471 lines
14 KiB
C
471 lines
14 KiB
C
/* $XFree86: xc/programs/Xserver/afb/afbimggblt.c,v 3.1tsi Exp $ */
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/* Combined Purdue/PurduePlus patches, level 2.0, 1/17/89 */
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/***********************************************************
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Copyright (c) 1987 X Consortium
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of the X Consortium shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from the X Consortium.
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Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the name of Digital not be
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used in advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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******************************************************************/
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/* $XConsortium: afbimggblt.c,v 5.17 94/04/17 20:28:25 dpw Exp $ */
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#include "X.h"
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#include "Xmd.h"
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#include "Xproto.h"
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#include "afb.h"
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#include "fontstruct.h"
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#include "dixfontstr.h"
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#include "gcstruct.h"
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#include "windowstr.h"
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#include "scrnintstr.h"
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#include "pixmapstr.h"
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#include "regionstr.h"
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#include "maskbits.h"
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/*
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we should eventually special-case fixed-width fonts for ImageText.
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this works for fonts with glyphs <= 32 bits wide.
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the clipping calculations are done for worst-case fonts.
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we make no assumptions about the heights, widths, or bearings
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of the glyphs. if we knew that the glyphs are all the same height,
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we could clip the tops and bottoms per clipping box, rather
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than per character per clipping box. if we knew that the glyphs'
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left and right bearings were wlle-behaved, we could clip a single
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character at the start, output until the last unclipped
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character, and then clip the last one. this is all straightforward
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to determine based on max-bounds and min-bounds from the font.
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there is some inefficiency introduced in the per-character
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clipping to make what's going on clearer.
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(it is possible, for example, for a font to be defined in which the
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next-to-last character in a font would be clipped out, but the last
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one wouldn't. the code below deals with this.)
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Image text looks at the bits in the glyph and the fg and bg in the
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GC. it paints a rectangle, as defined in the protocol dcoument,
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and the paints the characters.
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the register allocations for startmask and endmask may not
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be the right thing. are there two other deserving candidates?
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xoff, pdst, pglyph, and tmpSrc seem like the right things, though.
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*/
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void
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afbImageGlyphBlt(pDrawable, pGC, x, y, nglyph, ppci, pglyphBase)
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DrawablePtr pDrawable;
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GC *pGC;
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int x, y;
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unsigned int nglyph;
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CharInfoPtr *ppci; /* array of character info */
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pointer pglyphBase; /* start of array of glyphs */
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{
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ExtentInfoRec info; /* used by QueryGlyphExtents() */
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BoxRec bbox; /* string's bounding box */
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xRectangle backrect;/* backing rectangle to paint.
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in the general case, NOT necessarily
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the same as the string's bounding box
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*/
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CharInfoPtr pci;
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int xorg, yorg; /* origin of drawable in bitmap */
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int widthDst; /* width of dst in longwords */
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/* these keep track of the character origin */
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PixelType *pdstBase;
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/* points to longword with character origin */
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int xchar; /* xorigin of char (mod 32) */
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/* these are used for placing the glyph */
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register int xoff; /* x offset of left edge of glyph (mod 32) */
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register PixelType *pdst;
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/* pointer to current longword in dst */
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register int d;
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int depthDst;
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int sizeDst;
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int hSave;
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int w; /* width of glyph in bits */
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int h; /* height of glyph */
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int widthGlyph; /* width of glyph, in bytes */
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unsigned char rrops[AFB_MAX_DEPTH];
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register unsigned char *pglyph;
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/* pointer to current row of glyph */
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unsigned char *pglyphSave;
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/* used for putting down glyph */
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register PixelType tmpSrc;
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/* for getting bits from glyph */
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register PixelType startmask;
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register PixelType endmask;
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register int nFirst;/* bits of glyph in current longword */
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PixelType *pdstSave;
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int oldFill;
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afbPrivGC *pPriv = (afbPrivGC *)(pGC->devPrivates[afbGCPrivateIndex].ptr);
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xorg = pDrawable->x;
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yorg = pDrawable->y;
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afbGetPixelWidthSizeDepthAndPointer(pDrawable, widthDst, sizeDst, depthDst,
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pdstBase);
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QueryGlyphExtents(pGC->font, ppci, (unsigned long)nglyph, &info);
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backrect.x = x;
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backrect.y = y - FONTASCENT(pGC->font);
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backrect.width = info.overallWidth;
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backrect.height = FONTASCENT(pGC->font) + FONTDESCENT(pGC->font);
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x += xorg;
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y += yorg;
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bbox.x1 = x + info.overallLeft;
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bbox.x2 = x + info.overallRight;
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bbox.y1 = y - info.overallAscent;
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bbox.y2 = y + info.overallDescent;
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oldFill = pGC->fillStyle;
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pGC->fillStyle = FillSolid;
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afbReduceRop (pGC->alu, pGC->bgPixel, pGC->planemask, pGC->depth,
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pPriv->rrops);
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afbPolyFillRect(pDrawable, pGC, 1, &backrect);
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pGC->fillStyle = oldFill;
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afbReduceRop (pGC->alu, pGC->fgPixel, pGC->planemask, pGC->depth,
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pPriv->rrops);
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afbReduceRop (GXcopy, pGC->fgPixel, pGC->planemask, pGC->depth, rrops);
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/* the faint-hearted can open their eyes now */
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switch (RECT_IN_REGION(pGC->pScreen, pGC->pCompositeClip, &bbox)) {
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case rgnOUT:
