src/video/SDL_RLEaccel.c
author Sam Lantinga
Sat, 02 Jan 2016 10:10:34 -0800
changeset 9998 f67cf37e9cd4
parent 9761 fd7fe355f173
child 10000 acd714e378f4
permissions -rw-r--r--
Updated copyright to 2016
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../SDL_internal.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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#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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    SDL_memcpy(to, from, (size_t)(len) * (bpp))
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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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/*
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 * For 32bpp pixels on the form 0x00rrggbb:
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 * If we treat the middle component separately, we can process the two
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 * remaining in parallel. This is safe to do because of the gap to the left
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 * of each component, so the bits from the multiplication don't collide.
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 * This can be used for any RGB permutation of course.
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 */
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#define ALPHA_BLIT32_888(to, from, length, bpp, alpha)      \
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    do {                                                    \
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        int i;                                              \
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        Uint32 *src = (Uint32 *)(from);                     \
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        Uint32 *dst = (Uint32 *)(to);                       \
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        for (i = 0; i < (int)(length); i++) {               \
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            Uint32 s = *src++;                              \
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            Uint32 d = *dst;                                \
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            Uint32 s1 = s & 0xff00ff;                       \
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            Uint32 d1 = d & 0xff00ff;                       \
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            d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \
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            s &= 0xff00;                                    \
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            d &= 0xff00;                                    \
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            d = (d + ((s - d) * alpha >> 8)) & 0xff00;      \
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            *dst++ = d1 | d;                                \
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        }                                                   \
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    } while (0)
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/*
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 * For 16bpp pixels we can go a step further: put the middle component
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 * in the high 16 bits of a 32 bit word, and process all three RGB
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 * components at the same time. Since the smallest gap is here just
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 * 5 bits, we have to scale alpha down to 5 bits as well.
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 */
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#define ALPHA_BLIT16_565(to, from, length, bpp, alpha)  \
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    do {                                                \
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        int i;                                          \
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        Uint16 *src = (Uint16 *)(from);                 \
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        Uint16 *dst = (Uint16 *)(to);                   \
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        Uint32 ALPHA = alpha >> 3;                      \
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        for(i = 0; i < (int)(length); i++) {            \
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            Uint32 s = *src++;                          \
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            Uint32 d = *dst;                            \
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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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            *dst++ = (Uint16)(d | d >> 16);             \
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        }                                               \
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    } while(0)
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#define ALPHA_BLIT16_555(to, from, length, bpp, alpha)  \
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    do {                                                \
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        int i;                                          \
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        Uint16 *src = (Uint16 *)(from);                 \
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        Uint16 *dst = (Uint16 *)(to);                   \
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        Uint32 ALPHA = alpha >> 3;                      \
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        for(i = 0; i < (int)(length); i++) {            \
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            Uint32 s = *src++;                          \
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            Uint32 d = *dst;                            \
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            s = (s | s << 16) & 0x03e07c1f;             \
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            d = (d | d << 16) & 0x03e07c1f;             \
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            d += (s - d) * ALPHA >> 5;                  \
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            d &= 0x03e07c1f;                            \
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            *dst++ = (Uint16)(d | d >> 16);             \
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        }                                               \
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    } while(0)
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/*
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 * The general slow catch-all function, for remaining depths and formats
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 */
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#define ALPHA_BLIT_ANY(to, from, length, bpp, alpha)            \
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    do {                                                        \
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        int i;                                                  \
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        Uint8 *src = from;                                      \
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        Uint8 *dst = to;                                        \
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        for (i = 0; i < (int)(length); i++) {                   \
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            Uint32 s, d;                                        \
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            unsigned rs, gs, bs, rd, gd, bd;                    \
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            switch (bpp) {                                      \
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            case 2:                                             \
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                s = *(Uint16 *)src;                             \
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                d = *(Uint16 *)dst;                             \
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                break;                                          \
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            case 3:                                             \
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                if (SDL_BYTEORDER == SDL_BIG_ENDIAN) {          \
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                    s = (src[0] << 16) | (src[1] << 8) | src[2]; \
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                    d = (dst[0] << 16) | (dst[1] << 8) | dst[2]; \
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                } else {                                        \
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                    s = (src[2] << 16) | (src[1] << 8) | src[0]; \
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                    d = (dst[2] << 16) | (dst[1] << 8) | dst[0]; \
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                }                                               \
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                break;                                          \
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            case 4:                                             \
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                s = *(Uint32 *)src;                             \
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                d = *(Uint32 *)dst;                             \
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                break;                                          \
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            }                                                   \
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            RGB_FROM_PIXEL(s, fmt, rs, gs, bs);                 \
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            RGB_FROM_PIXEL(d, fmt, rd, gd, bd);                 \
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            rd += (rs - rd) * alpha >> 8;                       \
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            gd += (gs - gd) * alpha >> 8;                       \
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            bd += (bs - bd) * alpha >> 8;                       \
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            PIXEL_FROM_RGB(d, fmt, rd, gd, bd);                 \
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            switch (bpp) {                                      \
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            case 2:                                             \
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                *(Uint16 *)dst = (Uint16)d;                     \
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                break;                                          \
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            case 3:                                             \
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                if (SDL_BYTEORDER == SDL_BIG_ENDIAN) {          \
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                    dst[0] = (Uint8)(d >> 16);                  \
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                    dst[1] = (Uint8)(d >> 8);                   \
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                    dst[2] = (Uint8)(d);                        \
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                } else {                                        \
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                    dst[0] = (Uint8)d;                          \
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                    dst[1] = (Uint8)(d >> 8);                   \
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                    dst[2] = (Uint8)(d >> 16);                  \
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                }                                               \
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                break;                                          \
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            case 4:                                             \
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                *(Uint32 *)dst = d;                             \
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                break;                                          \
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            }                                                   \
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            src += bpp;                                         \
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            dst += bpp;                                         \
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        }                                                       \
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    } while(0)
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/*
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 * Special case: 50% alpha (alpha=128)
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 * This is treated specially because it can be optimized very well, and
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 * since it is good for many cases of semi-translucency.
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 * The theory is to do all three components at the same time:
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 * First zero the lowest bit of each component, which gives us room to
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 * add them. Then shift right and add the sum of the lowest bits.
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 */
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#define ALPHA_BLIT32_888_50(to, from, length, bpp, alpha)       \
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    do {                                                        \
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        int i;                                                  \
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        Uint32 *src = (Uint32 *)(from);                         \
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        Uint32 *dst = (Uint32 *)(to);                           \
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        for(i = 0; i < (int)(length); i++) {                    \
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            Uint32 s = *src++;                                  \
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            Uint32 d = *dst;                                    \
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            *dst++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) \
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                 + (s & d & 0x00010101);                        \
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        }                                                       \
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    } while(0)
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/*
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 * For 16bpp, we can actually blend two pixels in parallel, if we take
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 * care to shift before we add, not after.
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 */
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/* helper: blend a single 16 bit pixel at 50% */
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#define BLEND16_50(dst, src, mask)                              \
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    do {                                                        \
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        Uint32 s = *src++;                                      \
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        Uint32 d = *dst;                                        \
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        *dst++ = (Uint16)((((s & mask) + (d & mask)) >> 1) +    \
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                          (s & d & (~mask & 0xffff)));          \
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    } while(0)
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/* basic 16bpp blender. mask is the pixels to keep when adding. */
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#define ALPHA_BLIT16_50(to, from, length, bpp, alpha, mask)     \
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    do {                                                        \
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        unsigned n = (length);                                  \
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        Uint16 *src = (Uint16 *)(from);                         \
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        Uint16 *dst = (Uint16 *)(to);                           \
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        if (((uintptr_t)src ^ (uintptr_t)dst) & 3) {            \
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            /* source and destination not in phase, blit one by one */ \
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            while (n--)                                         \
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                BLEND16_50(dst, src, mask);                     \
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        } else {                                                \
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            if ((uintptr_t)src & 3) {                           \
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                /* first odd pixel */                           \
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                BLEND16_50(dst, src, mask);                     \
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                n--;                                            \
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            }                                                   \
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            for (; n > 1; n -= 2) {                             \
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                Uint32 s = *(Uint32 *)src;                      \
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                Uint32 d = *(Uint32 *)dst;                      \
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                *(Uint32 *)dst = ((s & (mask | mask << 16)) >> 1) \
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                    + ((d & (mask | mask << 16)) >> 1)          \
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                    + (s & d & (~(mask | mask << 16)));         \
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                src += 2;                                       \
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                dst += 2;                                       \
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            }                                                   \
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            if (n)                                              \
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                BLEND16_50(dst, src, mask); /* last odd pixel */ \
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        }                                                       \
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    } while(0)
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#define ALPHA_BLIT16_565_50(to, from, length, bpp, alpha)       \
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    ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xf7de)
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#define ALPHA_BLIT16_555_50(to, from, length, bpp, alpha)       \
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    ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xfbde)
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#define CHOOSE_BLIT(blitter, alpha, fmt)                        \
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    do {                                                        \
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        if (alpha == 255) {                                     \
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            switch (fmt->BytesPerPixel) {                       \
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            case 1: blitter(1, Uint8, OPAQUE_BLIT); break;      \
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            case 2: blitter(2, Uint8, OPAQUE_BLIT); break;      \
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            case 3: blitter(3, Uint8, OPAQUE_BLIT); break;      \
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            case 4: blitter(4, Uint16, OPAQUE_BLIT); break;     \
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            }                                                   \
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        } else {                                                \
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            switch (fmt->BytesPerPixel) {                       \
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            case 1:                                             \
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                /* No 8bpp alpha blitting */                    \
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                break;                                          \
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                                                                \
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            case 2:                                             \
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                switch (fmt->Rmask | fmt->Gmask | fmt->Bmask) { \
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                case 0xffff:                                    \
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                    if (fmt->Gmask == 0x07e0                    \
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                        || fmt->Rmask == 0x07e0                 \
slouken@8924
   326
                        || fmt->Bmask == 0x07e0) {              \
slouken@8924
   327
                        if (alpha == 128) {                     \
slouken@8924
   328
                            blitter(2, Uint8, ALPHA_BLIT16_565_50); \
slouken@8924
   329
                        } else {                                \
slouken@8924
   330
                            blitter(2, Uint8, ALPHA_BLIT16_565); \
slouken@8924
   331
                        }                                       \
slouken@8924
   332
                    } else                                      \
slouken@8924
   333
                        goto general16;                         \
slouken@8924
   334
                    break;                                      \
slouken@8924
   335
                                                                \
slouken@8924
   336
                case 0x7fff:                                    \
slouken@8924
   337
                    if (fmt->Gmask == 0x03e0                    \
slouken@8924
   338
                        || fmt->Rmask == 0x03e0                 \
slouken@8924
   339
                        || fmt->Bmask == 0x03e0) {              \
slouken@8924
   340
                        if (alpha == 128) {                     \
slouken@8924
   341
                            blitter(2, Uint8, ALPHA_BLIT16_555_50); \
slouken@8924
   342
                        } else {                                \
slouken@8924
   343
                            blitter(2, Uint8, ALPHA_BLIT16_555); \
slouken@8924
   344
                        }                                       \
slouken@8924
   345
                        break;                                  \
slouken@8924
   346
                    } else                                      \
slouken@8924
   347
                        goto general16;                         \
slouken@8924
   348
                    break;                                      \
slouken@8924
   349
                                                                \
slouken@8924
   350
                default:                                        \
slouken@8924
   351
    general16:                                                  \
slouken@8924
   352
                    blitter(2, Uint8, ALPHA_BLIT_ANY);          \
slouken@8924
   353
                }                                               \
slouken@8924
   354
                break;                                          \
slouken@8924
   355
                                                                \
slouken@8924
   356
            case 3:                                             \
slouken@8924
   357
                blitter(3, Uint8, ALPHA_BLIT_ANY);              \
slouken@8924
   358
                break;                                          \
slouken@8924
   359
                                                                \
slouken@8924
   360
            case 4:                                             \
slouken@8924
   361
                if ((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \
slouken@8924
   362
                    && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \
slouken@8924
   363
                    || fmt->Bmask == 0xff00)) {                 \
slouken@8924
   364
                    if (alpha == 128) {                         \
slouken@8924
   365
                        blitter(4, Uint16, ALPHA_BLIT32_888_50); \
slouken@8924
   366
                    } else {                                    \
slouken@8924
   367
                        blitter(4, Uint16, ALPHA_BLIT32_888);   \
slouken@8924
   368
                    }                                           \
slouken@8924
   369
                } else                                          \
slouken@8924
   370
                    blitter(4, Uint16, ALPHA_BLIT_ANY);         \
slouken@8924
   371
                break;                                          \
slouken@8924
   372
            }                                                   \
slouken@8924
   373
        }                                                       \
slouken@0
   374
    } while(0)
slouken@0
   375
slouken@0
   376
/*
slouken@9761
   377
 * Set a pixel value using the given format, except that the alpha value is
slouken@9761
   378
 * placed in the top byte. This is the format used for RLE with alpha.
