src/video/SDL_RLEaccel.c
author Sam Lantinga <slouken@libsdl.org>
Wed, 01 Mar 2006 09:43:47 +0000
changeset 1456 84de7511f79f
parent 1428 5f52867ba65c
child 1662 782fd950bd46
child 1895 c121d94672cb
child 4159 a1b03ba2fcd0
permissions -rw-r--r--
Fixed a bunch of 64-bit compatibility problems
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 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 Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 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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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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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 "SDL_video.h"
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#include "SDL_sysvideo.h"
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#include "SDL_blit.h"
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#include "SDL_RLEaccel_c.h"
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#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) && SDL_ASSEMBLY_ROUTINES
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#define MMX_ASMBLIT
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#endif
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#ifdef MMX_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, (size_t)(len));		\
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    } else {						\
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	SDL_memcpy(to, from, (size_t)(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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#ifdef MMX_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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        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);			\
slouken@689
   305
        punpcklwd_r2r(mm7, mm7);			\
slouken@689
   306
        punpcklwd_r2r(mm7, mm7);			\
slouken@689
   307
	alpha &= ~(1+2+4);				\
slouken@689
   308
        i = (Uint32)alpha | (Uint32)alpha << 16;	\
slouken@689
   309
        movd_m2r(*(&i), mm0);				\
slouken@689
   310
        punpckldq_r2r(mm0, mm0);			\
slouken@689
   311
        i = ((int)(length) & 3);				\
slouken@689
   312
        ALPHA = alpha >> 3;				\
slouken@689
   313
	for(; i > 0; --i) {				\
slouken@689
   314
	    Uint32 s = *srcp++;				\
slouken@689
   315
	    Uint32 d = *dstp;				\
slouken@689
   316
	    s = (s | s << 16) & 0x03e07c1f;		\
slouken@689
   317
	    d = (d | d << 16) & 0x03e07c1f;		\
slouken@689
   318
	    d += (s - d) * ALPHA >> 5;			\
slouken@689
   319
	    d &= 0x03e07c1f;				\
slouken@689
   320
	    *dstp++ = d | d >> 16;			\
slouken@689
   321
	    n++;					\
slouken@689
   322
	}						\
slouken@689
   323
	i = (int)(length) - n;				\
slouken@689
   324
	for(; i > 0; --i) {				\
slouken@689
   325
	  movq_m2r((*dstp), mm3);			\
slouken@689
   326
	  movq_m2r((*srcp), mm2);			\
slouken@689
   327
	  movq_r2r(mm2, mm5);				\
slouken@689
   328
	  pand_r2r(mm1 , mm5);				\
slouken@689
   329
	  psrlq_i2r(10, mm5);				\
slouken@689
   330
	  movq_r2r(mm3, mm6);				\
slouken@689
   331
	  pand_r2r(mm1 , mm6);				\
slouken@689
   332
	  psrlq_i2r(10, mm6);				\
slouken@689
   333
	  psubw_r2r(mm6, mm5);				\
slouken@689
   334
	  pmullw_r2r(mm0, mm5);				\
slouken@689
   335
	  psrlw_i2r(8, mm5);				\
slouken@689
   336
	  paddw_r2r(mm5, mm6);				\
slouken@689
   337
	  psllq_i2r(10, mm6);				\
slouken@689
   338
	  pand_r2r(mm1, mm6);				\
slouken@689
   339
	  movq_r2r(mm4, mm5);				\
slouken@689
   340
	  por_r2r(mm7, mm5);				\
slouken@689
   341
	  pand_r2r(mm5, mm3);				\
slouken@689
   342
	  por_r2r(mm6, mm3);				\
slouken@689
   343
	  movq_r2r(mm2, mm5);				\
slouken@689
   344
	  pand_r2r(mm4 , mm5);				\
slouken@689
   345
	  psrlq_i2r(5, mm5);				\
slouken@689
   346
	  movq_r2r(mm3, mm6);				\
slouken@689
   347
	  pand_r2r(mm4 , mm6);				\
slouken@689
   348
	  psrlq_i2r(5, mm6);				\
slouken@689
   349
	  psubw_r2r(mm6, mm5);				\
slouken@689
   350
	  pmullw_r2r(mm0, mm5);				\
slouken@689
   351
	  psrlw_i2r(8, mm5);				\
slouken@689
   352
	  paddw_r2r(mm5, mm6);				\
slouken@689
   353
	  psllq_i2r(5, mm6);				\
slouken@689
   354
	  pand_r2r(mm4, mm6);				\
slouken@689
   355
	  movq_r2r(mm1, mm5);				\
slouken@689
   356
	  por_r2r(mm7, mm5);				\
slouken@689
   357
	  pand_r2r(mm5, mm3);				\
slouken@689
   358
	  por_r2r(mm6, mm3);				\
slouken@689
   359
	  movq_r2r(mm2, mm5);				\
slouken@689
   360
	  pand_r2r(mm7 , mm5);				\
slouken@689
   361
          movq_r2r(mm3, mm6);				\
slouken@689
   362
	  pand_r2r(mm7 , mm6);				\
slouken@689
   363
	  psubw_r2r(mm6, mm5);				\
slouken@689
   364
	  pmullw_r2r(mm0, mm5);				\
slouken@689
   365
	  psrlw_i2r(8, mm5);				\
slouken@689
   366
	  paddw_r2r(mm5, mm6);				\
slouken@689
   367
	  pand_r2r(mm7, mm6);				\
slouken@689
   368
	  movq_r2r(mm1, mm5);				\
slouken@689
   369
	  por_r2r(mm4, mm5);				\
slouken@689
   370
	  pand_r2r(mm5, mm3);				\
slouken@689
   371
	  por_r2r(mm6, mm3);				\
slouken@689
   372
	  movq_r2m(mm3, *dstp);				\
slouken@689
   373
	  srcp += 4;					\
slouken@689
   374
	  dstp += 4;					\
slouken@689
   375
	  i -= 3;					\
slouken@689
   376
	}						\
slouken@689
   377
	emms();						\
slouken@689
   378
    } while(0)
slouken@689
   379
slouken@689
   380
#endif
slouken@689
   381
slouken@0
   382
/*
slouken@0
   383
 * For 32bpp pixels on the form 0x00rrggbb:
slouken@0
   384
 * If we treat the middle component separately, we can process the two
slouken@0
   385
 * remaining in parallel. This is safe to do because of the gap to the left
slouken@0
   386
 * of each component, so the bits from the multiplication don't collide.
slouken@0
   387
 * This can be used for any RGB permutation of course.
slouken@0
   388
 */
slouken@0
   389
#define ALPHA_BLIT32_888(to, from, length, bpp, alpha)		\
slouken@0
   390
    do {							\
slouken@0
   391
        int i;							\
slouken@0
   392
	Uint32 *src = (Uint32 *)(from);				\
slouken@0
   393
	Uint32 *dst = (Uint32 *)(to);				\
slouken@0
   394
	for(i = 0; i < (int)(length); i++) {			\
slouken@0
   395
	    Uint32 s = *src++;					\
slouken@0
   396
	    Uint32 d = *dst;					\
slouken@0
   397
	    Uint32 s1 = s & 0xff00ff;				\
slouken@0
   398
	    Uint32 d1 = d & 0xff00ff;				\
slouken@0
   399
	    d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff;	\
slouken@0
   400
	    s &= 0xff00;					\
slouken@0
   401
	    d &= 0xff00;					\
slouken@0
   402
	    d = (d + ((s - d) * alpha >> 8)) & 0xff00;		\
slouken@0
   403
	    *dst++ = d1 | d;					\
slouken@0
   404
	}							\
slouken@0
   405
    } while(0)
slouken@0
   406
slouken@0
   407
/*
slouken@0
   408
 * For 16bpp pixels we can go a step further: put the middle component
slouken@0
   409
 * in the high 16 bits of a 32 bit word, and process all three RGB
slouken@0
   410
 * components at the same time. Since the smallest gap is here just
slouken@0
   411
 * 5 bits, we have to scale alpha down to 5 bits as well.
slouken@0
   412
 */
slouken@0
   413
#define ALPHA_BLIT16_565(to, from, length, bpp, alpha)	\
slouken@0
   414
    do {						\
slouken@0
   415
        int i;						\
slouken@0
   416
	Uint16 *src = (Uint16 *)(from);			\
slouken@0
   417
	Uint16 *dst = (Uint16 *)(to);			\
slouken@689
   418
	Uint32 ALPHA = alpha >> 3;			\
slouken@0
   419
	for(i = 0; i < (int)(length); i++) {		\
slouken@0
   420
	    Uint32 s = *src++;				\
slouken@0
   421
	    Uint32 d = *dst;				\
slouken@0
   422
	    s = (s | s << 16) & 0x07e0f81f;		\
slouken@0
   423
	    d = (d | d << 16) & 0x07e0f81f;		\
slouken@689
   424
	    d += (s - d) * ALPHA >> 5;			\
slouken@0
   425
	    d &= 0x07e0f81f;				\
slouken@1428
   426
	    *dst++ = (Uint16)(d | d >> 16);			\
slouken@0
   427
	}						\
slouken@0
   428
    } while(0)
slouken@0
   429
slouken@0
   430
#define ALPHA_BLIT16_555(to, from, length, bpp, alpha)	\
slouken@0
   431
    do {						\
slouken@0
   432
        int i;						\
slouken@0
   433
	Uint16 *src = (Uint16 *)(from);			\
slouken@0
   434
	Uint16 *dst = (Uint16 *)(to);			\
slouken@689
   435
	Uint32 ALPHA = alpha >> 3;			\
slouken@0
   436
	for(i = 0; i < (int)(length); i++) {		\
slouken@0
   437
	    Uint32 s = *src++;				\
slouken@0
   438
	    Uint32 d = *dst;				\
slouken@0
   439
	    s = (s | s << 16) & 0x03e07c1f;		\
slouken@0
   440
	    d = (d | d << 16) & 0x03e07c1f;		\
slouken@689
   441
	    d += (s - d) * ALPHA >> 5;			\
slouken@0
   442
	    d &= 0x03e07c1f;				\
slouken@1428
   443
	    *dst++ = (Uint16)(d | d >> 16);			\
slouken@0
   444
	}						\
slouken@0
   445
    } while(0)
slouken@0
   446
slouken@0
   447
/*
slouken@0
   448
 * The general slow catch-all function, for remaining depths and formats
slouken@0
   449
 */
slouken@0
   450
#define ALPHA_BLIT_ANY(to, from, length, bpp, alpha)			\
slouken@0
   451
    do {								\
slouken@0
   452
        int i;								\
slouken@0
   453
	Uint8 *src = from;						\
slouken@0
   454
	Uint8 *dst = to;						\
slouken@0
   455
	for(i = 0; i < (int)(length); i++) {				\
slouken@0
   456
	    Uint32 s, d;						\
slouken@0
   457
	    unsigned rs, gs, bs, rd, gd, bd;				\
slouken@0
