src/video/cybergfx/SDL_cgximage.c

/*
    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_endian.h"
#include "SDL_cgximage_c.h"

#ifdef HAVE_KSTAT
#include <kstat.h>
#endif

#ifdef USE_CGX_WRITELUTPIXEL
#if defined(__SASC) || defined(__PPC__)
#define WLUT WriteLUTPixelArray
#else
void
WLUT(APTR a, UWORD b, UWORD c, UWORD d, struct RastPort *e, APTR f, UWORD g,
     UWORD h, UWORD i, UWORD l, UBYTE m)
{
    WriteLUTPixelArray(a, b, c, d, e, f, g, h, i, l, m);
}
#endif

#endif

/* Various screen update functions available */
static void CGX_NormalUpdate(_THIS, int numrects, SDL_Rect * rects);
static void CGX_FakeUpdate(_THIS, int numrects, SDL_Rect * rects);

BOOL SafeDisp = TRUE, SafeChange = TRUE;
struct MsgPort *safeport = NULL, *dispport = NULL;
ULONG safe_sigbit, disp_sigbit;
int use_picasso96 = 1;

int
CGX_SetupImage(_THIS, SDL_Surface * screen)
{
    SDL_Ximage = NULL;

    if (screen->flags & SDL_HWSURFACE) {
        ULONG pitch;

        if (!screen->hwdata) {
            if (!(screen->hwdata = SDL_malloc(sizeof(struct private_hwdata))))
                return -1;

            D(bug("Creating system accel struct\n"));
        }
        screen->hwdata->lock = NULL;
        screen->hwdata->allocated = 0;
        screen->hwdata->mask = NULL;
        screen->hwdata->bmap = SDL_RastPort->BitMap;
        screen->hwdata->videodata = this;

        if (!(screen->hwdata->lock = LockBitMapTags(screen->hwdata->bmap,
                                                    LBMI_BASEADDRESS,
                                                    (ULONG) & screen->
                                                    pixels,
                                                    LBMI_BYTESPERROW,
                                                    (ULONG) & pitch,
                                                    TAG_DONE))) {
            SDL_free(screen->hwdata);
            screen->hwdata = NULL;
            return -1;
        } else {
            UnLockBitMap(screen->hwdata->lock);
            screen->hwdata->lock = NULL;
        }

        screen->pitch = pitch;

        this->UpdateRects = CGX_FakeUpdate;

        D(bug
          ("Accel video image configured (%lx, pitch %ld).\n",
           screen->pixels, screen->pitch));
        return 0;
    }

    screen->pixels = SDL_malloc(screen->h * screen->pitch);

    if (screen->pixels == NULL) {
        SDL_OutOfMemory();
        return (-1);
    }

    SDL_Ximage = screen->pixels;

    if (SDL_Ximage == NULL) {
        SDL_SetError("Couldn't create XImage");
        return (-1);
    }

    this->UpdateRects = CGX_NormalUpdate;

    return (0);
}

void
CGX_DestroyImage(_THIS, SDL_Surface * screen)
{
    if (SDL_Ximage) {
        SDL_free(SDL_Ximage);
        SDL_Ximage = NULL;
    }
    if (screen) {
        screen->pixels = NULL;

        if (screen->hwdata) {
            SDL_free(screen->hwdata);
            screen->hwdata = NULL;
        }
    }
}

/* This is a hack to see whether this system has more than 1 CPU */
static int
num_CPU(void)
{
    return 1;
}

int
CGX_ResizeImage(_THIS, SDL_Surface * screen, Uint32 flags)
{
    int retval;

    D(bug("Calling ResizeImage()\n"));