slouken@9761
   379
 */
slouken@9761
   380
#define RLEPIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a)                      \
slouken@9761
   381
{                                                                       \
slouken@9761
   382
    Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)|                             \
slouken@9761
   383
        ((g>>fmt->Gloss)<<fmt->Gshift)|                                 \
slouken@9761
   384
        ((b>>fmt->Bloss)<<fmt->Bshift)|                                 \
slouken@9761
   385
        (a<<24);                                                        \
slouken@9761
   386
}
slouken@9761
   387
slouken@9761
   388
/*
slouken@0
   389
 * This takes care of the case when the surface is clipped on the left and/or
slouken@0
   390
 * right. Top clipping has already been taken care of.
slouken@0
   391
 */
slouken@1895
   392
static void
slouken@8922
   393
RLEClipBlit(int w, Uint8 * srcbuf, SDL_Surface * surf_dst,
slouken@1895
   394
            Uint8 * dstbuf, SDL_Rect * srcrect, unsigned alpha)
slouken@0
   395
{
slouken@8922
   396
    SDL_PixelFormat *fmt = surf_dst->format;
slouken@0
   397
slouken@8924
   398
#define RLECLIPBLIT(bpp, Type, do_blit)                         \
slouken@8924
   399
    do {                                                        \
slouken@8924
   400
        int linecount = srcrect->h;                             \
slouken@8924
   401
        int ofs = 0;                                            \
slouken@8924
   402
        int left = srcrect->x;                                  \
slouken@8924
   403
        int right = left + srcrect->w;                          \
slouken@8924
   404
        dstbuf -= left * bpp;                                   \
slouken@8924
   405
        for (;;) {                                              \
slouken@8924
   406
            int run;                                            \
slouken@8924
   407
            ofs += *(Type *)srcbuf;                             \
slouken@8924
   408
            run = ((Type *)srcbuf)[1];                          \
slouken@8924
   409
            srcbuf += 2 * sizeof(Type);                         \
slouken@8924
   410
            if (run) {                                          \
slouken@8924
   411
                /* clip to left and right borders */            \
slouken@8924
   412
                if (ofs < right) {                              \
slouken@8924
   413
                    int start = 0;                              \
slouken@8924
   414
                    int len = run;                              \
slouken@8924
   415
                    int startcol;                               \
slouken@8924
   416
                    if (left - ofs > 0) {                       \
slouken@8924
   417
                        start = left - ofs;                     \
slouken@8924
   418
                        len -= start;                           \
slouken@8924
   419
                        if (len <= 0)                           \
slouken@8924
   420
                            goto nocopy ## bpp ## do_blit;      \
slouken@8924
   421
                    }                                           \
slouken@8924
   422
                    startcol = ofs + start;                     \
slouken@8924
   423
                    if (len > right - startcol)                 \
slouken@8924
   424
                        len = right - startcol;                 \
slouken@8924
   425
                    do_blit(dstbuf + startcol * bpp, srcbuf + start * bpp, \
slouken@8924
   426
                        len, bpp, alpha);                       \
slouken@8924
   427
                }                                               \
slouken@8924
   428
    nocopy ## bpp ## do_blit:                                   \
slouken@8924
   429
                srcbuf += run * bpp;                            \
slouken@8924
   430
                ofs += run;                                     \
slouken@8924
   431
            } else if (!ofs)                                    \
slouken@8924
   432
                break;                                          \
slouken@8924
   433
                                                                \
slouken@8924
   434
            if (ofs == w) {                                     \
slouken@8924
   435
                ofs = 0;                                        \
slouken@8924
   436
                dstbuf += surf_dst->pitch;                      \
slouken@8924
   437
                if (!--linecount)                               \
slouken@8924
   438
                    break;                                      \
slouken@8924
   439
            }                                                   \
slouken@8924
   440
        }                                                       \
slouken@0
   441
    } while(0)
slouken@0
   442
slouken@0
   443
    CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt);
slouken@0
   444
slouken@0
   445
#undef RLECLIPBLIT
slouken@0
   446
slouken@0
   447
}
slouken@0
   448
slouken@0
   449
slouken@0
   450
/* blit a colorkeyed RLE surface */
slouken@1895
   451
int
slouken@8922
   452
SDL_RLEBlit(SDL_Surface * surf_src, SDL_Rect * srcrect,
slouken@8922
   453
            SDL_Surface * surf_dst, SDL_Rect * dstrect)
slouken@0
   454
{
slouken@1895
   455
    Uint8 *dstbuf;
slouken@1895
   456
    Uint8 *srcbuf;
slouken@1895
   457
    int x, y;
slouken@8922
   458
    int w = surf_src->w;
slouken@1895
   459
    unsigned alpha;
slouken@0
   460
slouken@1895
   461
    /* Lock the destination if necessary */
slouken@8922
   462
    if (SDL_MUSTLOCK(surf_dst)) {
slouken@8922
   463
        if (SDL_LockSurface(surf_dst) < 0) {
slouken@1895
   464
            return (-1);
slouken@1895
   465
        }
slouken@1895
   466
    }
slouken@0
   467
slouken@1895
   468
    /* Set up the source and destination pointers */
slouken@1895
   469
    x = dstrect->x;
slouken@1895
   470
    y = dstrect->y;
slouken@8922
   471
    dstbuf = (Uint8 *) surf_dst->pixels
slouken@8922
   472
        + y * surf_dst->pitch + x * surf_src->format->BytesPerPixel;
slouken@8922
   473
    srcbuf = (Uint8 *) surf_src->map->data;
slouken@0
   474
slouken@1895
   475
    {
philipp@7128
   476
        /* skip lines at the top if necessary */
slouken@1895
   477
        int vskip = srcrect->y;
slouken@1895
   478
        int ofs = 0;
slouken@1895
   479
        if (vskip) {
slouken@0
   480
slouken@7191
   481
#define RLESKIP(bpp, Type)          \
slouken@7191
   482
        for(;;) {           \
slouken@7191
   483
            int run;            \
slouken@7191
   484
            ofs += *(Type *)srcbuf; \
slouken@7191
   485
            run = ((Type *)srcbuf)[1];  \
slouken@7191
   486
            srcbuf += sizeof(Type) * 2; \
slouken@7191
   487
            if(run) {           \
slouken@7191
   488
            srcbuf += run * bpp;    \
slouken@7191
   489
            ofs += run;     \
slouken@7191
   490
            } else if(!ofs)     \
slouken@7191
   491
            goto done;      \
slouken@7191
   492
            if(ofs == w) {      \
slouken@7191
   493
            ofs = 0;        \
slouken@7191
   494
            if(!--vskip)        \
slouken@7191
   495
                break;      \
slouken@7191
   496
            }               \
slouken@7191
   497
        }
slouken@0
   498
slouken@8922
   499
