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636 lines
15 KiB
C
636 lines
15 KiB
C
// SONIC ROBO BLAST 2
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//-----------------------------------------------------------------------------
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// Copyright (C) 2013-2016 by Matthew "Inuyasha" Walsh.
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// Copyright (C) 2013 by "Ninji".
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// Copyright (C) 2013-2016 by Sonic Team Junior.
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//
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// This program is free software distributed under the
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// terms of the GNU General Public License, version 2.
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// See the 'LICENSE' file for more details.
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//-----------------------------------------------------------------------------
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/// \file m_anigif.c
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/// \brief Animated GIF creation movie mode.
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/// Uses an implementation of Lempel–Ziv–Welch (LZW) compression,
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/// which by-the-way: the patents have expired for over ten years ago.
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#include "m_anigif.h"
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#include "d_main.h"
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#include "z_zone.h"
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#include "v_video.h"
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#include "i_video.h"
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// GIFs are always little-endian
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#include "byteptr.h"
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consvar_t cv_gif_optimize = {"gif_optimize", "On", CV_SAVE, CV_OnOff, NULL, 0, NULL, NULL, 0, 0, NULL};
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consvar_t cv_gif_downscale = {"gif_downscale", "On", CV_SAVE, CV_OnOff, NULL, 0, NULL, NULL, 0, 0, NULL};
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#ifdef HAVE_ANIGIF
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static boolean gif_optimize = false; // So nobody can do something dumb
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static boolean gif_downscale = false; // like changing cvars mid output
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static FILE *gif_out = NULL;
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static INT32 gif_frames = 0;
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static UINT8 gif_writeover = 0;
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// OPTIMIZE gif output
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// ---
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//
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// GIF_optimizecmprow
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// checks a row for modification, and if any is detected, what parts
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// modified input 'last': returns current row if modification detected
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// modified input 'left': returns leftmost known changed pixel
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// modified input 'right': returns rightmost known changed pixel
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//
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static UINT8 GIF_optimizecmprow(const UINT8 *dst, const UINT8 *src, INT32 row,
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INT32 *last, INT32 *left, INT32 *right)
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{
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const UINT8 *dp = dst + (vid.width * row);
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const UINT8 *sp = src + (vid.width * row);
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const UINT8 *dtmp, *stmp;
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UINT8 doleft = 1, doright = 1;
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INT32 i = 0;
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if (!memcmp(sp, dp, vid.width))
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return 0; // unchanged.
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*last = row;
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// left side
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i = 0;
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if (*left == 0) // edge reached
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doleft = 0;
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else if (*left > 0) // left set, nonzero
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{
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if (!memcmp(sp, dp, *left))
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doleft = 0; // left side not changed
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}
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while (doleft)
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{
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dtmp = dp + i;
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stmp = sp + i;
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if (*dtmp != *stmp)
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{
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doleft = 0;
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*left = i;
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}
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++i;
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}
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// right side
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i = vid.width - 1;
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if (*right == vid.width - 1) // edge reached
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doright = 0;
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else if (*right >= 0) // right set, non-end-of-width
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{
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dtmp = dp + *right + 1;
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stmp = sp + *right + 1;
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if (!memcmp(stmp, dtmp, vid.width - (*right + 1)))
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doright = 0; // right side not changed
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}
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while (doright)
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{
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dtmp = dp + i;
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stmp = sp + i;
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if (*dtmp != *stmp)
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{
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doright = 0;
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*right = i;
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}
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--i;
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}
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return 1;
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}
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//
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// GIF_optimizeregion
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// attempts to optimize a GIF as it's being written by giving a region
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// containing all of the changed pixels instead of rewriting
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// the entire screen buffer to the GIF file every frame
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// modified input 'x': returns optimal starting x coordinate
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// modified input 'y': returns optimal starting y coordinate
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// modified input 'w': returns optimal width
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// modified input 'h': returns optimal height
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//
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static void GIF_optimizeregion(const UINT8 *dst, const UINT8 *src,
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INT32 *x, INT32 *y, INT32 *w, INT32 *h)
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{
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INT32 st = 0, sb = vid.height - 1; // work from both directions
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INT32 firstchg_t = -1, firstchg_b = -1; // store first changed row.