    CGX_DestroyImage(this, screen);

    if (flags & SDL_INTERNALOPENGL) {   /* No image when using GL */
        retval = 0;
    } else {
        retval = CGX_SetupImage(this, screen);
        /* We support asynchronous blitting on the display */
        if (flags & SDL_ASYNCBLIT) {
            if (num_CPU() > 1) {
                screen->flags |= SDL_ASYNCBLIT;
            }
        }
    }
    return (retval);
}

int
CGX_AllocHWSurface(_THIS, SDL_Surface * surface)
{
    D(bug
      ("Alloc HW surface...%ld x %ld x %ld!\n", surface->w, surface->h,
       this->hidden->depth));

    if (surface == SDL_VideoSurface) {
        D(bug("Allocation skipped, it's system one!\n"));
        return 0;
    }

    if (!surface->hwdata) {
        if (!(surface->hwdata = SDL_malloc(sizeof(struct private_hwdata))))
            return -1;
    }

    surface->hwdata->mask = NULL;
    surface->hwdata->lock = NULL;
    surface->hwdata->videodata = this;
    surface->hwdata->allocated = 0;

    if (surface->hwdata->bmap =
        AllocBitMap(surface->w, surface->h, this->hidden->depth,
                    BMF_MINPLANES, SDL_Display->RastPort.BitMap)) {
        surface->hwdata->allocated = 1;
        surface->flags |= SDL_HWSURFACE;
        D(bug("...OK\n"));
        return 0;
    } else {
        SDL_free(surface->hwdata);
        surface->hwdata = NULL;
    }

    return (-1);
}

void
CGX_FreeHWSurface(_THIS, SDL_Surface * surface)
{
    if (surface && surface != SDL_VideoSurface && surface->hwdata) {
        D(bug("Free hw surface.\n"));

        if (surface->hwdata->mask)
            SDL_free(surface->hwdata->mask);

        if (surface->hwdata->bmap && surface->hwdata->allocated)
            FreeBitMap(surface->hwdata->bmap);

        SDL_free(surface->hwdata);
        surface->hwdata = NULL;
        surface->pixels = NULL;
        D(bug("end of free hw surface\n"));
    }
    return;
}

int
CGX_LockHWSurface(_THIS, SDL_Surface * surface)
{
    if (surface->hwdata) {
//              D(bug("Locking a bitmap...\n"));
        if (!surface->hwdata->lock) {
            Uint32 pitch;

            if (!
                (surface->hwdata->lock =
                 LockBitMapTags(surface->hwdata->bmap, LBMI_BASEADDRESS,
                                (ULONG) & surface->pixels,
                                LBMI_BYTESPERROW, (ULONG) & pitch, TAG_DONE)))
                return -1;

// surface->pitch e' a 16bit!

            surface->pitch = pitch;

            if (!currently_fullscreen && surface == SDL_VideoSurface)
                surface->pixels =
                    ((char *) surface->pixels) +
                    (surface->pitch *
                     (SDL_Window->BorderTop + SDL_Window->TopEdge) +
                     surface->format->BytesPerPixel *
                     (SDL_Window->BorderLeft + SDL_Window->LeftEdge));
        }
        D(
             else
             bug("Already locked!!!\n"));
    }
    return (0);
}

void
CGX_UnlockHWSurface(_THIS, SDL_Surface * surface)
{
    if (surface->hwdata && surface->hwdata->lock) {
        UnLockBitMap(surface->hwdata->lock);
        surface->hwdata->lock = NULL;
//              surface->pixels=NULL;
    }
}

int
CGX_FlipHWSurface(_THIS, SDL_Surface * surface)
{
    static int current = 0;

    if (this->hidden->dbuffer) {
        if (!SafeChange) {
            Wait(disp_sigbit);
// Non faccio nulla, vuoto solo la porta
            while (GetMsg(dispport) != NULL);
            SafeChange = TRUE;
        }

        if (ChangeScreenBuffer(SDL_Display, this->hidden->SB[current ^ 1])) {
            surface->hwdata->bmap = SDL_RastPort->BitMap =
                this->hidden->SB[current]->sb_BitMap;
            SafeChange = FALSE;
            SafeDisp = FALSE;
            current ^= 1;
        }

        if (!SafeDisp) {
            Wait(safe_sigbit);
            while (GetMsg(safeport) != NULL);
            SafeDisp = TRUE;
        }