   458
	    switch(bpp) {						\
slouken@0
   459
	    case 2:							\
slouken@0
   460
		s = *(Uint16 *)src;					\
slouken@0
   461
		d = *(Uint16 *)dst;					\
slouken@0
   462
		break;							\
slouken@0
   463
	    case 3:							\
slouken@0
   464
		if(SDL_BYTEORDER == SDL_BIG_ENDIAN) {			\
slouken@0
   465
		    s = (src[0] << 16) | (src[1] << 8) | src[2];	\
slouken@0
   466
		    d = (dst[0] << 16) | (dst[1] << 8) | dst[2];	\
slouken@0
   467
		} else {						\
slouken@0
   468
		    s = (src[2] << 16) | (src[1] << 8) | src[0];	\
slouken@0
   469
		    d = (dst[2] << 16) | (dst[1] << 8) | dst[0];	\
slouken@0
   470
		}							\
slouken@0
   471
		break;							\
slouken@0
   472
	    case 4:							\
slouken@0
   473
		s = *(Uint32 *)src;					\
slouken@0
   474
		d = *(Uint32 *)dst;					\
slouken@0
   475
		break;							\
slouken@0
   476
	    }								\
slouken@0
   477
	    RGB_FROM_PIXEL(s, fmt, rs, gs, bs);				\
slouken@0
   478
	    RGB_FROM_PIXEL(d, fmt, rd, gd, bd);				\
slouken@0
   479
	    rd += (rs - rd) * alpha >> 8;				\
slouken@0
   480
	    gd += (gs - gd) * alpha >> 8;				\
slouken@0
   481
	    bd += (bs - bd) * alpha >> 8;				\
slouken@0
   482
	    PIXEL_FROM_RGB(d, fmt, rd, gd, bd);				\
slouken@0
   483
	    switch(bpp) {						\
slouken@0
   484
	    case 2:							\
slouken@1428
   485
		*(Uint16 *)dst = (Uint16)d;					\
slouken@0
   486
		break;							\
slouken@0
   487
	    case 3:							\
slouken@0
   488
		if(SDL_BYTEORDER == SDL_BIG_ENDIAN) {			\
slouken@1428
   489
		    dst[0] = (Uint8)(d >> 16);					\
slouken@1428
   490
		    dst[1] = (Uint8)(d >> 8);					\
slouken@1428
   491
		    dst[2] = (Uint8)(d);						\
slouken@0
   492
		} else {						\
slouken@1428
   493
		    dst[0] = (Uint8)d;						\
slouken@1428
   494
		    dst[1] = (Uint8)(d >> 8);					\
slouken@1428
   495
		    dst[2] = (Uint8)(d >> 16);					\
slouken@0
   496
		}							\
slouken@0
   497
		break;							\
slouken@0
   498
	    case 4:							\
slouken@0
   499
		*(Uint32 *)dst = d;					\
slouken@0
   500
		break;							\
slouken@0
   501
	    }								\
slouken@0
   502
	    src += bpp;							\
slouken@0
   503
	    dst += bpp;							\
slouken@0
   504
	}								\
slouken@0
   505
    } while(0)
slouken@0
   506
slouken@880
   507
#ifdef MMX_ASMBLIT
slouken@0
   508
slouken@689
   509
#define ALPHA_BLIT32_888_50MMX(to, from, length, bpp, alpha)		\
slouken@689
   510
    do {								\
slouken@689
   511
	Uint32 *srcp = (Uint32 *)(from);				\
slouken@689
   512
	Uint32 *dstp = (Uint32 *)(to);					\
slouken@689
   513
        int i = 0x00fefefe;						\
slouken@689
   514
        movd_m2r(*(&i), mm4);						\
slouken@689
   515
        punpckldq_r2r(mm4, mm4);					\
slouken@689
   516
        i = 0x00010101;							\
slouken@689
   517
        movd_m2r(*(&i), mm3);						\
slouken@689
   518
        punpckldq_r2r(mm3, mm3);					\
slouken@689
   519
        i = (int)(length);						\
slouken@689
   520
        if( i & 1 ) {							\
slouken@689
   521
	  Uint32 s = *srcp++;						\
slouken@689
   522
	  Uint32 d = *dstp;						\
slouken@689
   523
	  *dstp++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1)	\
slouken@689
   524
		     + (s & d & 0x00010101);				\
slouken@689
   525
	  i--;								\
slouken@689
   526
	}								\
slouken@689
   527
	for(; i > 0; --i) {						\
slouken@689
   528
	    movq_m2r((*dstp), mm2); /* dst -> mm2 */			\
slouken@689
   529
	    movq_r2r(mm2, mm6);	/* dst -> mm6 */			\
slouken@689
   530
	    movq_m2r((*srcp), mm1); /* src -> mm1 */			\
slouken@689
   531
	    movq_r2r(mm1, mm5);	/* src -> mm5 */			\
slouken@689
   532
	    pand_r2r(mm4, mm6);	/* dst & 0x00fefefe -> mm6 */		\
slouken@689
   533
	    pand_r2r(mm4, mm5); /* src & 0x00fefefe -> mm5 */		\
slouken@689
   534
	    paddd_r2r(mm6, mm5); /* (dst & 0x00fefefe) + (dst & 0x00fefefe) -> mm5 */	\
slouken@689
   535
	    psrld_i2r(1, mm5);						\
slouken@689
   536
	    pand_r2r(mm1, mm2);	/* s & d -> mm2 */			\
slouken@689
   537
	    pand_r2r(mm3, mm2);	/* s & d & 0x00010101 -> mm2 */		\
slouken@689
   538
	    paddd_r2r(mm5, mm2);					\
slouken@689
   539
	    movq_r2m(mm2, (*dstp));					\
slouken@689
   540
	    dstp += 2;							\
slouken@689
   541
	    srcp += 2;							\
slouken@689
   542
	    i--;							\
slouken@689
   543
	}								\
slouken@689
   544
	emms();								\
slouken@689
   545
    } while(0)
slouken@689
   546
slouken@689
   547
#endif
slouken@689
   548
    
slouken@0
   549
/*
slouken@0
   550
 * Special case: 50% alpha (alpha=128)
slouken@0
   551
 * This is treated specially because it can be optimized very well, and
slouken@0
   552
 * since it is good for many cases of semi-translucency.
slouken@0
   553
 * The theory is to do all three components at the same time:
slouken@0
   554
 * First zero the lowest bit of each component, which gives us room to
slouken@0
   555
 * add them. Then shift right and add the sum of the lowest bits.
slouken@0
   556
 */
slouken@0
   557
#define ALPHA_BLIT32_888_50(to, from, length, bpp, alpha)		\
slouken@0
   558
    do {								\
slouken@0
   559
        int i;								\
slouken@0
   560
	Uint32 *src = (Uint32 *)(from);					\
slouken@0
   561
	Uint32 *dst = (Uint32 *)(to);					\
slouken@0
   562
	for(i = 0; i < (int)(length); i++) {				\
slouken@0
   563
	    Uint32 s = *src++;						\
slouken@0
   564
	    Uint32 d = *dst;						\
slouken@0
   565
	    *dst++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1)	\
slouken@0
   566
		     + (s & d & 0x00010101);				\
slouken@0
   567
	}								\
slouken@0
   568
    } while(0)
slouken@0
   569
slouken@0
   570
/*
slouken@0
   571
 * For 16bpp, we can actually blend two pixels in parallel, if we take
slouken@0
   572
 * care to shift before we add, not after.
slouken@0
   573
 */
slouken@0
   574
slouken@0
   575
/* helper: blend a single 16 bit pixel at 50% */
slouken@0
   576
#define BLEND16_50(dst, src, mask)			\
slouken@0
   577
    do {						\
slouken@1428
   578
	Uint32 s = *src++;				\
slouken@0
   579
	Uint32 d = *dst;				\
slouken@1428
   580
	*dst++ = (Uint16)((((s & mask) + (d & mask)) >> 1) +	\
slouken@1428
   581
	                  (s & d & (~mask & 0xffff)));		\
slouken@0
   582
    } while(0)
slouken@0
   583
slouken@0
   584
/* basic 16bpp blender. mask is the pixels to keep when adding. */
slouken@0
   585
#define ALPHA_BLIT16_50(to, from, length, bpp, alpha, mask)		\
slouken@0
   586
    do {								\
slouken@0
   587
	unsigned n = (length);						\
slouken@0
   588
	Uint16 *src = (Uint16 *)(from);					\
slouken@0
   589
	Uint16 *dst = (Uint16 *)(to);					\
slouken@1456
   590
	if(((uintptr_t)src ^ (uintptr_t)dst) & 3) {			\
slouken@0
   591
	    /* source and destination not in phase, blit one by one */	\
slouken@0
   592
	    while(n--)							\
slouken@0
   593
		BLEND16_50(dst, src, mask);				\
slouken@0
   594
	} else {							\
slouken@1456
   595
	    if((uintptr_t)src & 3) {					\
slouken@0
   596
		/* first odd pixel */					\
slouken@0
   597
		BLEND16_50(dst, src, mask);				\
slouken@0
   598
		n--;							\
slouken@0
   599
	    }								\
slouken@0
   600
	    for(; n > 1; n -= 2) {					\
slouken@0
   601
		Uint32 s = *(Uint32 *)src;				\
slouken@0
   602
		Uint32 d = *(Uint32 *)dst;				\
slouken@0
   603
		*(Uint32 *)dst = ((s & (mask | mask << 16)) >> 1)	\
slouken@0
   604
		               + ((d & (mask | mask << 16)) >> 1)	\
slouken@0
   605
		               + (s & d & (~(mask | mask << 16)));	\
slouken@0
   606
		src += 2;						\
slouken@0
   607
		dst += 2;						\
slouken@0
   608
	    }								\
slouken@0
   609
	    if(n)							\
slouken@0
   610
		BLEND16_50(dst, src, mask); /* last odd pixel */	\
slouken@0
   611
	}								\
slouken@0
   612
    } while(0)
slouken@0
   613
slouken@0
   614
#define ALPHA_BLIT16_565_50(to, from, length, bpp, alpha)	\
slouken@0
   615
    ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xf7de)
slouken@0
   616
slouken@0
   617
#define ALPHA_BLIT16_555_50(to, from, length, bpp, alpha)	\
slouken@0
   618
    ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xfbde)
slouken@0
   619
slouken@880
   620
#ifdef MMX_ASMBLIT
slouken@0
   621
slouken@0
   622
#define CHOOSE_BLIT(blitter, alpha, fmt)				\
slouken@0
   623
    do {								\
slouken@0
   624
        if(alpha == 255) {						\
slouken@0
   625
	    switch(fmt->BytesPerPixel) {				\
slouken@0
   626
	    case 1: blitter(1, Uint8, OPAQUE_BLIT); break;		\
slouken@0
   627
	    case 2: blitter(2, Uint8, OPAQUE_BLIT); break;		\
slouken@0
   628
	    case 3: blitter(3, Uint8, OPAQUE_BLIT); break;		\
slouken@0
   629
	    case 4: blitter(4, Uint16, OPAQUE_BLIT); break;		\
slouken@0
   630
	    }								\
slouken@0
   631
	} else {							\
slouken@0
   632
	    switch(fmt->BytesPerPixel) {				\
slouken@0
   633
	    case 1:							\
slouken@0
   634
		/* No 8bpp alpha blitting */				\
slouken@0
   635
		break;							\
slouken@0
   636
									\
slouken@0
   637
	    case 2:							\
slouken@0
   638
		switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) {		\
slouken@0
   639
		case 0xffff:						\
slouken@0
   640
		    if(fmt->Gmask == 0x07e0				\
slouken@0
   641
		       || fmt->Rmask == 0x07e0				\
slouken@0
   642
