src/video/SDL_RLEaccel.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 04 Jan 2004 16:49:27 +0000
changeset 769 b8d311d90021
parent 739 22dbf364c017
child 879 2bacec7930b1
permissions -rw-r--r--
Updated copyright information for 2004 (Happy New Year!)
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2004 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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 "@(#) $Id$";
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#endif
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/*
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 * RLE encoding for software colorkey and alpha-channel acceleration
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 *
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 * Original version by Sam Lantinga
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 *
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 * Mattias Engdegård (Yorick): Rewrite. New encoding format, encoder and
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 * decoder. Added per-surface alpha blitter. Added per-pixel alpha
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 * format, encoder and blitter.
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 *
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 * Many thanks to Xark and johns for hints, benchmarks and useful comments
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 * leading to this code.
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 *
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 * Welcome to Macro Mayhem.
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 */
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/*
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 * The encoding translates the image data to a stream of segments of the form
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 *
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 * <skip> <run> <data>
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 *
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 * where <skip> is the number of transparent pixels to skip,
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 *       <run>  is the number of opaque pixels to blit,
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 * and   <data> are the pixels themselves.
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 *
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 * This basic structure is used both for colorkeyed surfaces, used for simple
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 * binary transparency and for per-surface alpha blending, and for surfaces
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 * with per-pixel alpha. The details differ, however:
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 *
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 * Encoding of colorkeyed surfaces:
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 *
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 *   Encoded pixels always have the same format as the target surface.
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 *   <skip> and <run> are unsigned 8 bit integers, except for 32 bit depth
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 *   where they are 16 bit. This makes the pixel data aligned at all times.
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 *   Segments never wrap around from one scan line to the next.
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 *
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 *   The end of the sequence is marked by a zero <skip>,<run> pair at the *
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 *   beginning of a line.
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 *
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 * Encoding of surfaces with per-pixel alpha:
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 *
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 *   The sequence begins with a struct RLEDestFormat describing the target
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 *   pixel format, to provide reliable un-encoding.
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 *
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 *   Each scan line is encoded twice: First all completely opaque pixels,
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 *   encoded in the target format as described above, and then all
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 *   partially transparent (translucent) pixels (where 1 <= alpha <= 254),
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 *   in the following 32-bit format:
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 *
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 *   For 32-bit targets, each pixel has the target RGB format but with
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 *   the alpha value occupying the highest 8 bits. The <skip> and <run>
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 *   counts are 16 bit.
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 * 
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 *   For 16-bit targets, each pixel has the target RGB format, but with
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 *   the middle component (usually green) shifted 16 steps to the left,
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 *   and the hole filled with the 5 most significant bits of the alpha value.
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 *   i.e. if the target has the format         rrrrrggggggbbbbb,
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 *   the encoded pixel will be 00000gggggg00000rrrrr0aaaaabbbbb.
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 *   The <skip> and <run> counts are 8 bit for the opaque lines, 16 bit
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 *   for the translucent lines. Two padding bytes may be inserted
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 *   before each translucent line to keep them 32-bit aligned.
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 *
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 *   The end of the sequence is marked by a zero <skip>,<run> pair at the
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 *   beginning of an opaque line.
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "SDL_types.h"
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#include "SDL_video.h"
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#include "SDL_error.h"
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#include "SDL_sysvideo.h"
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#include "SDL_blit.h"
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#include "SDL_memops.h"
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#include "SDL_RLEaccel_c.h"
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#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
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#include "mmx.h"
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#include "SDL_cpuinfo.h"
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#endif
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#ifndef MAX
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#define MAX(a, b) ((a) > (b) ? (a) : (b))
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#endif
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#ifndef MIN
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#define MIN(a, b) ((a) < (b) ? (a) : (b))
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#endif
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#define PIXEL_COPY(to, from, len, bpp)			\
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do {							\
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    if(bpp == 4) {					\
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	SDL_memcpy4(to, from, (unsigned)(len));		\
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    } else {						\
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	SDL_memcpy(to, from, (unsigned)(len) * (bpp));	\
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    }							\
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} while(0)
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/*
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 * Various colorkey blit methods, for opaque and per-surface alpha
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 */
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#define OPAQUE_BLIT(to, from, length, bpp, alpha)	\
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    PIXEL_COPY(to, from, length, bpp)
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#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
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#define ALPHA_BLIT32_888MMX(to, from, length, bpp, alpha)	\
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    do {							\
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	Uint32 *srcp = (Uint32 *)(from);			\
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	Uint32 *dstp = (Uint32 *)(to);				\
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        int i = 0x00FF00FF;					\
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        movd_m2r(*(&i), mm3);					\
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        punpckldq_r2r(mm3, mm3);				\
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        i = 0xFF000000;						\
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        movd_m2r(*(&i), mm7);					\
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        punpckldq_r2r(mm7, mm7);				\
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        i = alpha | alpha << 16;				\
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        movd_m2r(*(&i), mm4);					\
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        punpckldq_r2r(mm4, mm4);				\
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	pcmpeqd_r2r(mm5,mm5); /* set mm5 to "1" */		\
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	pxor_r2r(mm7, mm5); /* make clear alpha mask */		\
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        i = length;						\
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	if(i & 1) {						\
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          movd_m2r((*srcp), mm1); /* src -> mm1 */		\
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          punpcklbw_r2r(mm1, mm1);				\
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          pand_r2r(mm3, mm1);					\
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	  movd_m2r((*dstp), mm2); /* dst -> mm2 */		\
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          punpcklbw_r2r(mm2, mm2);				\
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          pand_r2r(mm3, mm2);					\
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	  psubw_r2r(mm2, mm1);					\
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	  pmullw_r2r(mm4, mm1);					\
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	  psrlw_i2r(8, mm1);					\
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	  paddw_r2r(mm1, mm2);					\
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	  pand_r2r(mm3, mm2);					\
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	  packuswb_r2r(mm2, mm2);				\
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	  pand_r2r(mm5, mm2); /* 00000RGB -> mm2 */		\
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	  movd_r2m(mm2, *dstp);					\
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	  ++srcp;						\
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	  ++dstp;						\
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	  i--;							\
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	}							\
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	for(; i > 0; --i) {					\
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          movq_m2r((*srcp), mm0);				\
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	  movq_r2r(mm0, mm1);					\
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          punpcklbw_r2r(mm0, mm0);				\
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	  movq_m2r((*dstp), mm2);				\
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	  punpckhbw_r2r(mm1, mm1);				\
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	  movq_r2r(mm2, mm6);					\
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          pand_r2r(mm3, mm0);					\
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          punpcklbw_r2r(mm2, mm2);				\
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	  pand_r2r(mm3, mm1);					\
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	  punpckhbw_r2r(mm6, mm6);				\
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          pand_r2r(mm3, mm2);					\
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	  psubw_r2r(mm2, mm0);					\
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	  pmullw_r2r(mm4, mm0);					\
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	  pand_r2r(mm3, mm6);					\
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	  psubw_r2r(mm6, mm1);					\
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	  pmullw_r2r(mm4, mm1);					\
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	  psrlw_i2r(8, mm0);					\
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	  paddw_r2r(mm0, mm2);					\
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	  psrlw_i2r(8, mm1);					\
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	  paddw_r2r(mm1, mm6);					\
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	  pand_r2r(mm3, mm2);					\
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	  pand_r2r(mm3, mm6);					\
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	  packuswb_r2r(mm2, mm2);				\
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	  packuswb_r2r(mm6, mm6);				\
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	  psrlq_i2r(32, mm2);					\
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	  psllq_i2r(32, mm6);					\
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	  por_r2r(mm6, mm2);					\
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	  pand_r2r(mm5, mm2); /* 00000RGB -> mm2 */		\
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         movq_r2m(mm2, *dstp);					\
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	  srcp += 2;						\
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	  dstp += 2;						\
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	  i--;							\
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	}							\
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	emms();							\
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    } while(0)
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#define ALPHA_BLIT16_565MMX(to, from, length, bpp, alpha)	\
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    do {						\
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        int i, n = 0;					\
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	Uint16 *srcp = (Uint16 *)(from);		\
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	Uint16 *dstp = (Uint16 *)(to);			\
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        Uint32 ALPHA = 0xF800;				\
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	movd_m2r(*(&ALPHA), mm1);			\
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        punpcklwd_r2r(mm1, mm1);			\
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        punpcklwd_r2r(mm1, mm1);			\
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	ALPHA = 0x07E0;					\
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	movd_m2r(*(&ALPHA), mm4);			\
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        punpcklwd_r2r(mm4, mm4);			\
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        punpcklwd_r2r(mm4, mm4);			\
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	ALPHA = 0x001F;					\
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	movd_m2r(*(&ALPHA), mm7);			\
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        punpcklwd_r2r(mm7, mm7);			\
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        punpcklwd_r2r(mm7, mm7);			\
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	alpha &= ~(1+2+4);				\
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        i = (Uint32)alpha | (Uint32)alpha << 16;	\
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        movd_m2r(*(&i), mm0);				\
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        punpckldq_r2r(mm0, mm0);			\
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        ALPHA = alpha >> 3;				\
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        i = ((int)(length) & 3);			\
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	for(; i > 0; --i) {				\
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	    Uint32 s = *srcp++;				\
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	    Uint32 d = *dstp;				\
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	    s = (s | s << 16) & 0x07e0f81f;		\
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	    d = (d | d << 16) & 0x07e0f81f;		\
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	    d += (s - d) * ALPHA >> 5;			\
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	    d &= 0x07e0f81f;				\
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	    *dstp++ = d | d >> 16;			\
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	    n++;					\
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	}						\
