 bit surfaces");
+		return(NULL);
+	}
+
+	/* Verify that we support the format */
+	switch (format) {
+	    case SDL_YV12_OVERLAY:
+	    case SDL_IYUV_OVERLAY:
+	    case SDL_YUY2_OVERLAY:
+	    case SDL_UYVY_OVERLAY:
+	    case SDL_YVYU_OVERLAY:
+		break;
+	    default:
+		SDL_SetError("Unsupported YUV format");
+		return(NULL);
+	}
+
+	/* Create the overlay structure */
+	overlay = (SDL_Overlay *)malloc(sizeof *overlay);
+	if ( overlay == NULL ) {
+		SDL_OutOfMemory();
+		return(NULL);
+	}
+	memset(overlay, 0, (sizeof *overlay));
+
+	/* Fill in the basic members */
+	overlay->format = format;
+	overlay->w = width;
+	overlay->h = height;
+
+	/* Set up the YUV surface function structure */
+	overlay->hwfuncs = &sw_yuvfuncs;
+
+	/* Create the pixel data and lookup tables */
+	swdata = (struct private_yuvhwdata *)malloc(sizeof *swdata);
+	overlay->hwdata = swdata;
+	if ( swdata == NULL ) {
+		SDL_OutOfMemory();
+		SDL_FreeYUVOverlay(overlay);
+		return(NULL);
+	}
+	swdata->stretch = NULL;
+	swdata->display = display;
+	swdata->pixels = (Uint8 *) malloc(width*height*2);
+	swdata->colortab = (int *)malloc(4*256*sizeof(int));
+	Cr_r_tab = &swdata->colortab[0*256];
+	Cr_g_tab = &swdata->colortab[1*256];
+	Cb_g_tab = &swdata->colortab[2*256];
+	Cb_b_tab = &swdata->colortab[3*256];
+	swdata->rgb_2_pix = (Uint32 *)malloc(3*768*sizeof(Uint32));
+	r_2_pix_alloc = &swdata->rgb_2_pix[0*768];
+	g_2_pix_alloc = &swdata->rgb_2_pix[1*768];
+	b_2_pix_alloc = &swdata->rgb_2_pix[2*768];
+	if ( ! swdata->pixels || ! swdata->colortab || ! swdata->rgb_2_pix ) {
+		SDL_OutOfMemory();
+		SDL_FreeYUVOverlay(overlay);
+		return(NULL);
+	}
+
+	/* Generate the tables for the display surface */
+	for (i=0; i<256; i++) {
+		/* Gamma correction (luminescence table) and chroma correction
+		   would be done here.  See the Berkeley mpeg_play sources.
+		*/
+		CB = CR = (i-128);
+		Cr_r_tab[i] = (int) ( (0.419/0.299) * CR);
+		Cr_g_tab[i] = (int) (-(0.299/0.419) * CR);
+		Cb_g_tab[i] = (int) (-(0.114/0.331) * CB); 
+		Cb_b_tab[i] = (int) ( (0.587/0.331) * CB);
+	}
+
+	/* 
+	 * Set up entries 0-255 in rgb-to-pixel value tables.
+	 */
+	Rmask = display->format->Rmask;
+	Gmask = display->format->Gmask;
+	Bmask = display->format->Bmask;
+	for ( i=0; i<256; ++i ) {
+		r_2_pix_alloc[i+256] = i >> (8 - number_of_bits_set(Rmask));
+		r_2_pix_alloc[i+256] <<= free_bits_at_bottom(Rmask);
+		g_2_pix_alloc[i+256] = i >> (8 - number_of_bits_set(Gmask));
+		g_2_pix_alloc[i+256] <<= free_bits_at_bottom(Gmask);
+		b_2_pix_alloc[i+256] = i >> (8 - number_of_bits_set(Bmask));
+		b_2_pix_alloc[i+256] <<= free_bits_at_bottom(Bmask);
+	}
+
+	/*
+	 * If we have 16-bit output depth, then we double the value
+	 * in the top word. This means that we can write out both
+	 * pixels in the pixel doubling mode with one op. It is 
+	 * harmless in the normal case as storing a 32-bit value
+	 * through a short pointer will lose the top bits anyway.
+	 */
+	if( display->format->BytesPerPixel == 2 ) {
+		for ( i=0; i<256; ++i ) {
+			r_2_pix_alloc[i+256] |= (r_2_pix_alloc[i+256]) << 16;
+			g_2_pix_alloc[i+256] |= (g_2_pix_alloc[i+256]) << 16;
+			b_2_pix_alloc[i+256] |= (b_2_pix_alloc[i+256]) << 16;
+		}
+	}
+
+	/*
+	 * Spread out the values we have to the rest of the array so that
+	 * we do not need to check for overflow.
