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-rw-r--r--src/util/fontutil.c416
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diff --git a/src/util/fontutil.c b/src/util/fontutil.c
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+/* $Xorg: fontutil.c,v 1.4 2001/02/09 02:04:04 xorgcvs Exp $ */
+
+/*
+
+Copyright 1991, 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.
+
+*/
+
+/*
+ * Author: Keith Packard, MIT X Consortium
+ */
+
+#include "fontmisc.h"
+#include "fontstruct.h"
+#include "FSproto.h"
+
+/* Define global here... doesn't hurt the servers, and avoids
+ unresolved references in font clients. */
+
+static int defaultGlyphCachingMode = DEFAULT_GLYPH_CACHING_MODE;
+int glyphCachingMode = DEFAULT_GLYPH_CACHING_MODE;
+
+void
+GetGlyphs(font, count, chars, fontEncoding, glyphcount, glyphs)
+ FontPtr font;
+ unsigned long count;
+ unsigned char *chars;
+ FontEncoding fontEncoding;
+ unsigned long *glyphcount; /* RETURN */
+ CharInfoPtr *glyphs; /* RETURN */
+{
+ (*font->get_glyphs) (font, count, chars, fontEncoding, glyphcount, glyphs);
+}
+
+#define MIN(a,b) ((a)<(b)?(a):(b))
+#define MAX(a,b) ((a)>(b)?(a):(b))
+
+void
+QueryGlyphExtents(pFont, charinfo, count, info)
+ FontPtr pFont;
+ CharInfoPtr *charinfo;
+ unsigned long count;
+ ExtentInfoRec *info;
+{
+ register unsigned long i;
+ xCharInfo *pCI;
+
+ info->drawDirection = pFont->info.drawDirection;
+
+ info->fontAscent = pFont->info.fontAscent;
+ info->fontDescent = pFont->info.fontDescent;
+
+ if (count != 0) {
+
+ pCI = &((*charinfo)->metrics); charinfo++;
+ /* ignore nonexisting characters when calculating text extents */
+ if ( !((pCI->characterWidth == 0)
+ && (pCI->rightSideBearing == 0)
+ && (pCI->leftSideBearing == 0)
+ && (pCI->ascent == 0)
+ && (pCI->descent == 0)) ) {
+ info->overallAscent = pCI->ascent;
+ info->overallDescent = pCI->descent;
+ info->overallLeft = pCI->leftSideBearing;
+ info->overallRight = pCI->rightSideBearing;
+ info->overallWidth = pCI->characterWidth;
+ }
+
+ if (pFont->info.constantMetrics && pFont->info.noOverlap) {
+ info->overallWidth *= count;
+ info->overallRight += (info->overallWidth -
+ pCI->characterWidth);
+ } else {
+ for (i = 1; i < count; i++) {
+ pCI = &((*charinfo)->metrics); charinfo++;
+ /* ignore nonexisting characters when calculating extents */
+ if ( !((pCI->characterWidth == 0)
+ && (pCI->rightSideBearing == 0)
+ && (pCI->leftSideBearing == 0)
+ && (pCI->ascent == 0)
+ && (pCI->descent == 0)) ) {
+ info->overallAscent = MAX(
+ info->overallAscent,
+ pCI->ascent);
+ info->overallDescent = MAX(
+ info->overallDescent,
+ pCI->descent);
+ info->overallLeft = MIN(
+ info->overallLeft,
+ info->overallWidth + pCI->leftSideBearing);
+ info->overallRight = MAX(
+ info->overallRight,
+ info->overallWidth + pCI->rightSideBearing);
+ /*
+ * yes, this order is correct; overallWidth IS incremented
+ * last
+ */
+ info->overallWidth += pCI->characterWidth;
+ }
+ }
+ }
+ } else {
+ info->overallAscent = 0;
+ info->overallDescent = 0;
+ info->overallWidth = 0;
+ info->overallLeft = 0;
+ info->overallRight = 0;
+ }
+}
+
+Bool
+QueryTextExtents(pFont, count, chars, info)
+ FontPtr pFont;
+ unsigned long count;
