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/*

 * Copyright (c) 1999, 2000, 2001 Greg Haerr <greg@censoft.com>

 * Portions Copyright (c) 1991 David I. Bell

 * Permission is granted to use, distribute, or modify this source,

 * provided that this copyright notice remains intact.

 *

 * Device-independent mid level screen device init routines

 *

 * These routines implement the smallest Microwindows engine level

 * interface to the screen driver.  By setting the NOFONTSORCLIPPING

 * config option, only these routines will be included, which can

 * be used to generate a low-level interface to the screen drivers

 * without dragging in any other GdXXX routines.

 */

#include <stdio.h>

#include <stdlib.h>

#include "device.h"

#include "swap.h"

#if MSDOS | ELKS

#define NOSTDPAL8

#endif

/*

 * The following define can change depending on the window manager

 * usage of colors and layout of the 8bpp palette devpal8.c.

 * Color entries below this value won't be overwritten by user

 * programs or bitmap display conversion tables.

 */

#define FIRSTUSERPALENTRY       24  /* first writable pal entry over 16 color*/

       MWPIXELVAL gr_foreground;      /* current foreground color */

       MWPIXELVAL gr_background;      /* current background color */

       MWBOOL   gr_usebg;           /* TRUE if background drawn in pixmaps */

       int      gr_mode = MWMODE_COPY;      /* drawing mode */

/*static*/ MWPALENTRY   gr_palette[256];    /* current palette*/

/*static*/ int  gr_firstuserpalentry;/* first user-changable palette entry*/

/*static*/ int  gr_nextpalentry;    /* next available palette entry*/

static int      gr_pixtype;         /* screen pixel format*/

static long     gr_ncolors;         /* screen # colors*/

/*

 * Open low level graphics driver

 */

PSD

GdOpenScreen(void)

{

        PSD                     psd;

        MWPALENTRY *            stdpal;

        MWSCREENINFO            sinfo;

        psd = scrdev.Open(&scrdev);

        if (!psd)

                return NULL;

        GdGetScreenInfo(psd, &sinfo);

        gr_pixtype = sinfo.pixtype;

        gr_ncolors = sinfo.ncolors;

        /* assume no user changable palette entries*/

        gr_firstuserpalentry = (int)psd->ncolors;

        /* set palette according to system colors and devpalX.c*/

        switch((int)psd->ncolors) {

#if !defined(NOSTDPAL1) /* don't require stdpal1 if not needed */

        case 2:         /* 1bpp*/

        {

                extern MWPALENTRY       mwstdpal1[2];

                stdpal = mwstdpal1;

        }

        break;

#endif

#if !defined(NOSTDPAL2) /* don't require stdpal2 if not needed */

        case 4:         /* 2bpp*/

        {

                extern MWPALENTRY       mwstdpal2[4];

                stdpal = mwstdpal2;

        }

        break;

#endif

#if !defined(NOSTDPAL4)

        /* don't require stdpal4 if not needed */

        case 8:         /* 3bpp - not fully supported*/

        case 16:        /* 4bpp*/

        {

                extern MWPALENTRY       mwstdpal4[16];

                stdpal = mwstdpal4;

        }

        break;

#endif

#if !defined(NOSTDPAL8) /* don't require large stdpal8 if not needed */

        case 256:       /* 8bpp*/

        {

                extern MWPALENTRY       mwstdpal8[256];

#if xxxALPHABLEND

                /* don't change uniform palette if alpha blending*/

                gr_firstuserpalentry = 256;

#else

                /* start after last system-reserved color*/

                gr_firstuserpalentry = FIRSTUSERPALENTRY;

#endif

                stdpal = mwstdpal8;

        }

        break;

#endif  /* !defined(NOSTDPAL8)*/

        default:        /* truecolor*/

                /* no palette*/

                gr_firstuserpalentry = 0;

                stdpal = NULL;

        }

        /* reset next user palette entry, write hardware palette*/

        GdResetPalette();

        GdSetPalette(psd, 0, (int)psd->ncolors, stdpal);

#if xxxALPHABLEND

        /* one-time create alpha lookup table for 8bpp systems (takes ~1 sec)*/

        if(psd->ncolors == 256)

                init_alpha_lookup();

#endif

#if !NOFONTSORCLIPPING

        /* init local vars*/

        GdSetMode(MWMODE_COPY);

