зеркало из https://github.com/mozilla/gecko-dev.git
226 строки
8.7 KiB
C++
226 строки
8.7 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "gfxDWriteShaper.h"
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#include "gfxWindowsPlatform.h"
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#include <dwrite.h>
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#include "gfxDWriteTextAnalysis.h"
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#include "nsCRT.h"
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bool
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gfxDWriteShaper::ShapeWord(gfxContext *aContext,
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gfxShapedWord *aShapedWord,
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const PRUnichar *aString)
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{
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HRESULT hr;
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// TODO: Handle TEST_DISABLE_OPTIONAL_LIGATURES
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DWRITE_READING_DIRECTION readingDirection =
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aShapedWord->IsRightToLeft()
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? DWRITE_READING_DIRECTION_RIGHT_TO_LEFT
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: DWRITE_READING_DIRECTION_LEFT_TO_RIGHT;
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gfxDWriteFont *font = static_cast<gfxDWriteFont*>(mFont);
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gfxShapedWord::CompressedGlyph g;
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IDWriteTextAnalyzer *analyzer =
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gfxWindowsPlatform::GetPlatform()->GetDWriteAnalyzer();
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if (!analyzer) {
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return false;
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}
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/**
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* There's an internal 16-bit limit on some things inside the analyzer,
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* but we never attempt to shape a word longer than 64K characters
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* in a single gfxShapedWord, so we cannot exceed that limit.
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*/
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UINT32 length = aShapedWord->Length();
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TextAnalysis analysis(aString, length, NULL, readingDirection);
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TextAnalysis::Run *runHead;
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hr = analysis.GenerateResults(analyzer, &runHead);
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if (FAILED(hr)) {
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NS_WARNING("Analyzer failed to generate results.");
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return false;
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}
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uint32_t appUnitsPerDevPixel = aShapedWord->AppUnitsPerDevUnit();
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UINT32 maxGlyphs = 0;
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trymoreglyphs:
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if ((PR_UINT32_MAX - 3 * length / 2 + 16) < maxGlyphs) {
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// This isn't going to work, we're going to cross the UINT32 upper
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// limit. Give up.
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NS_WARNING("Shaper needs to generate more than 2^32 glyphs?!");
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return false;
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}
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maxGlyphs += 3 * length / 2 + 16;
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nsAutoTArray<UINT16, 400> clusters;
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nsAutoTArray<UINT16, 400> indices;
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nsAutoTArray<DWRITE_SHAPING_TEXT_PROPERTIES, 400> textProperties;
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nsAutoTArray<DWRITE_SHAPING_GLYPH_PROPERTIES, 400> glyphProperties;
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if (!clusters.SetLength(length) ||
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!indices.SetLength(maxGlyphs) ||
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!textProperties.SetLength(maxGlyphs) ||
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!glyphProperties.SetLength(maxGlyphs)) {
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NS_WARNING("Shaper failed to allocate memory.");
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return false;
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}
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UINT32 actualGlyphs;
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hr = analyzer->GetGlyphs(aString, length,
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font->GetFontFace(), FALSE,
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readingDirection == DWRITE_READING_DIRECTION_RIGHT_TO_LEFT,
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&runHead->mScript, NULL, NULL, NULL, NULL, 0,
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maxGlyphs, clusters.Elements(), textProperties.Elements(),
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indices.Elements(), glyphProperties.Elements(), &actualGlyphs);
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if (hr == HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER)) {
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// We increase the amount of glyphs and try again.
