SDL_blit_1.c File Reference

#include "../SDL_internal.h"
#include "SDL_video.h"
#include "SDL_blit.h"
#include "SDL_sysvideo.h"
#include "SDL_endian.h"

Include dependency graph for SDL_blit_1.c:

Go to the source code of this file.

Functions
static void	Blit1to1 (SDL_BlitInfo *info)
static void	Blit1to2 (SDL_BlitInfo *info)
static void	Blit1to3 (SDL_BlitInfo *info)
static void	Blit1to4 (SDL_BlitInfo *info)
static void	Blit1to1Key (SDL_BlitInfo *info)
static void	Blit1to2Key (SDL_BlitInfo *info)
static void	Blit1to3Key (SDL_BlitInfo *info)
static void	Blit1to4Key (SDL_BlitInfo *info)
static void	Blit1toNAlpha (SDL_BlitInfo *info)
static void	Blit1toNAlphaKey (SDL_BlitInfo *info)
SDL_BlitFunc	SDL_CalculateBlit1 (SDL_Surface *surface)

Variables
static const SDL_BlitFunc	one_blit []
static const SDL_BlitFunc	one_blitkey []

Function Documentation

static void Blit1to1 ( SDL_BlitInfo *  info )

static

Definition at line 31 of file SDL_blit_1.c.

References SDL_BlitInfo::dst, SDL_BlitInfo::dst_h, SDL_BlitInfo::dst_skip, SDL_BlitInfo::dst_w, DUFFS_LOOP, map, SDL_BlitInfo::src, SDL_BlitInfo::src_skip, and SDL_BlitInfo::table.

{
#ifndef USE_DUFFS_LOOP
    int c;
#endif
    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;

    while (height--) {
#ifdef USE_DUFFS_LOOP
        /* *INDENT-OFF* */
        DUFFS_LOOP(
            {
              *dst = map[*src];
            }
            dst++;
            src++;
        , width);
        /* *INDENT-ON* */
#else
        for (c = width; c; --c) {
            *dst = map[*src];
            dst++;
            src++;
        }
#endif
        src += srcskip;
        dst += dstskip;
    }
}

static void Blit1to1Key ( SDL_BlitInfo *  info )

static

Definition at line 287 of file SDL_blit_1.c.

References SDL_BlitInfo::colorkey, SDL_BlitInfo::dst, SDL_BlitInfo::dst_h, SDL_BlitInfo::dst_skip, SDL_BlitInfo::dst_w, DUFFS_LOOP, SDL_BlitInfo::src, SDL_BlitInfo::src_skip, and SDL_BlitInfo::table.

{
    int width = info->dst_w;
    int height = info->dst_h;
    Uint8 *src = info->src;
    int srcskip = info->src_skip;
    Uint8 *dst = info->dst;
    int dstskip = info->dst_skip;
    Uint8 *palmap = info->table;
    Uint32 ckey = info->colorkey;

    if (palmap) {
        while (height--) {
            /* *INDENT-OFF* */
            DUFFS_LOOP(
            {
                if ( *src != ckey ) {
                  *dst = palmap[*src];
                }
                dst++;
                src++;
            },
            width);
            /* *INDENT-ON* */
            src += srcskip;
            dst += dstskip;
        }
    } else {
        while (height--) {
            /* *INDENT-OFF* */
            DUFFS_LOOP(
            {
                if ( *src != ckey ) {
                  *dst = *src;
                }
                dst++;
                src++;
            },
            width);
            /* *INDENT-ON* */
            src += srcskip;
            dst += dstskip;
        }
    }
}

static void Blit1to2 ( SDL_BlitInfo *  info )

static

Definition at line 83 of file SDL_blit_1.c.

References SDL_BlitInfo::dst, SDL_BlitInfo::dst_h, SDL_BlitInfo::dst_skip, SDL_BlitInfo::dst_w, DUFFS_LOOP, HI, LO, map, SDL_BlitInfo::src, SDL_BlitInfo::src_skip, SDL_BlitInfo::table, and USE_DUFFS_LOOP.

