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gecko-dev/gfx/thebes/gfxTextRun.cpp

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/* -*- 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 "mozilla/Snprintf.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 "mozilla/gfx/Logging.h" // for gfxCriticalError
#if defined(MOZ_WIDGET_GTK)
#include "gfxPlatformGtk.h" // xxx - for UseFcFontList
#endif
#ifdef XP_WIN
#include "gfxWindowsPlatform.h"
#endif
#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 = 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<char*>(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<CompressedGlyph*>(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.
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<PropertyProvider::Spacing> *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<PropertyProvider::Spacing,200> 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)
, mAlpha(0.0)
{
}
~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;
}
// 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());
}
// 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();
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<PropertyProvider::Spacing,200> 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<uint32_t>(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,
aBoundingBoxType, aRefContext, aProvider);
if (trimmableChars) {
Metrics trimMetrics =
MeasureText(aStart + charsFit - trimmableChars,
trimmableChars, aBoundingBoxType,
aRefContext, aProvider);
aMetrics->mAdvanceWidth -= trimMetrics.mAdvanceWidth;
}
}
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<PropertyProvider::Spacing,200> 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<GlyphRun> 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
GlyphRun *prevRun = nullptr;
#endif
while (iter.NextRun()) {
gfxFont *font = iter.GetGlyphRun()->mFont;
NS_ASSERTION(!prevRun || prevRun->mFont != iter.GetGlyphRun()->mFont ||
prevRun->mMatchType != iter.GetGlyphRun()->mMatchType ||
prevRun->mOrientation != iter.GetGlyphRun()->mOrientation,
"Glyphruns not coalesced?");
#ifdef DEBUG
prevRun = iter.GetGlyphRun();
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,<p style="font-family:helvetica, arial, sans-serif;">
// &%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<char*>(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) ||
MOZ_UNLIKELY(font->GetStyle()->sizeAdjust == 0.0f)) {
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];
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,
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,
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.ShallowSizeOfExcludingThis(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,
gfxTextPerfMetrics* aTextPerf,
gfxUserFontSet *aUserFontSet)
: mFamilyList(aFontFamilyList)
, mStyle(*aStyle)
, mUnderlineOffset(UNDERLINE_OFFSET_NOT_SET)
, mHyphenWidth(-1)
, mUserFontSet(aUserFontSet)
, mTextPerf(aTextPerf)
, mPageLang(gfxPlatform::GetFontPrefLangFor(aStyle->language))
, mSkipDrawing(false)
, mSkipUpdateUserFonts(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<nsString, 5> 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<nsString>& 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<FontFamilyName>& 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()
{
bool enumerateFonts = true;
#if defined(MOZ_WIDGET_GTK)
// xxx - eliminate this once gfxPangoFontGroup is no longer needed
enumerateFonts = gfxPlatformGtk::UseFcFontList();
#elif defined(MOZ_WIDGET_QT)
enumerateFonts = false;
#endif
if (enumerateFonts) {
EnumerateFontList(mStyle.language);
}
}
void
gfxFontGroup::FindPlatformFont(const nsAString& aName,
bool aUseFontSet,
void *aClosure)
{
bool needsBold;
gfxFontFamily *family = 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);
}
}
// Not known in the user font set ==> check system fonts
if (!family) {
gfxPlatformFontList *fontList = gfxPlatformFontList::PlatformFontList();
family = fontList->FindFamily(aName, mStyle.language, mStyle.systemFont);
}
// if family found, do style matching and add all font entries to mFonts
if (family) {
nsAutoTArray<gfxFontEntry*,4> fontEntryList;
family->FindAllFontsForStyle(mStyle, fontEntryList, needsBold);
// add these to the fontlist
uint32_t n = fontEntryList.Length();
for (uint32_t i = 0; i < n; i++) {
gfxFontEntry* fe = fontEntryList[i];
if (!HasFont(fe)) {
FamilyFace ff(family, fe, needsBold);
if (fe->mIsUserFontContainer) {
ff.CheckState(mSkipDrawing);
}
mFonts.AppendElement(ff);
}
}
}
}
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<gfxFont> font = ff.Font();
if (!font) {
gfxFontEntry* fe = mFonts[i].FontEntry();
gfxCharacterMap* unicodeRangeMap = nullptr;
if (fe->mIsUserFontContainer) {
gfxUserFontEntry* ufe = static_cast<gfxUserFontEntry*>(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<gfxUserFontEntry*>(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::FamilyFace::EqualsUserFont(const gfxUserFontEntry* aUserFont) const
{
gfxFontEntry* fe = FontEntry();
// if there's a font, the entry is the underlying platform font
if (mFontCreated) {
gfxFontEntry* pfe = aUserFont->GetPlatformFontEntry();
if (pfe == fe) {
return true;
}
} else if (fe == aUserFont) {
return true;
}
return false;
}
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<gfxUserFontEntry*>(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);
}
}
uint32_t numInits, loaderState;
