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-rw-r--r--src/fontfile/fontscale.c453
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diff --git a/src/fontfile/fontscale.c b/src/fontfile/fontscale.c
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+/* $Xorg: fontscale.c,v 1.5 2001/02/09 02:04:03 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 "fntfilst.h"
+#ifdef _XOPEN_SOURCE
+#include <math.h>
+#else
+#define _XOPEN_SOURCE /* to get prototype for hypot on some systems */
+#include <math.h>
+#undef _XOPEN_SOURCE
+#endif
+
+Bool
+FontFileAddScaledInstance (entry, vals, pFont, bitmapName)
+ FontEntryPtr entry;
+ FontScalablePtr vals;
+ FontPtr pFont;
+ char *bitmapName;
+{
+ FontScalableEntryPtr scalable;
+ FontScalableExtraPtr extra;
+ FontScaledPtr new;
+ int newsize;
+
+ scalable = &entry->u.scalable;
+ extra = scalable->extra;
+ if (extra->numScaled == extra->sizeScaled)
+ {
+ newsize = extra->sizeScaled + 4;
+ new = (FontScaledPtr) xrealloc (extra->scaled,
+ newsize * sizeof (FontScaledRec));
+ if (!new)
+ return FALSE;
+ extra->sizeScaled = newsize;
+ extra->scaled = new;
+ }
+ new = &extra->scaled[extra->numScaled++];
+ new->vals = *vals;
+ new->pFont = pFont;
+ new->bitmap = (FontEntryPtr) bitmapName;
+ if (pFont)
+ pFont->fpePrivate = (pointer) entry;
+ return TRUE;
+}
+
+/* Must call this after the directory is sorted */
+
+void
+FontFileSwitchStringsToBitmapPointers (dir)
+ FontDirectoryPtr dir;
+{
+ int s;
+ int b;
+ int i;
+ FontEntryPtr scalable;
+ FontEntryPtr nonScalable;
+ FontScaledPtr scaled;
+ FontScalableExtraPtr extra;
+
+ scalable = dir->scalable.entries;
+ nonScalable = dir->nonScalable.entries;
+ for (s = 0; s < dir->scalable.used; s++)
+ {
+ extra = scalable[s].u.scalable.extra;
+ scaled = extra->scaled;
+ for (i = 0; i < extra->numScaled; i++)
+ for (b = 0; b < dir->nonScalable.used; b++)
+ if (nonScalable[b].name.name == (char *) scaled[i].bitmap)
+ scaled[i].bitmap = &nonScalable[b];
+ }
+}
+
+void
+FontFileRemoveScaledInstance (entry, pFont)
+ FontEntryPtr entry;
+ FontPtr pFont;
+{
+ FontScalableEntryPtr scalable;
+ FontScalableExtraPtr extra;
+ int i;
+
+ scalable = &entry->u.scalable;
+ extra = scalable->extra;
+ for (i = 0; i < extra->numScaled; i++)
+ {
+ if (extra->scaled[i].pFont == pFont)
+ {
+ if (extra->scaled[i].vals.ranges)
+ xfree (extra->scaled[i].vals.ranges);
+ extra->numScaled--;
+ for (; i < extra->numScaled; i++)
+ extra->scaled[i] = extra->scaled[i+1];
+ }
+ }
+}
+
+Bool
+FontFileCompleteXLFD (vals, def)
+ register FontScalablePtr vals;
+ FontScalablePtr def;
+{
+ FontResolutionPtr res;
+ int num_res;
+ double sx, sy, temp_matrix[4];
+ double pixel_setsize_adjustment = 1.0;
+ /*
+ * If two of the three vertical scale values are specified, compute the
+ * third. If all three are specified, make sure they are consistent
+ * (within a pixel)
+ *
+ * One purpose of this procedure is to complete XLFD names in a
+ * repeatable manner. That is, if the user partially specifies
+ * a name (say, pixelsize but not pointsize), the results generated
+ * here result in a fully specified name that will result in the
+ * same font.
