home *** CD-ROM | disk | FTP | other *** search
- /*
- * $XConsortium: bitmaputils.c,v 1.3 91/05/31 14:23:06 rws Exp $
- *
- * Copyright 1990 Massachusetts Institute of Technology
- *
- * 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, and that the name of M.I.T. not be used in advertising or
- * publicity pertaining to distribution of the software without specific,
- * written prior permission. M.I.T. makes no representations about the
- * suitability of this software for any purpose. It is provided "as is"
- * without express or implied warranty.
- *
- * M.I.T. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL M.I.T.
- * 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 "fontfilest.h"
- #include "bitmap.h"
-
- #ifndef MAXSHORT
- #define MAXSHORT 32767
- #endif
-
- #ifndef MINSHORT
- #define MINSHORT -32768
- #endif
-
- static xCharInfo initMinMetrics = {
- MAXSHORT, MAXSHORT, MAXSHORT, MAXSHORT, MAXSHORT, 0xFFFF};
- static xCharInfo initMaxMetrics = {
- MINSHORT, MINSHORT, MINSHORT, MINSHORT, MINSHORT, 0x0000};
-
- #define MINMAX(field,ci) \
- if (minbounds->field > (ci)->field) \
- minbounds->field = (ci)->field; \
- if (maxbounds->field < (ci)->field) \
- maxbounds->field = (ci)->field;
-
- void
- bitmapComputeFontBounds(pFont)
- FontPtr pFont;
- {
- BitmapFontPtr bitmapFont = (BitmapFontPtr) pFont->fontPrivate;
- int nchars;
- int r,
- c;
- CharInfoPtr ci,
- *pci;
- int maxOverlap;
- int overlap;
- xCharInfo *minbounds,
- *maxbounds;
- int i;
- int numneg = 0, numpos = 0;
-
- if (bitmapFont->bitmapExtra) {
- minbounds = &bitmapFont->bitmapExtra->info.minbounds;
- maxbounds = &bitmapFont->bitmapExtra->info.maxbounds;
- } else {
- minbounds = &pFont->info.minbounds;
- maxbounds = &pFont->info.maxbounds;
- }
- *minbounds = initMinMetrics;
- *maxbounds = initMaxMetrics;
- maxOverlap = MINSHORT;
- nchars = bitmapFont->num_chars;
- for (i = 0, ci = bitmapFont->metrics; i < nchars; i++, ci++) {
- MINMAX(ascent, &ci->metrics);
- MINMAX(descent, &ci->metrics);
- MINMAX(leftSideBearing, &ci->metrics);
- MINMAX(rightSideBearing, &ci->metrics);
- MINMAX(characterWidth, &ci->metrics);
- if (ci->metrics.characterWidth < 0)
- numneg++;
- else
- numpos++;
- minbounds->attributes &= ci->metrics.attributes;
- maxbounds->attributes |= ci->metrics.attributes;
- overlap = ci->metrics.rightSideBearing - ci->metrics.characterWidth;
- if (maxOverlap < overlap)
- maxOverlap = overlap;
- }
- if (bitmapFont->bitmapExtra) {
- if (numneg > numpos)
- bitmapFont->bitmapExtra->info.drawDirection = RightToLeft;
- else
- bitmapFont->bitmapExtra->info.drawDirection = LeftToRight;
- bitmapFont->bitmapExtra->info.maxOverlap = maxOverlap;
- minbounds = &pFont->info.minbounds;
- maxbounds = &pFont->info.maxbounds;
- *minbounds = initMinMetrics;
- *maxbounds = initMaxMetrics;
- pci = bitmapFont->encoding;
- maxOverlap = MINSHORT;
- for (r = pFont->info.firstRow; r <= pFont->info.lastRow; r++) {
- for (c = pFont->info.firstCol; c <= pFont->info.lastCol; c++) {
- ci = *pci++;
- if (ci) {
- MINMAX(ascent, &ci->metrics);
- MINMAX(descent, &ci->metrics);
- MINMAX(leftSideBearing, &ci->metrics);