+ unsigned char *chars;
+ ExtentInfoRec *info;
+{
+ xCharInfo **charinfo;
+ unsigned long n;
+ FontEncoding encoding;
+ int cm;
+ int i;
+ unsigned long t;
+ xCharInfo *defaultChar = 0;
+ unsigned char defc[2];
+ int firstReal;
+
+ charinfo = (xCharInfo **) xalloc(count * sizeof(xCharInfo *));
+ if (!charinfo)
+ return FALSE;
+ encoding = TwoD16Bit;
+ if (pFont->info.lastRow == 0)
+ encoding = Linear16Bit;
+ (*pFont->get_metrics) (pFont, count, chars, encoding, &n, charinfo);
+
+ /* Do default character substitution as get_metrics doesn't */
+
+#define IsNonExistentChar(ci) (!(ci) || \
+ (ci)->ascent == 0 && \
+ (ci)->descent == 0 && \
+ (ci)->leftSideBearing == 0 && \
+ (ci)->rightSideBearing == 0 && \
+ (ci)->characterWidth == 0)
+
+ firstReal = n;
+ defc[0] = pFont->info.defaultCh >> 8;
+ defc[1] = pFont->info.defaultCh;
+ (*pFont->get_metrics) (pFont, 1, defc, encoding, &t, &defaultChar);
+ if ((IsNonExistentChar (defaultChar)))
+ defaultChar = 0;
+ for (i = 0; i < n; i++)
+ {
+ if ((IsNonExistentChar (charinfo[i])))
+ {
+ if (!defaultChar)
+ continue;
+ charinfo[i] = defaultChar;
+ }
+ if (firstReal == n)
+ firstReal = i;
+ }
+ cm = pFont->info.constantMetrics;
+ pFont->info.constantMetrics = FALSE;
+ QueryGlyphExtents(pFont, (CharInfoPtr*) charinfo + firstReal,
+ n - firstReal, info);
+ pFont->info.constantMetrics = cm;
+ xfree(charinfo);
+ return TRUE;
+}
+
+Bool
+ParseGlyphCachingMode(str)
+ char *str;
+{
+ if (!strcmp(str, "none")) defaultGlyphCachingMode = CACHING_OFF;
+ else if (!strcmp(str, "all")) defaultGlyphCachingMode = CACHE_ALL_GLYPHS;
+ else if (!strcmp(str, "16")) defaultGlyphCachingMode = CACHE_16_BIT_GLYPHS;
+ else return FALSE;
+ return TRUE;
+}
+
+void
+InitGlyphCaching()
+{
+ /* Set glyphCachingMode to the mode the server hopes to
+ support. DDX drivers that do not support the requested level
+ of glyph caching can call SetGlyphCachingMode to lower the
+ level of support.
+ */
+
+ glyphCachingMode = defaultGlyphCachingMode;
+}
+
+/* ddxen can call SetGlyphCachingMode to inform us of what level of glyph
+ * caching they can support.
+ */
+void
+SetGlyphCachingMode(newmode)
+ int newmode;
+{
+ if ( (glyphCachingMode > newmode) && (newmode >= 0) )
+ glyphCachingMode = newmode;
+}
+
+#define range_alloc_granularity 16
+#define mincharp(p) ((p)->min_char_low + ((p)->min_char_high << 8))
+#define maxcharp(p) ((p)->max_char_low + ((p)->max_char_high << 8))
+
+/* add_range(): Add range to a list of ranges, with coalescence */
+int
+add_range(newrange, nranges, range, charset_subset)
+fsRange *newrange;
+int *nranges;
+fsRange **range;
+Bool charset_subset;
+{
+ int first, last, middle;
+ unsigned long keymin, keymax;
+ unsigned long ptrmin, ptrmax;
+ fsRange *ptr, *ptr1, *ptr2, *endptr;
+
+ /* There are two different ways to treat ranges:
+
+ 1) Charset subsetting (support of the HP XLFD enhancements), in
+ which a range of 0x1234,0x3456 means all numbers between
+ 0x1234 and 0x3456, and in which min and max might be swapped.
+
+ 2) Row/column ranges, in which a range of 0x1234,0x3456 means the
+ ranges 0x1234-0x1256, 0x1334-0x1356, ... , 0x3434-0x3456.
+ This is for support of glyph caching.
