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+/***********************************************************
+
+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.
+
+******************************************************************/
+/* $Xorg: mfbplygblt.c,v 1.4 2001/02/09 02:05:19 xorgcvs Exp $ */
+
+#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 "pixmapstr.h"
+#include "scrnintstr.h"
+#include "regionstr.h"
+#include "maskbits.h"
+#include "miscstruct.h"
+
+/*
+ we should eventually special-case fixed-width fonts, although
+its more important for ImageText, which is meant for terminal
+emulators.
+
+ this works for fonts with glyphs <= 32 bits wide.
+
+ the clipping calculations are done for worst-case fonts.
+we make no assumptions about the heights, widths, or bearings
+of the glyphs. if we knew that the glyphs are all the same height,
+we could clip the tops and bottoms per clipping box, rather
+than per character per clipping box. if we knew that the glyphs'
+left and right bearings were well-behaved, we could clip a single
+character at the start, output until the last unclipped
+character, and then clip the last one. this is all straightforward
+to determine based on max-bounds and min-bounds from the font.
+ there is some inefficiency introduced in the per-character
+clipping to make what's going on clearer.
+
+ (it is possible, for example, for a font to be defined in which the
+next-to-last character in a font would be clipped out, but the last
+one wouldn't. the code below deals with this.)
+
+ PolyText looks at the fg color and the rasterop; mfbValidateGC
+swaps in the right routine after looking at the reduced ratserop
+in the private field of the GC.
+
+ the register allocations are provisional; in particualr startmask and
+endmask might not be the right things. pglyph, xoff, pdst, and tmpSrc
+are fairly obvious, though.
+
+ to avoid source proliferation, this file is compiled
+three times:
+ MFBPOLYGLYPHBLT OPEQ
+ mfbPolyGlyphBltWhite |=
+ mfbPolyGlyphBltBlack &=~
+ mfbPolyGlyphBltInvert ^=
+*/
+
+void
+MFBPOLYGLYPHBLT(pDrawable, pGC, x, y, nglyph, ppci, pglyphBase)
+ DrawablePtr pDrawable;
+ GCPtr pGC;
+ int x, y;
+ unsigned int nglyph;
+ CharInfoPtr *ppci; /* array of character info */
+ pointer pglyphBase; /* start of array of glyphs (unused in R5) */
+{
+ ExtentInfoRec info; /* used by QueryGlyphExtents() */
+ BoxRec bbox; /* string's bounding box */
+
+ CharInfoPtr pci;
+ int xorg, yorg; /* origin of drawable in bitmap */
+ int widthDst; /* width of dst in longwords */
+
+ /* these keep track of the character origin */
+ PixelType *pdstBase;
+ /* points to longword with character origin */
+ int xchar; /* xorigin of char (mod 32) */
+
+ /* these are used for placing the glyph */
+ register int xoff; /* x offset of left edge of glyph (mod 32) */
+ register PixelType *pdst;
+ /* pointer to current longword in dst */
+
+ int w; /* width of glyph in bits */
+ int h; /* height of glyph */