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	i = (int)(length) - n;				\
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	for(; i > 0; --i) {				\
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	  movq_m2r((*dstp), mm3);			\
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	  movq_m2r((*srcp), mm2);			\
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	  movq_r2r(mm2, mm5);				\
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	  pand_r2r(mm1 , mm5);				\
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	  psrlq_i2r(11, mm5);				\
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	  movq_r2r(mm3, mm6);				\
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	  pand_r2r(mm1 , mm6);				\
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	  psrlq_i2r(11, mm6);				\
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	  psubw_r2r(mm6, mm5);				\
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	  pmullw_r2r(mm0, mm5);				\
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	  psrlw_i2r(8, mm5);				\
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	  paddw_r2r(mm5, mm6);				\
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	  psllq_i2r(11, mm6);				\
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	  pand_r2r(mm1, mm6);				\
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	  movq_r2r(mm4, mm5);				\
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	  por_r2r(mm7, mm5);				\
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	  pand_r2r(mm5, mm3);				\
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	  por_r2r(mm6, mm3);				\
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	  movq_r2r(mm2, mm5);				\
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	  pand_r2r(mm4 , mm5);				\
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	  psrlq_i2r(5, mm5);				\
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	  movq_r2r(mm3, mm6);				\
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	  pand_r2r(mm4 , mm6);				\
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	  psrlq_i2r(5, mm6);				\
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	  psubw_r2r(mm6, mm5);				\
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	  pmullw_r2r(mm0, mm5);				\
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	  psrlw_i2r(8, mm5);				\
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	  paddw_r2r(mm5, mm6);				\
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	  psllq_i2r(5, mm6);				\
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	  pand_r2r(mm4, mm6);				\
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	  movq_r2r(mm1, mm5);				\
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	  por_r2r(mm7, mm5);				\
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	  pand_r2r(mm5, mm3);				\
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	  por_r2r(mm6, mm3);				\
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	  movq_r2r(mm2, mm5);				\
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	  pand_r2r(mm7 , mm5);				\
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          movq_r2r(mm3, mm6);				\
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	  pand_r2r(mm7 , mm6);				\
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	  psubw_r2r(mm6, mm5);				\
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	  pmullw_r2r(mm0, mm5);				\
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	  psrlw_i2r(8, mm5);				\
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	  paddw_r2r(mm5, mm6);				\
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	  pand_r2r(mm7, mm6);				\
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	  movq_r2r(mm1, mm5);				\
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	  por_r2r(mm4, mm5);				\
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	  pand_r2r(mm5, mm3);				\
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	  por_r2r(mm6, mm3);				\
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	  movq_r2m(mm3, *dstp);				\
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	  srcp += 4;					\
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	  dstp += 4;					\
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	  i -= 3;					\
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	}						\
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	emms();						\
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    } while(0)
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#define ALPHA_BLIT16_555MMX(to, from, length, bpp, alpha)	\
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    do {						\
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        int i, n = 0;					\
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	Uint16 *srcp = (Uint16 *)(from);		\
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	Uint16 *dstp = (Uint16 *)(to);			\
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        Uint32 ALPHA = 0x7C00;				\
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	movd_m2r(*(&ALPHA), mm1);			\
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        punpcklwd_r2r(mm1, mm1);			\
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        punpcklwd_r2r(mm1, mm1);			\
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	ALPHA = 0x03E0;					\
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        movd_m2r(*(&ALPHA), mm4);			\
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   308
        punpcklwd_r2r(mm4, mm4);			\
slouken@689
   309
        punpcklwd_r2r(mm4, mm4);			\
slouken@689
   310
	ALPHA = 0x001F;					\
slouken@689
   311
	movd_m2r(*(&ALPHA), mm7);			\
slouken@689
   312
        punpcklwd_r2r(mm7, mm7);			\
slouken@689
   313
        punpcklwd_r2r(mm7, mm7);			\
slouken@689
   314
	alpha &= ~(1+2+4);				\
slouken@689
   315
        i = (Uint32)alpha | (Uint32)alpha << 16;	\
slouken@689
   316
        movd_m2r(*(&i), mm0);				\
slouken@689
   317
        punpckldq_r2r(mm0, mm0);			\
slouken@689
   318
        i = ((int)(length) & 3);				\
slouken@689
   319
        ALPHA = alpha >> 3;				\
slouken@689
   320
	for(; i > 0; --i) {				\
slouken@689
   321
	    Uint32 s = *srcp++;				\
slouken@689
   322
	    Uint32 d = *dstp;				\
slouken@689
   323
	    s = (s | s << 16) & 0x03e07c1f;		\
slouken@689
   324
	    d = (d | d << 16) & 0x03e07c1f;		\
slouken@689
   325
	    d += (s - d) * ALPHA >> 5;			\
slouken@689
   326
	    d &= 0x03e07c1f;				\
slouken@689
   327
	    *dstp++ = d | d >> 16;			\
slouken@689
   328
	    n++;					\
slouken@689
   329
	}						\
slouken@689
   330
	i = (int)(length) - n;				\
slouken@689
   331
	for(; i > 0; --i) {				\
slouken@689
   332
	  movq_m2r((*dstp), mm3);			\
slouken@689
   333
	  movq_m2r((*srcp), mm2);			\
slouken@689
   334
	  movq_r2r(mm2, mm5);				\
slouken@689
   335
	  pand_r2r(mm1 , mm5);				\
slouken@689
   336
	  psrlq_i2r(10, mm5);				\
slouken@689
   337
	  movq_r2r(mm3, mm6);				\
slouken@689
   338
	  pand_r2r(mm1 , mm6);				\
slouken@689
   339
	  psrlq_i2r(10, mm6);				\
slouken@689
   340
	  psubw_r2r(mm6, mm5);				\
slouken@689
   341
	  pmullw_r2r(mm0, mm5);				\
slouken@689
   342
	  psrlw_i2r(8, mm5);				\
slouken@689
   343
	  paddw_r2r(mm5, mm6);				\
slouken@689
   344
	  psllq_i2r(10, mm6);				\
slouken@689
   345
	  pand_r2r(mm1, mm6);				\
slouken@689
   346
	  movq_r2r(mm4, mm5);				\
slouken@689
   347
	  por_r2r(mm7, mm5);				\
slouken@689
   348
	  pand_r2r(mm5, mm3);				\
slouken@689
   349
	  por_r2r(mm6, mm3);				\
slouken@689
   350
	  movq_r2r(mm2, mm5);				\
slouken@689
   351
	  pand_r2r(mm4 , mm5);				\
slouken@689
   352
	  psrlq_i2r(5, mm5);				\
slouken@689
   353
	  movq_r2r(mm3, mm6);				\
slouken@689
   354
	  pand_r2r(mm4 , mm6);				\
slouken@689
   355
	  psrlq_i2r(5, mm6);				\
slouken@689
   356
	  psubw_r2r(mm6, mm5);				\
slouken@689
   357
	  pmullw_r2r(mm0, mm5);				\
slouken@689
   358
	  psrlw_i2r(8, mm5);				\
slouken@689
   359
	  paddw_r2r(mm5, mm6);				\
slouken@689
   360
	  psllq_i2r(5, mm6);				\
slouken@689
   361
	  pand_r2r(mm4, mm6);				\
slouken@689
   362
	  movq_r2r(mm1, mm5);				\
slouken@689
   363
	  por_r2r(mm7, mm5);				\
slouken@689
   364
	  pand_r2r(mm5, mm3);				\
slouken@689
   365
	  por_r2r(mm6, mm3);				\
slouken@689
   366
	  movq_r2r(mm2, mm5);				\
slouken@689
   367
	  pand_r2r(mm7 , mm5);				\
slouken@689
   368
          movq_r2r(mm3, mm6);				\
slouken@689
   369
	  pand_r2r(mm7 , mm6);				\
slouken@689
   370
	  psubw_r2r(mm6, mm5);				\
slouken@689
   371
	  pmullw_r2r(mm0, mm5);				\
slouken@689
   372
	  psrlw_i2r(8, mm5);				\
slouken@689
   373
	  paddw_r2r(mm5, mm6);				\
slouken@689
   374
	  pand_r2r(mm7, mm6);				\
slouken@689
   375
	  movq_r2r(mm1, mm5);				\
slouken@689
   376
	  por_r2r(mm4, mm5);				\
slouken@689
   377
	  pand_r2r(mm5, mm3);				\
slouken@689
   378
	  por_r2r(mm6, mm3);				\
slouken@689
   379
	  movq_r2m(mm3, *dstp);				\
slouken@689
   380
	  srcp += 4;					\
slouken@689
   381
	  dstp += 4;					\
slouken@689
   382
	  i -= 3;					\
slouken@689
   383
	}						\
slouken@689
   384
	emms();						\
slouken@689
   385
    } while(0)
slouken@689
   386
slouken@689
   387
#endif
slouken@689
   388
slouken@0
   389
/*
slouken@0
   390
 * For 32bpp pixels on the form 0x00rrggbb:
slouken@0
   391
 * If we treat the middle component separately, we can process the two
slouken@0
   392
 * remaining in parallel. This is safe to do because of the gap to the left
slouken@0
   393
 * of each component, so the bits from the multiplication don't collide.
slouken@0
   394
 * This can be used for any RGB permutation of course.
slouken@0
   395
 */
slouken@0
   396
#define ALPHA_BLIT32_888(to, from, length, bpp, alpha)		\
slouken@0
   397
    do {							\
slouken@0
   398
        int i;							\
slouken@0
   399
	Uint32 *src = (Uint32 *)(from);				\
slouken@0
   400
	Uint32 *dst = (Uint32 *)(to);				\
slouken@0
   401
	for(i = 0; i < (int)(length); i++) {			\
slouken@0
   402
	    Uint32 s = *src++;					\
slouken@0
   403
	    Uint32 d = *dst;					\
slouken@0
   404
	    Uint32 s1 = s & 0xff00ff;				\
slouken@0
   405
	    Uint32 d1 = d & 0xff00ff;				\
slouken@0
   406
	    d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff;	\
slouken@0
   407
	    s &= 0xff00;					\
slouken@0
   408
	    d &= 0xff00;					\
slouken@0
   409
	    d = (d + ((s - d) * alpha >> 8)) & 0xff00;		\
slouken@0
   410
	    *dst++ = d1 | d;					\
slouken@0
   411
	}							\
slouken@0
   412
    } while(0)
slouken@0
   413
slouken@0
   414
/*
slouken@0
   415
 * For 16bpp pixels we can go a step further: put the middle component
slouken@0
   416
 * in the high 16 bits of a 32 bit word, and process all three RGB
slouken@0
   417
 * components at the same time. Since the smallest gap is here just
slouken@0
   418
 * 5 bits, we have to scale alpha down to 5 bits as well.
slouken@0
   419
 */
slouken@0
   420
#define ALPHA_BLIT16_565(to, from, length, bpp, alpha)	\
slouken@0
   421
    do {						\
slouken@0
   422
        int i;						\
slouken@0
   423
	Uint16 *src = (Uint16 *)(from);			\
slouken@0
   424
	Uint16 *dst = (Uint16 *)(to);			\
slouken@689
   425
	Uint32 ALPHA = alpha >> 3;			\
slouken@0
   426
	for(i = 0; i < (int)(length); i++) {		\
slouken@0
   427
	    Uint32 s = *src++;				\
slouken@0
   428
	    Uint32 d = *dst;				\
slouken@0
   429
	    s = (s | s << 16) & 0x07e0f81f;		\
slouken@0
   430
	    d = (d | d << 16) & 0x07e0f81f;		\
slouken@689
   431
	    d += (s - d) * ALPHA >> 5;			\
slouken@0
   432
	    d &= 0x07e0f81f;				\
slouken@0
   433
	    *dst++ = d | d >> 16;			\
slouken@0
   434
	}						\
slouken@0
   435
    } while(0)
slouken@0
   436
slouken@0
   437
#define ALPHA_BLIT16_555(to, from, length, bpp, alpha)	\
slouken@0
   438
    do {						\
slouken@0
   439
        int i;						\
slouken@0
   440
	Uint16 *src = (Uint16 *)(from);			\
slouken@0
   441
	Uint16 *dst = (Uint16 *)(to);			\
slouken@689
   442
	Uint32 ALPHA = alpha >> 3;			\
slouken@0
   443
	for(i = 0; i < (int)(length); i++) {		\
slouken@0
   444
	    Uint32 s = *src++;				\
slouken@0
   445
	    Uint32 d = *dst;				\
slouken@0
   446
	    s = (s | s << 16) & 0x03e07c1f;		\
slouken@0
   447
	    d = (d | d << 16) & 0x03e07c1f;		\
slouken@689
   448
	    d += (s - d) * ALPHA >> 5;			\
slouken@0
   449
	    d &= 0x03e07c1f;				\
slouken@0
   450
	    *dst++ = d | d >> 16;			\
slouken@0
   451
	}						\
slouken@0
   452
    } while(0)
slouken@0
   453
slouken@0
   454
/*
slouken@0
   455
 * The general slow catch-all function, for remaining depths and formats
slouken@0
   456
 */
slouken@0
   457
#define ALPHA_BLIT_ANY(to, from, length, bpp, alpha)			\
slouken@0
   458
    do {								\
slouken@0
   459
        int i;								\
slouken@0
   460
	Uint8 *src = from;						\
slouken@0
   461
	Uint8 *dst = to;						\
slouken@0
   462
	for(i = 0; i < (int)(length); i++) {				\
slouken@0
   463
	    Uint32 s, d;						\
slouken@0
   464
	    unsigned rs, gs, bs, rd, gd, bd;				\
slouken@0
   465
	    switch(bpp) {						\
slouken@0
   466
	    case 2:							\
slouken@0
   467
		s = *(Uint16 *)src;					\
slouken@0
   468
		d = *(Uint16 *)dst;					\
slouken@0
   469
		break;							\
slouken@0
   470
	    case 3:							\
slouken@0
   471
		if(SDL_BYTEORDER == SDL_BIG_ENDIAN) {			\
slouken@0
   472
		    s = (src[0] << 16) | (src[1] << 8) | src[2];	\
slouken@0
   473
		    d = (dst[0] << 16) | (dst[1] << 8) | dst[2];	\
slouken@0
   474
		} else {						\
slouken@0
   475
		    s = (src[2] << 16) | (src[1] << 8) | src[0];	\
slouken@0
   476
		    d = (dst[2] << 16) | (dst[1] << 8) | dst[0];	\
slouken@0
   477
		}							\
slouken@0
   478
		break;							\
slouken@0
   479
	    case 4:							\
slouken@0
   480
		s = *(Uint32 *)src;					\
slouken@0
   481
		d = *(Uint32 *)dst;					\
slouken@0
   482
		break;							\
slouken@0
   483
	    }								\
slouken@0
   484
	    RGB_FROM_PIXEL(s, fmt, rs, gs, bs);				\
slouken@0
   485
	    RGB_FROM_PIXEL(d, fmt, rd, gd, bd);				\
slouken@0
   486
	    rd += (rs - rd) * alpha >> 8;				\
slouken@0
   487
	    gd += (gs - gd) * alpha >> 8;				\
slouken@0
   488
	    bd += (bs - bd) * alpha >> 8;				\
slouken@0
   489
	    PIXEL_FROM_RGB(d, fmt, rd, gd, bd);				\
slouken@0
   490
	    switch(bpp) {						\
slouken@0
   491
	    case 2:							\
slouken@0
   492
		*(Uint16 *)dst = d;					\
slouken@0
   493
		break;							\
slouken@0
   494
	    case 3:							\
slouken@0
   495
		if(SDL_BYTEORDER == SDL_BIG_ENDIAN) {			\
slouken@0
   496
		    dst[0] = d >> 16;					\
slouken@0
   497
		    dst[1] = d >> 8;					\
slouken@0
   498
		    dst[2] = d;						\
slouken@0
   499
		} else {						\
slouken@0
   500
		    dst[0] = d;						\
slouken@0
   501
		    dst[1] = d >> 8;					\
slouken@0
   502
		    dst[2] = d >> 16;					\
slouken@0
   503
		}							\
slouken@0
   504
		break;							\
slouken@0
   505
	    case 4:							\
slouken@0
   506
		*(Uint32 *)dst = d;					\
slouken@0
   507
		break;							\
slouken@0
   508
	    }								\
slouken@0
   509
	    src += bpp;							\
slouken@0
   510
	    dst += bpp;							\
slouken@0
   511
	}								\
slouken@0
   512
    } while(0)
slouken@0
   513
slouken@689
   514
#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
slouken@0
   515
slouken@689
   516
#define ALPHA_BLIT32_888_50MMX(to, from, length, bpp, alpha)		\
slouken@689
   517
    do {								\
slouken@689
   518
	Uint32 *srcp = (Uint32 *)(from);				\
slouken@689
   519
	Uint32 *dstp = (Uint32 *)(to);					\
slouken@689
   520
        int i = 0x00fefefe;						\
slouken@689
   521
        movd_m2r(*(&i), mm4);						\
slouken@689
   522
        punpckldq_r2r(mm4, mm4);					\
slouken@689
   523
        i = 0x00010101;							\
slouken@689
   524
        movd_m2r(*(&i), mm3);						\
slouken@689
   525
        punpckldq_r2r(mm3, mm3);					\
slouken@689
   526
        i = (int)(length);						\
slouken@689
   527
        if( i & 1 ) {							\
slouken@689
   528
	  Uint32 s = *srcp++;						\
slouken@689
   529
	  Uint32 d = *dstp;						\
slouken@689
   530
	  *dstp++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1)	\
slouken@689
   531
		     + (s & d & 0x00010101);				\
slouken@689
   532
	  i--;								\
slouken@689
   533
	}								\
slouken@689
   534
	for(; i > 0; --i) {						\
slouken@689
   535
	    movq_m2r((*dstp), mm2); /* dst -> mm2 */			\
slouken@689
   536
	    movq_r2r(mm2, mm6);	/* dst -> mm6 */			\
slouken@689
   537
	    movq_m2r((*srcp), mm1); /* src -> mm1 */			\
slouken@689
   538
	    movq_r2r(mm1, mm5);	/* src -> mm5 */			\
slouken@689
   539
	    pand_r2r(mm4, mm6);	/* dst & 0x00fefefe -> mm6 */		\
slouken@689
   540
	    pand_r2r(mm4, mm5); /* src & 0x00fefefe -> mm5 */		\
slouken@689
   541
	    paddd_r2r(mm6, mm5); /* (dst & 0x00fefefe) + (dst & 0x00fefefe) -> mm5 */	\
slouken@689
   542
	    psrld_i2r(1, mm5);						\
slouken@689
   543
	    pand_r2r(mm1, mm2);	/* s & d -> mm2 */			\
slouken@689
   544
	    pand_r2r(mm3, mm2);	/* s & d & 0x00010101 -> mm2 */		\
slouken@689
   545
	    paddd_r2r(mm5, mm2);					\
slouken@689
   546
	    movq_r2m(mm2, (*dstp));					\
slouken@689
   547
	    dstp += 2;							\
slouken@689
   548
	    srcp += 2;							\
slouken@689
   549
	    i--;							\
slouken@689
   550
	}								\
slouken@689
   551
	emms();								\
slouken@689
   552
    } while(0)
slouken@689
   553
slouken@689
   554
#endif
slouken@689
   555
    
slouken@0
   556
/*
slouken@0
   557
 * Special case: 50% alpha (alpha=128)
slouken@0
   558
 * This is treated specially because it can be optimized very well, and
slouken@0
   559
 * since it is good for many cases of semi-translucency.