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INT32 lastchg_t = -1, lastchg_b = -1; // Store last row... just in case
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INT32 lmpix = -1, rmpix = -1; // store left and rightmost change
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UINT8 stopt = 0, stopb = 0;
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while ((!stopt || !stopb) && st < sb)
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{
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if (!stopt)
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{
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if (GIF_optimizecmprow(dst, src, st++, &lastchg_t, &lmpix, &rmpix)
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&& lmpix == 0 && rmpix == vid.width - 1)
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stopt = 1;
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if (firstchg_t < 0 && lastchg_t >= 0)
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firstchg_t = lastchg_t;
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}
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if (!stopb)
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{
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if (GIF_optimizecmprow(dst, src, sb--, &lastchg_b, &lmpix, &rmpix)
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&& lmpix == 0 && rmpix == vid.width - 1)
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stopb = 1;
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if (firstchg_b < 0 && lastchg_b >= 0)
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firstchg_b = lastchg_b;
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}
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}
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if (lmpix < 0) // NO CHANGE.
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{
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// hack: we don't attempt to go back and rewrite the previous
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// frame's delay, we just make this frame have only a single
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// pixel so it contains minimal data
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*x = *y = 0;
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*w = *h = 1;
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return;
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}
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*x = lmpix;
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*y = (firstchg_t < 0 && lastchg_b >= 0) ? lastchg_b : firstchg_t;
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*w = rmpix + 1;
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*h = ((firstchg_b < 0 && lastchg_t >= 0) ? lastchg_t : firstchg_b) + 1;
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*w -= *x;
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*h -= *y;
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}
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// GIF Bit WRiter
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// ---
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static UINT8 *gifbwr_buf = NULL;
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static UINT8 *gifbwr_cur;
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static UINT8 gifbwr_bufsize = 0;
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static UINT32 gifbwr_bits_buf = 0;
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static INT32 gifbwr_bits_num = 0;
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static UINT8 gifbwr_bits_min = 9;
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//
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// GIF_bwr_flush
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// flushes any bits remaining in the buffer.
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//
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static void GIF_bwrflush(void)
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{
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if (gifbwr_bits_num > 0) // will be between 1 and 7
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{
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WRITEUINT8(gifbwr_cur, (UINT8)(gifbwr_bits_buf&0xFF));
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++gifbwr_bufsize;
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}
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gifbwr_bits_buf = gifbwr_bits_num = 0;
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}
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//
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// GIF_bwr_write
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// writes bits into bit buffer,
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// writes into buffer when whole bytes obtained
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//
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static void GIF_bwrwrite(UINT32 idata)
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{
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gifbwr_bits_buf |= (idata << gifbwr_bits_num);
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gifbwr_bits_num += gifbwr_bits_min;
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while (gifbwr_bits_num >= 8)
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{
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WRITEUINT8(gifbwr_cur, (UINT8)(gifbwr_bits_buf&0xFF));
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gifbwr_bits_buf >>= 8;
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gifbwr_bits_num -= 8;
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++gifbwr_bufsize;
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}
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}
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// SCReen BUFfer (obviously)
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// ---
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static UINT8 *scrbuf_pos;
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static UINT8 *scrbuf_linebegin;
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static UINT8 *scrbuf_lineend;
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static UINT8 *scrbuf_writeend;
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static INT16 scrbuf_downscaleamt = 1;
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// GIF LZW algorithm
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// ---
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#define GIFLZW_TABLECLR 0x100
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#define GIFLZW_DATAEND 0x101
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#define GIFLZW_DICTSTART 0x102
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#define GIFLZW_MAXCODE 4096
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static UINT16 giflzw_workingCode;
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static UINT16 giflzw_nextCodeToAssign;
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static UINT32 *giflzw_hashTable = NULL; // 16384 required
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//
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// GIF_prepareLZW
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// prepatres the LZW hash table for use
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//
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static void GIF_prepareLZW(void)
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{
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gifbwr_bits_min = 9;
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giflzw_nextCodeToAssign = GIFLZW_DICTSTART;
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if (!giflzw_hashTable)
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giflzw_hashTable = Z_Malloc(16384*sizeof(UINT32), PU_STATIC, NULL);
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memset(giflzw_hashTable, 0, 16384*sizeof(UINT32));
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}
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//
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// GIF_searchHash
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// searches the LZW hash table for a match
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//
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static char GIF_searchHash(UINT32 key, UINT32 *pOutput)
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{
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UINT32 entry, position = (key >> 6) & 0x3FFF;
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while (giflzw_hashTable[position] != 0)
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{
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entry = giflzw_hashTable[position];
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if ((entry >> 12) == key)
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{
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*pOutput = (entry & 0xFFF);
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return 1;
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}
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position = (position + 1) & 0x3FFF;
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}
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return 0;
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}
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//
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// GIF_addHash
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// stores a hash in the hash table
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//
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static void GIF_addHash(UINT32 key, UINT32 value)
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{
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UINT32 position = (key >> 6) & 0x3FFF;
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for (;;)
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{
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if (giflzw_hashTable[position] == 0)
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{
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giflzw_hashTable[position] = (key << 12) | (value & 0xFFF);
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return;
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}
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position = (position + 1) & 0x3FFF;
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}
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}
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//
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// GIF_feedByte
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// feeds bytes into the working code,
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// and to the hash table or output from there.