+ int widthGlyph; /* width of glyph, in bytes */
+ register unsigned char *pglyph;
+ /* pointer to current row of glyph */
+
+ /* used for putting down glyph */
+ register PixelType tmpSrc;
+ /* for getting bits from glyph */
+ register PixelType startmask;
+ register PixelType endmask;
+ register int nFirst;/* bits of glyph in current longword */
+
+ if (!(pGC->planemask & 1))
+ return;
+
+ xorg = pDrawable->x;
+ yorg = pDrawable->y;
+ mfbGetPixelWidthAndPointer(pDrawable, widthDst, pdstBase);
+
+ x += xorg;
+ y += yorg;
+
+ QueryGlyphExtents(pGC->font, ppci, (unsigned long)nglyph, &info);
+ bbox.x1 = x + info.overallLeft;
+ bbox.x2 = x + info.overallRight;
+ bbox.y1 = y - info.overallAscent;
+ bbox.y2 = y + info.overallDescent;
+
+ switch (RECT_IN_REGION(pGC->pScreen,
+ ((mfbPrivGC *)(pGC->devPrivates[mfbGCPrivateIndex].ptr))->pCompositeClip, &bbox))
+ {
+ case rgnOUT:
+ break;
+ case rgnIN:
+ pdstBase = mfbScanlineNoBankSwitch(pdstBase, x, y, widthDst);
+ xchar = x & PIM;
+
+ while(nglyph--)
+ {
+ pci = *ppci;
+ pglyph = FONTGLYPHBITS(pglyphBase, pci);
+ w = pci->metrics.rightSideBearing - pci->metrics.leftSideBearing;
+ h = pci->metrics.ascent + pci->metrics.descent;
+ widthGlyph = GLYPHWIDTHBYTESPADDED(pci);
+
+ /* start at top scanline of glyph */
+ pdst = mfbScanlineDelta(pdstBase, -pci->metrics.ascent, widthDst);
+
+ /* find correct word in scanline and x offset within it
+ for left edge of glyph
+ */
+ xoff = xchar + pci->metrics.leftSideBearing;
+ if (xoff > PLST)
+ {
+ pdst++;
+ xoff &= PIM;
+ }
+ else if (xoff < 0)
+ {
+ xoff += PPW;
+ pdst--;
+ }
+
+ if ((xoff + w) <= PPW)
+ {
+ /* glyph all in one longword */
+ maskpartialbits(xoff, w, startmask);
+ while (h--)
+ {
+ getleftbits(pglyph, w, tmpSrc);
+ *pdst OPEQ (SCRRIGHT(tmpSrc, xoff) & startmask);
+ pglyph += widthGlyph;
+ mfbScanlineInc(pdst, widthDst);
+ }
+ }
+ else
+ {
+ /* glyph crosses longword boundary */
+ maskPPWbits(xoff, w, startmask, endmask);
+ nFirst = PPW - xoff;
+ while (h--)
+ {
+ getleftbits(pglyph, w, tmpSrc);
+ *pdst OPEQ (SCRRIGHT(tmpSrc, xoff) & startmask);
+ *(pdst+1) OPEQ (SCRLEFT(tmpSrc, nFirst) & endmask);
+ pglyph += widthGlyph;
+ mfbScanlineInc(pdst, widthDst);
+ }
+ } /* glyph crosses longwords boundary */
+
+ /* update character origin */
+ x += pci->metrics.characterWidth;
+ xchar += pci->metrics.characterWidth;
+ if (xchar > PLST)
+ {
+ xchar -= PPW;
+ pdstBase++;
+ }
+ else if (xchar < 0)
+ {
+ xchar += PPW;
+ pdstBase--;
+ }
+ ppci++;
+ } /* while nglyph-- */
+ break;
+ case rgnPART:
+ {
+ TEXTPOS *ppos;
+ RegionPtr cclip;
+ int nbox;
+ BoxPtr pbox;
+ int xpos; /* x position of char origin */
+ int i;
+ BoxRec clip;
+ int leftEdge, rightEdge;
+ int topEdge, bottomEdge;
+ int glyphRow; /* first row of glyph not wholly
+ clipped out */
+ int glyphCol; /* leftmost visible column of glyph */
+ int getWidth; /* bits to get from glyph */
+
+ if(!(ppos = (TEXTPOS *)ALLOCATE_LOCAL(nglyph * sizeof(TEXTPOS))))
+ return;
+