{
#ifndef USE_DUFFS_LOOP
    int c;
#endif
    int width, height;
    Uint8 *src, *dst;
    Uint16 *map;
    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 = (Uint16 *) info->table;

#ifdef USE_DUFFS_LOOP
    while (height--) {
        /* *INDENT-OFF* */
        DUFFS_LOOP(
        {
            *(Uint16 *)dst = map[*src++];
            dst += 2;
        },
        width);
        /* *INDENT-ON* */
        src += srcskip;
        dst += dstskip;
    }
#else
    /* Memory align at 4-byte boundary, if necessary */
    if ((long) dst & 0x03) {
        /* Don't do anything if width is 0 */
        if (width == 0) {
            return;
        }
        --width;

        while (height--) {
            /* Perform copy alignment */
            *(Uint16 *) dst = map[*src++];
            dst += 2;

            /* Copy in 4 pixel chunks */
            for (c = width / 4; c; --c) {
                *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
                src += 2;
                dst += 4;
                *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
                src += 2;
                dst += 4;
            }
            /* Get any leftovers */
            switch (width & 3) {
            case 3:
                *(Uint16 *) dst = map[*src++];
                dst += 2;
            case 2:
                *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
                src += 2;
                dst += 4;
                break;
            case 1:
                *(Uint16 *) dst = map[*src++];
                dst += 2;
                break;
            }
            src += srcskip;
            dst += dstskip;
        }
    } else {
        while (height--) {
            /* Copy in 4 pixel chunks */
            for (c = width / 4; c; --c) {
                *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
                src += 2;
                dst += 4;
                *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
                src += 2;
                dst += 4;
            }
            /* Get any leftovers */
            switch (width & 3) {
            case 3:
                *(Uint16 *) dst = map[*src++];
                dst += 2;
            case 2:
                *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
                src += 2;
                dst += 4;
                break;
            case 1:
                *(Uint16 *) dst = map[*src++];
                dst += 2;
                break;
            }
            src += srcskip;
            dst += dstskip;
        }
    }
#endif /* USE_DUFFS_LOOP */
}

static void Blit1to2Key ( SDL_BlitInfo *  info )

static

Definition at line 334 of file SDL_blit_1.c.

References SDL_BlitInfo::colorkey, SDL_BlitInfo::dst, SDL_BlitInfo::dst_h, SDL_BlitInfo::dst_skip, SDL_BlitInfo::dst_w, DUFFS_LOOP, SDL_BlitInfo::src, SDL_BlitInfo::src_skip, and SDL_BlitInfo::table.

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

    /* Set up some basic variables */
    dstskip /= 2;

    while (height--) {
        /* *INDENT-OFF* */
        DUFFS_LOOP(
        {
            if ( *src != ckey ) {
                *dstp=palmap[*src];
            }
            src++;
            dstp++;
        },
        width);
        /* *INDENT-ON* */
        src += srcskip;
        dstp += dstskip;
    }
}

static void Blit1to3 ( SDL_BlitInfo *  info )

static

Definition at line 190 of file SDL_blit_1.c.

References SDL_BlitInfo::dst, SDL_BlitInfo::dst_h, SDL_BlitInfo::dst_skip, SDL_BlitInfo::dst_w, DUFFS_LOOP, map, SDL_BlitInfo::src, SDL_BlitInfo::src_skip, and SDL_BlitInfo::table.

{
#ifndef USE_DUFFS_LOOP
    int c;
#endif
    int 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;

    while (height--) {
#ifdef USE_DUFFS_LOOP
        /* *INDENT-OFF* */
        DUFFS_LOOP(
            {
                o = *src * 4;
                dst[0] = map[o++];
                dst[1] = map[o++];
                dst[2] = map[o++];
            }
            src++;
            dst += 3;
        , width);
        /* *INDENT-ON* */
#else
        for (c = width; c; --c) {
            o = *src * 4;
            dst[0] = map[o++];
            dst[1] = map[o++];
            dst[2] = map[o++];
            src++;
            dst += 3;
        }
#endif /* USE_DUFFS_LOOP */
        src += srcskip;
        dst += dstskip;
    }
}

static void Blit1to3Key ( SDL_BlitInfo *  info )

static

Definition at line 366 of file SDL_blit_1.c.

References SDL_BlitInfo::colorkey, SDL_BlitInfo::dst, SDL_BlitInfo::dst_h, SDL_BlitInfo::dst_skip, SDL_BlitInfo::dst_w, DUFFS_LOOP, SDL_BlitInfo::src, SDL_BlitInfo::src_skip, and SDL_BlitInfo::table.

