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+/* GRAPHITE2 LICENSING
+
+ Copyright 2010, SIL International
+ All rights reserved.
+
+ This library is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation; either version 2.1 of License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should also have received a copy of the GNU Lesser General Public
+ License along with this library in the file named "LICENSE".
+ If not, write to the Free Software Foundation, 51 Franklin Street,
+ Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
+ internet at http://www.fsf.org/licenses/lgpl.html.
+
+Alternatively, the contents of this file may be used under the terms of the
+Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
+License, as published by the Free Software Foundation, either version 2
+of the License or (at your option) any later version.
+*/
+#include <algorithm>
+#include <limits>
+#include <cmath>
+#include <string>
+#include <functional>
+#include "inc/Collider.h"
+#include "inc/Segment.h"
+#include "inc/Slot.h"
+#include "inc/GlyphCache.h"
+#include "inc/Sparse.h"
+
+#define ISQRT2 0.707106781f
+
+// Possible rounding error for subbox boundaries: 0.016 = 1/64 = 1/256 * 4
+// (values in font range from 0..256)
+// #define SUBBOX_RND_ERR 0.016
+
+using namespace graphite2;
+
+//// SHIFT-COLLIDER ////
+
+// Initialize the Collider to hold the basic movement limits for the
+// target slot, the one we are focusing on fixing.
+bool ShiftCollider::initSlot(Segment *seg, Slot *aSlot, const Rect &limit, float margin, float marginWeight,
+ const Position &currShift, const Position &currOffset, int dir, GR_MAYBE_UNUSED json * const dbgout)
+{
+ int i;
+ float mx, mn;
+ float a, shift;
+ const GlyphCache &gc = seg->getFace()->glyphs();
+ unsigned short gid = aSlot->gid();
+ if (!gc.check(gid))
+ return false;
+ const BBox &bb = gc.getBoundingBBox(gid);
+ const SlantBox &sb = gc.getBoundingSlantBox(gid);
+ //float sx = aSlot->origin().x + currShift.x;
+ //float sy = aSlot->origin().y + currShift.y;
+ if (currOffset.x != 0.f || currOffset.y != 0.f)
+ _limit = Rect(limit.bl - currOffset, limit.tr - currOffset);
+ else
+ _limit = limit;
+ // For a ShiftCollider, these indices indicate which vector we are moving by:
+ // each _ranges represents absolute space with respect to the origin of the slot. Thus take into account true origins but subtract the vmin for the slot
+ for (i = 0; i < 4; ++i)
+ {
+ switch (i) {
+ case 0 : // x direction
+ mn = _limit.bl.x + currOffset.x;
+ mx = _limit.tr.x + currOffset.x;
+ _len[i] = bb.xa - bb.xi;
+ a = currOffset.y + currShift.y;
+ _ranges[i].initialise<XY>(mn, mx, margin, marginWeight, a);
+ break;
+ case 1 : // y direction
+ mn = _limit.bl.y + currOffset.y;
+ mx = _limit.tr.y + currOffset.y;
+ _len[i] = bb.ya - bb.yi;
+ a = currOffset.x + currShift.x;
+ _ranges[i].initialise<XY>(mn, mx, margin, marginWeight, a);
+ break;
+ case 2 : // sum (negatively sloped diagonal boundaries)
+ // pick closest x,y limit boundaries in s direction
+ shift = currOffset.x + currOffset.y + currShift.x + currShift.y;
+ mn = -2 * min(currShift.x - _limit.bl.x, currShift.y - _limit.bl.y) + shift;
+ mx = 2 * min(_limit.tr.x - currShift.x, _limit.tr.y - currShift.y) + shift;
+ _len[i] = sb.sa - sb.si;
+ a = currOffset.x - currOffset.y + currShift.x - currShift.y;
+ _ranges[i].initialise<SD>(mn, mx, margin / ISQRT2, marginWeight, a);
+ break;
+ case 3 : // diff (positively sloped diagonal boundaries)
+ // pick closest x,y limit boundaries in d direction
+ shift = currOffset.x - currOffset.y + currShift.x - currShift.y;
+ mn = -2 * min(currShift.x - _limit.bl.x, _limit.tr.y - currShift.y) + shift;
+ mx = 2 * min(_limit.tr.x - currShift.x, currShift.y - _limit.bl.y) + shift;
+ _len[i] = sb.da - sb.di;
+ a = currOffset.x + currOffset.y + currShift.x + currShift.y;
+ _ranges[i].initialise<SD>(mn, mx, margin / ISQRT2, marginWeight, a);
+ break;
+ }
+ }
+
+ _target = aSlot;
+ if ((dir & 1) == 0)
+ {
+ // For LTR, switch and negate x limits.