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goto trymoreglyphs;
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}
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if (FAILED(hr)) {
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NS_WARNING("Analyzer failed to get glyphs.");
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return false;
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}
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WORD gID = indices[0];
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nsAutoTArray<FLOAT, 400> advances;
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nsAutoTArray<DWRITE_GLYPH_OFFSET, 400> glyphOffsets;
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if (!advances.SetLength(actualGlyphs) ||
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!glyphOffsets.SetLength(actualGlyphs)) {
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NS_WARNING("Shaper failed to allocate memory.");
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return false;
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}
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if (!static_cast<gfxDWriteFont*>(mFont)->mUseSubpixelPositions) {
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hr = analyzer->GetGdiCompatibleGlyphPlacements(
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aString,
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clusters.Elements(),
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textProperties.Elements(),
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length,
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indices.Elements(),
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glyphProperties.Elements(),
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actualGlyphs,
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font->GetFontFace(),
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font->GetAdjustedSize(),
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1.0,
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nullptr,
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FALSE,
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FALSE,
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FALSE,
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&runHead->mScript,
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NULL,
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NULL,
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NULL,
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0,
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advances.Elements(),
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glyphOffsets.Elements());
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} else {
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hr = analyzer->GetGlyphPlacements(aString,
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clusters.Elements(),
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textProperties.Elements(),
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length,
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indices.Elements(),
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glyphProperties.Elements(),
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actualGlyphs,
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font->GetFontFace(),
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font->GetAdjustedSize(),
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FALSE,
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FALSE,
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&runHead->mScript,
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NULL,
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NULL,
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NULL,
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0,
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advances.Elements(),
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glyphOffsets.Elements());
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}
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if (FAILED(hr)) {
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NS_WARNING("Analyzer failed to get glyph placements.");
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return false;
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}
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nsAutoTArray<gfxTextRun::DetailedGlyph,1> detailedGlyphs;
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for (unsigned int c = 0; c < length; c++) {
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uint32_t k = clusters[c];
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uint32_t absC = c;
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if (c > 0 && k == clusters[c - 1]) {
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g.SetComplex(aShapedWord->IsClusterStart(absC), false, 0);
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aShapedWord->SetGlyphs(absC, g, nullptr);
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// This is a cluster continuation. No glyph here.
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continue;
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}
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// Count glyphs for this character
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uint32_t glyphCount = actualGlyphs - k;
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uint32_t nextClusterOffset;
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for (nextClusterOffset = c + 1;
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nextClusterOffset < length; ++nextClusterOffset) {
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if (clusters[nextClusterOffset] > k) {
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glyphCount = clusters[nextClusterOffset] - k;
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break;
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}
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}
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int32_t advance = (int32_t)(advances[k] * appUnitsPerDevPixel);
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if (glyphCount == 1 && advance >= 0 &&
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glyphOffsets[k].advanceOffset == 0 &&
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glyphOffsets[k].ascenderOffset == 0 &&
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aShapedWord->IsClusterStart(absC) &&
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gfxShapedWord::CompressedGlyph::IsSimpleAdvance(advance) &&
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gfxShapedWord::CompressedGlyph::IsSimpleGlyphID(indices[k])) {
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aShapedWord->SetSimpleGlyph(absC,
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g.SetSimpleGlyph(advance,
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indices[k]));
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} else {
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if (detailedGlyphs.Length() < glyphCount) {
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if (!detailedGlyphs.AppendElements(
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glyphCount - detailedGlyphs.Length())) {
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continue;
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}
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}
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float totalAdvance = 0;
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for (unsigned int z = 0; z < glyphCount; z++) {
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detailedGlyphs[z].mGlyphID = indices[k + z];
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detailedGlyphs[z].mAdvance =
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(int32_t)(advances[k + z]
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* appUnitsPerDevPixel);
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if (readingDirection ==
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DWRITE_READING_DIRECTION_RIGHT_TO_LEFT) {
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detailedGlyphs[z].mXOffset =
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(totalAdvance +
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glyphOffsets[k + z].advanceOffset)
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* appUnitsPerDevPixel;
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} else {
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detailedGlyphs[z].mXOffset =
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glyphOffsets[k + z].advanceOffset *
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appUnitsPerDevPixel;
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}
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detailedGlyphs[z].mYOffset =
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-glyphOffsets[k + z].ascenderOffset *
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appUnitsPerDevPixel;
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totalAdvance += advances[k + z];
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}
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aShapedWord->SetGlyphs(
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absC,
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g.SetComplex(aShapedWord->IsClusterStart(absC),
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true,
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glyphCount),
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detailedGlyphs.Elements());
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}
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}
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return true;
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}
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