+
+ The choice of treatment is selected with the "charset_subset"
+ flag */
+
+ /* If newrange covers multiple rows; break up the rows */
+ if (!charset_subset && newrange->min_char_high != newrange->max_char_high)
+ {
+ int i, err;
+ fsRange temprange;
+ for (i = newrange->min_char_high;
+ i <= newrange->max_char_high;
+ i++)
+ {
+ temprange.min_char_low = newrange->min_char_low;
+ temprange.max_char_low = newrange->max_char_low;
+ temprange.min_char_high = temprange.max_char_high = i;
+ err = add_range(&temprange, nranges, range, charset_subset);
+ if (err != Successful) break;
+ }
+ return err;
+ }
+
+ keymin = mincharp(newrange);
+ keymax = maxcharp(newrange);
+
+ if (charset_subset && keymin > keymax)
+ {
+ unsigned long temp = keymin;
+ keymin = keymax;
+ keymax = temp;
+ }
+
+ /* add_range() maintains a sorted list; this makes possible coalescence
+ and binary searches */
+
+ /* Binary search for a range with which the new range can merge */
+
+ first = middle = 0;
+ last = *nranges - 1;
+ while (last >= first)
+ {
+ middle = (first + last) / 2;
+ ptr = (*range) + middle;
+ ptrmin = mincharp(ptr);
+ ptrmax = maxcharp(ptr);
+
+ if (ptrmin > 0 && keymax < ptrmin - 1) last = middle - 1;
+ else if (keymin > ptrmax + 1) first = middle + 1;
+ else if (!charset_subset)
+ {
+ /* We might have a range with which to merge... IF the
+ result doesn't cross rows */
+ if (newrange->min_char_high != ptr->min_char_high)
+ last = first - 1; /* Force adding a new range */
+ break;
+ }
+ else break; /* We have at least one range with which we can merge */
+ }
+
+ if (last < first)
+ {
+ /* Search failed; we need to add a new range to the list. */
+
+ /* Grow the list if necessary */
+ if (*nranges == 0 || *range == (fsRange *)0)
+ {
+ *range = (fsRange *)xalloc(range_alloc_granularity *
+ SIZEOF(fsRange));
+ *nranges = 0;
+ }
+ else if (!(*nranges % range_alloc_granularity))
+ {
+ *range = (fsRange *)xrealloc((char *)*range,
+ (*nranges + range_alloc_granularity) *
+ SIZEOF(fsRange));
+ }
+
+ /* If alloc failed, just return a null list */
+ if (*range == (fsRange *)0)
+ {
+ *nranges = 0;
+ return AllocError;
+ }
+
+ /* Should new entry go *at* or *after* ptr? */
+ ptr = (*range) + middle;
+ if (middle < *nranges && keymin > ptrmin) ptr++; /* after */
+
+ /* Open up a space for our new range */
+ memmove((char *)(ptr + 1),
+ (char *)ptr,
+ (char *)(*range + *nranges) - (char *)ptr);
+
+ /* Insert the new range */
+ ptr->min_char_low = keymin & 0xff;
+ ptr->min_char_high = keymin >> 8;
+ ptr->max_char_low = keymax & 0xff;
+ ptr->max_char_high = keymax >> 8;
+
+ /* Update range count */
+ (*nranges)++;
+
+ /* Done */
+ return Successful;
+ }
+
+ /* Join our new range to that pointed to by "ptr" */
+ if (keymin < ptrmin)
+ {
+ ptr->min_char_low = keymin & 0xff;
+ ptr->min_char_high = keymin >> 8;
+ }
+ if (keymax > ptrmax)
+ {
+ ptr->max_char_low = keymax & 0xff;
+ ptr->max_char_high = keymax >> 8;
+ }
+
+ ptrmin = mincharp(ptr);
+ ptrmax = maxcharp(ptr);
+
+ endptr = *range + *nranges;
+
+ for (ptr1 = ptr; ptr1 >= *range; ptr1--)
+ {
+ if (ptrmin <= maxcharp(ptr1) + 1)
+ {
+ if (!charset_subset && ptr->min_char_high != ptr1->min_char_high)
+ break;
+ if (ptrmin >= mincharp(ptr1))
+ ptrmin = mincharp(ptr1);
+ }
+ else break;
+ }
+ for (ptr2 = ptr; ptr2 < endptr; ptr2++)
+ {
+ if ((ptr2->min_char_low == 0 && ptr2->min_char_high == 0) ||
+ ptrmax >= mincharp(ptr2) - 1)
+ {
+ if (!charset_subset && ptr->min_char_high != ptr2->min_char_high)
+ break;
+ if (ptrmax <= maxcharp(ptr2))
+ ptrmax = maxcharp(ptr2);
+ }
+ else break;
+ }
+
+ /* We need to coalesce ranges between ptr1 and ptr2 exclusive */
+ ptr1++;
+ ptr2--;
+ if (ptr1 != ptr2)
+ {
+ memmove(ptr1, ptr2, (char *)endptr - (char *)ptr2);
+ *nranges -= (ptr2 - ptr1);
+ }
+
+ /* Write the new range into the range list */
+ ptr1->min_char_low = ptrmin & 0xff;
+ ptr1->min_char_high = ptrmin >> 8;
+ ptr1->max_char_low = ptrmax & 0xff;
+ ptr1->max_char_high = ptrmax >> 8;
+
+ return Successful;
+}
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