- MINMAX(rightSideBearing, &ci->metrics);
- MINMAX(characterWidth, &ci->metrics);
- if (ci->metrics.characterWidth < 0)
- numneg++;
- else
- numpos++;
- minbounds->attributes &= ci->metrics.attributes;
- maxbounds->attributes |= ci->metrics.attributes;
- overlap = ci->metrics.rightSideBearing -
- ci->metrics.characterWidth;
- if (maxOverlap < overlap)
- maxOverlap = overlap;
- }
- }
- }
- }
- if (numneg > numpos)
- pFont->info.drawDirection = RightToLeft;
- else
- pFont->info.drawDirection = LeftToRight;
- pFont->info.maxOverlap = maxOverlap;
- }
-
- void
- bitmapComputeFontInkBounds(pFont)
- FontPtr pFont;
- {
- BitmapFontPtr bitmapFont = (BitmapFontPtr) pFont->fontPrivate;
- int nchars;
- int r,
- c;
- CharInfoPtr *pci,
- cit;
- xCharInfo *ci;
- int offset;
- xCharInfo *minbounds,
- *maxbounds;
- int i;
-
- if (!bitmapFont->ink_metrics) {
- if (bitmapFont->bitmapExtra) {
- bitmapFont->bitmapExtra->info.ink_minbounds = bitmapFont->bitmapExtra->info.minbounds;
- bitmapFont->bitmapExtra->info.ink_maxbounds = bitmapFont->bitmapExtra->info.maxbounds;
- }
- pFont->info.ink_minbounds = pFont->info.minbounds;
- pFont->info.ink_maxbounds = pFont->info.maxbounds;
- } else {
- if (bitmapFont->bitmapExtra) {
- minbounds = &bitmapFont->bitmapExtra->info.ink_minbounds;
- maxbounds = &bitmapFont->bitmapExtra->info.ink_maxbounds;
- } else {
- minbounds = &pFont->info.ink_minbounds;
- maxbounds = &pFont->info.ink_maxbounds;
- }
- *minbounds = initMinMetrics;
- *maxbounds = initMaxMetrics;
- nchars = bitmapFont->num_chars;
- for (i = 0, ci = bitmapFont->ink_metrics; i < nchars; i++, ci++) {
- MINMAX(ascent, ci);
- MINMAX(descent, ci);
- MINMAX(leftSideBearing, ci);
- MINMAX(rightSideBearing, ci);
- MINMAX(characterWidth, ci);
- minbounds->attributes &= ci->attributes;
- maxbounds->attributes |= ci->attributes;
- }
- if (bitmapFont->bitmapExtra) {
- minbounds = &pFont->info.ink_minbounds;
- maxbounds = &pFont->info.ink_maxbounds;
- *minbounds = initMinMetrics;
- *maxbounds = initMaxMetrics;
- pci = bitmapFont->encoding;
- for (r = pFont->info.firstRow; r <= pFont->info.lastRow; r++) {
- for (c = pFont->info.firstCol; c <= pFont->info.lastCol; c++) {
- cit = *pci++;
- if (cit) {
- offset = cit - bitmapFont->metrics;
- ci = &bitmapFont->ink_metrics[offset];
- MINMAX(ascent, ci);
- MINMAX(descent, ci);
- MINMAX(leftSideBearing, ci);
- MINMAX(rightSideBearing, ci);
- MINMAX(characterWidth, ci);
- minbounds->attributes &= ci->attributes;
- maxbounds->attributes |= ci->attributes;
- }
- }
- }
- }
- }
- }
-
- Bool
- bitmapAddInkMetrics(pFont)
- FontPtr pFont;
- {
- BitmapFontPtr bitmapFont;
- int i;
-
- bitmapFont = (BitmapFontPtr) pFont->fontPrivate;
- bitmapFont->ink_metrics = (xCharInfo *) xalloc(bitmapFont->num_chars * sizeof(xCharInfo));
- if (!bitmapFont->ink_metrics)
- return FALSE;
- for (i = 0; i < bitmapFont->num_chars; i++)
- FontCharInkMetrics(pFont, &bitmapFont->metrics[i], &bitmapFont->ink_metrics[i]);
- pFont->info.inkMetrics = TRUE;
- return TRUE;
- }
-
- /* ARGSUSED */
- int
- bitmapComputeWeight(pFont)
- FontPtr pFont;
- {
- return 10;
- }
-