slouken@0
   560
 * The theory is to do all three components at the same time:
slouken@0
   561
 * First zero the lowest bit of each component, which gives us room to
slouken@0
   562
 * add them. Then shift right and add the sum of the lowest bits.
slouken@0
   563
 */
slouken@0
   564
#define ALPHA_BLIT32_888_50(to, from, length, bpp, alpha)		\
slouken@0
   565
    do {								\
slouken@0
   566
        int i;								\
slouken@0
   567
	Uint32 *src = (Uint32 *)(from);					\
slouken@0
   568
	Uint32 *dst = (Uint32 *)(to);					\
slouken@0
   569
	for(i = 0; i < (int)(length); i++) {				\
slouken@0
   570
	    Uint32 s = *src++;						\
slouken@0
   571
	    Uint32 d = *dst;						\
slouken@0
   572
	    *dst++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1)	\
slouken@0
   573
		     + (s & d & 0x00010101);				\
slouken@0
   574
	}								\
slouken@0
   575
    } while(0)
slouken@0
   576
slouken@0
   577
/*
slouken@0
   578
 * For 16bpp, we can actually blend two pixels in parallel, if we take
slouken@0
   579
 * care to shift before we add, not after.
slouken@0
   580
 */
slouken@0
   581
slouken@0
   582
/* helper: blend a single 16 bit pixel at 50% */
slouken@0
   583
#define BLEND16_50(dst, src, mask)			\
slouken@0
   584
    do {						\
slouken@0
   585
        Uint32 s = *src++;				\
slouken@0
   586
	Uint32 d = *dst;				\
slouken@0
   587
	*dst++ = (((s & mask) + (d & mask)) >> 1)	\
slouken@0
   588
	         + (s & d & (~mask & 0xffff));		\
slouken@0
   589
    } while(0)
slouken@0
   590
slouken@0
   591
/* basic 16bpp blender. mask is the pixels to keep when adding. */
slouken@0
   592
#define ALPHA_BLIT16_50(to, from, length, bpp, alpha, mask)		\
slouken@0
   593
    do {								\
slouken@0
   594
	unsigned n = (length);						\
slouken@0
   595
	Uint16 *src = (Uint16 *)(from);					\
slouken@0
   596
	Uint16 *dst = (Uint16 *)(to);					\
slouken@0
   597
	if(((unsigned long)src ^ (unsigned long)dst) & 3) {		\
slouken@0
   598
	    /* source and destination not in phase, blit one by one */	\
slouken@0
   599
	    while(n--)							\
slouken@0
   600
		BLEND16_50(dst, src, mask);				\
slouken@0
   601
	} else {							\
slouken@0
   602
	    if((unsigned long)src & 3) {				\
slouken@0
   603
		/* first odd pixel */					\
slouken@0
   604
		BLEND16_50(dst, src, mask);				\
slouken@0
   605
		n--;							\
slouken@0
   606
	    }								\
slouken@0
   607
	    for(; n > 1; n -= 2) {					\
slouken@0
   608
		Uint32 s = *(Uint32 *)src;				\
slouken@0
   609
		Uint32 d = *(Uint32 *)dst;				\
slouken@0
   610
		*(Uint32 *)dst = ((s & (mask | mask << 16)) >> 1)	\
slouken@0
   611
		               + ((d & (mask | mask << 16)) >> 1)	\
slouken@0
   612
		               + (s & d & (~(mask | mask << 16)));	\
slouken@0
   613
		src += 2;						\
slouken@0
   614
		dst += 2;						\
slouken@0
   615
	    }								\
slouken@0
   616
	    if(n)							\
slouken@0
   617
		BLEND16_50(dst, src, mask); /* last odd pixel */	\
slouken@0
   618
	}								\
slouken@0
   619
    } while(0)
slouken@0
   620
slouken@0
   621
#define ALPHA_BLIT16_565_50(to, from, length, bpp, alpha)	\
slouken@0
   622
    ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xf7de)
slouken@0
   623
slouken@0
   624
#define ALPHA_BLIT16_555_50(to, from, length, bpp, alpha)	\
slouken@0
   625
    ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xfbde)
slouken@0
   626
slouken@689
   627
#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
slouken@0
   628
slouken@0
   629
#define CHOOSE_BLIT(blitter, alpha, fmt)				\
slouken@0
   630
    do {								\
slouken@0
   631
        if(alpha == 255) {						\
slouken@0
   632
	    switch(fmt->BytesPerPixel) {				\
slouken@0
   633
	    case 1: blitter(1, Uint8, OPAQUE_BLIT); break;		\
slouken@0
   634
	    case 2: blitter(2, Uint8, OPAQUE_BLIT); break;		\
slouken@0
   635
	    case 3: blitter(3, Uint8, OPAQUE_BLIT); break;		\
slouken@0
   636
	    case 4: blitter(4, Uint16, OPAQUE_BLIT); break;		\
slouken@0
   637
	    }								\
slouken@0
   638
	} else {							\
slouken@0
   639
	    switch(fmt->BytesPerPixel) {				\
slouken@0
   640
	    case 1:							\
slouken@0
   641
		/* No 8bpp alpha blitting */				\
slouken@0
   642
		break;							\
slouken@0
   643
									\
slouken@0
   644
	    case 2:							\
slouken@0
   645
		switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) {		\
slouken@0
   646
		case 0xffff:						\
slouken@0
   647
		    if(fmt->Gmask == 0x07e0				\
slouken@0
   648
		       || fmt->Rmask == 0x07e0				\
slouken@0
   649
		       || fmt->Bmask == 0x07e0) {			\
slouken@0
   650
			if(alpha == 128)				\
slouken@0
   651
			    blitter(2, Uint8, ALPHA_BLIT16_565_50);	\
slouken@0
   652
			else {						\
slouken@739
   653
			    if(SDL_HasMMX())				\
slouken@689
   654
				blitter(2, Uint8, ALPHA_BLIT16_565MMX);	\
slouken@689
   655
			    else					\
slouken@689
   656
				blitter(2, Uint8, ALPHA_BLIT16_565);	\
slouken@689
   657
			}						\
slouken@689
   658
		    } else						\
slouken@689
   659
			goto general16;					\
slouken@689
   660
		    break;						\
slouken@689
   661
									\
slouken@689
   662
		case 0x7fff:						\
slouken@689
   663
		    if(fmt->Gmask == 0x03e0				\
slouken@689
   664
		       || fmt->Rmask == 0x03e0				\
slouken@689
   665
		       || fmt->Bmask == 0x03e0) {			\
slouken@689
   666
			if(alpha == 128)				\
slouken@689
   667
			    blitter(2, Uint8, ALPHA_BLIT16_555_50);	\
slouken@689
   668
			else {						\
slouken@739
   669
			    if(SDL_HasMMX())				\
slouken@689
   670
				blitter(2, Uint8, ALPHA_BLIT16_555MMX);	\
slouken@689
   671
			    else					\
slouken@689
   672
				blitter(2, Uint8, ALPHA_BLIT16_555);	\
slouken@689
   673
			}						\
slouken@689
   674
			break;						\
slouken@689
   675
		    }							\
slouken@689
   676
		    /* fallthrough */					\
slouken@689
   677
									\
slouken@689
   678
		default:						\
slouken@689
   679
		general16:						\
slouken@689
   680
		    blitter(2, Uint8, ALPHA_BLIT_ANY);			\
slouken@689
   681
		}							\
slouken@689
   682
		break;							\
slouken@689
   683
									\
slouken@689
   684
	    case 3:							\
slouken@689
   685
		blitter(3, Uint8, ALPHA_BLIT_ANY);			\
slouken@689
   686
		break;							\
slouken@689
   687
									\
slouken@689
   688
	    case 4:							\
slouken@689
   689
		if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff	\
slouken@689
   690
		   && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00	\
slouken@689
   691
		       || fmt->Bmask == 0xff00)) {			\
slouken@689
   692
		    if(alpha == 128)					\
slouken@689
   693
		    {							\
slouken@739
   694
			if(SDL_HasMMX())				\
slouken@689
   695
				blitter(4, Uint16, ALPHA_BLIT32_888_50MMX);\
slouken@689
   696
			else						\
slouken@689
   697
				blitter(4, Uint16, ALPHA_BLIT32_888_50);\
slouken@689
   698
		    }							\
slouken@689
   699
		    else						\
slouken@689
   700
		    {							\
slouken@739
   701
			if(SDL_HasMMX())				\
slouken@689
   702
				blitter(4, Uint16, ALPHA_BLIT32_888MMX);\
slouken@689
   703
			else						\
slouken@689
   704
				blitter(4, Uint16, ALPHA_BLIT32_888);	\
slouken@689
   705
		    }							\
slouken@689
   706
		} else							\
slouken@689
   707
		    blitter(4, Uint16, ALPHA_BLIT_ANY);			\
slouken@689
   708
		break;							\
slouken@689
   709
	    }								\
slouken@689
   710
	}								\
slouken@689
   711
    } while(0)
slouken@689
   712
slouken@689
   713
#else
slouken@689
   714
	
slouken@689
   715
#define CHOOSE_BLIT(blitter, alpha, fmt)				\
slouken@689
   716
    do {								\
slouken@689
   717
        if(alpha == 255) {						\
slouken@689
   718
	    switch(fmt->BytesPerPixel) {				\
slouken@689
   719
	    case 1: blitter(1, Uint8, OPAQUE_BLIT); break;		\
slouken@689
   720
	    case 2: blitter(2, Uint8, OPAQUE_BLIT); break;		\
slouken@689
   721
	    case 3: blitter(3, Uint8, OPAQUE_BLIT); break;		\
slouken@689
   722
	    case 4: blitter(4, Uint16, OPAQUE_BLIT); break;		\
slouken@689
   723
	    }								\
slouken@689
   724
	} else {							\
slouken@689
   725
	    switch(fmt->BytesPerPixel) {				\
slouken@689
   726
	    case 1:							\
slouken@689
   727
		/* No 8bpp alpha blitting */				\
slouken@689
   728
		break;							\
slouken@689
   729
									\
slouken@689
   730
	    case 2:							\
slouken@689
   731
		switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) {		\
slouken@689
   732
		case 0xffff:						\
slouken@689
   733
		    if(fmt->Gmask == 0x07e0				\
slouken@689
   734
		       || fmt->Rmask == 0x07e0				\
slouken@689
   735
		       || fmt->Bmask == 0x07e0) {			\
slouken@689
   736
			if(alpha == 128)				\
slouken@689
   737
			    blitter(2, Uint8, ALPHA_BLIT16_565_50);	\
slouken@689
   738
			else {						\
slouken@0
   739
			    blitter(2, Uint8, ALPHA_BLIT16_565);	\
slouken@0
   740
			}						\
slouken@0
   741
		    } else						\
slouken@0
   742
			goto general16;					\
slouken@0
   743
		    break;						\
slouken@0
   744
									\
slouken@0
   745
		case 0x7fff:						\
slouken@0
   746
		    if(fmt->Gmask == 0x03e0				\
slouken@0
   747
		       || fmt->Rmask == 0x03e0				\
slouken@0
   748
		       || fmt->Bmask == 0x03e0) {			\
slouken@0
   749
			if(alpha == 128)				\
slouken@0
   750
			    blitter(2, Uint8, ALPHA_BLIT16_555_50);	\
slouken@0
   751
			else {						\
slouken@0
   752
			    blitter(2, Uint8, ALPHA_BLIT16_555);	\
slouken@0
   753
			}						\
slouken@0
   754
			break;						\
slouken@0
   755
		    }							\
slouken@0
   756
		    /* fallthrough */					\
slouken@0
   757
									\
slouken@0
   758
		default:						\
slouken@0
   759
		general16:						\
slouken@0
   760
		    blitter(2, Uint8, ALPHA_BLIT_ANY);			\
slouken@0
   761
		}							\
slouken@0
   762
		break;							\
slouken@0
   763
									\
slouken@0
   764
	    case 3:							\
slouken@0
   765
		blitter(3, Uint8, ALPHA_BLIT_ANY);			\
slouken@0
   766
		break;							\
slouken@0
   767
									\
slouken@0
   768
	    case 4:							\
slouken@0
   769
		if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff	\
slouken@0
   770
		   && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00	\
slouken@0
   771
		       || fmt->Bmask == 0xff00)) {			\
slouken@0
   772
		    if(alpha == 128)					\
slouken@0
   773
			blitter(4, Uint16, ALPHA_BLIT32_888_50);	\
slouken@0
   774
		    else						\
slouken@0
   775
			blitter(4, Uint16, ALPHA_BLIT32_888);		\
slouken@0
   776
		} else							\
slouken@0
   777
		    blitter(4, Uint16, ALPHA_BLIT_ANY);			\
slouken@0
   778
		break;							\
slouken@0
   779
	    }								\
slouken@0
   780
	}								\
slouken@0
   781
    } while(0)
slouken@0
   782
slouken@689
   783
#endif
slouken@0
   784
slouken@0
   785
/*
slouken@0
   786
 * This takes care of the case when the surface is clipped on the left and/or
slouken@0
   787
 * right. Top clipping has already been taken care of.