		       || fmt->Bmask == 0x07e0) {			\
slouken@0
   643
			if(alpha == 128)				\
slouken@0
   644
			    blitter(2, Uint8, ALPHA_BLIT16_565_50);	\
slouken@0
   645
			else {						\
slouken@739
   646
			    if(SDL_HasMMX())				\
slouken@689
   647
				blitter(2, Uint8, ALPHA_BLIT16_565MMX);	\
slouken@689
   648
			    else					\
slouken@689
   649
				blitter(2, Uint8, ALPHA_BLIT16_565);	\
slouken@689
   650
			}						\
slouken@689
   651
		    } else						\
slouken@689
   652
			goto general16;					\
slouken@689
   653
		    break;						\
slouken@689
   654
									\
slouken@689
   655
		case 0x7fff:						\
slouken@689
   656
		    if(fmt->Gmask == 0x03e0				\
slouken@689
   657
		       || fmt->Rmask == 0x03e0				\
slouken@689
   658
		       || fmt->Bmask == 0x03e0) {			\
slouken@689
   659
			if(alpha == 128)				\
slouken@689
   660
			    blitter(2, Uint8, ALPHA_BLIT16_555_50);	\
slouken@689
   661
			else {						\
slouken@739
   662
			    if(SDL_HasMMX())				\
slouken@689
   663
				blitter(2, Uint8, ALPHA_BLIT16_555MMX);	\
slouken@689
   664
			    else					\
slouken@689
   665
				blitter(2, Uint8, ALPHA_BLIT16_555);	\
slouken@689
   666
			}						\
slouken@689
   667
			break;						\
slouken@689
   668
		    }							\
slouken@689
   669
		    /* fallthrough */					\
slouken@689
   670
									\
slouken@689
   671
		default:						\
slouken@689
   672
		general16:						\
slouken@689
   673
		    blitter(2, Uint8, ALPHA_BLIT_ANY);			\
slouken@689
   674
		}							\
slouken@689
   675
		break;							\
slouken@689
   676
									\
slouken@689
   677
	    case 3:							\
slouken@689
   678
		blitter(3, Uint8, ALPHA_BLIT_ANY);			\
slouken@689
   679
		break;							\
slouken@689
   680
									\
slouken@689
   681
	    case 4:							\
slouken@689
   682
		if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff	\
slouken@689
   683
		   && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00	\
slouken@689
   684
		       || fmt->Bmask == 0xff00)) {			\
slouken@689
   685
		    if(alpha == 128)					\
slouken@689
   686
		    {							\
slouken@739
   687
			if(SDL_HasMMX())				\
slouken@689
   688
				blitter(4, Uint16, ALPHA_BLIT32_888_50MMX);\
slouken@689
   689
			else						\
slouken@689
   690
				blitter(4, Uint16, ALPHA_BLIT32_888_50);\
slouken@689
   691
		    }							\
slouken@689
   692
		    else						\
slouken@689
   693
		    {							\
slouken@739
   694
			if(SDL_HasMMX())				\
slouken@689
   695
				blitter(4, Uint16, ALPHA_BLIT32_888MMX);\
slouken@689
   696
			else						\
slouken@689
   697
				blitter(4, Uint16, ALPHA_BLIT32_888);	\
slouken@689
   698
		    }							\
slouken@689
   699
		} else							\
slouken@689
   700
		    blitter(4, Uint16, ALPHA_BLIT_ANY);			\
slouken@689
   701
		break;							\
slouken@689
   702
	    }								\
slouken@689
   703
	}								\
slouken@689
   704
    } while(0)
slouken@689
   705
slouken@689
   706
#else
slouken@689
   707
	
slouken@689
   708
#define CHOOSE_BLIT(blitter, alpha, fmt)				\
slouken@689
   709
    do {								\
slouken@689
   710
        if(alpha == 255) {						\
slouken@689
   711
	    switch(fmt->BytesPerPixel) {				\
slouken@689
   712
	    case 1: blitter(1, Uint8, OPAQUE_BLIT); break;		\
slouken@689
   713
	    case 2: blitter(2, Uint8, OPAQUE_BLIT); break;		\
slouken@689
   714
	    case 3: blitter(3, Uint8, OPAQUE_BLIT); break;		\
slouken@689
   715
	    case 4: blitter(4, Uint16, OPAQUE_BLIT); break;		\
slouken@689
   716
	    }								\
slouken@689
   717
	} else {							\
slouken@689
   718
	    switch(fmt->BytesPerPixel) {				\
slouken@689
   719
	    case 1:							\
slouken@689
   720
		/* No 8bpp alpha blitting */				\
slouken@689
   721
		break;							\
slouken@689
   722
									\
slouken@689
   723
	    case 2:							\
slouken@689
   724
		switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) {		\
slouken@689
   725
		case 0xffff:						\
slouken@689
   726
		    if(fmt->Gmask == 0x07e0				\
slouken@689
   727
		       || fmt->Rmask == 0x07e0				\
slouken@689
   728
		       || fmt->Bmask == 0x07e0) {			\
slouken@689
   729
			if(alpha == 128)				\
slouken@689
   730
			    blitter(2, Uint8, ALPHA_BLIT16_565_50);	\
slouken@689
   731
			else {						\
slouken@0
   732
			    blitter(2, Uint8, ALPHA_BLIT16_565);	\
slouken@0
   733
			}						\
slouken@0
   734
		    } else						\
slouken@0
   735
			goto general16;					\
slouken@0
   736
		    break;						\
slouken@0
   737
									\
slouken@0
   738
		case 0x7fff:						\
slouken@0
   739
		    if(fmt->Gmask == 0x03e0				\
slouken@0
   740
		       || fmt->Rmask == 0x03e0				\
slouken@0
   741
		       || fmt->Bmask == 0x03e0) {			\
slouken@0
   742
			if(alpha == 128)				\
slouken@0
   743
			    blitter(2, Uint8, ALPHA_BLIT16_555_50);	\
slouken@0
   744
			else {						\
slouken@0
   745
			    blitter(2, Uint8, ALPHA_BLIT16_555);	\
slouken@0
   746
			}						\
slouken@0
   747
			break;						\
slouken@0
   748
		    }							\
slouken@0
   749
		    /* fallthrough */					\
slouken@0
   750
									\
slouken@0
   751
		default:						\
slouken@0
   752
		general16:						\
slouken@0
   753
		    blitter(2, Uint8, ALPHA_BLIT_ANY);			\
slouken@0
   754
		}							\
slouken@0
   755
		break;							\
slouken@0
   756
									\
slouken@0
   757
	    case 3:							\
slouken@0
   758
		blitter(3, Uint8, ALPHA_BLIT_ANY);			\
slouken@0
   759
		break;							\
slouken@0
   760
									\
slouken@0
   761
	    case 4:							\
slouken@0
   762
		if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff	\
slouken@0
   763
		   && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00	\
slouken@0
   764
		       || fmt->Bmask == 0xff00)) {			\
slouken@0
   765
		    if(alpha == 128)					\
slouken@0
   766
			blitter(4, Uint16, ALPHA_BLIT32_888_50);	\
slouken@0
   767
		    else						\
slouken@0
   768
			blitter(4, Uint16, ALPHA_BLIT32_888);		\
slouken@0
   769
		} else							\
slouken@0
   770
		    blitter(4, Uint16, ALPHA_BLIT_ANY);			\
slouken@0
   771
		break;							\
slouken@0
   772
	    }								\
slouken@0
   773
	}								\
slouken@0
   774
    } while(0)
slouken@0
   775
slouken@689
   776
#endif
slouken@0
   777
slouken@0
   778
/*
slouken@0
   779
 * This takes care of the case when the surface is clipped on the left and/or
slouken@0
   780
 * right. Top clipping has already been taken care of.
slouken@0
   781
 */
slouken@0
   782
static void RLEClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst,
slouken@0
   783
			Uint8 *dstbuf, SDL_Rect *srcrect, unsigned alpha)
slouken@0
   784
{
slouken@0
   785
    SDL_PixelFormat *fmt = dst->format;
slouken@0
   786
slouken@0
   787
#define RLECLIPBLIT(bpp, Type, do_blit)					   \
slouken@0
   788
    do {								   \
slouken@0
   789
	int linecount = srcrect->h;					   \
slouken@0
   790
	int ofs = 0;							   \
slouken@0
   791
	int left = srcrect->x;						   \
slouken@0
   792
	int right = left + srcrect->w;					   \
slouken@0
   793
	dstbuf -= left * bpp;						   \
slouken@0
   794
	for(;;) {							   \
slouken@0
   795
	    int run;							   \
slouken@0
   796
	    ofs += *(Type *)srcbuf;					   \
slouken@0
   797
	    run = ((Type *)srcbuf)[1];					   \
slouken@0
   798
	    srcbuf += 2 * sizeof(Type);					   \
slouken@0
   799
	    if(run) {							   \
slouken@0
   800
		/* clip to left and right borders */			   \
slouken@0
   801
		if(ofs < right) {					   \
slouken@0
   802
		    int start = 0;					   \
slouken@0
   803
		    int len = run;					   \
slouken@0
   804
		    int startcol;					   \
slouken@0
   805
		    if(left - ofs > 0) {				   \
slouken@0
   806
			start = left - ofs;				   \
slouken@0
   807
			len -= start;					   \
slouken@0
   808
			if(len <= 0)					   \
slouken@0
   809
			    goto nocopy ## bpp ## do_blit;		   \
slouken@0
   810
		    }							   \
slouken@0
   811
		    startcol = ofs + start;				   \
slouken@0
   812
		    if(len > right - startcol)				   \
slouken@0
   813
			len = right - startcol;				   \
slouken@0
   814
		    do_blit(dstbuf + startcol * bpp, srcbuf + start * bpp, \
slouken@0
   815
			    len, bpp, alpha);				   \
slouken@0
   816
		}							   \
slouken@0
   817
	    nocopy ## bpp ## do_blit:					   \
slouken@0
   818
		srcbuf += run * bpp;					   \
slouken@0
   819
		ofs += run;						   \
slouken@0
   820
	    } else if(!ofs)						   \
slouken@0
   821
		break;							   \
slouken@0
   822
	    if(ofs == w) {						   \
slouken@0
   823
		ofs = 0;						   \
slouken@0
   824
		dstbuf += dst->pitch;					   \
slouken@0
   825
		if(!--linecount)					   \
slouken@0
   826
		    break;						   \
slouken@0
   827
	    }								   \
slouken@0
   828
	}								   \
slouken@0
   829
    } while(0)
slouken@0
   830
slouken@0
   831
    CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt);
slouken@0
   832
slouken@0
   833
#undef RLECLIPBLIT
slouken@0
   834
slouken@0
   835
}
slouken@0
   836
slouken@0
   837
slouken@0
   838
/* blit a colorkeyed RLE surface */
slouken@0
   839
int SDL_RLEBlit(SDL_Surface *src, SDL_Rect *srcrect,
slouken@0
   840
		SDL_Surface *dst, SDL_Rect *dstrect)
slouken@0
   841
{
slouken@0
   842
	Uint8 *dstbuf;
slouken@0
   843
	Uint8 *srcbuf;
slouken@0
   844
	int x, y;
slouken@0
