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xserver/mfb/mfbtegblt.c

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/* $Xorg: mfbtegblt.c,v 1.4 2001/02/09 02:05:19 xorgcvs Exp $ */
/* Combined Purdue/PurduePlus patches, level 2.0, 1/17/89 */
/***********************************************************
Copyright 1987, 1998 The Open Group
Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
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
software without specific, written prior permission.
DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.
******************************************************************/
/* $XFree86: xc/programs/Xserver/mfb/mfbtegblt.c,v 1.7 2001/01/17 22:37:03 dawes Exp $ */
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#include <X11/X.h>
#include <X11/Xmd.h>
#include <X11/Xproto.h>
#include "mfb.h"
#include <X11/fonts/fontstruct.h>
#include "dixfontstr.h"
#include "gcstruct.h"
#include "windowstr.h"
#include "scrnintstr.h"
#include "pixmapstr.h"
#include "regionstr.h"
#include "maskbits.h"
/*
this works for fonts with glyphs <= PPW bits wide.
This should be called only with a terminal-emulator font;
this means that the FIXED_METRICS flag is set, and that
glyphbounds == charbounds.
in theory, this goes faster; even if it doesn't, it reduces the
flicker caused by writing a string over itself with image text (since
the background gets repainted per character instead of per string.)
this seems to be important for some converted X10 applications.
Image text looks at the bits in the glyph and the fg and bg in the
GC. it paints a rectangle, as defined in the protocol dcoument,
and the paints the characters.
to avoid source proliferation, this file is compiled
two times:
MFBTEGLYPHBLT OP
mfbTEGlyphBltWhite (white text, black bg )
mfbTEGlyphBltBlack ~ (black text, white bg )
*/
#if defined(NO_3_60_CG4) && defined(FASTPUTBITS) && defined(FASTGETBITS)
#define FASTCHARS
#endif
/*
* this macro "knows" that only characters <= 8 bits wide will
* fit this case (which is why it is independent of GLYPHPADBYTES)
*/
#if (BITMAP_BIT_ORDER == MSBFirst) && (GLYPHPADBYTES != 4)
#if GLYPHPADBYTES == 1
#define ShiftAmnt 24
#else
#define ShiftAmnt 16
#endif
/*
* XXX XXX XXX There is something horribly, massively wrong here. There are
* hardcoded shifts by 64 below; these cannot work on any present-day
* architecture.
*/
/*
* Note: for BITMAP_BIT_ORDER != IMAGE_BYTE_ORDER, SCRRIGHT() evaluates its
* first argument more than once. Thus the imbedded char++ have to be moved.
* (DHD)
*/
#if BITMAP_BIT_ORDER == IMAGE_BYTE_ORDER
#define GetBits4 c = (*char1++ << ShiftAmnt) | \
SCRRIGHT (*char2++ << ShiftAmnt, xoff2) | \
SCRRIGHT (*char3++ << ShiftAmnt, xoff3) | \
SCRRIGHT (*char4++ << ShiftAmnt, xoff4);
#else /* BITMAP_BIT_ORDER != IMAGE_BYTE_ORDER */
#define GetBits4 c = (*char1++ << ShiftAmnt) | \
SCRRIGHT (*char2 << ShiftAmnt, xoff2) | \
SCRRIGHT (*char3 << ShiftAmnt, xoff3) | \
SCRRIGHT (*char4 << ShiftAmnt, xoff4); \
char2++; char3++; char4++;