            switch (surf_src->format->BytesPerPixel) {
slouken@1895
   500
            case 1:
slouken@1895
   501
                RLESKIP(1, Uint8);
slouken@1895
   502
                break;
slouken@1895
   503
            case 2:
slouken@1895
   504
                RLESKIP(2, Uint8);
slouken@1895
   505
                break;
slouken@1895
   506
            case 3:
slouken@1895
   507
                RLESKIP(3, Uint8);
slouken@1895
   508
                break;
slouken@1895
   509
            case 4:
slouken@1895
   510
                RLESKIP(4, Uint16);
slouken@1895
   511
                break;
slouken@1895
   512
            }
slouken@0
   513
slouken@0
   514
#undef RLESKIP
slouken@0
   515
slouken@1895
   516
        }
slouken@1895
   517
    }
slouken@0
   518
slouken@8922
   519
    alpha = surf_src->map->info.a;
slouken@1895
   520
    /* if left or right edge clipping needed, call clip blit */
slouken@8922
   521
    if (srcrect->x || srcrect->w != surf_src->w) {
slouken@8922
   522
        RLEClipBlit(w, srcbuf, surf_dst, dstbuf, srcrect, alpha);
slouken@1895
   523
    } else {
slouken@8922
   524
        SDL_PixelFormat *fmt = surf_src->format;
slouken@0
   525
slouken@7191
   526
#define RLEBLIT(bpp, Type, do_blit)                       \
slouken@7191
   527
        do {                                  \
slouken@7191
   528
        int linecount = srcrect->h;                   \
slouken@7191
   529
        int ofs = 0;                              \
slouken@7191
   530
        for(;;) {                             \
slouken@7191
   531
            unsigned run;                         \
slouken@7191
   532
            ofs += *(Type *)srcbuf;                   \
slouken@7191
   533
            run = ((Type *)srcbuf)[1];                    \
slouken@7191
   534
            srcbuf += 2 * sizeof(Type);                   \
slouken@7191
   535
            if(run) {                             \
slouken@7191
   536
            do_blit(dstbuf + ofs * bpp, srcbuf, run, bpp, alpha); \
slouken@7191
   537
            srcbuf += run * bpp;                      \
slouken@7191
   538
            ofs += run;                       \
slouken@7191
   539
            } else if(!ofs)                       \
slouken@7191
   540
            break;                            \
slouken@7191
   541
            if(ofs == w) {                        \
slouken@7191
   542
            ofs = 0;                          \
slouken@8922
   543
            dstbuf += surf_dst->pitch;                     \
slouken@7191
   544
            if(!--linecount)                      \
slouken@7191
   545
                break;                        \
slouken@7191
   546
            }                                 \
slouken@7191
   547
        }                                 \
slouken@7191
   548
        } while(0)
slouken@0
   549
slouken@1895
   550
        CHOOSE_BLIT(RLEBLIT, alpha, fmt);
slouken@0
   551
slouken@0
   552
#undef RLEBLIT
slouken@1895
   553
    }
slouken@0
   554
slouken@1895
   555
  done:
slouken@1895
   556
    /* Unlock the destination if necessary */
slouken@8922
   557
    if (SDL_MUSTLOCK(surf_dst)) {
slouken@8922
   558
        SDL_UnlockSurface(surf_dst);
slouken@1895
   559
    }
slouken@1895
   560
    return (0);
slouken@0
   561
}
slouken@0
   562
slouken@0
   563
#undef OPAQUE_BLIT
slouken@0
   564
slouken@0
   565
/*
slouken@0
   566
 * Per-pixel blitting macros for translucent pixels:
slouken@0
   567
 * These use the same techniques as the per-surface blitting macros
slouken@0
   568
 */
slouken@0
   569
slouken@0
   570
/*
slouken@0
   571
 * For 32bpp pixels, we have made sure the alpha is stored in the top
slouken@0
   572
 * 8 bits, so proceed as usual
slouken@0
   573
 */
slouken@7191
   574
#define BLIT_TRANSL_888(src, dst)               \
slouken@7191
   575
    do {                            \
slouken@7191
   576
        Uint32 s = src;                     \
slouken@7191
   577
    Uint32 d = dst;                     \
slouken@7191
   578
    unsigned alpha = s >> 24;               \
slouken@7191
   579
    Uint32 s1 = s & 0xff00ff;               \
slouken@7191
   580
    Uint32 d1 = d & 0xff00ff;               \
slouken@7191
   581
    d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff;    \
slouken@7191
   582
    s &= 0xff00;                        \
slouken@7191
   583
    d &= 0xff00;                        \
slouken@7191
   584
    d = (d + ((s - d) * alpha >> 8)) & 0xff00;      \
slouken@7191
   585
    dst = d1 | d | 0xff000000;              \
slouken@0
   586
    } while(0)
slouken@0
   587
slouken@0
   588
/*
slouken@0
   589
 * For 16bpp pixels, we have stored the 5 most significant alpha bits in
slouken@0
   590
 * bits 5-10. As before, we can process all 3 RGB components at the same time.
slouken@0
   591
 */
slouken@7191
   592
#define BLIT_TRANSL_565(src, dst)       \
slouken@7191
   593
    do {                    \
slouken@7191
   594
    Uint32 s = src;             \
slouken@7191
   595
    Uint32 d = dst;             \
slouken@7191
   596
    unsigned alpha = (s & 0x3e0) >> 5;  \
slouken@7191
   597
    s &= 0x07e0f81f;            \
slouken@7191
   598
    d = (d | d << 16) & 0x07e0f81f;     \
slouken@7191
   599
    d += (s - d) * alpha >> 5;      \
slouken@7191
   600
    d &= 0x07e0f81f;            \
slouken@7191
   601
    dst = (Uint16)(d | d >> 16);            \
slouken@0
   602
    } while(0)
slouken@0
   603
slouken@7191
   604
#define BLIT_TRANSL_555(src, dst)       \
slouken@7191
   605
    do {                    \
slouken@7191
   606
    Uint32 s = src;             \
slouken@7191
   607
    Uint32 d = dst;             \
slouken@7191
   608
    unsigned alpha = (s & 0x3e0) >> 5;  \
slouken@7191
   609
    s &= 0x03e07c1f;            \
slouken@7191
   610
    d = (d | d << 16) & 0x03e07c1f;     \
slouken@7191
   611
    d += (s - d) * alpha >> 5;      \
slouken@7191
   612
    d &= 0x03e07c1f;            \
slouken@7191
   613
    dst = (Uint16)(d | d >> 16);            \
slouken@0
   614
    } while(0)
slouken@0
   615
slouken@0
   616
/* used to save the destination format in the encoding. Designed to be
slouken@0
   617
   macro-compatible with SDL_PixelFormat but without the unneeded fields */
slouken@1895
   618
typedef struct
slouken@1895
   619
{
slouken@1895
   620
    Uint8 BytesPerPixel;
slouken@5435
   621
    Uint8 padding[3];
slouken@5435
   622
    Uint32 Rmask;
slouken@5435
   623
    Uint32 Gmask;
slouken@5435
   624
    Uint32 Bmask;
slouken@5435
   625
    Uint32 Amask;
slouken@1895
   626
    Uint8 Rloss;
slouken@1895
   627
    Uint8 Gloss;
slouken@1895
   628
    Uint8 Bloss;
slouken@5435
   629
    Uint8 Aloss;
slouken@1895
   630
    Uint8 Rshift;
slouken@1895
   631
    Uint8 Gshift;
slouken@1895
   632
    Uint8 Bshift;
slouken@1895
   633
    Uint8 Ashift;
slouken@0
   634
} RLEDestFormat;
slouken@0
   635
slouken@0
   636
/* blit a pixel-alpha RLE surface clipped at the right and/or left edges */
slouken@1895
   637
static void
slouken@8922
   638
RLEAlphaClipBlit(int w, Uint8 * srcbuf, SDL_Surface * surf_dst,
slouken@1895
   639
                 Uint8 * dstbuf, SDL_Rect * srcrect)
slouken@0
   640
{
slouken@8922
   641
    SDL_PixelFormat *df = surf_dst->format;
slouken@0
   642
    /*
slouken@0
   643
     * clipped blitter: Ptype is the destination pixel type,
slouken@0
   644
     * Ctype the translucent count type, and do_blend the macro
slouken@0
   645
     * to blend one pixel.