   845
	int w = src->w;
slouken@0
   846
	unsigned alpha;
slouken@0
   847
slouken@0
   848
	/* Lock the destination if necessary */
slouken@526
   849
	if ( SDL_MUSTLOCK(dst) ) {
slouken@526
   850
		if ( SDL_LockSurface(dst) < 0 ) {
slouken@0
   851
			return(-1);
slouken@0
   852
		}
slouken@0
   853
	}
slouken@0
   854
slouken@0
   855
	/* Set up the source and destination pointers */
slouken@0
   856
	x = dstrect->x;
slouken@0
   857
	y = dstrect->y;
slouken@526
   858
	dstbuf = (Uint8 *)dst->pixels
slouken@0
   859
	         + y * dst->pitch + x * src->format->BytesPerPixel;
slouken@0
   860
	srcbuf = (Uint8 *)src->map->sw_data->aux_data;
slouken@0
   861
slouken@0
   862
	{
slouken@0
   863
	    /* skip lines at the top if neccessary */
slouken@0
   864
	    int vskip = srcrect->y;
slouken@0
   865
	    int ofs = 0;
slouken@0
   866
	    if(vskip) {
slouken@0
   867
slouken@0
   868
#define RLESKIP(bpp, Type)			\
slouken@0
   869
		for(;;) {			\
slouken@0
   870
		    int run;			\
slouken@0
   871
		    ofs += *(Type *)srcbuf;	\
slouken@0
   872
		    run = ((Type *)srcbuf)[1];	\
slouken@0
   873
		    srcbuf += sizeof(Type) * 2;	\
slouken@0
   874
		    if(run) {			\
slouken@0
   875
			srcbuf += run * bpp;	\
slouken@0
   876
			ofs += run;		\
slouken@0
   877
		    } else if(!ofs)		\
slouken@0
   878
			goto done;		\
slouken@0
   879
		    if(ofs == w) {		\
slouken@0
   880
			ofs = 0;		\
slouken@0
   881
			if(!--vskip)		\
slouken@0
   882
			    break;		\
slouken@0
   883
		    }				\
slouken@0
   884
		}
slouken@0
   885
slouken@0
   886
		switch(src->format->BytesPerPixel) {
slouken@0
   887
		case 1: RLESKIP(1, Uint8); break;
slouken@0
   888
		case 2: RLESKIP(2, Uint8); break;
slouken@0
   889
		case 3: RLESKIP(3, Uint8); break;
slouken@0
   890
		case 4: RLESKIP(4, Uint16); break;
slouken@0
   891
		}
slouken@0
   892
slouken@0
   893
#undef RLESKIP
slouken@0
   894
slouken@0
   895
	    }
slouken@0
   896
	}
slouken@0
   897
slouken@0
   898
	alpha = (src->flags & SDL_SRCALPHA) == SDL_SRCALPHA
slouken@0
   899
	        ? src->format->alpha : 255;
slouken@0
   900
	/* if left or right edge clipping needed, call clip blit */
slouken@0
   901
	if ( srcrect->x || srcrect->w != src->w ) {
slouken@0
   902
	    RLEClipBlit(w, srcbuf, dst, dstbuf, srcrect, alpha);
slouken@0
   903
	} else {
slouken@0
   904
	    SDL_PixelFormat *fmt = src->format;
slouken@0
   905
slouken@0
   906
#define RLEBLIT(bpp, Type, do_blit)					      \
slouken@0
   907
	    do {							      \
slouken@0
   908
		int linecount = srcrect->h;				      \
slouken@0
   909
		int ofs = 0;						      \
slouken@0
   910
		for(;;) {						      \
slouken@0
   911
		    unsigned run;					      \
slouken@0
   912
		    ofs += *(Type *)srcbuf;				      \
slouken@0
   913
		    run = ((Type *)srcbuf)[1];				      \
slouken@0
   914
		    srcbuf += 2 * sizeof(Type);				      \
slouken@0
   915
		    if(run) {						      \
slouken@0
   916
			do_blit(dstbuf + ofs * bpp, srcbuf, run, bpp, alpha); \
slouken@0
   917
			srcbuf += run * bpp;				      \
slouken@0
   918
			ofs += run;					      \
slouken@0
   919
		    } else if(!ofs)					      \
slouken@0
   920
			break;						      \
slouken@0
   921
		    if(ofs == w) {					      \
slouken@0
   922
			ofs = 0;					      \
slouken@0
   923
			dstbuf += dst->pitch;				      \
slouken@0
   924
			if(!--linecount)				      \
slouken@0
   925
			    break;					      \
slouken@0
   926
		    }							      \
slouken@0
   927
		}							      \
slouken@0
   928
	    } while(0)
slouken@0
   929
slouken@0
   930
	    CHOOSE_BLIT(RLEBLIT, alpha, fmt);
slouken@0
   931
slouken@0
   932
#undef RLEBLIT
slouken@0
   933
	}
slouken@0
   934
slouken@0
   935
done:
slouken@0
   936
	/* Unlock the destination if necessary */
slouken@526
   937
	if ( SDL_MUSTLOCK(dst) ) {
slouken@526
   938
		SDL_UnlockSurface(dst);
slouken@0
   939
	}
slouken@0
   940
	return(0);
slouken@0
   941
}
slouken@0
   942
slouken@0
   943
#undef OPAQUE_BLIT
slouken@0
   944
slouken@0
   945
/*
slouken@0
   946
 * Per-pixel blitting macros for translucent pixels:
slouken@0
   947
 * These use the same techniques as the per-surface blitting macros
slouken@0
   948
 */
slouken@0
   949
slouken@0
   950
/*
slouken@0
   951
 * For 32bpp pixels, we have made sure the alpha is stored in the top
slouken@0
   952
 * 8 bits, so proceed as usual
slouken@0
   953
 */
slouken@0
   954
#define BLIT_TRANSL_888(src, dst)				\
slouken@0
   955
    do {							\
slouken@0
   956
        Uint32 s = src;						\
slouken@0
   957
	Uint32 d = dst;						\
slouken@0
   958
	unsigned alpha = s >> 24;				\
slouken@0
   959
	Uint32 s1 = s & 0xff00ff;				\
slouken@0
   960
	Uint32 d1 = d & 0xff00ff;				\
slouken@0
   961
	d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff;	\
slouken@0
   962
	s &= 0xff00;						\
slouken@0
   963
	d &= 0xff00;						\
slouken@0
   964
	d = (d + ((s - d) * alpha >> 8)) & 0xff00;		\
slouken@0
   965
	dst = d1 | d;						\
slouken@0
   966
    } while(0)
slouken@0
   967
slouken@0
   968
/*
slouken@0
   969
 * For 16bpp pixels, we have stored the 5 most significant alpha bits in
slouken@0
   970
 * bits 5-10. As before, we can process all 3 RGB components at the same time.
slouken@0
   971
 */
slouken@0
   972
#define BLIT_TRANSL_565(src, dst)		\
slouken@0
   973
    do {					\
slouken@1428
   974
	Uint32 s = src;				\
slouken@0
   975
	Uint32 d = dst;				\
slouken@0
   976
	unsigned alpha = (s & 0x3e0) >> 5;	\
slouken@0
   977
	s &= 0x07e0f81f;			\
slouken@0
   978
	d = (d | d << 16) & 0x07e0f81f;		\
slouken@0
   979
	d += (s - d) * alpha >> 5;		\
slouken@0
   980
	d &= 0x07e0f81f;			\
slouken@1428
   981
	dst = (Uint16)(d | d >> 16);			\
slouken@0
   982
    } while(0)
slouken@0
   983
slouken@0
   984
#define BLIT_TRANSL_555(src, dst)		\
slouken@0
   985
    do {					\
slouken@1428
   986
	Uint32 s = src;				\
slouken@0
   987
	Uint32 d = dst;				\
slouken@0
   988
	unsigned alpha = (s & 0x3e0) >> 5;	\
slouken@0
   989
	s &= 0x03e07c1f;			\
slouken@0
   990
	d = (d | d << 16) & 0x03e07c1f;		\
slouken@0
   991
	d += (s - d) * alpha >> 5;		\
slouken@0
   992
	d &= 0x03e07c1f;			\
slouken@1428
   993
	dst = (Uint16)(d | d >> 16);			\
slouken@0
   994
    } while(0)
slouken@0
   995
slouken@0
   996
/* used to save the destination format in the encoding. Designed to be
slouken@0
   997
   macro-compatible with SDL_PixelFormat but without the unneeded fields */
slouken@0
   998
typedef struct {
slouken@1428
   999
	Uint8  BytesPerPixel;
slouken@0
  1000
	Uint8  Rloss;
slouken@0
  1001
	Uint8  Gloss;
slouken@0
  1002
	Uint8  Bloss;
slouken@0
  1003
	Uint8  Rshift;
slouken@0
  1004
	Uint8  Gshift;
slouken@0
  1005
	Uint8  Bshift;
slouken@0
  1006
	Uint8  Ashift;
slouken@0
  1007
	Uint32 Rmask;
slouken@0
  1008
	Uint32 Gmask;
slouken@0
  1009
	Uint32 Bmask;
slouken@0
  1010
	Uint32 Amask;
slouken@0
  1011
} RLEDestFormat;
slouken@0
  1012
slouken@0
  1013
/* blit a pixel-alpha RLE surface clipped at the right and/or left edges */
slouken@0
  1014
static void RLEAlphaClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst,
slouken@0
  1015
			     Uint8 *dstbuf, SDL_Rect *srcrect)
slouken@0
  1016
{
slouken@0
  1017
    SDL_PixelFormat *df = dst->format;
slouken@0
  1018
    /*
slouken@0
  1019
     * clipped blitter: Ptype is the destination pixel type,
slouken@0
  1020
     * Ctype the translucent count type, and do_blend the macro
slouken@0
  1021
     * to blend one pixel.
slouken@0
  1022
     */
slouken@0
  1023
#define RLEALPHACLIPBLIT(Ptype, Ctype, do_blend)			  \
slouken@0
  1024
    do {								  \
slouken@0
  1025
	int linecount = srcrect->h;					  \
slouken@0
  1026
	int left = srcrect->x;						  \
slouken@0
  1027
	int right = left + srcrect->w;					  \
slouken@0
  1028
	dstbuf -= left * sizeof(Ptype);					  \
slouken@0
  1029
	do {								  \
slouken@0
  1030
	    int ofs = 0;						  \
slouken@0
  1031
	    /* blit opaque pixels on one line */			  \
slouken@0
  1032
	    do {							  \
slouken@0
  1033
		unsigned run;						  \
slouken@0
  1034
		ofs += ((Ctype *)srcbuf)[0];				  \
slouken@0
  1035
		run = ((Ctype *)srcbuf)[1];				  \
slouken@0
  1036
		srcbuf += 2 * sizeof(Ctype);				  \
slouken@0
  1037
		if(run) {						  \
slouken@0
  1038
		    /* clip to left and right borders */		  \
slouken@0
  1039
		    int cofs = ofs;					  \
slouken@0
  1040
		    int crun = run;					  \
slouken@0
  1041
		    if(left - cofs > 0) {				  \
slouken@0
  1042
			crun -= left - cofs;				  \
slouken@0
  1043
			cofs = left;					  \
slouken@0
  1044
		    }							  \
slouken@0
  1045
		    if(crun > right - cofs)				  \
slouken@0
  1046
			crun = right - cofs;				  \
slouken@0
  1047
		    if(crun > 0)					  \
slouken@1
  1048
			PIXEL_COPY(dstbuf + cofs * sizeof(Ptype),	  \
slouken@0
  1049
				   srcbuf + (cofs - ofs) * sizeof(Ptype), \
slouken@1
  1050
				   (unsigned)crun, sizeof(Ptype));	  \
slouken@0
  1051
		    srcbuf += run * sizeof(Ptype);			  \
slouken@0
  1052
		    ofs += run;						  \
slouken@0
  1053
		} else if(!ofs)						  \
slouken@0
  1054
		    return;						  \
slouken@0
  1055
	    } while(ofs < w);						  \
slouken@0
  1056
