/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 Sam Lantinga
    Copyright (C) 2001  Hsieh-Fu Tsai
    Copyright (C) 2002  Greg Haerr <greg@censoft.com>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
    
    Hsieh-Fu Tsai
    clare@setabox.com
*/
#include "SDL_config.h"

#include "SDL_nximage_c.h"

void
NX_NormalUpdate(_THIS, int numrects, SDL_Rect * rects)
{
    int i, j, xinc, yinc, destinc, rowinc;
    int x, y, w, h;
    unsigned char *src = NULL, *dest = NULL;

    Dprintf("enter NX_NormalUpdate\n");

    /* These are the values for the incoming image */
    xinc = this->screen->format->BytesPerPixel;
    yinc = this->screen->pitch;

    for (i = 0; i < numrects; ++i) {
        x = rects[i].x, y = rects[i].y;
        w = rects[i].w, h = rects[i].h;
        src = SDL_Image + y * yinc + x * xinc;
#ifdef ENABLE_NANOX_DIRECT_FB
        if (Clientfb) {
            if (currently_fullscreen)
                dest =
                    fbinfo.winpixels + (((y + OffsetY) * fbinfo.pitch) +
                                        ((x + OffsetX) * fbinfo.bytespp));
            else
                dest =
                    fbinfo.winpixels + ((y * fbinfo.pitch) +
                                        (x * fbinfo.bytespp));
            destinc = fbinfo.pitch;
        } else
#endif
        {
            dest = Image_buff;
            destinc = w * xinc;
        }
        rowinc = w * xinc;

        // apply GammaRamp table
        if ((pixel_type == MWPF_TRUECOLOR0888
             || pixel_type == MWPF_TRUECOLOR888) && GammaRamp_R
            && GammaRamp_G && GammaRamp_B) {
            Uint8 *ptrsrc;
            Uint8 *ptrdst;
            int k;

            for (j = h; j > 0; --j, src += yinc, dest += destinc) {
                ptrsrc = src;
                ptrdst = dest;
                for (k = w; k > 0; --k) {
                    *ptrdst++ = GammaRamp_B[*ptrsrc++] >> 8;
                    *ptrdst++ = GammaRamp_G[*ptrsrc++] >> 8;
                    *ptrdst++ = GammaRamp_R[*ptrsrc++] >> 8;
                    *ptrdst++ = 0;
                    ++ptrsrc;
                }
            }
        }
#if 1                           /* This is needed for microwindows 0.90 or older */
        else if (pixel_type == MWPF_TRUECOLOR0888
                 || pixel_type == MWPF_TRUECOLOR888) {
            Uint8 *ptrsrc;
            Uint8 *ptrdst;
            int k;

            for (j = h; j > 0; --j, src += yinc, dest += destinc) {
                ptrsrc = src;
                ptrdst = dest;
                for (k = w; k > 0; --k) {
                    *ptrdst++ = *ptrsrc++;
                    *ptrdst++ = *ptrsrc++;
                    *ptrdst++ = *ptrsrc++;
                    *ptrdst++ = 0;
                    ++ptrsrc;
                }
            }
        }
#endif
        else {
            for (j = h; j > 0; --j, src += yinc, dest += destinc)
                SDL_memcpy(dest, src, rowinc);
        }
        if (!Clientfb) {
            if (currently_fullscreen) {
                GrArea(FSwindow, SDL_GC, x + OffsetX, y + OffsetY, w,
                       h, Image_buff, pixel_type);
            } else {
                GrArea(SDL_Window, SDL_GC, x, y, w, h, Image_buff,
                       pixel_type);
            }
        }
    }
    GrFlush();

    Dprintf("leave NX_NormalUpdate\n");
}

int
NX_SetupImage(_THIS, SDL_Surface * screen)
{
    int size = screen->h * screen->pitch;

    Dprintf("enter NX_SetupImage\n");

    screen->pixels = (void *) SDL_malloc(size);

    if (!Clientfb) {
        Image_buff = (unsigned char *) SDL_malloc(size);
        if (screen->pixels == NULL || Image_buff == NULL) {
            SDL_free(screen->pixels);
            SDL_free(Image_buff);
            SDL_OutOfMemory();
            return -1;
        }
    }

    SDL_Image = (unsigned char *) screen->pixels;

    this->UpdateRects = NX_NormalUpdate;

    Dprintf("leave NX_SetupImage\n");
    return 0;
}

void
NX_DestroyImage(_THIS, SDL_Surface * screen)
{
    Dprintf("enter NX_DestroyImage\n");

    if (SDL_Image)
        SDL_free(SDL_Image);
    if (Image_buff)
        SDL_free(Image_buff);
    if (screen)
        screen->pixels = NULL;

    Dprintf("leave NX_DestroyImage\n");
}

int
NX_ResizeImage(_THIS, SDL_Surface * screen, Uint32 flags)
{
    int retval;
    GR_SCREEN_INFO si;

    Dprintf("enter NX_ResizeImage\n");

    NX_DestroyImage(this, screen);
    retval = NX_SetupImage(this, screen);

    GrGetScreenInfo(&si);
    OffsetX = (si.cols - screen->w) / 2;
    OffsetY = (si.rows - screen->h) / 2;

#ifdef ENABLE_NANOX_DIRECT_FB
    if (Clientfb) {
        /* Get current window position and fb pointer */
        if (currently_fullscreen)
            GrGetWindowFBInfo(FSwindow, &fbinfo);
        else
            GrGetWindowFBInfo(SDL_Window, &fbinfo);
    }
#endif
    Dprintf("leave NX_ResizeImage\n");
    return retval;
}

void
NX_RefreshDisplay(_THIS)
{
    Dprintf("enter NX_RefreshDisplay\n");

    // Don't refresh a display that doesn't have an image (like GL)
    if (!SDL_Image) {
        return;
    }
#ifdef ENABLE_NANOX_DIRECT_FB
    if (Clientfb) {
        int j;
        char *src, *dest = NULL;
        int xinc, yinc, rowinc;

        GrGetWindowFBInfo(SDL_Window, &fbinfo);

        xinc = this->screen->format->BytesPerPixel;
        yinc = this->screen->pitch;

        src = SDL_Image;
        if (currently_fullscreen)
            dest = fbinfo.winpixels + ((OffsetY * fbinfo.pitch) +
                                       (OffsetX * fbinfo.bytespp));
        else
            dest = fbinfo.winpixels;
        rowinc = xinc * this->screen->w;

        for (j = this->screen->h; j > 0;
             --j, src += yinc, dest += fbinfo.pitch)
            SDL_memcpy(dest, src, rowinc);
    } else
#endif
    {
        if (currently_fullscreen) {
            GrArea(FSwindow, SDL_GC, OffsetX, OffsetY, this->screen->w,
                   this->screen->h, SDL_Image, pixel_type);
        } else {
            GrArea(SDL_Window, SDL_GC, 0, 0, this->screen->w,
                   this->screen->h, SDL_Image, pixel_type);
        }
    }
    GrFlush();

    Dprintf("leave NX_RefreshDisplay\n");
}

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