/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #include "gfxTextRun.h" #include "gfxGlyphExtents.h" #include "gfxPlatformFontList.h" #include "gfxUserFontSet.h" #include "mozilla/gfx/2D.h" #include "mozilla/gfx/PathHelpers.h" #include "nsGkAtoms.h" #include "nsILanguageAtomService.h" #include "nsServiceManagerUtils.h" #include "gfxContext.h" #include "gfxFontConstants.h" #include "gfxFontMissingGlyphs.h" #include "gfxScriptItemizer.h" #include "nsUnicodeProperties.h" #include "nsUnicodeRange.h" #include "nsStyleConsts.h" #include "mozilla/Likely.h" #include "gfx2DGlue.h" #include "cairo.h" using namespace mozilla; using namespace mozilla::gfx; using namespace mozilla::unicode; using mozilla::services::GetObserverService; static const char16_t kEllipsisChar[] = { 0x2026, 0x0 }; static const char16_t kASCIIPeriodsChar[] = { '.', '.', '.', 0x0 }; #ifdef DEBUG_roc #define DEBUG_TEXT_RUN_STORAGE_METRICS #endif #ifdef DEBUG_TEXT_RUN_STORAGE_METRICS extern uint32_t gTextRunStorageHighWaterMark; extern uint32_t gTextRunStorage; extern uint32_t gFontCount; extern uint32_t gGlyphExtentsCount; extern uint32_t gGlyphExtentsWidthsTotalSize; extern uint32_t gGlyphExtentsSetupEagerSimple; extern uint32_t gGlyphExtentsSetupEagerTight; extern uint32_t gGlyphExtentsSetupLazyTight; extern uint32_t gGlyphExtentsSetupFallBackToTight; #endif bool gfxTextRun::GlyphRunIterator::NextRun() { if (mNextIndex >= mTextRun->mGlyphRuns.Length()) return false; mGlyphRun = &mTextRun->mGlyphRuns[mNextIndex]; if (mGlyphRun->mCharacterOffset >= mEndOffset) return false; mStringStart = std::max(mStartOffset, mGlyphRun->mCharacterOffset); uint32_t last = mNextIndex + 1 < mTextRun->mGlyphRuns.Length() ? mTextRun->mGlyphRuns[mNextIndex + 1].mCharacterOffset : mTextRun->GetLength(); mStringEnd = std::min(mEndOffset, last); ++mNextIndex; return true; } #ifdef DEBUG_TEXT_RUN_STORAGE_METRICS static void AccountStorageForTextRun(gfxTextRun *aTextRun, int32_t aSign) { // Ignores detailed glyphs... we don't know when those have been constructed // Also ignores gfxSkipChars dynamic storage (which won't be anything // for preformatted text) // Also ignores GlyphRun array, again because it hasn't been constructed // by the time this gets called. If there's only one glyphrun that's stored // directly in the textrun anyway so no additional overhead. uint32_t length = aTextRun->GetLength(); int32_t bytes = length * sizeof(gfxTextRun::CompressedGlyph); bytes += sizeof(gfxTextRun); gTextRunStorage += bytes*aSign; gTextRunStorageHighWaterMark = std::max(gTextRunStorageHighWaterMark, gTextRunStorage); } #endif static bool NeedsGlyphExtents(gfxTextRun *aTextRun) { if (aTextRun->GetFlags() & gfxTextRunFactory::TEXT_NEED_BOUNDING_BOX) return true; uint32_t numRuns; const gfxTextRun::GlyphRun *glyphRuns = aTextRun->GetGlyphRuns(&numRuns); for (uint32_t i = 0; i < numRuns; ++i) { if (glyphRuns[i].mFont->GetFontEntry()->IsUserFont()) return true; } return false; } // Helper for textRun creation to preallocate storage for glyph records; // this function returns a pointer to the newly-allocated glyph storage. // Returns nullptr if allocation fails. void * gfxTextRun::AllocateStorageForTextRun(size_t aSize, uint32_t aLength) { // Allocate the storage we need, returning nullptr on failure rather than // throwing an exception (because web content can create huge runs). void *storage = moz_malloc(aSize + aLength * sizeof(CompressedGlyph)); if (!storage) { NS_WARNING("failed to allocate storage for text run!"); return nullptr; } // Initialize the glyph storage (beyond aSize) to zero memset(reinterpret_cast(storage) + aSize, 0, aLength * sizeof(CompressedGlyph)); return storage; } gfxTextRun * gfxTextRun::Create(const gfxTextRunFactory::Parameters *aParams, uint32_t aLength, gfxFontGroup *aFontGroup, uint32_t aFlags) { void *storage = AllocateStorageForTextRun(sizeof(gfxTextRun), aLength); if (!storage) { return nullptr; } return new (storage) gfxTextRun(aParams, aLength, aFontGroup, aFlags); } gfxTextRun::gfxTextRun(const gfxTextRunFactory::Parameters *aParams, uint32_t aLength, gfxFontGroup *aFontGroup, uint32_t aFlags) : gfxShapedText(aLength, aFlags, aParams->mAppUnitsPerDevUnit) , mUserData(aParams->mUserData) , mFontGroup(aFontGroup) , mReleasedFontGroup(false) , mShapingState(eShapingState_Normal) { NS_ASSERTION(mAppUnitsPerDevUnit > 0, "Invalid app unit scale"); MOZ_COUNT_CTOR(gfxTextRun); NS_ADDREF(mFontGroup); #ifndef RELEASE_BUILD gfxTextPerfMetrics *tp = aFontGroup->GetTextPerfMetrics(); if (tp) { tp->current.textrunConst++; } #endif mCharacterGlyphs = reinterpret_cast(this + 1); if (aParams->mSkipChars) { mSkipChars.TakeFrom(aParams->mSkipChars); } #ifdef DEBUG_TEXT_RUN_STORAGE_METRICS AccountStorageForTextRun(this, 1); #endif mSkipDrawing = mFontGroup->ShouldSkipDrawing(); } gfxTextRun::~gfxTextRun() { #ifdef DEBUG_TEXT_RUN_STORAGE_METRICS AccountStorageForTextRun(this, -1); #endif #ifdef DEBUG // Make it easy to detect a dead text run mFlags = 0xFFFFFFFF; #endif // The cached ellipsis textrun (if any) in a fontgroup will have already // been told to release its reference to the group, so we mustn't do that // again here. if (!mReleasedFontGroup) { #ifndef RELEASE_BUILD gfxTextPerfMetrics *tp = mFontGroup->GetTextPerfMetrics(); if (tp) { tp->current.textrunDestr++; } #endif NS_RELEASE(mFontGroup); } MOZ_COUNT_DTOR(gfxTextRun); } void gfxTextRun::ReleaseFontGroup() { NS_ASSERTION(!mReleasedFontGroup, "doubly released!"); NS_RELEASE(mFontGroup); mReleasedFontGroup = true; } bool gfxTextRun::SetPotentialLineBreaks(uint32_t aStart, uint32_t aLength, uint8_t *aBreakBefore, gfxContext *aRefContext) { NS_ASSERTION(aStart + aLength <= GetLength(), "Overflow"); uint32_t changed = 0; uint32_t i; CompressedGlyph *charGlyphs = mCharacterGlyphs + aStart; for (i = 0; i < aLength; ++i) { uint8_t canBreak = aBreakBefore[i]; if (canBreak && !charGlyphs[i].IsClusterStart()) { // This can happen ... there is no guarantee that our linebreaking rules // align with the platform's idea of what constitutes a cluster. NS_WARNING("Break suggested inside cluster!"); canBreak = CompressedGlyph::FLAG_BREAK_TYPE_NONE; } changed |= charGlyphs[i].SetCanBreakBefore(canBreak); } return changed != 0; } gfxTextRun::LigatureData gfxTextRun::ComputeLigatureData(uint32_t aPartStart, uint32_t aPartEnd, PropertyProvider *aProvider) { NS_ASSERTION(aPartStart < aPartEnd, "Computing ligature data for empty range"); NS_ASSERTION(aPartEnd <= GetLength(), "Character length overflow"); LigatureData result; CompressedGlyph *charGlyphs = mCharacterGlyphs; uint32_t i; for (i = aPartStart; !charGlyphs[i].IsLigatureGroupStart(); --i) { NS_ASSERTION(i > 0, "Ligature at the start of the run??"); } result.mLigatureStart = i; for (i = aPartStart + 1; i < GetLength() && !charGlyphs[i].IsLigatureGroupStart(); ++i) { } result.mLigatureEnd = i; int32_t ligatureWidth = GetAdvanceForGlyphs(result.mLigatureStart, result.mLigatureEnd); // Count the number of started clusters we have seen uint32_t totalClusterCount = 0; uint32_t partClusterIndex = 0; uint32_t partClusterCount = 0; for (i = result.mLigatureStart; i < result.mLigatureEnd; ++i) { // Treat the first character of the ligature as the start of a // cluster for our purposes of allocating ligature width to its // characters. if (i == result.mLigatureStart || charGlyphs[i].IsClusterStart()) { ++totalClusterCount; if (i < aPartStart) { ++partClusterIndex; } else if (i < aPartEnd) { ++partClusterCount; } } } NS_ASSERTION(totalClusterCount > 0, "Ligature involving no clusters??"); result.mPartAdvance = partClusterIndex * (ligatureWidth / totalClusterCount); result.mPartWidth = partClusterCount * (ligatureWidth / totalClusterCount); // Any rounding errors are apportioned to the final part of the ligature, // so that measuring all parts of a ligature and summing them is equal to // the ligature width. if (aPartEnd == result.mLigatureEnd) { gfxFloat allParts = totalClusterCount * (ligatureWidth / totalClusterCount); result.mPartWidth += ligatureWidth - allParts; } if (partClusterCount == 0) { // nothing to draw result.mClipBeforePart = result.mClipAfterPart = true; } else { // Determine whether we should clip before or after this part when // drawing its slice of the ligature. // We need to clip before the part if any cluster is drawn before // this part. result.mClipBeforePart = partClusterIndex > 0; // We need to clip after the part if any cluster is drawn after // this part. result.mClipAfterPart = partClusterIndex + partClusterCount < totalClusterCount; } if (aProvider && (mFlags & gfxTextRunFactory::TEXT_ENABLE_SPACING)) { gfxFont::Spacing spacing; if (aPartStart == result.mLigatureStart) { aProvider->GetSpacing(aPartStart, 1, &spacing); result.mPartWidth += spacing.mBefore; } if (aPartEnd == result.mLigatureEnd) { aProvider->GetSpacing(aPartEnd - 1, 1, &spacing); result.mPartWidth += spacing.mAfter; } } return result; } gfxFloat gfxTextRun::ComputePartialLigatureWidth(uint32_t aPartStart, uint32_t aPartEnd, PropertyProvider *aProvider) { if (aPartStart >= aPartEnd) return 0; LigatureData data = ComputeLigatureData(aPartStart, aPartEnd, aProvider); return data.mPartWidth; } int32_t gfxTextRun::GetAdvanceForGlyphs(uint32_t aStart, uint32_t aEnd) { const CompressedGlyph *glyphData = mCharacterGlyphs + aStart; int32_t advance = 0; uint32_t i; for (i = aStart; i < aEnd; ++i, ++glyphData) { if (glyphData->IsSimpleGlyph()) { advance += glyphData->GetSimpleAdvance(); } else { uint32_t glyphCount = glyphData->GetGlyphCount(); if (glyphCount == 0) { continue; } const DetailedGlyph *details = GetDetailedGlyphs(i); if (details) { uint32_t j; for (j = 0; j < glyphCount; ++j, ++details) { advance += details->mAdvance; } } } } return advance; } static void GetAdjustedSpacing(gfxTextRun *aTextRun, uint32_t aStart, uint32_t aEnd, gfxTextRun::PropertyProvider *aProvider, gfxTextRun::PropertyProvider::Spacing *aSpacing) { if (aStart >= aEnd) return; aProvider->GetSpacing(aStart, aEnd - aStart, aSpacing); #ifdef DEBUG // Check to see if we have spacing inside ligatures const gfxTextRun::CompressedGlyph *charGlyphs = aTextRun->GetCharacterGlyphs(); uint32_t i; for (i = aStart; i < aEnd; ++i) { if (!charGlyphs[i].IsLigatureGroupStart()) { NS_ASSERTION(i == aStart || aSpacing[i - aStart].mBefore == 0, "Before-spacing inside a ligature!"); NS_ASSERTION(i - 1 <= aStart || aSpacing[i - 1 - aStart].mAfter == 0, "After-spacing inside a ligature!"); } } #endif } bool gfxTextRun::GetAdjustedSpacingArray(uint32_t aStart, uint32_t aEnd, PropertyProvider *aProvider, uint32_t aSpacingStart, uint32_t aSpacingEnd, nsTArray *aSpacing) { if (!aProvider || !