slouken@0
   646
     */
slouken@7191
   647
#define RLEALPHACLIPBLIT(Ptype, Ctype, do_blend)              \
slouken@7191
   648
    do {                                  \
slouken@7191
   649
    int linecount = srcrect->h;                   \
slouken@7191
   650
    int left = srcrect->x;                        \
slouken@7191
   651
    int right = left + srcrect->w;                    \
slouken@7191
   652
    dstbuf -= left * sizeof(Ptype);                   \
slouken@7191
   653
    do {                                  \
slouken@7191
   654
        int ofs = 0;                          \
slouken@7191
   655
        /* blit opaque pixels on one line */              \
slouken@7191
   656
        do {                              \
slouken@7191
   657
        unsigned run;                         \
slouken@7191
   658
        ofs += ((Ctype *)srcbuf)[0];                  \
slouken@7191
   659
        run = ((Ctype *)srcbuf)[1];               \
slouken@7191
   660
        srcbuf += 2 * sizeof(Ctype);                  \
slouken@7191
   661
        if(run) {                         \
slouken@7191
   662
            /* clip to left and right borders */          \
slouken@7191
   663
            int cofs = ofs;                   \
slouken@7191
   664
            int crun = run;                   \
slouken@7191
   665
            if(left - cofs > 0) {                 \
slouken@7191
   666
            crun -= left - cofs;                  \
slouken@7191
   667
            cofs = left;                      \
slouken@7191
   668
            }                             \
slouken@7191
   669
            if(crun > right - cofs)               \
slouken@7191
   670
            crun = right - cofs;                  \
slouken@7191
   671
            if(crun > 0)                      \
slouken@7191
   672
            PIXEL_COPY(dstbuf + cofs * sizeof(Ptype),     \
slouken@7191
   673
                   srcbuf + (cofs - ofs) * sizeof(Ptype), \
slouken@7191
   674
                   (unsigned)crun, sizeof(Ptype));    \
slouken@7191
   675
            srcbuf += run * sizeof(Ptype);            \
slouken@7191
   676
            ofs += run;                       \
slouken@7191
   677
        } else if(!ofs)                       \
slouken@7191
   678
            return;                       \
slouken@7191
   679
        } while(ofs < w);                         \
slouken@7191
   680
        /* skip padding if necessary */               \
slouken@7191
   681
        if(sizeof(Ptype) == 2)                    \
slouken@7191
   682
        srcbuf += (uintptr_t)srcbuf & 2;              \
slouken@7191
   683
        /* blit translucent pixels on the same line */        \
slouken@7191
   684
        ofs = 0;                              \
slouken@7191
   685
        do {                              \
slouken@7191
   686
        unsigned run;                         \
slouken@7191
   687
        ofs += ((Uint16 *)srcbuf)[0];                 \
slouken@7191
   688
        run = ((Uint16 *)srcbuf)[1];                  \
slouken@7191
   689
        srcbuf += 4;                          \
slouken@7191
   690
        if(run) {                         \
slouken@7191
   691
            /* clip to left and right borders */          \
slouken@7191
   692
            int cofs = ofs;                   \
slouken@7191
   693
            int crun = run;                   \
slouken@7191
   694
            if(left - cofs > 0) {                 \
slouken@7191
   695
            crun -= left - cofs;                  \
slouken@7191
   696
            cofs = left;                      \
slouken@7191
   697
            }                             \
slouken@7191
   698
            if(crun > right - cofs)               \
slouken@7191
   699
            crun = right - cofs;                  \
slouken@7191
   700
            if(crun > 0) {                    \
slouken@7191
   701
            Ptype *dst = (Ptype *)dstbuf + cofs;          \
slouken@7191
   702
            Uint32 *src = (Uint32 *)srcbuf + (cofs - ofs);    \
slouken@7191
   703
            int i;                        \
slouken@7191
   704
            for(i = 0; i < crun; i++)             \
slouken@7191
   705
                do_blend(src[i], dst[i]);             \
slouken@7191
   706
            }                             \
slouken@7191
   707
            srcbuf += run * 4;                    \
slouken@7191
   708
            ofs += run;                       \
slouken@7191
   709
        }                             \
slouken@7191
   710
        } while(ofs < w);                         \
slouken@8922
   711
        dstbuf += surf_dst->pitch;                     \
slouken@7191
   712
    } while(--linecount);                         \
slouken@0
   713
    } while(0)
slouken@0
   714
slouken@1895
   715
    switch (df->BytesPerPixel) {
slouken@0
   716
    case 2:
slouken@1895
   717
        if (df->Gmask == 0x07e0 || df->Rmask == 0x07e0 || df->Bmask == 0x07e0)
slouken@1895
   718
            RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_565);
slouken@1895
   719
        else
slouken@1895
   720
            RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_555);
slouken@1895
   721
        break;
slouken@0
   722
    case 4:
slouken@1895
   723
        RLEALPHACLIPBLIT(Uint32, Uint16, BLIT_TRANSL_888);
slouken@1895
   724
        break;
slouken@0
   725
    }
slouken@0
   726
}
slouken@0
   727
slouken@0
   728
/* blit a pixel-alpha RLE surface */
slouken@1895
   729
int
slouken@8922
   730
SDL_RLEAlphaBlit(SDL_Surface * surf_src, SDL_Rect * srcrect,
slouken@8922
   731
                 SDL_Surface * surf_dst, SDL_Rect * dstrect)
slouken@0
   732
{
slouken@0
   733
    int x, y;
slouken@8922
   734
    int w = surf_src->w;
slouken@0
   735
    Uint8 *srcbuf, *dstbuf;
slouken@8922
   736
    SDL_PixelFormat *df = surf_dst->format;
slouken@0
   737
slouken@0
   738
    /* Lock the destination if necessary */
slouken@8922
   739
    if (SDL_MUSTLOCK(surf_dst)) {
slouken@8922
   740
        if (SDL_LockSurface(surf_dst) < 0) {
slouken@1895
   741
            return -1;
slouken@1895
   742
        }
slouken@0
   743
    }
slouken@0
   744
slouken@0
   745
    x = dstrect->x;
slouken@0
   746
    y = dstrect->y;
slouken@8922
   747
    dstbuf = (Uint8 *) surf_dst->pixels + y * surf_dst->pitch + x * df->BytesPerPixel;
slouken@8922
   748
    srcbuf = (Uint8 *) surf_src->map->data + sizeof(RLEDestFormat);
slouken@0
   749
slouken@0
   750
    {
slouken@1895
   751
        /* skip lines at the top if necessary */
slouken@1895
   752
        int vskip = srcrect->y;
slouken@1895
   753
        if (vskip) {
slouken@1895
   754
            int ofs;
slouken@1895
   755
            if (df->BytesPerPixel == 2) {
slouken@1895
   756
                /* the 16/32 interleaved format */
slouken@1895
   757
                do {
slouken@1895
   758
                    /* skip opaque line */
slouken@1895
   759
                    ofs = 0;
slouken@1895
   760
                    do {
slouken@1895
   761
                        int run;
slouken@1895
   762
                        ofs += srcbuf[0];
slouken@1895
   763
                        run = srcbuf[1];
slouken@1895
   764
                        srcbuf += 2;
slouken@1895
   765
                        if (run) {
slouken@1895
   766
                            srcbuf += 2 * run;
slouken@1895
   767
                            ofs += run;
slouken@1895
   768
                        } else if (!ofs)
slouken@1895
   769
                            goto done;
slouken@2735
   770
                    } while (ofs < w);
slouken@0
   771
slouken@1895
   772
                    /* skip padding */
slouken@1895
   773
                    srcbuf += (uintptr_t) srcbuf & 2;
slouken@0
   774
slouken@1895
   775
                    /* skip translucent line */
slouken@1895
   776
                    ofs = 0;
slouken@1895
   777
                    do {
slouken@1895
   778
                        int run;
slouken@1895
   779
                        ofs += ((Uint16 *) srcbuf)[0];
slouken@1895
   780
                        run = ((Uint16 *) srcbuf)[1];
slouken@1895
   781
                        srcbuf += 4 * (run + 1);
slouken@1895
   782
                        ofs += run;
slouken@2735
   783
                    } while (ofs < w);
slouken@2735
   784
                } while (--vskip);
slouken@1895
   785
            } else {
slouken@1895
   786
                /* the 32/32 interleaved format */
slouken@1895
   787
                vskip <<= 1;    /* opaque and translucent have same format */
slouken@1895
   788
                do {
slouken@1895
   789
                    ofs = 0;
slouken@1895
   790
                    do {
slouken@1895
   791
                        int run;
slouken@1895
   792
                        ofs += ((Uint16 *) srcbuf)[0];
slouken@1895
   793
                        run = ((Uint16 *) srcbuf)[1];
slouken@1895
   794
                        srcbuf += 4;
slouken@1895
   795
                        if (run) {
slouken@1895
   796
                            srcbuf += 4 * run;
slouken@1895
   797
                            ofs += run;
slouken@1895
   798
                        } else if (!ofs)
slouken@1895
   799
                            goto done;
slouken@2735
   800
                    } while (ofs < w);
slouken@2735
   801
                } while (--vskip);
slouken@1895
   802
            }
slouken@1895
   803
        }
slouken@0
   804
    }
slouken@0
   805
slouken@0
   806
    /* if left or right edge clipping needed, call clip blit */
slouken@8922
   807
    if (srcrect->x || srcrect->w != surf_src->w) {
slouken@8922
   808
        RLEAlphaClipBlit(w, srcbuf, surf_dst, dstbuf, srcrect);
slouken@0
   809
    } else {
slouken@0
   810
slouken@1895
   811
        /*
slouken@1895
   812
         * non-clipped blitter. Ptype is the destination pixel type,
slouken@1895
   813
         * Ctype the translucent count type, and do_blend the
slouken@1895
   814
         * macro to blend one pixel.
slouken@1895
   815
         */
slouken@7191
   816
#define RLEALPHABLIT(Ptype, Ctype, do_blend)                 \
slouken@7191
   817
    do {                                 \
slouken@7191
   818
        int linecount = srcrect->h;                  \
slouken@7191
   819
        do {                             \
slouken@7191
   820
        int ofs = 0;                         \
slouken@7191
   821
        /* blit opaque pixels on one line */             \
slouken@7191
   822
        do {                             \
slouken@7191
   823
            unsigned run;                    \
slouken@7191
   824
            ofs += ((Ctype *)srcbuf)[0];             \
slouken@7191
   825
            run = ((Ctype *)srcbuf)[1];              \
slouken@7191
   826
            srcbuf += 2 * sizeof(Ctype);             \
slouken@7191
   827
            if(run) {                        \
slouken@7191
   828
            PIXEL_COPY(dstbuf + ofs * sizeof(Ptype), srcbuf, \
slouken@7191
   829
                   run, sizeof(Ptype));          \
slouken@7191
   830
            srcbuf += run * sizeof(Ptype);           \
slouken@7191
   831
            ofs += run;                  \
slouken@7191
   832
            } else if(!ofs)                  \
slouken@7191
   833
            goto done;                   \
slouken@7191
   834
        } while(ofs < w);                    \
slouken@7191
   835
        /* skip padding if necessary */              \
slouken@7191
   836
        if(sizeof(Ptype) == 2)                   \
slouken@7191
   837
            srcbuf += (uintptr_t)srcbuf & 2;             \
slouken@7191
   838
        /* blit translucent pixels on the same line */       \
slouken@7191
   839
        ofs = 0;                         \
slouken@7191
   840
        do {                             \
slouken@7191
   841
            unsigned run;                    \
slouken@7191
   842
            ofs += ((Uint16 *)srcbuf)[0];            \
slouken@7191
   843
            run = ((Uint16 *)srcbuf)[1];             \
slouken@7191
   844
            srcbuf += 4;                     \
slouken@7191
   845
            if(run) {                        \
slouken@7191
   846
            Ptype *dst = (Ptype *)dstbuf + ofs;      \
slouken@7191
   847
            unsigned i;                  \
slouken@7191
   848
            for(i = 0; i < run; i++) {           \
slouken@7191
   849
                Uint32 src = *(Uint32 *)srcbuf;      \
slouken@7191
   850
                do_blend(src, *dst);             \
slouken@7191
   851
                srcbuf += 4;                 \
slouken@7191
   852
                dst++;                   \
slouken@7191
   853
            }                        \
slouken@7191
   854
            ofs += run;                  \
slouken@7191
   855
            }                            \
slouken@7191
   856
        } while(ofs < w);                    \
slouken@8922
   857
        dstbuf += surf_dst->pitch;                    \
slouken@7191
   858
        } while(--linecount);                    \
slouken@7191
   859
    } while(0)
slouken@0
   860
slouken@1895
   861
        switch (df->BytesPerPixel) {
slouken@1895
   862
        case 2:
slouken@1895
   863
            if (df->Gmask == 0x07e0 || df->Rmask == 0x07e0
slouken@1895
   864
                || df->Bmask == 0x07e0)
slouken@1895
   865
                RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_565);
slouken@1895
   866
            else
slouken@1895
   867
                RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_555);
slouken@1895
   868
            break;
slouken@1895
   869
        case 4:
slouken@1895
   870
            RLEALPHABLIT(Uint32, Uint16, BLIT_TRANSL_888);
slouken@1895
   871
            break;
slouken@1895
   872
        }
slouken@0
   873
    }
slouken@0
   874
slouken@1895
   875
  done:
slouken@0
   876
    /* Unlock the destination if necessary */
slouken@8922
   877
    if (SDL_MUSTLOCK(surf_dst)) {
slouken@8922
   878
        SDL_UnlockSurface(surf_dst);
slouken@0
   879
    }
slouken@0
   880
    return 0;
slouken@0
   881
}
slouken@0
   882
slouken@0
   883
/*
slouken@0
   884
 * Auxiliary functions:
slouken@0
   885
 * The encoding functions take 32bpp rgb + a, and
slouken@0
   886
 * return the number of bytes copied to the destination.