+ _limit.bl.x = -1 * limit.tr.x;
+ //_limit.tr.x = -1 * limit.bl.x;
+ }
+ _currOffset = currOffset;
+ _currShift = currShift;
+ _origin = aSlot->origin() - currOffset; // the original anchor position of the glyph
+
+ _margin = margin;
+ _marginWt = marginWeight;
+
+ SlotCollision *c = seg->collisionInfo(aSlot);
+ _seqClass = c->seqClass();
+ _seqProxClass = c->seqProxClass();
+ _seqOrder = c->seqOrder();
+ return true;
+}
+
+template <class O>
+float sdm(float vi, float va, float mx, float my, O op)
+{
+ float res = 2 * mx - vi;
+ if (op(res, vi + 2 * my))
+ {
+ res = va + 2 * my;
+ if (op(res, 2 * mx - va))
+ res = mx + my;
+ }
+ return res;
+}
+
+// Mark an area with a cost that can vary along the x or y axis. The region is expressed in terms of the centre of the target glyph in each axis
+void ShiftCollider::addBox_slope(bool isx, const Rect &box, const BBox &bb, const SlantBox &sb, const Position &org, float weight, float m, bool minright, int axis)
+{
+ float a, c;
+ switch (axis) {
+ case 0 :
+ if (box.bl.y < org.y + bb.ya && box.tr.y > org.y + bb.yi && box.width() > 0)
+ {
+ a = org.y + 0.5f * (bb.yi + bb.ya);
+ c = 0.5f * (bb.xi + bb.xa);
+ if (isx)
+ _ranges[axis].weighted<XY>(box.bl.x - c, box.tr.x - c, weight, a, m,
+ (minright ? box.tr.x : box.bl.x) - c, a, 0, false);
+ else
+ _ranges[axis].weighted<XY>(box.bl.x - c, box.tr.x - c, weight, a, 0, 0, org.y,
+ m * (a * a + sqr((minright ? box.tr.y : box.bl.y) - 0.5f * (bb.yi + bb.ya))), false);
+ }
+ break;
+ case 1 :
+ if (box.bl.x < org.x + bb.xa && box.tr.x > org.x + bb.xi && box.height() > 0)
+ {
+ a = org.x + 0.5f * (bb.xi + bb.xa);
+ c = 0.5f * (bb.yi + bb.ya);
+ if (isx)
+ _ranges[axis].weighted<XY>(box.bl.y - c, box.tr.y - c, weight, a, 0, 0, org.x,
+ m * (a * a + sqr((minright ? box.tr.x : box.bl.x) - 0.5f * (bb.xi + bb.xa))), false);
+ else
+ _ranges[axis].weighted<XY>(box.bl.y - c, box.tr.y - c, weight, a, m,
+ (minright ? box.tr.y : box.bl.y) - c, a, 0, false);
+ }
+ break;
+ case 2 :
+ if (box.bl.x - box.tr.y < org.x - org.y + sb.da && box.tr.x - box.bl.y > org.x - org.y + sb.di)
+ {
+ float d = org.x - org.y + 0.5f * (sb.di + sb.da);
+ c = 0.5f * (sb.si + sb.sa);
+ float smax = min(2 * box.tr.x - d, 2 * box.tr.y + d);
+ float smin = max(2 * box.bl.x - d, 2 * box.bl.y + d);
+ if (smin > smax) return;
+ float si;
+ a = d;
+ if (isx)
+ si = 2 * (minright ? box.tr.x : box.bl.x) - a;
+ else
+ si = 2 * (minright ? box.tr.y : box.bl.y) + a;
+ _ranges[axis].weighted<SD>(smin - c, smax - c, weight / 2, a, m / 2, si, 0, 0, isx);
+ }
+ break;
+ case 3 :
+ if (box.bl.x + box.bl.y < org.x + org.y + sb.sa && box.tr.x + box.tr.y > org.x + org.y + sb.si)
+ {
+ float s = org.x + org.y + 0.5f * (sb.si + sb.sa);
+ c = 0.5f * (sb.di + sb.da);
+ float dmax = min(2 * box.tr.x - s, s - 2 * box.bl.y);
+ float dmin = max(2 * box.bl.x - s, s - 2 * box.tr.y);
+ if (dmin > dmax) return;
+ float di;
+ a = s;
+ if (isx)
+ di = 2 * (minright ? box.tr.x : box.bl.x) - a;
+ else
+ di = 2 * (minright ? box.tr.y : box.bl.y) + a;
+ _ranges[axis].weighted<SD>(dmin - c, dmax - c, weight / 2, a, m / 2, di, 0, 0, !isx);
+ }
+ break;
+ default :
+ break;
+ }
+ return;
+}
+
+// Mark an area with an absolute cost, making it completely inaccessible.
+inline void ShiftCollider::removeBox(const Rect &box, const BBox &bb, const SlantBox &sb, const Position &org, int axis)
+{
+ float c;
+ switch (axis) {
+ case 0 :
+ if (box.bl.y < org.y + bb.ya && box.tr.y > org.y + bb.yi && box.width() > 0)
+ {
+ c = 0.5f * (bb.xi + bb.xa);
+ _ranges[axis].exclude(box.bl.x - c, box.tr.x - c);
+ }
+ break;
+ case 1 :
+ if (box.bl.x < org.x + bb.xa && box.tr.x > org.x + bb.xi && box.height() > 0)
+ {
+ c = 0.5f * (bb.yi + bb.ya);
+ _ranges[axis].exclude(box.bl.y - c, box.tr.y - c);
+ }
+ break;
+ case 2 :
+ if (box.bl.x - box.tr.y < org.x - org.y + sb.da && box.tr.x - box.bl.y > org.x - org.y + sb.di
+ && box.width() > 0 && box.height() > 0)
+ {
+ float di = org.x - org.y + sb.di;
+ float da = org.x - org.y + sb.da;
+ float smax = sdm(di, da, box.tr.x, box.tr.y, std::greater<float>());
+ float smin = sdm(da, di, box.bl.x, box.bl.y, std::less<float>());
+ c = 0.5f * (sb.si + sb.sa);
+ _ranges[axis].exclude(smin - c, smax - c);
+ }
+ break;
+ case 3 :
+ if (box.bl.x + box.bl.y < org.x + org.y + sb.sa && box.tr.x + box.tr.y > org.x + org.y + sb.si
+ && box.width() > 0 && box.height() > 0)
+ {
+ float si = org.x + org.y + sb.si;
+ float sa = org.x + org.y + sb.sa;
+ float dmax = sdm(si, sa, box.tr.x, -box.bl.y, std::greater<float>());
+ float dmin = sdm(sa, si, box.bl.x, -box.tr.y, std::less<float>());
+ c = 0.5f * (sb.di + sb.da);
+ _ranges[axis].exclude(dmin - c, dmax - c);
+ }
+ break;
+ default :
+ break;
+ }
+ return;
+}
+
+// Adjust the movement limits for the target to avoid having it collide
+// with the given neighbor slot. Also determine if there is in fact a collision
+// between the target and the given slot.
+bool ShiftCollider::mergeSlot(Segment *seg, Slot *slot, const SlotCollision *cslot, const Position &currShift,
+ bool isAfter, // slot is logically after _target
+ bool sameCluster, bool &hasCol, bool isExclusion,
+ GR_MAYBE_UNUSED json * const dbgout )
+{
+ bool isCol = false;
+ const float sx = slot->origin().x - _origin.x + currShift.x;
+ const float sy = slot->origin().y - _origin.y + currShift.y;
+ const float sd = sx - sy;
+ const float ss = sx + sy;
+ float vmin, vmax;
+ float omin, omax, otmin, otmax;
+ float cmin, cmax; // target limits
+ float torg;
+ const GlyphCache &gc = seg->getFace()->glyphs();
+ const unsigned short gid = slot->gid();
+ if (!gc.check(gid))
+ return false;
+ const BBox &bb = gc.getBoundingBBox(gid);
+
+ // SlotCollision * cslot = seg->collisionInfo(slot);
+ int orderFlags = 0;
+ bool sameClass = _seqProxClass == 0 && cslot->seqClass() == _seqClass;
+ if (sameCluster && _seqClass
+ && (sameClass || (_seqProxClass != 0 && cslot->seqClass() == _seqProxClass)))
+ // Force the target glyph to be in the specified direction from the slot we're testing.