(mFlags & gfxTextRunFactory::TEXT_ENABLE_SPACING)) return false; if (!aSpacing->AppendElements(aEnd - aStart)) return false; memset(aSpacing->Elements(), 0, sizeof(gfxFont::Spacing)*(aSpacingStart - aStart)); GetAdjustedSpacing(this, aSpacingStart, aSpacingEnd, aProvider, aSpacing->Elements() + aSpacingStart - aStart); memset(aSpacing->Elements() + aSpacingEnd - aStart, 0, sizeof(gfxFont::Spacing)*(aEnd - aSpacingEnd)); return true; } void gfxTextRun::ShrinkToLigatureBoundaries(uint32_t *aStart, uint32_t *aEnd) { if (*aStart >= *aEnd) return; CompressedGlyph *charGlyphs = mCharacterGlyphs; while (*aStart < *aEnd && !charGlyphs[*aStart].IsLigatureGroupStart()) { ++(*aStart); } if (*aEnd < GetLength()) { while (*aEnd > *aStart && !charGlyphs[*aEnd].IsLigatureGroupStart()) { --(*aEnd); } } } void gfxTextRun::DrawGlyphs(gfxFont *aFont, uint32_t aStart, uint32_t aEnd, gfxPoint *aPt, PropertyProvider *aProvider, uint32_t aSpacingStart, uint32_t aSpacingEnd, TextRunDrawParams& aParams, uint16_t aOrientation) { nsAutoTArray spacingBuffer; bool haveSpacing = GetAdjustedSpacingArray(aStart, aEnd, aProvider, aSpacingStart, aSpacingEnd, &spacingBuffer); aParams.spacing = haveSpacing ? spacingBuffer.Elements() : nullptr; aFont->Draw(this, aStart, aEnd, aPt, aParams, aOrientation); } static void ClipPartialLigature(const gfxTextRun* aTextRun, gfxFloat *aStart, gfxFloat *aEnd, gfxFloat aOrigin, gfxTextRun::LigatureData *aLigature) { if (aLigature->mClipBeforePart) { if (aTextRun->IsRightToLeft()) { *aEnd = std::min(*aEnd, aOrigin); } else { *aStart = std::max(*aStart, aOrigin); } } if (aLigature->mClipAfterPart) { gfxFloat endEdge = aOrigin + aTextRun->GetDirection() * aLigature->mPartWidth; if (aTextRun->IsRightToLeft()) { *aStart = std::max(*aStart, endEdge); } else { *aEnd = std::min(*aEnd, endEdge); } } } void gfxTextRun::DrawPartialLigature(gfxFont *aFont, uint32_t aStart, uint32_t aEnd, gfxPoint *aPt, PropertyProvider *aProvider, TextRunDrawParams& aParams, uint16_t aOrientation) { if (aStart >= aEnd) { return; } // Draw partial ligature. We hack this by clipping the ligature. LigatureData data = ComputeLigatureData(aStart, aEnd, aProvider); gfxRect clipExtents = aParams.context->GetClipExtents(); gfxFloat start, end; if (aParams.isVerticalRun) { start = clipExtents.Y() * mAppUnitsPerDevUnit; end = clipExtents.YMost() * mAppUnitsPerDevUnit; ClipPartialLigature(this, &start, &end, aPt->y, &data); } else { start = clipExtents.X() * mAppUnitsPerDevUnit; end = clipExtents.XMost() * mAppUnitsPerDevUnit; ClipPartialLigature(this, &start, &end, aPt->x, &data); } { // use division here to ensure that when the rect is aligned on multiples // of mAppUnitsPerDevUnit, we clip to true device unit boundaries. // Also, make sure we snap the rectangle to device pixels. Rect clipRect = aParams.isVerticalRun ? Rect(clipExtents.X(), start / mAppUnitsPerDevUnit, clipExtents.Width(), (end - start) / mAppUnitsPerDevUnit) : Rect(start / mAppUnitsPerDevUnit, clipExtents.Y(), (end - start) / mAppUnitsPerDevUnit, clipExtents.Height()); MaybeSnapToDevicePixels(clipRect, *aParams.dt, true); aParams.context->Save(); aParams.context->Clip(clipRect); } gfxPoint pt; if (aParams.isVerticalRun) { pt = gfxPoint(aPt->x, aPt->y - aParams.direction * data.mPartAdvance); } else { pt = gfxPoint(aPt->x - aParams.direction * data.mPartAdvance, aPt->y); } DrawGlyphs(aFont, data.mLigatureStart, data.mLigatureEnd, &pt, aProvider, aStart, aEnd, aParams, aOrientation); aParams.context->Restore(); if (aParams.isVerticalRun) { aPt->y += aParams.direction * data.mPartWidth; } else { aPt->x += aParams.direction * data.mPartWidth; } } // returns true if a glyph run is using a font with synthetic bolding enabled, false otherwise static bool HasSyntheticBold(gfxTextRun *aRun, uint32_t aStart, uint32_t aLength) { gfxTextRun::GlyphRunIterator iter(aRun, aStart, aLength); while (iter.NextRun()) { gfxFont *font = iter.GetGlyphRun()->mFont; if (font && font->IsSyntheticBold()) { return true; } } return false; } // returns true if color is non-opaque (i.e. alpha != 1.0) or completely transparent, false otherwise // if true, color is set on output static bool HasNonOpaqueColor(gfxContext *aContext, gfxRGBA& aCurrentColor) { if (aContext->GetDeviceColor(aCurrentColor)) { if (aCurrentColor.a < 1.0 && aCurrentColor.a > 0.0) { return true; } } return false; } // helper class for double-buffering drawing with non-opaque color struct BufferAlphaColor { explicit BufferAlphaColor(gfxContext *aContext) : mContext(aContext) { } ~BufferAlphaColor() {} void PushSolidColor(const gfxRect& aBounds, const gfxRGBA& aAlphaColor, uint32_t appsPerDevUnit) { mContext->Save(); mContext->NewPath(); mContext->Rectangle(gfxRect(aBounds.X() / appsPerDevUnit, aBounds.Y() / appsPerDevUnit, aBounds.Width() / appsPerDevUnit, aBounds.Height() / appsPerDevUnit), true); mContext->Clip(); mContext->SetColor(gfxRGBA(aAlphaColor.r, aAlphaColor.g, aAlphaColor.b)); mContext->PushGroup(gfxContentType::COLOR_ALPHA); mAlpha = aAlphaColor.a; } void PopAlpha() { // pop the text, using the color alpha as the opacity mContext->PopGroupToSource(); mContext->SetOperator(gfxContext::OPERATOR_OVER); mContext->Paint(mAlpha); mContext->Restore(); } gfxContext *mContext; gfxFloat mAlpha; }; void gfxTextRun::Draw(gfxContext *aContext, gfxPoint aPt, DrawMode aDrawMode, uint32_t aStart, uint32_t aLength, PropertyProvider *aProvider, gfxFloat *aAdvanceWidth, gfxTextContextPaint *aContextPaint, gfxTextRunDrawCallbacks *aCallbacks) { NS_ASSERTION(aStart + aLength <= GetLength(), "Substring out of range"); NS_ASSERTION(aDrawMode == DrawMode::GLYPH_PATH || !(int(aDrawMode) & int(DrawMode::GLYPH_PATH)), "GLYPH_PATH cannot be used with GLYPH_FILL, GLYPH_STROKE or GLYPH_STROKE_UNDERNEATH"); NS_ASSERTION(aDrawMode == DrawMode::GLYPH_PATH || !aCallbacks, "callback must not be specified unless using GLYPH_PATH"); bool skipDrawing = mSkipDrawing; if (aDrawMode == DrawMode::GLYPH_FILL) { gfxRGBA currentColor; if (aContext->GetDeviceColor(currentColor) && currentColor.a == 0) { skipDrawing = true; } } gfxFloat direction = GetDirection(); if (skipDrawing) { // We don't need to draw anything; // but if the caller wants advance width, we need to compute it here if (aAdvanceWidth) { gfxTextRun::Metrics metrics = MeasureText(aStart, aLength, gfxFont::LOOSE_INK_EXTENTS, aContext, aProvider); *aAdvanceWidth = metrics.mAdvanceWidth * direction; } // return without drawing return; } // Set up parameters that will be constant across all glyph runs we need // to draw, regardless of the font used. TextRunDrawParams params; params.context = aContext; params.devPerApp = 1.0 / double(GetAppUnitsPerDevUnit()); params.isVerticalRun = IsVertical(); params.isRTL = IsRightToLeft(); params.direction = direction; params.drawMode = aDrawMode; params.callbacks = aCallbacks; params.runContextPaint = aContextPaint; params.paintSVGGlyphs = !aCallbacks || aCallbacks->mShouldPaintSVGGlyphs; params.dt = aContext->GetDrawTarget(); params.fontSmoothingBGColor = aContext->GetFontSmoothingBackgroundColor(); // synthetic bolding draws glyphs twice ==> colors with opacity won't draw // correctly unless first drawn without alpha BufferAlphaColor syntheticBoldBuffer(aContext); gfxRGBA currentColor; bool needToRestore = false; if (aDrawMode == DrawMode::GLYPH_FILL && HasNonOpaqueColor(aContext, currentColor) && HasSyntheticBold(this, aStart, aLength)) { needToRestore = true; // measure text, use the bounding box gfxTextRun::Metrics metrics = MeasureText(aStart, aLength, gfxFont::LOOSE_INK_EXTENTS, aContext, aProvider); metrics.mBoundingBox.MoveBy(aPt); syntheticBoldBuffer.PushSolidColor(metrics.mBoundingBox, currentColor, GetAppUnitsPerDevUnit()); } GlyphRunIterator iter(this, aStart, aLength); gfxFloat advance = 0.0; while (iter.NextRun()) { gfxFont *font = iter.GetGlyphRun()->mFont; uint32_t start = iter.GetStringStart(); uint32_t end = iter.GetStringEnd(); uint32_t ligatureRunStart = start; uint32_t ligatureRunEnd = end; ShrinkToLigatureBoundaries(&ligatureRunStart, &ligatureRunEnd); bool drawPartial = aDrawMode == DrawMode::GLYPH_FILL || (aDrawMode == DrawMode::GLYPH_PATH && aCallbacks); gfxPoint origPt = aPt; if (drawPartial) { DrawPartialLigature(font, start, ligatureRunStart, &aPt, aProvider, params, iter.GetGlyphRun()->mOrientation); } DrawGlyphs(font, ligatureRunStart, ligatureRunEnd, &aPt, aProvider, ligatureRunStart, ligatureRunEnd, params, iter.GetGlyphRun()->mOrientation); if (drawPartial) { DrawPartialLigature(font, ligatureRunEnd, end, &aPt, aProvider, params, iter.GetGlyphRun()->mOrientation); } if (params.isVerticalRun) { advance += (aPt.y - origPt.y) * params.direction; } else { advance += (aPt.x - origPt.x) * params.direction; } } // composite result when synthetic bolding used if (needToRestore) { syntheticBoldBuffer.PopAlpha(); } if (aAdvanceWidth) { *aAdvanceWidth = advance; } } void gfxTextRun::AccumulateMetricsForRun(gfxFont *aFont, uint32_t aStart, uint32_t aEnd, gfxFont::BoundingBoxType aBoundingBoxType, gfxContext *aRefContext, PropertyProvider *aProvider, uint32_t aSpacingStart, uint32_t aSpacingEnd, uint16_t aOrientation, Metrics *aMetrics) { nsAutoTArray spacingBuffer; bool haveSpacing = GetAdjustedSpacingArray(aStart, aEnd, aProvider, aSpacingStart, aSpacingEnd, &spacingBuffer); Metrics metrics = aFont->Measure(this, aStart, aEnd, aBoundingBoxType, aRefContext, haveSpacing ? spacingBuffer.Elements() : nullptr, aOrientation); aMetrics->CombineWith(metrics, IsRightToLeft()); } void gfxTextRun::AccumulatePartialLigatureMetrics(gfxFont *aFont, uint32_t aStart, uint32_t aEnd, gfxFont::BoundingBoxType aBoundingBoxType, gfxContext *aRefContext, PropertyProvider *aProvider, uint16_t aOrientation, Metrics *aMetrics) { if (aStart >= aEnd) return; // Measure partial ligature. We hack this by clipping the metrics in the // same way we clip the drawing. LigatureData data = ComputeLigatureData(aStart, aEnd, aProvider); // First measure the complete ligature Metrics metrics; AccumulateMetricsForRun(aFont, data.mLigatureStart, data.mLigatureEnd, aBoundingBoxType, aRefContext, aProvider, aStart, aEnd, aOrientation, &metrics); // Clip the bounding box to the ligature part gfxFloat bboxLeft = metrics.mBoundingBox.X(); gfxFloat bboxRight = metrics.mBoundingBox.XMost(); // Where we are going to start "drawing" relative to our left baseline origin gfxFloat origin = IsRightToLeft() ? metrics.mAdvanceWidth - data.mPartAdvance : 0; ClipPartialLigature(this, &bboxLeft, &bboxRight, origin, &data); metrics.mBoundingBox.x = bboxLeft; metrics.mBoundingBox.width = bboxRight - bboxLeft; // mBoundingBox is now relative to the left baseline origin for the entire // ligature. Shift it left. metrics.mBoundingBox.x -= IsRightToLeft() ? metrics.mAdvanceWidth - (data.mPartAdvance + data.mPartWidth) : data.mPartAdvance; metrics.mAdvanceWidth = data.mPartWidth; aMetrics->CombineWith(metrics, IsRightToLeft()); } gfxTextRun::Metrics gfxTextRun::MeasureText(uint32_t aStart, uint32_t aLength, gfxFont::BoundingBoxType aBoundingBoxType, gfxContext *aRefContext, PropertyProvider *aProvider) { NS_ASSERTION(aStart + aLength <= GetLength(), "Substring out of range"); Metrics accumulatedMetrics; GlyphRunIterator iter(this, aStart, aLength); while (iter.NextRun()) { gfxFont *font = iter.GetGlyphRun()->mFont; uint32_t start = iter.GetStringStart(); uint32_t end = iter.GetStringEnd(); uint32_t ligatureRunStart = start; uint32_t ligatureRunEnd = end; ShrinkToLigatureBoundaries(&ligatureRunStart, &ligatureRunEnd); AccumulatePartialLigatureMetrics(font, start, ligatureRunStart, aBoundingBoxType, aRefContext, aProvider, iter.GetGlyphRun()->mOrientation, &accumulatedMetrics); // XXX This sucks. We have to get glyph extents just so we can detect // glyphs outside the font box, even when aBoundingBoxType is LOOSE, // even though in almost all cases we could get correct results just // by getting some ascent/descent from the font and using our stored // advance widths. AccumulateMetricsForRun(font, ligatureRunStart, ligatureRunEnd, aBoundingBoxType, aRefContext, aProvider, ligatureRunStart, ligatureRunEnd, iter.GetGlyphRun()->mOrientation, &accumulatedMetrics); AccumulatePartialLigatureMetrics(font, ligatureRunEnd, end, aBoundingBoxType, aRefContext, aProvider, iter.GetGlyphRun()->mOrientation, &accumulatedMetrics); } return accumulatedMetrics; } #define MEASUREMENT_BUFFER_SIZE 100 uint32_t gfxTextRun::BreakAndMeasureText(uint32_t aStart, uint32_t aMaxLength, bool aLineBreakBefore, gfxFloat aWidth, PropertyProvider *aProvider, SuppressBreak aSuppressBreak, gfxFloat *aTrimWhitespace, Metrics *aMetrics, gfxFont::BoundingBoxType aBoundingBoxType, gfxContext *aRefContext, bool *aUsedHyphenation, uint32_t *aLastBreak, bool aCanWordWrap, gfxBreakPriority *aBreakPriority) { aMaxLength = std::min(aMaxLength, GetLength() - aStart); NS_ASSERTION(aStart + aMaxLength <= GetLength(), "Substring out of range"); uint32_t bufferStart = aStart; uint32_t bufferLength = std::min(aMaxLength, MEASUREMENT_BUFFER_SIZE); PropertyProvider::Spacing spacingBuffer[MEASUREMENT_BUFFER_SIZE]; bool haveSpacing = aProvider && (mFlags & gfxTextRunFactory::TEXT_ENABLE_SPACING) != 0; if (haveSpacing) { GetAdjustedSpacing(this, bufferStart, bufferStart + bufferLength, aProvider, spacingBuffer); } bool hyphenBuffer[MEASUREMENT_BUFFER_SIZE]; bool haveHyphenation = aProvider && (aProvider->GetHyphensOption() == NS_STYLE_HYPHENS_AUTO || (aProvider->GetHyphensOption() == NS_STYLE_HYPHENS_MANUAL && (mFlags & gfxTextRunFactory::TEXT_ENABLE_HYPHEN_BREAKS) != 0)); if (haveHyphenation) { aProvider->GetHyphenationBreaks(bufferStart, bufferLength, hyphenBuffer); } gfxFloat width = 0; gfxFloat advance = 0; // The number of space characters that can be trimmed uint32_t trimmableChars = 0; // The amount of space removed by ignoring trimmableChars gfxFloat trimmableAdvance = 0; int32_t lastBreak = -1; int32_t lastBreakTrimmableChars = -1; gfxFloat lastBreakTrimmableAdvance = -1; bool aborted = false; uint32_t end = aStart + aMaxLength; bool lastBreakUsedHyphenation = false; uint32_t ligatureRunStart = aStart; uint32_t ligatureRunEnd = end; ShrinkToLigatureBoundaries(&ligatureRunStart, &ligatureRunEnd); uint32_t i; for (i = aStart; i < end; ++i) { if (i >= bufferStart + bufferLength) { // Fetch more spacing and hyphenation data bufferStart = i; bufferLength = std::min(aStart + aMaxLength, i + MEASUREMENT_BUFFER_SIZE) - i; if (haveSpacing) { GetAdjustedSpacing(this, bufferStart, bufferStart + bufferLength, aProvider, spacingBuffer); } if (haveHyphenation) { aProvider->GetHyphenationBreaks(bufferStart, bufferLength, hyphenBuffer); } } // There can't be a word-wrap break opportunity at the beginning of the // line: if the width is too small for even one character to fit, it // could be the first and last break opportunity on the line, and that // would trigger an infinite loop. if (aSuppressBreak != eSuppressAllBreaks && (aSuppressBreak != eSuppressInitialBreak || i > aStart)) { bool atNaturalBreak = mCharacterGlyphs[i].CanBreakBefore() == 1; bool atHyphenationBreak = !atNaturalBreak && haveHyphenation && hyphenBuffer[i - bufferStart]; bool atBreak = atNaturalBreak || atHyphenationBreak; bool wordWrapping = aCanWordWrap && mCharacterGlyphs[i].IsClusterStart() && *aBreakPriority <= gfxBreakPriority::eWordWrapBreak; if (atBreak || wordWrapping) { gfxFloat hyphenatedAdvance = advance; if (atHyphenationBreak) { hyphenatedAdvance += aProvider->GetHyphenWidth(); } if (lastBreak < 0 || width + hyphenatedAdvance - trimmableAdvance <= aWidth) { // We can break here. lastBreak = i; lastBreakTrimmableChars = trimmableChars; lastBreakTrimmableAdvance = trimmableAdvance; lastBreakUsedHyphenation = atHyphenationBreak; *aBreakPriority = atBreak ? gfxBreakPriority::eNormalBreak : gfxBreakPriority::eWordWrapBreak; } width += advance; advance = 0; if (width - trimmableAdvance > aWidth) { // No more text fits. Abort aborted = true; break; } } } gfxFloat charAdvance; if (i >= ligatureRunStart && i < ligatureRunEnd) { charAdvance = GetAdvanceForGlyphs(i, i + 1); if (haveSpacing) { PropertyProvider::Spacing *space = &spacingBuffer[i - bufferStart]; charAdvance += space->mBefore + space->mAfter; } } else { charAdvance = ComputePartialLigatureWidth(i, i + 1, aProvider); } advance += charAdvance; if (aTrimWhitespace) { if (mCharacterGlyphs[i].CharIsSpace()) { ++trimmableChars; trimmableAdvance += charAdvance; } else { trimmableAdvance = 0; trimmableChars = 0; } } } if (!aborted) { width += advance; } // There are three possibilities: // 1) all the text fit (width <= aWidth) // 2) some of the text fit up to a break opportunity (width > aWidth && lastBreak >= 0) // 3) none of the text fits before a break opportunity (width > aWidth && lastBreak < 0) uint32_t charsFit; bool usedHyphenation = false; if (width - trimmableAdvance <= aWidth) { charsFit = aMaxLength; } else if (lastBreak >= 0) { charsFit = lastBreak - aStart; trimmableChars = lastBreakTrimmableChars; trimmableAdvance = lastBreakTrimmableAdvance; usedHyphenation = lastBreakUsedHyphenation; } else { charsFit = aMaxLength; } if (aMetrics) { *aMetrics = MeasureText(aStart, charsFit - trimmableChars, aBoundingBoxType, aRefContext, aProvider); } if (aTrimWhitespace) { *aTrimWhitespace = trimmableAdvance; } if (aUsedHyphenation) { *aUsedHyphenation = usedHyphenation; } if (aLastBreak && charsFit == aMaxLength) { if (lastBreak < 0) { *aLastBreak = UINT32_MAX; } else { *aLastBreak = lastBreak - aStart; } } return charsFit; } gfxFloat gfxTextRun::GetAdvanceWidth(uint32_t aStart, uint32_t aLength, PropertyProvider *aProvider, PropertyProvider::Spacing* aSpacing) { NS_ASSERTION(aStart + aLength <= GetLength(), "Substring out of range"); uint32_t ligatureRunStart = aStart; uint32_t ligatureRunEnd = aStart + aLength; ShrinkToLigatureBoundaries(&ligatureRunStart, &ligatureRunEnd); gfxFloat result = ComputePartialLigatureWidth(aStart, ligatureRunStart, aProvider) + ComputePartialLigatureWidth(ligatureRunEnd, aStart + aLength, aProvider); if (aSpacing) { aSpacing->mBefore = aSpacing->mAfter = 0; } // Account for all remaining spacing here. This is more efficient than // processing it along with the glyphs. if (aProvider && (mFlags & gfxTextRunFactory::TEXT_ENABLE_SPACING)) { uint32_t i; nsAutoTArray spacingBuffer; if (spacingBuffer.AppendElements(aLength)) { GetAdjustedSpacing(this, ligatureRunStart, ligatureRunEnd, aProvider, spacingBuffer.Elements()); for (i = 0; i < ligatureRunEnd - ligatureRunStart; ++i) { PropertyProvider::Spacing *space = &spacingBuffer[i]; result += space->mBefore + space->mAfter; } if (aSpacing) { aSpacing->mBefore = spacingBuffer[0].mBefore; aSpacing->mAfter = spacingBuffer.LastElement().mAfter; } } } return result + GetAdvanceForGlyphs(ligatureRunStart, ligatureRunEnd); } bool gfxTextRun::SetLineBreaks(uint32_t aStart, uint32_t aLength, bool aLineBreakBefore, bool aLineBreakAfter, gfxFloat *aAdvanceWidthDelta, gfxContext *aRefContext) { // Do nothing because our shaping does not currently take linebreaks into // account. There is no change in advance width. if (aAdvanceWidthDelta) { *aAdvanceWidthDelta = 0; } return false; } uint32_t gfxTextRun::FindFirstGlyphRunContaining(uint32_t aOffset) { NS_ASSERTION(aOffset <= GetLength(), "Bad offset looking for glyphrun"); NS_ASSERTION(GetLength() == 0 || mGlyphRuns.Length() > 0, "non-empty text but no glyph runs present!"); if (aOffset == GetLength()) return mGlyphRuns.Length(); uint32_t start = 0; uint32_t end = mGlyphRuns.Length(); while (end - start > 1) { uint32_t mid = (start + end)/2; if (mGlyphRuns[mid].mCharacterOffset <= aOffset) { start = mid; } else { end = mid; } } NS_ASSERTION(mGlyphRuns[start].mCharacterOffset <= aOffset, "Hmm, something went wrong, aOffset should have been found"); return start; } nsresult gfxTextRun::AddGlyphRun(gfxFont *aFont, uint8_t aMatchType, uint32_t aUTF16Offset, bool aForceNewRun, uint16_t aOrientation) { NS_ASSERTION(aFont, "adding glyph run for null font!"); NS_ASSERTION(aOrientation != gfxTextRunFactory::TEXT_ORIENT_VERTICAL_MIXED, "mixed orientation should have been resolved"); if (!aFont) { return NS_OK; } uint32_t numGlyphRuns = mGlyphRuns.Length(); if (!aForceNewRun && numGlyphRuns > 0) { GlyphRun *lastGlyphRun = &mGlyphRuns[numGlyphRuns - 1]; NS_ASSERTION(lastGlyphRun->mCharacterOffset <= aUTF16Offset, "Glyph runs out of order (and run not forced)"); // Don't append a run if the font is already the one we want if (lastGlyphRun->mFont == aFont && lastGlyphRun->mMatchType == aMatchType && lastGlyphRun->mOrientation == aOrientation) { return NS_OK; } // If the offset has not changed, avoid leaving a zero-length run // by overwriting the last entry instead of appending... if (lastGlyphRun->mCharacterOffset == aUTF16Offset) { // ...except that if the run before the last entry had the same // font as the new one wants, merge with it instead of creating // adjacent runs with the same font if (numGlyphRuns > 1 && mGlyphRuns[numGlyphRuns - 2].mFont == aFont && mGlyphRuns[numGlyphRuns - 2].mMatchType == aMatchType && mGlyphRuns[numGlyphRuns - 2].mOrientation == aOrientation) { mGlyphRuns.TruncateLength(numGlyphRuns - 1); return NS_OK; } lastGlyphRun->mFont = aFont; lastGlyphRun->mMatchType = aMatchType; lastGlyphRun->mOrientation = aOrientation; return NS_OK; } } NS_ASSERTION(aForceNewRun || numGlyphRuns > 0 || aUTF16Offset == 0, "First run doesn't cover the first character (and run not forced)?"); GlyphRun *glyphRun = mGlyphRuns.AppendElement(); if (!glyphRun) return NS_ERROR_OUT_OF_MEMORY; glyphRun->mFont = aFont; glyphRun->mCharacterOffset = aUTF16Offset; glyphRun->mMatchType = aMatchType; glyphRun->mOrientation = aOrientation; return NS_OK; } void gfxTextRun::SortGlyphRuns() { if (mGlyphRuns.Length() <= 1) return; nsTArray runs(mGlyphRuns); GlyphRunOffsetComparator comp; runs.Sort(comp); // Now copy back, coalescing adjacent glyph runs that have the same font mGlyphRuns.Clear(); uint32_t i, count = runs.Length(); for (i = 0; i < count; ++i) { // a GlyphRun with the same font and orientation as the previous can // just be skipped; the last GlyphRun will cover its character range. if (i == 0 || runs[i].mFont != runs[i - 1].mFont || runs[i].mOrientation != runs[i - 1].mOrientation) { mGlyphRuns.AppendElement(runs[i]); // If two fonts have the same character offset, Sort() will have // randomized the order. NS_ASSERTION(i == 0 || runs[i].mCharacterOffset != runs[i - 1].mCharacterOffset, "Two fonts for the same run, glyph indices may not match the font"); } } } // Note that SanitizeGlyphRuns scans all glyph runs in the textrun; // therefore we only call it once, at the end of textrun construction, // NOT