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break;
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case rgnIN:
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pdstBase = afbScanlineNoBankSwitch(pdstBase, x, y, widthDst);
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xchar = x & PIM;
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while(nglyph--) {
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pci = *ppci;
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pglyphSave = FONTGLYPHBITS(pglyphBase, pci);
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w = pci->metrics.rightSideBearing - pci->metrics.leftSideBearing;
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hSave = pci->metrics.ascent + pci->metrics.descent;
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widthGlyph = GLYPHWIDTHBYTESPADDED(pci);
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/* start at top scanline of glyph */
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pdstSave = afbScanlineDelta(pdstBase, -pci->metrics.ascent,
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widthDst);
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/* find correct word in scanline and x offset within it
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for left edge of glyph
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*/
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xoff = xchar + pci->metrics.leftSideBearing;
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if (xoff > PLST) {
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pdstSave++;
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xoff &= PIM;
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} else if (xoff < 0) {
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xoff += PPW;
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pdstSave--;
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}
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for (d = 0; d < depthDst; d++) {
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h = hSave;
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pdst = pdstSave;
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pdstSave += sizeDst; /* @@@ NEXT PLANE @@@ */
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pglyph = pglyphSave;
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if ((xoff + w) <= PPW) {
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/* glyph all in one longword */
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maskpartialbits(xoff, w, startmask);
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switch (rrops[d]) {
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case RROP_BLACK:
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while (h--) {
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getleftbits(pglyph, w, tmpSrc);
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*pdst &= ~(SCRRIGHT(tmpSrc, xoff) & startmask);
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pglyph += widthGlyph;
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afbScanlineInc(pdst, widthDst);
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}
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break;
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case RROP_WHITE:
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while (h--) {
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getleftbits(pglyph, w, tmpSrc);
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*pdst |= SCRRIGHT(tmpSrc, xoff) & startmask;
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pglyph += widthGlyph;
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afbScanlineInc(pdst, widthDst);
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}
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break;
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case RROP_NOP:
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break;
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}
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} else {
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/* glyph crosses longword boundary */
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maskPPWbits(xoff, w, startmask, endmask);
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nFirst = PPW - xoff;
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switch (rrops[d]) {
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case RROP_BLACK:
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while (h--) {
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getleftbits(pglyph, w, tmpSrc);
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*pdst &= ~(SCRRIGHT(tmpSrc, xoff) & startmask);
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*(pdst+1) &= ~(SCRLEFT(tmpSrc, nFirst) & endmask);
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pglyph += widthGlyph;
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afbScanlineInc(pdst, widthDst);
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}
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break;
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case RROP_WHITE:
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while (h--) {
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getleftbits(pglyph, w, tmpSrc);
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*pdst |= SCRRIGHT(tmpSrc, xoff) & startmask;
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*(pdst+1) |= SCRLEFT(tmpSrc, nFirst) & endmask;
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pglyph += widthGlyph;
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afbScanlineInc(pdst, widthDst);
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}
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break;
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case RROP_NOP:
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break;
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}
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} /* glyph crosses longwords boundary */
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} /* depth loop */
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/* update character origin */
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x += pci->metrics.characterWidth;
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xchar += pci->metrics.characterWidth;
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if (xchar > PLST) {
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xchar -= PPW;
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pdstBase++;
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} else if (xchar < 0) {
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xchar += PPW;
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pdstBase--;
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}
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ppci++;
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} /* while nglyph-- */
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break;
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case rgnPART:
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{
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afbTEXTPOS *ppos;
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int nbox;
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BoxPtr pbox;
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RegionPtr cclip;
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int xpos; /* x position of char origin */
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int i;
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BoxRec clip;
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int leftEdge, rightEdge;
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int topEdge, bottomEdge;
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int glyphRow; /* first row of glyph not wholly
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clipped out */
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int glyphCol; /* leftmost visible column of glyph */
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#if GETLEFTBITS_ALIGNMENT > 1
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int getWidth; /* bits to get from glyph */
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#endif
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if(!(ppos = (afbTEXTPOS *)ALLOCATE_LOCAL(nglyph * sizeof(afbTEXTPOS))))
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return;
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pdstBase = afbScanlineNoBankSwitch(pdstBase, x, y, widthDst);
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xpos = x;
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xchar = xpos & PIM;
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for (i = 0; i < nglyph; i++) {
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pci = ppci[i];
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ppos[i].xpos = xpos;
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ppos[i].xchar = xchar;
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ppos[i].leftEdge = xpos + pci->metrics.leftSideBearing;
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ppos[i].rightEdge = xpos + pci->metrics.rightSideBearing;
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ppos[i].topEdge = y - pci->metrics.ascent;
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ppos[i].bottomEdge = y + pci->metrics.descent;
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ppos[i].pdstBase = pdstBase;
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ppos[i].widthGlyph = GLYPHWIDTHBYTESPADDED(pci);
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xpos += pci->metrics.characterWidth;
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xchar += pci->metrics.characterWidth;
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if (xchar > PLST) {
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xchar &= PIM;
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pdstBase++;
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} else if (xchar < 0) {
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xchar += PPW;
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pdstBase--;
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}
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}
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cclip = pGC->pCompositeClip;
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pbox = REGION_RECTS(cclip);
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nbox = REGION_NUM_RECTS(cclip);
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/* HACK ALERT
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since we continue out of the loop below so often, it
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is easier to increment pbox at the top than at the end.