+ orderFlags = _seqOrder;
+
+ // short circuit if only interested in direct collision and we are out of range
+ if (orderFlags || (sx + bb.xa + _margin >= _limit.bl.x && sx + bb.xi - _margin <= _limit.tr.x)
+ || (sy + bb.ya + _margin >= _limit.bl.y && sy + bb.yi - _margin <= _limit.tr.y))
+
+ {
+ const float tx = _currOffset.x + _currShift.x;
+ const float ty = _currOffset.y + _currShift.y;
+ const float td = tx - ty;
+ const float ts = tx + ty;
+ const SlantBox &sb = gc.getBoundingSlantBox(gid);
+ const unsigned short tgid = _target->gid();
+ const BBox &tbb = gc.getBoundingBBox(tgid);
+ const SlantBox &tsb = gc.getBoundingSlantBox(tgid);
+ float seq_above_wt = cslot->seqAboveWt();
+ float seq_below_wt = cslot->seqBelowWt();
+ float seq_valign_wt = cslot->seqValignWt();
+ float lmargin = _margin;
+ // if isAfter, invert orderFlags for diagonal orders.
+ if (isAfter)
+ {
+ // invert appropriate bits
+ orderFlags ^= (sameClass ? 0x3F : 0x3);
+ // consider 2 bits at a time, non overlapping. If both bits set, clear them
+ orderFlags = orderFlags ^ ((((orderFlags >> 1) & orderFlags) & 0x15) * 3);
+ }
+
+#if !defined GRAPHITE2_NTRACING
+ if (dbgout)
+ dbgout->setenv(0, slot);
+#endif
+
+ // Process main bounding octabox.
+ for (int i = 0; i < 4; ++i)
+ {
+ switch (i) {
+ case 0 : // x direction
+ vmin = max(max(bb.xi - tbb.xa + sx, sb.di - tsb.da + ty + sd), sb.si - tsb.sa - ty + ss);
+ vmax = min(min(bb.xa - tbb.xi + sx, sb.da - tsb.di + ty + sd), sb.sa - tsb.si - ty + ss);
+ otmin = tbb.yi + ty;
+ otmax = tbb.ya + ty;
+ omin = bb.yi + sy;
+ omax = bb.ya + sy;
+ torg = _currOffset.x;
+ cmin = _limit.bl.x + torg;
+ cmax = _limit.tr.x - tbb.xi + tbb.xa + torg;
+ lmargin = _margin;
+ break;
+ case 1 : // y direction
+ vmin = max(max(bb.yi - tbb.ya + sy, tsb.di - sb.da + tx - sd), sb.si - tsb.sa - tx + ss);
+ vmax = min(min(bb.ya - tbb.yi + sy, tsb.da - sb.di + tx - sd), sb.sa - tsb.si - tx + ss);
+ otmin = tbb.xi + tx;
+ otmax = tbb.xa + tx;
+ omin = bb.xi + sx;
+ omax = bb.xa + sx;
+ torg = _currOffset.y;
+ cmin = _limit.bl.y + torg;
+ cmax = _limit.tr.y - tbb.yi + tbb.ya + torg;
+ lmargin = _margin;
+ break;
+ case 2 : // sum - moving along the positively-sloped vector, so the boundaries are the
+ // negatively-sloped boundaries.
+ vmin = max(max(sb.si - tsb.sa + ss, 2 * (bb.yi - tbb.ya + sy) + td), 2 * (bb.xi - tbb.xa + sx) - td);
+ vmax = min(min(sb.sa - tsb.si + ss, 2 * (bb.ya - tbb.yi + sy) + td), 2 * (bb.xa - tbb.xi + sx) - td);
+ otmin = tsb.di + td;
+ otmax = tsb.da + td;
+ omin = sb.di + sd;
+ omax = sb.da + sd;
+ torg = _currOffset.x + _currOffset.y;
+ cmin = _limit.bl.x + _limit.bl.y + torg;
+ cmax = _limit.tr.x + _limit.tr.y - tsb.si + tsb.sa + torg;
+ lmargin = _margin / ISQRT2;
+ break;
+ case 3 : // diff - moving along the negatively-sloped vector, so the boundaries are the
+ // positively-sloped boundaries.
