/* * Copyright (C) 2007 Trolltech ASA * * This is part of HarfBuzz, an OpenType Layout engine library. * * Permission is hereby granted, without written agreement and without * license or royalty fees, to use, copy, modify, and distribute this * software and its documentation for any purpose, provided that the * above copyright notice and the following two paragraphs appear in * all copies of this software. * * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. */ #include "harfbuzz-shaper.h" #include "harfbuzz-shaper-private.h" #include "harfbuzz-stream-private.h" #include #include #define HB_MIN(a, b) ((a) < (b) ? (a) : (b)) #define HB_MAX(a, b) ((a) > (b) ? (a) : (b)) // ----------------------------------------------------------------------------------------------------- // // The line break algorithm. See http://www.unicode.org/reports/tr14/tr14-13.html // // ----------------------------------------------------------------------------------------------------- /* The Unicode algorithm does in our opinion allow line breaks at some places they shouldn't be allowed. The following changes were thus made in comparison to the Unicode reference: EX->AL from DB to IB SY->AL from DB to IB SY->PO from DB to IB SY->PR from DB to IB SY->OP from DB to IB AL->PR from DB to IB AL->PO from DB to IB PR->PR from DB to IB PO->PO from DB to IB PR->PO from DB to IB PO->PR from DB to IB HY->PO from DB to IB HY->PR from DB to IB HY->OP from DB to IB NU->EX from PB to IB EX->PO from DB to IB */ // The following line break classes are not treated by the table: // AI, BK, CB, CR, LF, NL, SA, SG, SP, XX enum break_class { // the first 4 values have to agree with the enum in QCharAttributes ProhibitedBreak, // PB in table DirectBreak, // DB in table IndirectBreak, // IB in table CombiningIndirectBreak, // CI in table CombiningProhibitedBreak // CP in table }; #define DB DirectBreak #define IB IndirectBreak #define CI CombiningIndirectBreak #define CP CombiningProhibitedBreak #define PB ProhibitedBreak static const hb_uint8 breakTable[HB_LineBreak_JT+1][HB_LineBreak_JT+1] = { /* OP CL QU GL NS EX SY IS PR PO NU AL ID IN HY BA BB B2 ZW CM WJ H2 H3 JL JV JT */ /* OP */ { PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, CP, PB, PB, PB, PB, PB, PB }, /* CL */ { DB, PB, IB, IB, PB, PB, PB, PB, IB, IB, IB, IB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB }, /* QU */ { PB, PB, IB, IB, IB, PB, PB, PB, IB, IB, IB, IB, IB, IB, IB, IB, IB, IB, PB, CI, PB, IB, IB, IB, IB, IB }, /* GL */ { IB, PB, IB, IB, IB, PB, PB, PB, IB, IB, IB, IB, IB, IB, IB, IB, IB, IB, PB, CI, PB, IB, IB, IB, IB, IB }, /* NS */ { DB, PB, IB, IB, IB, PB, PB, PB, DB, DB, DB, DB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB }, /* EX */ { DB, PB, IB, IB, IB, PB, PB, PB, DB, IB, DB, IB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB }, /* SY */ { IB, PB, IB, IB, IB, PB, PB, PB, IB, IB, IB, IB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB }, /* IS */ { DB, PB, IB, IB, IB, PB, PB, PB, DB, DB, IB, IB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB }, /* PR */ { IB, PB, IB, IB, IB, PB, PB, PB, IB, IB, IB, IB, IB, DB, IB, IB, DB, DB, PB, CI, PB, IB, IB, IB, IB, IB }, /* PO */ { IB, PB, IB, IB, IB, PB, PB, PB, IB, IB, IB, IB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB }, /* NU */ { IB, PB, IB, IB, IB, IB, PB, PB, IB, IB, IB, IB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB }, /* AL */ { IB, PB, IB, IB, IB, PB, PB, PB, IB, IB, IB, IB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB }, /* ID */ { DB, PB, IB, IB, IB, PB, PB, PB, DB, IB, DB, DB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB }, /* IN */ { DB, PB, IB, IB, IB, PB, PB, PB, DB, DB, DB, DB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB }, /* HY */ { IB, PB, IB, IB, IB, PB, PB, PB, IB, IB, IB, DB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB }, /* BA */ { DB, PB, IB, IB, IB, PB, PB, PB, DB, DB, DB, DB, DB, DB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB }, /* BB */ { IB, PB, IB, IB, IB, PB, PB, PB, IB, IB, IB, IB, IB, IB, IB, IB, IB, IB, PB, CI, PB, IB, IB, IB, IB, IB }, /* B2 */ { DB, PB, IB, IB, IB, PB, PB, PB, DB, DB, DB, DB, DB, DB, IB, IB, DB, PB, PB, CI, PB, DB, DB, DB, DB, DB }, /* ZW */ { DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, DB, PB, DB, DB, DB, DB, DB, DB, DB }, /* CM */ { DB, PB, IB, IB, IB, PB, PB, PB, DB, DB, IB, IB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, DB }, /* WJ */ { IB, PB, IB, IB, IB, PB, PB, PB, IB, IB, IB, IB, IB, IB, IB, IB, IB, IB, PB, CI, PB, IB, IB, IB, IB, IB }, /* H2 */ { DB, PB, IB, IB, IB, PB, PB, PB, DB, IB, DB, DB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, IB, IB }, /* H3 */ { DB, PB, IB, IB, IB, PB, PB, PB, DB, IB, DB, DB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, IB }, /* JL */ { DB, PB, IB, IB, IB, PB, PB, PB, DB, IB, DB, DB, DB, IB, IB, IB, DB, DB, PB, CI, PB, IB, IB, IB, IB, DB }, /* JV */ { DB, PB, IB, IB, IB, PB, PB, PB, DB, IB, DB, DB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, IB, IB }, /* JT */ { DB, PB, IB, IB, IB, PB, PB, PB, DB, IB, DB, DB, DB, IB, IB, IB, DB, DB, PB, CI, PB, DB, DB, DB, DB, IB } }; #undef DB #undef IB #undef CI #undef CP #undef PB static const hb_uint8 graphemeTable[HB_Grapheme_LVT + 1][HB_Grapheme_LVT + 1] = { // Other, CR, LF, Control,Extend,L, V, T, LV, LVT { true , true , true , true , true , true , true , true , true , true }, // Other, { true , true , true , true , true , true , true , true , true , true }, // CR, { true , false, true , true , true , true , true , true , true , true }, // LF, { true , true , true , true , true , true , true , true , true , true }, // Control, { false, true , true , true , false, false, false, false, false, false }, // Extend, { true , true , true , true , true , false, true , true , true , true }, // L, { true , true , true , true , true , false, false, true , false, true }, // V, { true , true , true , true , true , true , false, false, false, false }, // T, { true , true , true , true , true , false, true , true , true , true }, // LV, { true , true , true , true , true , false, true , true , true , true }, // LVT }; static void calcLineBreaks(const HB_UChar16 *uc, hb_uint32 len, HB_CharAttributes *charAttributes) { if (!len) return; // ##### can this fail if the first char is a surrogate? HB_LineBreakClass cls; HB_GraphemeClass grapheme; HB_GetGraphemeAndLineBreakClass(*uc, &grapheme, &cls); // handle case where input starts with an LF if (cls == HB_LineBreak_LF) cls = HB_LineBreak_BK; charAttributes[0].whiteSpace = (cls == HB_LineBreak_SP || cls == HB_LineBreak_BK); charAttributes[0].charStop = true; int lcls = cls; for (hb_uint32 i = 1; i < len; ++i) { charAttributes[i].whiteSpace = false; charAttributes[i].charStop = true; HB_UChar32 code = uc[i]; HB_GraphemeClass ngrapheme; HB_LineBreakClass ncls; HB_GetGraphemeAndLineBreakClass(code, &ngrapheme, &ncls); // handle surrogates if (ncls == HB_LineBreak_SG) { if (HB_IsHighSurrogate(uc[i]) && i < len - 1 && HB_IsLowSurrogate(uc[i+1])) { continue; } else if (HB_IsLowSurrogate(uc[i]) && HB_IsHighSurrogate(uc[i-1])) { code = HB_SurrogateToUcs4(uc[i-1], uc[i]); HB_GetGraphemeAndLineBreakClass(code, &ngrapheme, &ncls); charAttributes[i].charStop = false; } else { ncls = HB_LineBreak_AL; } } // set white space and char stop flag if (ncls >= HB_LineBreak_SP) charAttributes[i].whiteSpace = true; charAttributes[i].charStop = graphemeTable[ngrapheme][grapheme]; HB_LineBreakType lineBreakType = HB_NoBreak; if (cls >= HB_LineBreak_LF) { lineBreakType = HB_ForcedBreak; } else if(cls == HB_LineBreak_CR) { lineBreakType = (ncls == HB_LineBreak_LF) ? HB_NoBreak : HB_ForcedBreak; } if (ncls == HB_LineBreak_SP) goto next_no_cls_update; if (ncls >= HB_LineBreak_CR) goto next; // two complex chars (thai or lao), thai_attributes might override, but here we do a best guess if (cls == HB_LineBreak_SA && ncls == HB_LineBreak_SA) { lineBreakType = HB_Break; goto next; } { int tcls = ncls; if (tcls >= HB_LineBreak_SA) tcls = HB_LineBreak_ID; if (cls >= HB_LineBreak_SA) cls = HB_LineBreak_ID; int brk = breakTable[cls][tcls]; switch (brk) { case DirectBreak: lineBreakType = HB_Break; if (uc[i-1] == 0xad) // soft hyphen lineBreakType = HB_SoftHyphen; break; case IndirectBreak: lineBreakType = (lcls == HB_LineBreak_SP) ? HB_Break : HB_NoBreak; break; case CombiningIndirectBreak: lineBreakType = HB_NoBreak; if (lcls == HB_LineBreak_SP){ if (i > 1) charAttributes[i-2].lineBreakType = HB_Break; } else { goto next_no_cls_update; } break; case CombiningProhibitedBreak: lineBreakType = HB_NoBreak; if (lcls != HB_LineBreak_SP) goto next_no_cls_update; case ProhibitedBreak: default: break; } } next: cls = ncls; next_no_cls_update: lcls = ncls; grapheme = ngrapheme; charAttributes[i-1].lineBreakType = lineBreakType; } charAttributes[len-1].lineBreakType = HB_ForcedBreak; } // -------------------------------------------------------------------------------------------------------------------------------------------- // // Basic processing // // -------------------------------------------------------------------------------------------------------------------------------------------- static inline void positionCluster(HB_ShaperItem *item, int gfrom, int glast) { int nmarks = glast - gfrom; assert(nmarks > 0); HB_Glyph *glyphs = item->glyphs; HB_GlyphAttributes *attributes = item->attributes; HB_GlyphMetrics baseMetrics; item->font->klass->getGlyphMetrics(item->font, glyphs[gfrom], &baseMetrics); if (item->item.script == HB_Script_Hebrew && (-baseMetrics.y) > baseMetrics.height) // we need to attach below the baseline, because of the hebrew iud. baseMetrics.height = -baseMetrics.y; // qDebug("---> positionCluster: cluster from %d to %d", gfrom, glast); // qDebug("baseInfo: %f/%f (%f/%f) off=%f/%f", baseInfo.x, baseInfo.y, baseInfo.width, baseInfo.height, baseInfo.xoff, baseInfo.yoff); HB_Fixed size = item->font->klass->getFontMetric(item->font, HB_FontAscent) / 10; HB_Fixed offsetBase = HB_FIXED_CONSTANT(1) + (size - HB_FIXED_CONSTANT(4)) / 4; if (size > HB_FIXED_CONSTANT(4)) offsetBase += HB_FIXED_CONSTANT(4); else offsetBase += size; //qreal offsetBase = (size - 4) / 4 + qMin(size, 4) + 1; // qDebug("offset = %f", offsetBase); bool rightToLeft = item->item.bidiLevel % 2; int i; unsigned char lastCmb = 0; HB_GlyphMetrics attachmentRect; memset(&attachmentRect, 0, sizeof(attachmentRect)); for(i = 1; i <= nmarks; i++) { HB_Glyph mark = glyphs[gfrom+i]; HB_GlyphMetrics markMetrics; item->font->klass->getGlyphMetrics(item->font, mark, &markMetrics); HB_FixedPoint p; p.x = p.y = 0; // qDebug("markInfo: %f/%f (%f/%f) off=%f/%f", markInfo.x, markInfo.y, markInfo.width, markInfo.height, markInfo.xoff, markInfo.yoff); HB_Fixed offset = offsetBase; unsigned char cmb = attributes[gfrom+i].combiningClass; // ### maybe the whole position determination should move down to heuristicSetGlyphAttributes. Would save some // bits in the glyphAttributes structure. if (cmb < 200) { // fixed position classes. We approximate by mapping to one of the others. // currently I added only the ones for arabic, hebrew, lao and thai. // for Lao and Thai marks with class 0, see below (heuristicSetGlyphAttributes) // add a bit more offset to arabic, a bit hacky if (cmb >= 27 && cmb <= 36 && offset < 3) offset +=1; // below if ((cmb >= 10 && cmb <= 18) || cmb == 20 || cmb == 22 || cmb == 29 || cmb == 32) cmb = HB_Combining_Below; // above else if (cmb == 23 || cmb == 27 || cmb == 28 || cmb == 30 || cmb == 31 || (cmb >= 33 && cmb <= 36)) cmb = HB_Combining_Above; //below-right else if (cmb == 9 || cmb == 103 || cmb == 118) cmb = HB_Combining_BelowRight; // above-right else if (cmb == 24 || cmb == 107 || cmb == 122) cmb = HB_Combining_AboveRight; else if (cmb == 25) cmb = HB_Combining_AboveLeft; // fixed: // 19 21 } // combining marks of different class don't interact. Reset the rectangle. if (cmb != lastCmb) { //qDebug("resetting rect"); attachmentRect = baseMetrics; } switch(cmb) { case HB_Combining_DoubleBelow: // ### wrong in rtl context! case HB_Combining_BelowLeft: p.y += offset; case HB_Combining_BelowLeftAttached: p.x += attachmentRect.x - markMetrics.x; p.y += (attachmentRect.y + attachmentRect.height) - markMetrics.y; break; case HB_Combining_Below: p.y += offset; case HB_Combining_BelowAttached: p.x += attachmentRect.x - markMetrics.x; p.y += (attachmentRect.y + attachmentRect.height) - markMetrics.y; p.x += (attachmentRect.width - markMetrics.width) / 2; break; case HB_Combining_BelowRight: p.y += offset; case HB_Combining_BelowRightAttached: p.x += attachmentRect.x + attachmentRect.width - markMetrics.width - markMetrics.x; p.y += attachmentRect.y + attachmentRect.height - markMetrics.y; break; case HB_Combining_Left: p.x -= offset; case HB_Combining_LeftAttached: break; case HB_Combining_Right: p.x += offset; case HB_Combining_RightAttached: break; case HB_Combining_DoubleAbove: // ### wrong in RTL context! case HB_Combining_AboveLeft: p.y -= offset; case HB_Combining_AboveLeftAttached: p.x += attachmentRect.x - markMetrics.x; p.y += attachmentRect.y - markMetrics.y - markMetrics.height; break; case HB_Combining_Above: p.y -= offset; case HB_Combining_AboveAttached: p.x += attachmentRect.x - markMetrics.x; p.y += attachmentRect.y - markMetrics.y - markMetrics.height; p.x += (attachmentRect.width - markMetrics.width) / 2; break; case HB_Combining_AboveRight: p.y -= offset; case HB_Combining_AboveRightAttached: p.x += attachmentRect.x + attachmentRect.width - markMetrics.x - markMetrics.width; p.y += attachmentRect.y - markMetrics.y - markMetrics.height; break; case HB_Combining_IotaSubscript: default: break; } // qDebug("char=%x combiningClass = %d offset=%f/%f", mark, cmb, p.x(), p.y()); markMetrics.x += p.x; markMetrics.y += p.y; HB_GlyphMetrics unitedAttachmentRect = attachmentRect; unitedAttachmentRect.x = HB_MIN(attachmentRect.x, markMetrics.x); unitedAttachmentRect.y = HB_MIN(attachmentRect.y, markMetrics.y); unitedAttachmentRect.width = HB_MAX(attachmentRect.x + attachmentRect.width, markMetrics.x + markMetrics.width) - unitedAttachmentRect.x; unitedAttachmentRect.height = HB_MAX(attachmentRect.y + attachmentRect.height, markMetrics.y + markMetrics.height) - unitedAttachmentRect.y; attachmentRect = unitedAttachmentRect; lastCmb = cmb; if (rightToLeft) { item->offsets[gfrom+i].x = p.x; item->offsets[gfrom+i].y = p.y; } else { item->offsets[gfrom+i].x = p.x - baseMetrics.xOffset; item->offsets[gfrom+i].y = p.y - baseMetrics.yOffset; } item->advances[gfrom+i] = 0; } } void HB_HeuristicPosition(HB_ShaperItem *item) { HB_GetGlyphAdvances(item); HB_GlyphAttributes *attributes = item->attributes; int cEnd = -1; int i = item->num_glyphs; while (i--) { if (cEnd == -1 && attributes[i].mark) { cEnd = i; } else if (cEnd != -1 && !attributes[i].mark) { positionCluster(item, i, cEnd); cEnd = -1; } } } // set the glyph attributes heuristically. Assumes a 1 to 1 relationship between chars and glyphs // and no reordering. // also computes logClusters heuristically