+ */
+
+ res = GetClientResolutions(&num_res);
+
+ if (!(vals->values_supplied & PIXELSIZE_MASK) ||
+ !(vals->values_supplied & POINTSIZE_MASK))
+ {
+ /* If resolution(s) unspecified and cannot be computed from
+ pixelsize and pointsize, get appropriate defaults. */
+
+ if (num_res)
+ {
+ if (vals->x <= 0)
+ vals->x = res->x_resolution;
+ if (vals->y <= 0)
+ vals->y = res->y_resolution;
+ }
+
+ if (vals->x <= 0)
+ vals->x = def->x;
+ if (vals->y <= 0)
+ vals->y = def->y;
+ }
+ else
+ {
+ /* If needed, compute resolution values from the pixel and
+ pointsize information we were given. This problem is
+ overdetermined (four equations, two unknowns), but we don't
+ check for inconsistencies here. If they exist, they will
+ show up in later tests for the point and pixel sizes. */
+
+ if (vals->y <= 0)
+ {
+ double x = hypot(vals->pixel_matrix[1], vals->pixel_matrix[3]);
+ double y = hypot(vals->point_matrix[1], vals->point_matrix[3]);
+ if (y < EPS) return FALSE;
+ vals->y = (int)(x * 72.27 / y + .5);
+ }
+ if (vals->x <= 0)
+ {
+ /* If the pixelsize was given as an array, or as a scalar that
+ has been normalized for the pixel shape, we have enough
+ information to compute a separate horizontal resolution */
+
+ if ((vals->values_supplied & PIXELSIZE_MASK) == PIXELSIZE_ARRAY ||
+ (vals->values_supplied & PIXELSIZE_MASK) ==
+ PIXELSIZE_SCALAR_NORMALIZED)
+ {
+ double x = hypot(vals->pixel_matrix[0], vals->pixel_matrix[2]);
+ double y = hypot(vals->point_matrix[0], vals->point_matrix[2]);
+ if (y < EPS) return FALSE;
+ vals->x = (int)(x * 72.27 / y + .5);
+ }
+ else
+ {
+ /* Not enough information in the pixelsize array. Just
+ assume the pixels are square. */
+ vals->x = vals->y;
+ }
+ }
+ }
+
+ if (vals->x <= 0 || vals->y <= 0) return FALSE;
+
+ /* If neither pixelsize nor pointsize is defined, take the pointsize
+ from the defaults structure we've been passed. */
+ if (!(vals->values_supplied & PIXELSIZE_MASK) &&
+ !(vals->values_supplied & POINTSIZE_MASK))
+ {
+ if (num_res)
+ {
+ vals->point_matrix[0] =
+ vals->point_matrix[3] = (double)res->point_size / 10.0;
+ vals->point_matrix[1] =
+ vals->point_matrix[2] = 0;
+ vals->values_supplied = (vals->values_supplied & ~POINTSIZE_MASK) |
+ POINTSIZE_SCALAR;
+ }
+ else if (def->values_supplied & POINTSIZE_MASK)
+ {
+ vals->point_matrix[0] = def->point_matrix[0];
+ vals->point_matrix[1] = def->point_matrix[1];
+ vals->point_matrix[2] = def->point_matrix[2];
+ vals->point_matrix[3] = def->point_matrix[3];
+ vals->values_supplied = (vals->values_supplied & ~POINTSIZE_MASK) |
+ (def->values_supplied & POINTSIZE_MASK);
+ }
+ else return FALSE;
+ }
+
+ /* At this point, at least two of the three vertical scale values
+ should be specified. Our job now is to compute the missing ones
+ and check for agreement between overspecified values */
+
+ /* If pixelsize was specified by a scalar, we need to fix the matrix
+ now that we know the resolutions. */
+ if ((vals->values_supplied & PIXELSIZE_MASK) == PIXELSIZE_SCALAR)
+ {
+ /* pixel_setsize_adjustment used below to modify permissible
+ error in pixel/pointsize matching, since multiplying a
+ number rounded to integer changes the amount of the error
+ caused by the rounding */
+
+ pixel_setsize_adjustment = (double)vals->x / (double)vals->y;
+ vals->pixel_matrix[0] *= pixel_setsize_adjustment;