+ vmin = max(max(sb.di - tsb.da + sd, 2 * (bb.xi - tbb.xa + sx) - ts), -2 * (bb.ya - tbb.yi + sy) + ts);
+ vmax = min(min(sb.da - tsb.di + sd, 2 * (bb.xa - tbb.xi + sx) - ts), -2 * (bb.yi - tbb.ya + sy) + ts);
+ otmin = tsb.si + ts;
+ otmax = tsb.sa + ts;
+ omin = sb.si + ss;
+ omax = sb.sa + ss;
+ torg = _currOffset.x - _currOffset.y;
+ cmin = _limit.bl.x - _limit.tr.y + torg;
+ cmax = _limit.tr.x - _limit.bl.y - tsb.di + tsb.da + torg;
+ lmargin = _margin / ISQRT2;
+ break;
+ default :
+ continue;
+ }
+
+#if !defined GRAPHITE2_NTRACING
+ if (dbgout)
+ dbgout->setenv(1, reinterpret_cast<void *>(-1));
+#define DBGTAG(x) if (dbgout) dbgout->setenv(1, reinterpret_cast<void *>(-x));
+#else
+#define DBGTAG(x)
+#endif
+
+ if (orderFlags)
+ {
+ Position org(tx, ty);
+ float xminf = _limit.bl.x + _currOffset.x + tbb.xi;
+ float xpinf = _limit.tr.x + _currOffset.x + tbb.xa;
+ float ypinf = _limit.tr.y + _currOffset.y + tbb.ya;
+ float yminf = _limit.bl.y + _currOffset.y + tbb.yi;
+ switch (orderFlags) {
+ case SlotCollision::SEQ_ORDER_RIGHTUP :
+ {
+ float r1Xedge = cslot->seqAboveXoff() + 0.5f * (bb.xi + bb.xa) + sx;
+ float r3Xedge = cslot->seqBelowXlim() + bb.xa + sx + 0.5f * (tbb.xa - tbb.xi);
+ float r2Yedge = 0.5f * (bb.yi + bb.ya) + sy;
+
+ // DBGTAG(1x) means the regions are up and right
+ // region 1
+ DBGTAG(11)
+ addBox_slope(true, Rect(Position(xminf, r2Yedge), Position(r1Xedge, ypinf)),
+ tbb, tsb, org, 0, seq_above_wt, true, i);
+ // region 2
+ DBGTAG(12)
+ removeBox(Rect(Position(xminf, yminf), Position(r3Xedge, r2Yedge)), tbb, tsb, org, i);
+ // region 3, which end is zero is irrelevant since m weight is 0
+ DBGTAG(13)
+ addBox_slope(true, Rect(Position(r3Xedge, yminf), Position(xpinf, r2Yedge - cslot->seqValignHt())),
+ tbb, tsb, org, seq_below_wt, 0, true, i);
+ // region 4
+ DBGTAG(14)
+ addBox_slope(false, Rect(Position(sx + bb.xi, r2Yedge), Position(xpinf, r2Yedge + cslot->seqValignHt())),
+ tbb, tsb, org, 0, seq_valign_wt, true, i);
+ // region 5
+ DBGTAG(15)
+ addBox_slope(false, Rect(Position(sx + bb.xi, r2Yedge - cslot->seqValignHt()), Position(xpinf, r2Yedge)),
+ tbb, tsb, org, seq_below_wt, seq_valign_wt, false, i);
+ break;
+ }
+ case SlotCollision::SEQ_ORDER_LEFTDOWN :
+ {
+ float r1Xedge = 0.5f * (bb.xi + bb.xa) + cslot->seqAboveXoff() + sx;
+ float r3Xedge = bb.xi - cslot->seqBelowXlim() + sx - 0.5f * (tbb.xa - tbb.xi);
+ float r2Yedge = 0.5f * (bb.yi + bb.ya) + sy;
+ // DBGTAG(2x) means the regions are up and right
+ // region 1
+ DBGTAG(21)
+ addBox_slope(true, Rect(Position(r1Xedge, yminf), Position(xpinf, r2Yedge)),
+ tbb, tsb, org, 0, seq_above_wt, false, i);
+ // region 2
+ DBGTAG(22)
+ removeBox(Rect(Position(r3Xedge, r2Yedge), Position(xpinf, ypinf)), tbb, tsb, org, i);
+ // region 3
+ DBGTAG(23)
+ addBox_slope(true, Rect(Position(xminf, r2Yedge - cslot->seqValignHt()), Position(r3Xedge, ypinf)),
+ tbb, tsb, org, seq_below_wt, 0, false, i);
+ // region 4
+ DBGTAG(24)
+ addBox_slope(false, Rect(Position(xminf, r2Yedge), Position(sx + bb.xa, r2Yedge + cslot->seqValignHt())),
+ tbb, tsb, org, 0, seq_valign_wt, true, i);
+ // region 5
+ DBGTAG(25)
+ addBox_slope(false, Rect(Position(xminf, r2Yedge - cslot->seqValignHt()),
+ Position(sx + bb.xa, r2Yedge)), tbb, tsb, org, seq_below_wt, seq_valign_wt, false, i);
+ break;
+ }
+ case SlotCollision::SEQ_ORDER_NOABOVE : // enforce neighboring glyph being above
+ DBGTAG(31);
+ removeBox(Rect(Position(bb.xi - tbb.xa + sx, sy + bb.ya),
+ Position(bb.xa - tbb.xi + sx, ypinf)), tbb, tsb, org, i);
+ break;
+ case SlotCollision::SEQ_ORDER_NOBELOW : // enforce neighboring glyph being below
+ DBGTAG(32);
+ removeBox(Rect(Position(bb.xi - tbb.xa + sx, yminf),
+ Position(bb.xa - tbb.xi + sx, sy + bb.yi)), tbb, tsb, org, i);
+ break;
+ case SlotCollision::SEQ_ORDER_NOLEFT : // enforce neighboring glyph being to the left
+ DBGTAG(33)
+ removeBox(Rect(Position(xminf, bb.yi - tbb.ya + sy),
+ Position(bb.xi - tbb.xa + sx, bb.ya - tbb.yi + sy)), tbb, tsb, org, i);
+ break;
+ case SlotCollision::SEQ_ORDER_NORIGHT : // enforce neighboring glyph being to the right
+ DBGTAG(34)
+ removeBox(Rect(Position(bb.xa - tbb.xi + sx, bb.yi - tbb.ya + sy),
+ Position(xpinf, bb.ya - tbb.yi + sy)), tbb, tsb, org, i);
+ break;
+ default :
+ break;
+ }
+ }
+
+ if (vmax < cmin - lmargin || vmin > cmax + lmargin || omax < otmin - lmargin || omin > otmax + lmargin)
+ continue;
+
+ // Process sub-boxes that are defined for this glyph.
+ // We only need to do this if there was in fact a collision with the main octabox.