    }
    return (0);
}

/* Byte-swap the pixels in the display image */
static void
CGX_SwapAllPixels(SDL_Surface * screen)
{
    int x, y;

    switch (screen->format->BytesPerPixel) {
    case 2:
        {
            Uint16 *spot;
            for (y = 0; y < screen->h; ++y) {
                spot = (Uint16 *) ((Uint8 *) screen->pixels +
                                   y * screen->pitch);
                for (x = 0; x < screen->w; ++x, ++spot) {
                    *spot = SDL_Swap16(*spot);
                }
            }
        }
        break;

    case 4:
        {
            Uint32 *spot;
            for (y = 0; y < screen->h; ++y) {
                spot = (Uint32 *) ((Uint8 *) screen->pixels +
                                   y * screen->pitch);
                for (x = 0; x < screen->w; ++x, ++spot) {
                    *spot = SDL_Swap32(*spot);
                }
            }
        }
        break;

    default:
        /* should never get here */
        break;
    }
}
static void
CGX_SwapPixels(SDL_Surface * screen, int numrects, SDL_Rect * rects)
{
    int i;
    int x, minx, maxx;
    int y, miny, maxy;

    switch (screen->format->BytesPerPixel) {
    case 2:
        {
            Uint16 *spot;
            for (i = 0; i < numrects; ++i) {
                minx = rects[i].x;
                maxx = rects[i].x + rects[i].w;
                miny = rects[i].y;
                maxy = rects[i].y + rects[i].h;
                for (y = miny; y < maxy; ++y) {
                    spot = (Uint16 *) ((Uint8 *) screen->pixels +
                                       y * screen->pitch + minx * 2);
                    for (x = minx; x < maxx; ++x, ++spot) {
                        *spot = SDL_Swap16(*spot);
                    }
                }
            }
        }
        break;

    case 4:
        {
            Uint32 *spot;
            for (i = 0; i < numrects; ++i) {
                minx = rects[i].x;
                maxx = rects[i].x + rects[i].w;
                miny = rects[i].y;
                maxy = rects[i].y + rects[i].h;
                for (y = miny; y < maxy; ++y) {
                    spot = (Uint32 *) ((Uint8 *) screen->pixels +
                                       y * screen->pitch + minx * 4);
                    for (x = minx; x < maxx; ++x, ++spot) {
                        *spot = SDL_Swap32(*spot);
                    }
                }
            }
        }
        break;

    default:
        /* should never get here */
        break;
    }
}

#ifdef __SASC

#define USE_WPA WritePixelArray
#else

void
USE_WPA(char *a, int b, int c, int d, struct RastPort *e, int f, int g,
        int h, int i, Uint32 l)
{
    WritePixelArray(a, b, c, d, e, f, g, h, i, l);
}

#endif

static void
CGX_FakeUpdate(_THIS, int numrects, SDL_Rect * rects)
{
}

static void
CGX_NormalUpdate(_THIS, int numrects, SDL_Rect * rects)
{
    int i, format, customroutine = 0;
#ifndef USE_CGX_WRITELUTPIXEL
    int bpp;
#endif
    if (this->hidden->same_format && !use_picasso96) {
        format = RECTFMT_RAW;
    } else
        switch (this->screen->format->BytesPerPixel) {
        case 4:
            format = RECTFMT_RGBA;
            break;
        case 3:
            format = RECTFMT_RGB;
            break;
        case 2:
            customroutine = 1;
            break;
        case 1:
//                      D(bug("soft depth: 8 hardbpp: %ld\n",this->hidden->depth));
            if (this->hidden->depth > 8) {
#ifndef USE_CGX_WRITELUTPIXEL
                if (this->hidden->depth > 32)
                    customroutine = 4;
                else if (this->hidden->depth > 16) {
                    bpp = this->hidden->BytesPerPixel;  // That one is the only one that needs bpp
                    customroutine = 2;  // The slow one!
                } else
                    customroutine = 3;
#else

                customroutine = 2;
#endif

//                              format=RECTFMT_LUT8;   Vecchia funzione x usare la WritePixelArray.
            } else
                customroutine = 1;
            break;
        default:
            D(bug("Unable to blit this surface!\n"));
            return;
        }