+ vals->values_supplied = vals->values_supplied & ~PIXELSIZE_MASK |
+ PIXELSIZE_SCALAR_NORMALIZED;
+ }
+
+ sx = (double)vals->x / 72.27;
+ sy = (double)vals->y / 72.27;
+
+ /* If a pointsize was specified, make sure pixelsize is consistent
+ to within 1 pixel, then replace pixelsize with a consistent
+ floating-point value. */
+
+ if (vals->values_supplied & POINTSIZE_MASK)
+ {
+ recompute_pixelsize: ;
+ temp_matrix[0] = vals->point_matrix[0] * sx;
+ temp_matrix[1] = vals->point_matrix[1] * sy;
+ temp_matrix[2] = vals->point_matrix[2] * sx;
+ temp_matrix[3] = vals->point_matrix[3] * sy;
+ if (vals->values_supplied & PIXELSIZE_MASK)
+ {
+ if (fabs(vals->pixel_matrix[0] - temp_matrix[0]) >
+ pixel_setsize_adjustment ||
+ fabs(vals->pixel_matrix[1] - temp_matrix[1]) > 1 ||
+ fabs(vals->pixel_matrix[2] - temp_matrix[2]) > 1 ||
+ fabs(vals->pixel_matrix[3] - temp_matrix[3]) > 1)
+ return FALSE;
+ }
+ if ((vals->values_supplied & PIXELSIZE_MASK) == PIXELSIZE_ARRAY &&
+ (vals->values_supplied & POINTSIZE_MASK) == POINTSIZE_SCALAR)
+ {
+ /* In the special case that pixelsize came as an array and
+ pointsize as a scalar, recompute the pointsize matrix
+ from the pixelsize matrix. */
+ goto recompute_pointsize;
+ }
+
+ /* Refresh pixel matrix with precise values computed from
+ pointsize and resolution. */
+ vals->pixel_matrix[0] = temp_matrix[0];
+ vals->pixel_matrix[1] = temp_matrix[1];
+ vals->pixel_matrix[2] = temp_matrix[2];
+ vals->pixel_matrix[3] = temp_matrix[3];
+
+ /* Set values_supplied for pixel to match that for point */
+ vals->values_supplied =
+ (vals->values_supplied & ~PIXELSIZE_MASK) |
+ (((vals->values_supplied & POINTSIZE_MASK) == POINTSIZE_ARRAY) ?
+ PIXELSIZE_ARRAY : PIXELSIZE_SCALAR_NORMALIZED);
+ }
+ else
+ {
+ /* Pointsize unspecified... compute from pixel size and
+ resolutions */
+ recompute_pointsize: ;
+ if (fabs(sx) < EPS || fabs(sy) < EPS) return FALSE;
+ vals->point_matrix[0] = vals->pixel_matrix[0] / sx;
+ vals->point_matrix[1] = vals->pixel_matrix[1] / sy;
+ vals->point_matrix[2] = vals->pixel_matrix[2] / sx;
+ vals->point_matrix[3] = vals->pixel_matrix[3] / sy;
+
+ /* Set values_supplied for pixel to match that for point */
+ vals->values_supplied =
+ (vals->values_supplied & ~POINTSIZE_MASK) |
+ (((vals->values_supplied & PIXELSIZE_MASK) == PIXELSIZE_ARRAY) ?
+ POINTSIZE_ARRAY : POINTSIZE_SCALAR);
+
+ /* If we computed scalar pointsize from scalar pixelsize, round
+ pointsize to decipoints and recompute pixelsize so we end up
+ with a repeatable name */
+ if ((vals->values_supplied & POINTSIZE_MASK) == POINTSIZE_SCALAR)
+ {
+ /* Off-diagonal elements should be zero since no matrix was
+ specified. */
+ vals->point_matrix[0] =
+ (double)(int)(vals->point_matrix[0] * 10.0 + .5) / 10.0;
+ vals->point_matrix[3] =
+ (double)(int)(vals->point_matrix[3] * 10.0 + .5) / 10.0;
+ goto recompute_pixelsize;
+ }
+ }
+
+ /* We've succeeded. Round everything to a few decimal places
+ for repeatability. */
+
+ vals->pixel_matrix[0] = xlfd_round_double(vals->pixel_matrix[0]);
+ vals->pixel_matrix[1] = xlfd_round_double(vals->pixel_matrix[1]);
+ vals->pixel_matrix[2] = xlfd_round_double(vals->pixel_matrix[2]);
+ vals->pixel_matrix[3] = xlfd_round_double(vals->pixel_matrix[3]);
+ vals->point_matrix[0] = xlfd_round_double(vals->point_matrix[0]);
+ vals->point_matrix[1] = xlfd_round_double(vals->point_matrix[1]);
