Mercurial > sdl-ios-xcode

view src/video/SDL_blit_0.c @ 3415:1756b9569141

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Adam Strzelecki to SDL Actually after my patch commited in r4928 MinGW configure seems to generate broken Makefile due MSYS bash bug. (Attaching cure/patch below) The problem is that: TEST=`echo 'one\\ two\\ three\\'` echo "$TEST" Should echo: one\ two\ three\ Does it on Linux, Mac.. all UNIX but not on MSYS (MinGW) which outputs: one\two\three\ (new lines removed, probably it doesn't like backslashes) Probably this bug should be submitted to MSYS team, but not waiting till MSYS gets it fixed (they have very slow release cycles) here goes simple cure... My patch simply replaces single quoted SED rules where we needed newlien injection with double quoted ones. Tested on Mac, Linux & MinGW. Please review it ASAP coz this may be showstopper for everybody compiling with MinGW.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 28 Oct 2009 04:27:50 +0000
parents dc1eb82ffdaa
children f7b03b6838cb
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#include "SDL_video.h"
#include "SDL_blit.h"

/* Functions to blit from bitmaps to other surfaces */

static void
BlitBto1(SDL_BlitInfo * info)
{
    int c;
    int width, height;
    Uint8 *src, *map, *dst;
    int srcskip, dstskip;

    /* Set up some basic variables */
    width = info->dst_w;
    height = info->dst_h;
    src = info->src;
    srcskip = info->src_skip;
    dst = info->dst;
    dstskip = info->dst_skip;
    map = info->table;
    srcskip += width - (width + 7) / 8;

    if (map) {
        while (height--) {
            Uint8 byte = 0, bit;
            for (c = 0; c < width; ++c) {
                if ((c & 7) == 0) {
                    byte = *src++;
                }
                bit = (byte & 0x80) >> 7;
                if (1) {
                    *dst = map[bit];
                }
                dst++;
                byte <<= 1;
            }
            src += srcskip;
            dst += dstskip;
        }
    } else {
        while (height--) {
            Uint8 byte = 0, bit;
            for (c = 0; c < width; ++c) {
                if ((c & 7) == 0) {
                    byte = *src++;
                }
                bit = (byte & 0x80) >> 7;
                if (1) {
                    *dst = bit;
                }
                dst++;
                byte <<= 1;
            }
            src += srcskip;
            dst += dstskip;
        }
    }
}

static void
BlitBto2(SDL_BlitInfo * info)
{
    int c;
    int width, height;
    Uint8 *src;
    Uint16 *map, *dst;
    int srcskip, dstskip;

    /* Set up some basic variables */
    width = info->dst_w;
    height = info->dst_h;
    src = info->src;
    srcskip = info->src_skip;
    dst = (Uint16 *) info->dst;
    dstskip = info->dst_skip / 2;
    map = (Uint16 *) info->table;
    srcskip += width - (width + 7) / 8;

    while (height--) {
        Uint8 byte = 0, bit;
        for (c = 0; c < width; ++c) {
            if ((c & 7) == 0) {
                byte = *src++;
            }
            bit = (byte & 0x80) >> 7;
            if (1) {
                *dst = map[bit];
            }
            byte <<= 1;
            dst++;
        }
        src += srcskip;
        dst += dstskip;
    }
}

static void
BlitBto3(SDL_BlitInfo * info)
{
    int c, o;
    int width, height;
    Uint8 *src, *map, *dst;
    int srcskip, dstskip;

    /* Set up some basic variables */
    width = info->dst_w;
    height = info->dst_h;
    src = info->src;
    srcskip = info->src_skip;
    dst = info->dst;
    dstskip = info->dst_skip;
    map = info->table;
    srcskip += width - (width + 7) / 8;

    while (height--) {
        Uint8 byte = 0, bit;
        for (c = 0; c < width; ++c) {
            if ((c & 7) == 0) {
                byte = *src++;
            }
            bit = (byte & 0x80) >> 7;
            if (1) {
                o = bit * 4;
                dst[0] = map[o++];
                dst[1] = map[o++];
                dst[2] = map[o++];
            }
            byte <<= 1;
            dst += 3;
        }
        src += srcskip;
        dst += dstskip;
    }
}

static void
BlitBto4(SDL_BlitInfo * info)
{
    int width, height;
    Uint8 *src;
    Uint32 *map, *dst;
    int srcskip, dstskip;
    int c;