+ uint8 numsub = gc.numSubBounds(gid);
+ if (numsub > 0)
+ {
+ bool anyhits = false;
+ for (int j = 0; j < numsub; ++j)
+ {
+ const BBox &sbb = gc.getSubBoundingBBox(gid, j);
+ const SlantBox &ssb = gc.getSubBoundingSlantBox(gid, j);
+ switch (i) {
+ case 0 : // x
+ vmin = max(max(sbb.xi-tbb.xa+sx, ssb.di-tsb.da+sd+ty), ssb.si-tsb.sa+ss-ty);
+ vmax = min(min(sbb.xa-tbb.xi+sx, ssb.da-tsb.di+sd+ty), ssb.sa-tsb.si+ss-ty);
+ omin = sbb.yi + sy;
+ omax = sbb.ya + sy;
+ break;
+ case 1 : // y
+ vmin = max(max(sbb.yi-tbb.ya+sy, tsb.di-ssb.da-sd+tx), ssb.si-tsb.sa+ss-tx);
+ vmax = min(min(sbb.ya-tbb.yi+sy, tsb.da-ssb.di-sd+tx), ssb.sa-tsb.si+ss-tx);
+ omin = sbb.xi + sx;
+ omax = sbb.xa + sx;
+ break;
+ case 2 : // sum
+ vmin = max(max(ssb.si-tsb.sa+ss, 2*(sbb.yi-tbb.ya+sy)+td), 2*(sbb.xi-tbb.xa+sx)-td);
+ vmax = min(min(ssb.sa-tsb.si+ss, 2*(sbb.ya-tbb.yi+sy)+td), 2*(sbb.xa-tbb.xi+sx)-td);
+ omin = ssb.di + sd;
+ omax = ssb.da + sd;
+ break;
+ case 3 : // diff
+ vmin = max(max(ssb.di-tsb.da+sd, 2*(sbb.xi-tbb.xa+sx)-ts), -2*(sbb.ya-tbb.yi+sy)+ts);
+ vmax = min(min(ssb.da-tsb.di+sd, 2*(sbb.xa-tbb.xi+sx)-ts), -2*(sbb.yi-tbb.ya+sy)+ts);
+ omin = ssb.si + ss;
+ omax = ssb.sa + ss;
+ break;
+ }
+ if (vmax < cmin - lmargin || vmin > cmax + lmargin || omax < otmin - lmargin || omin > otmax + lmargin)
+ continue;
+
+#if !defined GRAPHITE2_NTRACING
+ if (dbgout)
+ dbgout->setenv(1, reinterpret_cast<void *>(j));
+#endif
+ if (omin > otmax)
+ _ranges[i].weightedAxis(i, vmin - lmargin, vmax + lmargin, 0, 0, 0, 0, 0,
+ sqr(lmargin - omin + otmax) * _marginWt, false);
+ else if (omax < otmin)
+ _ranges[i].weightedAxis(i, vmin - lmargin, vmax + lmargin, 0, 0, 0, 0, 0,
+ sqr(lmargin - otmin + omax) * _marginWt, false);
+ else
+ _ranges[i].exclude_with_margins(vmin, vmax, i);
+ anyhits = true;
+ }
+ if (anyhits)
+ isCol = true;
+ }
+ else // no sub-boxes
+ {
+#if !defined GRAPHITE2_NTRACING
+ if (dbgout)
+ dbgout->setenv(1, reinterpret_cast<void *>(-1));
+#endif
+ isCol = true;
+ if (omin > otmax)
+ _ranges[i].weightedAxis(i, vmin - lmargin, vmax + lmargin, 0, 0, 0, 0, 0,
+ sqr(lmargin - omin + otmax) * _marginWt, false);
+ else if (omax < otmin)
+ _ranges[i].weightedAxis(i, vmin - lmargin, vmax + lmargin, 0, 0, 0, 0, 0,
+ sqr(lmargin - otmin + omax) * _marginWt, false);
+ else
+ _ranges[i].exclude_with_margins(vmin, vmax, i);
+
+ }
+ }
+ }
+ bool res = true;
+ if (cslot->exclGlyph() > 0 && gc.check(cslot->exclGlyph()) && !isExclusion)
+ {
+ // Set up the bogus slot representing the exclusion glyph.
+ Slot *exclSlot = seg->newSlot();
+ exclSlot->setGlyph(seg, cslot->exclGlyph());
+ Position exclOrigin(slot->origin() + cslot->exclOffset());
+ exclSlot->origin(exclOrigin);
+ SlotCollision exclInfo(seg, exclSlot);
+ res &= mergeSlot(seg, exclSlot, &exclInfo, currShift, isAfter, sameCluster, isCol, true, dbgout );
+ seg->freeSlot(exclSlot);
+ }
+ hasCol |= isCol;
+ return res;
+
+} // end of ShiftCollider::mergeSlot
+
+
+// Figure out where to move the target glyph to, and return the amount to shift by.
+Position ShiftCollider::resolve(GR_MAYBE_UNUSED Segment *seg, bool &isCol, GR_MAYBE_UNUSED json * const dbgout)
+{
+ float tbase;
+ float totalCost = (float)(std::numeric_limits<float>::max() / 2);
+ Position resultPos = Position(0, 0);
+#if !defined GRAPHITE2_NTRACING
+ int bestAxis = -1;
+ if (dbgout)
+ {
+ outputJsonDbgStartSlot(dbgout, seg);
+ *dbgout << "vectors" << json::array;
+ }
+#endif
+ isCol = true;
+ for (int i = 0; i < 4; ++i)
+ {
+ float bestCost = -1;
+ float bestPos;
+ // Calculate the margin depending on whether we are moving diagonally or not:
+ switch (i) {
+ case 0 : // x direction
+ tbase = _currOffset.x;
+ break;
+ case 1 : // y direction
+ tbase = _currOffset.y;
+ break;
+ case 2 : // sum (negatively-sloped diagonals)
+ tbase = _currOffset.x + _currOffset.y;
+ break;
+ case 3 : // diff (positively-sloped diagonals)
+ tbase = _currOffset.x - _currOffset.y;
+ break;
+ }
+ Position testp;
+ bestPos = _ranges[i].closest(0, bestCost) - tbase; // Get the best relative position
+#if !defined GRAPHITE2_NTRACING
+ if (dbgout)
+ outputJsonDbgOneVector(dbgout, seg, i, tbase, bestCost, bestPos) ;
+#endif
+ if (bestCost >= 0.0f)
+ {