slouken@0
   788
 */
slouken@0
   789
static void RLEClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst,
slouken@0
   790
			Uint8 *dstbuf, SDL_Rect *srcrect, unsigned alpha)
slouken@0
   791
{
slouken@0
   792
    SDL_PixelFormat *fmt = dst->format;
slouken@0
   793
slouken@0
   794
#define RLECLIPBLIT(bpp, Type, do_blit)					   \
slouken@0
   795
    do {								   \
slouken@0
   796
	int linecount = srcrect->h;					   \
slouken@0
   797
	int ofs = 0;							   \
slouken@0
   798
	int left = srcrect->x;						   \
slouken@0
   799
	int right = left + srcrect->w;					   \
slouken@0
   800
	dstbuf -= left * bpp;						   \
slouken@0
   801
	for(;;) {							   \
slouken@0
   802
	    int run;							   \
slouken@0
   803
	    ofs += *(Type *)srcbuf;					   \
slouken@0
   804
	    run = ((Type *)srcbuf)[1];					   \
slouken@0
   805
	    srcbuf += 2 * sizeof(Type);					   \
slouken@0
   806
	    if(run) {							   \
slouken@0
   807
		/* clip to left and right borders */			   \
slouken@0
   808
		if(ofs < right) {					   \
slouken@0
   809
		    int start = 0;					   \
slouken@0
   810
		    int len = run;					   \
slouken@0
   811
		    int startcol;					   \
slouken@0
   812
		    if(left - ofs > 0) {				   \
slouken@0
   813
			start = left - ofs;				   \
slouken@0
   814
			len -= start;					   \
slouken@0
   815
			if(len <= 0)					   \
slouken@0
   816
			    goto nocopy ## bpp ## do_blit;		   \
slouken@0
   817
		    }							   \
slouken@0
   818
		    startcol = ofs + start;				   \
slouken@0
   819
		    if(len > right - startcol)				   \
slouken@0
   820
			len = right - startcol;				   \
slouken@0
   821
		    do_blit(dstbuf + startcol * bpp, srcbuf + start * bpp, \
slouken@0
   822
			    len, bpp, alpha);				   \
slouken@0
   823
		}							   \
slouken@0
   824
	    nocopy ## bpp ## do_blit:					   \
slouken@0
   825
		srcbuf += run * bpp;					   \
slouken@0
   826
		ofs += run;						   \
slouken@0
   827
	    } else if(!ofs)						   \
slouken@0
   828
		break;							   \
slouken@0
   829
	    if(ofs == w) {						   \
slouken@0
   830
		ofs = 0;						   \
slouken@0
   831
		dstbuf += dst->pitch;					   \
slouken@0
   832
		if(!--linecount)					   \
slouken@0
   833
		    break;						   \
slouken@0
   834
	    }								   \
slouken@0
   835
	}								   \
slouken@0
   836
    } while(0)
slouken@0
   837
slouken@0
   838
    CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt);
slouken@0
   839
slouken@0
   840
#undef RLECLIPBLIT
slouken@0
   841
slouken@0
   842
}
slouken@0
   843
slouken@0
   844
slouken@0
   845
/* blit a colorkeyed RLE surface */
slouken@0
   846
int SDL_RLEBlit(SDL_Surface *src, SDL_Rect *srcrect,
slouken@0
   847
		SDL_Surface *dst, SDL_Rect *dstrect)
slouken@0
   848
{
slouken@0
   849
	Uint8 *dstbuf;
slouken@0
   850
	Uint8 *srcbuf;
slouken@0
   851
	int x, y;
slouken@0
   852
	int w = src->w;
slouken@0
   853
	unsigned alpha;
slouken@0
   854
slouken@0
   855
	/* Lock the destination if necessary */
slouken@526
   856
	if ( SDL_MUSTLOCK(dst) ) {
slouken@526
   857
		if ( SDL_LockSurface(dst) < 0 ) {
slouken@0
   858
			return(-1);
slouken@0
   859
		}
slouken@0
   860
	}
slouken@0
   861
slouken@0
   862
	/* Set up the source and destination pointers */
slouken@0
   863
	x = dstrect->x;
slouken@0
   864
	y = dstrect->y;
slouken@526
   865
	dstbuf = (Uint8 *)dst->pixels
slouken@0
   866
	         + y * dst->pitch + x * src->format->BytesPerPixel;
slouken@0
   867
	srcbuf = (Uint8 *)src->map->sw_data->aux_data;
slouken@0
   868
slouken@0
   869
	{
slouken@0
   870
	    /* skip lines at the top if neccessary */
slouken@0
   871
	    int vskip = srcrect->y;
slouken@0
   872
	    int ofs = 0;
slouken@0
   873
	    if(vskip) {
slouken@0
   874
slouken@0
   875
#define RLESKIP(bpp, Type)			\
slouken@0
   876
		for(;;) {			\
slouken@0
   877
		    int run;			\
slouken@0
   878
		    ofs += *(Type *)srcbuf;	\
slouken@0
   879
		    run = ((Type *)srcbuf)[1];	\
slouken@0
   880
		    srcbuf += sizeof(Type) * 2;	\
slouken@0
   881
		    if(run) {			\
slouken@0
   882
			srcbuf += run * bpp;	\
slouken@0
   883
			ofs += run;		\
slouken@0
   884
		    } else if(!ofs)		\
slouken@0
   885
			goto done;		\
slouken@0
   886
		    if(ofs == w) {		\
slouken@0
   887
			ofs = 0;		\
slouken@0
   888
			if(!--vskip)		\
slouken@0
   889
			    break;		\
slouken@0
   890
		    }				\
slouken@0
   891
		}
slouken@0
   892
slouken@0
   893
		switch(src->format->BytesPerPixel) {
slouken@0
   894
		case 1: RLESKIP(1, Uint8); break;
slouken@0
   895
		case 2: RLESKIP(2, Uint8); break;
slouken@0
   896
		case 3: RLESKIP(3, Uint8); break;
slouken@0
   897
		case 4: RLESKIP(4, Uint16); break;
slouken@0
   898
		}
slouken@0
   899
slouken@0
   900
#undef RLESKIP
slouken@0
   901
slouken@0
   902
	    }
slouken@0
   903
	}
slouken@0
   904
slouken@0
   905
	alpha = (src->flags & SDL_SRCALPHA) == SDL_SRCALPHA
slouken@0
   906
	        ? src->format->alpha : 255;
slouken@0
   907
	/* if left or right edge clipping needed, call clip blit */
slouken@0
   908
	if ( srcrect->x || srcrect->w != src->w ) {
slouken@0
   909
	    RLEClipBlit(w, srcbuf, dst, dstbuf, srcrect, alpha);
slouken@0
   910
	} else {
slouken@0
   911
	    SDL_PixelFormat *fmt = src->format;
slouken@0
   912
slouken@0
   913
#define RLEBLIT(bpp, Type, do_blit)					      \
slouken@0
   914
	    do {							      \
slouken@0
   915
		int linecount = srcrect->h;				      \
slouken@0
   916
		int ofs = 0;						      \
slouken@0
   917
		for(;;) {						      \
slouken@0
   918
		    unsigned run;					      \
slouken@0
   919
		    ofs += *(Type *)srcbuf;				      \
slouken@0
   920
		    run = ((Type *)srcbuf)[1];				      \
slouken@0
   921
		    srcbuf += 2 * sizeof(Type);				      \
slouken@0
   922
		    if(run) {						      \
slouken@0
   923
			do_blit(dstbuf + ofs * bpp, srcbuf, run, bpp, alpha); \
slouken@0
   924
			srcbuf += run * bpp;				      \
slouken@0
   925
			ofs += run;					      \
slouken@0
   926
		    } else if(!ofs)					      \
slouken@0
   927
			break;						      \
slouken@0
   928
		    if(ofs == w) {					      \
slouken@0
   929
			ofs = 0;					      \
slouken@0
   930
			dstbuf += dst->pitch;				      \
slouken@0
   931
			if(!--linecount)				      \
slouken@0
   932
			    break;					      \
slouken@0
   933
		    }							      \
slouken@0
   934
		}							      \
slouken@0
   935
	    } while(0)
slouken@0
   936
slouken@0
   937
	    CHOOSE_BLIT(RLEBLIT, alpha, fmt);
slouken@0
   938
slouken@0
   939
#undef RLEBLIT
slouken@0
   940
	}
slouken@0
   941
slouken@0
   942
done:
slouken@0
   943
	/* Unlock the destination if necessary */
slouken@526
   944
	if ( SDL_MUSTLOCK(dst) ) {
slouken@526
   945
		SDL_UnlockSurface(dst);
slouken@0
   946
	}
slouken@0
   947
	return(0);
slouken@0
   948
}
slouken@0
   949
slouken@0
   950
#undef OPAQUE_BLIT
slouken@0
   951
slouken@0
   952
/*
slouken@0
   953
 * Per-pixel blitting macros for translucent pixels:
slouken@0
   954
 * These use the same techniques as the per-surface blitting macros
slouken@0
   955
 */
slouken@0
   956
slouken@0
   957
/*
slouken@0
   958
 * For 32bpp pixels, we have made sure the alpha is stored in the top
slouken@0
   959
 * 8 bits, so proceed as usual
slouken@0
   960
 */
slouken@0
   961
#define BLIT_TRANSL_888(src, dst)				\
slouken@0
   962
    do {							\
slouken@0
   963
        Uint32 s = src;						\
slouken@0
   964
	Uint32 d = dst;						\
slouken@0
   965
	unsigned alpha = s >> 24;				\
slouken@0
   966
	Uint32 s1 = s & 0xff00ff;				\
slouken@0
   967
	Uint32 d1 = d & 0xff00ff;				\
slouken@0
   968
	d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff;	\
slouken@0
   969
	s &= 0xff00;						\
slouken@0
   970
	d &= 0xff00;						\
slouken@0
   971
	d = (d + ((s - d) * alpha >> 8)) & 0xff00;		\
slouken@0
   972
	dst = d1 | d;						\
slouken@0
   973
    } while(0)
slouken@0
   974
slouken@0
   975
/*
slouken@0
   976
 * For 16bpp pixels, we have stored the 5 most significant alpha bits in
slouken@0
   977
 * bits 5-10. As before, we can process all 3 RGB components at the same time.