        GdSetForeground(GdFindColor(MWRGB(255, 255, 255)));     /* WHITE*/

        GdSetBackground(GdFindColor(MWRGB(0, 0, 0)));              /* BLACK*/

        GdSetUseBackground(TRUE);

        GdSetFont(GdCreateFont(psd, MWFONT_SYSTEM_VAR, 0, NULL));

#if DYNAMICREGIONS

        GdSetClipRegion(psd,

                GdAllocRectRegion(0, 0, psd->xvirtres, psd->yvirtres));

#else

        GdSetClipRects(psd, 0, NULL);

#endif /* DYNAMICREGIONS*/

#endif /* NOFONTSORCLIPPING*/

        /* fill black (actually fill to first palette entry or truecolor 0*/

        psd->FillRect(psd, 0, 0, psd->xvirtres-1, psd->yvirtres-1, 0);

        return psd;

}

/*

 * Close low level graphics driver

 */

void

GdCloseScreen(PSD psd)

{

        psd->Close(psd);

}

/* Set dynamic screen portrait mode, return new mode*/

int

GdSetPortraitMode(PSD psd, int portraitmode)

{

        /* set portrait mode if supported*/

        if (psd->SetPortrait)

                psd->SetPortrait(psd, portraitmode);

        return psd->portrait;

}

/*

 * Return about the screen.

 */

void

GdGetScreenInfo(PSD psd, PMWSCREENINFO psi)

{

        psd->GetScreenInfo(psd, psi);

        GdGetButtonInfo(&psi->buttons);

        GdGetModifierInfo(&psi->modifiers, NULL);

        GdGetCursorPos(&psi->xpos, &psi->ypos);

}

/* reset palette to empty except for system colors*/

void

GdResetPalette(void)

{

        /* note: when palette entries are changed, all

         * windows may need to be redrawn

         */

        gr_nextpalentry = gr_firstuserpalentry;

}

/* set the system palette section to the passed palette entries*/

void

GdSetPalette(PSD psd, int first, int count, MWPALENTRY *palette)

{

        int     i;

        /* no palette management needed if running truecolor*/

        if(psd->pixtype != MWPF_PALETTE)

                return;

        /* bounds check against # of device color entries*/

        if(first + count > (int)psd->ncolors)

                count = (int)psd->ncolors - first;

        if(count >= 0 && first < (int)psd->ncolors) {

                psd->SetPalette(psd, first, count, palette);

                /* copy palette for GdFind*Color*/

                for(i=0; i<count; ++i)

                        gr_palette[i+first] = palette[i];

        }

}

/* get system palette entries, return count*/

int

GdGetPalette(PSD psd, int first, int count, MWPALENTRY *palette)

{

        int     i;

        /* no palette if running truecolor*/

        if(psd->pixtype != MWPF_PALETTE)

                return 0;

        /* bounds check against # of device color entries*/

        if(first + count > (int)psd->ncolors)

                if( (count = (int)psd->ncolors - first) <= 0)

                        return 0;

        for(i=0; i<count; ++i)

                *palette++ = gr_palette[i+first];

        return count;

}

/*

 * Convert a palette-independent value to a hardware color

 */

MWPIXELVAL

GdFindColor(MWCOLORVAL c)

{

        /*

         * Handle truecolor displays.  Note that the MWF_PALINDEX

         * bit is ignored when running truecolor drivers.

         */

        switch(gr_pixtype) {

        case MWPF_TRUECOLOR0888:

        case MWPF_TRUECOLOR888:

                /* create 24 bit 8/8/8 pixel (0x00RRGGBB) from RGB colorval*/

                /*RGB2PIXEL888(REDVALUE(c), GREENVALUE(c), BLUEVALUE(c))*/

                return COLOR2PIXEL888(c);

        case MWPF_TRUECOLOR565:

                /* create 16 bit 5/6/5 format pixel from RGB colorval*/

                /*RGB2PIXEL565(REDVALUE(c), GREENVALUE(c), BLUEVALUE(c))*/

                return COLOR2PIXEL565(c);

        case MWPF_TRUECOLOR555:

                /* create 16 bit 5/5/5 format pixel from RGB colorval*/

                /*RGB2PIXEL555(REDVALUE(c), GREENVALUE(c), BLUEVALUE(c))*/

                return COLOR2PIXEL555(c);

        case MWPF_TRUECOLOR332:

                /* create 8 bit 3/3/2 format pixel from RGB colorval*/

                /*RGB2PIXEL332(REDVALUE(c), GREENVALUE(c), BLUEVALUE(c))*/

                return COLOR2PIXEL332(c);

        }

        /* case MWPF_PALETTE: must be running 1, 2, 4 or 8 bit palette*/

        /*

         * Check if color is a palette index.  Note that the index

         * isn't error checked against the system palette, for speed.