	    /* skip padding if necessary */				  \
slouken@0
  1057
	    if(sizeof(Ptype) == 2)					  \
slouken@1456
  1058
		srcbuf += (uintptr_t)srcbuf & 2;			  \
slouken@0
  1059
	    /* blit translucent pixels on the same line */		  \
slouken@0
  1060
	    ofs = 0;							  \
slouken@0
  1061
	    do {							  \
slouken@0
  1062
		unsigned run;						  \
slouken@0
  1063
		ofs += ((Uint16 *)srcbuf)[0];				  \
slouken@0
  1064
		run = ((Uint16 *)srcbuf)[1];				  \
slouken@0
  1065
		srcbuf += 4;						  \
slouken@0
  1066
		if(run) {						  \
slouken@0
  1067
		    /* clip to left and right borders */		  \
slouken@0
  1068
		    int cofs = ofs;					  \
slouken@0
  1069
		    int crun = run;					  \
slouken@0
  1070
		    if(left - cofs > 0) {				  \
slouken@0
  1071
			crun -= left - cofs;				  \
slouken@0
  1072
			cofs = left;					  \
slouken@0
  1073
		    }							  \
slouken@0
  1074
		    if(crun > right - cofs)				  \
slouken@0
  1075
			crun = right - cofs;				  \
slouken@0
  1076
		    if(crun > 0) {					  \
slouken@0
  1077
			Ptype *dst = (Ptype *)dstbuf + cofs;		  \
slouken@0
  1078
			Uint32 *src = (Uint32 *)srcbuf + (cofs - ofs);	  \
slouken@0
  1079
			int i;						  \
slouken@0
  1080
			for(i = 0; i < crun; i++)			  \
slouken@0
  1081
			    do_blend(src[i], dst[i]);			  \
slouken@0
  1082
		    }							  \
slouken@0
  1083
		    srcbuf += run * 4;					  \
slouken@0
  1084
		    ofs += run;						  \
slouken@0
  1085
		}							  \
slouken@0
  1086
	    } while(ofs < w);						  \
slouken@0
  1087
	    dstbuf += dst->pitch;					  \
slouken@0
  1088
	} while(--linecount);						  \
slouken@0
  1089
    } while(0)
slouken@0
  1090
slouken@0
  1091
    switch(df->BytesPerPixel) {
slouken@0
  1092
    case 2:
slouken@0
  1093
	if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0
slouken@0
  1094
	   || df->Bmask == 0x07e0)
slouken@0
  1095
	    RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_565);
slouken@0
  1096
	else
slouken@0
  1097
	    RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_555);
slouken@0
  1098
	break;
slouken@0
  1099
    case 4:
slouken@0
  1100
	RLEALPHACLIPBLIT(Uint32, Uint16, BLIT_TRANSL_888);
slouken@0
  1101
	break;
slouken@0
  1102
    }
slouken@0
  1103
}
slouken@0
  1104
slouken@0
  1105
/* blit a pixel-alpha RLE surface */
slouken@0
  1106
int SDL_RLEAlphaBlit(SDL_Surface *src, SDL_Rect *srcrect,
slouken@0
  1107
		     SDL_Surface *dst, SDL_Rect *dstrect)
slouken@0
  1108
{
slouken@0
  1109
    int x, y;
slouken@0
  1110
    int w = src->w;
slouken@0
  1111
    Uint8 *srcbuf, *dstbuf;
slouken@0
  1112
    SDL_PixelFormat *df = dst->format;
slouken@0
  1113
slouken@0
  1114
    /* Lock the destination if necessary */
slouken@526
  1115
    if ( SDL_MUSTLOCK(dst) ) {
slouken@526
  1116
	if ( SDL_LockSurface(dst) < 0 ) {
slouken@0
  1117
	    return -1;
slouken@0
  1118
	}
slouken@0
  1119
    }
slouken@0
  1120
slouken@0
  1121
    x = dstrect->x;
slouken@0
  1122
    y = dstrect->y;
slouken@526
  1123
    dstbuf = (Uint8 *)dst->pixels
slouken@0
  1124
	     + y * dst->pitch + x * df->BytesPerPixel;
slouken@0
  1125
    srcbuf = (Uint8 *)src->map->sw_data->aux_data + sizeof(RLEDestFormat);
slouken@0
  1126
slouken@0
  1127
    {
slouken@0
  1128
	/* skip lines at the top if necessary */
slouken@0
  1129
	int vskip = srcrect->y;
slouken@0
  1130
	if(vskip) {
slouken@0
  1131
	    int ofs;
slouken@0
  1132
	    if(df->BytesPerPixel == 2) {
slouken@0
  1133
		/* the 16/32 interleaved format */
slouken@0
  1134
		do {
slouken@0
  1135
		    /* skip opaque line */
slouken@0
  1136
		    ofs = 0;
slouken@0
  1137
		    do {
slouken@0
  1138
			int run;
slouken@0
  1139
			ofs += srcbuf[0];
slouken@0
  1140
			run = srcbuf[1];
slouken@0
  1141
			srcbuf += 2;
slouken@0
  1142
			if(run) {
slouken@0
  1143
			    srcbuf += 2 * run;
slouken@0
  1144
			    ofs += run;
slouken@0
  1145
			} else if(!ofs)
slouken@0
  1146
			    goto done;
slouken@0
  1147
		    } while(ofs < w);
slouken@0
  1148
slouken@0
  1149
		    /* skip padding */
slouken@1456
  1150
		    srcbuf += (uintptr_t)srcbuf & 2;
slouken@0
  1151
slouken@0
  1152
		    /* skip translucent line */
slouken@0
  1153
		    ofs = 0;
slouken@0
  1154
		    do {
slouken@0
  1155
			int run;
slouken@0
  1156
			ofs += ((Uint16 *)srcbuf)[0];
slouken@0
  1157
			run = ((Uint16 *)srcbuf)[1];
slouken@0
  1158
			srcbuf += 4 * (run + 1);
slouken@0
  1159
			ofs += run;
slouken@0
  1160
		    } while(ofs < w);
slouken@0
  1161
		} while(--vskip);
slouken@0
  1162
	    } else {
slouken@0
  1163
		/* the 32/32 interleaved format */
slouken@0
  1164
		vskip <<= 1;	/* opaque and translucent have same format */
slouken@0
  1165
		do {
slouken@0
  1166
		    ofs = 0;
slouken@0
  1167
		    do {
slouken@0
  1168
			int run;
slouken@0
  1169
			ofs += ((Uint16 *)srcbuf)[0];
slouken@0
  1170
			run = ((Uint16 *)srcbuf)[1];
slouken@0
  1171
			srcbuf += 4;
slouken@0
  1172
			if(run) {
slouken@0
  1173
			    srcbuf += 4 * run;
slouken@0
  1174
			    ofs += run;
slouken@0
  1175
			} else if(!ofs)
slouken@0
  1176
			    goto done;
slouken@0
  1177
		    } while(ofs < w);
slouken@0
  1178
		} while(--vskip);
slouken@0
  1179
	    }
slouken@0
  1180
	}
slouken@0
  1181
    }
slouken@0
  1182
slouken@0
  1183
    /* if left or right edge clipping needed, call clip blit */
slouken@0
  1184
    if(srcrect->x || srcrect->w != src->w) {
slouken@0
  1185
	RLEAlphaClipBlit(w, srcbuf, dst, dstbuf, srcrect);
slouken@0
  1186
    } else {
slouken@0
  1187
slouken@0
  1188
	/*
slouken@0
  1189
	 * non-clipped blitter. Ptype is the destination pixel type,
slouken@0
  1190
	 * Ctype the translucent count type, and do_blend the
slouken@0
  1191
	 * macro to blend one pixel.
slouken@0
  1192
	 */
slouken@0
  1193
#define RLEALPHABLIT(Ptype, Ctype, do_blend)				 \
slouken@0
  1194
	do {								 \
slouken@0
  1195
	    int linecount = srcrect->h;					 \
slouken@0
  1196
	    do {							 \
slouken@0
  1197
		int ofs = 0;						 \
slouken@0
  1198
		/* blit opaque pixels on one line */			 \
slouken@0
  1199
		do {							 \
slouken@0
  1200
		    unsigned run;					 \
slouken@0
  1201
		    ofs += ((Ctype *)srcbuf)[0];			 \
slouken@0
  1202
		    run = ((Ctype *)srcbuf)[1];				 \
slouken@0
  1203
		    srcbuf += 2 * sizeof(Ctype);			 \
slouken@0
  1204
		    if(run) {						 \
slouken@1
  1205
			PIXEL_COPY(dstbuf + ofs * sizeof(Ptype), srcbuf, \
slouken@1
  1206
				   run, sizeof(Ptype));			 \
slouken@0
  1207
			srcbuf += run * sizeof(Ptype);			 \
slouken@0
  1208
			ofs += run;					 \
slouken@0
  1209
		    } else if(!ofs)					 \
slouken@0
  1210
			goto done;					 \
slouken@0
  1211
		} while(ofs < w);					 \
slouken@0
  1212
		/* skip padding if necessary */				 \
slouken@0
  1213
		if(sizeof(Ptype) == 2)					 \
slouken@1456
  1214
		    srcbuf += (uintptr_t)srcbuf & 2;		 	 \
slouken@0
  1215
		/* blit translucent pixels on the same line */		 \
slouken@0
  1216
		ofs = 0;						 \
slouken@0
  1217
		do {							 \
slouken@0
  1218
		    unsigned run;					 \
slouken@0
  1219
		    ofs += ((Uint16 *)srcbuf)[0];			 \
slouken@0
  1220
		    run = ((Uint16 *)srcbuf)[1];			 \
slouken@0
  1221
		    srcbuf += 4;					 \
slouken@0
  1222
		    if(run) {						 \
slouken@0
  1223
			Ptype *dst = (Ptype *)dstbuf + ofs;		 \
slouken@0
  1224
			unsigned i;					 \
slouken@0
  1225
			for(i = 0; i < run; i++) {			 \
slouken@0
  1226
			    Uint32 src = *(Uint32 *)srcbuf;		 \
slouken@0
  1227
			    do_blend(src, *dst);			 \
slouken@0
  1228
			    srcbuf += 4;				 \
slouken@0
  1229
			    dst++;					 \
slouken@0
  1230
			}						 \
slouken@0
  1231
			ofs += run;					 \
slouken@0
  1232
		    }							 \
slouken@0
  1233
		} while(ofs < w);					 \
slouken@0
  1234
		dstbuf += dst->pitch;					 \
slouken@0
  1235
	    } while(--linecount);					 \
slouken@0
  1236
	} while(0)
slouken@0
  1237
slouken@0
  1238
	switch(df->BytesPerPixel) {
slouken@0
  1239
	case 2:
slouken@0
  1240
	    if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0
slouken@0
  1241
	       || df->Bmask == 0x07e0)
slouken@0
  1242
		RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_565);
slouken@0
  1243
	    else
slouken@0
  1244
		RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_555);
slouken@0
  1245
	    break;
slouken@0
  1246
	case 4:
slouken@0
  1247
	    RLEALPHABLIT(Uint32, Uint16, BLIT_TRANSL_888);
slouken@0
  1248
	    break;
slouken@0
  1249
	}
slouken@0
  1250
    }
slouken@0
  1251
slouken@0
  1252
 done:
slouken@0
  1253
    /* Unlock the destination if necessary */
slouken@526
  1254
    if ( SDL_MUSTLOCK(dst) ) {
slouken@526
  1255
	SDL_UnlockSurface(dst);
slouken@0
  1256
    }
slouken@0
  1257
    return 0;
slouken@0
  1258
}
slouken@0
  1259
slouken@0
  1260
/*
slouken@0
  1261
 * Auxiliary functions:
slouken@0
  1262
 * The encoding functions take 32bpp rgb + a, and
slouken@0
  1263
 * return the number of bytes copied to the destination.
slouken@0
  1264
 * The decoding functions copy to 32bpp rgb + a, and
slouken@0
  1265
 * return the number of bytes copied from the source.
slouken@0
  1266
 * These are only used in the encoder and un-RLE code and are therefore not
slouken@0
  1267
 * highly optimised.