slouken@0
   978
 */
slouken@0
   979
#define BLIT_TRANSL_565(src, dst)		\
slouken@0
   980
    do {					\
slouken@0
   981
        Uint32 s = src;				\
slouken@0
   982
	Uint32 d = dst;				\
slouken@0
   983
	unsigned alpha = (s & 0x3e0) >> 5;	\
slouken@0
   984
	s &= 0x07e0f81f;			\
slouken@0
   985
	d = (d | d << 16) & 0x07e0f81f;		\
slouken@0
   986
	d += (s - d) * alpha >> 5;		\
slouken@0
   987
	d &= 0x07e0f81f;			\
slouken@0
   988
	dst = d | d >> 16;			\
slouken@0
   989
    } while(0)
slouken@0
   990
slouken@0
   991
#define BLIT_TRANSL_555(src, dst)		\
slouken@0
   992
    do {					\
slouken@0
   993
        Uint32 s = src;				\
slouken@0
   994
	Uint32 d = dst;				\
slouken@0
   995
	unsigned alpha = (s & 0x3e0) >> 5;	\
slouken@0
   996
	s &= 0x03e07c1f;			\
slouken@0
   997
	d = (d | d << 16) & 0x03e07c1f;		\
slouken@0
   998
	d += (s - d) * alpha >> 5;		\
slouken@0
   999
	d &= 0x03e07c1f;			\
slouken@0
  1000
	dst = d | d >> 16;			\
slouken@0
  1001
    } while(0)
slouken@0
  1002
slouken@0
  1003
/* used to save the destination format in the encoding. Designed to be
slouken@0
  1004
   macro-compatible with SDL_PixelFormat but without the unneeded fields */
slouken@0
  1005
typedef struct {
slouken@0
  1006
    	Uint8  BytesPerPixel;
slouken@0
  1007
	Uint8  Rloss;
slouken@0
  1008
	Uint8  Gloss;
slouken@0
  1009
	Uint8  Bloss;
slouken@0
  1010
	Uint8  Rshift;
slouken@0
  1011
	Uint8  Gshift;
slouken@0
  1012
	Uint8  Bshift;
slouken@0
  1013
	Uint8  Ashift;
slouken@0
  1014
	Uint32 Rmask;
slouken@0
  1015
	Uint32 Gmask;
slouken@0
  1016
	Uint32 Bmask;
slouken@0
  1017
	Uint32 Amask;
slouken@0
  1018
} RLEDestFormat;
slouken@0
  1019
slouken@0
  1020
/* blit a pixel-alpha RLE surface clipped at the right and/or left edges */
slouken@0
  1021
static void RLEAlphaClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst,
slouken@0
  1022
			     Uint8 *dstbuf, SDL_Rect *srcrect)
slouken@0
  1023
{
slouken@0
  1024
    SDL_PixelFormat *df = dst->format;
slouken@0
  1025
    /*
slouken@0
  1026
     * clipped blitter: Ptype is the destination pixel type,
slouken@0
  1027
     * Ctype the translucent count type, and do_blend the macro
slouken@0
  1028
     * to blend one pixel.
slouken@0
  1029
     */
slouken@0
  1030
#define RLEALPHACLIPBLIT(Ptype, Ctype, do_blend)			  \
slouken@0
  1031
    do {								  \
slouken@0
  1032
	int linecount = srcrect->h;					  \
slouken@0
  1033
	int left = srcrect->x;						  \
slouken@0
  1034
	int right = left + srcrect->w;					  \
slouken@0
  1035
	dstbuf -= left * sizeof(Ptype);					  \
slouken@0
  1036
	do {								  \
slouken@0
  1037
	    int ofs = 0;						  \
slouken@0
  1038
	    /* blit opaque pixels on one line */			  \
slouken@0
  1039
	    do {							  \
slouken@0
  1040
		unsigned run;						  \
slouken@0
  1041
		ofs += ((Ctype *)srcbuf)[0];				  \
slouken@0
  1042
		run = ((Ctype *)srcbuf)[1];				  \
slouken@0
  1043
		srcbuf += 2 * sizeof(Ctype);				  \
slouken@0
  1044
		if(run) {						  \
slouken@0
  1045
		    /* clip to left and right borders */		  \
slouken@0
  1046
		    int cofs = ofs;					  \
slouken@0
  1047
		    int crun = run;					  \
slouken@0
  1048
		    if(left - cofs > 0) {				  \
slouken@0
  1049
			crun -= left - cofs;				  \
slouken@0
  1050
			cofs = left;					  \
slouken@0
  1051
		    }							  \
slouken@0
  1052
		    if(crun > right - cofs)				  \
slouken@0
  1053
			crun = right - cofs;				  \
slouken@0
  1054
		    if(crun > 0)					  \
slouken@1
  1055
			PIXEL_COPY(dstbuf + cofs * sizeof(Ptype),	  \
slouken@0
  1056
				   srcbuf + (cofs - ofs) * sizeof(Ptype), \
slouken@1
  1057
				   (unsigned)crun, sizeof(Ptype));	  \
slouken@0
  1058
		    srcbuf += run * sizeof(Ptype);			  \
slouken@0
  1059
		    ofs += run;						  \
slouken@0
  1060
		} else if(!ofs)						  \
slouken@0
  1061
		    return;						  \
slouken@0
  1062
	    } while(ofs < w);						  \
slouken@0
  1063
	    /* skip padding if necessary */				  \
slouken@0
  1064
	    if(sizeof(Ptype) == 2)					  \
slouken@0
  1065
		srcbuf += (unsigned long)srcbuf & 2;			  \
slouken@0
  1066
	    /* blit translucent pixels on the same line */		  \
slouken@0
  1067
	    ofs = 0;							  \
slouken@0
  1068
	    do {							  \
slouken@0
  1069
		unsigned run;						  \
slouken@0
  1070
		ofs += ((Uint16 *)srcbuf)[0];				  \
slouken@0
  1071
		run = ((Uint16 *)srcbuf)[1];				  \
slouken@0
  1072
		srcbuf += 4;						  \
slouken@0
  1073
		if(run) {						  \
slouken@0
  1074
		    /* clip to left and right borders */		  \
slouken@0
  1075
		    int cofs = ofs;					  \
slouken@0
  1076
		    int crun = run;					  \
slouken@0
  1077
		    if(left - cofs > 0) {				  \
slouken@0
  1078
			crun -= left - cofs;				  \
slouken@0
  1079
			cofs = left;					  \
slouken@0
  1080
		    }							  \
slouken@0
  1081
		    if(crun > right - cofs)				  \
slouken@0
  1082
			crun = right - cofs;				  \
slouken@0
  1083
		    if(crun > 0) {					  \
slouken@0
  1084
			Ptype *dst = (Ptype *)dstbuf + cofs;		  \
slouken@0
  1085
			Uint32 *src = (Uint32 *)srcbuf + (cofs - ofs);	  \
slouken@0
  1086
			int i;						  \
slouken@0
  1087
			for(i = 0; i < crun; i++)			  \
slouken@0
  1088
			    do_blend(src[i], dst[i]);			  \
slouken@0
  1089
		    }							  \
slouken@0
  1090
		    srcbuf += run * 4;					  \
slouken@0
  1091
		    ofs += run;						  \
slouken@0
  1092
		}							  \
slouken@0
  1093
	    } while(ofs < w);						  \
slouken@0
  1094
	    dstbuf += dst->pitch;					  \
slouken@0
  1095
	} while(--linecount);						  \
slouken@0
  1096
    } while(0)
slouken@0
  1097
slouken@0
  1098
    switch(df->BytesPerPixel) {
slouken@0
  1099
    case 2:
slouken@0
  1100
	if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0
slouken@0
  1101
	   || df->Bmask == 0x07e0)
slouken@0
  1102
	    RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_565);
slouken@0
  1103
	else
slouken@0
  1104
	    RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_555);
slouken@0
  1105
	break;
slouken@0
  1106
    case 4:
slouken@0
  1107
	RLEALPHACLIPBLIT(Uint32, Uint16, BLIT_TRANSL_888);
slouken@0
  1108
	break;
slouken@0
  1109
    }
slouken@0
  1110
}
slouken@0
  1111
slouken@0
  1112
/* blit a pixel-alpha RLE surface */
slouken@0
  1113
int SDL_RLEAlphaBlit(SDL_Surface *src, SDL_Rect *srcrect,
slouken@0
  1114
		     SDL_Surface *dst, SDL_Rect *dstrect)
slouken@0
  1115
{
slouken@0
  1116
    int x, y;
slouken@0
  1117
    int w = src->w;
slouken@0
  1118
    Uint8 *srcbuf, *dstbuf;
slouken@0
  1119
    SDL_PixelFormat *df = dst->format;
slouken@0
  1120
slouken@0
  1121
    /* Lock the destination if necessary */
slouken@526
  1122
    if ( SDL_MUSTLOCK(dst) ) {
slouken@526
  1123
	if ( SDL_LockSurface(dst) < 0 ) {
slouken@0
  1124
	    return -1;
slouken@0
  1125
	}
slouken@0
  1126
    }
slouken@0
  1127
slouken@0
  1128
    x = dstrect->x;
slouken@0
  1129
    y = dstrect->y;
slouken@526
  1130
    dstbuf = (Uint8 *)dst->pixels
slouken@0
  1131
	     + y * dst->pitch + x * df->BytesPerPixel;
slouken@0
  1132
    srcbuf = (Uint8 *)src->map->sw_data->aux_data + sizeof(RLEDestFormat);
slouken@0
  1133
slouken@0
  1134
    {
slouken@0
  1135
	/* skip lines at the top if necessary */
slouken@0
  1136
	int vskip = srcrect->y;
slouken@0
  1137
	if(vskip) {
slouken@0
  1138
	    int ofs;
slouken@0
  1139
	    if(df->BytesPerPixel == 2) {
slouken@0
  1140
		/* the 16/32 interleaved format */
slouken@0
  1141
		do {
slouken@0
  1142
		    /* skip opaque line */
slouken@0
  1143
		    ofs = 0;
slouken@0
  1144
		    do {
slouken@0
  1145
			int run;
slouken@0
  1146
			ofs += srcbuf[0];
slouken@0
  1147
			run = srcbuf[1];
slouken@0
  1148
			srcbuf += 2;
slouken@0
  1149
			if(run) {
slouken@0
  1150
			    srcbuf += 2 * run;
slouken@0
  1151
			    ofs += run;
slouken@0
  1152
			} else if(!ofs)
slouken@0
  1153
			    goto done;
slouken@0
  1154
		    } while(ofs < w);
slouken@0
  1155
slouken@0
  1156
		    /* skip padding */
slouken@0
  1157
		    srcbuf += (unsigned long)srcbuf & 2;
slouken@0
  1158
slouken@0
  1159
		    /* skip translucent line */
slouken@0
  1160
		    ofs = 0;
slouken@0
  1161
		    do {
slouken@0
  1162
			int run;
slouken@0
  1163
			ofs += ((Uint16 *)srcbuf)[0];
slouken@0
  1164
			run = ((Uint16 *)srcbuf)[1];
slouken@0
  1165
			srcbuf += 4 * (run + 1);
slouken@0
  1166
			ofs += run;
slouken@0
  1167
		    } while(ofs < w);
slouken@0
  1168
		} while(--vskip);
slouken@0
  1169
	    } else {
slouken@0
  1170
		/* the 32/32 interleaved format */
slouken@0
  1171
		vskip <<= 1;	/* opaque and translucent have same format */
slouken@0
  1172
		do {
slouken@0
  1173
		    ofs = 0;
slouken@0
  1174
		    do {
slouken@0
  1175
			int run;
slouken@0
  1176
			ofs += ((Uint16 *)srcbuf)[0];
slouken@0
  1177
			run = ((Uint16 *)srcbuf)[1];
slouken@0
  1178
			srcbuf += 4;
slouken@0
  1179
			if(run) {
slouken@0
  1180
			    srcbuf += 4 * run;
slouken@0
  1181
			    ofs += run;
slouken@0
  1182
			} else if(!ofs)
slouken@0
  1183
			    goto done;
slouken@0
  1184
		    } while(ofs < w);
slouken@0
  1185
		} while(--vskip);
slouken@0
  1186
	    }
slouken@0
  1187
	}
slouken@0
  1188
    }
slouken@0
  1189
slouken@0
  1190
    /* if left or right edge clipping needed, call clip blit */
slouken@0
  1191
    if(srcrect->x || srcrect->w != src->w) {
slouken@0
  1192
	RLEAlphaClipBlit(w, srcbuf, dst, dstbuf, srcrect);
slouken@0
  1193
    } else {
slouken@0
  1194
slouken@0
  1195
	/*
slouken@0
  1196
	 * non-clipped blitter. Ptype is the destination pixel type,
slouken@0
  1197
	 * Ctype the translucent count type, and do_blend the
slouken@0
  1198
	 * macro to blend one pixel.