pfl->GetFontlistInitInfo(numInits, loaderState);
NS_ASSERTION(numInits != 0,
"must initialize system fontlist before getting default font!");
uint32_t numFonts = 0;
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<nsRefPtr<gfxFontFamily>,200> familyList;
pfl->GetFontFamilyList(familyList);
numFonts = familyList.Length();
for (uint32_t i = 0; i < numFonts; ++i) {
gfxFontEntry *fe = familyList[i]->FindFontForStyle(mStyle,
needsBold);
if (fe) {
mDefaultFont = fe->FindOrMakeFont(&mStyle, needsBold);
if (mDefaultFont) {
break;
}
}
}
}
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
// annotate crash report with fontlist info
nsAutoCString fontInitInfo;
fontInitInfo.AppendPrintf("no fonts - init: %d fonts: %d loader: %d",
numInits, numFonts, loaderState);
#ifdef XP_WIN
bool dwriteEnabled = gfxWindowsPlatform::GetPlatform()->DWriteEnabled();
double upTime = (double) GetTickCount();
fontInitInfo.AppendPrintf(" backend: %s system-uptime: %9.3f sec",
dwriteEnabled ? "directwrite" : "gdi", upTime/1000);
#endif
gfxCriticalError() << fontInitInfo.get();
char msg[256]; // CHECK buffer length if revising message below
nsAutoString familiesString;
mFamilyList.ToString(familiesString);
snprintf_literal(msg, "unable to find a usable font (%.220s)",
NS_ConvertUTF16toUTF8(familiesString).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<gfxUserFontEntry*>(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, mTextPerf, mUserFontSet);
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) ||
MOZ_UNLIKELY(GetStyle()->sizeAdjust == 0.0f)) {
// 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 <space> (bug 970891),
// find one that does.
uint8_t matchType;
nsRefPtr<gfxFont> 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<gfxContext> ctx(aProvider->GetContext());
if (ctx) {
nsAutoPtr<gfxTextRun>
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 (MOZ_UNLIKELY(GetStyle()->size == 0) ||
MOZ_UNLIKELY(GetStyle()->sizeAdjust == 0.0f)) {
// 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 (MOZ_UNLIKELY(GetStyle()->size == 0) ||
MOZ_UNLIKELY(GetStyle()->sizeAdjust == 0.0f)) {
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<typename T>
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<char16_t> 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);
}
}
PRLogModuleInfo *log = (mStyle.systemFont ?
gfxPlatform::GetLog(eGfxLog_textrunui) :
gfxPlatform::GetLog(eGfxLog_textrun));
// variant fallback handling may end up passing through this twice
bool redo;
do {
redo = false;
if (sizeof(T) == sizeof(uint8_t) && !transformedString) {
if (MOZ_UNLIKELY(MOZ_LOG_TEST(log, LogLevel::Warning))) {
nsAutoCString lang;
mStyle.language->ToUTF8String(lang);
nsAutoString families;
mFamilyList.ToString(families);
nsAutoCString str((const char*)aString, aLength);
MOZ_LOG(log, LogLevel::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()));
}
// 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<const char16_t*>(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)) {
if (MOZ_UNLIKELY(MOZ_LOG_TEST(log, LogLevel::Warning))) {
nsAutoCString lang;
mStyle.language->ToUTF8String(lang);
nsAutoString families;
mFamilyList.ToString(families);
uint32_t runLen = runLimit - runStart;
MOZ_LOG(log, LogLevel::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()));
}
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<typename T>
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");
// confirm the load state of userfonts in the list
if (!mSkipUpdateUserFonts && mUserFontSet &&
mCurrGeneration != mUserFontSet->GetGeneration()) {
UpdateUserFonts();
}
gfxFont *mainFont = GetFirstValidFont();
uint32_t runStart = 0;
nsAutoTArray<gfxTextRange,3> 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<gfxFont> 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, uint32_t aFlags,
LazyReferenceContextGetter& aRefContextGetter)
{
MOZ_ASSERT(!(aFlags & ~TEXT_ORIENT_MASK),
"flags here should only be used to specify orientation");
if (mCachedEllipsisTextRun &&
(mCachedEllipsisTextRun->GetFlags() & TEXT_ORIENT_MASK) == aFlags &&
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<gfxContext> refCtx = aRefContextGetter.GetRefContext();
Parameters params = {
refCtx, nullptr, nullptr, nullptr, 0, aAppUnitsPerDevPixel
};
gfxTextRun* textRun =
MakeTextRun(ellipsis.get(), ellipsis.Length(), &params,
aFlags | 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<gfxFont>
gfxFontGroup::FindNonItalicFaceForChar(gfxFontFamily* aFamily, uint32_t aCh)
{
NS_ASSERTION(mStyle.style != NS_FONT_STYLE_NORMAL,
"should only be called in the italic/oblique case");
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<gfxFont> font = fe->FindOrMakeFont(&mStyle, needsBold);
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<gfxFont> 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<gfxFont>
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<gfxFont> 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<gfxFont> 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<gfxFont> 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<gfxFont> 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<gfxFont> 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<gfxFont> 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<gfxFont> 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<gfxUserFontEntry*>(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.