slouken@0
  1268
 */
slouken@0
  1269
slouken@0
  1270
/* encode 32bpp rgb + a into 16bpp rgb, losing alpha */
slouken@0
  1271
static int copy_opaque_16(void *dst, Uint32 *src, int n,
slouken@0
  1272
			  SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt)
slouken@0
  1273
{
slouken@0
  1274
    int i;
slouken@0
  1275
    Uint16 *d = dst;
slouken@0
  1276
    for(i = 0; i < n; i++) {
slouken@0
  1277
	unsigned r, g, b;
slouken@0
  1278
	RGB_FROM_PIXEL(*src, sfmt, r, g, b);
slouken@0
  1279
	PIXEL_FROM_RGB(*d, dfmt, r, g, b);
slouken@0
  1280
	src++;
slouken@0
  1281
	d++;
slouken@0
  1282
    }
slouken@0
  1283
    return n * 2;
slouken@0
  1284
}
slouken@0
  1285
slouken@0
  1286
/* decode opaque pixels from 16bpp to 32bpp rgb + a */
slouken@0
  1287
static int uncopy_opaque_16(Uint32 *dst, void *src, int n,
slouken@0
  1288
			    RLEDestFormat *sfmt, SDL_PixelFormat *dfmt)
slouken@0
  1289
{
slouken@0
  1290
    int i;
slouken@0
  1291
    Uint16 *s = src;
slouken@0
  1292
    unsigned alpha = dfmt->Amask ? 255 : 0;
slouken@0
  1293
    for(i = 0; i < n; i++) {
slouken@0
  1294
	unsigned r, g, b;
slouken@0
  1295
	RGB_FROM_PIXEL(*s, sfmt, r, g, b);
slouken@0
  1296
	PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, alpha);
slouken@0
  1297
	s++;
slouken@0
  1298
	dst++;
slouken@0
  1299
    }
slouken@0
  1300
    return n * 2;
slouken@0
  1301
}
slouken@0
  1302
slouken@0
  1303
slouken@0
  1304
slouken@0
  1305
/* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 565 */
slouken@0
  1306
static int copy_transl_565(void *dst, Uint32 *src, int n,
slouken@0
  1307
			   SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt)
slouken@0
  1308
{
slouken@0
  1309
    int i;
slouken@0
  1310
    Uint32 *d = dst;
slouken@0
  1311
    for(i = 0; i < n; i++) {
slouken@0
  1312
	unsigned r, g, b, a;
slouken@0
  1313
	Uint16 pix;
slouken@0
  1314
	RGBA_FROM_8888(*src, sfmt, r, g, b, a);
slouken@0
  1315
	PIXEL_FROM_RGB(pix, dfmt, r, g, b);
slouken@0
  1316
	*d = ((pix & 0x7e0) << 16) | (pix & 0xf81f) | ((a << 2) & 0x7e0);
slouken@0
  1317
	src++;
slouken@0
  1318
	d++;
slouken@0
  1319
    }
slouken@0
  1320
    return n * 4;
slouken@0
  1321
}
slouken@0
  1322
slouken@0
  1323
/* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 555 */
slouken@0
  1324
static int copy_transl_555(void *dst, Uint32 *src, int n,
slouken@0
  1325
			   SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt)
slouken@0
  1326
{
slouken@0
  1327
    int i;
slouken@0
  1328
    Uint32 *d = dst;
slouken@0
  1329
    for(i = 0; i < n; i++) {
slouken@0
  1330
	unsigned r, g, b, a;
slouken@0
  1331
	Uint16 pix;
slouken@0
  1332
	RGBA_FROM_8888(*src, sfmt, r, g, b, a);
slouken@0
  1333
	PIXEL_FROM_RGB(pix, dfmt, r, g, b);
slouken@0
  1334
	*d = ((pix & 0x3e0) << 16) | (pix & 0xfc1f) | ((a << 2) & 0x3e0);
slouken@0
  1335
	src++;
slouken@0
  1336
	d++;
slouken@0
  1337
    }
slouken@0
  1338
    return n * 4;
slouken@0
  1339
}
slouken@0
  1340
slouken@0
  1341
/* decode translucent pixels from 32bpp GORAB to 32bpp rgb + a */
slouken@0
  1342
static int uncopy_transl_16(Uint32 *dst, void *src, int n,
slouken@0
  1343
			    RLEDestFormat *sfmt, SDL_PixelFormat *dfmt)
slouken@0
  1344
{
slouken@0
  1345
    int i;
slouken@0
  1346
    Uint32 *s = src;
slouken@0
  1347
    for(i = 0; i < n; i++) {
slouken@0
  1348
	unsigned r, g, b, a;
slouken@0
  1349
	Uint32 pix = *s++;
slouken@0
  1350
	a = (pix & 0x3e0) >> 2;
slouken@0
  1351
	pix = (pix & ~0x3e0) | pix >> 16;
slouken@0
  1352
	RGB_FROM_PIXEL(pix, sfmt, r, g, b);
slouken@0
  1353
	PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a);
slouken@0
  1354
	dst++;
slouken@0
  1355
    }
slouken@0
  1356
    return n * 4;
slouken@0
  1357
}
slouken@0
  1358
slouken@0
  1359
/* encode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */
slouken@0
  1360
static int copy_32(void *dst, Uint32 *src, int n,
slouken@0
  1361
		   SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt)
slouken@0
  1362
{
slouken@0
  1363
    int i;
slouken@0
  1364
    Uint32 *d = dst;
slouken@0
  1365
    for(i = 0; i < n; i++) {
slouken@0
  1366
	unsigned r, g, b, a;
slouken@0
  1367
	Uint32 pixel;
slouken@0
  1368
	RGBA_FROM_8888(*src, sfmt, r, g, b, a);
slouken@0
  1369
	PIXEL_FROM_RGB(pixel, dfmt, r, g, b);
slouken@0
  1370
	*d++ = pixel | a << 24;
slouken@0
  1371
	src++;
slouken@0
  1372
    }
slouken@0
  1373
    return n * 4;
slouken@0
  1374
}
slouken@0
  1375
slouken@0
  1376
/* decode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */
slouken@0
  1377
static int uncopy_32(Uint32 *dst, void *src, int n,
slouken@0
  1378
		     RLEDestFormat *sfmt, SDL_PixelFormat *dfmt)
slouken@0
  1379
{
slouken@0
  1380
    int i;
slouken@0
  1381
    Uint32 *s = src;
slouken@0
  1382
    for(i = 0; i < n; i++) {
slouken@0
  1383
	unsigned r, g, b, a;
slouken@0
  1384
	Uint32 pixel = *s++;
slouken@0
  1385
	RGB_FROM_PIXEL(pixel, sfmt, r, g, b);
slouken@0
  1386
	a = pixel >> 24;
slouken@0
  1387
	PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a);
slouken@0
  1388
	dst++;
slouken@0
  1389
    }
slouken@0
  1390
    return n * 4;
slouken@0
  1391
}
slouken@0
  1392
slouken@0
  1393
#define ISOPAQUE(pixel, fmt) ((((pixel) & fmt->Amask) >> fmt->Ashift) == 255)
slouken@0
  1394
slouken@0
  1395
#define ISTRANSL(pixel, fmt)	\
slouken@0
  1396
    ((unsigned)((((pixel) & fmt->Amask) >> fmt->Ashift) - 1U) < 254U)
slouken@0
  1397
slouken@0
  1398
/* convert surface to be quickly alpha-blittable onto dest, if possible */
slouken@0
  1399
static int RLEAlphaSurface(SDL_Surface *surface)
slouken@0
  1400
{
slouken@0
  1401
    SDL_Surface *dest;
slouken@0
  1402
    SDL_PixelFormat *df;
slouken@0
  1403
    int maxsize = 0;
slouken@0
  1404
    int max_opaque_run;
slouken@0
  1405
    int max_transl_run = 65535;
slouken@0
  1406
    unsigned masksum;
slouken@0
  1407
    Uint8 *rlebuf, *dst;
slouken@0
  1408
    int (*copy_opaque)(void *, Uint32 *, int,
slouken@0
  1409
		       SDL_PixelFormat *, SDL_PixelFormat *);
slouken@0
  1410
    int (*copy_transl)(void *, Uint32 *, int,
slouken@0
  1411
		       SDL_PixelFormat *, SDL_PixelFormat *);
slouken@0
  1412
slouken@0
  1413
    dest = surface->map->dst;
slouken@0
  1414
    if(!dest)
slouken@0
  1415
	return -1;
slouken@0
  1416
    df = dest->format;
slouken@0
  1417
    if(surface->format->BitsPerPixel != 32)
slouken@0
  1418
	return -1;		/* only 32bpp source supported */
slouken@0
  1419
slouken@0
  1420
    /* find out whether the destination is one we support,
slouken@0
  1421
       and determine the max size of the encoded result */
slouken@0
  1422
    masksum = df->Rmask | df->Gmask | df->Bmask;
slouken@0
  1423
    switch(df->BytesPerPixel) {
slouken@0
  1424
    case 2:
slouken@0
  1425
	/* 16bpp: only support 565 and 555 formats */
slouken@0
  1426
	switch(masksum) {
slouken@0
  1427
	case 0xffff:
slouken@0
  1428
	    if(df->Gmask == 0x07e0
slouken@0
  1429
	       || df->Rmask == 0x07e0 || df->Bmask == 0x07e0) {
slouken@0
  1430
		copy_opaque = copy_opaque_16;
slouken@0
  1431
		copy_transl = copy_transl_565;
slouken@0
  1432
	    } else
slouken@0
  1433
		return -1;
slouken@0
  1434
	    break;
slouken@0
  1435
	case 0x7fff:
slouken@0
  1436
	    if(df->Gmask == 0x03e0
slouken@0
  1437
	       || df->Rmask == 0x03e0 || df->Bmask == 0x03e0) {
slouken@0
  1438
		copy_opaque = copy_opaque_16;
slouken@0
  1439
		copy_transl = copy_transl_555;
slouken@0
  1440
	    } else
slouken@0
  1441
		return -1;
slouken@0
  1442
	    break;
slouken@0
  1443
	default:
slouken@0
  1444
	    return -1;
slouken@0
  1445
	}
slouken@0
  1446
	max_opaque_run = 255;	/* runs stored as bytes */
slouken@0
  1447
slouken@0
  1448
	/* worst case is alternating opaque and translucent pixels,
slouken@0
  1449
	   with room for alignment padding between lines */
slouken@0
  1450
	maxsize = surface->h * (2 + (4 + 2) * (surface->w + 1)) + 2;
slouken@0
  1451
	break;
slouken@0
  1452
    case 4:
slouken@0
  1453
	if(masksum != 0x00ffffff)
slouken@0
  1454
	    return -1;		/* requires unused high byte */
slouken@0
  1455
	copy_opaque = copy_32;
slouken@0
  1456
	copy_transl = copy_32;
slouken@0
  1457
	max_opaque_run = 255;	/* runs stored as short ints */
slouken@0
  1458
slouken@0
  1459
	/* worst case is alternating opaque and translucent pixels */
slouken@0
  1460
	maxsize = surface->h * 2 * 4 * (surface->w + 1) + 4;
slouken@0
  1461
	break;
slouken@0
  1462
    default:
slouken@0
  1463
	return -1;		/* anything else unsupported right now */
slouken@0
  1464
    }
slouken@0
  1465
slouken@0
  1466
    maxsize += sizeof(RLEDestFormat);
slouken@1336
  1467
    rlebuf = (Uint8 *)SDL_malloc(maxsize);
slouken@0
  1468
    if(!rlebuf) {
slouken@0
  1469
	SDL_OutOfMemory();
slouken@0
  1470
	return -1;
slouken@0
  1471
    }
slouken@0
  1472
    {
slouken@0
  1473
	/* save the destination format so we can undo the encoding later */
slouken@0
  1474
	RLEDestFormat *r = (RLEDestFormat *)rlebuf;
slouken@0
  1475
	r->BytesPerPixel = df->BytesPerPixel;
slouken@0
  1476
	r->Rloss = df->Rloss;
slouken@0
  1477
	r->Gloss = df->Gloss;
slouken@0
  1478
	r->Bloss = df->Bloss;
slouken@0
  1479
	r->Rshift = df->Rshift;
slouken@0
  1480
	r->Gshift = df->Gshift;
slouken@0
  1481
	r->Bshift = df->Bshift;
slouken@0
  1482
	r->Ashift = df->Ashift;
slouken@0
  1483
	r->Rmask = df->Rmask;
slouken@0
  1484
	r->Gmask = df->Gmask;
slouken@0
  1485
	r->Bmask = df->Bmask;
slouken@0
  1486