    /* Check for endian-swapped X server, swap if necessary (VERY slow!) */
    if (swap_pixels && ((this->screen->format->BytesPerPixel % 2) == 0)) {
        D(bug("Software Swapping! SLOOOW!\n"));
        CGX_SwapPixels(this->screen, numrects, rects);
        for (i = 0; i < numrects; ++i) {
            if (!rects[i].w) {  /* Clipped? */
                continue;
            }
            USE_WPA(this->screen->pixels, rects[i].x, rects[i].y,
                    this->screen->pitch, SDL_RastPort,
                    SDL_Window->BorderLeft + rects[i].x,
                    SDL_Window->BorderTop + rects[i].y, rects[i].w,
                    rects[i].h, format);
        }
        CGX_SwapPixels(this->screen, numrects, rects);
    } else if (customroutine == 2) {
#ifdef USE_CGX_WRITELUTPIXEL
        for (i = 0; i < numrects; ++i) {
            if (!rects[i].w) {  /* Clipped? */
                continue;
            }

            WLUT(this->screen->pixels, rects[i].x, rects[i].y,
                 this->screen->pitch, SDL_RastPort, SDL_XPixels,
                 SDL_Window->BorderLeft + rects[i].x,
                 SDL_Window->BorderTop + rects[i].y, rects[i].w,
                 rects[i].h, CTABFMT_XRGB8);
        }
#else
        unsigned char *bm_address;
        Uint32 destpitch;
        APTR handle;

        if (handle =
            LockBitMapTags(SDL_RastPort->BitMap, LBMI_BASEADDRESS,
                           &bm_address, LBMI_BYTESPERROW, &destpitch,
                           TAG_DONE)) {
            int srcwidth;
            unsigned char *destbase;
            register int j, k, t;
            register unsigned char *mask, *dst;
            register unsigned char *src, *dest;

// Aggiungo il bordo della finestra se sono fullscreen.
            if (currently_fullscreen)
                destbase = bm_address;
            else
                destbase =
                    bm_address + (SDL_Window->TopEdge +
                                  SDL_Window->BorderTop) * destpitch +
                    (SDL_Window->BorderLeft +
                     SDL_Window->LeftEdge) * this->hidden->BytesPerPixel;

            for (i = 0; i < numrects; ++i) {
                srcwidth = rects[i].w;

                if (!srcwidth) {        /* Clipped? */
                    continue;
                }

                dest = destbase + rects[i].x * this->hidden->BytesPerPixel;
                dest += (rects[i].y * destpitch);
                src = ((char *) (this->screen->pixels)) + rects[i].x;
                src += (rects[i].y * this->screen->pitch);

                for (j = rects[i].h; j; --j) {
                    dst = dest;
// SLOW routine, used for 8->24 bit mapping
                    for (k = 0; k < srcwidth; k++) {
                        mask = (unsigned char *) (&SDL_XPixels[src[k]]);
                        for (t = 0; t < bpp; t++) {
                            dst[t] = mask[t];
                        }
                        dst += bpp;
                    }
                    src += this->screen->pitch;
                    dest += destpitch;
                }
            }
            UnLockBitMap(handle);
        }
    } else if (customroutine == 3) {
        unsigned char *bm_address;
        Uint32 destpitch;
        APTR handle;

        if (handle =
            LockBitMapTags(SDL_RastPort->BitMap, LBMI_BASEADDRESS,
                           &bm_address, LBMI_BYTESPERROW, &destpitch,
                           TAG_DONE)) {
            int srcwidth;
            unsigned char *destbase;
            register int j, k;
            register unsigned char *src, *dest;
            register Uint16 *destl, *srcl;

            if (currently_fullscreen)
                destbase = bm_address;
            else
                destbase =
                    bm_address + (SDL_Window->TopEdge +
                                  SDL_Window->BorderTop) * destpitch +
                    (SDL_Window->BorderLeft +
                     SDL_Window->LeftEdge) * this->hidden->BytesPerPixel;

            for (i = 0; i < numrects; ++i) {
                srcwidth = rects[i].w;

                if (!srcwidth) {        /* Clipped? */
                    continue;
                }

                dest = destbase + rects[i].x * this->hidden->BytesPerPixel;
                dest += (rects[i].y * destpitch);
                src = ((char *) (this->screen->pixels)) + rects[i].x;
                src += (rects[i].y * this->screen->pitch);