slouken@0
   887
 * The decoding functions copy to 32bpp rgb + a, and
slouken@0
   888
 * return the number of bytes copied from the source.
slouken@0
   889
 * These are only used in the encoder and un-RLE code and are therefore not
slouken@0
   890
 * highly optimised.
slouken@0
   891
 */
slouken@0
   892
slouken@0
   893
/* encode 32bpp rgb + a into 16bpp rgb, losing alpha */
slouken@1895
   894
static int
slouken@1895
   895
copy_opaque_16(void *dst, Uint32 * src, int n,
slouken@1895
   896
               SDL_PixelFormat * sfmt, SDL_PixelFormat * dfmt)
slouken@0
   897
{
slouken@0
   898
    int i;
slouken@0
   899
    Uint16 *d = dst;
slouken@1895
   900
    for (i = 0; i < n; i++) {
slouken@1895
   901
        unsigned r, g, b;
slouken@1895
   902
        RGB_FROM_PIXEL(*src, sfmt, r, g, b);
slouken@1895
   903
        PIXEL_FROM_RGB(*d, dfmt, r, g, b);
slouken@1895
   904
        src++;
slouken@1895
   905
        d++;
slouken@0
   906
    }
slouken@0
   907
    return n * 2;
slouken@0
   908
}
slouken@0
   909
slouken@0
   910
/* decode opaque pixels from 16bpp to 32bpp rgb + a */
slouken@1895
   911
static int
slouken@1895
   912
uncopy_opaque_16(Uint32 * dst, void *src, int n,
slouken@1895
   913
                 RLEDestFormat * sfmt, SDL_PixelFormat * dfmt)
slouken@0
   914
{
slouken@0
   915
    int i;
slouken@0
   916
    Uint16 *s = src;
slouken@0
   917
    unsigned alpha = dfmt->Amask ? 255 : 0;
slouken@1895
   918
    for (i = 0; i < n; i++) {
slouken@1895
   919
        unsigned r, g, b;
slouken@1895
   920
        RGB_FROM_PIXEL(*s, sfmt, r, g, b);
slouken@1895
   921
        PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, alpha);
slouken@1895
   922
        s++;
slouken@1895
   923
        dst++;
slouken@0
   924
    }
slouken@0
   925
    return n * 2;
slouken@0
   926
}
slouken@0
   927
slouken@0
   928
slouken@0
   929
slouken@0
   930
/* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 565 */
slouken@1895
   931
static int
slouken@1895
   932
copy_transl_565(void *dst, Uint32 * src, int n,
slouken@1895
   933
                SDL_PixelFormat * sfmt, SDL_PixelFormat * dfmt)
slouken@0
   934
{
slouken@0
   935
    int i;
slouken@0
   936
    Uint32 *d = dst;
slouken@1895
   937
    for (i = 0; i < n; i++) {
slouken@1895
   938
        unsigned r, g, b, a;
slouken@1895
   939
        Uint16 pix;
slouken@1895
   940
        RGBA_FROM_8888(*src, sfmt, r, g, b, a);
slouken@1895
   941
        PIXEL_FROM_RGB(pix, dfmt, r, g, b);
slouken@1895
   942
        *d = ((pix & 0x7e0) << 16) | (pix & 0xf81f) | ((a << 2) & 0x7e0);
slouken@1895
   943
        src++;
slouken@1895
   944
        d++;
slouken@0
   945
    }
slouken@0
   946
    return n * 4;
slouken@0
   947
}
slouken@0
   948
slouken@0
   949
/* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 555 */
slouken@1895
   950
static int
slouken@1895
   951
copy_transl_555(void *dst, Uint32 * src, int n,
slouken@1895
   952
                SDL_PixelFormat * sfmt, SDL_PixelFormat * dfmt)
slouken@0
   953
{
slouken@0
   954
    int i;
slouken@0
   955
    Uint32 *d = dst;
slouken@1895
   956
    for (i = 0; i < n; i++) {
slouken@1895
   957
        unsigned r, g, b, a;
slouken@1895
   958
        Uint16 pix;
slouken@1895
   959
        RGBA_FROM_8888(*src, sfmt, r, g, b, a);
slouken@1895
   960
        PIXEL_FROM_RGB(pix, dfmt, r, g, b);
slouken@5439
   961
        *d = ((pix & 0x3e0) << 16) | (pix & 0xfc1f) | ((a << 2) & 0x3e0);
slouken@1895
   962
        src++;
slouken@1895
   963
        d++;
slouken@0
   964
    }
slouken@0
   965
    return n * 4;
slouken@0
   966
}
slouken@0
   967
slouken@0
   968
/* decode translucent pixels from 32bpp GORAB to 32bpp rgb + a */
slouken@1895
   969
static int
slouken@1895
   970
uncopy_transl_16(Uint32 * dst, void *src, int n,
slouken@1895
   971
                 RLEDestFormat * sfmt, SDL_PixelFormat * dfmt)
slouken@0
   972
{
slouken@0
   973
    int i;
slouken@0
   974
    Uint32 *s = src;
slouken@1895
   975
    for (i = 0; i < n; i++) {
slouken@1895
   976
        unsigned r, g, b, a;
slouken@1895
   977
        Uint32 pix = *s++;
slouken@1895
   978
        a = (pix & 0x3e0) >> 2;
slouken@1895
   979
        pix = (pix & ~0x3e0) | pix >> 16;
slouken@1895
   980
        RGB_FROM_PIXEL(pix, sfmt, r, g, b);
slouken@1895
   981
        PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a);
slouken@1895
   982
        dst++;
slouken@0
   983
    }
slouken@0
   984
    return n * 4;
slouken@0
   985
}
slouken@0
   986
slouken@0
   987
/* encode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */
slouken@1895
   988
static int
slouken@1895
   989
copy_32(void *dst, Uint32 * src, int n,
slouken@1895
   990
        SDL_PixelFormat * sfmt, SDL_PixelFormat * dfmt)
slouken@0
   991
{
slouken@0
   992
    int i;
slouken@0
   993
    Uint32 *d = dst;
slouken@1895
   994
    for (i = 0; i < n; i++) {
slouken@1895
   995
        unsigned r, g, b, a;
slouken@1895
   996
        RGBA_FROM_8888(*src, sfmt, r, g, b, a);
slouken@9761
   997
        RLEPIXEL_FROM_RGBA(*d, dfmt, r, g, b, a);
icculus@5631
   998
        d++;
slouken@1895
   999
        src++;
slouken@0
  1000
    }
slouken@0
  1001
    return n * 4;
slouken@0
  1002
}
slouken@0
  1003
slouken@0
  1004
/* decode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */
slouken@1895
  1005
static int
slouken@1895
  1006
uncopy_32(Uint32 * dst, void *src, int n,
slouken@1895
  1007
          RLEDestFormat * sfmt, SDL_PixelFormat * dfmt)
slouken@0
  1008
{
slouken@0
  1009
    int i;
slouken@0
  1010
    Uint32 *s = src;
slouken@1895
  1011
    for (i = 0; i < n; i++) {
slouken@1895
  1012
        unsigned r, g, b, a;
slouken@1895
  1013
        Uint32 pixel = *s++;
slouken@1895
  1014
        RGB_FROM_PIXEL(pixel, sfmt, r, g, b);
slouken@1895
  1015
        a = pixel >> 24;
slouken@1895
  1016
        PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a);
slouken@1895
  1017
        dst++;
slouken@0
  1018
    }
slouken@0
  1019
    return n * 4;
slouken@0
  1020
}
slouken@0
  1021
slouken@0
  1022
#define ISOPAQUE(pixel, fmt) ((((pixel) & fmt->Amask) >> fmt->Ashift) == 255)
slouken@0
  1023
slouken@7191
  1024
#define ISTRANSL(pixel, fmt)    \
slouken@0
  1025
    ((unsigned)((((pixel) & fmt->Amask) >> fmt->Ashift) - 1U) < 254U)
slouken@0
  1026
slouken@0
  1027
/* convert surface to be quickly alpha-blittable onto dest, if possible */
slouken@1895
  1028
static int
slouken@1895
  1029
RLEAlphaSurface(SDL_Surface * surface)
slouken@0
  1030
{
slouken@0
  1031
    SDL_Surface *dest;
slouken@0
  1032
    SDL_PixelFormat *df;
slouken@0
  1033
    int maxsize = 0;
slouken@0
  1034
    int max_opaque_run;
slouken@0
  1035
    int max_transl_run = 65535;
slouken@0
  1036
    unsigned masksum;
slouken@0
  1037
    Uint8 *rlebuf, *dst;
slouken@1895
  1038
    int (*copy_opaque) (void *, Uint32 *, int,
slouken@1895
  1039
                        SDL_PixelFormat *, SDL_PixelFormat *);
slouken@1895
  1040
    int (*copy_transl) (void *, Uint32 *, int,
slouken@1895
  1041
                        SDL_PixelFormat *, SDL_PixelFormat *);
slouken@0
  1042
slouken@0
  1043
    dest = surface->map->dst;
slouken@1895
  1044
    if (!dest)
slouken@1895
  1045
        return -1;
slouken@0
  1046
    df = dest->format;
slouken@1895
  1047
    if (surface->format->BitsPerPixel != 32)
slouken@1895
  1048
        return -1;              /* only 32bpp source supported */
slouken@0
  1049
slouken@0
  1050
    /* find out whether the destination is one we support,
slouken@0
  1051
       and determine the max size of the encoded result */
slouken@0
  1052
    masksum = df->Rmask | df->Gmask | df->Bmask;
slouken@1895
  1053
    switch (df->BytesPerPixel) {
slouken@0
  1054
    case 2:
slouken@1895
  1055
        /* 16bpp: only support 565 and 555 formats */
slouken@1895
  1056
        switch (masksum) {
slouken@1895
  1057
        case 0xffff:
slouken@1895
  1058
            if (df->Gmask == 0x07e0
slouken@1895
  1059
                || df->Rmask == 0x07e0 || df->Bmask == 0x07e0) {
slouken@1895
  1060
                copy_opaque = copy_opaque_16;
slouken@1895
  1061
                copy_transl = copy_transl_565;
slouken@1895
  1062
            } else
slouken@1895
  1063
                return -1;
slouken@1895
  1064
            break;
slouken@1895
  1065
        case 0x7fff:
slouken@1895
  1066
            if (df->Gmask == 0x03e0
slouken@1895
  1067