	r->Amask = df->Amask;
slouken@0
  1487
    }
slouken@0
  1488
    dst = rlebuf + sizeof(RLEDestFormat);
slouken@0
  1489
slouken@0
  1490
    /* Do the actual encoding */
slouken@0
  1491
    {
slouken@0
  1492
	int x, y;
slouken@0
  1493
	int h = surface->h, w = surface->w;
slouken@0
  1494
	SDL_PixelFormat *sf = surface->format;
slouken@526
  1495
	Uint32 *src = (Uint32 *)surface->pixels;
slouken@0
  1496
	Uint8 *lastline = dst;	/* end of last non-blank line */
slouken@0
  1497
slouken@0
  1498
	/* opaque counts are 8 or 16 bits, depending on target depth */
slouken@0
  1499
#define ADD_OPAQUE_COUNTS(n, m)			\
slouken@0
  1500
	if(df->BytesPerPixel == 4) {		\
slouken@0
  1501
	    ((Uint16 *)dst)[0] = n;		\
slouken@0
  1502
	    ((Uint16 *)dst)[1] = m;		\
slouken@0
  1503
	    dst += 4;				\
slouken@0
  1504
	} else {				\
slouken@0
  1505
	    dst[0] = n;				\
slouken@0
  1506
	    dst[1] = m;				\
slouken@0
  1507
	    dst += 2;				\
slouken@0
  1508
	}
slouken@0
  1509
slouken@0
  1510
	/* translucent counts are always 16 bit */
slouken@0
  1511
#define ADD_TRANSL_COUNTS(n, m)		\
slouken@0
  1512
	(((Uint16 *)dst)[0] = n, ((Uint16 *)dst)[1] = m, dst += 4)
slouken@0
  1513
slouken@0
  1514
	for(y = 0; y < h; y++) {
slouken@0
  1515
	    int runstart, skipstart;
slouken@0
  1516
	    int blankline = 0;
slouken@0
  1517
	    /* First encode all opaque pixels of a scan line */
slouken@0
  1518
	    x = 0;
slouken@0
  1519
	    do {
slouken@0
  1520
		int run, skip, len;
slouken@0
  1521
		skipstart = x;
slouken@0
  1522
		while(x < w && !ISOPAQUE(src[x], sf))
slouken@0
  1523
		    x++;
slouken@0
  1524
		runstart = x;
slouken@0
  1525
		while(x < w && ISOPAQUE(src[x], sf))
slouken@0
  1526
		    x++;
slouken@0
  1527
		skip = runstart - skipstart;
slouken@0
  1528
		if(skip == w)
slouken@0
  1529
		    blankline = 1;
slouken@0
  1530
		run = x - runstart;
slouken@0
  1531
		while(skip > max_opaque_run) {
slouken@0
  1532
		    ADD_OPAQUE_COUNTS(max_opaque_run, 0);
slouken@0
  1533
		    skip -= max_opaque_run;
slouken@0
  1534
		}
slouken@0
  1535
		len = MIN(run, max_opaque_run);
slouken@0
  1536
		ADD_OPAQUE_COUNTS(skip, len);
slouken@0
  1537
		dst += copy_opaque(dst, src + runstart, len, sf, df);
slouken@0
  1538
		runstart += len;
slouken@0
  1539
		run -= len;
slouken@0
  1540
		while(run) {
slouken@0
  1541
		    len = MIN(run, max_opaque_run);
slouken@0
  1542
		    ADD_OPAQUE_COUNTS(0, len);
slouken@0
  1543
		    dst += copy_opaque(dst, src + runstart, len, sf, df);
slouken@0
  1544
		    runstart += len;
slouken@0
  1545
		    run -= len;
slouken@0
  1546
		}
slouken@0
  1547
	    } while(x < w);
slouken@0
  1548
slouken@0
  1549
	    /* Make sure the next output address is 32-bit aligned */
slouken@1456
  1550
	    dst += (uintptr_t)dst & 2;
slouken@0
  1551
slouken@0
  1552
	    /* Next, encode all translucent pixels of the same scan line */
slouken@0
  1553
	    x = 0;
slouken@0
  1554
	    do {
slouken@0
  1555
		int run, skip, len;
slouken@0
  1556
		skipstart = x;
slouken@0
  1557
		while(x < w && !ISTRANSL(src[x], sf))
slouken@0
  1558
		    x++;
slouken@0
  1559
		runstart = x;
slouken@0
  1560
		while(x < w && ISTRANSL(src[x], sf))
slouken@0
  1561
		    x++;
slouken@0
  1562
		skip = runstart - skipstart;
slouken@0
  1563
		blankline &= (skip == w);
slouken@0
  1564
		run = x - runstart;
slouken@0
  1565
		while(skip > max_transl_run) {
slouken@0
  1566
		    ADD_TRANSL_COUNTS(max_transl_run, 0);
slouken@0
  1567
		    skip -= max_transl_run;
slouken@0
  1568
		}
slouken@0
  1569
		len = MIN(run, max_transl_run);
slouken@0
  1570
		ADD_TRANSL_COUNTS(skip, len);
slouken@0
  1571
		dst += copy_transl(dst, src + runstart, len, sf, df);
slouken@0
  1572
		runstart += len;
slouken@0
  1573
		run -= len;
slouken@0
  1574
		while(run) {
slouken@0
  1575
		    len = MIN(run, max_transl_run);
slouken@0
  1576
		    ADD_TRANSL_COUNTS(0, len);
slouken@0
  1577
		    dst += copy_transl(dst, src + runstart, len, sf, df);
slouken@0
  1578
		    runstart += len;
slouken@0
  1579
		    run -= len;
slouken@0
  1580
		}
slouken@0
  1581
		if(!blankline)
slouken@0
  1582
		    lastline = dst;
slouken@0
  1583
	    } while(x < w);
slouken@0
  1584
slouken@0
  1585
	    src += surface->pitch >> 2;
slouken@0
  1586
	}
slouken@0
  1587
	dst = lastline;		/* back up past trailing blank lines */
slouken@0
  1588
	ADD_OPAQUE_COUNTS(0, 0);
slouken@0
  1589
    }
slouken@0
  1590
slouken@0
  1591
#undef ADD_OPAQUE_COUNTS
slouken@0
  1592
#undef ADD_TRANSL_COUNTS
slouken@0
  1593
slouken@0
  1594
    /* Now that we have it encoded, release the original pixels */
slouken@0
  1595
    if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC
slouken@0
  1596
       && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) {
slouken@1336
  1597
	SDL_free( surface->pixels );
slouken@0
  1598
	surface->pixels = NULL;
slouken@0
  1599
    }
slouken@0
  1600
slouken@0
  1601
    /* realloc the buffer to release unused memory */
slouken@0
  1602
    {
slouken@1336
  1603
	Uint8 *p = SDL_realloc(rlebuf, dst - rlebuf);
slouken@0
  1604
	if(!p)
slouken@0
  1605
	    p = rlebuf;
slouken@0
  1606
	surface->map->sw_data->aux_data = p;
slouken@0
  1607
    }
slouken@0
  1608
slouken@0
  1609
    return 0;
slouken@0
  1610
}
slouken@0
  1611
slouken@0
  1612
static Uint32 getpix_8(Uint8 *srcbuf)
slouken@0
  1613
{
slouken@0
  1614
    return *srcbuf;
slouken@0
  1615
}
slouken@0
  1616
slouken@0
  1617
static Uint32 getpix_16(Uint8 *srcbuf)
slouken@0
  1618
{
slouken@0
  1619
    return *(Uint16 *)srcbuf;
slouken@0
  1620
}
slouken@0
  1621
slouken@0
  1622
static Uint32 getpix_24(Uint8 *srcbuf)
slouken@0
  1623
{
icculus@1155
  1624
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
icculus@1155
  1625
    return srcbuf[0] + (srcbuf[1] << 8) + (srcbuf[2] << 16);
icculus@1155
  1626
#else
icculus@1155
  1627
    return (srcbuf[0] << 16) + (srcbuf[1] << 8) + srcbuf[2];
icculus@1155
  1628
#endif
slouken@0
  1629
}
slouken@0
  1630
slouken@0
  1631
static Uint32 getpix_32(Uint8 *srcbuf)
slouken@0
  1632
{
slouken@0
  1633
    return *(Uint32 *)srcbuf;
slouken@0
  1634
}
slouken@0
  1635
slouken@0
  1636
typedef Uint32 (*getpix_func)(Uint8 *);
slouken@0
  1637
slouken@0
  1638
static getpix_func getpixes[4] = {
slouken@0
  1639
    getpix_8, getpix_16, getpix_24, getpix_32
slouken@0
  1640
};
slouken@0
  1641
slouken@0
  1642
static int RLEColorkeySurface(SDL_Surface *surface)
slouken@0
  1643
{
slouken@0
  1644
        Uint8 *rlebuf, *dst;
slouken@0
  1645
	int maxn;
slouken@0
  1646
	int y;
slouken@0
  1647
	Uint8 *srcbuf, *curbuf, *lastline;
slouken@0
  1648
	int maxsize = 0;
slouken@0
  1649
	int skip, run;
slouken@0
  1650
	int bpp = surface->format->BytesPerPixel;
slouken@0
  1651
	getpix_func getpix;
slouken@0
  1652
	Uint32 ckey, rgbmask;
slouken@0
  1653
	int w, h;
slouken@0
  1654
slouken@0
  1655
	/* calculate the worst case size for the compressed surface */
slouken@0
  1656
	switch(bpp) {
slouken@0
  1657
	case 1:
slouken@0
  1658
	    /* worst case is alternating opaque and transparent pixels,
slouken@0
  1659
	       starting with an opaque pixel */
slouken@0
  1660
	    maxsize = surface->h * 3 * (surface->w / 2 + 1) + 2;
slouken@0
  1661
	    break;
slouken@0
  1662
	case 2:
slouken@0
  1663
	case 3:
slouken@0
  1664
	    /* worst case is solid runs, at most 255 pixels wide */
slouken@0
  1665
	    maxsize = surface->h * (2 * (surface->w / 255 + 1)
slouken@0
  1666
				    + surface->w * bpp) + 2;
slouken@0
  1667
	    break;
slouken@0
  1668
	case 4:
slouken@0
  1669
	    /* worst case is solid runs, at most 65535 pixels wide */
slouken@0
  1670
	    maxsize = surface->h * (4 * (surface->w / 65535 + 1)
slouken@0
  1671
				    + surface->w * 4) + 4;
slouken@0
  1672
	    break;
slouken@0
  1673
	}
slouken@0
  1674
slouken@1336
  1675
	rlebuf = (Uint8 *)SDL_malloc(maxsize);
slouken@0
  1676
	if ( rlebuf == NULL ) {
slouken@0
  1677
		SDL_OutOfMemory();
slouken@0
  1678
		return(-1);
slouken@0
  1679
	}
slouken@0
  1680
slouken@0
  1681
	/* Set up the conversion */
slouken@526
  1682
	srcbuf = (Uint8 *)surface->pixels;
slouken@0
  1683
	curbuf = srcbuf;
slouken@0
  1684
	maxn = bpp == 4 ? 65535 : 255;
slouken@0
  1685
	skip = run = 0;
slouken@0
  1686
	dst = rlebuf;
slouken@0
  1687
	rgbmask = ~surface->format->Amask;
slouken@0
  1688
	ckey = surface->format->colorkey & rgbmask;
slouken@0
  1689
	lastline = dst;
slouken@0
  1690
	getpix = getpixes[bpp - 1];
slouken@0
  1691
	w = surface->w;
slouken@0
  1692
	h = surface->h;
slouken@0
  1693
slouken@0
  1694
#define ADD_COUNTS(n, m)			\
slouken@0
  1695
	if(bpp == 4) {				\
slouken@0
  1696
	    ((Uint16 *)dst)[0] = n;		\
slouken@0
  1697
	    ((Uint16 *)dst)[1] = m;		\
slouken@0
  1698
	    dst += 4;				\
slouken@0
  1699
	} else {				\
slouken@0
  1700
	    dst[0] = n;				\
slouken@0
  1701
	    dst[1] = m;				\
slouken@0
  1702
	    dst += 2;				\
slouken@0
  1703
	}
slouken@0
  1704
slouken@0
  1705
	for(y = 0; y < h; y++) {
slouken@0
  1706
	    int x = 0;
slouken@0
  1707
	    int blankline = 0;
slouken@0
  1708
	    do {
slouken@0
  1709
		int run, skip, len;
slouken@0
  1710
		int runstart;
slouken@0
  1711
		int skipstart = x;
slouken@0
  1712
slouken@0
  1713
		/* find run of transparent, then opaque pixels */
slouken@0
  1714
		while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) == ckey)
slouken@0
  1715
		    x++;
slouken@0
  1716
		runstart = x;