+ pdstBase = mfbScanlineNoBankSwitch(pdstBase, x, y, widthDst);
+ xpos = x;
+ xchar = xpos & PIM;
+
+ for (i=0; i<nglyph; i++)
+ {
+ pci = ppci[i];
+
+ ppos[i].xpos = xpos;
+ ppos[i].xchar = xchar;
+ ppos[i].leftEdge = xpos + pci->metrics.leftSideBearing;
+ ppos[i].rightEdge = xpos + pci->metrics.rightSideBearing;
+ ppos[i].topEdge = y - pci->metrics.ascent;
+ ppos[i].bottomEdge = y + pci->metrics.descent;
+ ppos[i].pdstBase = pdstBase;
+ ppos[i].widthGlyph = GLYPHWIDTHBYTESPADDED(pci);
+
+ xpos += pci->metrics.characterWidth;
+ xchar += pci->metrics.characterWidth;
+ if (xchar > PLST)
+ {
+ xchar &= PIM;
+ pdstBase++;
+ }
+ else if (xchar < 0)
+ {
+ xchar += PPW;
+ pdstBase--;
+ }
+ }
+
+ cclip = ((mfbPrivGC *)(pGC->devPrivates[mfbGCPrivateIndex].ptr))->pCompositeClip;
+ pbox = REGION_RECTS(cclip);
+ nbox = REGION_NUM_RECTS(cclip);
+
+ for (; --nbox >= 0; pbox++)
+ {
+ clip.x1 = max(bbox.x1, pbox->x1);
+ clip.y1 = max(bbox.y1, pbox->y1);
+ clip.x2 = min(bbox.x2, pbox->x2);
+ clip.y2 = min(bbox.y2, pbox->y2);
+ if ((clip.x2<=clip.x1) || (clip.y2<=clip.y1))
+ continue;
+
+ for(i=0; i<nglyph; i++)
+ {
+ pci = ppci[i];
+ xchar = ppos[i].xchar;
+
+ /* clip the left and right edges */
+ if (ppos[i].leftEdge < clip.x1)
+ leftEdge = clip.x1;
+ else
+ leftEdge = ppos[i].leftEdge;
+
+ if (ppos[i].rightEdge > clip.x2)
+ rightEdge = clip.x2;
+ else
+ rightEdge = ppos[i].rightEdge;
+
+ w = rightEdge - leftEdge;
+ if (w <= 0)
+ continue;
+
+ /* clip the top and bottom edges */
+ if (ppos[i].topEdge < clip.y1)
+ topEdge = clip.y1;
+ else
+ topEdge = ppos[i].topEdge;
+
+ if (ppos[i].bottomEdge > clip.y2)
+ bottomEdge = clip.y2;
+ else
+ bottomEdge = ppos[i].bottomEdge;
+
+ h = bottomEdge - topEdge;
+ if (h <= 0)
+ continue;
+
+ glyphRow = (topEdge - y) + pci->metrics.ascent;
+ widthGlyph = ppos[i].widthGlyph;
+ pglyph = FONTGLYPHBITS(pglyphBase, pci);
+ pglyph += (glyphRow * widthGlyph);
+
+ pdst = mfbScanlineDelta(ppos[i].pdstBase, -(y-topEdge), widthDst);
+
+ glyphCol = (leftEdge - ppos[i].xpos) -
+ (pci->metrics.leftSideBearing);
+ getWidth = w + glyphCol;
+ xoff = xchar + (leftEdge - ppos[i].xpos);
+ if (xoff > PLST)
+ {
+ xoff &= PIM;
+ pdst++;
+ }
+ else if (xoff < 0)
+ {
+ xoff += PPW;
+ pdst--;
+ }
+
+ if ((xoff + w) <= PPW)
+ {
+ maskpartialbits(xoff, w, startmask);
+ while (h--)
+ {
+ getshiftedleftbits(pglyph, glyphCol, getWidth, tmpSrc);
+ *pdst OPEQ (SCRRIGHT(tmpSrc, xoff) & startmask);
+ pglyph += widthGlyph;
+ mfbScanlineInc(pdst, widthDst);
+ }
+ }
+ else
+ {
+ maskPPWbits(xoff, w, startmask, endmask);
+ nFirst = PPW - xoff;
+ while (h--)
+ {
+ getshiftedleftbits(pglyph, glyphCol, getWidth, tmpSrc);
+ *pdst OPEQ (SCRRIGHT(tmpSrc, xoff) & startmask);
+ *(pdst+1) OPEQ (SCRLEFT(tmpSrc, nFirst) & endmask);
+ pglyph += widthGlyph;
+ mfbScanlineInc(pdst, widthDst);
+ }
+ }
+ } /* for each glyph */
+ } /* while nbox-- */
+ DEALLOCATE_LOCAL(ppos);
+ break;
+ }
+ default:
+ break;
+ }
+}
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