fe = ff.FontEntry();
if (mStyle.style != NS_FONT_STYLE_NORMAL &&
!fe->mIsUserFontContainer &&
!fe->IsUserFont()) {
font = FindNonItalicFaceForChar(ff.Family(), aCh);
if (font) {
*aMatchType = gfxTextRange::kFontGroup;
return font.forget();
}
}
}
if (fontListLength == 0) {
nsRefPtr<gfxFont> 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<gfxFont> 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<gfxFont> 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<typename T>
void gfxFontGroup::ComputeRanges(nsTArray<gfxTextRange>& 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<gfxFont> 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;
#ifndef RELEASE_BUILD
PRLogModuleInfo *log = (mStyle.systemFont ?
gfxPlatform::GetLog(eGfxLog_textrunui) :
gfxPlatform::GetLog(eGfxLog_textrun));
if (MOZ_UNLIKELY(MOZ_LOG_TEST(log, LogLevel::Debug))) {
nsAutoCString lang;
mStyle.language->ToUTF8String(lang);
nsAutoString families;
mFamilyList.ToString(families);
// collect the font matched for each range
nsAutoCString fontMatches;
for (size_t i = 0, i_end = aRanges.Length(); i < i_end; i++) {
const gfxTextRange& r = aRanges[i];
fontMatches.AppendPrintf(" [%u:%u] %.200s (%s)", r.start, r.end,
(r.font.get() ?
NS_ConvertUTF16toUTF8(r.font->GetName()).get() : "<null>"),
(r.matchType == gfxTextRange::kFontGroup ?
"list" :
(r.matchType == gfxTextRange::kPrefsFallback) ?
"prefs" : "sys"));
}
MOZ_LOG(log, LogLevel::Debug,\
("(%s-fontmatching) fontgroup: [%s] default: %s lang: %s script: %d"
"%s\n",
(mStyle.systemFont ? "textrunui" : "textrun"),
NS_ConvertUTF16toUTF8(families).get(),
(mFamilyList.GetDefaultFontType() == eFamily_serif ?
"serif" :
(mFamilyList.GetDefaultFontType() == eFamily_sans_serif ?
"sans-serif" : "none")),
lang.get(), aRunScript,
fontMatches.get()));
}
#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();
}
}
bool
gfxFontGroup::ContainsUserFont(const gfxUserFontEntry* aUserFont)
{
UpdateUserFonts();
// search through the fonts list for a specific user font
uint32_t len = mFonts.Length();
for (uint32_t i = 0; i < len; i++) {
FamilyFace& ff = mFonts[i];
if (ff.EqualsUserFont(aUserFont)) {
return true;
}
}
return false;
}
struct PrefFontCallbackData {
explicit PrefFontCallbackData(nsTArray<nsRefPtr<gfxFontFamily> >& aFamiliesArray)
: mPrefFamilies(aFamiliesArray)
{}
nsTArray<nsRefPtr<gfxFontFamily> >& mPrefFamilies;
static bool AddFontFamilyEntry(eFontPrefLang aLang, const nsAString& aName, void *aClosure)
{
PrefFontCallbackData *prefFontData = static_cast<PrefFontCallbackData*>(aClosure);
// map pref lang to langGroup for language-sensitive lookups
nsIAtom* lang = gfxPlatform::GetLangGroupForPrefLang(aLang);
gfxFontFamily *family =
gfxPlatformFontList::PlatformFontList()->FindFamily(aName, lang);
if (family) {
prefFontData->mPrefFamilies.AppendElement(family);
}
return true;
}
};
already_AddRefed<gfxFont>
gfxFontGroup::WhichPrefFontSupportsChar(uint32_t aCh)
{
nsRefPtr<gfxFont> 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<nsRefPtr<gfxFontFamily>, 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<gfxFont> 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<gfxFont>
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<gfxFont> 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(char16_t(','));
}
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<nsIObserverService> service = GetObserverService();
service->NotifyObservers(nullptr, "font-needed", fontNeeded.get());
}
}
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