slouken@0
  1199
	 */
slouken@0
  1200
#define RLEALPHABLIT(Ptype, Ctype, do_blend)				 \
slouken@0
  1201
	do {								 \
slouken@0
  1202
	    int linecount = srcrect->h;					 \
slouken@0
  1203
	    do {							 \
slouken@0
  1204
		int ofs = 0;						 \
slouken@0
  1205
		/* blit opaque pixels on one line */			 \
slouken@0
  1206
		do {							 \
slouken@0
  1207
		    unsigned run;					 \
slouken@0
  1208
		    ofs += ((Ctype *)srcbuf)[0];			 \
slouken@0
  1209
		    run = ((Ctype *)srcbuf)[1];				 \
slouken@0
  1210
		    srcbuf += 2 * sizeof(Ctype);			 \
slouken@0
  1211
		    if(run) {						 \
slouken@1
  1212
			PIXEL_COPY(dstbuf + ofs * sizeof(Ptype), srcbuf, \
slouken@1
  1213
				   run, sizeof(Ptype));			 \
slouken@0
  1214
			srcbuf += run * sizeof(Ptype);			 \
slouken@0
  1215
			ofs += run;					 \
slouken@0
  1216
		    } else if(!ofs)					 \
slouken@0
  1217
			goto done;					 \
slouken@0
  1218
		} while(ofs < w);					 \
slouken@0
  1219
		/* skip padding if necessary */				 \
slouken@0
  1220
		if(sizeof(Ptype) == 2)					 \
slouken@0
  1221
		    srcbuf += (unsigned long)srcbuf & 2;		 \
slouken@0
  1222
		/* blit translucent pixels on the same line */		 \
slouken@0
  1223
		ofs = 0;						 \
slouken@0
  1224
		do {							 \
slouken@0
  1225
		    unsigned run;					 \
slouken@0
  1226
		    ofs += ((Uint16 *)srcbuf)[0];			 \
slouken@0
  1227
		    run = ((Uint16 *)srcbuf)[1];			 \
slouken@0
  1228
		    srcbuf += 4;					 \
slouken@0
  1229
		    if(run) {						 \
slouken@0
  1230
			Ptype *dst = (Ptype *)dstbuf + ofs;		 \
slouken@0
  1231
			unsigned i;					 \
slouken@0
  1232
			for(i = 0; i < run; i++) {			 \
slouken@0
  1233
			    Uint32 src = *(Uint32 *)srcbuf;		 \
slouken@0
  1234
			    do_blend(src, *dst);			 \
slouken@0
  1235
			    srcbuf += 4;				 \
slouken@0
  1236
			    dst++;					 \
slouken@0
  1237
			}						 \
slouken@0
  1238
			ofs += run;					 \
slouken@0
  1239
		    }							 \
slouken@0
  1240
		} while(ofs < w);					 \
slouken@0
  1241
		dstbuf += dst->pitch;					 \
slouken@0
  1242
	    } while(--linecount);					 \
slouken@0
  1243
	} while(0)
slouken@0
  1244
slouken@0
  1245
	switch(df->BytesPerPixel) {
slouken@0
  1246
	case 2:
slouken@0
  1247
	    if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0
slouken@0
  1248
	       || df->Bmask == 0x07e0)
slouken@0
  1249
		RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_565);
slouken@0
  1250
	    else
slouken@0
  1251
		RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_555);
slouken@0
  1252
	    break;
slouken@0
  1253
	case 4:
slouken@0
  1254
	    RLEALPHABLIT(Uint32, Uint16, BLIT_TRANSL_888);
slouken@0
  1255
	    break;
slouken@0
  1256
	}
slouken@0
  1257
    }
slouken@0
  1258
slouken@0
  1259
 done:
slouken@0
  1260
    /* Unlock the destination if necessary */
slouken@526
  1261
    if ( SDL_MUSTLOCK(dst) ) {
slouken@526
  1262
	SDL_UnlockSurface(dst);
slouken@0
  1263
    }
slouken@0
  1264
    return 0;
slouken@0
  1265
}
slouken@0
  1266
slouken@0
  1267
/*
slouken@0
  1268
 * Auxiliary functions:
slouken@0
  1269
 * The encoding functions take 32bpp rgb + a, and
slouken@0
  1270
 * return the number of bytes copied to the destination.
slouken@0
  1271
 * The decoding functions copy to 32bpp rgb + a, and
slouken@0
  1272
 * return the number of bytes copied from the source.
slouken@0
  1273
 * These are only used in the encoder and un-RLE code and are therefore not
slouken@0
  1274
 * highly optimised.
slouken@0
  1275
 */
slouken@0
  1276
slouken@0
  1277
/* encode 32bpp rgb + a into 16bpp rgb, losing alpha */
slouken@0
  1278
static int copy_opaque_16(void *dst, Uint32 *src, int n,
slouken@0
  1279
			  SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt)
slouken@0
  1280
{
slouken@0
  1281
    int i;
slouken@0
  1282
    Uint16 *d = dst;
slouken@0
  1283
    for(i = 0; i < n; i++) {
slouken@0
  1284
	unsigned r, g, b;
slouken@0
  1285
	RGB_FROM_PIXEL(*src, sfmt, r, g, b);
slouken@0
  1286
	PIXEL_FROM_RGB(*d, dfmt, r, g, b);
slouken@0
  1287
	src++;
slouken@0
  1288
	d++;
slouken@0
  1289
    }
slouken@0
  1290
    return n * 2;
slouken@0
  1291
}
slouken@0
  1292
slouken@0
  1293
/* decode opaque pixels from 16bpp to 32bpp rgb + a */
slouken@0
  1294
static int uncopy_opaque_16(Uint32 *dst, void *src, int n,
slouken@0
  1295
			    RLEDestFormat *sfmt, SDL_PixelFormat *dfmt)
slouken@0
  1296
{
slouken@0
  1297
    int i;
slouken@0
  1298
    Uint16 *s = src;
slouken@0
  1299
    unsigned alpha = dfmt->Amask ? 255 : 0;
slouken@0
  1300
    for(i = 0; i < n; i++) {
slouken@0
  1301
	unsigned r, g, b;
slouken@0
  1302
	RGB_FROM_PIXEL(*s, sfmt, r, g, b);
slouken@0
  1303
	PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, alpha);
slouken@0
  1304
	s++;
slouken@0
  1305
	dst++;
slouken@0
  1306
    }
slouken@0
  1307
    return n * 2;
slouken@0
  1308
}
slouken@0
  1309
slouken@0
  1310
slouken@0
  1311
slouken@0
  1312
/* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 565 */
slouken@0
  1313
static int copy_transl_565(void *dst, Uint32 *src, int n,
slouken@0
  1314
			   SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt)
slouken@0
  1315
{
slouken@0
  1316
    int i;
slouken@0
  1317
    Uint32 *d = dst;
slouken@0
  1318
    for(i = 0; i < n; i++) {
slouken@0
  1319
	unsigned r, g, b, a;
slouken@0
  1320
	Uint16 pix;
slouken@0
  1321
	RGBA_FROM_8888(*src, sfmt, r, g, b, a);
slouken@0
  1322
	PIXEL_FROM_RGB(pix, dfmt, r, g, b);
slouken@0
  1323
	*d = ((pix & 0x7e0) << 16) | (pix & 0xf81f) | ((a << 2) & 0x7e0);
slouken@0
  1324
	src++;
slouken@0
  1325
	d++;
slouken@0
  1326
    }
slouken@0
  1327
    return n * 4;
slouken@0
  1328
}
slouken@0
  1329
slouken@0
  1330
/* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 555 */
slouken@0
  1331
static int copy_transl_555(void *dst, Uint32 *src, int n,
slouken@0
  1332
			   SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt)
slouken@0
  1333
{
slouken@0
  1334
    int i;
slouken@0
  1335
    Uint32 *d = dst;
slouken@0
  1336
    for(i = 0; i < n; i++) {
slouken@0
  1337
	unsigned r, g, b, a;
slouken@0
  1338
	Uint16 pix;
slouken@0
  1339
	RGBA_FROM_8888(*src, sfmt, r, g, b, a);
slouken@0
  1340
	PIXEL_FROM_RGB(pix, dfmt, r, g, b);
slouken@0
  1341
	*d = ((pix & 0x3e0) << 16) | (pix & 0xfc1f) | ((a << 2) & 0x3e0);
slouken@0
  1342
	src++;
slouken@0
  1343
	d++;
slouken@0
  1344
    }
slouken@0
  1345
    return n * 4;
slouken@0
  1346
}
slouken@0
  1347
slouken@0
  1348
/* decode translucent pixels from 32bpp GORAB to 32bpp rgb + a */
slouken@0
  1349
static int uncopy_transl_16(Uint32 *dst, void *src, int n,
slouken@0
  1350
			    RLEDestFormat *sfmt, SDL_PixelFormat *dfmt)
slouken@0
  1351
{
slouken@0
  1352
    int i;
slouken@0
  1353
    Uint32 *s = src;
slouken@0
  1354
    for(i = 0; i < n; i++) {
slouken@0
  1355
	unsigned r, g, b, a;
slouken@0
  1356
	Uint32 pix = *s++;
slouken@0
  1357
	a = (pix & 0x3e0) >> 2;
slouken@0
  1358
	pix = (pix & ~0x3e0) | pix >> 16;
slouken@0
  1359
	RGB_FROM_PIXEL(pix, sfmt, r, g, b);
slouken@0
  1360
	PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a);
slouken@0
  1361
	dst++;
slouken@0
  1362
    }
slouken@0
  1363
    return n * 4;
slouken@0
  1364
}
slouken@0
  1365
slouken@0
  1366
/* encode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */
slouken@0
  1367
static int copy_32(void *dst, Uint32 *src, int n,
slouken@0
  1368
		   SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt)
slouken@0
  1369
{
slouken@0
  1370
    int i;
slouken@0
  1371
    Uint32 *d = dst;
slouken@0
  1372
    for(i = 0; i < n; i++) {
slouken@0
  1373
	unsigned r, g, b, a;
slouken@0
  1374
	Uint32 pixel;
slouken@0
  1375
	RGBA_FROM_8888(*src, sfmt, r, g, b, a);
slouken@0
  1376
	PIXEL_FROM_RGB(pixel, dfmt, r, g, b);
slouken@0
  1377
	*d++ = pixel | a << 24;
slouken@0
  1378
	src++;
slouken@0
  1379
    }
slouken@0
  1380
    return n * 4;
slouken@0
  1381
}
slouken@0
  1382
slouken@0
  1383
/* decode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */
slouken@0
  1384
static int uncopy_32(Uint32 *dst, void *src, int n,
slouken@0
  1385
		     RLEDestFormat *sfmt, SDL_PixelFormat *dfmt)
slouken@0
  1386
{
slouken@0
  1387
    int i;
slouken@0
  1388
    Uint32 *s = src;
slouken@0
  1389
    for(i = 0; i < n; i++) {
slouken@0
  1390
	unsigned r, g, b, a;
slouken@0
  1391
	Uint32 pixel = *s++;
slouken@0
  1392
	RGB_FROM_PIXEL(pixel, sfmt, r, g, b);
slouken@0
  1393
	a = pixel >> 24;
slouken@0
  1394
	PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a);
slouken@0
  1395
	dst++;
slouken@0
  1396
    }
slouken@0
  1397
    return n * 4;
slouken@0
  1398
}
slouken@0
  1399
slouken@0
  1400
#define ISOPAQUE(pixel, fmt) ((((pixel) & fmt->Amask) >> fmt->Ashift) == 255)
slouken@0
  1401
slouken@0
  1402
#define ISTRANSL(pixel, fmt)	\
slouken@0
  1403
    ((unsigned)((((pixel) & fmt->Amask) >> fmt->Ashift) - 1U) < 254U)
slouken@0
  1404
slouken@0
  1405
/* convert surface to be quickly alpha-blittable onto dest, if possible */
slouken@0
  1406
static int RLEAlphaSurface(SDL_Surface *surface)
slouken@0
  1407
{
slouken@0
  1408
    SDL_Surface *dest;
slouken@0
  1409
    SDL_PixelFormat *df;
slouken@0
  1410
    int maxsize = 0;
slouken@0
  1411
    int max_opaque_run;
slouken@0
  1412
    int max_transl_run = 65535;
slouken@0
  1413
    unsigned masksum;
slouken@0
  1414
    Uint8 *rlebuf, *dst;
slouken@0
  1415
    int (*copy_opaque)(void *, Uint32 *, int,
slouken@0
  1416
		       SDL_PixelFormat *, SDL_PixelFormat *);
slouken@0
  1417
    int (*copy_transl)(void *, Uint32 *, int,
slouken@0
  1418
		       SDL_PixelFormat *, SDL_PixelFormat *);
slouken@0
  1419
slouken@0
  1420
    dest = surface->map->dst;
slouken@0
  1421
    if(!dest)
slouken@0
  1422
	return -1;
slouken@0
  1423
    df = dest->format;
slouken@0
  1424
    if(surface->format->BitsPerPixel != 32)
slouken@0
  1425
	return -1;		/* only 32bpp source supported */
slouken@0
  1426
slouken@0
  1427
    /* find out whether the destination is one we support,
slouken@0
  1428
       and determine the max size of the encoded result */
slouken@0
  1429
    masksum = df->Rmask | df->Gmask | df->Bmask;
slouken@0
  1430
    switch(df->BytesPerPixel) {
slouken@0
  1431
    case 2:
slouken@0
  1432
	/* 16bpp: only support 565 and 555 formats */
slouken@0
  1433
	switch(masksum) {
slouken@0
  1434
	case 0xffff:
slouken@0