+ vals->point_matrix[2] = xlfd_round_double(vals->point_matrix[2]);
+ vals->point_matrix[3] = xlfd_round_double(vals->point_matrix[3]);
+
+ /* Fill in the deprecated fields for the benefit of rasterizers
+ that do not handle the matrices. */
+ vals->point = vals->point_matrix[3] * 10;
+ vals->pixel = vals->pixel_matrix[3];
+
+ return TRUE;
+}
+
+static Bool
+MatchScalable (a, b)
+ FontScalablePtr a, b;
+{
+ int i;
+
+ /* Some asymmetry here: we assume that the first argument (a) is
+ the table entry and the second (b) the item we're trying to match
+ (the key). We'll consider the fonts matched if the relevant
+ metrics match *and* if a) the table entry doesn't have charset
+ subsetting or b) the table entry has identical charset subsetting
+ to that in the key. We could add logic to check if the table
+ entry has a superset of the charset required by the key, but
+ we'll resist the urge for now. */
+
+#define EQUAL(a,b) ((a)[0] == (b)[0] && \
+ (a)[1] == (b)[1] && \
+ (a)[2] == (b)[2] && \
+ (a)[3] == (b)[3])
+
+ if (!(a->x == b->x &&
+ a->y == b->y &&
+ (a->width == b->width || a->width == 0 || b->width == 0) &&
+ (!(b->values_supplied & PIXELSIZE_MASK) ||
+ (a->values_supplied & PIXELSIZE_MASK) ==
+ (b->values_supplied & PIXELSIZE_MASK) &&
+ EQUAL(a->pixel_matrix, b->pixel_matrix)) &&
+ (!(b->values_supplied & POINTSIZE_MASK) ||
+ (a->values_supplied & POINTSIZE_MASK) ==
+ (b->values_supplied & POINTSIZE_MASK) &&
+ EQUAL(a->point_matrix, b->point_matrix)) &&
+ (a->nranges == 0 || a->nranges == b->nranges)))
+ return FALSE;
+
+ for (i = 0; i < a->nranges; i++)
+ if (a->ranges[i].min_char_low != b->ranges[i].min_char_low ||
+ a->ranges[i].min_char_high != b->ranges[i].min_char_high ||
+ a->ranges[i].max_char_low != b->ranges[i].max_char_low ||
+ a->ranges[i].max_char_high != b->ranges[i].max_char_high)
+ return FALSE;
+
+ return TRUE;
+}
+
+FontScaledPtr
+FontFileFindScaledInstance (entry, vals, noSpecificSize)
+ FontEntryPtr entry;
+ FontScalablePtr vals;
+{
+ FontScalableEntryPtr scalable;
+ FontScalableExtraPtr extra;
+ FontScalablePtr mvals;
+ int dist, i;
+ int mini;
+ double mindist;
+ register double temp, sum=0.0;
+
+#define NORMDIFF(a, b) ( \
+ temp = (a)[0] - (b)[0], \
+ sum = temp * temp, \
+ temp = (a)[1] - (b)[1], \
+ sum += temp * temp, \
+ temp = (a)[2] - (b)[2], \
+ sum += temp * temp, \
+ temp = (a)[3] - (b)[3], \
+ sum + temp * temp )
+
+ scalable = &entry->u.scalable;
+ extra = scalable->extra;
+ if (noSpecificSize && extra->numScaled)
+ {
+ mini = 0;
+ mindist = NORMDIFF(extra->scaled[0].vals.point_matrix,
+ vals->point_matrix);
+ for (i = 1; i < extra->numScaled; i++)
+ {
+ if (extra->scaled[i].pFont &&
+ !extra->scaled[i].pFont->info.cachable) continue;
+ mvals = &extra->scaled[i].vals;
+ dist = NORMDIFF(mvals->point_matrix, vals->point_matrix);
+ if (dist < mindist)
+ {
+ mindist = dist;
+ mini = i;
+ }
+ }
+ if (extra->scaled[mini].pFont &&
+ !extra->scaled[mini].pFont->info.cachable) return 0;
+ return &extra->scaled[mini];
+ }
+ else
+ {
+ /* See if we've scaled to this value yet */
+ for (i = 0; i < extra->numScaled; i++)
+ {
+ if (extra->scaled[i].pFont &&
+ !extra->scaled[i].pFont->info.cachable) continue;
+ if (MatchScalable (&extra->scaled[i].vals, vals))
+ return &extra->scaled[i];
+ }
+ }
+ return 0;
+}
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