#endif /* BITMAP_BIT_ORDER == IMAGE_BYTE_ORDER */
#else /* (BITMAP_BIT_ORDER != MSBFirst) || (GLYPHPADBYTES == 4) */
#if BITMAP_BIT_ORDER == IMAGE_BYTE_ORDER
#define GetBits4 c = *char1++ | \
SCRRIGHT (*char2++, xoff2) | \
SCRRIGHT (*char3++, xoff3) | \
SCRRIGHT (*char4++, xoff4);
#else /* BITMAP_BIT_ORDER != IMAGE_BYTE_ORDER */
#define GetBits4 c = *char1++ | \
SCRRIGHT (*char2, xoff2) | \
SCRRIGHT (*char3, xoff3) | \
SCRRIGHT (*char4, xoff4); \
char2++; char3++; char4++;
#endif /* BITMAP_BIT_ORDER == IMAGE_BYTE_ORDER */
#endif /* BITMAP_BIT_ORDER && GLYPHPADBYTES */
#if GLYPHPADBYTES == 1
typedef unsigned char *glyphPointer;
#define USE_LEFTBITS
#endif
#if GLYPHPADBYTES == 2
typedef unsigned short *glyphPointer;
#define USE_LEFTBITS
#endif
#if GLYPHPADBYTES == 4
typedef unsigned int *glyphPointer;
#endif
#ifdef USE_LEFTBITS
#define GetBits1 getleftbits (char1, widthGlyph, c); \
c &= glyphMask; \
char1 = (glyphPointer) (((char *) char1) + glyphBytes);
#else
#define GetBits1 c = *char1++;
#endif
void
MFBTEGLYPHBLT(pDrawable, pGC, x, y, nglyph, ppci, pglyphBase)
DrawablePtr pDrawable;
GC *pGC;
int x, y;
unsigned int nglyph;
CharInfoPtr *ppci; /* array of character info */
pointer pglyphBase; /* start of array of glyphs */
{
FontPtr pfont = pGC->font;
int widthDst;
PixelType *pdstBase; /* pointer to longword with top row
of current glyph */
int h; /* height of glyph and char */
register int xpos; /* current x */
int ypos; /* current y */
int widthGlyph;
int hTmp; /* counter for height */
register PixelType startmask, endmask;
int nfirst; /* used if glyphs spans a longword boundary */
BoxRec bbox; /* for clipping */
int widthGlyphs;
register PixelType *dst;
register PixelType c;
register int xoff1, xoff2, xoff3, xoff4;
register glyphPointer char1, char2, char3, char4;
#ifdef USE_LEFTBITS
register PixelType glyphMask;
register PixelType tmpSrc;
register int glyphBytes;
#endif
if (!(pGC->planemask & 1))
return;
mfbGetPixelWidthAndPointer(pDrawable, widthDst, pdstBase);
xpos = x + pDrawable->x;
ypos = y + pDrawable->y;
widthGlyph = FONTMAXBOUNDS(pfont,characterWidth);
h = FONTASCENT(pfont) + FONTDESCENT(pfont);
xpos += FONTMAXBOUNDS(pfont,leftSideBearing);
ypos -= FONTASCENT(pfont);
bbox.x1 = xpos;
bbox.x2 = xpos + (widthGlyph * nglyph);
bbox.y1 = ypos;
bbox.y2 = ypos + h;
switch (RECT_IN_REGION(pGC->pScreen, pGC->pCompositeClip, &bbox))
{
case rgnPART:
/* this is the WRONG thing to do, but it works.
calling the non-terminal text is easy, but slow, given
what we know about the font.
the right thing to do is something like:
for each clip rectangle
compute at which row the glyph starts to be in it,
and at which row the glyph ceases to be in it
compute which is the first glyph inside the left
edge, and the last one inside the right edge
draw a fractional first glyph, using only
the rows we know are in
draw all the whole glyphs, using the appropriate rows
draw any pieces of the last glyph, using the right rows
this way, the code would take advantage of knowing that
all glyphs are the same height and don't overlap.
one day...