slouken@0
  1717
		while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) != ckey)
slouken@0
  1718
		    x++;
slouken@0
  1719
		skip = runstart - skipstart;
slouken@0
  1720
		if(skip == w)
slouken@0
  1721
		    blankline = 1;
slouken@0
  1722
		run = x - runstart;
slouken@0
  1723
slouken@0
  1724
		/* encode segment */
slouken@0
  1725
		while(skip > maxn) {
slouken@0
  1726
		    ADD_COUNTS(maxn, 0);
slouken@0
  1727
		    skip -= maxn;
slouken@0
  1728
		}
slouken@0
  1729
		len = MIN(run, maxn);
slouken@0
  1730
		ADD_COUNTS(skip, len);
slouken@1336
  1731
		SDL_memcpy(dst, srcbuf + runstart * bpp, len * bpp);
slouken@0
  1732
		dst += len * bpp;
slouken@0
  1733
		run -= len;
slouken@0
  1734
		runstart += len;
slouken@0
  1735
		while(run) {
slouken@0
  1736
		    len = MIN(run, maxn);
slouken@0
  1737
		    ADD_COUNTS(0, len);
slouken@1336
  1738
		    SDL_memcpy(dst, srcbuf + runstart * bpp, len * bpp);
slouken@0
  1739
		    dst += len * bpp;
slouken@0
  1740
		    runstart += len;
slouken@0
  1741
		    run -= len;
slouken@0
  1742
		}
slouken@0
  1743
		if(!blankline)
slouken@0
  1744
		    lastline = dst;
slouken@0
  1745
	    } while(x < w);
slouken@0
  1746
slouken@0
  1747
	    srcbuf += surface->pitch;
slouken@0
  1748
	}
slouken@0
  1749
	dst = lastline;		/* back up bast trailing blank lines */
slouken@0
  1750
	ADD_COUNTS(0, 0);
slouken@0
  1751
slouken@0
  1752
#undef ADD_COUNTS
slouken@0
  1753
slouken@0
  1754
	/* Now that we have it encoded, release the original pixels */
slouken@0
  1755
	if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC
slouken@0
  1756
	   && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) {
slouken@1336
  1757
	    SDL_free( surface->pixels );
slouken@0
  1758
	    surface->pixels = NULL;
slouken@0
  1759
	}
slouken@0
  1760
slouken@0
  1761
	/* realloc the buffer to release unused memory */
slouken@0
  1762
	{
slouken@0
  1763
	    /* If realloc returns NULL, the original block is left intact */
slouken@1336
  1764
	    Uint8 *p = SDL_realloc(rlebuf, dst - rlebuf);
slouken@0
  1765
	    if(!p)
slouken@0
  1766
		p = rlebuf;
slouken@0
  1767
	    surface->map->sw_data->aux_data = p;
slouken@0
  1768
	}
slouken@0
  1769
slouken@0
  1770
	return(0);
slouken@0
  1771
}
slouken@0
  1772
slouken@0
  1773
int SDL_RLESurface(SDL_Surface *surface)
slouken@0
  1774
{
slouken@0
  1775
	int retcode;
slouken@0
  1776
slouken@0
  1777
	/* Clear any previous RLE conversion */
slouken@0
  1778
	if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
slouken@0
  1779
		SDL_UnRLESurface(surface, 1);
slouken@0
  1780
	}
slouken@0
  1781
slouken@0
  1782
	/* We don't support RLE encoding of bitmaps */
slouken@0
  1783
	if ( surface->format->BitsPerPixel < 8 ) {
slouken@0
  1784
		return(-1);
slouken@0
  1785
	}
slouken@0
  1786
slouken@0
  1787
	/* Lock the surface if it's in hardware */
slouken@526
  1788
	if ( SDL_MUSTLOCK(surface) ) {
slouken@526
  1789
		if ( SDL_LockSurface(surface) < 0 ) {
slouken@0
  1790
			return(-1);
slouken@0
  1791
		}
slouken@0
  1792
	}
slouken@0
  1793
slouken@0
  1794
	/* Encode */
slouken@0
  1795
	if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) {
slouken@0
  1796
	    retcode = RLEColorkeySurface(surface);
slouken@0
  1797
	} else {
slouken@0
  1798
	    if((surface->flags & SDL_SRCALPHA) == SDL_SRCALPHA
slouken@0
  1799
	       && surface->format->Amask != 0)
slouken@0
  1800
		retcode = RLEAlphaSurface(surface);
slouken@0
  1801
	    else
slouken@0
  1802
		retcode = -1;	/* no RLE for per-surface alpha sans ckey */
slouken@0
  1803
	}
slouken@0
  1804
slouken@0
  1805
	/* Unlock the surface if it's in hardware */
slouken@526
  1806
	if ( SDL_MUSTLOCK(surface) ) {
slouken@526
  1807
		SDL_UnlockSurface(surface);
slouken@0
  1808
	}
slouken@0
  1809
slouken@0
  1810
	if(retcode < 0)
slouken@0
  1811
	    return -1;
slouken@0
  1812
slouken@0
  1813
	/* The surface is now accelerated */
slouken@0
  1814
	surface->flags |= SDL_RLEACCEL;
slouken@0
  1815
slouken@0
  1816
	return(0);
slouken@0
  1817
}
slouken@0
  1818
slouken@0
  1819
/*
slouken@0
  1820
 * Un-RLE a surface with pixel alpha
slouken@0
  1821
 * This may not give back exactly the image before RLE-encoding; all
slouken@0
  1822
 * completely transparent pixels will be lost, and colour and alpha depth
slouken@0
  1823
 * may have been reduced (when encoding for 16bpp targets).
slouken@0
  1824
 */
slouken@944
  1825
static SDL_bool UnRLEAlpha(SDL_Surface *surface)
slouken@0
  1826
{
slouken@0
  1827
    Uint8 *srcbuf;
slouken@0
  1828
    Uint32 *dst;
slouken@0
  1829
    SDL_PixelFormat *sf = surface->format;
slouken@0
  1830
    RLEDestFormat *df = surface->map->sw_data->aux_data;
slouken@0
  1831
    int (*uncopy_opaque)(Uint32 *, void *, int,
slouken@0
  1832
			 RLEDestFormat *, SDL_PixelFormat *);
slouken@0
  1833
    int (*uncopy_transl)(Uint32 *, void *, int,
slouken@0
  1834
			 RLEDestFormat *, SDL_PixelFormat *);
slouken@0
  1835
    int w = surface->w;
slouken@0
  1836
    int bpp = df->BytesPerPixel;
slouken@0
  1837
slouken@0
  1838
    if(bpp == 2) {
slouken@0
  1839
	uncopy_opaque = uncopy_opaque_16;
slouken@0
  1840
	uncopy_transl = uncopy_transl_16;
slouken@0
  1841
    } else {
slouken@0
  1842
	uncopy_opaque = uncopy_transl = uncopy_32;
slouken@0
  1843
    }
slouken@0
  1844
slouken@1336
  1845
    surface->pixels = SDL_malloc(surface->h * surface->pitch);
slouken@944
  1846
    if ( !surface->pixels ) {
slouken@944
  1847
        return(SDL_FALSE);
slouken@944
  1848
    }
slouken@0
  1849
    /* fill background with transparent pixels */
slouken@1336
  1850
    SDL_memset(surface->pixels, 0, surface->h * surface->pitch);
slouken@0
  1851
slouken@0
  1852
    dst = surface->pixels;
slouken@0
  1853
    srcbuf = (Uint8 *)(df + 1);
slouken@0
  1854
    for(;;) {
slouken@0
  1855
	/* copy opaque pixels */
slouken@0
  1856
	int ofs = 0;
slouken@0
  1857
	do {
slouken@0
  1858
	    unsigned run;
slouken@0
  1859
	    if(bpp == 2) {
slouken@0
  1860
		ofs += srcbuf[0];
slouken@0
  1861
		run = srcbuf[1];
slouken@0
  1862
		srcbuf += 2;
slouken@0
  1863
	    } else {
slouken@0
  1864
		ofs += ((Uint16 *)srcbuf)[0];
slouken@0
  1865
		run = ((Uint16 *)srcbuf)[1];
slouken@0
  1866
		srcbuf += 4;
slouken@0
  1867
	    }
slouken@0
  1868
	    if(run) {
slouken@0
  1869
		srcbuf += uncopy_opaque(dst + ofs, srcbuf, run, df, sf);
slouken@0
  1870
		ofs += run;
slouken@0
  1871
	    } else if(!ofs)
slouken@944
  1872
		return(SDL_TRUE);
slouken@0
  1873
	} while(ofs < w);
slouken@0
  1874
slouken@0
  1875
	/* skip padding if needed */
slouken@0
  1876
	if(bpp == 2)
slouken@1456
  1877
	    srcbuf += (uintptr_t)srcbuf & 2;
slouken@0
  1878
	
slouken@0
  1879
	/* copy translucent pixels */
slouken@0
  1880
	ofs = 0;
slouken@0
  1881
	do {
slouken@0
  1882
	    unsigned run;
slouken@0
  1883
	    ofs += ((Uint16 *)srcbuf)[0];
slouken@0
  1884
	    run = ((Uint16 *)srcbuf)[1];
slouken@0
  1885
	    srcbuf += 4;
slouken@0
  1886
	    if(run) {
slouken@0
  1887
		srcbuf += uncopy_transl(dst + ofs, srcbuf, run, df, sf);
slouken@0
  1888
		ofs += run;
slouken@0
  1889
	    }
slouken@0
  1890
	} while(ofs < w);
slouken@0
  1891
	dst += surface->pitch >> 2;
slouken@0
  1892
    }
slouken@944
  1893
    /* Make the compiler happy */
slouken@944
  1894
    return(SDL_TRUE);
slouken@0
  1895
}
slouken@0
  1896
slouken@0
  1897
void SDL_UnRLESurface(SDL_Surface *surface, int recode)
slouken@0
  1898
{
slouken@0
  1899
    if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
slouken@0
  1900
	surface->flags &= ~SDL_RLEACCEL;
slouken@0
  1901
slouken@0
  1902
	if(recode && (surface->flags & SDL_PREALLOC) != SDL_PREALLOC
slouken@0
  1903
	   && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) {
slouken@0
  1904
	    if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) {
slouken@0
  1905
		SDL_Rect full;
slouken@0
  1906
		unsigned alpha_flag;
slouken@0
  1907
slouken@0
  1908
		/* re-create the original surface */
slouken@1336
  1909
		surface->pixels = SDL_malloc(surface->h * surface->pitch);
slouken@944
  1910
		if ( !surface->pixels ) {
slouken@944
  1911
			/* Oh crap... */
slouken@944
  1912
			surface->flags |= SDL_RLEACCEL;
slouken@944
  1913
			return;
slouken@944
  1914
		}
slouken@0
  1915
slouken@0
  1916
		/* fill it with the background colour */
slouken@0
  1917
		SDL_FillRect(surface, NULL, surface->format->colorkey);
slouken@0
  1918
slouken@0
  1919
		/* now render the encoded surface */
slouken@0
  1920
		full.x = full.y = 0;
slouken@0
  1921
		full.w = surface->w;
slouken@0
  1922
		full.h = surface->h;
slouken@0
  1923
		alpha_flag = surface->flags & SDL_SRCALPHA;
slouken@0
  1924
		surface->flags &= ~SDL_SRCALPHA; /* opaque blit */
slouken@0
  1925
		SDL_RLEBlit(surface, &full, surface, &full);
slouken@0
  1926
		surface->flags |= alpha_flag;
slouken@944
  1927
	    } else {
slouken@944
  1928
		if ( !UnRLEAlpha(surface) ) {
slouken@944
  1929
		    /* Oh crap... */
slouken@944
  1930
		    surface->flags |= SDL_RLEACCEL;
slouken@944
  1931
		    return;
slouken@944
  1932
		}
slouken@944
  1933
	    }
slouken@0
  1934
	}
slouken@0
  1935
slouken@0
  1936
	if ( surface->map && surface->map->sw_data->aux_data ) {
slouken@1336
  1937
	    SDL_free(surface->map->sw_data->aux_data);
slouken@0
  1938
	    surface->map->sw_data->aux_data = NULL;
slouken@0
  1939
	}
slouken@0
  1940
    }
slouken@0
  1941
}
slouken@0
  1942
slouken@0
  1943