// This is the fast, well not too slow, remapping code for 16bit displays

                for (j = rects[i].h; j; --j) {
                    destl = (Uint16 *) dest;

                    for (k = 0; k < srcwidth; k++) {
                        srcl = (Uint16 *) & SDL_XPixels[src[k]];
                        *destl = *srcl;
                        destl++;
                    }
                    src += this->screen->pitch;
                    dest += destpitch;
                }
            }
            UnLockBitMap(handle);
        }
    } else if (customroutine == 4) {
        unsigned char *bm_address;
        Uint32 destpitch;
        APTR handle;

        if (handle =
            LockBitMapTags(SDL_RastPort->BitMap, LBMI_BASEADDRESS,
                           &bm_address, LBMI_BYTESPERROW, &destpitch,
                           TAG_DONE)) {
            int srcwidth;
            unsigned char *destbase;
            register int j, k;
            register unsigned char *src, *dest;
            register Uint32 *destl, *srcl;

            if (currently_fullscreen)
                destbase = bm_address;
            else
                destbase =
                    bm_address + (SDL_Window->TopEdge +
                                  SDL_Window->BorderTop) * destpitch +
                    (SDL_Window->BorderLeft +
                     SDL_Window->LeftEdge) * this->hidden->BytesPerPixel;

            for (i = 0; i < numrects; ++i) {
                srcwidth = rects[i].w;

                if (!srcwidth) {        /* Clipped? */
                    continue;
                }

                dest = destbase + rects[i].x * this->hidden->BytesPerPixel;
                dest += (rects[i].y * destpitch);
                src = ((char *) (this->screen->pixels)) + rects[i].x;
                src += (rects[i].y * this->screen->pitch);

// This is the fast, well not too slow, remapping code for 32bit displays

                for (j = rects[i].h; j; --j) {
                    destl = (Uint32 *) dest;

                    for (k = 0; k < srcwidth; k++) {
                        srcl = (Uint32 *) & SDL_XPixels[src[k]];
                        *destl = *srcl;
                        destl++;
                    }
                    src += this->screen->pitch;
                    dest += destpitch;
                }
            }
            UnLockBitMap(handle);
        }
#endif
    } else if (customroutine) {
        unsigned char *bm_address;
        Uint32 destpitch;
        APTR handle;

//              D(bug("Using customroutine!\n"));

        if (handle =
            LockBitMapTags(SDL_RastPort->BitMap, LBMI_BASEADDRESS,
                           (ULONG) & bm_address, LBMI_BYTESPERROW,
                           (ULONG) & destpitch, TAG_DONE)) {
            unsigned char *destbase;
            register int j, srcwidth;
            register unsigned char *src, *dest;

// Aggiungo il bordo della finestra se sono fullscreen.
            if (currently_fullscreen)
                destbase = bm_address;
            else
                destbase =
                    bm_address + (SDL_Window->TopEdge +
                                  SDL_Window->BorderTop) * destpitch +
                    (SDL_Window->BorderLeft +
                     SDL_Window->LeftEdge) *
                    this->screen->format->BytesPerPixel;

            for (i = 0; i < numrects; ++i) {
                srcwidth = rects[i].w;

                if (!srcwidth) {        /* Clipped? */
                    continue;
                }

                dest =
                    destbase +
                    rects[i].x * this->screen->format->BytesPerPixel;
                dest += (rects[i].y * destpitch);
                src =
                    ((char *) (this->screen->pixels)) +
                    rects[i].x * this->screen->format->BytesPerPixel;
                src += (rects[i].y * this->screen->pitch);

                srcwidth *= this->screen->format->BytesPerPixel;