*/
CLIPTETEXT(pDrawable, pGC, x, y, nglyph, ppci, pglyphBase);
case rgnOUT:
return;
}
pdstBase = mfbScanlineDeltaNoBankSwitch(pdstBase, ypos, widthDst);
widthGlyphs = widthGlyph * PGSZB;
#ifdef USE_LEFTBITS
glyphMask = endtab[widthGlyph];
glyphBytes = GLYPHWIDTHBYTESPADDED(*ppci);
#endif
if (nglyph >= PGSZB && widthGlyphs <= PPW)
{
while (nglyph >= PGSZB)
{
nglyph -= PGSZB;
xoff1 = xpos & PIM;
xoff2 = widthGlyph;
xoff3 = xoff2 + widthGlyph;
xoff4 = xoff3 + widthGlyph;
char1 = (glyphPointer) FONTGLYPHBITS(pglyphBase,(*ppci++));
char2 = (glyphPointer) FONTGLYPHBITS(pglyphBase,(*ppci++));
char3 = (glyphPointer) FONTGLYPHBITS(pglyphBase,(*ppci++));
char4 = (glyphPointer) FONTGLYPHBITS(pglyphBase,(*ppci++));
hTmp = h;
dst = mfbScanlineOffset(pdstBase, (xpos >> PWSH)); /* switch now */
#ifndef FASTCHARS
if (xoff1 + widthGlyphs <= PPW)
{
maskpartialbits (xoff1, widthGlyphs, startmask);
#endif
while (hTmp--)
{
GetBits4
#ifdef FASTCHARS
# if BITMAP_BIT_ORDER == MSBFirst
c >>= PPW - widthGlyphs;
# endif
FASTPUTBITS(OP(c), xoff1, widthGlyphs, dst);
#else
*(dst) = ((*dst) & ~startmask) | (OP(SCRRIGHT(c, xoff1)) & startmask);
#endif
mfbScanlineInc(dst, widthDst);
}
#ifndef FASTCHARS
}
else
{
maskPPWbits (xoff1, widthGlyphs, startmask, endmask);
nfirst = PPW - xoff1;
while (hTmp--)
{
GetBits4
dst[0] = (dst[0] & ~startmask) |
(OP(SCRRIGHT(c,xoff1)) & startmask);
dst[1] = (dst[1] & ~endmask) |
(OP(SCRLEFT(c,nfirst)) & endmask);
mfbScanlineInc(dst, widthDst);
}
}
#endif
xpos += widthGlyphs;
}
}
while(nglyph--)
{
xoff1 = xpos & PIM;
char1 = (glyphPointer) FONTGLYPHBITS(pglyphBase,(*ppci++));
hTmp = h;
dst = mfbScanlineOffset(pdstBase, (xpos >> PWSH));
#ifndef FASTCHARS
if (xoff1 + widthGlyph <= PPW)
{
maskpartialbits (xoff1, widthGlyph, startmask);
#endif
while (hTmp--)
{
#ifdef FASTCHARS
#ifdef USE_LEFTBITS
FASTGETBITS (char1,0,widthGlyph,c);
char1 = (glyphPointer) (((char *) char1) + glyphBytes);
#else
c = *char1++;
#if BITMAP_BIT_ORDER == MSBFirst
c >>= PPW - widthGlyph;
#endif
#endif
FASTPUTBITS (OP(c),xoff1,widthGlyph,dst);
#else
GetBits1
(*dst) = ((*dst) & ~startmask) | (OP(SCRRIGHT(c, xoff1)) & startmask);
#endif
mfbScanlineInc(dst, widthDst);
}
#ifndef FASTCHARS
}
else
{
maskPPWbits (xoff1, widthGlyph, startmask, endmask);
nfirst = PPW - xoff1;
while (hTmp--)
{
GetBits1
dst[0] = (dst[0] & ~startmask) |
(OP(SCRRIGHT(c,xoff1)) & startmask);
dst[1] = (dst[1] & ~endmask) |
(OP(SCRLEFT(c,nfirst)) & endmask);
mfbScanlineInc(dst, widthDst);
}
}
#endif
xpos += widthGlyph;
}
}
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