         */

        if(c & MWF_PALINDEX)

                return (c & 0xff);

        /* search palette for closest match*/

        return GdFindNearestColor(gr_palette, (int)gr_ncolors, c);

}

/*

 * Search a palette to find the nearest color requested.

 * Uses a weighted squares comparison.

 */

MWPIXELVAL

GdFindNearestColor(MWPALENTRY *pal, int size, MWCOLORVAL cr)

{

        MWPALENTRY *    rgb;

        int             r, g, b;

        int             R, G, B;

        long            diff = 0x7fffffffL;

        long            sq;

        int             best = 0;

        r = REDVALUE(cr);

        g = GREENVALUE(cr);

        b = BLUEVALUE(cr);

        for(rgb=pal; diff && rgb < &pal[size]; ++rgb) {

                R = rgb->r - r;

                G = rgb->g - g;

                B = rgb->b - b;

#if 1

                /* speedy linear distance method*/

                sq = abs(R) + abs(G) + abs(B);

#else

                /* slower distance-cubed with luminance adjustment*/

                /* gray is .30R + .59G + .11B*/

                /* = (R*77 + G*151 + B*28)/256*/

                sq = (long)R*R*30*30 + (long)G*G*59*59 + (long)B*B*11*11;

#endif

                if(sq < diff) {

                        best = rgb - pal;

                        if((diff = sq) == 0)

                                return best;

                }

        }

        return best;

}

#if !VXWORKS

#include <unistd.h>

#include <fcntl.h>

/*

 * Create .bmp file from framebuffer data

 *

 * 1, 4, 8, 16, 24 and 32 bpp supported

 */

#define BI_RGB          0L

#define BI_RLE8         1L

#define BI_RLE4         2L

#define BI_BITFIELDS    3L

typedef unsigned char   BYTE;

typedef unsigned short  WORD;

typedef unsigned long   DWORD;

typedef long            LONG;

#pragma pack(1)

/* windows style bmp*/

typedef struct {

        /* BITMAPFILEHEADER*/

        BYTE    bfType[2];

        DWORD   bfSize;

        WORD    bfReserved1;

        WORD    bfReserved2;

        DWORD   bfOffBits;

        /* BITMAPINFOHEADER*/

        DWORD   BiSize;

        LONG    BiWidth;

        LONG    BiHeight;

        WORD    BiPlanes;

        WORD    BiBitCount;

        DWORD   BiCompression;

        DWORD   BiSizeImage;

        LONG    BiXpelsPerMeter;

        LONG    BiYpelsPerMeter;

        DWORD   BiClrUsed;

        DWORD   BiClrImportant;

} BMPHEAD;

#pragma pack()

/* r/g/b masks for non-palette bitmaps*/

#define RMASK332        0xe0

#define GMASK332        0x1c

#define BMASK332        0x03

#define RMASK555        0x7c00

#define GMASK555        0x03e0

#define BMASK555        0x001f

#define RMASK565        0xf800

#define GMASK565        0x07e0

#define BMASK565        0x001f

#define RMASK888        0xff0000

#define GMASK888        0x00ff00

#define BMASK888        0x0000ff

#if defined(HAVE_FILEIO)

static void

putsw(unsigned long dw, FILE *ofp)

{

        /* little-endian storage of shortword*/

        putc((unsigned char)dw, ofp);

        dw >>= 8;

        putc((unsigned char)dw, ofp);

}

static void

putdw(unsigned long dw, FILE *ofp)

{

        /* little-endian storage of longword*/

        putc((unsigned char)dw, ofp);

        dw >>= 8;

        putc((unsigned char)dw, ofp);

        dw >>= 8;

        putc((unsigned char)dw, ofp);

        dw >>= 8;

        putc((unsigned char)dw, ofp);

}

#endif /* HAVE_FILEIO*/

/* create .bmp file from framebuffer data*/

int

GdCaptureScreen(char *path)

{

#if defined(HAVE_FILEIO)

        int     ifd, i, j;

        FILE *  ofp;

        int     cx, cy, extra, bpp, bytespp, ncolors, sizecolortable;

        unsigned long rmask, gmask, bmask;

        unsigned char *cptr;

        unsigned short *sptr;

        unsigned long *lptr;

