зеркало из https://github.com/mozilla/gecko-dev.git
276 строки
11 KiB
C++
276 строки
11 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Foundation code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Bas Schouten <bschouten@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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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#define MAX_RANGE_LENGTH 25000
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PRBool
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gfxDWriteShaper::InitTextRun(gfxContext *aContext,
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gfxTextRun *aTextRun,
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const PRUnichar *aString,
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PRUint32 aRunStart,
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PRUint32 aRunLength,
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PRInt32 aRunScript)
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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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aTextRun->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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gfxTextRun::CompressedGlyph g;
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nsRefPtr<IDWriteTextAnalyzer> analyzer;
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hr = gfxWindowsPlatform::GetPlatform()->GetDWriteFactory()->
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CreateTextAnalyzer(getter_AddRefs(analyzer));
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if (FAILED(hr)) {
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return PR_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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* to be on the safe side here we split up any ranges over MAX_RANGE_LENGTH
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* characters.
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* TODO: Figure out what exactly is going on, and what is a safe number, and
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* why.
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*/
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PRBool result = PR_TRUE;
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UINT32 rangeOffset = 0;
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while (rangeOffset < aRunLength) {
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PRUint32 rangeLen = NS_MIN<PRUint32>(aRunLength - rangeOffset,
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MAX_RANGE_LENGTH);
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if (rangeOffset + rangeLen < aRunLength) {
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// Iterate backwards to find a decent place to break shaping:
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// look for a whitespace char, and if that's not found then
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// at least a char where IsClusterStart is true.
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// However, we never iterate back further than half-way;
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// if a decent break is not found by then, we just chop anyway
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// at the original range length.
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PRUint32 adjRangeLen = 0;
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const PRUnichar *rangeStr = aString + aRunStart + rangeOffset;
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for (PRUint32 i = rangeLen; i > MAX_RANGE_LENGTH / 2; i--) {
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if (nsCRT::IsAsciiSpace(rangeStr[i])) {
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adjRangeLen = i;
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break;
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}
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if (adjRangeLen == 0 &&
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aTextRun->IsClusterStart(aRunStart + rangeOffset + i)) {
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adjRangeLen = i;
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}
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}
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if (adjRangeLen != 0) {
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rangeLen = adjRangeLen;
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}
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}
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gfxTextRange range(aRunStart + rangeOffset,
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aRunStart + rangeOffset + rangeLen);
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rangeOffset += rangeLen;
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TextAnalysis analysis(aString + range.start, range.Length(),
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NULL,
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readingDirection);
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TextAnalysis::Run *runHead;
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DWRITE_LINE_BREAKPOINT *linebreaks;
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hr = analysis.GenerateResults(analyzer, &runHead, &linebreaks);
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if (FAILED(hr)) {
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NS_WARNING("Analyzer failed to generate results.");
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result = PR_FALSE;
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break;
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}
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PRUint32 appUnitsPerDevPixel = aTextRun->GetAppUnitsPerDevUnit();
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UINT32 maxGlyphs = 0;
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trymoreglyphs:
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if ((PR_UINT32_MAX - 3 * range.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. Next range it is.
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continue;
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}
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maxGlyphs += 3 * range.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(range.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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continue;
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}
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UINT32 actualGlyphs;
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hr = analyzer->GetGlyphs(aString + range.start, range.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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result = PR_FALSE;
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break;
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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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continue;
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}
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hr = analyzer->GetGlyphPlacements(aString + range.start,
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clusters.Elements(),
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textProperties.Elements(),
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range.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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if (FAILED(hr)) {
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NS_WARNING("Analyzer failed to get glyph placements.");
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result = PR_FALSE;
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break;
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}
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nsAutoTArray<gfxTextRun::DetailedGlyph,1> detailedGlyphs;
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for (unsigned int c = 0; c < range.Length(); c++) {
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PRUint32 k = clusters[c];
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PRUint32 absC = range.start + c;
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if (c > 0 && k == clusters[c - 1]) {
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g.SetComplex(aTextRun->IsClusterStart(absC), PR_FALSE, 0);
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aTextRun->SetGlyphs(absC, g, nsnull);
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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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PRUint32 glyphCount = actualGlyphs - k;
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PRUint32 nextClusterOffset;
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for (nextClusterOffset = c + 1;
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nextClusterOffset < range.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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PRInt32 advance = (PRInt32)(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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aTextRun->IsClusterStart(absC) &&
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gfxTextRun::CompressedGlyph::IsSimpleAdvance(advance) &&
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gfxTextRun::CompressedGlyph::IsSimpleGlyphID(indices[k])) {
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aTextRun->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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(PRInt32)(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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aTextRun->SetGlyphs(
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absC,
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g.SetComplex(aTextRun->IsClusterStart(absC),
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PR_TRUE,
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glyphCount),
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detailedGlyphs.Elements());
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}
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}
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}
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return result;
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}
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