                || df->Rmask == 0x03e0 || df->Bmask == 0x03e0) {
slouken@1895
  1068
                copy_opaque = copy_opaque_16;
slouken@1895
  1069
                copy_transl = copy_transl_555;
slouken@1895
  1070
            } else
slouken@1895
  1071
                return -1;
slouken@1895
  1072
            break;
slouken@1895
  1073
        default:
slouken@1895
  1074
            return -1;
slouken@1895
  1075
        }
slouken@1895
  1076
        max_opaque_run = 255;   /* runs stored as bytes */
slouken@0
  1077
slouken@1895
  1078
        /* worst case is alternating opaque and translucent pixels,
slouken@1895
  1079
           with room for alignment padding between lines */
slouken@1895
  1080
        maxsize = surface->h * (2 + (4 + 2) * (surface->w + 1)) + 2;
slouken@1895
  1081
        break;
slouken@0
  1082
    case 4:
slouken@1895
  1083
        if (masksum != 0x00ffffff)
slouken@1895
  1084
            return -1;          /* requires unused high byte */
slouken@1895
  1085
        copy_opaque = copy_32;
slouken@1895
  1086
        copy_transl = copy_32;
slouken@1895
  1087
        max_opaque_run = 255;   /* runs stored as short ints */
slouken@0
  1088
slouken@1895
  1089
        /* worst case is alternating opaque and translucent pixels */
slouken@1895
  1090
        maxsize = surface->h * 2 * 4 * (surface->w + 1) + 4;
slouken@1895
  1091
        break;
slouken@0
  1092
    default:
slouken@1895
  1093
        return -1;              /* anything else unsupported right now */
slouken@0
  1094
    }
slouken@0
  1095
slouken@0
  1096
    maxsize += sizeof(RLEDestFormat);
slouken@1895
  1097
    rlebuf = (Uint8 *) SDL_malloc(maxsize);
slouken@1895
  1098
    if (!rlebuf) {
icculus@7037
  1099
        return SDL_OutOfMemory();
slouken@0
  1100
    }
slouken@0
  1101
    {
slouken@1895
  1102
        /* save the destination format so we can undo the encoding later */
slouken@1895
  1103
        RLEDestFormat *r = (RLEDestFormat *) rlebuf;
slouken@1895
  1104
        r->BytesPerPixel = df->BytesPerPixel;
slouken@5435
  1105
        r->Rmask = df->Rmask;
slouken@5435
  1106
        r->Gmask = df->Gmask;
slouken@5435
  1107
        r->Bmask = df->Bmask;
slouken@5435
  1108
        r->Amask = df->Amask;
slouken@1895
  1109
        r->Rloss = df->Rloss;
slouken@1895
  1110
        r->Gloss = df->Gloss;
slouken@1895
  1111
        r->Bloss = df->Bloss;
slouken@5435
  1112
        r->Aloss = df->Aloss;
slouken@1895
  1113
        r->Rshift = df->Rshift;
slouken@1895
  1114
        r->Gshift = df->Gshift;
slouken@1895
  1115
        r->Bshift = df->Bshift;
slouken@1895
  1116
        r->Ashift = df->Ashift;
slouken@0
  1117
    }
slouken@0
  1118
    dst = rlebuf + sizeof(RLEDestFormat);
slouken@0
  1119
slouken@0
  1120
    /* Do the actual encoding */
slouken@0
  1121
    {
slouken@1895
  1122
        int x, y;
slouken@1895
  1123
        int h = surface->h, w = surface->w;
slouken@1895
  1124
        SDL_PixelFormat *sf = surface->format;
slouken@1895
  1125
        Uint32 *src = (Uint32 *) surface->pixels;
slouken@1895
  1126
        Uint8 *lastline = dst;  /* end of last non-blank line */
slouken@0
  1127
slouken@1895
  1128
        /* opaque counts are 8 or 16 bits, depending on target depth */
slouken@7191
  1129
#define ADD_OPAQUE_COUNTS(n, m)         \
slouken@7191
  1130
    if(df->BytesPerPixel == 4) {        \
slouken@7191
  1131
        ((Uint16 *)dst)[0] = n;     \
slouken@7191
  1132
        ((Uint16 *)dst)[1] = m;     \
slouken@7191
  1133
        dst += 4;               \
slouken@7191
  1134
    } else {                \
slouken@7191
  1135
        dst[0] = n;             \
slouken@7191
  1136
        dst[1] = m;             \
slouken@7191
  1137
        dst += 2;               \
slouken@7191
  1138
    }
slouken@0
  1139
slouken@1895
  1140
        /* translucent counts are always 16 bit */
slouken@7191
  1141
#define ADD_TRANSL_COUNTS(n, m)     \
slouken@7191
  1142
    (((Uint16 *)dst)[0] = n, ((Uint16 *)dst)[1] = m, dst += 4)
slouken@0
  1143
slouken@1895
  1144
        for (y = 0; y < h; y++) {
slouken@1895
  1145
            int runstart, skipstart;
slouken@1895
  1146
            int blankline = 0;
slouken@1895
  1147
            /* First encode all opaque pixels of a scan line */
slouken@1895
  1148
            x = 0;
slouken@1895
  1149
            do {
slouken@1895
  1150
                int run, skip, len;
slouken@1895
  1151
                skipstart = x;
slouken@1895
  1152
                while (x < w && !ISOPAQUE(src[x], sf))
slouken@1895
  1153
                    x++;
slouken@1895
  1154
                runstart = x;
slouken@1895
  1155
                while (x < w && ISOPAQUE(src[x], sf))
slouken@1895
  1156
                    x++;
slouken@1895
  1157
                skip = runstart - skipstart;
slouken@1895
  1158
                if (skip == w)
slouken@1895
  1159
                    blankline = 1;
slouken@1895
  1160
                run = x - runstart;
slouken@1895
  1161
                while (skip > max_opaque_run) {
slouken@1895
  1162
                    ADD_OPAQUE_COUNTS(max_opaque_run, 0);
slouken@1895
  1163
                    skip -= max_opaque_run;
slouken@1895
  1164
                }
slouken@1895
  1165
                len = MIN(run, max_opaque_run);
slouken@1895
  1166
                ADD_OPAQUE_COUNTS(skip, len);
slouken@1895
  1167
                dst += copy_opaque(dst, src + runstart, len, sf, df);
slouken@1895
  1168
                runstart += len;
slouken@1895
  1169
                run -= len;
slouken@1895
  1170
                while (run) {
slouken@1895
  1171
                    len = MIN(run, max_opaque_run);
slouken@1895
  1172
                    ADD_OPAQUE_COUNTS(0, len);
slouken@1895
  1173
                    dst += copy_opaque(dst, src + runstart, len, sf, df);
slouken@1895
  1174
                    runstart += len;
slouken@1895
  1175
                    run -= len;
slouken@1895
  1176
                }
slouken@2735
  1177
            } while (x < w);
slouken@0
  1178
slouken@1895
  1179
            /* Make sure the next output address is 32-bit aligned */
slouken@1895
  1180
            dst += (uintptr_t) dst & 2;
slouken@0
  1181
slouken@1895
  1182
            /* Next, encode all translucent pixels of the same scan line */
slouken@1895
  1183
            x = 0;
slouken@1895
  1184
            do {
slouken@1895
  1185
                int run, skip, len;
slouken@1895
  1186
                skipstart = x;
slouken@1895
  1187
                while (x < w && !ISTRANSL(src[x], sf))
slouken@1895
  1188
                    x++;
slouken@1895
  1189
                runstart = x;
slouken@1895
  1190
                while (x < w && ISTRANSL(src[x], sf))
slouken@1895
  1191
                    x++;
slouken@1895
  1192
                skip = runstart - skipstart;
slouken@1895
  1193
                blankline &= (skip == w);
slouken@1895
  1194
                run = x - runstart;
slouken@1895
  1195
                while (skip > max_transl_run) {
slouken@1895
  1196
                    ADD_TRANSL_COUNTS(max_transl_run, 0);
slouken@1895
  1197
                    skip -= max_transl_run;
slouken@1895
  1198
                }
slouken@1895
  1199
                len = MIN(run, max_transl_run);
slouken@1895
  1200
                ADD_TRANSL_COUNTS(skip, len);
slouken@1895
  1201
                dst += copy_transl(dst, src + runstart, len, sf, df);
slouken@1895
  1202
                runstart += len;
slouken@1895
  1203
                run -= len;
slouken@1895
  1204
                while (run) {
slouken@1895
  1205
                    len = MIN(run, max_transl_run);
slouken@1895
  1206
                    ADD_TRANSL_COUNTS(0, len);
slouken@1895
  1207
                    dst += copy_transl(dst, src + runstart, len, sf, df);
slouken@1895
  1208
                    runstart += len;
slouken@1895
  1209
                    run -= len;
slouken@1895
  1210
                }
slouken@1895
  1211
                if (!blankline)
slouken@1895
  1212
                    lastline = dst;
slouken@2735
  1213
            } while (x < w);
slouken@0
  1214
slouken@1895
  1215
            src += surface->pitch >> 2;
slouken@1895
  1216
        }
slouken@1895
  1217
        dst = lastline;         /* back up past trailing blank lines */
slouken@1895
  1218
        ADD_OPAQUE_COUNTS(0, 0);
slouken@0
  1219
    }
slouken@0
  1220
slouken@0
  1221