{
    int width = info->dst_w;
    int height = info->dst_h;
    Uint8 *src = info->src;
    int srcskip = info->src_skip;
    Uint8 *dst = info->dst;
    int dstskip = info->dst_skip;
    Uint8 *palmap = info->table;
    Uint32 ckey = info->colorkey;
    int o;

    while (height--) {
        /* *INDENT-OFF* */
        DUFFS_LOOP(
        {
            if ( *src != ckey ) {
                o = *src * 4;
                dst[0] = palmap[o++];
                dst[1] = palmap[o++];
                dst[2] = palmap[o++];
            }
            src++;
            dst += 3;
        },
        width);
        /* *INDENT-ON* */
        src += srcskip;
        dst += dstskip;
    }
}

static void Blit1to4 ( SDL_BlitInfo *  info )

static

Definition at line 239 of file SDL_blit_1.c.

References SDL_BlitInfo::dst, SDL_BlitInfo::dst_h, SDL_BlitInfo::dst_skip, SDL_BlitInfo::dst_w, DUFFS_LOOP, map, SDL_BlitInfo::src, SDL_BlitInfo::src_skip, and SDL_BlitInfo::table.

{
#ifndef USE_DUFFS_LOOP
    int c;
#endif
    int width, height;
    Uint8 *src;
    Uint32 *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 = (Uint32 *) info->dst;
    dstskip = info->dst_skip / 4;
    map = (Uint32 *) info->table;

    while (height--) {
#ifdef USE_DUFFS_LOOP
        /* *INDENT-OFF* */
        DUFFS_LOOP(
            *dst++ = map[*src++];
        , width);
        /* *INDENT-ON* */
#else
        for (c = width / 4; c; --c) {
            *dst++ = map[*src++];
            *dst++ = map[*src++];
            *dst++ = map[*src++];
            *dst++ = map[*src++];
        }
        switch (width & 3) {
        case 3:
            *dst++ = map[*src++];
        case 2:
            *dst++ = map[*src++];
        case 1:
            *dst++ = map[*src++];
        }
#endif /* USE_DUFFS_LOOP */
        src += srcskip;
        dst += dstskip;
    }
}

static void Blit1to4Key ( SDL_BlitInfo *  info )

static

Definition at line 399 of file SDL_blit_1.c.

References SDL_BlitInfo::colorkey, SDL_BlitInfo::dst, SDL_BlitInfo::dst_h, SDL_BlitInfo::dst_skip, SDL_BlitInfo::dst_w, DUFFS_LOOP, SDL_BlitInfo::src, SDL_BlitInfo::src_skip, and SDL_BlitInfo::table.

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

    /* Set up some basic variables */
    dstskip /= 4;

    while (height--) {
        /* *INDENT-OFF* */
        DUFFS_LOOP(
        {
            if ( *src != ckey ) {
                *dstp = palmap[*src];
            }
            src++;
            dstp++;
        },
        width);
        /* *INDENT-ON* */
        src += srcskip;
        dstp += dstskip;
    }
}

static void Blit1toNAlpha ( SDL_BlitInfo *  info )

static

Definition at line 431 of file SDL_blit_1.c.

References SDL_BlitInfo::a, ALPHA_BLEND_RGBA, ASSEMBLE_RGBA, SDL_Color::b, SDL_PixelFormat::BytesPerPixel, SDL_Palette::colors, DISEMBLE_RGBA, SDL_BlitInfo::dst, SDL_BlitInfo::dst_fmt, SDL_BlitInfo::dst_h, SDL_BlitInfo::dst_skip, SDL_BlitInfo::dst_w, DUFFS_LOOP4, SDL_Color::g, SDL_PixelFormat::palette, SDL_Color::r, SDL_BlitInfo::src, SDL_BlitInfo::src_fmt, and SDL_BlitInfo::src_skip.

Referenced by SDL_CalculateBlit1().

{
    int width = info->dst_w;
    int height = info->dst_h;
    Uint8 *src = info->src;
    int srcskip = info->src_skip;
    Uint8 *dst = info->dst;
    int dstskip = info->dst_skip;
    SDL_PixelFormat *dstfmt = info->dst_fmt;
    const SDL_Color *srcpal = info->src_fmt->palette->colors;
    int dstbpp;
    Uint32 pixel;
    unsigned sR, sG, sB;
    unsigned dR, dG, dB, dA;
    const unsigned A = info->a;

    /* Set up some basic variables */
    dstbpp = dstfmt->BytesPerPixel;

    while (height--) {
        /* *INDENT-OFF* */
        DUFFS_LOOP4(
        {
            sR = srcpal[*src].r;
            sG = srcpal[*src].g;
            sB = srcpal[*src].b;
            DISEMBLE_RGBA(dst, dstbpp, dstfmt, pixel, dR, dG, dB, dA);
            ALPHA_BLEND_RGBA(sR, sG, sB, A, dR, dG, dB, dA);
            ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA);
            src++;
            dst += dstbpp;
        },
        width);
        /* *INDENT-ON* */
        src += srcskip;
        dst += dstskip;
    }
}

static void Blit1toNAlphaKey ( SDL_BlitInfo *  info )

static

Definition at line 471 of file SDL_blit_1.c.