    /* Set up some basic variables */
    width = info->dst_w;
    height = info->dst_h;
    src = info->src;
    srcskip = info->src_skip;
    dst = (Uint32 *) info->dst;
    dstskip = info->dst_skip / 4;
    map = (Uint32 *) info->table;
    srcskip += width - (width + 7) / 8;

    while (height--) {
        Uint8 byte = 0, bit;
        for (c = 0; c < width; ++c) {
            if ((c & 7) == 0) {
                byte = *src++;
            }
            bit = (byte & 0x80) >> 7;
            if (1) {
                *dst = map[bit];
            }
            byte <<= 1;
            dst++;
        }
        src += srcskip;
        dst += dstskip;
    }
}

static void
BlitBto1Key(SDL_BlitInfo * info)
{
    int width = info->dst_w;
    int height = info->dst_h;
    Uint8 *src = info->src;
    Uint8 *dst = info->dst;
    int srcskip = info->src_skip;
    int dstskip = info->dst_skip;
    Uint32 ckey = info->colorkey;
    Uint8 *palmap = info->table;
    int c;

    /* Set up some basic variables */
    srcskip += width - (width + 7) / 8;

    if (palmap) {
        while (height--) {
            Uint8 byte = 0, bit;
            for (c = 0; c < width; ++c) {
                if ((c & 7) == 0) {
                    byte = *src++;
                }
                bit = (byte & 0x80) >> 7;
                if (bit != ckey) {
                    *dst = palmap[bit];
                }
                dst++;
                byte <<= 1;
            }
            src += srcskip;
            dst += dstskip;
        }
    } else {
        while (height--) {
            Uint8 byte = 0, bit;
            for (c = 0; c < width; ++c) {
                if ((c & 7) == 0) {
                    byte = *src++;
                }
                bit = (byte & 0x80) >> 7;
                if (bit != ckey) {
                    *dst = bit;
                }
                dst++;
                byte <<= 1;
            }
            src += srcskip;
            dst += dstskip;
        }
    }
}

static void
BlitBto2Key(SDL_BlitInfo * info)
{
    int width = info->dst_w;
    int height = info->dst_h;
    Uint8 *src = info->src;
    Uint16 *dstp = (Uint16 *) info->dst;
    int srcskip = info->src_skip;
    int dstskip = info->dst_skip;
    Uint32 ckey = info->colorkey;
    Uint8 *palmap = info->table;
    int c;

    /* Set up some basic variables */
    srcskip += width - (width + 7) / 8;
    dstskip /= 2;

    while (height--) {
        Uint8 byte = 0, bit;
        for (c = 0; c < width; ++c) {
            if ((c & 7) == 0) {
                byte = *src++;
            }
            bit = (byte & 0x80) >> 7;
            if (bit != ckey) {
                *dstp = ((Uint16 *) palmap)[bit];
            }
            byte <<= 1;
            dstp++;
        }
        src += srcskip;
        dstp += dstskip;
    }
}

static void
BlitBto3Key(SDL_BlitInfo * info)
{
    int width = info->dst_w;
    int height = info->dst_h;
    Uint8 *src = info->src;
    Uint8 *dst = info->dst;
    int srcskip = info->src_skip;
    int dstskip = info->dst_skip;
    Uint32 ckey = info->colorkey;
    Uint8 *palmap = info->table;
    int c;

    /* Set up some basic variables */
    srcskip += width - (width + 7) / 8;

    while (height--) {
        Uint8 byte = 0, bit;
        for (c = 0; c < width; ++c) {
            if ((c & 7) == 0) {
                byte = *src++;
            }
            bit = (byte & 0x80) >> 7;
            if (bit != ckey) {
                SDL_memcpy(dst, &palmap[bit * 4], 3);
            }
            byte <<= 1;
            dst += 3;
        }
        src += srcskip;
        dst += dstskip;
    }
}

static void
BlitBto4Key(SDL_BlitInfo * info)
{
    int width = info->dst_w;
    int height = info->dst_h;
    Uint8 *src = info->src;
    Uint32 *dstp = (Uint32 *) info->dst;
    int srcskip = info->src_skip;
    int dstskip = info->dst_skip;
    Uint32 ckey = info->colorkey;
    Uint8 *palmap = info->table;
    int c;