+	 */
+	for ( i=0; i<256; ++i ) {
+		r_2_pix_alloc[i] = r_2_pix_alloc[256];
+		r_2_pix_alloc[i+512] = r_2_pix_alloc[511];
+		g_2_pix_alloc[i] = g_2_pix_alloc[256];
+		g_2_pix_alloc[i+512] = g_2_pix_alloc[511];
+		b_2_pix_alloc[i] = b_2_pix_alloc[256];
+		b_2_pix_alloc[i+512] = b_2_pix_alloc[511];
+	}
+
+	/* You have chosen wisely... */
+	switch (format) {
+	    case SDL_YV12_OVERLAY:
+	    case SDL_IYUV_OVERLAY:
+		cpu_mmx = CPU_Flags() & MMX_CPU;
+		if ( display->format->BytesPerPixel == 2 ) {
+#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
+			/* inline assembly functions */
+			if ( cpu_mmx && (Rmask == 0xF800) &&
+			                (Gmask == 0x07E0) &&
+				        (Bmask == 0x001F) &&
+			                (width & 15) == 0) {
+/*printf("Using MMX 16-bit 565 dither\n");*/
+				swdata->Display1X = Color565DitherYV12MMX1X;
+			} else {
+/*printf("Using C 16-bit dither\n");*/
+				swdata->Display1X = Color16DitherYV12Mod1X;
+			}
+#else
+			swdata->Display1X = Color16DitherYV12Mod1X;
+#endif
+			swdata->Display2X = Color16DitherYV12Mod2X;
+		}
+		if ( display->format->BytesPerPixel == 3 ) {
+			swdata->Display1X = Color24DitherYV12Mod1X;
+			swdata->Display2X = Color24DitherYV12Mod2X;
+		}
+		if ( display->format->BytesPerPixel == 4 ) {
+#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
+			/* inline assembly functions */
+			if ( cpu_mmx && (Rmask == 0x00FF0000) &&
+			                (Gmask == 0x0000FF00) &&
+				        (Bmask == 0x000000FF) && 
+			                (width & 15) == 0) {
+/*printf("Using MMX 32-bit dither\n");*/
+				swdata->Display1X = ColorRGBDitherYV12MMX1X;
+			} else {
+/*printf("Using C 32-bit dither\n");*/
+				swdata->Display1X = Color32DitherYV12Mod1X;
+			}
+#else
+			swdata->Display1X = Color32DitherYV12Mod1X;
+#endif
+			swdata->Display2X = Color32DitherYV12Mod2X;
+		}
+		break;
+	    case SDL_YUY2_OVERLAY:
+	    case SDL_UYVY_OVERLAY:
+	    case SDL_YVYU_OVERLAY:
+		if ( display->format->BytesPerPixel == 2 ) {
+			swdata->Display1X = Color16DitherYUY2Mod1X;
+			swdata->Display2X = Color16DitherYUY2Mod2X;
+		}
+		if ( display->format->BytesPerPixel == 3 ) {
+			swdata->Display1X = Color24DitherYUY2Mod1X;
+			swdata->Display2X = Color24DitherYUY2Mod2X;
+		}
+		if ( display->format->BytesPerPixel == 4 ) {
+			swdata->Display1X = Color32DitherYUY2Mod1X;
+			swdata->Display2X = Color32DitherYUY2Mod2X;
+		}
+		break;
+	    default:
+		/* We should never get here (caught above) */
+		break;
+	}
+
+	/* Find the pitch and offset values for the overlay */
+	overlay->pitches = swdata->pitches;
+	overlay->pixels = swdata->planes;
+	switch (format) {
+	    case SDL_YV12_OVERLAY:
+	    case SDL_IYUV_OVERLAY:
+		overlay->pitches[0] = overlay->w;
+		overlay->pitches[1] = overlay->pitches[0] / 2;
+		overlay->pitches[2] = overlay->pitches[0] / 2;
+	        overlay->pixels[0] = swdata->pixels;
+	        overlay->pixels[1] = overlay->pixels[0] +
+		                     overlay->pitches[0] * overlay->h;
+	        overlay->pixels[2] = overlay->pixels[1] +
+		                     overlay->pitches[1] * overlay->h / 2;
+		overlay->planes = 3;
+		break;
+	    case SDL_YUY2_OVERLAY:
+	    case SDL_UYVY_OVERLAY:
+	    case SDL_YVYU_OVERLAY:
+		overlay->pitches[0] = overlay->w*2;