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//
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static void GIF_feedByte(UINT8 pbyte)
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{
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UINT32 key, hashOutput = 0;
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// Prepare a code with this byte if we have none
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if (giflzw_workingCode == UINT16_MAX)
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{
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giflzw_workingCode = pbyte;
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return;
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}
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// If we're here, this means we have a code in progress
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// Is this string already in the dictionary?
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key = (giflzw_workingCode << 8) | pbyte;
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if (0 == GIF_searchHash(key, &hashOutput))
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{
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// It wasn't found.
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// That means we can output what we already had, and
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// create a new dictionary entry containing that
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// plus our new byte.
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if (giflzw_nextCodeToAssign > (1 << gifbwr_bits_min))
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++gifbwr_bits_min; // out of room, extend minbits
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GIF_bwrwrite(giflzw_workingCode);
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GIF_addHash(key, giflzw_nextCodeToAssign);
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++giflzw_nextCodeToAssign;
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// Seed the working code with this byte, for the next
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// round
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giflzw_workingCode = pbyte;
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return;
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}
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// This string is in there, so update our working code!
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giflzw_workingCode = hashOutput;
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}
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//
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// GIF_lzw
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// polls the hashtable, does writing, etc
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//
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static void GIF_lzw(void)
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{
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while (scrbuf_pos <= scrbuf_writeend)
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{
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GIF_feedByte(*scrbuf_pos);
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if (giflzw_nextCodeToAssign >= GIFLZW_MAXCODE)
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{
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GIF_bwrwrite(GIFLZW_TABLECLR);
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GIF_prepareLZW();
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}
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if ((scrbuf_pos += scrbuf_downscaleamt) >= scrbuf_lineend)
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{
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scrbuf_lineend += (vid.width * scrbuf_downscaleamt);
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scrbuf_linebegin += (vid.width * scrbuf_downscaleamt);
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scrbuf_pos = scrbuf_linebegin;
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}
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// Just a bit of overflow prevention
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if (gifbwr_bufsize >= 248)
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break;
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}
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if (scrbuf_pos > scrbuf_writeend)
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{
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// 4.15.14 - I failed to account for the possibility that
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// these two writes could possibly cause minbits increases.
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// Luckily, we have a guarantee that the first byte CANNOT exceed
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// the maximum possible code. So, we do a minbits check here...
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if (giflzw_nextCodeToAssign++ > (1 << gifbwr_bits_min))
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++gifbwr_bits_min; // out of room, extend minbits
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GIF_bwrwrite(giflzw_workingCode);
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// And luckily once more, if the data marker somehow IS at
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// MAXCODE it doesn't matter, because it still marks the
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// end of the stream and thus no extending will happen!
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// But still, we need to check minbits again...
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if (giflzw_nextCodeToAssign++ > (1 << gifbwr_bits_min))
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++gifbwr_bits_min; // out of room, extend minbits
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GIF_bwrwrite(GIFLZW_DATAEND);
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// Okay, the flush is safe at least.
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GIF_bwrflush();
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gif_writeover = 1;
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}
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}
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// GIF HEADer (okay yeah)
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// ---
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const UINT8 gifhead_base[6] = {0x47,0x49,0x46,0x38,0x39,0x61}; // GIF89a
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const UINT8 gifhead_nsid[19] = {0x21,0xFF,0x0B, // extension block + size
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0x4E,0x45,0x54,0x53,0x43,0x41,0x50,0x45,0x32,0x2E,0x30, // NETSCAPE2.0
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0x03,0x01,0xFF,0xFF,0x00}; // sub-block, repetitions
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//
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// GIF_headwrite
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// writes the gif header to the currently open output file.
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// NOTE that this code does not accomodate for palette changes.