#undef ADD_OPAQUE_COUNTS
slouken@0
  1222
#undef ADD_TRANSL_COUNTS
slouken@0
  1223
slouken@0
  1224
    /* Now that we have it encoded, release the original pixels */
slouken@2222
  1225
    if (!(surface->flags & SDL_PREALLOC)) {
slouken@1895
  1226
        SDL_free(surface->pixels);
slouken@1895
  1227
        surface->pixels = NULL;
slouken@0
  1228
    }
slouken@0
  1229
slouken@0
  1230
    /* realloc the buffer to release unused memory */
slouken@0
  1231
    {
slouken@1895
  1232
        Uint8 *p = SDL_realloc(rlebuf, dst - rlebuf);
slouken@1895
  1233
        if (!p)
slouken@1895
  1234
            p = rlebuf;
slouken@2257
  1235
        surface->map->data = p;
slouken@0
  1236
    }
slouken@0
  1237
slouken@0
  1238
    return 0;
slouken@0
  1239
}
slouken@0
  1240
slouken@1895
  1241
static Uint32
slouken@1895
  1242
getpix_8(Uint8 * srcbuf)
slouken@0
  1243
{
slouken@0
  1244
    return *srcbuf;
slouken@0
  1245
}
slouken@0
  1246
slouken@1895
  1247
static Uint32
slouken@1895
  1248
getpix_16(Uint8 * srcbuf)
slouken@0
  1249
{
slouken@1895
  1250
    return *(Uint16 *) srcbuf;
slouken@0
  1251
}
slouken@0
  1252
slouken@1895
  1253
static Uint32
slouken@1895
  1254
getpix_24(Uint8 * srcbuf)
slouken@0
  1255
{
icculus@1155
  1256
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
icculus@1155
  1257
    return srcbuf[0] + (srcbuf[1] << 8) + (srcbuf[2] << 16);
icculus@1155
  1258
#else
icculus@1155
  1259
    return (srcbuf[0] << 16) + (srcbuf[1] << 8) + srcbuf[2];
icculus@1155
  1260
#endif
slouken@0
  1261
}
slouken@0
  1262
slouken@1895
  1263
static Uint32
slouken@1895
  1264
getpix_32(Uint8 * srcbuf)
slouken@0
  1265
{
slouken@1895
  1266
    return *(Uint32 *) srcbuf;
slouken@0
  1267
}
slouken@0
  1268
slouken@1895
  1269
typedef Uint32(*getpix_func) (Uint8 *);
slouken@0
  1270
slouken@3162
  1271
static const getpix_func getpixes[4] = {
slouken@0
  1272
    getpix_8, getpix_16, getpix_24, getpix_32
slouken@0
  1273
};
slouken@0
  1274
slouken@1895
  1275
static int
slouken@1895
  1276
RLEColorkeySurface(SDL_Surface * surface)
slouken@0
  1277
{
slouken@1895
  1278
    Uint8 *rlebuf, *dst;
slouken@1895
  1279
    int maxn;
slouken@1895
  1280
    int y;
icculus@6389
  1281
    Uint8 *srcbuf, *lastline;
slouken@1895
  1282
    int maxsize = 0;
slouken@1895
  1283
    int bpp = surface->format->BytesPerPixel;
slouken@1895
  1284
    getpix_func getpix;
slouken@1895
  1285
    Uint32 ckey, rgbmask;
slouken@1895
  1286
    int w, h;
slouken@0
  1287
slouken@1895
  1288
    /* calculate the worst case size for the compressed surface */
slouken@1895
  1289
    switch (bpp) {
slouken@1895
  1290
    case 1:
slouken@1895
  1291
        /* worst case is alternating opaque and transparent pixels,
slouken@1895
  1292
           starting with an opaque pixel */
slouken@1895
  1293
        maxsize = surface->h * 3 * (surface->w / 2 + 1) + 2;
slouken@1895
  1294
        break;
slouken@1895
  1295
    case 2:
slouken@1895
  1296
    case 3:
slouken@1895
  1297
        /* worst case is solid runs, at most 255 pixels wide */
slouken@1895
  1298
        maxsize = surface->h * (2 * (surface->w / 255 + 1)
slouken@1895
  1299
                                + surface->w * bpp) + 2;
slouken@1895
  1300
        break;
slouken@1895
  1301
    case 4:
slouken@1895
  1302
        /* worst case is solid runs, at most 65535 pixels wide */
slouken@1895
  1303
        maxsize = surface->h * (4 * (surface->w / 65535 + 1)
slouken@1895
  1304
                                + surface->w * 4) + 4;
slouken@1895
  1305
        break;
slouken@1895
  1306
    }
slouken@0
  1307
slouken@1895
  1308
    rlebuf = (Uint8 *) SDL_malloc(maxsize);
slouken@1895
  1309
    if (rlebuf == NULL) {
icculus@7037
  1310
        return SDL_OutOfMemory();
slouken@1895
  1311
    }
slouken@0
  1312
slouken@1895
  1313
    /* Set up the conversion */
slouken@1895
  1314
    srcbuf = (Uint8 *) surface->pixels;
slouken@1895
  1315
    maxn = bpp == 4 ? 65535 : 255;
slouken@1895
  1316
    dst = rlebuf;
slouken@1895
  1317
    rgbmask = ~surface->format->Amask;
slouken@2262
  1318
    ckey = surface->map->info.colorkey & rgbmask;
slouken@1895
  1319
    lastline = dst;
slouken@1895
  1320
    getpix = getpixes[bpp - 1];
slouken@1895
  1321
    w = surface->w;
slouken@1895
  1322
    h = surface->h;
slouken@0
  1323
slouken@7191
  1324
#define ADD_COUNTS(n, m)            \
slouken@7191
  1325
    if(bpp == 4) {              \
slouken@7191
  1326
        ((Uint16 *)dst)[0] = n;     \
slouken@7191
  1327
        ((Uint16 *)dst)[1] = m;     \
slouken@7191
  1328
        dst += 4;               \
slouken@7191
  1329
    } else {                \
slouken@7191
  1330
        dst[0] = n;             \
slouken@7191
  1331
        dst[1] = m;             \
slouken@7191
  1332
        dst += 2;               \
slouken@7191
  1333
    }
slouken@0
  1334
slouken@1895
  1335
    for (y = 0; y < h; y++) {
slouken@1895
  1336
        int x = 0;
slouken@1895
  1337
        int blankline = 0;
slouken@1895
  1338
        do {
slouken@1895
  1339
            int run, skip, len;
slouken@1895
  1340
            int runstart;
slouken@1895
  1341
            int skipstart = x;
slouken@0
  1342
slouken@1895
  1343
            /* find run of transparent, then opaque pixels */
slouken@1895
  1344
            while (x < w && (getpix(srcbuf + x * bpp) & rgbmask) == ckey)
slouken@1895
  1345
                x++;
slouken@1895
  1346
            runstart = x;
slouken@1895
  1347
            while (x < w && (getpix(srcbuf + x * bpp) & rgbmask) != ckey)
slouken@1895
  1348
                x++;
slouken@1895
  1349
            skip = runstart - skipstart;
slouken@1895
  1350
            if (skip == w)
slouken@1895
  1351
                blankline = 1;
slouken@1895
  1352
            run = x - runstart;
slouken@0
  1353
slouken@1895
  1354
            /* encode segment */
slouken@1895
  1355
            while (skip > maxn) {
slouken@1895
  1356
                ADD_COUNTS(maxn, 0);
slouken@1895
  1357
                skip -= maxn;
slouken@1895
  1358
            }
slouken@1895
  1359
            len = MIN(run, maxn);
slouken@1895
  1360
            ADD_COUNTS(skip, len);
slouken@1895
  1361
            SDL_memcpy(dst, srcbuf + runstart * bpp, len * bpp);
slouken@1895
  1362
            dst += len * bpp;
slouken@1895
  1363
            run -= len;
slouken@1895
  1364
            runstart += len;
slouken@1895
  1365
            while (run) {
slouken@1895
  1366
                len = MIN(run, maxn);
slouken@1895
  1367
                ADD_COUNTS(0, len);
slouken@1895
  1368
                SDL_memcpy(dst, srcbuf + runstart * bpp, len * bpp);
slouken@1895
  1369
                dst += len * bpp;
slouken@1895
  1370
                runstart += len;
slouken@1895
  1371
                run -= len;
slouken@1895
  1372
            }
slouken@1895
  1373
            if (!blankline)
slouken@1895
  1374
                lastline = dst;
slouken@2735
  1375
        } while (x < w);
slouken@0
  1376
slouken@1895
  1377
        srcbuf += surface->pitch;
slouken@1895
  1378
    }
slouken@1895
  1379
    dst = lastline;             /* back up bast trailing blank lines */
slouken@1895
  1380
    ADD_COUNTS(0, 0);
slouken@0
  1381
slouken@0
  1382
#undef ADD_COUNTS
slouken@0
  1383
slouken@1895
  1384
    /* Now that we have it encoded, release the original pixels */
slouken@2222
  1385
    if (!(surface->flags & SDL_PREALLOC)) {
slouken@1895
  1386
        SDL_free(surface->pixels);
slouken@1895
  1387
        surface->pixels = NULL;
slouken@1895
  1388
    }
slouken@0
  1389
slouken@1895
  1390
    /* realloc the buffer to release unused memory */
slouken@1895
  1391
    {
slouken@1895
  1392
        /* If realloc returns NULL, the original block is left intact */
slouken@1895
  1393
        Uint8 *p = SDL_realloc(rlebuf, dst - rlebuf);
slouken@1895
  1394
        if (!p)
slouken@1895
  1395
            p = rlebuf;
slouken@2257
  1396
        surface->map->data = p;
slouken@1895
  1397
    }
slouken@0
  1398
slouken@1895
  1399
    return (0);
slouken@0
  1400
}
slouken@0
  1401
slouken@1895
  1402
int
slouken@1895
  1403
SDL_RLESurface(SDL_Surface * surface)
slouken@0
  1404
{
slouken@2266
  1405
    int flags;
slouken@0
  1406
slouken@1895
  1407
    /* Clear any previous RLE conversion */
slouken@1895
  1408
    if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
slouken@1895
  1409