incrementally as each glyph run is added (bug 680402). void gfxTextRun::SanitizeGlyphRuns() { if (mGlyphRuns.Length() <= 1) return; // If any glyph run starts with ligature-continuation characters, we need to advance it // to the first "real" character to avoid drawing partial ligature glyphs from wrong font // (seen with U+FEFF in reftest 474417-1, as Core Text eliminates the glyph, which makes // it appear as if a ligature has been formed) int32_t i, lastRunIndex = mGlyphRuns.Length() - 1; const CompressedGlyph *charGlyphs = mCharacterGlyphs; for (i = lastRunIndex; i >= 0; --i) { GlyphRun& run = mGlyphRuns[i]; while (charGlyphs[run.mCharacterOffset].IsLigatureContinuation() && run.mCharacterOffset < GetLength()) { run.mCharacterOffset++; } // if the run has become empty, eliminate it if ((i < lastRunIndex && run.mCharacterOffset >= mGlyphRuns[i+1].mCharacterOffset) || (i == lastRunIndex && run.mCharacterOffset == GetLength())) { mGlyphRuns.RemoveElementAt(i); --lastRunIndex; } } } uint32_t gfxTextRun::CountMissingGlyphs() { uint32_t i; uint32_t count = 0; for (i = 0; i < GetLength(); ++i) { if (mCharacterGlyphs[i].IsMissing()) { ++count; } } return count; } void gfxTextRun::CopyGlyphDataFrom(gfxShapedWord *aShapedWord, uint32_t aOffset) { uint32_t wordLen = aShapedWord->GetLength(); NS_ASSERTION(aOffset + wordLen <= GetLength(), "word overruns end of textrun!"); CompressedGlyph *charGlyphs = GetCharacterGlyphs(); const CompressedGlyph *wordGlyphs = aShapedWord->GetCharacterGlyphs(); if (aShapedWord->HasDetailedGlyphs()) { for (uint32_t i = 0; i < wordLen; ++i, ++aOffset) { const CompressedGlyph& g = wordGlyphs[i]; if (g.IsSimpleGlyph()) { charGlyphs[aOffset] = g; } else { const DetailedGlyph *details = g.GetGlyphCount() > 0 ? aShapedWord->GetDetailedGlyphs(i) : nullptr; SetGlyphs(aOffset, g, details); } } } else { memcpy(charGlyphs + aOffset, wordGlyphs, wordLen * sizeof(CompressedGlyph)); } } void gfxTextRun::CopyGlyphDataFrom(gfxTextRun *aSource, uint32_t aStart, uint32_t aLength, uint32_t aDest) { NS_ASSERTION(aStart + aLength <= aSource->GetLength(), "Source substring out of range"); NS_ASSERTION(aDest + aLength <= GetLength(), "Destination substring out of range"); if (aSource->mSkipDrawing) { mSkipDrawing = true; } // Copy base glyph data, and DetailedGlyph data where present const CompressedGlyph *srcGlyphs = aSource->mCharacterGlyphs + aStart; CompressedGlyph *dstGlyphs = mCharacterGlyphs + aDest; for (uint32_t i = 0; i < aLength; ++i) { CompressedGlyph g = srcGlyphs[i]; g.SetCanBreakBefore(!g.IsClusterStart() ? CompressedGlyph::FLAG_BREAK_TYPE_NONE : dstGlyphs[i].CanBreakBefore()); if (!g.IsSimpleGlyph()) { uint32_t count = g.GetGlyphCount(); if (count > 0) { DetailedGlyph *dst = AllocateDetailedGlyphs(i + aDest, count); if (dst) { DetailedGlyph *src = aSource->GetDetailedGlyphs(i + aStart); if (src) { ::memcpy(dst, src, count * sizeof(DetailedGlyph)); } else { g.SetMissing(0); } } else { g.SetMissing(0); } } } dstGlyphs[i] = g; } // Copy glyph runs GlyphRunIterator iter(aSource, aStart, aLength); #ifdef DEBUG gfxFont *lastFont = nullptr; #endif while (iter.NextRun()) { gfxFont *font = iter.GetGlyphRun()->mFont; NS_ASSERTION(font != lastFont, "Glyphruns not coalesced?"); #ifdef DEBUG lastFont = font; uint32_t end = iter.GetStringEnd(); #endif uint32_t start = iter.GetStringStart(); // These used to be NS_ASSERTION()s, but WARNING is more appropriate. // Although it's unusual (and not desirable), it's possible for us to assign // different fonts to a base character and a following diacritic. // Example on OSX 10.5/10.6 with default fonts installed: // data:text/html,

// &%23x043E;&%23x0486;&%23x20;&%23x043E;&%23x0486; // This means the rendering of the cluster will probably not be very good, // but it's the best we can do for now if the specified font only covered the // initial base character and not its applied marks. NS_WARN_IF_FALSE(aSource->IsClusterStart(start), "Started font run in the middle of a cluster"); NS_WARN_IF_FALSE(end == aSource->GetLength() || aSource->IsClusterStart(end), "Ended font run in the middle of a cluster"); nsresult rv = AddGlyphRun(font, iter.GetGlyphRun()->mMatchType, start - aStart + aDest, false, iter.GetGlyphRun()->mOrientation); if (NS_FAILED(rv)) return; } } void gfxTextRun::ClearGlyphsAndCharacters() { ResetGlyphRuns(); memset(reinterpret_cast(mCharacterGlyphs), 0, mLength * sizeof(CompressedGlyph)); mDetailedGlyphs = nullptr; } void gfxTextRun::SetSpaceGlyph(gfxFont *aFont, gfxContext *aContext, uint32_t aCharIndex, uint16_t aOrientation) { if (SetSpaceGlyphIfSimple(aFont, aContext, aCharIndex, ' ', aOrientation)) { return; } aFont->InitWordCache(); static const uint8_t space = ' '; uint32_t flags = gfxTextRunFactory::TEXT_IS_8BIT | gfxTextRunFactory::TEXT_IS_ASCII | gfxTextRunFactory::TEXT_IS_PERSISTENT | aOrientation; bool vertical = (GetFlags() & gfxTextRunFactory::TEXT_ORIENT_VERTICAL_UPRIGHT) != 0; gfxShapedWord *sw = aFont->GetShapedWord(aContext, &space, 1, gfxShapedWord::HashMix(0, ' '), MOZ_SCRIPT_LATIN, vertical, mAppUnitsPerDevUnit, flags, nullptr); if (sw) { AddGlyphRun(aFont, gfxTextRange::kFontGroup, aCharIndex, false, aOrientation); CopyGlyphDataFrom(sw, aCharIndex); } } bool gfxTextRun::SetSpaceGlyphIfSimple(gfxFont *aFont, gfxContext *aContext, uint32_t aCharIndex, char16_t aSpaceChar, uint16_t aOrientation) { uint32_t spaceGlyph = aFont->GetSpaceGlyph(); if (!spaceGlyph || !CompressedGlyph::IsSimpleGlyphID(spaceGlyph)) { return false; } gfxFont::Orientation fontOrientation = (aOrientation & gfxTextRunFactory::TEXT_ORIENT_VERTICAL_UPRIGHT) ? gfxFont::eVertical : gfxFont::eHorizontal; uint32_t spaceWidthAppUnits = NS_lroundf(aFont->GetMetrics(fontOrientation).spaceWidth * mAppUnitsPerDevUnit); if (!CompressedGlyph::IsSimpleAdvance(spaceWidthAppUnits)) { return false; } AddGlyphRun(aFont, gfxTextRange::kFontGroup, aCharIndex, false, aOrientation); CompressedGlyph g; g.SetSimpleGlyph(spaceWidthAppUnits, spaceGlyph); if (aSpaceChar == ' ') { g.SetIsSpace(); } GetCharacterGlyphs()[aCharIndex] = g; return true; } void gfxTextRun::FetchGlyphExtents(gfxContext *aRefContext) { bool needsGlyphExtents = NeedsGlyphExtents(this); if (!needsGlyphExtents && !mDetailedGlyphs) return; uint32_t i, runCount = mGlyphRuns.Length(); CompressedGlyph *charGlyphs = mCharacterGlyphs; for (i = 0; i < runCount; ++i) { const GlyphRun& run = mGlyphRuns[i]; gfxFont *font = run.mFont; if (MOZ_UNLIKELY(font->GetStyle()->size == 0)) { continue; } uint32_t start = run.mCharacterOffset; uint32_t end = i + 1 < runCount ? mGlyphRuns[i + 1].mCharacterOffset : GetLength(); bool fontIsSetup = false; uint32_t j; gfxGlyphExtents *extents = font->GetOrCreateGlyphExtents(mAppUnitsPerDevUnit); for (j = start; j < end; ++j) { const gfxTextRun::CompressedGlyph *glyphData = &charGlyphs[j]; gfxFont::Orientation orientation = IsVertical() ? gfxFont::eVertical : gfxFont::eHorizontal; if (glyphData->IsSimpleGlyph()) { // If we're in speed mode, don't set up glyph extents here; we'll // just return "optimistic" glyph bounds later if (needsGlyphExtents) { uint32_t glyphIndex = glyphData->GetSimpleGlyph(); if (!extents->IsGlyphKnown(glyphIndex)) { if (!fontIsSetup) { if (!font->SetupCairoFont(aRefContext)) { NS_WARNING("failed to set up font for glyph extents"); break; } fontIsSetup = true; } #ifdef DEBUG_TEXT_RUN_STORAGE_METRICS ++gGlyphExtentsSetupEagerSimple; #endif font->SetupGlyphExtents(aRefContext, orientation, glyphIndex, false, extents); } } } else if (!glyphData->IsMissing()) { uint32_t glyphCount = glyphData->GetGlyphCount(); if (glyphCount == 0) { continue; } const gfxTextRun::DetailedGlyph *details = GetDetailedGlyphs(j); if (!details) { continue; } for (uint32_t k = 0; k < glyphCount; ++k, ++details) { uint32_t glyphIndex = details->mGlyphID; if (!extents->IsGlyphKnownWithTightExtents(glyphIndex)) { if (!fontIsSetup) { if (!font->SetupCairoFont(aRefContext)) { NS_WARNING("failed to set up font for glyph extents"); break; } fontIsSetup = true; } #ifdef DEBUG_TEXT_RUN_STORAGE_METRICS ++gGlyphExtentsSetupEagerTight; #endif font->SetupGlyphExtents(aRefContext, orientation, glyphIndex, true, extents); } } } } } } gfxTextRun::ClusterIterator::ClusterIterator(gfxTextRun *aTextRun) : mTextRun(aTextRun), mCurrentChar(uint32_t(-1)) { } void gfxTextRun::ClusterIterator::Reset() { mCurrentChar = uint32_t(-1); } bool gfxTextRun::ClusterIterator::NextCluster() { uint32_t len = mTextRun->GetLength(); while (++mCurrentChar < len) { if (mTextRun->IsClusterStart(mCurrentChar)) { return true; } } mCurrentChar = uint32_t(-1); return false; } uint32_t gfxTextRun::ClusterIterator::ClusterLength() const { if (mCurrentChar == uint32_t(-1)) { return 0; } uint32_t i = mCurrentChar, len = mTextRun->GetLength(); while (++i < len) { if (mTextRun->IsClusterStart(i)) { break; } } return i - mCurrentChar; } gfxFloat gfxTextRun::ClusterIterator::ClusterAdvance(PropertyProvider *aProvider) const { if (mCurrentChar == uint32_t(-1)) { return 0; } return mTextRun->GetAdvanceWidth(mCurrentChar, ClusterLength(), aProvider); } size_t gfxTextRun::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) { // The second arg is how much gfxTextRun::AllocateStorage would have // allocated. size_t total = mGlyphRuns.SizeOfExcludingThis(aMallocSizeOf); if (mDetailedGlyphs) { total += mDetailedGlyphs->SizeOfIncludingThis(aMallocSizeOf); } return total; } size_t gfxTextRun::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) { return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf); } #ifdef DEBUG void gfxTextRun::Dump(FILE* aOutput) { if (!aOutput) { aOutput = stdout; } uint32_t i; fputc('[', aOutput); for (i = 0; i < mGlyphRuns.Length(); ++i) { if (i > 0) { fputc(',', aOutput); } gfxFont* font = mGlyphRuns[i].mFont; const gfxFontStyle* style = font->GetStyle(); NS_ConvertUTF16toUTF8 fontName(font->GetName()); nsAutoCString lang; style->language->ToUTF8String(lang); fprintf(aOutput, "%d: %s %f/%d/%d/%s", mGlyphRuns[i].mCharacterOffset, fontName.get(), style->size, style->weight, style->style, lang.get()); } fputc(']', aOutput); } #endif gfxFontGroup::gfxFontGroup(const FontFamilyList& aFontFamilyList, const gfxFontStyle *aStyle, gfxUserFontSet *aUserFontSet) : mFamilyList(aFontFamilyList) , mStyle(*aStyle) , mUnderlineOffset(UNDERLINE_OFFSET_NOT_SET) , mHyphenWidth(-1) , mUserFontSet(aUserFontSet) , mTextPerf(nullptr) , mPageLang(gfxPlatform::GetFontPrefLangFor(aStyle->language)) , mSkipDrawing(false) { // We don't use SetUserFontSet() here, as we want to unconditionally call // BuildFontList() rather than only do UpdateUserFonts() if it changed. mCurrGeneration = GetGeneration(); BuildFontList(); } gfxFontGroup::~gfxFontGroup() { } void gfxFontGroup::FindGenericFonts(FontFamilyType aGenericType, nsIAtom *aLanguage, void *aClosure) { nsAutoTArray resolvedGenerics; ResolveGenericFontNames(aGenericType, aLanguage, resolvedGenerics); uint32_t g = 0, numGenerics = resolvedGenerics.Length(); for (g = 0; g < numGenerics; g++) { FindPlatformFont(resolvedGenerics[g], false, aClosure); } } /* static */ void