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//
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static void GIF_headwrite(void)
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{
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UINT8 *gifhead = Z_Malloc(800, PU_STATIC, NULL);
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UINT8 *p = gifhead;
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RGBA_t *c;
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INT32 i;
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UINT16 rwidth, rheight;
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if (!gif_out)
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return;
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WRITEMEM(p, gifhead_base, sizeof(gifhead_base));
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// Image width/height
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if (gif_downscale)
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{
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scrbuf_downscaleamt = vid.dupx;
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rwidth = (vid.width / scrbuf_downscaleamt);
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rheight = (vid.height / scrbuf_downscaleamt);
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}
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else
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{
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scrbuf_downscaleamt = 1;
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rwidth = vid.width;
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rheight = vid.height;
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}
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WRITEUINT16(p, rwidth);
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WRITEUINT16(p, rheight);
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// colors, aspect, etc
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WRITEUINT8(p, 0xF7);
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WRITEUINT8(p, 0x00);
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WRITEUINT8(p, 0x00);
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// write color table
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for (i = 0; i < 256; ++i)
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{
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c = &pLocalPalette[i];
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WRITEUINT8(p, c->s.red);
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WRITEUINT8(p, c->s.green);
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WRITEUINT8(p, c->s.blue);
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}
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// write extension block
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WRITEMEM(p, gifhead_nsid, sizeof(gifhead_nsid));
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// write to file and be done with it!
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fwrite(gifhead, 1, 800, gif_out);
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Z_Free(gifhead);
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}
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// GIF FRAME (surprise!)
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// ---
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const UINT8 gifframe_gchead[4] = {0x21,0xF9,0x04,0x04}; // GCE, bytes, packed byte (no trans = 0 | no input = 0 | don't remove = 4)
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static UINT8 *gifframe_data = NULL;
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static size_t gifframe_size = 8192;
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//
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// GIF_framewrite
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// writes a frame into the file.
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//
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static void GIF_framewrite(void)
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{
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UINT8 *p;
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UINT8 *movie_screen = screens[2];
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INT32 blitx, blity, blitw, blith;
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if (!gifframe_data)
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gifframe_data = Z_Malloc(gifframe_size, PU_STATIC, NULL);
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p = gifframe_data;
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if (!gif_out)
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return;
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// Compare image data (for optimizing GIF)
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if (gif_optimize && gif_frames > 0)
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{
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// before blit movie_screen points to last frame, cur_screen points to this frame
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UINT8 *cur_screen = screens[0];
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GIF_optimizeregion(cur_screen, movie_screen, &blitx, &blity, &blitw, &blith);
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// blit to temp screen
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I_ReadScreen(movie_screen);
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}
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else
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{
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blitx = blity = 0;
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blitw = vid.width;
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blith = vid.height;
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if (gif_frames == 0)
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I_ReadScreen(movie_screen);
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movie_screen = screens[0];
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}
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// screen regions are handled in GIF_lzw
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{
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int d1 = (int)((100.0/NEWTICRATE)*(gif_frames+1));
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int d2 = (int)((100.0/NEWTICRATE)*(gif_frames));
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UINT16 delay = d1-d2;
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INT32 startline;
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WRITEMEM(p, gifframe_gchead, 4);
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WRITEUINT16(p, delay);
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WRITEUINT8(p, 0);
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WRITEUINT8(p, 0); // end of GCE
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if (scrbuf_downscaleamt > 1)
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{
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// Ensure our downscaled blitx/y starts and ends on a pixel.
