xref: /xsrc/external/mit/xorg-server/dist/mi/miglblt.c

/***********************************************************

Copyright 1987, 1998  The Open Group

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in this Software without prior written authorization from The Open Group.

Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the name of Digital not be
used in advertising or publicity pertaining to distribution of the
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DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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******************************************************************/

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#include	<X11/X.h>
#include	<X11/Xmd.h>
#include	<X11/Xproto.h>
#include	"misc.h"
#include	<X11/fonts/fontstruct.h>
#include        <X11/fonts/libxfont2.h>
#include	"dixfontstr.h"
#include	"gcstruct.h"
#include	"windowstr.h"
#include	"scrnintstr.h"
#include	"pixmap.h"
#include	"servermd.h"
#include        "mi.h"

/*
    machine-independent glyph blt.
    assumes that glyph bits in snf are written in bytes,
have same bit order as the server's bitmap format,
and are byte padded.  this corresponds to the snf distributed
with the sample server.

    get a scratch GC.
    in the scratch GC set alu = GXcopy, fg = 1, bg = 0
    allocate a bitmap big enough to hold the largest glyph in the font
    validate the scratch gc with the bitmap
    for each glyph
	carefully put the bits of the glyph in a buffer,
	    padded to the server pixmap scanline padding rules
	fake a call to PutImage from the buffer into the bitmap
	use the bitmap in a call to PushPixels
*/

void
miPolyGlyphBlt(DrawablePtr pDrawable, GC * pGC, int x, int y, unsigned int nglyph, CharInfoPtr * ppci,  /* array of character info */
               void *pglyphBase       /* start of array of glyphs */
    )
{
    int width, height;
    PixmapPtr pPixmap;
    int nbyLine;                /* bytes per line of padded pixmap */
    FontPtr pfont;
    GCPtr pGCtmp;
    int i;
    int j;
    unsigned char *pbits;       /* buffer for PutImage */
    unsigned char *pb;          /* temp pointer into buffer */
    CharInfoPtr pci;            /* current char info */
    unsigned char *pglyph;      /* pointer bits in glyph */
    int gWidth, gHeight;        /* width and height of glyph */
    int nbyGlyphWidth;          /* bytes per scanline of glyph */
    int nbyPadGlyph;            /* server padded line of glyph */

    ChangeGCVal gcvals[3];

    if (pGC->miTranslate) {
        x += pDrawable->x;
        y += pDrawable->y;
    }

    pfont = pGC->font;
    width = FONTMAXBOUNDS(pfont, rightSideBearing) -
        FONTMINBOUNDS(pfont, leftSideBearing);
    height = FONTMAXBOUNDS(pfont, ascent) + FONTMAXBOUNDS(pfont, descent);

    pPixmap = (*pDrawable->pScreen->CreatePixmap) (pDrawable->pScreen,
                                                   width, height, 1,
                                                   CREATE_PIXMAP_USAGE_SCRATCH);
    if (!pPixmap)
        return;

    pGCtmp = GetScratchGC(1, pDrawable->pScreen);
    if (!pGCtmp) {
        (*pDrawable->pScreen->DestroyPixmap) (pPixmap);
        return;
    }

    gcvals[0].val = GXcopy;
    gcvals[1].val = 1;
    gcvals[2].val = 0;

    ChangeGC(NullClient, pGCtmp, GCFunction | GCForeground | GCBackground,
             gcvals);

    nbyLine = BitmapBytePad(width);
    pbits = xallocarray(height, nbyLine);
    if (!pbits) {
        (*pDrawable->pScreen->DestroyPixmap) (pPixmap);
        FreeScratchGC(pGCtmp);
        return;
    }
    while (nglyph--) {
        pci = *ppci++;
        pglyph = FONTGLYPHBITS(pglyphBase, pci);
        gWidth = GLYPHWIDTHPIXELS(pci);
        gHeight = GLYPHHEIGHTPIXELS(pci);
        if (gWidth && gHeight) {
            nbyGlyphWidth = GLYPHWIDTHBYTESPADDED(pci);
            nbyPadGlyph = BitmapBytePad(gWidth);

            if (nbyGlyphWidth == nbyPadGlyph
#if GLYPHPADBYTES != 4
                && (((int) pglyph) & 3) == 0
#endif
                ) {
                pb = pglyph;
            }
            else {
                for (i = 0, pb = pbits; i < gHeight;
                     i++, pb = pbits + (i * nbyPadGlyph))
                    for (j = 0; j < nbyGlyphWidth; j++)
                        *pb++ = *pglyph++;
                pb = pbits;
            }

            if ((pGCtmp->serialNumber) != (pPixmap->drawable.serialNumber))
                ValidateGC((DrawablePtr) pPixmap, pGCtmp);
            (*pGCtmp->ops->PutImage) ((DrawablePtr) pPixmap, pGCtmp,
                                      pPixmap->drawable.depth,
                                      0, 0, gWidth, gHeight,
                                      0, XYBitmap, (char *) pb);

            (*pGC->ops->PushPixels) (pGC, pPixmap, pDrawable,
                                     gWidth, gHeight,
                                     x + pci->metrics.leftSideBearing,
                                     y - pci->metrics.ascent);
        }
        x += pci->metrics.characterWidth;
    }
    (*pDrawable->pScreen->DestroyPixmap) (pPixmap);
    free(pbits);
    FreeScratchGC(pGCtmp);
}

void
miImageGlyphBlt(DrawablePtr pDrawable, GC * pGC, int x, int y, unsigned int nglyph, CharInfoPtr * ppci, /* array of character info */
                void *pglyphBase      /* start of array of glyphs */
    )
{
    ExtentInfoRec info;         /* used by xfont2_query_glyph_extents() */
    ChangeGCVal gcvals[3];
    int oldAlu, oldFS;
    unsigned long oldFG;
    xRectangle backrect;

    xfont2_query_glyph_extents(pGC->font, ppci, (unsigned long) nglyph, &info);

    if (info.overallWidth >= 0) {
        backrect.x = x;
        backrect.width = info.overallWidth;
    }
    else {
        backrect.x = x + info.overallWidth;
        backrect.width = -info.overallWidth;
    }
    backrect.y = y - FONTASCENT(pGC->font);
    backrect.height = FONTASCENT(pGC->font) + FONTDESCENT(pGC->font);

    oldAlu = pGC->alu;
    oldFG = pGC->fgPixel;
    oldFS = pGC->fillStyle;

    /* fill in the background */
    gcvals[0].val = GXcopy;
    gcvals[1].val = pGC->bgPixel;
    gcvals[2].val = FillSolid;
    ChangeGC(NullClient, pGC, GCFunction | GCForeground | GCFillStyle, gcvals);
    ValidateGC(pDrawable, pGC);
    (*pGC->ops->PolyFillRect) (pDrawable, pGC, 1, &backrect);

    /* put down the glyphs */
    gcvals[0].val = oldFG;
    ChangeGC(NullClient, pGC, GCForeground, gcvals);
    ValidateGC(pDrawable, pGC);
    (*pGC->ops->PolyGlyphBlt) (pDrawable, pGC, x, y, nglyph, ppci, pglyphBase);

    /* put all the toys away when done playing */
    gcvals[0].val = oldAlu;
    gcvals[1].val = oldFG;
    gcvals[2].val = oldFS;
    ChangeGC(NullClient, pGC, GCFunction | GCForeground | GCFillStyle, gcvals);
    ValidateGC(pDrawable, pGC);

}