References SDL_BlitInfo::a, ALPHA_BLEND_RGBA, ASSEMBLE_RGBA, SDL_Color::b, SDL_PixelFormat::BytesPerPixel, SDL_BlitInfo::colorkey, SDL_Palette::colors, DISEMBLE_RGBA, SDL_BlitInfo::dst, SDL_BlitInfo::dst_fmt, SDL_BlitInfo::dst_h, SDL_BlitInfo::dst_skip, SDL_BlitInfo::dst_w, DUFFS_LOOP, SDL_Color::g, SDL_PixelFormat::palette, SDL_Color::r, SDL_BlitInfo::src, SDL_BlitInfo::src_fmt, and SDL_BlitInfo::src_skip.

Referenced by SDL_CalculateBlit1().

{
    int width = info->dst_w;
    int height = info->dst_h;
    Uint8 *src = info->src;
    int srcskip = info->src_skip;
    Uint8 *dst = info->dst;
    int dstskip = info->dst_skip;
    SDL_PixelFormat *dstfmt = info->dst_fmt;
    const SDL_Color *srcpal = info->src_fmt->palette->colors;
    Uint32 ckey = info->colorkey;
    int dstbpp;
    Uint32 pixel;
    unsigned sR, sG, sB;
    unsigned dR, dG, dB, dA;
    const unsigned A = info->a;

    /* Set up some basic variables */
    dstbpp = dstfmt->BytesPerPixel;

    while (height--) {
        /* *INDENT-OFF* */
        DUFFS_LOOP(
        {
            if ( *src != ckey ) {
                sR = srcpal[*src].r;
                sG = srcpal[*src].g;
                sB = srcpal[*src].b;
                DISEMBLE_RGBA(dst, dstbpp, dstfmt, pixel, dR, dG, dB, dA);
                ALPHA_BLEND_RGBA(sR, sG, sB, A, dR, dG, dB, dA);
                  ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA);
            }
            src++;
            dst += dstbpp;
        },
        width);
        /* *INDENT-ON* */
        src += srcskip;
        dst += dstskip;
    }
}

SDL_BlitFunc SDL_CalculateBlit1

(

SDL_Surface *

surface

)

Definition at line 522 of file SDL_blit_1.c.

References SDL_PixelFormat::BitsPerPixel, Blit1toNAlpha(), Blit1toNAlphaKey(), SDL_PixelFormat::BytesPerPixel, SDL_BlitMap::dst, SDL_BlitInfo::flags, SDL_Surface::format, SDL_BlitMap::info, SDL_Surface::map, NULL, one_blit, SDL_COPY_BLEND, SDL_COPY_COLORKEY, SDL_COPY_MODULATE_ALPHA, and SDL_COPY_RLE_MASK.

Referenced by SDL_CalculateBlit().

{
    int which;
    SDL_PixelFormat *dstfmt;

    dstfmt = surface->map->dst->format;
    if (dstfmt->BitsPerPixel < 8) {
        which = 0;
    } else {
        which = dstfmt->BytesPerPixel;
    }
    switch (surface->map->info.flags & ~SDL_COPY_RLE_MASK) {
    case 0:
        return one_blit[which];

    case SDL_COPY_COLORKEY:
        return one_blitkey[which];

    case SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
        /* Supporting 8bpp->8bpp alpha is doable but requires lots of
           tables which consume space and takes time to precompute,
           so is better left to the user */
        return which >= 2 ? Blit1toNAlpha : (SDL_BlitFunc) NULL;

    case SDL_COPY_COLORKEY | SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
        return which >= 2 ? Blit1toNAlphaKey : (SDL_BlitFunc) NULL;
    }
    return (SDL_BlitFunc) NULL;
}

Variable Documentation

const SDL_BlitFunc one_blit[]

static

Initial value:

 {
    (SDL_BlitFunc) NULL, Blit1to1, Blit1to2, Blit1to3, Blit1to4
}

Definition at line 513 of file SDL_blit_1.c.

Referenced by SDL_CalculateBlit1().

const SDL_BlitFunc one_blitkey[]

static

Initial value:

 {
    (SDL_BlitFunc) NULL, Blit1to1Key, Blit1to2Key, Blit1to3Key, Blit1to4Key
}

Definition at line 517 of file SDL_blit_1.c.