//                              D(bug("Rects: %ld,%ld %ld,%ld Src:%lx Dest:%lx\n",rects[i].x,rects[i].y,rects[i].w,rects[i].h,src,dest));

                for (j = rects[i].h; j; --j) {
                    SDL_memcpy(dest, src, srcwidth);
                    src += this->screen->pitch;
                    dest += destpitch;
                }
            }
            UnLockBitMap(handle);
//                      D(bug("Rectblit addr: %lx pitch: %ld rects:%ld srcptr: %lx srcpitch: %ld\n",bm_address,destpitch,numrects,this->screen->pixels,this->screen->pitch));
        }
    } else {
        for (i = 0; i < numrects; ++i) {
            if (!rects[i].w) {  /* Clipped? */
                continue;
            }
            USE_WPA(this->screen->pixels, rects[i].x, rects[i].y,
                    this->screen->pitch, SDL_RastPort,
                    SDL_Window->BorderLeft + rects[i].x,
                    SDL_Window->BorderTop + rects[i].y, rects[i].w,
                    rects[i].h, format);
        }
    }
}

void
CGX_RefreshDisplay(_THIS)
{
    int format, customroutine = 0;
#ifndef USE_CGX_WRITELUTPIXEL
    int bpp;
#endif
    /* Don't refresh a display that doesn't have an image (like GL) */
    if (!SDL_Ximage) {
        return;
    }

    if (this->hidden->same_format && !use_picasso96) {
        format = RECTFMT_RAW;
    } else
        switch (this->screen->format->BytesPerPixel) {
        case 4:
            format = RECTFMT_RGBA;
            break;
        case 3:
            format = RECTFMT_RGB;
            break;
        case 2:
            customroutine = 1;
            break;
        case 1:
//                      D(bug("soft depth: 8 hardbpp: %ld\n",this->hidden->depth));
            if (this->hidden->depth > 8) {
#ifndef USE_CGX_WRITELUTPIXEL
                if (this->hidden->depth > 32)
                    customroutine = 4;
                else if (this->hidden->depth > 16) {
                    bpp = this->hidden->BytesPerPixel;  // That one is the only one that needs bpp
                    customroutine = 2;  // The slow one!
                } else
                    customroutine = 3;
#else

                customroutine = 2;
#endif
//                              format=RECTFMT_LUT8;
            } else
                customroutine = 1;
            break;

        }

    /* Check for endian-swapped X server, swap if necessary */
    if (swap_pixels && ((this->screen->format->BytesPerPixel % 2) == 0)) {
        CGX_SwapAllPixels(this->screen);
        USE_WPA(this->screen->pixels, 0, 0, this->screen->pitch,
                SDL_RastPort, SDL_Window->BorderLeft,
                SDL_Window->BorderTop, this->screen->w, this->screen->h,
                format);
        CGX_SwapAllPixels(this->screen);
    } else if (customroutine == 2) {
#ifdef USE_CGX_WRITELUTPIXEL
        WLUT(this->screen->pixels, 0, 0, this->screen->pitch,
             SDL_RastPort, SDL_XPixels, SDL_Window->BorderLeft,
             SDL_Window->BorderTop, this->screen->w, this->screen->h,
             CTABFMT_XRGB8);
#else
        unsigned char *bm_address;
        Uint32 destpitch;
        APTR handle;

        if (handle =
            LockBitMapTags(SDL_RastPort->BitMap, LBMI_BASEADDRESS,
                           (ULONG) & bm_address, LBMI_BYTESPERROW,
                           (ULONG) & destpitch, TAG_DONE)) {
            register int j, k, t;
            register unsigned char *mask, *dst;
            register unsigned char *src, *dest;

// Aggiungo il bordo della finestra se sono fullscreen.
            if (!currently_fullscreen)
                dest =
                    bm_address + (SDL_Window->TopEdge +
                                  SDL_Window->BorderTop) * destpitch +
                    (SDL_Window->BorderLeft +
                     SDL_Window->LeftEdge) * this->hidden->BytesPerPixel;
            else
                dest = bm_address;

            src = this->screen->pixels;

            for (j = this->screen->h; j; --j) {
                dst = dest;
// SLOW routine, used for 8->24 bit mapping
                for (k = 0; k < this->screen->w; k++) {
                    mask = (unsigned char *) (&SDL_XPixels[src[k]]);
                    for (t = 0; t < bpp; t++) {
                        dst[t] = mask[t];
                    }
                    dst += bpp;
                }
                src += this->screen->pitch;
                dest += destpitch;
            }
            UnLockBitMap(handle);
        }
    } else if (customroutine == 3) {
        unsigned char *bm_address;
        Uint32 destpitch;
        APTR handle;