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blitx -= (blitx % scrbuf_downscaleamt);
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blity -= (blity % scrbuf_downscaleamt);
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blitw = ((blitw + (scrbuf_downscaleamt - 1)) / scrbuf_downscaleamt) * scrbuf_downscaleamt;
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blith = ((blith + (scrbuf_downscaleamt - 1)) / scrbuf_downscaleamt) * scrbuf_downscaleamt;
|
||
}
|
||
|
||
WRITEUINT8(p, 0x2C);
|
||
WRITEUINT16(p, (UINT16)(blitx / scrbuf_downscaleamt));
|
||
WRITEUINT16(p, (UINT16)(blity / scrbuf_downscaleamt));
|
||
WRITEUINT16(p, (UINT16)(blitw / scrbuf_downscaleamt));
|
||
WRITEUINT16(p, (UINT16)(blith / scrbuf_downscaleamt));
|
||
WRITEUINT8(p, 0); // no local table of colors
|
||
|
||
scrbuf_pos = movie_screen + blitx + (blity * vid.width);
|
||
scrbuf_writeend = scrbuf_pos + (blitw - 1) + ((blith - 1) * vid.width);
|
||
|
||
if (!gifbwr_buf)
|
||
gifbwr_buf = Z_Malloc(256, PU_STATIC, NULL);
|
||
gifbwr_cur = gifbwr_buf;
|
||
|
||
GIF_prepareLZW();
|
||
giflzw_workingCode = UINT16_MAX;
|
||
WRITEUINT8(p, gifbwr_bits_min - 1);
|
||
|
||
startline = (scrbuf_pos - movie_screen) / vid.width;
|
||
scrbuf_linebegin = movie_screen + (startline * vid.width) + blitx;
|
||
scrbuf_lineend = scrbuf_linebegin + blitw;
|
||
|
||
//prewrite a table clear
|
||
GIF_bwrwrite(GIFLZW_TABLECLR);
|
||
|
||
gif_writeover = 0;
|
||
while (!gif_writeover)
|
||
{
|
||
GIF_lzw(); // main lzw packing loop
|
||
|
||
if ((size_t)(p - gifframe_data) + gifbwr_bufsize + 1 >= gifframe_size)
|
||
{
|
||
INT32 temppos = p - gifframe_data;
|
||
gifframe_data = Z_Realloc(gifframe_data, (gifframe_size *= 2), PU_STATIC, NULL);
|
||
p = gifframe_data + temppos; // realloc moves gifframe_data, so p is now invalid
|
||
}
|
||
|
||
// reset after writing to read
|
||
gifbwr_cur = gifbwr_buf;
|
||
WRITEUINT8(p, gifbwr_bufsize);
|
||
WRITEMEM(p, gifbwr_cur, gifbwr_bufsize);
|
||
|
||
gifbwr_bufsize = 0;
|
||
gifbwr_cur = gifbwr_buf;
|
||
}
|
||
WRITEUINT8(p, 0); //terminator
|
||
}
|
||
fwrite(gifframe_data, 1, (p - gifframe_data), gif_out);
|
||
++gif_frames;
|
||
}
|
||
|
||
|
||
|
||
// ========================
|
||
// !!! PUBLIC FUNCTIONS !!!
|
||
// ========================
|
||
|
||
//
|
||
// GIF_open
|
||
// opens a new file for writing.
|
||
//
|
||
INT32 GIF_open(const char *filename)
|
||
{
|
||
#ifdef HWRENDER
|
||
if (rendermode != render_soft)
|
||
{
|
||
CONS_Alert(CONS_WARNING, M_GetText("GIFs cannot be taken in non-software modes!\n"));
|
||
return 0;
|
||
}
|
||
#endif
|
||
|
||
gif_out = fopen(filename, "wb");
|
||
if (!gif_out)
|
||
return 0;
|
||
|
||
gif_optimize = (!!cv_gif_optimize.value);
|
||
gif_downscale = (!!cv_gif_downscale.value);
|
||
GIF_headwrite();
|
||
gif_frames = 0;
|
||
return 1;
|
||
}
|
||
|
||
//
|
||
// GIF_frame
|
||
// writes a frame into the output gif
|
||
//
|
||
void GIF_frame(void)
|
||
{
|
||
// there's not much actually needed here, is there.
|
||
GIF_framewrite();
|
||
}
|
||
|
||
//
|
||
// GIF_close
|
||
// closes output GIF
|
||
//
|
||
INT32 GIF_close(void)
|
||
{
|
||
if (!gif_out)
|
||
return 0;
|
||
|
||
// final terminator.
|
||
fwrite(";", 1, 1, gif_out);
|
||
fclose(gif_out);
|
||
gif_out = NULL;
|
||
|
||
if (gifbwr_buf)
|
||
Z_Free(gifbwr_buf);
|
||
gifbwr_buf = gifbwr_cur = NULL;
|
||
|
||
if (gifframe_data)
|
||
Z_Free(gifframe_data);
|
||
gifframe_data = NULL;
|
||
|
||
if (giflzw_hashTable)
|
||
Z_Free(giflzw_hashTable);
|
||
giflzw_hashTable = NULL;
|
||
|
||
CONS_Printf(M_GetText("Animated gif closed; wrote %d frames\n"), gif_frames);
|
||
return 1;
|
||
}
|
||
#endif //ifdef HAVE_ANIGIF
|