        SDL_UnRLESurface(surface, 1);
slouken@1895
  1410
    }
slouken@0
  1411
slouken@1895
  1412
    /* We don't support RLE encoding of bitmaps */
slouken@1895
  1413
    if (surface->format->BitsPerPixel < 8) {
slouken@2266
  1414
        return -1;
slouken@1895
  1415
    }
slouken@0
  1416
slouken@2266
  1417
    /* Make sure the pixels are available */
slouken@2266
  1418
    if (!surface->pixels) {
slouken@2266
  1419
        return -1;
slouken@2266
  1420
    }
slouken@2266
  1421
slouken@2266
  1422
    /* If we don't have colorkey or blending, nothing to do... */
slouken@2266
  1423
    flags = surface->map->info.flags;
slouken@2267
  1424
    if (!(flags & (SDL_COPY_COLORKEY | SDL_COPY_BLEND))) {
slouken@2266
  1425
        return -1;
slouken@1895
  1426
    }
slouken@0
  1427
slouken@2266
  1428
    /* Pass on combinations not supported */
slouken@2266
  1429
    if ((flags & SDL_COPY_MODULATE_COLOR) ||
slouken@2824
  1430
        ((flags & SDL_COPY_MODULATE_ALPHA) && surface->format->Amask) ||
slouken@5184
  1431
        (flags & (SDL_COPY_ADD | SDL_COPY_MOD)) ||
slouken@2266
  1432
        (flags & SDL_COPY_NEAREST)) {
slouken@2266
  1433
        return -1;
slouken@1895
  1434
    }
slouken@0
  1435
slouken@2266
  1436
    /* Encode and set up the blit */
slouken@2266
  1437
    if (!surface->format->Amask || !(flags & SDL_COPY_BLEND)) {
slouken@2266
  1438
        if (!surface->map->identity) {
slouken@2266
  1439
            return -1;
slouken@2266
  1440
        }
slouken@2266
  1441
        if (RLEColorkeySurface(surface) < 0) {
slouken@2266
  1442
            return -1;
slouken@2266
  1443
        }
slouken@2266
  1444
        surface->map->blit = SDL_RLEBlit;
slouken@2266
  1445
        surface->map->info.flags |= SDL_COPY_RLE_COLORKEY;
slouken@2266
  1446
    } else {
slouken@2266
  1447
        if (RLEAlphaSurface(surface) < 0) {
slouken@2266
  1448
            return -1;
slouken@2266
  1449
        }
slouken@2266
  1450
        surface->map->blit = SDL_RLEAlphaBlit;
slouken@2266
  1451
        surface->map->info.flags |= SDL_COPY_RLE_ALPHAKEY;
slouken@1895
  1452
    }
slouken@0
  1453
slouken@1895
  1454
    /* The surface is now accelerated */
slouken@1895
  1455
    surface->flags |= SDL_RLEACCEL;
slouken@0
  1456
slouken@1895
  1457
    return (0);
slouken@0
  1458
}
slouken@0
  1459
slouken@0
  1460
/*
slouken@0
  1461
 * Un-RLE a surface with pixel alpha
slouken@0
  1462
 * This may not give back exactly the image before RLE-encoding; all
philipp@7128
  1463
 * completely transparent pixels will be lost, and color and alpha depth
slouken@0
  1464
 * may have been reduced (when encoding for 16bpp targets).
slouken@0
  1465
 */
slouken@1895
  1466
static SDL_bool
slouken@1895
  1467
UnRLEAlpha(SDL_Surface * surface)
slouken@0
  1468
{
slouken@0
  1469
    Uint8 *srcbuf;
slouken@0
  1470
    Uint32 *dst;
slouken@0
  1471
    SDL_PixelFormat *sf = surface->format;
slouken@2257
  1472
    RLEDestFormat *df = surface->map->data;
slouken@1895
  1473
    int (*uncopy_opaque) (Uint32 *, void *, int,
slouken@1895
  1474
                          RLEDestFormat *, SDL_PixelFormat *);
slouken@1895
  1475
    int (*uncopy_transl) (Uint32 *, void *, int,
slouken@1895
  1476
                          RLEDestFormat *, SDL_PixelFormat *);
slouken@0
  1477
    int w = surface->w;
slouken@0
  1478
    int bpp = df->BytesPerPixel;
slouken@0
  1479
slouken@1895
  1480
    if (bpp == 2) {
slouken@1895
  1481
        uncopy_opaque = uncopy_opaque_16;
slouken@1895
  1482
        uncopy_transl = uncopy_transl_16;
slouken@0
  1483
    } else {
slouken@1895
  1484
        uncopy_opaque = uncopy_transl = uncopy_32;
slouken@0
  1485
    }
slouken@0
  1486
slouken@1336
  1487
    surface->pixels = SDL_malloc(surface->h * surface->pitch);
slouken@1895
  1488
    if (!surface->pixels) {
slouken@1895
  1489
        return (SDL_FALSE);
slouken@944
  1490
    }
slouken@0
  1491
    /* fill background with transparent pixels */
slouken@1336
  1492
    SDL_memset(surface->pixels, 0, surface->h * surface->pitch);
slouken@0
  1493
slouken@0
  1494
    dst = surface->pixels;
slouken@1895
  1495
    srcbuf = (Uint8 *) (df + 1);
slouken@1895
  1496
    for (;;) {
slouken@1895
  1497
        /* copy opaque pixels */
slouken@1895
  1498
        int ofs = 0;
slouken@1895
  1499
        do {
slouken@1895
  1500
            unsigned run;
slouken@1895
  1501
            if (bpp == 2) {
slouken@1895
  1502
                ofs += srcbuf[0];
slouken@1895
  1503
                run = srcbuf[1];
slouken@1895
  1504
                srcbuf += 2;
slouken@1895
  1505
            } else {
slouken@1895
  1506
                ofs += ((Uint16 *) srcbuf)[0];
slouken@1895
  1507
                run = ((Uint16 *) srcbuf)[1];
slouken@1895
  1508
                srcbuf += 4;
slouken@1895
  1509
            }
slouken@1895
  1510
            if (run) {
slouken@1895
  1511
                srcbuf += uncopy_opaque(dst + ofs, srcbuf, run, df, sf);
slouken@1895
  1512
                ofs += run;
slouken@1895
  1513
            } else if (!ofs)
slouken@1895
  1514
                return (SDL_TRUE);
slouken@2735
  1515
        } while (ofs < w);
slouken@0
  1516
slouken@1895
  1517
        /* skip padding if needed */
slouken@1895
  1518
        if (bpp == 2)
slouken@1895
  1519
            srcbuf += (uintptr_t) srcbuf & 2;
slouken@1895
  1520
slouken@1895
  1521
        /* copy translucent pixels */
slouken@1895
  1522
        ofs = 0;
slouken@1895
  1523
        do {
slouken@1895
  1524
            unsigned run;
slouken@1895
  1525
            ofs += ((Uint16 *) srcbuf)[0];
slouken@1895
  1526
            run = ((Uint16 *) srcbuf)[1];
slouken@1895
  1527
            srcbuf += 4;
slouken@1895
  1528
            if (run) {
slouken@1895
  1529
                srcbuf += uncopy_transl(dst + ofs, srcbuf, run, df, sf);
slouken@1895
  1530
                ofs += run;
slouken@1895
  1531
            }
slouken@2735
  1532
        } while (ofs < w);
slouken@1895
  1533
        dst += surface->pitch >> 2;
slouken@0
  1534
    }
slouken@944
  1535
    /* Make the compiler happy */
slouken@1895
  1536
    return (SDL_TRUE);
slouken@0
  1537
}
slouken@0
  1538
slouken@1895
  1539
void
slouken@1895
  1540
SDL_UnRLESurface(SDL_Surface * surface, int recode)
slouken@0
  1541
{
slouken@2266
  1542
    if (surface->flags & SDL_RLEACCEL) {
slouken@1895
  1543
        surface->flags &= ~SDL_RLEACCEL;
slouken@0
  1544
slouken@2222
  1545
        if (recode && !(surface->flags & SDL_PREALLOC)) {
slouken@2266
  1546
            if (surface->map->info.flags & SDL_COPY_RLE_COLORKEY) {
slouken@1895
  1547
                SDL_Rect full;
slouken@0
  1548
slouken@1895
  1549
                /* re-create the original surface */
slouken@1895
  1550
                surface->pixels = SDL_malloc(surface->h * surface->pitch);
slouken@1895
  1551
                if (!surface->pixels) {
slouken@1895
  1552
                    /* Oh crap... */
slouken@1895
  1553
                    surface->flags |= SDL_RLEACCEL;
slouken@1895
  1554
                    return;
slouken@1895
  1555
                }
slouken@0
  1556
philipp@7128
  1557
                /* fill it with the background color */
slouken@2262
  1558
                SDL_FillRect(surface, NULL, surface->map->info.colorkey);
slouken@0
  1559
slouken@1895
  1560
                /* now render the encoded surface */
slouken@1895
  1561
                full.x = full.y = 0;
slouken@1895
  1562
                full.w = surface->w;
slouken@1895
  1563
                full.h = surface->h;
slouken@1895
  1564
                SDL_RLEBlit(surface, &full, surface, &full);
slouken@1895
  1565
            } else {
slouken@1895
  1566
                if (!UnRLEAlpha(surface)) {
slouken@1895
  1567
                    /* Oh crap... */
slouken@1895
  1568
                    surface->flags |= SDL_RLEACCEL;
slouken@1895
  1569
                    return;
slouken@1895
  1570
                }
slouken@1895
  1571
            }
slouken@1895
  1572
        }
slouken@2267
  1573
        surface->map->info.flags &=
slouken@2798
  1574
            ~(SDL_COPY_RLE_COLORKEY | SDL_COPY_RLE_ALPHAKEY);
slouken@1895
  1575
slouken@7719
  1576
        SDL_free(surface->map->data);
slouken@7719
  1577
        surface->map->data = NULL;
slouken@0
  1578
    }
slouken@0
  1579
}
slouken@0
  1580
slouken@1895
  1581
/* vi: set ts=4 sw=4 expandtab: */