gfxFontGroup::ResolveGenericFontNames(FontFamilyType aGenericType, nsIAtom *aLanguage, nsTArray& aGenericFamilies) { static const char kGeneric_serif[] = "serif"; static const char kGeneric_sans_serif[] = "sans-serif"; static const char kGeneric_monospace[] = "monospace"; static const char kGeneric_cursive[] = "cursive"; static const char kGeneric_fantasy[] = "fantasy"; // treat -moz-fixed as monospace if (aGenericType == eFamily_moz_fixed) { aGenericType = eFamily_monospace; } // type should be standard generic type at this point NS_ASSERTION(aGenericType >= eFamily_serif && aGenericType <= eFamily_fantasy, "standard generic font family type required"); // create the lang string nsIAtom *langGroupAtom = nullptr; nsAutoCString langGroupString; if (aLanguage) { if (!gLangService) { CallGetService(NS_LANGUAGEATOMSERVICE_CONTRACTID, &gLangService); } if (gLangService) { nsresult rv; langGroupAtom = gLangService->GetLanguageGroup(aLanguage, &rv); } } if (!langGroupAtom) { langGroupAtom = nsGkAtoms::Unicode; } langGroupAtom->ToUTF8String(langGroupString); // map generic type to string const char *generic = nullptr; switch (aGenericType) { case eFamily_serif: generic = kGeneric_serif; break; case eFamily_sans_serif: generic = kGeneric_sans_serif; break; case eFamily_monospace: generic = kGeneric_monospace; break; case eFamily_cursive: generic = kGeneric_cursive; break; case eFamily_fantasy: generic = kGeneric_fantasy; break; default: break; } if (!generic) { return; } aGenericFamilies.Clear(); // load family for "font.name.generic.lang" nsAutoCString prefFontName("font.name."); prefFontName.Append(generic); prefFontName.Append('.'); prefFontName.Append(langGroupString); gfxFontUtils::AppendPrefsFontList(prefFontName.get(), aGenericFamilies); // if lang has pref fonts, also load fonts for "font.name-list.generic.lang" if (!aGenericFamilies.IsEmpty()) { nsAutoCString prefFontListName("font.name-list."); prefFontListName.Append(generic); prefFontListName.Append('.'); prefFontListName.Append(langGroupString); gfxFontUtils::AppendPrefsFontList(prefFontListName.get(), aGenericFamilies); } #if 0 // dump out generic mappings printf("%s ===> ", prefFontName.get()); for (uint32_t k = 0; k < aGenericFamilies.Length(); k++) { if (k > 0) printf(", "); printf("%s", NS_ConvertUTF16toUTF8(aGenericFamilies[k]).get()); } printf("\n"); #endif } void gfxFontGroup::EnumerateFontList(nsIAtom *aLanguage, void *aClosure) { // initialize fonts in the font family list const nsTArray& fontlist = mFamilyList.GetFontlist(); // lookup fonts in the fontlist uint32_t i, numFonts = fontlist.Length(); for (i = 0; i < numFonts; i++) { const FontFamilyName& name = fontlist[i]; if (name.IsNamed()) { FindPlatformFont(name.mName, true, aClosure); } else { FindGenericFonts(name.mType, aLanguage, aClosure); } } // if necessary, append default generic onto the end if (mFamilyList.GetDefaultFontType() != eFamily_none && !mFamilyList.HasDefaultGeneric()) { FindGenericFonts(mFamilyList.GetDefaultFontType(), aLanguage, aClosure); } } void gfxFontGroup::BuildFontList() { // gfxPangoFontGroup behaves differently, so this method is a no-op on that platform #if defined(XP_MACOSX) || defined(XP_WIN) || defined(ANDROID) EnumerateFontList(mStyle.language); #endif } void gfxFontGroup::FindPlatformFont(const nsAString& aName, bool aUseFontSet, void *aClosure) { bool needsBold; gfxFontFamily *family = nullptr; gfxFontEntry *fe = nullptr; if (aUseFontSet) { // First, look up in the user font set... // If the fontSet matches the family, we must not look for a platform // font of the same name, even if we fail to actually get a fontEntry // here; we'll fall back to the next name in the CSS font-family list. if (mUserFontSet) { // Add userfonts to the fontlist whether already loaded // or not. Loading is initiated during font matching. family = mUserFontSet->LookupFamily(aName); if (family) { nsAutoTArray userfonts; family->FindAllFontsForStyle(mStyle, userfonts, needsBold); // add these to the fontlist uint32_t count = userfonts.Length(); for (uint32_t i = 0; i < count; i++) { fe = userfonts[i]; FamilyFace ff(family, fe, needsBold); ff.CheckState(mSkipDrawing); mFonts.AppendElement(ff); } } } } // Not known in the user font set ==> check system fonts if (!family) { gfxPlatformFontList *fontList = gfxPlatformFontList::PlatformFontList(); family = fontList->FindFamily(aName, mStyle.systemFont); if (family) { fe = family->FindFontForStyle(mStyle, needsBold); } } // add to the font group, unless it's already there if (fe && !HasFont(fe)) { mFonts.AppendElement(FamilyFace(family, fe, needsBold)); } } bool gfxFontGroup::HasFont(const gfxFontEntry *aFontEntry) { uint32_t count = mFonts.Length(); for (uint32_t i = 0; i < count; ++i) { if (mFonts[i].FontEntry() == aFontEntry) { return true; } } return false; } gfxFont* gfxFontGroup::GetFontAt(int32_t i, uint32_t aCh) { if (uint32_t(i) >= mFonts.Length()) { return nullptr; } FamilyFace& ff = mFonts[i]; if (ff.IsInvalid() || ff.IsLoading()) { return nullptr; } nsRefPtr font = ff.Font(); if (!font) { gfxFontEntry* fe = mFonts[i].FontEntry(); gfxCharacterMap* unicodeRangeMap = nullptr; if (fe->mIsUserFontContainer) { gfxUserFontEntry* ufe = static_cast(fe); if (ufe->LoadState() == gfxUserFontEntry::STATUS_NOT_LOADED && ufe->CharacterInUnicodeRange(aCh) && !FontLoadingForFamily(ff.Family(), aCh)) { ufe->Load(); ff.CheckState(mSkipDrawing); } fe = ufe->GetPlatformFontEntry(); if (!fe) { return nullptr; } unicodeRangeMap = ufe->GetUnicodeRangeMap(); } font = fe->FindOrMakeFont(&mStyle, mFonts[i].NeedsBold(), unicodeRangeMap); if (!font || !font->Valid()) { ff.SetInvalid(); return nullptr; } mFonts[i].SetFont(font); } return font.get(); } void gfxFontGroup::FamilyFace::CheckState(bool& aSkipDrawing) { gfxFontEntry* fe = FontEntry(); if (fe->mIsUserFontContainer) { gfxUserFontEntry* ufe = static_cast(fe); gfxUserFontEntry::UserFontLoadState state = ufe->LoadState(); switch (state) { case gfxUserFontEntry::STATUS_LOADING: SetLoading(true); break; case gfxUserFontEntry::STATUS_FAILED: SetInvalid(); // fall-thru to the default case default: SetLoading(false); } if (ufe->WaitForUserFont()) { aSkipDrawing = true; } } } bool gfxFontGroup::FontLoadingForFamily(gfxFontFamily* aFamily, uint32_t aCh) const { uint32_t count = mFonts.Length(); for (uint32_t i = 0; i < count; ++i) { const FamilyFace& ff = mFonts[i]; if (ff.IsLoading() && ff.Family() == aFamily) { const gfxUserFontEntry* ufe = static_cast(ff.FontEntry()); if (ufe->CharacterInUnicodeRange(aCh)) { return true; } } } return false; } gfxFont* gfxFontGroup::GetDefaultFont() { if (mDefaultFont) { return mDefaultFont.get(); } bool needsBold; gfxPlatformFontList *pfl = gfxPlatformFontList::PlatformFontList(); gfxFontFamily *defaultFamily = pfl->GetDefaultFont(&mStyle); NS_ASSERTION(defaultFamily, "invalid default font returned by GetDefaultFont"); if (defaultFamily) { gfxFontEntry *fe = defaultFamily->FindFontForStyle(mStyle, needsBold); if (fe) { mDefaultFont = fe->FindOrMakeFont(&mStyle, needsBold); } } if (!mDefaultFont) { // Try for a "font of last resort...." // Because an empty font list would be Really Bad for later code // that assumes it will be able to get valid metrics for layout, // just look for the first usable font and put in the list. // (see bug 554544) nsAutoTArray,200> families; pfl->GetFontFamilyList(families); uint32_t count = families.Length(); for (uint32_t i = 0; i < count; ++i) { gfxFontEntry *fe = families[i]->FindFontForStyle(mStyle, needsBold); if (fe) { mDefaultFont = fe->FindOrMakeFont(&mStyle, needsBold); } } } if (!mDefaultFont) { // an empty font list at this point is fatal; we're not going to // be able to do even the most basic layout operations char msg[256]; // CHECK buffer length if revising message below nsAutoString families; mFamilyList.ToString(families); sprintf(msg, "unable to find a usable font (%.220s)", NS_ConvertUTF16toUTF8(families).get()); NS_RUNTIMEABORT(msg); } return mDefaultFont.get(); } gfxFont* gfxFontGroup::GetFirstValidFont(uint32_t aCh) { uint32_t count = mFonts.Length(); for (uint32_t i = 0; i < count; ++i) { FamilyFace& ff = mFonts[i]; if (ff.IsInvalid()) { continue; } // already have a font? gfxFont* font = ff.Font(); if (font) { return font; } // Need to build a font, loading userfont if not loaded. In // cases where unicode range might apply, use the character // provided. if (ff.IsUserFontContainer()) { gfxUserFontEntry* ufe = static_cast(mFonts[i].FontEntry()); bool inRange = ufe->CharacterInUnicodeRange(aCh); if (ufe->LoadState() == gfxUserFontEntry::STATUS_NOT_LOADED && inRange && !FontLoadingForFamily(ff.Family(), aCh)) { ufe->Load(); ff.CheckState(mSkipDrawing); } if (ufe->LoadState() != gfxUserFontEntry::STATUS_LOADED || !inRange) { continue; } } font = GetFontAt(i, aCh); if (font) { return font; } } return GetDefaultFont(); } gfxFont * gfxFontGroup::GetFirstMathFont() { uint32_t count = mFonts.Length(); for (uint32_t i = 0; i < count; ++i) { gfxFont* font = GetFontAt(i); if (font && font->GetFontEntry()->TryGetMathTable()) { return font; } } return nullptr; } gfxFontGroup * gfxFontGroup::Copy(const gfxFontStyle *aStyle) { gfxFontGroup *fg = new gfxFontGroup(mFamilyList, aStyle, mUserFontSet); fg->SetTextPerfMetrics(mTextPerf); return fg; } bool gfxFontGroup::IsInvalidChar(uint8_t ch) { return ((ch & 0x7f) < 0x20 || ch == 0x7f); } bool gfxFontGroup::IsInvalidChar(char16_t ch) { // All printable 7-bit ASCII values are OK if (ch >= ' ' && ch < 0x7f) { return false; } // No point in sending non-printing control chars through font shaping if (ch <= 0x9f) { return true; } return (((ch & 0xFF00) == 0x2000 /* Unicode control character */ && (ch == 0x200B/*ZWSP*/ || ch == 0x2028/*LSEP*/ || ch == 0x2029/*PSEP*/)) || IsBidiControl(ch)); } gfxTextRun * gfxFontGroup::MakeEmptyTextRun(const Parameters *aParams, uint32_t aFlags) { aFlags |= TEXT_IS_8BIT | TEXT_IS_ASCII | TEXT_IS_PERSISTENT; return gfxTextRun::Create(aParams, 0, this, aFlags); } gfxTextRun * gfxFontGroup::MakeSpaceTextRun(const Parameters *aParams, uint32_t aFlags) { aFlags |= TEXT_IS_8BIT | TEXT_IS_ASCII | TEXT_IS_PERSISTENT; gfxTextRun *textRun = gfxTextRun::Create(aParams, 1, this, aFlags); if (!textRun) { return nullptr; } uint16_t orientation = aFlags & TEXT_ORIENT_MASK; if (orientation == TEXT_ORIENT_VERTICAL_MIXED) { orientation = TEXT_ORIENT_VERTICAL_SIDEWAYS_RIGHT; } gfxFont *font = GetFirstValidFont(); if (MOZ_UNLIKELY(GetStyle()->size == 0)) { // Short-circuit for size-0 fonts, as Windows and ATSUI can't handle // them, and always create at least size 1 fonts, i.e. they still // render something for size 0 fonts. textRun->AddGlyphRun(font, gfxTextRange::kFontGroup, 0, false, orientation); } else { if (font->GetSpaceGlyph()) { // Normally, the font has a cached space glyph, so we can avoid // the cost of calling FindFontForChar. textRun->SetSpaceGlyph(font, aParams->mContext, 0, orientation); } else { // In case the primary font doesn't have (bug 970891), // find one that does. uint8_t matchType; nsRefPtr spaceFont = FindFontForChar(' ', 0, 0, MOZ_SCRIPT_LATIN, nullptr, &matchType); if (spaceFont) { textRun->SetSpaceGlyph(spaceFont, aParams->mContext, 0, orientation); } } } // Note that the gfxGlyphExtents glyph bounds storage for the font will // always contain an entry for the font's space glyph, so we don't have // to call FetchGlyphExtents here. return textRun; } gfxTextRun * gfxFontGroup::MakeBlankTextRun(uint32_t aLength, const Parameters *aParams, uint32_t aFlags) { gfxTextRun *textRun = gfxTextRun::Create(aParams, aLength, this, aFlags); if (!textRun) { return nullptr; } uint16_t orientation = aFlags & TEXT_ORIENT_MASK; if (orientation == TEXT_ORIENT_VERTICAL_MIXED) { orientation = TEXT_ORIENT_VERTICAL_UPRIGHT; } textRun->AddGlyphRun(GetFirstValidFont(), gfxTextRange::kFontGroup, 0, false, orientation); return textRun; } gfxTextRun * gfxFontGroup::MakeHyphenTextRun(gfxContext *aCtx, uint32_t aAppUnitsPerDevUnit) { // only use U+2010 if it is supported by the first font in the group; // it's better to use ASCII '-' from the primary font than to fall back to // U+2010 from some other, possibly poorly-matching face static const char16_t hyphen = 0x2010; gfxFont *font = GetFirstValidFont(uint32_t(hyphen)); if (font->HasCharacter(hyphen)) { return MakeTextRun(&hyphen, 1, aCtx, aAppUnitsPerDevUnit, gfxFontGroup::TEXT_IS_PERSISTENT, nullptr); } static const uint8_t dash = '-'; return MakeTextRun(&dash, 1, aCtx, aAppUnitsPerDevUnit, gfxFontGroup::TEXT_IS_PERSISTENT, nullptr); } gfxFloat gfxFontGroup::GetHyphenWidth(gfxTextRun::PropertyProvider *aProvider) { if (mHyphenWidth < 0) { nsRefPtr ctx(aProvider->GetContext()); if (ctx) { nsAutoPtr hyphRun(MakeHyphenTextRun(ctx, aProvider->GetAppUnitsPerDevUnit())); mHyphenWidth = hyphRun.get() ? hyphRun->GetAdvanceWidth(0, hyphRun->GetLength(), nullptr) : 0; } } return mHyphenWidth; } gfxTextRun * gfxFontGroup::MakeTextRun(const uint8_t *aString, uint32_t aLength, const Parameters *aParams, uint32_t aFlags, gfxMissingFontRecorder *aMFR) { if (aLength == 0) { return MakeEmptyTextRun(aParams, aFlags); } if (aLength == 1 && aString[0] == ' ') { return MakeSpaceTextRun(aParams, aFlags); } aFlags |= TEXT_IS_8BIT; if (GetStyle()->size == 0) { // Short-circuit for size-0 fonts, as Windows and ATSUI can't handle // them, and always create at least size 1 fonts, i.e. they still // render something for size 0 fonts. return MakeBlankTextRun(aLength, aParams, aFlags); } gfxTextRun *textRun = gfxTextRun::Create(aParams, aLength, this, aFlags); if (!textRun) { return nullptr; } InitTextRun(aParams->mContext, textRun, aString, aLength, aMFR); textRun->FetchGlyphExtents(aParams->mContext); return textRun; } gfxTextRun * gfxFontGroup::MakeTextRun(const char16_t *aString, uint32_t aLength, const Parameters *aParams, uint32_t aFlags, gfxMissingFontRecorder *aMFR) { if (aLength == 0) { return MakeEmptyTextRun(aParams, aFlags); } if (aLength == 1 && aString[0] == ' ') { return MakeSpaceTextRun(aParams, aFlags); } if (GetStyle()->size == 0) { return MakeBlankTextRun(aLength, aParams, aFlags); } gfxTextRun *textRun = gfxTextRun::Create(aParams, aLength, this, aFlags); if (!textRun) { return nullptr; } InitTextRun(aParams->mContext, textRun, aString, aLength, aMFR); textRun->FetchGlyphExtents(aParams->mContext); return textRun; } template void gfxFontGroup::InitTextRun(gfxContext *aContext, gfxTextRun *aTextRun, const T *aString, uint32_t aLength, gfxMissingFontRecorder *aMFR) { NS_ASSERTION(aLength > 0, "don't call InitTextRun for a zero-length run"); // we need to do numeral processing even on 8-bit text, // in case we're converting Western to Hindi/Arabic digits int32_t numOption = gfxPlatform::GetPlatform()->GetBidiNumeralOption(); nsAutoArrayPtr transformedString; if (numOption != IBMBIDI_NUMERAL_NOMINAL) { // scan the string for numerals that may need to be transformed; // if we find any, we'll make a local copy here and use that for // font matching and glyph generation/shaping bool prevIsArabic = (aTextRun->GetFlags() & gfxTextRunFactory::TEXT_INCOMING_ARABICCHAR) != 0; for (uint32_t i = 0; i < aLength; ++i) { char16_t origCh = aString[i]; char16_t newCh = HandleNumberInChar(origCh, prevIsArabic, numOption); if (newCh != origCh) { if (!transformedString) { transformedString = new char16_t[aLength]; if (sizeof(T) == sizeof(char16_t)) { memcpy(transformedString.get(), aString, i * sizeof(char16_t)); } else { for (uint32_t j = 0; j < i; ++j) { transformedString[j] = aString[j]; } } } } if (transformedString) { transformedString[i] = newCh; } prevIsArabic = IS_ARABIC_CHAR(newCh); } } #ifdef PR_LOGGING PRLogModuleInfo *log = (mStyle.systemFont ? gfxPlatform::GetLog(eGfxLog_textrunui) : gfxPlatform::GetLog(eGfxLog_textrun)); #endif // variant fallback handling may end up passing through this twice bool redo; do { redo = false; if (sizeof(T) == sizeof(uint8_t) && !transformedString) { #ifdef PR_LOGGING if (MOZ_UNLIKELY(PR_LOG_TEST(log, PR_LOG_WARNING))) { nsAutoCString lang; mStyle.language->ToUTF8String(lang); nsAutoString families; mFamilyList.ToString(families); nsAutoCString str((const char*)aString, aLength); PR_LOG(log, PR_LOG_WARNING,\ ("(%s) fontgroup: [%s] default: %s lang: %s script: %d " "len %d weight: %d width: %d style: %s size: %6.2f %d-byte " "TEXTRUN [%s] ENDTEXTRUN\n", (mStyle.systemFont ? "textrunui" : "textrun"), NS_ConvertUTF16toUTF8(families).get(), (mFamilyList.GetDefaultFontType() == eFamily_serif ? "serif" : (mFamilyList.GetDefaultFontType() == eFamily_sans_serif ? "sans-serif" : "none")), lang.get(), MOZ_SCRIPT_LATIN, aLength, uint32_t(mStyle.weight), uint32_t(mStyle.stretch), (mStyle.style & NS_FONT_STYLE_ITALIC ? "italic" : (mStyle.style & NS_FONT_STYLE_OBLIQUE ? "oblique" : "normal")), mStyle.size, sizeof(T), str.get())); } #endif // the text is still purely 8-bit; bypass the script-run itemizer // and treat it as a single Latin run InitScriptRun(aContext, aTextRun, aString, 0, aLength, MOZ_SCRIPT_LATIN, aMFR); } else { const char16_t *textPtr; if (transformedString) { textPtr = transformedString.get(); } else { // typecast to avoid compilation error for the 8-bit version, // even though this is dead code in that case textPtr = reinterpret_cast(aString); } // split into script runs so that script can potentially influence // the font matching process below gfxScriptItemizer scriptRuns(textPtr, aLength); uint32_t runStart = 0, runLimit = aLength; int32_t runScript = MOZ_SCRIPT_LATIN; while (scriptRuns.Next(runStart, runLimit, runScript)) { #ifdef PR_LOGGING if (MOZ_UNLIKELY(PR_LOG_TEST(log, PR_LOG_WARNING))) { nsAutoCString lang; mStyle.language->ToUTF8String(lang); nsAutoString families; mFamilyList.ToString(families); uint32_t runLen = runLimit - runStart; PR_LOG(log, PR_LOG_WARNING,\ ("(%s) fontgroup: [%s] default: %s lang: %s script: %d " "len %d weight: %d width: %d style: %s size: %6.2f " "%d-byte TEXTRUN [%s] ENDTEXTRUN\n", (mStyle.systemFont ? "textrunui" : "textrun"), NS_ConvertUTF16toUTF8(families).get(), (mFamilyList.GetDefaultFontType() == eFamily_serif ? "serif" : (mFamilyList.GetDefaultFontType() == eFamily_sans_serif ? "sans-serif" : "none")), lang.get(), runScript, runLen, uint32_t(mStyle.weight), uint32_t(mStyle.stretch), (mStyle.style & NS_FONT_STYLE_ITALIC ? "italic" : (mStyle.style & NS_FONT_STYLE_OBLIQUE ? "oblique" : "normal")), mStyle.size, sizeof(T), NS_ConvertUTF16toUTF8(textPtr + runStart, runLen).get())); } #endif InitScriptRun(aContext, aTextRun, textPtr + runStart, runStart, runLimit - runStart, runScript, aMFR); } } // if shaping was aborted due to lack of feature support, clear out // glyph runs and redo shaping with fallback forced on if (aTextRun->GetShapingState() == gfxTextRun::eShapingState_Aborted) { redo = true; aTextRun->SetShapingState( gfxTextRun::eShapingState_ForceFallbackFeature); aTextRun->ClearGlyphsAndCharacters(); } } while (redo); if (sizeof(T) == sizeof(char16_t) && aLength > 0) { gfxTextRun::CompressedGlyph *glyph = aTextRun->GetCharacterGlyphs(); if (!glyph->IsSimpleGlyph()) { glyph->SetClusterStart(true); } } // It's possible for CoreText to omit glyph runs if it decides they contain // only invisibles (e.g., U+FEFF, see reftest 474417-1). In this case, we // need to eliminate them from the glyph run array to avoid drawing "partial // ligatures" with the wrong font. // We don't do this during InitScriptRun (or gfxFont::InitTextRun) because // it will iterate back over all glyphruns in the textrun, which leads to // pathologically-bad perf in the case where a textrun contains many script // changes (see bug 680402) - we'd end up re-sanitizing all the earlier runs // every time a new script subrun is processed. aTextRun->SanitizeGlyphRuns(); aTextRun->SortGlyphRuns(); } static inline bool IsPUA(uint32_t aUSV) { // We could look up the General Category of the codepoint here, // but it's simpler to check PUA codepoint ranges. return (aUSV >= 0xE000 && aUSV <= 0xF8FF) || (aUSV >= 0xF0000); } template void gfxFontGroup::InitScriptRun(gfxContext *aContext, gfxTextRun *aTextRun, const T *aString, // text for this script run, // not the entire textrun uint32_t aOffset, // position of the script run // within the textrun uint32_t aLength, // length of the script run int32_t aRunScript, gfxMissingFontRecorder *aMFR) { NS_ASSERTION(aLength > 0, "don't call InitScriptRun for a 0-length run"); NS_ASSERTION(aTextRun->GetShapingState() != gfxTextRun::eShapingState_Aborted, "don't call InitScriptRun with aborted shaping state"); #if defined(XP_MACOSX) || defined(XP_WIN) || defined(ANDROID) // non-linux platforms build the fontlist lazily and include userfonts // so need to confirm the load state of userfonts in the list if (mUserFontSet && mCurrGeneration != mUserFontSet->GetGeneration()) { UpdateUserFonts(); } #endif gfxFont *mainFont = GetFirstValidFont(); uint32_t runStart = 0; nsAutoTArray fontRanges; ComputeRanges(fontRanges, aString, aLength, aRunScript, aTextRun->GetFlags() & gfxTextRunFactory::TEXT_ORIENT_MASK); uint32_t numRanges = fontRanges.Length(); bool missingChars = false; for (uint32_t r = 0; r < numRanges; r++) { const gfxTextRange& range = fontRanges[r]; uint32_t matchedLength = range.Length(); gfxFont *matchedFont = range.font; bool vertical = range.orientation == gfxTextRunFactory::TEXT_ORIENT_VERTICAL_UPRIGHT; // create the glyph run for this range if (matchedFont && mStyle.noFallbackVariantFeatures) { // common case - just do glyph layout and record the // resulting positioned glyphs aTextRun->AddGlyphRun(matchedFont, range.matchType, aOffset + runStart, (matchedLength > 0), range.orientation); if (!matchedFont->SplitAndInitTextRun(aContext, aTextRun, aString + runStart, aOffset + runStart, matchedLength, aRunScript, vertical)) { // glyph layout failed! treat as missing glyphs matchedFont = nullptr; } } else if (matchedFont) { // shape with some variant feature that requires fallback handling bool petiteToSmallCaps = false; bool syntheticLower = false; bool syntheticUpper = false; if (mStyle.variantSubSuper != NS_FONT_VARIANT_POSITION_NORMAL && (aTextRun->GetShapingState() == gfxTextRun::eShapingState_ForceFallbackFeature || !matchedFont->SupportsSubSuperscript(mStyle.variantSubSuper, aString, aLength, aRunScript))) { // fallback