+	        overlay->pixels[0] = swdata->pixels;
+		overlay->planes = 1;
+		break;
+	    default:
+		/* We should never get here (caught above) */
+		break;
+	}
+
+	/* We're all done.. */
+	return(overlay);
+}
+
+int SDL_LockYUV_SW(_THIS, SDL_Overlay *overlay)
+{
+	return(0);
+}
+
+void SDL_UnlockYUV_SW(_THIS, SDL_Overlay *overlay)
+{
+	return;
+}
+
+int SDL_DisplayYUV_SW(_THIS, SDL_Overlay *overlay, SDL_Rect *dstrect)
+{
+	struct private_yuvhwdata *swdata;
+	SDL_Surface *stretch;
+	SDL_Surface *display;
+	int scale_2x;
+	Uint8 *lum, *Cr, *Cb;
+	Uint8 *dst;
+	int mod;
+
+	swdata = overlay->hwdata;
+	scale_2x = 0;
+	stretch = 0;
+	if ( (overlay->w != dstrect->w) || (overlay->h != dstrect->h) ) {
+		if ( (dstrect->w == 2*overlay->w) &&
+		     (dstrect->h == 2*overlay->h) ) {
+			scale_2x = 1;
+		} else {
+			if ( ! swdata->stretch ) {
+				display = swdata->display;
+				swdata->stretch = SDL_CreateRGBSurface(
+					SDL_SWSURFACE,
+					overlay->w, overlay->h,
+					display->format->BitsPerPixel,
+					display->format->Rmask,
+					display->format->Gmask,
+					display->format->Bmask, 0);
+				if ( ! swdata->stretch ) {
+					return(-1);
+				}
+			}
+			stretch = swdata->stretch;
+		}
+	}
+
+	if ( stretch ) {
+		display = stretch;
+	} else {
+		display = swdata->display;
+	}
+	switch (overlay->format) {
+	    case SDL_YV12_OVERLAY:
+		lum = overlay->pixels[0];
+		Cr =  overlay->pixels[1];
+		Cb =  overlay->pixels[2];
+		break;
+	    case SDL_IYUV_OVERLAY:
+		lum = overlay->pixels[0];
+		Cr =  overlay->pixels[2];
+		Cb =  overlay->pixels[1];
+		break;
+	    case SDL_YUY2_OVERLAY:
+		lum = overlay->pixels[0];
+		Cr = lum + 3;
+		Cb = lum + 1;
+		break;
+	    case SDL_UYVY_OVERLAY:
+		lum = overlay->pixels[0]+1;
+		Cr = lum + 1;
+		Cb = lum - 1;
+		break;
+	    case SDL_YVYU_OVERLAY:
+		lum = overlay->pixels[0];
+		Cr = lum + 1;
+		Cb = lum + 3;
+		break;
+	    default:
+		SDL_SetError("Unsupported YUV format in blit (??)");
+		return(-1);
+	}
+	if ( SDL_MUSTLOCK(display) ) {
+        	if ( SDL_LockSurface(display) < 0 ) {
+			return(-1);
+		}
+	}
+	if ( stretch ) {
+		dst = (Uint8 *)stretch->pixels;
+	} else {
+		dst = (Uint8 *)display->pixels
+			+ dstrect->x * display->format->BytesPerPixel
+			+ dstrect->y * display->pitch;
+	}
+	mod = (display->pitch / display->format->BytesPerPixel);
+
+	if ( scale_2x ) {
+		mod -= (overlay->w * 2);
+		swdata->Display2X(swdata->colortab, swdata->rgb_2_pix,
+		                  lum, Cr, Cb, dst, overlay->h, overlay->w,mod);
+	} else {
+		mod -= overlay->w;
+		swdata->Display1X(swdata->colortab, swdata->rgb_2_pix,
+		                  lum, Cr, Cb, dst, overlay->h, overlay->w,mod);
+	}
+	if ( SDL_MUSTLOCK(display) ) {
+		SDL_UnlockSurface(display);
+	}
+	if ( stretch ) {
+		display = swdata->display;
+		SDL_SoftStretch(stretch, NULL, display, dstrect);
+	}
+	SDL_UpdateRects(display, 1, dstrect);
+
+	return(0);
+}
+
+void SDL_FreeYUV_SW(_THIS, SDL_Overlay *overlay)
+{
+	struct private_yuvhwdata *swdata;
+
+	swdata = overlay->hwdata;
+	if ( swdata ) {
+		if ( swdata->pixels ) {
+			free(swdata->pixels);
+		}
+		if ( swdata->colortab ) {
+			free(swdata->colortab);
+		}
+		if ( swdata->rgb_2_pix ) {
+			free(swdata->rgb_2_pix);
+		}
+		free(swdata);
+	}
+}