        if (handle =
            LockBitMapTags(SDL_RastPort->BitMap, LBMI_BASEADDRESS,
                           (ULONG) & bm_address, LBMI_BYTESPERROW,
                           (ULONG) & destpitch, TAG_DONE)) {
            register int j, k;
            register unsigned char *src, *dest;
            register Uint16 *destl, *srcl;

            if (!currently_fullscreen)
                dest =
                    bm_address + (SDL_Window->TopEdge +
                                  SDL_Window->BorderTop) * destpitch +
                    (SDL_Window->BorderLeft +
                     SDL_Window->LeftEdge) * this->hidden->BytesPerPixel;
            else
                dest = bm_address;

            src = this->screen->pixels;

// This is the fast, well not too slow, remapping code for 16bit displays

            for (j = this->screen->h; j; --j) {
                destl = (Uint16 *) dest;

                for (k = 0; k < this->screen->w; k++) {
                    srcl = (Uint16 *) & SDL_XPixels[src[k]];
                    *destl = *srcl;
                    destl++;
                }
                src += this->screen->pitch;
                dest += destpitch;
            }
            UnLockBitMap(handle);
        }
    } else if (customroutine == 4) {
        unsigned char *bm_address;
        Uint32 destpitch;
        APTR handle;

        if (handle =
            LockBitMapTags(SDL_RastPort->BitMap, LBMI_BASEADDRESS,
                           (ULONG) & bm_address, LBMI_BYTESPERROW,
                           (ULONG) & destpitch, TAG_DONE)) {
            register int j, k;
            register unsigned char *src, *dest;
            register Uint32 *destl, *srcl;

            if (!currently_fullscreen)
                dest =
                    bm_address + (SDL_Window->TopEdge +
                                  SDL_Window->BorderTop) * destpitch +
                    (SDL_Window->BorderLeft +
                     SDL_Window->LeftEdge) * this->hidden->BytesPerPixel;
            else
                dest = bm_address;

            src = this->screen->pixels;

// This is the fast, well not too slow, remapping code for 32bit displays

            for (j = this->screen->h; j; --j) {
                destl = (Uint32 *) dest;

                for (k = 0; k < this->screen->w; k++) {
                    srcl = (Uint32 *) & SDL_XPixels[src[k]];
                    *destl = *srcl;
                    destl++;
                }
                src += this->screen->pitch;
                dest += destpitch;
            }
            UnLockBitMap(handle);
        }
#endif
    } else if (customroutine) {
        unsigned char *bm_address;
        Uint32 destpitch;
        APTR handle;

        if (handle = LockBitMapTags(SDL_RastPort->BitMap,
                                    LBMI_BASEADDRESS, (ULONG) & bm_address,
                                    LBMI_BYTESPERROW, (ULONG) & destpitch,
                                    TAG_DONE)) {
            register int j;
            register unsigned char *src, *dest;

            if (!currently_fullscreen)
                dest =
                    bm_address + (SDL_Window->TopEdge +
                                  SDL_Window->BorderTop) * destpitch +
                    (SDL_Window->BorderLeft +
                     SDL_Window->LeftEdge) *
                    this->screen->format->BytesPerPixel;
            else
                dest = bm_address;

            src = this->screen->pixels;

//                      D(bug("addr: %lx pitch: %ld src:%lx srcpitch: %ld\n",dest,destpitch,this->screen->pixels,this->screen->pitch));

            if (this->screen->pitch == destpitch) {
                SDL_memcpy(dest, src, this->screen->pitch * this->screen->h);
            } else {
                for (j = this->screen->h; j; --j) {
                    SDL_memcpy(dest, src, this->screen->pitch);
                    src += this->screen->pitch;
                    dest += destpitch;
                }
            }

            UnLockBitMap(handle);
        }
    } else {
        USE_WPA(this->screen->pixels, 0, 0, this->screen->pitch,
                SDL_RastPort, SDL_Window->BorderLeft,
                SDL_Window->BorderTop, this->screen->w, this->screen->h,
                format);
    }

}

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