for subscript/superscript variant glyphs // if the feature was already used, abort and force // fallback across the entire textrun gfxTextRun::ShapingState ss = aTextRun->GetShapingState(); if (ss == gfxTextRun::eShapingState_Normal) { aTextRun->SetShapingState(gfxTextRun::eShapingState_ShapingWithFallback); } else if (ss == gfxTextRun::eShapingState_ShapingWithFeature) { aTextRun->SetShapingState(gfxTextRun::eShapingState_Aborted); return; } nsRefPtr subSuperFont = matchedFont->GetSubSuperscriptFont(aTextRun->GetAppUnitsPerDevUnit()); aTextRun->AddGlyphRun(subSuperFont, range.matchType, aOffset + runStart, (matchedLength > 0), range.orientation); if (!subSuperFont->SplitAndInitTextRun(aContext, aTextRun, aString + runStart, aOffset + runStart, matchedLength, aRunScript, vertical)) { // glyph layout failed! treat as missing glyphs matchedFont = nullptr; } } else if (mStyle.variantCaps != NS_FONT_VARIANT_CAPS_NORMAL && !matchedFont->SupportsVariantCaps(aRunScript, mStyle.variantCaps, petiteToSmallCaps, syntheticLower, syntheticUpper)) { // fallback for small-caps variant glyphs if (!matchedFont->InitFakeSmallCapsRun(aContext, aTextRun, aString + runStart, aOffset + runStart, matchedLength, range.matchType, range.orientation, aRunScript, syntheticLower, syntheticUpper)) { matchedFont = nullptr; } } else { // shape normally with variant feature enabled gfxTextRun::ShapingState ss = aTextRun->GetShapingState(); // adjust the shaping state if necessary if (ss == gfxTextRun::eShapingState_Normal) { aTextRun->SetShapingState(gfxTextRun::eShapingState_ShapingWithFeature); } else if (ss == gfxTextRun::eShapingState_ShapingWithFallback) { // already have shaping results using fallback, need to redo aTextRun->SetShapingState(gfxTextRun::eShapingState_Aborted); return; } // do glyph layout and record the resulting positioned glyphs aTextRun->AddGlyphRun(matchedFont, range.matchType, aOffset + runStart, (matchedLength > 0), range.orientation); if (!matchedFont->SplitAndInitTextRun(aContext, aTextRun, aString + runStart, aOffset + runStart, matchedLength, aRunScript, vertical)) { // glyph layout failed! treat as missing glyphs matchedFont = nullptr; } } } else { aTextRun->AddGlyphRun(mainFont, gfxTextRange::kFontGroup, aOffset + runStart, (matchedLength > 0), range.orientation); } if (!matchedFont) { // We need to set cluster boundaries (and mark spaces) so that // surrogate pairs, combining characters, etc behave properly, // even if we don't have glyphs for them aTextRun->SetupClusterBoundaries(aOffset + runStart, aString + runStart, matchedLength); // various "missing" characters may need special handling, // so we check for them here uint32_t runLimit = runStart + matchedLength; for (uint32_t index = runStart; index < runLimit; index++) { T ch = aString[index]; // tab and newline are not to be displayed as hexboxes, // but do need to be recorded in the textrun if (ch == '\n') { aTextRun->SetIsNewline(aOffset + index); continue; } if (ch == '\t') { aTextRun->SetIsTab(aOffset + index); continue; } // for 16-bit textruns only, check for surrogate pairs and // special Unicode spaces; omit these checks in 8-bit runs if (sizeof(T) == sizeof(char16_t)) { if (NS_IS_HIGH_SURROGATE(ch) && index + 1 < aLength && NS_IS_LOW_SURROGATE(aString[index + 1])) { uint32_t usv = SURROGATE_TO_UCS4(ch, aString[index + 1]); aTextRun->SetMissingGlyph(aOffset + index, usv, mainFont); index++; if (!mSkipDrawing && !IsPUA(usv)) { missingChars = true; } continue; } // check if this is a known Unicode whitespace character that // we can render using the space glyph with a custom width gfxFloat wid = mainFont->SynthesizeSpaceWidth(ch); if (wid >= 0.0) { nscoord advance = aTextRun->GetAppUnitsPerDevUnit() * floor(wid + 0.5); if (gfxShapedText::CompressedGlyph::IsSimpleAdvance(advance)) { aTextRun->GetCharacterGlyphs()[aOffset + index]. SetSimpleGlyph(advance, mainFont->GetSpaceGlyph()); } else { gfxTextRun::DetailedGlyph detailedGlyph; detailedGlyph.mGlyphID = mainFont->GetSpaceGlyph(); detailedGlyph.mAdvance = advance; detailedGlyph.mXOffset = detailedGlyph.mYOffset = 0; gfxShapedText::CompressedGlyph g; g.SetComplex(true, true, 1); aTextRun->SetGlyphs(aOffset + index, g, &detailedGlyph); } continue; } } if (IsInvalidChar(ch)) { // invalid chars are left as zero-width/invisible continue; } // record char code so we can draw a box with the Unicode value aTextRun->SetMissingGlyph(aOffset + index, ch, mainFont); if (!mSkipDrawing && !IsPUA(ch)) { missingChars = true; } } } runStart += matchedLength; } if (aMFR && missingChars) { aMFR->RecordScript(aRunScript); } } gfxTextRun * gfxFontGroup::GetEllipsisTextRun(int32_t aAppUnitsPerDevPixel, LazyReferenceContextGetter& aRefContextGetter) { if (mCachedEllipsisTextRun && mCachedEllipsisTextRun->GetAppUnitsPerDevUnit() == aAppUnitsPerDevPixel) { return mCachedEllipsisTextRun; } // Use a Unicode ellipsis if the font supports it, // otherwise use three ASCII periods as fallback. gfxFont* firstFont = GetFirstValidFont(uint32_t(kEllipsisChar[0])); nsString ellipsis = firstFont->HasCharacter(kEllipsisChar[0]) ? nsDependentString(kEllipsisChar, ArrayLength(kEllipsisChar) - 1) : nsDependentString(kASCIIPeriodsChar, ArrayLength(kASCIIPeriodsChar) - 1); nsRefPtr refCtx = aRefContextGetter.GetRefContext(); Parameters params = { refCtx, nullptr, nullptr, nullptr, 0, aAppUnitsPerDevPixel }; gfxTextRun* textRun = MakeTextRun(ellipsis.get(), ellipsis.Length(), ¶ms, TEXT_IS_PERSISTENT, nullptr); if (!textRun) { return nullptr; } mCachedEllipsisTextRun = textRun; textRun->ReleaseFontGroup(); // don't let the presence of a cached ellipsis // textrun prolong the fontgroup's life return textRun; } already_AddRefed gfxFontGroup::FindNonItalicFaceForChar(gfxFontFamily* aFamily, uint32_t aCh) { NS_ASSERTION(mStyle.style != NS_FONT_STYLE_NORMAL, "should only be called in the italic/oblique case"); if (!aFamily->TestCharacterMap(aCh)) { return nullptr; } gfxFontStyle regularStyle = mStyle; regularStyle.style = NS_FONT_STYLE_NORMAL; bool needsBold; gfxFontEntry *fe = aFamily->FindFontForStyle(regularStyle, needsBold); NS_ASSERTION(!fe->mIsUserFontContainer, "should only be searching platform fonts"); if (!fe->HasCharacter(aCh)) { return nullptr; } nsRefPtr font = fe->FindOrMakeFont(&mStyle, needsBold); if (!font->Valid()) { return nullptr; } return font.forget(); } gfxFloat gfxFontGroup::GetUnderlineOffset() { if (mUnderlineOffset == UNDERLINE_OFFSET_NOT_SET) { // if the fontlist contains a bad underline font, make the underline // offset the min of the first valid font and bad font underline offsets uint32_t len = mFonts.Length(); for (uint32_t i = 0; i < len; i++) { FamilyFace& ff = mFonts[i]; if (!ff.IsUserFontContainer() && !ff.FontEntry()->IsUserFont() && ff.Family() && ff.Family()->IsBadUnderlineFamily()) { nsRefPtr font = GetFontAt(i); if (!font) { continue; } gfxFloat bad = font->GetMetrics(gfxFont::eHorizontal). underlineOffset; gfxFloat first = GetFirstValidFont()->GetMetrics(gfxFont::eHorizontal). underlineOffset; mUnderlineOffset = std::min(first, bad); return mUnderlineOffset; } } // no bad underline fonts, use the first valid font's metric mUnderlineOffset = GetFirstValidFont()-> GetMetrics(gfxFont::eHorizontal).underlineOffset; } return mUnderlineOffset; } already_AddRefed gfxFontGroup::FindFontForChar(uint32_t aCh, uint32_t aPrevCh, uint32_t aNextCh, int32_t aRunScript, gfxFont *aPrevMatchedFont, uint8_t *aMatchType) { // If the char is a cluster extender, we want to use the same font // as the preceding character if possible. This is preferable to using // the font group because it avoids breaks in shaping within a cluster. if (aPrevMatchedFont && IsClusterExtender(aCh) && aPrevMatchedFont->HasCharacter(aCh)) { nsRefPtr ret = aPrevMatchedFont; return ret.forget(); } // To optimize common cases, try the first font in the font-group // before going into the more detailed checks below uint32_t nextIndex = 0; bool isJoinControl = gfxFontUtils::IsJoinControl(aCh); bool wasJoinCauser = gfxFontUtils::IsJoinCauser(aPrevCh); bool isVarSelector = gfxFontUtils::IsVarSelector(aCh); if (!isJoinControl && !wasJoinCauser && !isVarSelector) { nsRefPtr firstFont = GetFontAt(0, aCh); if (firstFont) { if (firstFont->HasCharacter(aCh)) { *aMatchType = gfxTextRange::kFontGroup; return firstFont.forget(); } // If italic, test the regular face to see if it supports character. // Only do this for platform fonts, not userfonts. if (mStyle.style != NS_FONT_STYLE_NORMAL && !firstFont->GetFontEntry()->IsUserFont()) { nsRefPtr font = FindNonItalicFaceForChar(mFonts[0].Family(), aCh); if (font) { *aMatchType = gfxTextRange::kFontGroup; return font.forget(); } } } // we don't need to check the first font again below ++nextIndex; } if (aPrevMatchedFont) { // Don't switch fonts for control characters, regardless of // whether they are present in the current font, as they won't // actually be rendered (see bug 716229) if (isJoinControl || GetGeneralCategory(aCh) == HB_UNICODE_GENERAL_CATEGORY_CONTROL) { nsRefPtr ret = aPrevMatchedFont; return ret.forget(); } // if previous character was a join-causer (ZWJ), // use the same font as the previous range if we can if (wasJoinCauser) { if (aPrevMatchedFont->HasCharacter(aCh)) { nsRefPtr ret = aPrevMatchedFont; return ret.forget(); } } } // if this character is a variation selector, // use the previous font regardless of whether it supports VS or not. // otherwise the text run will be divided. if (isVarSelector) { if (aPrevMatchedFont) { nsRefPtr ret = aPrevMatchedFont; return ret.forget(); } // VS alone. it's meaningless to search different fonts return nullptr; } // 1. check remaining fonts in the font group uint32_t fontListLength = mFonts.Length(); for (uint32_t i = nextIndex; i < fontListLength; i++) { FamilyFace& ff = mFonts[i]; if (ff.IsInvalid() || ff.IsLoading()) { continue; } // if available, use already made gfxFont and check for character nsRefPtr font = ff.Font(); if (font) { if (font->HasCharacter(aCh)) { return font.forget(); } continue; } // don't have a gfxFont yet, test before building gfxFontEntry *fe = ff.FontEntry(); if (fe->mIsUserFontContainer) { // for userfonts, need to test both the unicode range map and // the cmap of the platform font entry gfxUserFontEntry* ufe = static_cast(fe); // never match a character outside the defined unicode range if (!ufe->CharacterInUnicodeRange(aCh)) { continue; } // load if not already loaded but only if no other font in similar // range within family is loading if (ufe->LoadState() == gfxUserFontEntry::STATUS_NOT_LOADED && !FontLoadingForFamily(ff.Family(), aCh)) { ufe->Load(); ff.CheckState(mSkipDrawing); } gfxFontEntry* pfe = ufe->GetPlatformFontEntry(); if (pfe && pfe->HasCharacter(aCh)) { font = GetFontAt(i, aCh); if (font) { *aMatchType = gfxTextRange::kFontGroup; return font.forget(); } } } else if (fe->HasCharacter(aCh)) { // for normal platform fonts, after checking the cmap // build the font via GetFontAt font = GetFontAt(i, aCh); if (font) { *aMatchType = gfxTextRange::kFontGroup; return