void HB_HeuristicSetGlyphAttributes(HB_ShaperItem *item) { const HB_UChar16 *uc = item->string + item->item.pos; hb_uint32 length = item->item.length; // ### zeroWidth and justification are missing here!!!!! assert(item->num_glyphs <= length); // qDebug("QScriptEngine::heuristicSetGlyphAttributes, num_glyphs=%d", item->num_glyphs); HB_GlyphAttributes *attributes = item->attributes; unsigned short *logClusters = item->log_clusters; hb_uint32 glyph_pos = 0; hb_uint32 i; for (i = 0; i < length; i++) { if (HB_IsHighSurrogate(uc[i]) && i < length - 1 && HB_IsLowSurrogate(uc[i + 1])) { logClusters[i] = glyph_pos; logClusters[++i] = glyph_pos; } else { logClusters[i] = glyph_pos; } ++glyph_pos; } assert(glyph_pos == item->num_glyphs); // first char in a run is never (treated as) a mark int cStart = 0; const bool symbolFont = item->face->isSymbolFont; attributes[0].mark = false; attributes[0].clusterStart = true; attributes[0].dontPrint = (!symbolFont && uc[0] == 0x00ad) || HB_IsControlChar(uc[0]); int pos = 0; HB_CharCategory lastCat; int dummy; HB_GetUnicodeCharProperties(uc[0], &lastCat, &dummy); for (i = 1; i < length; ++i) { if (logClusters[i] == pos) // same glyph continue; ++pos; while (pos < logClusters[i]) { attributes[pos] = attributes[pos-1]; ++pos; } // hide soft-hyphens by default if ((!symbolFont && uc[i] == 0x00ad) || HB_IsControlChar(uc[i])) attributes[pos].dontPrint = true; HB_CharCategory cat; int cmb; HB_GetUnicodeCharProperties(uc[i], &cat, &cmb); if (cat != HB_Mark_NonSpacing) { attributes[pos].mark = false; attributes[pos].clusterStart = true; attributes[pos].combiningClass = 0; cStart = logClusters[i]; } else { if (cmb == 0) { // Fix 0 combining classes if ((uc[pos] & 0xff00) == 0x0e00) { // thai or lao if (uc[pos] == 0xe31 || uc[pos] == 0xe34 || uc[pos] == 0xe35 || uc[pos] == 0xe36 || uc[pos] == 0xe37 || uc[pos] == 0xe47 || uc[pos] == 0xe4c || uc[pos] == 0xe4d || uc[pos] == 0xe4e) { cmb = HB_Combining_AboveRight; } else if (uc[pos] == 0xeb1 || uc[pos] == 0xeb4 || uc[pos] == 0xeb5 || uc[pos] == 0xeb6 || uc[pos] == 0xeb7 || uc[pos] == 0xebb || uc[pos] == 0xecc || uc[pos] == 0xecd) { cmb = HB_Combining_Above; } else if (uc[pos] == 0xebc) { cmb = HB_Combining_Below; } } } attributes[pos].mark = true; attributes[pos].clusterStart = false; attributes[pos].combiningClass = cmb; logClusters[i] = cStart; } // one gets an inter character justification point if the current char is not a non spacing mark. // as then the current char belongs to the last one and one gets a space justification point // after the space char. if (lastCat == HB_Separator_Space) attributes[pos-1].justification = HB_Space; else if (cat != HB_Mark_NonSpacing) attributes[pos-1].justification = HB_Character; else attributes[pos-1].justification = HB_NoJustification; lastCat = cat; } pos = logClusters[length-1]; if (lastCat == HB_Separator_Space) attributes[pos].justification = HB_Space; else attributes[pos].justification = HB_Character; } #ifndef NO_OPENTYPE static const HB_OpenTypeFeature basic_features[] = { { HB_MAKE_TAG('c', 'c', 'm', 'p'), CcmpProperty }, { HB_MAKE_TAG('l', 'i', 'g', 'a'), CcmpProperty }, { HB_MAKE_TAG('c', 'l', 'i', 'g'), CcmpProperty }, {0, 0} }; #endif HB_Bool HB_ConvertStringToGlyphIndices(HB_ShaperItem *shaper_item) { if (shaper_item->glyphIndicesPresent) { shaper_item->num_glyphs = shaper_item->initialGlyphCount; shaper_item->glyphIndicesPresent = false; return true; } return shaper_item->font->klass ->convertStringToGlyphIndices(shaper_item->font, shaper_item->string + shaper_item->item.pos, shaper_item->item.length, shaper_item->glyphs, &shaper_item->num_glyphs, shaper_item->item.bidiLevel % 2); } HB_Bool HB_BasicShape(HB_ShaperItem *shaper_item) { #ifndef NO_OPENTYPE const int availableGlyphs = shaper_item->num_glyphs; #endif if (!HB_ConvertStringToGlyphIndices(shaper_item)) return false; HB_HeuristicSetGlyphAttributes(shaper_item); #ifndef NO_OPENTYPE if (HB_SelectScript(shaper_item, basic_features)) { HB_OpenTypeShape(shaper_item, /*properties*/0); return HB_OpenTypePosition(shaper_item, availableGlyphs, /*doLogClusters*/true); } #endif HB_HeuristicPosition(shaper_item); return true; } static HB_AttributeFunction thai_attributes = 0; const HB_ScriptEngine HB_ScriptEngines[] = { // Common { HB_BasicShape, 0}, // Greek { HB_BasicShape, 0}, // Cyrillic { HB_BasicShape, 0}, // Armenian { HB_BasicShape, 0}, // Hebrew { HB_HebrewShape, 0 }, // Arabic { HB_ArabicShape, 0}, // Syriac { HB_ArabicShape, 0}, // Thaana { HB_BasicShape, 0 }, // Devanagari { HB_IndicShape, HB_IndicAttributes }, // Bengali { HB_IndicShape, HB_IndicAttributes }, // Gurmukhi { HB_IndicShape, HB_IndicAttributes }, // Gujarati { HB_IndicShape, HB_IndicAttributes }, // Oriya { HB_IndicShape, HB_IndicAttributes }, // Tamil { HB_IndicShape, HB_IndicAttributes }, // Telugu { HB_IndicShape, HB_IndicAttributes }, // Kannada { HB_IndicShape, HB_IndicAttributes }, // Malayalam { HB_IndicShape, HB_IndicAttributes }, // Sinhala { HB_IndicShape, HB_IndicAttributes }, // Thai { HB_BasicShape, thai_attributes }, // Lao { HB_BasicShape, 0 }, // Tibetan { HB_TibetanShape, HB_TibetanAttributes }, // Myanmar { HB_MyanmarShape, HB_MyanmarAttributes }, // Georgian { HB_BasicShape, 0 }, // Hangul { HB_HangulShape, 0 }, // Ogham { HB_BasicShape, 0 }, // Runic { HB_BasicShape, 0 }, // Khmer { HB_KhmerShape, HB_KhmerAttributes } }; void HB_GetCharAttributes(const HB_UChar16 *string, hb_uint32 stringLength, const HB_ScriptItem *items, hb_uint32 numItems, HB_CharAttributes *attributes) { calcLineBreaks(string, stringLength, attributes); for (hb_uint32 i = 0; i < numItems; ++i) { HB_Script script = items[i].script; if (script == HB_Script_Inherited) script = HB_Script_Common; HB_AttributeFunction attributeFunction = HB_ScriptEngines[script].charAttributes; if (!attributeFunction) continue; attributeFunction(script, string, items[i].pos, items[i].length, attributes); } } enum BreakRule { NoBreak = 0, Break = 1, Middle = 2 }; static const hb_uint8 wordbreakTable[HB_Word_ExtendNumLet + 1][HB_Word_ExtendNumLet + 1] = { // Other Format Katakana ALetter MidLetter MidNum Numeric ExtendNumLet { Break, Break, Break, Break, Break, Break, Break, Break }, // Other { Break, Break, Break, Break, Break, Break, Break, Break }, // Format { Break, Break, NoBreak, Break, Break, Break, Break, NoBreak }, // Katakana { Break, Break, Break, NoBreak, Middle, Break, NoBreak, NoBreak }, // ALetter { Break, Break, Break, Break, Break, Break, Break, Break }, // MidLetter { Break, Break, Break, Break, Break, Break, Break, Break }, // MidNum { Break, Break, Break, NoBreak, Break, Middle, NoBreak, NoBreak }, // Numeric { Break, Break, NoBreak, NoBreak, Break, Break, NoBreak, NoBreak }, // ExtendNumLet }; void HB_GetWordBoundaries(const HB_UChar16 *string, hb_uint32 stringLength, const HB_ScriptItem * /*items*/, hb_uint32 /*numItems*/, HB_CharAttributes *attributes) { if (stringLength == 0) return; unsigned int brk = HB_GetWordClass(string[0]); attributes[0].wordBoundary = true; for (hb_uint32 i = 1; i < stringLength; ++i) { if (!attributes[i].charStop) { attributes[i].wordBoundary = false; continue; } hb_uint32 nbrk = HB_GetWordClass(string[i]); if (nbrk == HB_Word_Format) { attributes[i].wordBoundary = (HB_GetSentenceClass(string[i-1]) == HB_Sentence_Sep); continue; } BreakRule rule = (BreakRule)wordbreakTable[brk][nbrk]; if (rule == Middle) { rule = Break; hb_uint32 lookahead = i + 1; while (lookahead < stringLength) { hb_uint32 testbrk = HB_GetWordClass(string[lookahead]); if (testbrk == HB_Word_Format && HB_GetSentenceClass(string[lookahead]) != HB_Sentence_Sep) { ++lookahead; continue; } if (testbrk == brk) { rule = NoBreak; while (i < lookahead) attributes[i++].wordBoundary = false; nbrk = testbrk; } break; } } attributes[i].wordBoundary = (rule == Break); brk = nbrk; } } enum SentenceBreakStates { SB_Initial, SB_Upper, SB_UpATerm, SB_ATerm, SB_ATermC, SB_ACS, SB_STerm, SB_STermC, SB_SCS, SB_BAfter, SB_Break, SB_Look }; static const hb_uint8 sentenceBreakTable[HB_Sentence_Close + 1][HB_Sentence_Close + 1] = { // Other Sep Format Sp Lower Upper OLetter Numeric ATerm STerm Close { SB_Initial, SB_BAfter , SB_Initial, SB_Initial, SB_Initial, SB_Upper , SB_Initial, SB_Initial, SB_ATerm , SB_STerm , SB_Initial }, // SB_Initial, { SB_Initial, SB_BAfter , SB_Upper , SB_Initial, SB_Initial, SB_Upper , SB_Initial, SB_Initial, SB_UpATerm, SB_STerm , SB_Initial }, // SB_Upper { SB_Look , SB_BAfter , SB_UpATerm, SB_ACS , SB_Initial, SB_Upper , SB_Break , SB_Initial, SB_ATerm , SB_STerm , SB_ATermC }, // SB_UpATerm { SB_Look , SB_BAfter , SB_ATerm , SB_ACS , SB_Initial, SB_Break , SB_Break , SB_Initial, SB_ATerm , SB_STerm , SB_ATermC }, // SB_ATerm { SB_Look , SB_BAfter , SB_ATermC , SB_ACS , SB_Initial, SB_Break , SB_Break , SB_Look , SB_ATerm , SB_STerm , SB_ATermC }, // SB_ATermC, { SB_Look , SB_BAfter , SB_ACS , SB_ACS , SB_Initial, SB_Break , SB_Break , SB_Look , SB_ATerm , SB_STerm , SB_Look }, // SB_ACS, { SB_Break , SB_BAfter , SB_STerm , SB_SCS , SB_Break , SB_Break , SB_Break , SB_Break , SB_ATerm , SB_STerm , SB_STermC }, // SB_STerm, { SB_Break , SB_BAfter , SB_STermC , SB_SCS , SB_Break , SB_Break , SB_Break , SB_Break , SB_ATerm , SB_STerm , SB_STermC }, // SB_STermC, { SB_Break , SB_BAfter , SB_SCS , SB_SCS , SB_Break , SB_Break , SB_Break , SB_Break , SB_ATerm , SB_STerm , SB_Break }, // SB_SCS, { SB_Break , SB_Break , SB_Break , SB_Break , SB_Break , SB_Break , SB_Break , SB_Break , SB_Break , SB_Break , SB_Break }, // SB_BAfter, }; void HB_GetSentenceBoundaries(const HB_UChar16 *string, hb_uint32 stringLength, const HB_ScriptItem * /*items*/, hb_uint32 /*numItems*/, HB_CharAttributes *attributes) { if (stringLength == 0) return; hb_uint32 brk = sentenceBreakTable[SB_Initial][HB_GetSentenceClass(string[0])]; attributes[0].sentenceBoundary = true; for (hb_uint32 i = 1; i < stringLength; ++i) { if (!attributes[i].charStop) { attributes[i].sentenceBoundary = false; continue; } brk = sentenceBreakTable[brk][HB_GetSentenceClass(string[i])]; if (brk == SB_Look) { brk = SB_Break; hb_uint32 lookahead = i + 1; while (lookahead < stringLength) { hb_uint32 sbrk = HB_GetSentenceClass(string[lookahead]); if (sbrk != HB_Sentence_Other && sbrk != HB_Sentence_Numeric && sbrk != HB_Sentence_Close) { break; } else if (sbrk == HB_Sentence_Lower) { brk = SB_Initial; break; } ++lookahead; } if (brk == SB_Initial) { while (i < lookahead) attributes[i++].sentenceBoundary = false; } } if (brk == SB_Break) { attributes[i].sentenceBoundary = true; brk = sentenceBreakTable[SB_Initial][HB_GetSentenceClass(string[i])]; } else { attributes[i].sentenceBoundary = false; } } } static inline char *tag_to_string(HB_UInt tag) { static char string[5]; string[0] = (tag >> 24)&0xff; string[1] = (tag >> 16)&0xff; string[2] = (tag >> 8)&0xff; string[3] = tag&0xff; string[4] = 0; return string; } #ifdef OT_DEBUG static void dump_string(HB_Buffer buffer) { for (uint i = 0; i < buffer->in_length; ++i) { qDebug(" %x: cluster=%d", buffer->in_string[i].gindex, buffer->in_string[i].cluster); } } #define DEBUG printf #else #define DEBUG if (1) ; else printf #endif #define DefaultLangSys 0xffff #define DefaultScript HB_MAKE_TAG('D', 'F', 'L', 'T') enum { RequiresGsub = 1, RequiresGpos = 2 }; struct OTScripts { unsigned int tag; int flags; }; static const OTScripts ot_scripts [] = { // Common { HB_MAKE_TAG('l', 'a', 't', 'n'), 0 }, // Greek { HB_MAKE_TAG('g', 'r', 'e', 'k'), 0 }, // Cyrillic { HB_MAKE_TAG('c', 'y', 'r', 'l'), 0 }, // Armenian { HB_MAKE_TAG('a', 'r', 'm', 'n'), 0 }, // Hebrew { HB_MAKE_TAG('h', 'e', 'b', 'r'), 1 }, // Arabic { HB_MAKE_TAG('a', 'r', 'a', 'b'), 1 }, // Syriac { HB_MAKE_TAG('s', 'y', 'r', 'c'), 1 }, // Thaana { HB_MAKE_TAG('t', 'h', 'a', 'a'), 1 }, // Devanagari { HB_MAKE_TAG('d', 'e', 'v', 'a'), 1 }, // Bengali { HB_MAKE_TAG('b', 'e', 'n', 'g'), 1 }, // Gurmukhi { HB_MAKE_TAG('g', 'u', 'r', 'u'), 1 }, // Gujarati { HB_MAKE_TAG('g', 'u', 'j', 'r'), 1 }, // Oriya { HB_MAKE_TAG('o', 'r', 'y', 'a'), 1 }, // Tamil { HB_MAKE_TAG('t', 'a', 'm', 'l'), 1 }, // Telugu { HB_MAKE_TAG('t', 'e', 'l', 'u'), 1 }, // Kannada { HB_MAKE_TAG('k', 'n', 'd', 'a'), 1 }, // Malayalam { HB_MAKE_TAG('m', 'l', 'y', 'm'), 1 }, // Sinhala { HB_MAKE_TAG('s', 'i', 'n', 'h'), 1 }, // Thai { HB_MAKE_TAG('t', 'h', 'a', 'i'), 1 }, // Lao { HB_MAKE_TAG('l', 'a', 'o', ' '), 1 }, // Tibetan { HB_MAKE_TAG('t', 'i', 'b', 't'), 1 }, // Myanmar { HB_MAKE_TAG('m', 'y', 'm', 'r'), 1 }, // Georgian { HB_MAKE_TAG('g', 'e', 'o', 'r'), 0 }, // Hangul { HB_MAKE_TAG('h', 'a', 'n', 'g'), 1 }, // Ogham { HB_MAKE_TAG('o', 'g', 'a', 'm'), 0 }, // Runic { HB_MAKE_TAG('r', 'u', 'n', 'r'), 0 }, // Khmer { HB_MAKE_TAG('k', 'h', 'm', 'r'), 1 } }; enum { NumOTScripts = sizeof(ot_scripts)/sizeof(OTScripts) }; static HB_Bool checkScript(HB_Face face, int script) { assert(script < HB_ScriptCount); if (!face->gsub && !face->gpos) return false; unsigned int tag = ot_scripts[script].tag; int requirements = ot_scripts[script].flags; if (requirements & RequiresGsub) { if (!face->gsub) return false; HB_UShort script_index; HB_Error error = HB_GSUB_Select_Script(face->gsub, tag, &script_index); if (error) { DEBUG("could not select script %d in GSub table: %d", (int)script, error); error = HB_GSUB_Select_Script(face->gsub, HB_MAKE_TAG('D', 'F', 'L', 'T'), &script_index); if (error) return false; } } if (requirements & RequiresGpos) { if (!face->gpos) return false; HB_UShort script_index; HB_Error error = HB_GPOS_Select_Script(face->gpos, script, &script_index); if (error) { DEBUG("could not select script in gpos table: %d", error); error = HB_GPOS_Select_Script(face->gpos, HB_MAKE_TAG('D', 'F', 'L', 'T'), &script_index); if (error) return false; } } return true; } static HB_Stream getTableStream(void *font, HB_GetFontTableFunc tableFunc, HB_Tag tag) { HB_Error error; HB_UInt length = 0; HB_Stream stream = 0; if (!font) return 0; error = tableFunc(font, tag, 0, &length); if (error) return 0; stream = (HB_Stream)malloc(sizeof(HB_StreamRec)); stream->base = (HB_Byte*)malloc(length); error = tableFunc(font, tag, stream->base, &length); if (error) { _hb_close_stream(stream); return 0; } stream->size = length; stream->pos = 0; stream->cursor = NULL; return stream; } HB_Face HB_NewFace(void *font, HB_GetFontTableFunc tableFunc) { HB_Face face = (HB_Face )malloc(sizeof(HB_FaceRec)); face->isSymbolFont = false; face->gdef = 0; face->gpos = 0; face->gsub = 0; face->current_script = HB_ScriptCount; face->current_flags = HB_ShaperFlag_Default; face->has_opentype_kerning = false; face->tmpAttributes = 0; face->tmpLogClusters = 0; face->glyphs_substituted = false; HB_Error error; HB_Stream stream; HB_Stream gdefStream; gdefStream = getTableStream(font, tableFunc, TTAG_GDEF); if (!gdefStream || (error = HB_Load_GDEF_Table(gdefStream, &face->gdef))) { //DEBUG("error loading gdef table: %d", error); face->gdef = 0; } //DEBUG() << "trying to load gsub table"; stream = getTableStream(font, tableFunc, TTAG_GSUB); if (!stream || (error = HB_Load_GSUB_Table(stream, &face->gsub, face->gdef, gdefStream))) { face->gsub = 0; if (error != HB_Err_Not_Covered) { //DEBUG("error loading gsub table: %d", error); } else { //DEBUG("face doesn't have a gsub table"); } } _hb_close_stream(stream); stream = getTableStream(font, tableFunc, TTAG_GPOS); if (!stream || (error = HB_Load_GPOS_Table(stream, &face->gpos, face->gdef, gdefStream))) { face->gpos = 0; DEBUG("error loading gpos table: %d", error); } _hb_close_stream(stream); _hb_close_stream(gdefStream); for (unsigned int i = 0; i < HB_ScriptCount; ++i) face->supported_scripts[i] = checkScript(face, i); hb_buffer_new(&face->buffer); return face; } void HB_FreeFace(HB_Face face) { if (!face) return; if (face->gpos) HB_Done_GPOS_Table(face->gpos); if (face->gsub) HB_Done_GSUB_Table(face->gsub); if (face->gdef) HB_Done_GDEF_Table(face->gdef); if (face->buffer) hb_buffer_free(face->buffer); if (face->tmpAttributes) free(face->tmpAttributes); if (face->tmpLogClusters) free(face->tmpLogClusters); free(face); } HB_Bool HB_SelectScript(HB_ShaperItem *shaper_item, const HB_OpenTypeFeature *features) { HB_Script script = shaper_item->item.script; if (!shaper_item->face->supported_scripts[script]) return false; HB_Face face = shaper_item->face; if (face->current_script == script && face->current_flags == shaper_item->shaperFlags) return true; face->current_script = script; face->current_flags = shaper_item->shaperFlags; assert(script < HB_ScriptCount); // find script in our list of supported scripts. unsigned int tag = ot_scripts[script].tag; if (face->gsub && features) { #ifdef OT_DEBUG { HB_FeatureList featurelist = face->gsub->FeatureList; int numfeatures = featurelist.FeatureCount; DEBUG("gsub table has %d features", numfeatures); for (int i = 0; i < numfeatures; i++) { HB_FeatureRecord *r = featurelist.FeatureRecord + i; DEBUG(" feature '%s'", tag_to_string(r->FeatureTag)); } } #endif HB_GSUB_Clear_Features(face->gsub); HB_UShort script_index; HB_Error error = HB_GSUB_Select_Script(face->gsub, tag, &script_index); if (!error) { DEBUG("script %s has script index %d", tag_to_string(script), script_index); while (features->tag) { HB_UShort feature_index; error = HB_GSUB_Select_Feature(face->gsub, features->tag, script_index, 0xffff, &feature_index); if (!error) { DEBUG(" adding feature %s", tag_to_string(features->tag)); HB_GSUB_Add_Feature(face->gsub, feature_index, features->property); } ++features; } } } // reset face->has_opentype_kerning = false; if (face->gpos) { HB_GPOS_Clear_Features(face->gpos); HB_UShort script_index; HB_Error error = HB_GPOS_Select_Script(face->gpos, tag, &script_index); if (!error) { #ifdef OT_DEBUG { HB_FeatureList featurelist = face->gpos->FeatureList; int numfeatures = featurelist.FeatureCount; DEBUG("gpos table has %d features", numfeatures); for(int i = 0; i < numfeatures; i++) { HB_FeatureRecord *r = featurelist.FeatureRecord + i; HB_UShort feature_index; HB_GPOS_Select_Feature(face->gpos, r->FeatureTag, script_index, 0xffff, &feature_index); DEBUG(" feature '%s'", tag_to_string(r->FeatureTag)); } } #endif HB_UInt *feature_tag_list_buffer; error = HB_GPOS_Query_Features(face->gpos, script_index, 0xffff, &feature_tag_list_buffer); if (!error) { HB_UInt *feature_tag_list = feature_tag_list_buffer; while (*feature_tag_list) { HB_UShort feature_index; if (*feature_tag_list == HB_MAKE_TAG('k', 'e', 'r', 'n')) { if (face->current_flags & HB_ShaperFlag_NoKerning) { ++feature_tag_list; continue; } face->has_opentype_kerning = true; } error = HB_GPOS_Select_Feature(face->gpos, *feature_tag_list, script_index, 0xffff, &feature_index); if (!error) HB_GPOS_Add_Feature(face->gpos, feature_index, PositioningProperties); ++feature_tag_list; } FREE(feature_tag_list_buffer); } } } return true; } HB_Bool HB_OpenTypeShape(HB_ShaperItem *item, const hb_uint32 *properties) { HB_Face face = item->face; face->length = item->num_glyphs; hb_buffer_clear(face->buffer); face->tmpAttributes = (HB_GlyphAttributes *) realloc(face->tmpAttributes, face->length*sizeof(HB_GlyphAttributes)); face->tmpLogClusters = (unsigned int *) realloc(face->tmpLogClusters, face->length*sizeof(unsigned int)); for (int i = 0; i < face->length; ++i) { hb_buffer_add_glyph(face->buffer, item->glyphs[i], properties ? properties[i] : 0, i); face->tmpAttributes[i] = item->attributes[i]; face->tmpLogClusters[i] = item->log_clusters[i]; } #ifdef OT_DEBUG DEBUG("-----------------------------------------"); // DEBUG("log clusters before shaping:"); // for (int j = 0; j < length; j++) // DEBUG(" log[%d] = %d", j, item->log_clusters[j]); DEBUG("original glyphs: %p", item->glyphs); for (int i = 0; i < length; ++i) DEBUG(" glyph=%4x", hb_buffer->in_string[i].gindex); // dump_string(hb_buffer); #endif face->glyphs_substituted = false; if (face->gsub) { unsigned int error = HB_GSUB_Apply_String(face->gsub, face->buffer); if (error && error != HB_Err_Not_Covered) return false; face->glyphs_substituted = (error != HB_Err_Not_Covered); } #ifdef OT_DEBUG // DEBUG("log clusters before shaping:"); // for (int j = 0; j < length; j++) // DEBUG(" log[%d] = %d", j, item->log_clusters[j]); DEBUG("shaped glyphs:"); for (int i = 0; i < length; ++i) DEBUG(" glyph=%4x", hb_buffer->in_string[i].gindex); DEBUG("-----------------------------------------"); // dump_string(hb_buffer); #endif return true; } HB_Bool HB_OpenTypePosition(HB_ShaperItem *item, int availableGlyphs, HB_Bool doLogClusters) { HB_Face face = item->face; bool glyphs_positioned = false; if (face->gpos) { memset(face->buffer->positions, 0, face->buffer->in_length*sizeof(HB_PositionRec)); // #### check that passing "false,false" is correct glyphs_positioned = HB_GPOS_Apply_String(item->font, face->gpos, face->current_flags, face->buffer, false, false) != HB_Err_Not_Covered; } if (!face->glyphs_substituted && !glyphs_positioned) { HB_GetGlyphAdvances(item); return true; // nothing to do for us } // make sure we have enough space to write everything back if (availableGlyphs < (int)face->buffer->in_length) { item->num_glyphs = face->buffer->in_length; return false; } HB_Glyph *glyphs = item->glyphs; HB_GlyphAttributes *attributes = item->attributes; for (unsigned int i = 0; i < face->buffer->in_length; ++i) { glyphs[i] = face->buffer->in_string[i].gindex; attributes[i] = face->tmpAttributes[face->buffer->in_string[i].cluster]; if (i && face->buffer->in_string[i].cluster == face->buffer->in_string[i-1].cluster) attributes[i].clusterStart = false; } item->num_glyphs = face->buffer->in_length; if (doLogClusters) { // we can't do this for indic, as we pass the stuf in syllables and it's easier to do it in the shaper. unsigned short *logClusters = item->log_clusters; int clusterStart = 0; int oldCi = 0; for (unsigned int i = 0; i < face->buffer->in_length; ++i) { int ci = face->buffer->in_string[i].cluster; // DEBUG(" ci[%d] = %d mark=%d, cmb=%d, cs=%d", // i, ci, glyphAttributes[i].mark, glyphAttributes[i].combiningClass, glyphAttributes[i].clusterStart); if (!attributes[i].mark && attributes[i].clusterStart && ci != oldCi) { for (int j = oldCi; j < ci; j++) logClusters[j] = clusterStart; clusterStart = i; oldCi = ci; } } for (int j = oldCi; j < face->length; j++) logClusters[j] = clusterStart; } // calulate the advances for the shaped glyphs // DEBUG("unpositioned: "); // positioning code: if (glyphs_positioned) { HB_GetGlyphAdvances(item); HB_Position positions = face->buffer->positions; HB_Fixed *advances = item->advances; // DEBUG("positioned glyphs:"); for (unsigned int i = 0; i < face->buffer->in_length; i++) { // DEBUG(" %d:\t orig advance: (%d/%d)\tadv=(%d/%d)\tpos=(%d/%d)\tback=%d\tnew_advance=%d", i, // glyphs[i].advance.x.toInt(), glyphs[i].advance.y.toInt(), // (int)(positions[i].x_advance >> 6), (int)(positions[i].y_advance >> 6), // (int)(positions[i].x_pos >> 6), (int)(positions[i].y_pos >> 6), // positions[i].back, positions[i].new_advance); HB_Fixed adjustment = (item->item.bidiLevel % 2) ? -positions[i].x_advance : positions[i].x_advance; if (!(face->current_flags & HB_ShaperFlag_UseDesignMetrics)) adjustment = HB_FIXED_ROUND(adjustment); if (positions[i].new_advance) { advances[i] = adjustment; } else { advances[i] += adjustment; } int back = 0; HB_FixedPoint *offsets = item->offsets; offsets[i].x = positions[i].x_pos; offsets[i].y = positions[i].y_pos; while (positions[i - back].back) { back += positions[i - back].back; offsets[i].x += positions[i - back].x_pos; offsets[i].y += positions[i - back].y_pos; } offsets[i].y = -offsets[i].y; if (item->item.bidiLevel % 2) { // ### may need to go back multiple glyphs like in ltr back = positions[i].back; while (back--) offsets[i].x -= advances[i-back]; } else { back = 0; while (positions[i - back].back) { back += positions[i - back].back; offsets[i].x -= advances[i-back]; } } // DEBUG(" ->\tadv=%d\tpos=(%d/%d)", // glyphs[i].advance.x.toInt(), glyphs[i].offset.x.toInt(), glyphs[i].offset.y.toInt()); } item->kerning_applied = face->has_opentype_kerning; } else { HB_HeuristicPosition(item); } #ifdef OT_DEBUG if (doLogClusters) { DEBUG("log clusters after shaping:"); for (int j = 0; j < length; j++) DEBUG(" log[%d] = %d", j, item->log_clusters[j]); } DEBUG("final glyphs:"); for (int i = 0; i < (int)hb_buffer->in_length; ++i) DEBUG(" glyph=%4x char_index=%d mark: %d cmp: %d, clusterStart: %d advance=%d/%d offset=%d/%d", glyphs[i].glyph, hb_buffer->in_string[i].cluster, glyphs[i].attributes.mark, glyphs[i].attributes.combiningClass, glyphs[i].attributes.clusterStart, glyphs[i].advance.x.toInt(), glyphs[i].advance.y.toInt(), glyphs[i].offset.x.toInt(), glyphs[i].offset.y.toInt()); DEBUG("-----------------------------------------"); #endif return true; } HB_Bool HB_ShapeItem(HB_ShaperItem *shaper_item) { HB_Bool result = false; if (shaper_item->num_glyphs < shaper_item->item.length) { shaper_item->num_glyphs = shaper_item->item.length; return false; } assert(shaper_item->item.script < HB_ScriptCount); result = HB_ScriptEngines[shaper_item->item.script].shape(shaper_item); shaper_item->glyphIndicesPresent = false; return result; }