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- /* $XConsortium: mfbtegblt.c,v 5.7 91/05/26 09:02:16 rws Exp $ */
- /* Combined Purdue/PurduePlus patches, level 2.0, 1/17/89 */
- /***********************************************************
- Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts,
- and the Massachusetts Institute of Technology, Cambridge, 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 names of Digital or MIT 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.
-
- ******************************************************************/
- #include "X.h"
- #include "Xmd.h"
- #include "Xproto.h"
- #include "mfb.h"
- #include "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 <= 32 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
-
- #define GetBits4 c = (*char1++ << ShiftAmnt) | \
- SCRRIGHT (*char2++ << ShiftAmnt, xoff2) | \
- SCRRIGHT (*char3++ << ShiftAmnt, xoff3) | \
- SCRRIGHT (*char4++ << ShiftAmnt, xoff4);
- #else
- #define GetBits4 c = *char1++ | \
- SCRRIGHT (*char2++, xoff2) | \
- SCRRIGHT (*char3++, xoff3) | \
- SCRRIGHT (*char4++, xoff4);
- #endif
-
-
- #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 */
- unsigned char *pglyphBase; /* start of array of glyphs */
- {
- FontPtr pfont = pGC->font;
- int widthDst;
- unsigned int *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 int startmask, endmask;
- int nfirst; /* used if glyphs spans a longword boundary */
- BoxRec bbox; /* for clipping */
- int widthGlyphs;
- register unsigned int *dst;
- register unsigned int c;
- register int xoff1, xoff2, xoff3, xoff4;
- register glyphPointer char1, char2, char3, char4;
-
- #ifdef USE_LEFTBITS
- register int glyphMask;
- register unsigned int tmpSrc;
- register int glyphBytes;
- #endif
-
- if (!(pGC->planemask & 1))
- return;
-
- if (pDrawable->type == DRAWABLE_WINDOW)
- {
- pdstBase = (unsigned int *)
- (((PixmapPtr)(pDrawable->pScreen->devPrivate))->devPrivate.ptr);
- widthDst = (int)
- (((PixmapPtr)(pDrawable->pScreen->devPrivate))->devKind) >> 2;
- }
- else
- {
- pdstBase = (unsigned int *)(((PixmapPtr)pDrawable)->devPrivate.ptr);
- widthDst = (int)(((PixmapPtr)pDrawable)->devKind) >> 2;
- }
-
- 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 ((*pGC->pScreen->RectIn)(
- ((mfbPrivGC *)(pGC->devPrivates[mfbGCPrivateIndex].ptr))->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 += widthDst * ypos;
- widthGlyphs = widthGlyph << 2;
-
- #ifdef USE_LEFTBITS
- glyphMask = endtab[widthGlyph];
- glyphBytes = GLYPHWIDTHBYTESPADDED(*ppci);
- #endif
-
- if (nglyph >= 4 && widthGlyphs <= 32)
- {
- while (nglyph >= 4)
- {
- nglyph -= 4;
- xoff1 = xpos & 0x1f;
- 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 = pdstBase + (xpos >> 5);
-
- #ifndef FASTCHARS
- if (xoff1 + widthGlyphs <= 32)
- {
- maskpartialbits (xoff1, widthGlyphs, startmask);
- #endif
- while (hTmp--)
- {
- GetBits4
- #ifdef FASTCHARS
- # if BITMAP_BIT_ORDER == MSBFirst
- c >>= 32 - widthGlyphs;
- # endif
- FASTPUTBITS(OP(c), xoff1, widthGlyphs, dst);
- #else
- *(dst) = (*dst) & ~startmask | OP(SCRRIGHT(c, xoff1)) & startmask;
- #endif
- dst += widthDst;
- }
- #ifndef FASTCHARS
- }
- else
- {
- mask32bits (xoff1, widthGlyphs, startmask, endmask);
- nfirst = 32 - xoff1;
- while (hTmp--)
- {
- GetBits4
- dst[0] = dst[0] & ~startmask |
- OP(SCRRIGHT(c,xoff1)) & startmask;
- dst[1] = dst[1] & ~endmask |
- OP(SCRLEFT(c,nfirst)) & endmask;
- dst += widthDst;
- }
- }
- #endif
- xpos += widthGlyphs;
- }
- }
-
- while(nglyph--)
- {
- xoff1 = xpos & 0x1f;
- char1 = (glyphPointer) FONTGLYPHBITS(pglyphBase,(*ppci++));
- hTmp = h;
- dst = pdstBase + (xpos >> 5);
-
- #ifndef FASTCHARS
- if (xoff1 + widthGlyph <= 32)
- {
- 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 >>= 32 - widthGlyph;
- #endif
- #endif
- FASTPUTBITS (OP(c),xoff1,widthGlyph,dst);
- #else
- GetBits1
- (*dst) = (*dst) & ~startmask | OP(SCRRIGHT(c, xoff1)) & startmask;
- #endif
- dst += widthDst;
- }
- #ifndef FASTCHARS
- }
- else
- {
- mask32bits (xoff1, widthGlyph, startmask, endmask);
- nfirst = 32 - xoff1;
- while (hTmp--)
- {
- GetBits1
- dst[0] = dst[0] & ~startmask |
- OP(SCRRIGHT(c,xoff1)) & startmask;
- dst[1] = dst[1] & ~endmask |
- OP(SCRLEFT(c,nfirst)) & endmask;
- dst += widthDst;
- }
- }
- #endif
- xpos += widthGlyph;
- }
- }
-