font.forget(); } } // If italic, test the regular face to see if it supports the character. // Only do this for platform fonts, not userfonts. if (mStyle.style != NS_FONT_STYLE_NORMAL && !ff.FontEntry()->IsUserFont()) { font = FindNonItalicFaceForChar(mFonts[i].Family(), aCh); if (font) { *aMatchType = gfxTextRange::kFontGroup; return font.forget(); } } } if (fontListLength == 0) { nsRefPtr defaultFont = GetDefaultFont(); if (defaultFont->HasCharacter(aCh)) { *aMatchType = gfxTextRange::kFontGroup; return defaultFont.forget(); } } // if character is in Private Use Area, don't do matching against pref or system fonts if ((aCh >= 0xE000 && aCh <= 0xF8FF) || (aCh >= 0xF0000 && aCh <= 0x10FFFD)) return nullptr; // 2. search pref fonts nsRefPtr font = WhichPrefFontSupportsChar(aCh); if (font) { *aMatchType = gfxTextRange::kPrefsFallback; return font.forget(); } // 3. use fallback fonts // -- before searching for something else check the font used for the previous character if (aPrevMatchedFont && aPrevMatchedFont->HasCharacter(aCh)) { *aMatchType = gfxTextRange::kSystemFallback; nsRefPtr ret = aPrevMatchedFont; return ret.forget(); } // never fall back for characters from unknown scripts if (aRunScript == HB_SCRIPT_UNKNOWN) { return nullptr; } // for known "space" characters, don't do a full system-fallback search; // we'll synthesize appropriate-width spaces instead of missing-glyph boxes if (GetGeneralCategory(aCh) == HB_UNICODE_GENERAL_CATEGORY_SPACE_SEPARATOR && GetFirstValidFont()->SynthesizeSpaceWidth(aCh) >= 0.0) { return nullptr; } // -- otherwise look for other stuff *aMatchType = gfxTextRange::kSystemFallback; font = WhichSystemFontSupportsChar(aCh, aNextCh, aRunScript); return font.forget(); } template void gfxFontGroup::ComputeRanges(nsTArray& aRanges, const T *aString, uint32_t aLength, int32_t aRunScript, uint16_t aOrientation) { NS_ASSERTION(aRanges.Length() == 0, "aRanges must be initially empty"); NS_ASSERTION(aLength > 0, "don't call ComputeRanges for zero-length text"); uint32_t prevCh = 0; uint32_t nextCh = aString[0]; if (sizeof(T) == sizeof(char16_t)) { if (aLength > 1 && NS_IS_HIGH_SURROGATE(nextCh) && NS_IS_LOW_SURROGATE(aString[1])) { nextCh = SURROGATE_TO_UCS4(nextCh, aString[1]); } } int32_t lastRangeIndex = -1; // initialize prevFont to the group's primary font, so that this will be // used for string-initial control chars, etc rather than risk hitting font // fallback for these (bug 716229) gfxFont *prevFont = GetFirstValidFont(); // if we use the initial value of prevFont, we treat this as a match from // the font group; fixes bug 978313 uint8_t matchType = gfxTextRange::kFontGroup; for (uint32_t i = 0; i < aLength; i++) { const uint32_t origI = i; // save off in case we increase for surrogate // set up current ch uint32_t ch = nextCh; // Get next char (if any) so that FindFontForChar can look ahead // for a possible variation selector. if (sizeof(T) == sizeof(char16_t)) { // In 16-bit case only, check for surrogate pairs. if (ch > 0xffffu) { i++; } if (i < aLength - 1) { nextCh = aString[i + 1]; if ((i + 2 < aLength) && NS_IS_HIGH_SURROGATE(nextCh) && NS_IS_LOW_SURROGATE(aString[i + 2])) { nextCh = SURROGATE_TO_UCS4(nextCh, aString[i + 2]); } } else { nextCh = 0; } } else { // 8-bit case is trivial. nextCh = i < aLength - 1 ? aString[i + 1] : 0; } if (ch == 0xa0) { ch = ' '; } // find the font for this char nsRefPtr font = FindFontForChar(ch, prevCh, nextCh, aRunScript, prevFont, &matchType); #ifndef RELEASE_BUILD if (MOZ_UNLIKELY(mTextPerf)) { if (matchType == gfxTextRange::kPrefsFallback) { mTextPerf->current.fallbackPrefs++; } else if (matchType == gfxTextRange::kSystemFallback) { mTextPerf->current.fallbackSystem++; } } #endif prevCh = ch; uint16_t orient = aOrientation; if (aOrientation == gfxTextRunFactory::TEXT_ORIENT_VERTICAL_MIXED) { // For CSS text-orientation:mixed, we need to resolve orientation // on a per-character basis using the UTR50 orientation property. switch (GetVerticalOrientation(ch)) { case VERTICAL_ORIENTATION_U: case VERTICAL_ORIENTATION_Tr: case VERTICAL_ORIENTATION_Tu: orient = TEXT_ORIENT_VERTICAL_UPRIGHT; break; case VERTICAL_ORIENTATION_R: orient = TEXT_ORIENT_VERTICAL_SIDEWAYS_RIGHT; break; } } if (lastRangeIndex == -1) { // first char ==> make a new range aRanges.AppendElement(gfxTextRange(0, 1, font, matchType, orient)); lastRangeIndex++; prevFont = font; } else { // if font has changed, make a new range gfxTextRange& prevRange = aRanges[lastRangeIndex]; if (prevRange.font != font || prevRange.matchType != matchType || prevRange.orientation != orient) { // close out the previous range prevRange.end = origI; aRanges.AppendElement(gfxTextRange(origI, i + 1, font, matchType, orient)); lastRangeIndex++; // update prevFont for the next match, *unless* we switched // fonts on a ZWJ, in which case propagating the changed font // is probably not a good idea (see bug 619511) if (sizeof(T) == sizeof(uint8_t) || !gfxFontUtils::IsJoinCauser(ch)) { prevFont = font; } } } } aRanges[lastRangeIndex].end = aLength; #if 0 // dump out font matching info if (mStyle.systemFont) return; for (size_t i = 0, i_end = aRanges.Length(); i < i_end; i++) { const gfxTextRange& r = aRanges[i]; printf("fontmatch %zd:%zd font: %s (%d)\n", r.start, r.end, (r.font.get() ? NS_ConvertUTF16toUTF8(r.font->GetName()).get() : ""), r.matchType); } #endif } gfxUserFontSet* gfxFontGroup::GetUserFontSet() { return mUserFontSet; } void gfxFontGroup::SetUserFontSet(gfxUserFontSet *aUserFontSet) { if (aUserFontSet == mUserFontSet) { return; } mUserFontSet = aUserFontSet; mCurrGeneration = GetGeneration() - 1; UpdateUserFonts(); } uint64_t gfxFontGroup::GetGeneration() { if (!mUserFontSet) return 0; return mUserFontSet->GetGeneration(); } uint64_t gfxFontGroup::GetRebuildGeneration() { if (!mUserFontSet) return 0; return mUserFontSet->GetRebuildGeneration(); } // note: gfxPangoFontGroup overrides UpdateUserFonts, such that // BuildFontList is never used void gfxFontGroup::UpdateUserFonts() { if (mCurrGeneration < GetRebuildGeneration()) { // fonts in userfont set changed, need to redo the fontlist mFonts.Clear(); mUnderlineOffset = UNDERLINE_OFFSET_NOT_SET; mSkipDrawing = false; BuildFontList(); mCurrGeneration = GetGeneration(); mCachedEllipsisTextRun = nullptr; } else if (mCurrGeneration != GetGeneration()) { // load state change occurred, verify load state and validity of fonts mSkipDrawing = false; mUnderlineOffset = UNDERLINE_OFFSET_NOT_SET; mCachedEllipsisTextRun = nullptr; uint32_t len = mFonts.Length(); for (uint32_t i = 0; i < len; i++) { FamilyFace& ff = mFonts[i]; if (ff.Font() || !ff.IsUserFontContainer()) { continue; } ff.CheckState(mSkipDrawing); } mCurrGeneration = GetGeneration(); } } struct PrefFontCallbackData { explicit PrefFontCallbackData(nsTArray >& aFamiliesArray) : mPrefFamilies(aFamiliesArray) {} nsTArray >& mPrefFamilies; static bool AddFontFamilyEntry(eFontPrefLang aLang, const nsAString& aName, void *aClosure) { PrefFontCallbackData *prefFontData = static_cast(aClosure); gfxFontFamily *family = gfxPlatformFontList::PlatformFontList()->FindFamily(aName); if (family) { prefFontData->mPrefFamilies.AppendElement(family); } return true; } }; already_AddRefed gfxFontGroup::WhichPrefFontSupportsChar(uint32_t aCh) { nsRefPtr font; // get the pref font list if it hasn't been set up already uint32_t unicodeRange = FindCharUnicodeRange(aCh); eFontPrefLang charLang = gfxPlatform::GetPlatform()->GetFontPrefLangFor(unicodeRange); // if the last pref font was the first family in the pref list, no need to recheck through a list of families if (mLastPrefFont && charLang == mLastPrefLang && mLastPrefFirstFont && mLastPrefFont->HasCharacter(aCh)) { font = mLastPrefFont; return font.forget(); } // based on char lang and page lang, set up list of pref lang fonts to check eFontPrefLang prefLangs[kMaxLenPrefLangList]; uint32_t i, numLangs = 0; gfxPlatform::GetPlatform()->GetLangPrefs(prefLangs, numLangs, charLang, mPageLang); for (i = 0; i < numLangs; i++) { nsAutoTArray, 5> families; eFontPrefLang currentLang = prefLangs[i]; gfxPlatformFontList *fontList = gfxPlatformFontList::PlatformFontList(); // get the pref families for a single pref lang if (!fontList->GetPrefFontFamilyEntries(currentLang, &families)) { eFontPrefLang prefLangsToSearch[1] = { currentLang }; PrefFontCallbackData prefFontData(families); gfxPlatform::ForEachPrefFont(prefLangsToSearch, 1, PrefFontCallbackData::AddFontFamilyEntry, &prefFontData); fontList->SetPrefFontFamilyEntries(currentLang, families); } // find the first pref font that includes the character uint32_t j, numPrefs; numPrefs = families.Length(); for (j = 0; j < numPrefs; j++) { // look up the appropriate face gfxFontFamily *family = families[j]; if (!family) continue; // if a pref font is used, it's likely to be used again in the same text run. // the style doesn't change so the face lookup can be cached rather than calling // FindOrMakeFont repeatedly. speeds up FindFontForChar lookup times for subsequent // pref font lookups if (family == mLastPrefFamily && mLastPrefFont->HasCharacter(aCh)) { font = mLastPrefFont; return font.forget(); } bool needsBold; gfxFontEntry *fe = family->FindFontForStyle(mStyle, needsBold); // if ch in cmap, create and return a gfxFont if (fe && fe->HasCharacter(aCh)) { nsRefPtr prefFont = fe->FindOrMakeFont(&mStyle, needsBold); if (!prefFont) continue; mLastPrefFamily = family; mLastPrefFont = prefFont; mLastPrefLang = charLang; mLastPrefFirstFont = (i == 0 && j == 0); return prefFont.forget(); } } } return nullptr; } already_AddRefed gfxFontGroup::WhichSystemFontSupportsChar(uint32_t aCh, uint32_t aNextCh, int32_t aRunScript) { gfxFontEntry *fe = gfxPlatformFontList::PlatformFontList()-> SystemFindFontForChar(aCh, aNextCh, aRunScript, &mStyle); if (fe) { bool wantBold = mStyle.ComputeWeight() >= 6; nsRefPtr font = fe->FindOrMakeFont(&mStyle, wantBold && !fe->IsBold()); return font.forget(); } return nullptr; } /*static*/ void gfxFontGroup::Shutdown() { NS_IF_RELEASE(gLangService); } nsILanguageAtomService* gfxFontGroup::gLangService = nullptr; void gfxMissingFontRecorder::Flush() { static bool mNotifiedFontsInitialized = false; static uint32_t mNotifiedFonts[gfxMissingFontRecorder::kNumScriptBitsWords]; if (!mNotifiedFontsInitialized) { memset(&mNotifiedFonts, 0, sizeof(mNotifiedFonts)); mNotifiedFontsInitialized = true; } nsAutoString fontNeeded; for (uint32_t i = 0; i < kNumScriptBitsWords; ++i) { mMissingFonts[i] &= ~mNotifiedFonts[i]; if (!mMissingFonts[i]) { continue; } for (uint32_t j = 0; j < 32; ++j) { if (!(mMissingFonts[i] & (1 << j))) { continue; } mNotifiedFonts[i] |= (1 << j); if (!fontNeeded.IsEmpty()) { fontNeeded.Append(PRUnichar(',')); } uint32_t tag = GetScriptTagForCode(i * 32 + j); fontNeeded.Append(char16_t(tag >> 24)); fontNeeded.Append(char16_t((tag >> 16) & 0xff)); fontNeeded.Append(char16_t((tag >> 8) & 0xff)); fontNeeded.Append(char16_t(tag & 0xff)); } mMissingFonts[i] = 0; } if (!fontNeeded.IsEmpty()) { nsCOMPtr service = GetObserverService(); service->NotifyObservers(nullptr, "font-needed", fontNeeded.get()); } }