    /* Set up some basic variables */
    srcskip += width - (width + 7) / 8;
    dstskip /= 4;

    while (height--) {
        Uint8 byte = 0, bit;
        for (c = 0; c < width; ++c) {
            if ((c & 7) == 0) {
                byte = *src++;
            }
            bit = (byte & 0x80) >> 7;
            if (bit != ckey) {
                *dstp = ((Uint32 *) palmap)[bit];
            }
            byte <<= 1;
            dstp++;
        }
        src += srcskip;
        dstp += dstskip;
    }
}

static void
BlitBtoNAlpha(SDL_BlitInfo * info)
{
    int width = info->dst_w;
    int height = info->dst_h;
    Uint8 *src = info->src;
    Uint8 *dst = info->dst;
    int srcskip = info->src_skip;
    int dstskip = info->dst_skip;
    const SDL_Color *srcpal = info->src_fmt->palette->colors;
    SDL_PixelFormat *dstfmt = info->dst_fmt;
    int dstbpp;
    int c;
    const int A = info->a;

    /* Set up some basic variables */
    dstbpp = dstfmt->BytesPerPixel;
    srcskip += width - (width + 7) / 8;

    while (height--) {
        Uint8 byte = 0, bit;
        for (c = 0; c < width; ++c) {
            if ((c & 7) == 0) {
                byte = *src++;
            }
            bit = (byte & 0x80) >> 7;
            if (1) {
                Uint32 pixel;
                unsigned sR, sG, sB;
                unsigned dR, dG, dB;
                sR = srcpal[bit].r;
                sG = srcpal[bit].g;
                sB = srcpal[bit].b;
                DISEMBLE_RGB(dst, dstbpp, dstfmt, pixel, dR, dG, dB);
                ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
                ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
            }
            byte <<= 1;
            dst += dstbpp;
        }
        src += srcskip;
        dst += dstskip;
    }
}

static void
BlitBtoNAlphaKey(SDL_BlitInfo * info)
{
    int width = info->dst_w;
    int height = info->dst_h;
    Uint8 *src = info->src;
    Uint8 *dst = info->dst;
    int srcskip = info->src_skip;
    int dstskip = info->dst_skip;
    SDL_PixelFormat *srcfmt = info->src_fmt;
    SDL_PixelFormat *dstfmt = info->dst_fmt;
    const SDL_Color *srcpal = srcfmt->palette->colors;
    int dstbpp;
    int c;
    const int A = info->a;
    Uint32 ckey = info->colorkey;

    /* Set up some basic variables */
    dstbpp = dstfmt->BytesPerPixel;
    srcskip += width - (width + 7) / 8;

    while (height--) {
        Uint8 byte = 0, bit;
        for (c = 0; c < width; ++c) {
            if ((c & 7) == 0) {
                byte = *src++;
            }
            bit = (byte & 0x80) >> 7;
            if (bit != ckey) {
                int sR, sG, sB;
                int dR, dG, dB;
                Uint32 pixel;
                sR = srcpal[bit].r;
                sG = srcpal[bit].g;
                sB = srcpal[bit].b;
                DISEMBLE_RGB(dst, dstbpp, dstfmt, pixel, dR, dG, dB);
                ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
                ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
            }
            byte <<= 1;
            dst += dstbpp;
        }
        src += srcskip;
        dst += dstskip;
    }
}

static const SDL_BlitFunc bitmap_blit[] = {
    NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4
};

static const SDL_BlitFunc colorkey_blit[] = {
    NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key
};

SDL_BlitFunc
SDL_CalculateBlit0(SDL_Surface * surface)
{
    int which;

    if (surface->format->BitsPerPixel != 1) {
        /* We don't support sub 8-bit packed pixel modes */
        return NULL;
    }
    if (surface->map->dst->format->BitsPerPixel < 8) {
        which = 0;
    } else {
        which = surface->map->dst->format->BytesPerPixel;
    }
    switch (surface->map->info.flags & ~SDL_COPY_RLE_MASK) {
    case 0:
        return bitmap_blit[which];

    case SDL_COPY_COLORKEY:
        return colorkey_blit[which];

    case SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
        return which >= 2 ? BlitBtoNAlpha : NULL;

    case SDL_COPY_COLORKEY | SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
        return which >= 2 ? BlitBtoNAlphaKey : NULL;
    }
    return NULL;
}

/* vi: set ts=4 sw=4 expandtab: */