        BMPHEAD bmp;

        unsigned char buf[2048*4];

        ofp = fopen(path, "wb");

        if (!ofp)

                return 1;

        ifd = open("/dev/fb0", 0);

        cx = scrdev.xvirtres;

        cy = scrdev.yvirtres;

        bpp = scrdev.bpp;

        bytespp = (bpp+7)/8;

        /* dword right padded*/

        extra = (cx*bytespp) & 3;

        if (extra)

                extra = 4 - extra;

        ncolors = (bpp <= 8)? (1<<bpp): 0;

        /* color table is either palette or 3 longword r/g/b masks*/

        sizecolortable = ncolors? ncolors*4: 3*4;

        if (bpp == 24)

                sizecolortable = 0;      /* special case 24bpp has no table*/

        /* fill out bmp header*/

        memset(&bmp, 0, sizeof(bmp));

        bmp.bfType[0] = 'B';

        bmp.bfType[1] = 'M';

        bmp.bfSize = dwswap(sizeof(bmp) + sizecolortable + (long)(cx+extra)*cy*bytespp);

        bmp.bfOffBits = dwswap(sizeof(bmp) + sizecolortable);

        bmp.BiSize = dwswap(40);

        bmp.BiWidth = dwswap(cx);

        bmp.BiHeight = dwswap(cy);

        bmp.BiPlanes = wswap(1);

        bmp.BiBitCount = wswap(bpp);

        bmp.BiCompression = dwswap((bpp==16 || bpp==32)? BI_BITFIELDS: BI_RGB);

        bmp.BiSizeImage = dwswap((long)(cx+extra)*cy*bytespp);

        bmp.BiClrUsed = dwswap((bpp <= 8)? ncolors: 0);

        /*bmp.BiClrImportant = 0;*/

        /* write header*/

        fwrite(&bmp, sizeof(bmp), 1, ofp);

        /* write colortable*/

        if (sizecolortable) {

                if(bpp <= 8) {

                        /* write palette*/

                        for(i=0; i<ncolors; i++) {

                                putc(gr_palette[i].b, ofp);

                                putc(gr_palette[i].g, ofp);

                                putc(gr_palette[i].r, ofp);

                                putc(0, ofp);

                        }

                } else {

                        /* write 3 r/g/b masks*/

                        switch (gr_pixtype) {

                        case MWPF_TRUECOLOR0888:

                        default:

                                rmask = RMASK888;

                                gmask = GMASK888;

                                bmask = BMASK888;

                                break;

                        case MWPF_TRUECOLOR565:

                                rmask = RMASK565;

                                gmask = GMASK565;

                                bmask = BMASK565;

                                break;

                        case MWPF_TRUECOLOR555:

                                rmask = RMASK555;

                                gmask = GMASK555;

                                bmask = BMASK555;

                                break;

                        case MWPF_TRUECOLOR332:

                                rmask = RMASK332;

                                gmask = GMASK332;

                                bmask = BMASK332;

                                break;

                        }

                        putdw(rmask, ofp);

                        putdw(gmask, ofp);

                        putdw(bmask, ofp);

                }

        }

        /* write image data, upside down ;)*/

        for(i=cy-1; i>=0; --i) {

                long base = sizeof(bmp) + sizecolortable + (long)i*cx*bytespp;

                fseek(ofp, base, SEEK_SET);

                read(ifd, buf, cx*bytespp);

                switch (bpp) {

                case 32:

                        lptr = (unsigned long *)buf;

                        for(j=0; j<cx; ++j)

                                putdw(*lptr++, ofp);

                        break;

                case 24:

                        cptr = (unsigned char *)buf;

                        for(j=0; j<cx; ++j) {

                                putc(*cptr++, ofp);

                                putc(*cptr++, ofp);

                                putc(*cptr++, ofp);

                        }

                        break;

                case 16:

                        sptr = (unsigned short *)buf;

                        for(j=0; j<cx; ++j)

                                putsw(*sptr++, ofp);

                        break;

                default:

                        cptr = (unsigned char *)buf;

                        for(j=0; j<cx; ++j)

                                putc(*cptr++, ofp);

                        break;

                }

                for(j=0; j<extra; ++j)

                        putc(0, ofp);            /* DWORD pad each line*/

        }

        fclose(ofp);

        close(ifd);

#endif /* HAVE_FILEIO*/

        return 0;

}

#endif /* !VXWORKS*/