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97 lines
3.3 KiB
C++
97 lines
3.3 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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//#define FORCE_PR_LOG
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#include "gfxGDIShaper.h"
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/**********************************************************************
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*
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* class gfxGDIShaper
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*
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**********************************************************************/
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bool
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gfxGDIShaper::ShapeText(gfxContext *aContext,
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const char16_t *aText,
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uint32_t aOffset,
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uint32_t aLength,
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int32_t aScript,
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gfxShapedText *aShapedText)
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{
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DCFromContext dc(aContext);
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AutoSelectFont selectFont(dc, static_cast<gfxGDIFont*>(mFont)->GetHFONT());
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uint32_t length = aLength;
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AutoFallibleTArray<WORD,500> glyphArray;
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if (!glyphArray.SetLength(length)) {
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return false;
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}
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WORD *glyphs = glyphArray.Elements();
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DWORD ret = ::GetGlyphIndicesW(dc, char16ptr_t(aText), length,
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glyphs, GGI_MARK_NONEXISTING_GLYPHS);
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if (ret == GDI_ERROR) {
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return false;
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}
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for (int k = 0; k < length; k++) {
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if (glyphs[k] == 0xFFFF)
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return false;
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}
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SIZE size;
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AutoFallibleTArray<int,500> partialWidthArray;
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if (!partialWidthArray.SetLength(length)) {
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return false;
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}
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BOOL success = ::GetTextExtentExPointI(dc,
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glyphs,
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length,
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INT_MAX,
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nullptr,
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partialWidthArray.Elements(),
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&size);
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if (!success) {
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return false;
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}
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gfxTextRun::CompressedGlyph g;
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gfxTextRun::CompressedGlyph *charGlyphs =
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aShapedText->GetCharacterGlyphs();
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uint32_t i;
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int32_t lastWidth = 0;
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int32_t appUnitsPerDevPixel = aShapedText->GetAppUnitsPerDevUnit();
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for (i = 0; i < length; ++i) {
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uint32_t offset = aOffset + i;
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int32_t advancePixels = partialWidthArray[i] - lastWidth;
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lastWidth = partialWidthArray[i];
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int32_t advanceAppUnits = advancePixels * appUnitsPerDevPixel;
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WCHAR glyph = glyphs[i];
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NS_ASSERTION(!gfxFontGroup::IsInvalidChar(aText[i]),
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"Invalid character detected!");
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bool atClusterStart = charGlyphs[offset].IsClusterStart();
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if (advanceAppUnits >= 0 &&
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gfxShapedWord::CompressedGlyph::IsSimpleAdvance(advanceAppUnits) &&
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gfxShapedWord::CompressedGlyph::IsSimpleGlyphID(glyph) &&
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atClusterStart)
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{
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charGlyphs[offset].SetSimpleGlyph(advanceAppUnits, glyph);
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} else {
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gfxShapedText::DetailedGlyph details;
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details.mGlyphID = glyph;
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details.mAdvance = advanceAppUnits;
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details.mXOffset = 0;
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details.mYOffset = 0;
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aShapedText->SetGlyphs(offset,
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g.SetComplex(atClusterStart, true, 1),
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&details);
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}
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}
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return true;
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}
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