  1435
	    if(df->Gmask == 0x07e0
slouken@0
  1436
	       || df->Rmask == 0x07e0 || df->Bmask == 0x07e0) {
slouken@0
  1437
		copy_opaque = copy_opaque_16;
slouken@0
  1438
		copy_transl = copy_transl_565;
slouken@0
  1439
	    } else
slouken@0
  1440
		return -1;
slouken@0
  1441
	    break;
slouken@0
  1442
	case 0x7fff:
slouken@0
  1443
	    if(df->Gmask == 0x03e0
slouken@0
  1444
	       || df->Rmask == 0x03e0 || df->Bmask == 0x03e0) {
slouken@0
  1445
		copy_opaque = copy_opaque_16;
slouken@0
  1446
		copy_transl = copy_transl_555;
slouken@0
  1447
	    } else
slouken@0
  1448
		return -1;
slouken@0
  1449
	    break;
slouken@0
  1450
	default:
slouken@0
  1451
	    return -1;
slouken@0
  1452
	}
slouken@0
  1453
	max_opaque_run = 255;	/* runs stored as bytes */
slouken@0
  1454
slouken@0
  1455
	/* worst case is alternating opaque and translucent pixels,
slouken@0
  1456
	   with room for alignment padding between lines */
slouken@0
  1457
	maxsize = surface->h * (2 + (4 + 2) * (surface->w + 1)) + 2;
slouken@0
  1458
	break;
slouken@0
  1459
    case 4:
slouken@0
  1460
	if(masksum != 0x00ffffff)
slouken@0
  1461
	    return -1;		/* requires unused high byte */
slouken@0
  1462
	copy_opaque = copy_32;
slouken@0
  1463
	copy_transl = copy_32;
slouken@0
  1464
	max_opaque_run = 255;	/* runs stored as short ints */
slouken@0
  1465
slouken@0
  1466
	/* worst case is alternating opaque and translucent pixels */
slouken@0
  1467
	maxsize = surface->h * 2 * 4 * (surface->w + 1) + 4;
slouken@0
  1468
	break;
slouken@0
  1469
    default:
slouken@0
  1470
	return -1;		/* anything else unsupported right now */
slouken@0
  1471
    }
slouken@0
  1472
slouken@0
  1473
    maxsize += sizeof(RLEDestFormat);
slouken@0
  1474
    rlebuf = (Uint8 *)malloc(maxsize);
slouken@0
  1475
    if(!rlebuf) {
slouken@0
  1476
	SDL_OutOfMemory();
slouken@0
  1477
	return -1;
slouken@0
  1478
    }
slouken@0
  1479
    {
slouken@0
  1480
	/* save the destination format so we can undo the encoding later */
slouken@0
  1481
	RLEDestFormat *r = (RLEDestFormat *)rlebuf;
slouken@0
  1482
	r->BytesPerPixel = df->BytesPerPixel;
slouken@0
  1483
	r->Rloss = df->Rloss;
slouken@0
  1484
	r->Gloss = df->Gloss;
slouken@0
  1485
	r->Bloss = df->Bloss;
slouken@0
  1486
	r->Rshift = df->Rshift;
slouken@0
  1487
	r->Gshift = df->Gshift;
slouken@0
  1488
	r->Bshift = df->Bshift;
slouken@0
  1489
	r->Ashift = df->Ashift;
slouken@0
  1490
	r->Rmask = df->Rmask;
slouken@0
  1491
	r->Gmask = df->Gmask;
slouken@0
  1492
	r->Bmask = df->Bmask;
slouken@0
  1493
	r->Amask = df->Amask;
slouken@0
  1494
    }
slouken@0
  1495
    dst = rlebuf + sizeof(RLEDestFormat);
slouken@0
  1496
slouken@0
  1497
    /* Do the actual encoding */
slouken@0
  1498
    {
slouken@0
  1499
	int x, y;
slouken@0
  1500
	int h = surface->h, w = surface->w;
slouken@0
  1501
	SDL_PixelFormat *sf = surface->format;
slouken@526
  1502
	Uint32 *src = (Uint32 *)surface->pixels;
slouken@0
  1503
	Uint8 *lastline = dst;	/* end of last non-blank line */
slouken@0
  1504
slouken@0
  1505
	/* opaque counts are 8 or 16 bits, depending on target depth */
slouken@0
  1506
#define ADD_OPAQUE_COUNTS(n, m)			\
slouken@0
  1507
	if(df->BytesPerPixel == 4) {		\
slouken@0
  1508
	    ((Uint16 *)dst)[0] = n;		\
slouken@0
  1509
	    ((Uint16 *)dst)[1] = m;		\
slouken@0
  1510
	    dst += 4;				\
slouken@0
  1511
	} else {				\
slouken@0
  1512
	    dst[0] = n;				\
slouken@0
  1513
	    dst[1] = m;				\
slouken@0
  1514
	    dst += 2;				\
slouken@0
  1515
	}
slouken@0
  1516
slouken@0
  1517
	/* translucent counts are always 16 bit */
slouken@0
  1518
#define ADD_TRANSL_COUNTS(n, m)		\
slouken@0
  1519
	(((Uint16 *)dst)[0] = n, ((Uint16 *)dst)[1] = m, dst += 4)
slouken@0
  1520
slouken@0
  1521
	for(y = 0; y < h; y++) {
slouken@0
  1522
	    int runstart, skipstart;
slouken@0
  1523
	    int blankline = 0;
slouken@0
  1524
	    /* First encode all opaque pixels of a scan line */
slouken@0
  1525
	    x = 0;
slouken@0
  1526
	    do {
slouken@0
  1527
		int run, skip, len;
slouken@0
  1528
		skipstart = x;
slouken@0
  1529
		while(x < w && !ISOPAQUE(src[x], sf))
slouken@0
  1530
		    x++;
slouken@0
  1531
		runstart = x;
slouken@0
  1532
		while(x < w && ISOPAQUE(src[x], sf))
slouken@0
  1533
		    x++;
slouken@0
  1534
		skip = runstart - skipstart;
slouken@0
  1535
		if(skip == w)
slouken@0
  1536
		    blankline = 1;
slouken@0
  1537
		run = x - runstart;
slouken@0
  1538
		while(skip > max_opaque_run) {
slouken@0
  1539
		    ADD_OPAQUE_COUNTS(max_opaque_run, 0);
slouken@0
  1540
		    skip -= max_opaque_run;
slouken@0
  1541
		}
slouken@0
  1542
		len = MIN(run, max_opaque_run);
slouken@0
  1543
		ADD_OPAQUE_COUNTS(skip, len);
slouken@0
  1544
		dst += copy_opaque(dst, src + runstart, len, sf, df);
slouken@0
  1545
		runstart += len;
slouken@0
  1546
		run -= len;
slouken@0
  1547
		while(run) {
slouken@0
  1548
		    len = MIN(run, max_opaque_run);
slouken@0
  1549
		    ADD_OPAQUE_COUNTS(0, len);
slouken@0
  1550
		    dst += copy_opaque(dst, src + runstart, len, sf, df);
slouken@0
  1551
		    runstart += len;
slouken@0
  1552
		    run -= len;
slouken@0
  1553
		}
slouken@0
  1554
	    } while(x < w);
slouken@0
  1555
slouken@0
  1556
	    /* Make sure the next output address is 32-bit aligned */
slouken@0
  1557
	    dst += (unsigned long)dst & 2;
slouken@0
  1558
slouken@0
  1559
	    /* Next, encode all translucent pixels of the same scan line */
slouken@0
  1560
	    x = 0;
slouken@0
  1561
	    do {
slouken@0
  1562
		int run, skip, len;
slouken@0
  1563
		skipstart = x;
slouken@0
  1564
		while(x < w && !ISTRANSL(src[x], sf))
slouken@0
  1565
		    x++;
slouken@0
  1566
		runstart = x;
slouken@0
  1567
		while(x < w && ISTRANSL(src[x], sf))
slouken@0
  1568
		    x++;
slouken@0
  1569
		skip = runstart - skipstart;
slouken@0
  1570
		blankline &= (skip == w);
slouken@0
  1571
		run = x - runstart;
slouken@0
  1572
		while(skip > max_transl_run) {
slouken@0
  1573
		    ADD_TRANSL_COUNTS(max_transl_run, 0);
slouken@0
  1574
		    skip -= max_transl_run;
slouken@0
  1575
		}
slouken@0
  1576
		len = MIN(run, max_transl_run);
slouken@0
  1577
		ADD_TRANSL_COUNTS(skip, len);
slouken@0
  1578
		dst += copy_transl(dst, src + runstart, len, sf, df);
slouken@0
  1579
		runstart += len;
slouken@0
  1580
		run -= len;
slouken@0
  1581
		while(run) {
slouken@0
  1582
		    len = MIN(run, max_transl_run);
slouken@0
  1583
		    ADD_TRANSL_COUNTS(0, len);
slouken@0
  1584
		    dst += copy_transl(dst, src + runstart, len, sf, df);
slouken@0
  1585
		    runstart += len;
slouken@0
  1586
		    run -= len;
slouken@0
  1587
		}
slouken@0
  1588
		if(!blankline)
slouken@0
  1589
		    lastline = dst;
slouken@0
  1590
	    } while(x < w);
slouken@0
  1591
slouken@0
  1592
	    src += surface->pitch >> 2;
slouken@0
  1593
	}
slouken@0
  1594
	dst = lastline;		/* back up past trailing blank lines */
slouken@0
  1595
	ADD_OPAQUE_COUNTS(0, 0);
slouken@0
  1596
    }
slouken@0
  1597
slouken@0
  1598
#undef ADD_OPAQUE_COUNTS
slouken@0
  1599
#undef ADD_TRANSL_COUNTS
slouken@0
  1600
slouken@0
  1601
    /* Now that we have it encoded, release the original pixels */
slouken@0
  1602
    if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC
slouken@0
  1603
       && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) {
slouken@0
  1604
	free( surface->pixels );
slouken@0
  1605
	surface->pixels = NULL;
slouken@0
  1606
    }
slouken@0
  1607
slouken@0
  1608
    /* realloc the buffer to release unused memory */
slouken@0
  1609
    {
slouken@0
  1610
	Uint8 *p = realloc(rlebuf, dst - rlebuf);
slouken@0
  1611
	if(!p)
slouken@0
  1612
	    p = rlebuf;
slouken@0
  1613
	surface->map->sw_data->aux_data = p;
slouken@0
  1614
    }
slouken@0
  1615
slouken@0
  1616
    return 0;
slouken@0
  1617
}
slouken@0
  1618
slouken@0
  1619
static Uint32 getpix_8(Uint8 *srcbuf)
slouken@0
  1620
{
slouken@0
  1621
    return *srcbuf;
slouken@0
  1622
}
slouken@0
  1623
slouken@0
  1624
static Uint32 getpix_16(Uint8 *srcbuf)
slouken@0
  1625
{
slouken@0
  1626
    return *(Uint16 *)srcbuf;
slouken@0
  1627
}
slouken@0
  1628
slouken@0
  1629
static Uint32 getpix_24(Uint8 *srcbuf)
slouken@0
  1630
{
slouken@0
  1631
    if(SDL_BYTEORDER == SDL_LIL_ENDIAN)
slouken@0
  1632
	return srcbuf[0] + (srcbuf[1] << 8) + (srcbuf[2] << 16);
slouken@0
  1633
    else
slouken@0
  1634
	return (srcbuf[0] << 16) + (srcbuf[1] << 8) + srcbuf[2];
slouken@0
  1635
}
slouken@0
  1636
slouken@0
  1637
static Uint32 getpix_32(Uint8 *srcbuf)
slouken@0
  1638
{
slouken@0
  1639
    return *(Uint32 *)srcbuf;
slouken@0
  1640
}
slouken@0
  1641
slouken@0
  1642
typedef Uint32 (*getpix_func)(Uint8 *);
slouken@0
  1643
slouken@0
  1644
static getpix_func getpixes[4] = {
slouken@0
  1645
    getpix_8, getpix_16, getpix_24, getpix_32
slouken@0
  1646
};
slouken@0
  1647
slouken@0
  1648
static int RLEColorkeySurface(SDL_Surface *surface)
slouken@0
  1649
{
slouken@0
  1650
        Uint8 *rlebuf, *dst;
slouken@0
  1651
	int maxn;
slouken@0
  1652
	int y;
slouken@0
  1653
	Uint8 *srcbuf, *curbuf, *lastline;
slouken@0
  1654
	int maxsize = 0;
slouken@0
  1655
	int skip, run;
slouken@0
  1656
	int bpp = surface->format->BytesPerPixel;
slouken@0
  1657
	getpix_func getpix;
slouken@0
  1658
	Uint32 ckey, rgbmask;
slouken@0
  1659
	int w, h;
slouken@0
  1660
slouken@0
  1661
	/* calculate the worst case size for the compressed surface */
slouken@0
  1662
	switch(bpp) {
slouken@0
  1663
	case 1:
slouken@0
  1664
	    /* worst case is alternating opaque and transparent pixels,
slouken@0
  1665
	       starting with an opaque pixel */
slouken@0
  1666
	    maxsize = surface->h * 3 * (surface->w / 2 + 1) + 2;
slouken@0
  1667
	    break;
slouken@0
  1668
	case 2:
slouken@0
  1669
	case 3:
slouken@0
  1670
	    /* worst case is solid runs, at most 255 pixels wide */
slouken@0
  1671
	    maxsize = surface->h * (2 * (surface->w / 255 + 1)
slouken@0
  1672
				    + surface->w * bpp) + 2;
slouken@0
  1673
	    break;
slouken@0
  1674
	case 4:
slouken@0
  1675
	    /* worst case is solid runs, at most 65535 pixels wide */
slouken@0
  1676
	    maxsize = surface->h * (4 * (surface->w / 65535 + 1)
slouken@0
  1677
				    + surface->w * 4) + 4;
slouken@0
  1678
	    break;
slouken@0
  1679
	}
slouken@0
  1680
slouken@0
  1681
	rlebuf = (Uint8 *)malloc(maxsize);