+ isCol = false;
+ switch (i) {
+ case 0 : testp = Position(bestPos, _currShift.y); break;
+ case 1 : testp = Position(_currShift.x, bestPos); break;
+ case 2 : testp = Position(0.5f * (_currShift.x - _currShift.y + bestPos), 0.5f * (_currShift.y - _currShift.x + bestPos)); break;
+ case 3 : testp = Position(0.5f * (_currShift.x + _currShift.y + bestPos), 0.5f * (_currShift.x + _currShift.y - bestPos)); break;
+ }
+ if (bestCost < totalCost - 0.01f)
+ {
+ totalCost = bestCost;
+ resultPos = testp;
+#if !defined GRAPHITE2_NTRACING
+ bestAxis = i;
+#endif
+ }
+ }
+ } // end of loop over 4 directions
+
+#if !defined GRAPHITE2_NTRACING
+ if (dbgout)
+ outputJsonDbgEndSlot(dbgout, resultPos, bestAxis, isCol);
+#endif
+
+ return resultPos;
+
+} // end of ShiftCollider::resolve
+
+
+#if !defined GRAPHITE2_NTRACING
+
+void ShiftCollider::outputJsonDbg(json * const dbgout, Segment *seg, int axis)
+{
+ int axisMax = axis;
+ if (axis < 0) // output all axes
+ {
+ *dbgout << "gid" << _target->gid()
+ << "limit" << _limit
+ << "target" << json::object
+ << "origin" << _target->origin()
+ << "margin" << _margin
+ << "bbox" << seg->theGlyphBBoxTemporary(_target->gid())
+ << "slantbox" << seg->getFace()->glyphs().slant(_target->gid())
+ << json::close; // target object
+ *dbgout << "ranges" << json::array;
+ axis = 0;
+ axisMax = 3;
+ }
+ for (int iAxis = axis; iAxis <= axisMax; ++iAxis)
+ {
+ *dbgout << json::flat << json::array << _ranges[iAxis].position();
+ for (Zones::const_iterator s = _ranges[iAxis].begin(), e = _ranges[iAxis].end(); s != e; ++s)
+ *dbgout << json::flat << json::array
+ << Position(s->x, s->xm) << s->sm << s->smx << s->c
+ << json::close;
+ *dbgout << json::close;
+ }
+ if (axis < axisMax) // looped through the _ranges array for all axes
+ *dbgout << json::close; // ranges array
+}
+
+void ShiftCollider::outputJsonDbgStartSlot(json * const dbgout, Segment *seg)
+{
+ *dbgout << json::object // slot - not closed till the end of the caller method
+ << "slot" << objectid(dslot(seg, _target))
+ << "gid" << _target->gid()
+ << "limit" << _limit
+ << "target" << json::object
+ << "origin" << _origin
+ << "currShift" << _currShift
+ << "currOffset" << seg->collisionInfo(_target)->offset()
+ << "bbox" << seg->theGlyphBBoxTemporary(_target->gid())
+ << "slantBox" << seg->getFace()->glyphs().slant(_target->gid())
+ << "fix" << "shift";
+ *dbgout << json::close; // target object
+}
+
+void ShiftCollider::outputJsonDbgEndSlot(GR_MAYBE_UNUSED json * const dbgout,
+ Position resultPos, int bestAxis, bool isCol)
+{
+ *dbgout << json::close // vectors array
+ << "result" << resultPos
+ //<< "scraping" << _scraping[bestAxis]
+ << "bestAxis" << bestAxis
+ << "stillBad" << isCol
+ << json::close; // slot object
+}
+
+void ShiftCollider::outputJsonDbgOneVector(json * const dbgout, Segment *seg, int axis,
+ float tleft, float bestCost, float bestVal)
+{
+ const char * label;
+ switch (axis)
+ {
+ case 0: label = "x"; break;
+ case 1: label = "y"; break;
+ case 2: label = "sum (NE-SW)"; break;
+ case 3: label = "diff (NW-SE)"; break;
+ default: label = "???"; break;
+ }
+
+ *dbgout << json::object // vector
+ << "direction" << label
+ << "targetMin" << tleft;
+
+ outputJsonDbgRemovals(dbgout, axis, seg);
+
+ *dbgout << "ranges";
+ outputJsonDbg(dbgout, seg, axis);
+
+ *dbgout << "bestCost" << bestCost
+ << "bestVal" << bestVal + tleft
+ << json::close; // vectors object
+}
+
+void ShiftCollider::outputJsonDbgRemovals(json * const dbgout, int axis, Segment *seg)
+{
+ *dbgout << "removals" << json::array;
+ _ranges[axis].jsonDbgOut(seg);
+ *dbgout << json::close; // removals array
+}
+
+#endif // !defined GRAPHITE2_NTRACING
+
+
+//// KERN-COLLIDER ////
+
+inline
+static float localmax (float al, float au, float bl, float bu, float x)
+{
+ if (al < bl)
+ { if (au < bu) return au < x ? au : x; }
+ else if (au > bu) return bl < x ? bl : x;
+ return x;
+}
+
+inline
+static float localmin(float al, float au, float bl, float bu, float x)
+{
+ if (bl > al)
+ { if (bu > au) return bl > x ? bl : x; }
+ else if (au > bu) return al > x ? al : x;
+ return x;
+}
+
+// Return the given edge of the glyph at height y, taking any slant box into account.
