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Diffstat (limited to 'gfx/graphite2/src/Collider.cpp')
| -rw-r--r-- | gfx/graphite2/src/Collider.cpp | 1115 |
1 files changed, 1115 insertions, 0 deletions
diff --git a/gfx/graphite2/src/Collider.cpp b/gfx/graphite2/src/Collider.cpp new file mode 100644 index 0000000000..1929b39a58 --- /dev/null +++ b/gfx/graphite2/src/Collider.cpp @@ -0,0 +1,1115 @@ +/* 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; + // 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(); + if (!exclSlot) + return res; + 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); + if (sy + bb.yi - margin > y + width / 2 || sy + bb.ya + margin < y - width / 2) + return res; + 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 = int(_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)1e37; // less than 1e38 s.t. 1e38-_mingap is really big + _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 (_hit && 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; + bool nooverlap = true; + + for (int i = smin; i <= smax; ++i) + { + float here = _edges[i] * rtl; + if (here > (float)9e37) + continue; + if (!_hit || x > here - _mingap - currSpace) + { + float y = (float)(_miny - 1 + (i + .5f) * _sliceWidth); // vertical center of slice + // 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; + if (m < (float)-8e37) // only true if the glyph has a gap in it + continue; + nooverlap = false; + float t = here - m; + // _mingap is positive to shrink + if (t < _mingap || (!_hit && !collides)) + { + _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 + } + else + nooverlap = false; + } + if (nooverlap) + _mingap = max(_mingap, _xbound - rtl * (currSpace + _margin + x)); + if (collides && !nooverlap) + _hit = true; + return collides | nooverlap; // 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(int16(p[aCol+1]), int16(p[aCol+2])), + Position(int16(p[aCol+3]), int16(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)); +} |