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view src/video/SDL_blit_0.c @ 1982:3b4ce57c6215

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First shot at new audio data types (int32 and float32). Notable changes: - Converters between types are autogenerated. Instead of making multiple passes over the data with seperate filters for endianess, size, signedness, etc, converting between data types is always one specialized filter. This simplifies SDL_BuildAudioCVT(), which otherwise had a million edge cases with the new types, and makes the actually conversions more CPU cache friendly. Left a stub for adding specific optimized versions of these routines (SSE/MMX/Altivec, assembler, etc) - Autogenerated converters are built by SDL/src/audio/sdlgenaudiocvt.pl. This does not need to be run unless tweaking the code, and thus doesn't need integration into the build system. - Went through all the drivers and tried to weed out all the "Uint16" references that are better specified with the new SDL_AudioFormat typedef. - Cleaned out a bunch of hardcoded bitwise magic numbers and replaced them with new SDL_AUDIO_* macros. - Added initial float32 and int32 support code. Theoretically, existing drivers will push these through converters to get the data they want to feed to the hardware. Still TODO: - Optimize and debug new converters. - Update the CoreAudio backend to accept float32 data directly. - Other backends, too? - SDL_LoadWAV() needs to be updated to support int32 and float32 .wav files (both of which exist and can be generated by 'sox' for testing purposes). - Update the mixer to handle new datatypes. - Optionally update SDL_sound and SDL_mixer, etc.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 24 Aug 2006 12:10:46 +0000
parents c121d94672cb
children 340942cfda48
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 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->d_width;
    height = info->d_height;
    src = info->s_pixels;
    srcskip = info->s_skip;
    dst = info->d_pixels;
    dstskip = info->d_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->d_width;
    height = info->d_height;
    src = info->s_pixels;
    srcskip = info->s_skip;
    dst = (Uint16 *) info->d_pixels;
    dstskip = info->d_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->d_width;
    height = info->d_height;
    src = info->s_pixels;
    srcskip = info->s_skip;
    dst = info->d_pixels;
    dstskip = info->d_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->d_width;
    height = info->d_height;
    src = info->s_pixels;
    srcskip = info->s_skip;
    dst = (Uint32 *) info->d_pixels;
    dstskip = info->d_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->d_width;
    int height = info->d_height;
    Uint8 *src = info->s_pixels;
    Uint8 *dst = info->d_pixels;
    int srcskip = info->s_skip;
    int dstskip = info->d_skip;
    Uint32 ckey = info->src->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->d_width;
    int height = info->d_height;
    Uint8 *src = info->s_pixels;
    Uint16 *dstp = (Uint16 *) info->d_pixels;
    int srcskip = info->s_skip;
    int dstskip = info->d_skip;
    Uint32 ckey = info->src->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->d_width;
    int height = info->d_height;
    Uint8 *src = info->s_pixels;
    Uint8 *dst = info->d_pixels;
    int srcskip = info->s_skip;
    int dstskip = info->d_skip;
    Uint32 ckey = info->src->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->d_width;
    int height = info->d_height;
    Uint8 *src = info->s_pixels;
    Uint32 *dstp = (Uint32 *) info->d_pixels;
    int srcskip = info->s_skip;
    int dstskip = info->d_skip;
    Uint32 ckey = info->src->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->d_width;
    int height = info->d_height;
    Uint8 *src = info->s_pixels;
    Uint8 *dst = info->d_pixels;
    int srcskip = info->s_skip;
    int dstskip = info->d_skip;
    const SDL_Color *srcpal = info->src->palette->colors;
    SDL_PixelFormat *dstfmt = info->dst;
    int dstbpp;
    int c;
    const int A = info->src->alpha;

    /* 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->d_width;
    int height = info->d_height;
    Uint8 *src = info->s_pixels;
    Uint8 *dst = info->d_pixels;
    int srcskip = info->s_skip;
    int dstskip = info->d_skip;
    SDL_PixelFormat *srcfmt = info->src;
    SDL_PixelFormat *dstfmt = info->dst;
    const SDL_Color *srcpal = srcfmt->palette->colors;
    int dstbpp;
    int c;
    const int A = srcfmt->alpha;
    Uint32 ckey = srcfmt->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 SDL_loblit bitmap_blit[] = {
    NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4
};

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

SDL_loblit
SDL_CalculateBlit0(SDL_Surface * surface, int blit_index)
{
    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 (blit_index) {
    case 0:                    /* copy */
        return bitmap_blit[which];

    case 1:                    /* colorkey */
        return colorkey_blit[which];

    case 2:                    /* alpha */
        return which >= 2 ? BlitBtoNAlpha : NULL;

    case 4:                    /* alpha + colorkey */
        return which >= 2 ? BlitBtoNAlphaKey : NULL;
    }
    return NULL;
}

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