+static float get_edge(Segment *seg, const Slot *s, const Position &shift, float y, float width, float margin, bool isRight)
+{
+ const GlyphCache &gc = seg->getFace()->glyphs();
+ unsigned short gid = s->gid();
+ float sx = s->origin().x + shift.x;
+ float sy = s->origin().y + shift.y;
+ uint8 numsub = gc.numSubBounds(gid);
+ float res = isRight ? (float)-1e38 : (float)1e38;
+
+ if (numsub > 0)
+ {
+ for (int i = 0; i < numsub; ++i)
+ {
+ const BBox &sbb = gc.getSubBoundingBBox(gid, i);
+ const SlantBox &ssb = gc.getSubBoundingSlantBox(gid, i);
+ if (sy + sbb.yi - margin > y + width / 2 || sy + sbb.ya + margin < y - width / 2)
+ continue;
+ if (isRight)
+ {
+ float x = sx + sbb.xa + margin;
+ if (x > res)
+ {
+ float td = sx - sy + ssb.da + margin + y;
+ float ts = sx + sy + ssb.sa + margin - y;
+ x = localmax(td - width / 2, td + width / 2, ts - width / 2, ts + width / 2, x);
+ if (x > res)
+ res = x;
+ }
+ }
+ else
+ {
+ float x = sx + sbb.xi - margin;
+ if (x < res)
+ {
+ float td = sx - sy + ssb.di - margin + y;
+ float ts = sx + sy + ssb.si - margin - y;
+ x = localmin(td - width / 2, td + width / 2, ts - width / 2, ts + width / 2, x);
+ if (x < res)
+ res = x;
+ }
+ }
+ }
+ }
+ else
+ {
+ const BBox &bb = gc.getBoundingBBox(gid);
+ const SlantBox &sb = gc.getBoundingSlantBox(gid);
+ float td = sx - sy + y;
+ float ts = sx + sy - y;
+ if (isRight)
+ res = localmax(td + sb.da - width / 2, td + sb.da + width / 2, ts + sb.sa - width / 2, ts + sb.sa + width / 2, sx + bb.xa) + margin;
+ else
+ res = localmin(td + sb.di - width / 2, td + sb.di + width / 2, ts + sb.si - width / 2, ts + sb.si + width / 2, sx + bb.xi) - margin;
+ }
+ return res;
+}
+
+
+bool KernCollider::initSlot(Segment *seg, Slot *aSlot, const Rect &limit, float margin,
+ const Position &currShift, const Position &offsetPrev, int dir,
+ float ymin, float ymax, GR_MAYBE_UNUSED json * const dbgout)
+{
+ const GlyphCache &gc = seg->getFace()->glyphs();
+ const Slot *base = aSlot;
+ // const Slot *last = aSlot;
+ const Slot *s;
+ int numSlices;
+ while (base->attachedTo())
+ base = base->attachedTo();
+ if (margin < 10) margin = 10;
+
+ _limit = limit;
+ _offsetPrev = offsetPrev; // kern from a previous pass
+
+ // Calculate the height of the glyph and how many horizontal slices to use.
+ if (_maxy >= 1e37f)
+ {
+ _sliceWidth = margin / 1.5f;
+ _maxy = ymax + margin;
+ _miny = ymin - margin;
+ numSlices = int((_maxy - _miny + 2) / (_sliceWidth / 1.5f) + 1.f); // +2 helps with rounding errors
+ _edges.clear();
+ _edges.insert(_edges.begin(), numSlices, (dir & 1) ? 1e38f : -1e38f);
+ _xbound = (dir & 1) ? (float)1e38f : (float)-1e38f;
+ }
+ else if (_maxy != ymax || _miny != ymin)
+ {
+ if (_miny != ymin)
+ {
+ numSlices = int((ymin - margin - _miny) / _sliceWidth - 1);
+ _miny += numSlices * _sliceWidth;
+ if (numSlices < 0)
+ _edges.insert(_edges.begin(), -numSlices, (dir & 1) ? 1e38f : -1e38f);
+ else if ((unsigned)numSlices < _edges.size()) // this shouldn't fire since we always grow the range
+ {
+ Vector<float>::iterator e = _edges.begin();
+ while (numSlices--)
+ ++e;
+ _edges.erase(_edges.begin(), e);
+ }
+ }
+ if (_maxy != ymax)
+ {
+ numSlices = int((ymax + margin - _miny) / _sliceWidth + 1);
+ _maxy = numSlices * _sliceWidth + _miny;
+ if (numSlices > (int)_edges.size())
+ _edges.insert(_edges.end(), numSlices - _edges.size(), (dir & 1) ? 1e38f : -1e38f);
+ else if (numSlices < (int)_edges.size()) // this shouldn't fire since we always grow the range
+ {
+ while ((int)_edges.size() > numSlices)
+ _edges.pop_back();
+ }
+ }
+ goto done;
+ }
+ numSlices = _edges.size();
+
+#if !defined GRAPHITE2_NTRACING
+ // Debugging
+ _seg = seg;
+ _slotNear.clear();
+ _slotNear.insert(_slotNear.begin(), numSlices, NULL);
+ _nearEdges.clear();
+ _nearEdges.insert(_nearEdges.begin(), numSlices, (dir & 1) ? -1e38f : +1e38f);
+#endif
+
+ // Determine the trailing edge of each slice (ie, left edge for a RTL glyph).
+ for (s = base; s; s = s->nextInCluster(s))
+ {
+ SlotCollision *c = seg->collisionInfo(s);
+ if (!gc.check(s->gid()))
+ return false;
+ const BBox &bs = gc.getBoundingBBox(s->gid());
+ float x = s->origin().x + c->shift().x + ((dir & 1) ? bs.xi : bs.xa);
+ // Loop over slices.
+ // Note smin might not be zero if glyph s is not at the bottom of the cluster; similarly for smax.
+ float toffset = c->shift().y - _miny + 1 + s->origin().y;
+ int smin = max(0, int((bs.yi + toffset) / _sliceWidth));
+ int smax = min(numSlices - 1, int((bs.ya + toffset) / _sliceWidth + 1));
+ for (int i = smin; i <= smax; ++i)
+ {
+ float t;
+ float y = _miny - 1 + (i + .5f) * _sliceWidth; // vertical center of slice
+ if ((dir & 1) && x < _edges[i])
+ {
+ t = get_edge(seg, s, c->shift(), y, _sliceWidth, margin, false);
+ if (t < _edges[i])
+ {
+ _edges[i] = t;
+ if (t < _xbound)
+ _xbound = t;
+ }
+ }
+ else if (!(dir & 1) && x > _edges[i])
+ {
+ t = get_edge(seg, s, c->shift(), y, _sliceWidth, margin, true);
+ if (t > _edges[i])
+ {
+ _edges[i] = t;
+ if (t > _xbound)
+ _xbound = t;
+ }
+ }
+ }
+ }
+ done:
+ _mingap = (float)1e38;
+ _target = aSlot;
+ _margin = margin;
+ _currShift = currShift;
+ return true;
+} // end of KernCollider::initSlot
+
+
+// Determine how much the target slot needs to kern away from the given slot.
+// In other words, merge information from given slot's position with what the target slot knows
+// about how it can kern.
+// Return false if we know there is no collision, true if we think there might be one.