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don't try this at home.
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*/
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pbox--;
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while(nbox--) {
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pbox++;
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clip.x1 = max(bbox.x1, pbox->x1);
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clip.y1 = max(bbox.y1, pbox->y1);
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clip.x2 = min(bbox.x2, pbox->x2);
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clip.y2 = min(bbox.y2, pbox->y2);
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if ((clip.x2<=clip.x1) || (clip.y2<=clip.y1))
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continue;
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for(i=0; i<nglyph; i++) {
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pci = ppci[i];
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xchar = ppos[i].xchar;
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/* clip the left and right edges */
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if (ppos[i].leftEdge < clip.x1)
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leftEdge = clip.x1;
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else
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leftEdge = ppos[i].leftEdge;
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if (ppos[i].rightEdge > clip.x2)
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rightEdge = clip.x2;
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else
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rightEdge = ppos[i].rightEdge;
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w = rightEdge - leftEdge;
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if (w <= 0)
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continue;
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/* clip the top and bottom edges */
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if (ppos[i].topEdge < clip.y1)
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topEdge = clip.y1;
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else
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topEdge = ppos[i].topEdge;
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if (ppos[i].bottomEdge > clip.y2)
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bottomEdge = clip.y2;
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else
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bottomEdge = ppos[i].bottomEdge;
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hSave = bottomEdge - topEdge;
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if (hSave <= 0)
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continue;
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glyphRow = (topEdge - y) + pci->metrics.ascent;
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widthGlyph = ppos[i].widthGlyph;
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pglyphSave = FONTGLYPHBITS(pglyphBase, pci);
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pglyphSave += (glyphRow * widthGlyph);
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glyphCol = (leftEdge - ppos[i].xpos) -
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(pci->metrics.leftSideBearing);
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#if GETLEFTBITS_ALIGNMENT > 1
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getWidth = w + glyphCol;
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#endif
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pdstSave = afbScanlineDelta(ppos[i].pdstBase, -(y-topEdge),
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widthDst);
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xoff = xchar + (leftEdge - ppos[i].xpos);
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if (xoff > PLST) {
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xoff &= PIM;
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pdstSave++;
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} else if (xoff < 0) {
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xoff += PPW;
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pdstSave--;
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}
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for (d = 0; d < depthDst; d++) {
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h = hSave;
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pdst = pdstSave;
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pdstSave += sizeDst; /* @@@ NEXT PLANE @@@ */
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pglyph = pglyphSave;
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if ((xoff + w) <= PPW) {
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maskpartialbits(xoff, w, startmask);
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switch (rrops[d]) {
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case RROP_BLACK:
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while (h--) {
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getshiftedleftbits(pglyph, glyphCol, getWidth, tmpSrc);
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*pdst &= ~(SCRRIGHT(tmpSrc, xoff) & startmask);
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pglyph += widthGlyph;
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afbScanlineInc(pdst, widthDst);
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}
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break;
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case RROP_WHITE:
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while (h--) {
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getshiftedleftbits(pglyph, glyphCol, getWidth, tmpSrc);
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*pdst |= SCRRIGHT(tmpSrc, xoff) & startmask;
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pglyph += widthGlyph;
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afbScanlineInc(pdst, widthDst);
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}
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break;
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case RROP_NOP:
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break;
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}
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} else {
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maskPPWbits(xoff, w, startmask, endmask);
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nFirst = PPW - xoff;
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switch (rrops[d]) {
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case RROP_BLACK:
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while (h--) {
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getshiftedleftbits(pglyph, glyphCol, getWidth, tmpSrc);
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*pdst &= ~(SCRRIGHT(tmpSrc, xoff) & startmask);
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*(pdst+1) &= ~(SCRLEFT(tmpSrc, nFirst) & endmask);
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pglyph += widthGlyph;
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afbScanlineInc(pdst, widthDst);
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}
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break;
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case RROP_WHITE:
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while (h--) {
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getshiftedleftbits(pglyph, glyphCol, getWidth, tmpSrc);
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*pdst |= SCRRIGHT(tmpSrc, xoff) & startmask;
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*(pdst+1) |= SCRLEFT(tmpSrc, nFirst) & endmask;
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pglyph += widthGlyph;
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afbScanlineInc(pdst, widthDst);
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}
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break;
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case RROP_NOP:
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break;
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}
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}
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} /* depth */
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} /* for each glyph */
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} /* while nbox-- */
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DEALLOCATE_LOCAL(ppos);
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break;
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}
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default:
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break;
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}
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}
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