slouken@0
  1682
	if ( rlebuf == NULL ) {
slouken@0
  1683
		SDL_OutOfMemory();
slouken@0
  1684
		return(-1);
slouken@0
  1685
	}
slouken@0
  1686
slouken@0
  1687
	/* Set up the conversion */
slouken@526
  1688
	srcbuf = (Uint8 *)surface->pixels;
slouken@0
  1689
	curbuf = srcbuf;
slouken@0
  1690
	maxn = bpp == 4 ? 65535 : 255;
slouken@0
  1691
	skip = run = 0;
slouken@0
  1692
	dst = rlebuf;
slouken@0
  1693
	rgbmask = ~surface->format->Amask;
slouken@0
  1694
	ckey = surface->format->colorkey & rgbmask;
slouken@0
  1695
	lastline = dst;
slouken@0
  1696
	getpix = getpixes[bpp - 1];
slouken@0
  1697
	w = surface->w;
slouken@0
  1698
	h = surface->h;
slouken@0
  1699
slouken@0
  1700
#define ADD_COUNTS(n, m)			\
slouken@0
  1701
	if(bpp == 4) {				\
slouken@0
  1702
	    ((Uint16 *)dst)[0] = n;		\
slouken@0
  1703
	    ((Uint16 *)dst)[1] = m;		\
slouken@0
  1704
	    dst += 4;				\
slouken@0
  1705
	} else {				\
slouken@0
  1706
	    dst[0] = n;				\
slouken@0
  1707
	    dst[1] = m;				\
slouken@0
  1708
	    dst += 2;				\
slouken@0
  1709
	}
slouken@0
  1710
slouken@0
  1711
	for(y = 0; y < h; y++) {
slouken@0
  1712
	    int x = 0;
slouken@0
  1713
	    int blankline = 0;
slouken@0
  1714
	    do {
slouken@0
  1715
		int run, skip, len;
slouken@0
  1716
		int runstart;
slouken@0
  1717
		int skipstart = x;
slouken@0
  1718
slouken@0
  1719
		/* find run of transparent, then opaque pixels */
slouken@0
  1720
		while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) == ckey)
slouken@0
  1721
		    x++;
slouken@0
  1722
		runstart = x;
slouken@0
  1723
		while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) != ckey)
slouken@0
  1724
		    x++;
slouken@0
  1725
		skip = runstart - skipstart;
slouken@0
  1726
		if(skip == w)
slouken@0
  1727
		    blankline = 1;
slouken@0
  1728
		run = x - runstart;
slouken@0
  1729
slouken@0
  1730
		/* encode segment */
slouken@0
  1731
		while(skip > maxn) {
slouken@0
  1732
		    ADD_COUNTS(maxn, 0);
slouken@0
  1733
		    skip -= maxn;
slouken@0
  1734
		}
slouken@0
  1735
		len = MIN(run, maxn);
slouken@0
  1736
		ADD_COUNTS(skip, len);
slouken@0
  1737
		memcpy(dst, srcbuf + runstart * bpp, len * bpp);
slouken@0
  1738
		dst += len * bpp;
slouken@0
  1739
		run -= len;
slouken@0
  1740
		runstart += len;
slouken@0
  1741
		while(run) {
slouken@0
  1742
		    len = MIN(run, maxn);
slouken@0
  1743
		    ADD_COUNTS(0, len);
slouken@0
  1744
		    memcpy(dst, srcbuf + runstart * bpp, len * bpp);
slouken@0
  1745
		    dst += len * bpp;
slouken@0
  1746
		    runstart += len;
slouken@0
  1747
		    run -= len;
slouken@0
  1748
		}
slouken@0
  1749
		if(!blankline)
slouken@0
  1750
		    lastline = dst;
slouken@0
  1751
	    } while(x < w);
slouken@0
  1752
slouken@0
  1753
	    srcbuf += surface->pitch;
slouken@0
  1754
	}
slouken@0
  1755
	dst = lastline;		/* back up bast trailing blank lines */
slouken@0
  1756
	ADD_COUNTS(0, 0);
slouken@0
  1757
slouken@0
  1758
#undef ADD_COUNTS
slouken@0
  1759
slouken@0
  1760
	/* Now that we have it encoded, release the original pixels */
slouken@0
  1761
	if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC
slouken@0
  1762
	   && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) {
slouken@0
  1763
	    free( surface->pixels );
slouken@0
  1764
	    surface->pixels = NULL;
slouken@0
  1765
	}
slouken@0
  1766
slouken@0
  1767
	/* realloc the buffer to release unused memory */
slouken@0
  1768
	{
slouken@0
  1769
	    /* If realloc returns NULL, the original block is left intact */
slouken@0
  1770
	    Uint8 *p = realloc(rlebuf, dst - rlebuf);
slouken@0
  1771
	    if(!p)
slouken@0
  1772
		p = rlebuf;
slouken@0
  1773
	    surface->map->sw_data->aux_data = p;
slouken@0
  1774
	}
slouken@0
  1775
slouken@0
  1776
	return(0);
slouken@0
  1777
}
slouken@0
  1778
slouken@0
  1779
int SDL_RLESurface(SDL_Surface *surface)
slouken@0
  1780
{
slouken@0
  1781
	int retcode;
slouken@0
  1782
slouken@0
  1783
	/* Clear any previous RLE conversion */
slouken@0
  1784
	if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
slouken@0
  1785
		SDL_UnRLESurface(surface, 1);
slouken@0
  1786
	}
slouken@0
  1787
slouken@0
  1788
	/* We don't support RLE encoding of bitmaps */
slouken@0
  1789
	if ( surface->format->BitsPerPixel < 8 ) {
slouken@0
  1790
		return(-1);
slouken@0
  1791
	}
slouken@0
  1792
slouken@0
  1793
	/* Lock the surface if it's in hardware */
slouken@526
  1794
	if ( SDL_MUSTLOCK(surface) ) {
slouken@526
  1795
		if ( SDL_LockSurface(surface) < 0 ) {
slouken@0
  1796
			return(-1);
slouken@0
  1797
		}
slouken@0
  1798
	}
slouken@0
  1799
slouken@0
  1800
	/* Encode */
slouken@0
  1801
	if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) {
slouken@0
  1802
	    retcode = RLEColorkeySurface(surface);
slouken@0
  1803
	} else {
slouken@0
  1804
	    if((surface->flags & SDL_SRCALPHA) == SDL_SRCALPHA
slouken@0
  1805
	       && surface->format->Amask != 0)
slouken@0
  1806
		retcode = RLEAlphaSurface(surface);
slouken@0
  1807
	    else
slouken@0
  1808
		retcode = -1;	/* no RLE for per-surface alpha sans ckey */
slouken@0
  1809
	}
slouken@0
  1810
slouken@0
  1811
	/* Unlock the surface if it's in hardware */
slouken@526
  1812
	if ( SDL_MUSTLOCK(surface) ) {
slouken@526
  1813
		SDL_UnlockSurface(surface);
slouken@0
  1814
	}
slouken@0
  1815
slouken@0
  1816
	if(retcode < 0)
slouken@0
  1817
	    return -1;
slouken@0
  1818
slouken@0
  1819
	/* The surface is now accelerated */
slouken@0
  1820
	surface->flags |= SDL_RLEACCEL;
slouken@0
  1821
slouken@0
  1822
	return(0);
slouken@0
  1823
}
slouken@0
  1824
slouken@0
  1825
/*
slouken@0
  1826
 * Un-RLE a surface with pixel alpha
slouken@0
  1827
 * This may not give back exactly the image before RLE-encoding; all
slouken@0
  1828
 * completely transparent pixels will be lost, and colour and alpha depth
slouken@0
  1829
 * may have been reduced (when encoding for 16bpp targets).
slouken@0
  1830
 */
slouken@0
  1831
static void UnRLEAlpha(SDL_Surface *surface)
slouken@0
  1832
{
slouken@0
  1833
    Uint8 *srcbuf;
slouken@0
  1834
    Uint32 *dst;
slouken@0
  1835
    SDL_PixelFormat *sf = surface->format;
slouken@0
  1836
    RLEDestFormat *df = surface->map->sw_data->aux_data;
slouken@0
  1837
    int (*uncopy_opaque)(Uint32 *, void *, int,
slouken@0
  1838
			 RLEDestFormat *, SDL_PixelFormat *);
slouken@0
  1839
    int (*uncopy_transl)(Uint32 *, void *, int,
slouken@0
  1840
			 RLEDestFormat *, SDL_PixelFormat *);
slouken@0
  1841
    int w = surface->w;
slouken@0
  1842
    int bpp = df->BytesPerPixel;
slouken@0
  1843
slouken@0
  1844
    if(bpp == 2) {
slouken@0
  1845
	uncopy_opaque = uncopy_opaque_16;
slouken@0
  1846
	uncopy_transl = uncopy_transl_16;
slouken@0
  1847
    } else {
slouken@0
  1848
	uncopy_opaque = uncopy_transl = uncopy_32;
slouken@0
  1849
    }
slouken@0
  1850
slouken@0
  1851
    surface->pixels = malloc(surface->h * surface->pitch);
slouken@0
  1852
    /* fill background with transparent pixels */
slouken@0
  1853
    memset(surface->pixels, 0, surface->h * surface->pitch);
slouken@0
  1854
slouken@0
  1855
    dst = surface->pixels;
slouken@0
  1856
    srcbuf = (Uint8 *)(df + 1);
slouken@0
  1857
    for(;;) {
slouken@0
  1858
	/* copy opaque pixels */
slouken@0
  1859
	int ofs = 0;
slouken@0
  1860
	do {
slouken@0
  1861
	    unsigned run;
slouken@0
  1862
	    if(bpp == 2) {
slouken@0
  1863
		ofs += srcbuf[0];
slouken@0
  1864
		run = srcbuf[1];
slouken@0
  1865
		srcbuf += 2;
slouken@0
  1866
	    } else {
slouken@0
  1867
		ofs += ((Uint16 *)srcbuf)[0];
slouken@0
  1868
		run = ((Uint16 *)srcbuf)[1];
slouken@0
  1869
		srcbuf += 4;
slouken@0
  1870
	    }
slouken@0
  1871
	    if(run) {
slouken@0
  1872
		srcbuf += uncopy_opaque(dst + ofs, srcbuf, run, df, sf);
slouken@0
  1873
		ofs += run;
slouken@0
  1874
	    } else if(!ofs)
slouken@0
  1875
		return;
slouken@0
  1876
	} while(ofs < w);
slouken@0
  1877
slouken@0
  1878
	/* skip padding if needed */
slouken@0
  1879
	if(bpp == 2)
slouken@0
  1880
	    srcbuf += (unsigned long)srcbuf & 2;
slouken@0
  1881
	
slouken@0
  1882
	/* copy translucent pixels */
slouken@0
  1883
	ofs = 0;
slouken@0
  1884
	do {
slouken@0
  1885
	    unsigned run;
slouken@0
  1886
	    ofs += ((Uint16 *)srcbuf)[0];
slouken@0
  1887
	    run = ((Uint16 *)srcbuf)[1];
slouken@0
  1888
	    srcbuf += 4;
slouken@0
  1889
	    if(run) {
slouken@0
  1890
		srcbuf += uncopy_transl(dst + ofs, srcbuf, run, df, sf);
slouken@0
  1891
		ofs += run;
slouken@0
  1892
	    }
slouken@0
  1893
	} while(ofs < w);
slouken@0
  1894
	dst += surface->pitch >> 2;
slouken@0
  1895
    }
slouken@0
  1896
}
slouken@0
  1897
slouken@0
  1898
void SDL_UnRLESurface(SDL_Surface *surface, int recode)
slouken@0
  1899
{
slouken@0
  1900
    if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
slouken@0
  1901
	surface->flags &= ~SDL_RLEACCEL;
slouken@0
  1902
slouken@0
  1903
	if(recode && (surface->flags & SDL_PREALLOC) != SDL_PREALLOC
slouken@0
  1904
	   && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) {
slouken@0
  1905
	    if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) {
slouken@0
  1906
		SDL_Rect full;
slouken@0
  1907
		unsigned alpha_flag;
slouken@0
  1908
slouken@0
  1909
		/* re-create the original surface */
slouken@0
  1910
		surface->pixels = malloc(surface->h * surface->pitch);
slouken@0
  1911
slouken@0
  1912
		/* fill it with the background colour */
slouken@0
  1913
		SDL_FillRect(surface, NULL, surface->format->colorkey);
slouken@0
  1914
slouken@0
  1915
		/* now render the encoded surface */
slouken@0
  1916
		full.x = full.y = 0;
slouken@0
  1917
		full.w = surface->w;
slouken@0
  1918
		full.h = surface->h;
slouken@0
  1919
		alpha_flag = surface->flags & SDL_SRCALPHA;
slouken@0
  1920
		surface->flags &= ~SDL_SRCALPHA; /* opaque blit */
slouken@0
  1921
		SDL_RLEBlit(surface, &full, surface, &full);
slouken@0
  1922
		surface->flags |= alpha_flag;
slouken@0
  1923
	    } else
slouken@0
  1924
		UnRLEAlpha(surface);
slouken@0
  1925
	}
slouken@0
  1926
slouken@0
  1927
	if ( surface->map && surface->map->sw_data->aux_data ) {
slouken@0
  1928
	    free(surface->map->sw_data->aux_data);
slouken@0
  1929
	    surface->map->sw_data->aux_data = NULL;
slouken@0
  1930
	}
slouken@0
  1931
    }
slouken@0
  1932
}
slouken@0
  1933
slouken@0
  1934