+bool KernCollider::mergeSlot(Segment *seg, Slot *slot, const Position &currShift, float currSpace, int dir, GR_MAYBE_UNUSED json * const dbgout)
+{
+ int rtl = (dir & 1) * 2 - 1;
+ if (!seg->getFace()->glyphs().check(slot->gid()))
+ return false;
+ const Rect &bb = seg->theGlyphBBoxTemporary(slot->gid());
+ const float sx = slot->origin().x + currShift.x;
+ float x = (sx + (rtl > 0 ? bb.tr.x : bb.bl.x)) * rtl;
+ // this isn't going to reduce _mingap so skip
+ if (x < rtl * (_xbound - _mingap - currSpace))
+ return false;
+
+ const float sy = slot->origin().y + currShift.y;
+ int smin = max(1, int((bb.bl.y + (1 - _miny + sy)) / _sliceWidth + 1)) - 1;
+ int smax = min((int)_edges.size() - 2, int((bb.tr.y + (1 - _miny + sy)) / _sliceWidth + 1)) + 1;
+ if (smin > smax)
+ return false;
+ bool collides = false;
+
+ for (int i = smin; i <= smax; ++i)
+ {
+ float t;
+ float here = _edges[i] * rtl;
+ float y = (float)(_miny - 1 + (i + .5f) * _sliceWidth); // vertical center of slice
+ if ( (x > here - _mingap - currSpace) )
+ {
+ // 2 * currSpace to account for the space that is already separating them and the space we want to add
+ float m = get_edge(seg, slot, currShift, y, _sliceWidth, 0., rtl > 0) * rtl + 2 * currSpace;
+ t = here - m;
+ // _mingap is positive to shrink
+ if (t < _mingap)
+ {
+ _mingap = t;
+ collides = true;
+ }
+#if !defined GRAPHITE2_NTRACING
+ // Debugging - remember the closest neighboring edge for this slice.
+ if (m > rtl * _nearEdges[i])
+ {
+ _slotNear[i] = slot;
+ _nearEdges[i] = m * rtl;
+ }
+#endif
+ }
+ }
+ return collides; // note that true is not a necessarily reliable value
+
+} // end of KernCollider::mergeSlot
+
+
+// Return the amount to kern by.
+Position KernCollider::resolve(GR_MAYBE_UNUSED Segment *seg, GR_MAYBE_UNUSED Slot *slot,
+ int dir, GR_MAYBE_UNUSED json * const dbgout)
+{
+ float resultNeeded = (1 - 2 * (dir & 1)) * _mingap;
+ // float resultNeeded = (1 - 2 * (dir & 1)) * (_mingap - margin);
+ float result = min(_limit.tr.x - _offsetPrev.x, max(resultNeeded, _limit.bl.x - _offsetPrev.x));
+
+#if !defined GRAPHITE2_NTRACING
+ if (dbgout)
+ {
+ *dbgout << json::object // slot
+ << "slot" << objectid(dslot(seg, _target))
+ << "gid" << _target->gid()
+ << "limit" << _limit
+ << "miny" << _miny
+ << "maxy" << _maxy
+ << "slicewidth" << _sliceWidth
+ << "target" << json::object
+ << "origin" << _target->origin()
+ //<< "currShift" << _currShift
+ << "offsetPrev" << _offsetPrev
+ << "bbox" << seg->theGlyphBBoxTemporary(_target->gid())
+ << "slantBox" << seg->getFace()->glyphs().slant(_target->gid())
+ << "fix" << "kern"
+ << json::close; // target object
+
+ *dbgout << "slices" << json::array;
+ for (int is = 0; is < (int)_edges.size(); is++)
+ {
+ *dbgout << json::flat << json::object
+ << "i" << is
+ << "targetEdge" << _edges[is]
+ << "neighbor" << objectid(dslot(seg, _slotNear[is]))
+ << "nearEdge" << _nearEdges[is]
+ << json::close;
+ }
+ *dbgout << json::close; // slices array
+
+ *dbgout
+ << "xbound" << _xbound
+ << "minGap" << _mingap
+ << "needed" << resultNeeded
+ << "result" << result
+ << "stillBad" << (result != resultNeeded)
+ << json::close; // slot object
+ }
+#endif
+
+ return Position(result, 0.);
+
+} // end of KernCollider::resolve
+
+void KernCollider::shift(const Position &mv, int dir)
+{
+ for (Vector<float>::iterator e = _edges.begin(); e != _edges.end(); ++e)
+ *e += mv.x;
+ _xbound += (1 - 2 * (dir & 1)) * mv.x;
+}
+
+//// SLOT-COLLISION ////
+
+// Initialize the collision attributes for the given slot.
+SlotCollision::SlotCollision(Segment *seg, Slot *slot)
+{
+ initFromSlot(seg, slot);
+}
+
+void SlotCollision::initFromSlot(Segment *seg, Slot *slot)
+{
+ // Initialize slot attributes from glyph attributes.
+ // The order here must match the order in the grcompiler code,
+ // GrcSymbolTable::AssignInternalGlyphAttrIDs.
+ uint16 gid = slot->gid();
+ uint16 aCol = seg->silf()->aCollision(); // flags attr ID
+ const GlyphFace * glyphFace = seg->getFace()->glyphs().glyphSafe(gid);
+ if (!glyphFace)
+ return;
+ const sparse &p = glyphFace->attrs();
+ _flags = p[aCol];
+ _limit = Rect(Position(p[aCol+1], p[aCol+2]),
+ Position(p[aCol+3], p[aCol+4]));
+ _margin = p[aCol+5];
+ _marginWt = p[aCol+6];
+
+ _seqClass = p[aCol+7];
+ _seqProxClass = p[aCol+8];
+ _seqOrder = p[aCol+9];
+ _seqAboveXoff = p[aCol+10];
+ _seqAboveWt = p[aCol+11];
+ _seqBelowXlim = p[aCol+12];
+ _seqBelowWt = p[aCol+13];
+ _seqValignHt = p[aCol+14];
+ _seqValignWt = p[aCol+15];
+
+ // These attributes do not have corresponding glyph attribute:
+ _exclGlyph = 0;
+ _exclOffset = Position(0, 0);
+}
+
+float SlotCollision::getKern(int dir) const
+{
+ if ((_flags & SlotCollision::COLL_KERN) != 0)
+ return float(_shift.x * ((dir & 1) ? -1 : 1));
+ else
+ return 0;
+}
+
+bool SlotCollision::ignore() const
+{
+ return ((flags() & SlotCollision::COLL_IGNORE) || (flags() & SlotCollision::COLL_ISSPACE));
+}