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Bug 961558 - add fallback support for font-variant-caps values. r=jfkthame

This commit is contained in:
John Daggett 2014-06-23 12:09:16 +09:00
Родитель 516d813bbb
Коммит b69e91abce
6 изменённых файлов: 296 добавлений и 113 удалений
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39
gfx/src/nsFont.cpp
Просмотреть файл

@ -275,38 +275,13 @@ void nsFont::AddFontFeaturesToStyle(gfxFontStyle *aStyle) const
aStyle->featureValueLookup = featureValueLookup;
// -- caps
setting.mValue = 1;
switch (variantCaps) {
case NS_FONT_VARIANT_CAPS_ALLSMALL:
setting.mTag = TRUETYPE_TAG('c','2','s','c');
aStyle->featureSettings.AppendElement(setting);
// fall through to the small-caps case
case NS_FONT_VARIANT_CAPS_SMALLCAPS:
setting.mTag = TRUETYPE_TAG('s','m','c','p');
aStyle->featureSettings.AppendElement(setting);
break;
case NS_FONT_VARIANT_CAPS_ALLPETITE:
setting.mTag = TRUETYPE_TAG('c','2','p','c');
aStyle->featureSettings.AppendElement(setting);
// fall through to the petite-caps case
case NS_FONT_VARIANT_CAPS_PETITECAPS:
setting.mTag = TRUETYPE_TAG('p','c','a','p');
aStyle->featureSettings.AppendElement(setting);
break;
case NS_FONT_VARIANT_CAPS_TITLING:
setting.mTag = TRUETYPE_TAG('t','i','t','l');
aStyle->featureSettings.AppendElement(setting);
break;
case NS_FONT_VARIANT_CAPS_UNICASE:
setting.mTag = TRUETYPE_TAG('u','n','i','c');
aStyle->featureSettings.AppendElement(setting);
break;
default:
break;
// passed into gfxFontStyle to deal with appropriate fallback.
// for now, font-variant setting overrides font-variant-caps
// when font-variant becomes a shorthand, this will be removed
if (variant == NS_FONT_VARIANT_SMALL_CAPS) {
aStyle->variantCaps = NS_FONT_VARIANT_CAPS_SMALLCAPS;
} else {
aStyle->variantCaps = variantCaps;
}
// -- east-asian

270
gfx/thebes/gfxFont.cpp
Просмотреть файл

@ -125,7 +125,6 @@ gfxFontEntry::gfxFontEntry() :
mHasSpaceFeaturesNonKerning(false),
mSkipDefaultFeatureSpaceCheck(false),
mCheckedForGraphiteTables(false),
mCheckedForGraphiteSmallCaps(false),
mHasCmapTable(false),
mGrFaceInitialized(false),
mCheckedForColorGlyph(false),
@ -159,7 +158,6 @@ gfxFontEntry::gfxFontEntry(const nsAString& aName, bool aIsStandardFace) :
mHasSpaceFeaturesNonKerning(false),
mSkipDefaultFeatureSpaceCheck(false),
mCheckedForGraphiteTables(false),
mCheckedForGraphiteSmallCaps(false),
mHasCmapTable(false),
mGrFaceInitialized(false),
mCheckedForColorGlyph(false),
@ -883,15 +881,36 @@ gfxFontEntry::CheckForGraphiteTables()
mHasGraphiteTables = HasFontTable(TRUETYPE_TAG('S','i','l','f'));
}
#define FEATURE_SCRIPT_MASK 0x000000ff // script index replaces low byte of tag
// check for too many script codes
PR_STATIC_ASSERT(MOZ_NUM_SCRIPT_CODES <= FEATURE_SCRIPT_MASK);
// high-order three bytes of tag with script in low-order byte
#define SCRIPT_FEATURE(s,tag) (((~FEATURE_SCRIPT_MASK) & (tag)) | \
((FEATURE_SCRIPT_MASK) & (s)))
bool
gfxFontEntry::SupportsOpenTypeSmallCaps(int32_t aScript)
gfxFontEntry::SupportsOpenTypeFeature(int32_t aScript, uint32_t aFeatureTag)
{
if (!mSmallCapsSupport) {
mSmallCapsSupport = new nsDataHashtable<nsUint32HashKey,bool>();
if (!mSupportedFeatures) {
mSupportedFeatures = new nsDataHashtable<nsUint32HashKey,bool>();
}
NS_ASSERTION(aFeatureTag == HB_TAG('s','m','c','p') ||
aFeatureTag == HB_TAG('c','2','s','c') ||
aFeatureTag == HB_TAG('p','c','a','p') ||
aFeatureTag == HB_TAG('c','2','p','c'),
"use of unknown feature tag");
// note: graphite feature support uses the last script index
NS_ASSERTION(aScript < FEATURE_SCRIPT_MASK - 1,
"need to bump the size of the feature shift");
uint32_t scriptFeature = SCRIPT_FEATURE(aScript, aFeatureTag);
bool result;
if (mSmallCapsSupport->Get(uint32_t(aScript), &result)) {
if (mSupportedFeatures->Get(scriptFeature, &result)) {
return result;
}
@ -928,7 +947,6 @@ gfxFontEntry::SupportsOpenTypeSmallCaps(int32_t aScript)
// Now check for 'smcp' under the first of those scripts that is present
const hb_tag_t kGSUB = HB_TAG('G','S','U','B');
const hb_tag_t kSMCP = HB_TAG('s','m','c','p');
scriptTag = &scriptTags[0];
while (*scriptTag != HB_TAG_NONE) {
unsigned int scriptIndex;
@ -937,7 +955,7 @@ gfxFontEntry::SupportsOpenTypeSmallCaps(int32_t aScript)
if (hb_ot_layout_language_find_feature(face, kGSUB,
scriptIndex,
HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX,
kSMCP, nullptr)) {
aFeatureTag, nullptr)) {
result = true;
}
break;
@ -948,22 +966,38 @@ gfxFontEntry::SupportsOpenTypeSmallCaps(int32_t aScript)
hb_face_destroy(face);
mSmallCapsSupport->Put(uint32_t(aScript), result);
mSupportedFeatures->Put(scriptFeature, result);
return result;
}
bool
gfxFontEntry::SupportsGraphiteSmallCaps()
gfxFontEntry::SupportsGraphiteFeature(uint32_t aFeatureTag)
{
if (!mCheckedForGraphiteSmallCaps) {
gr_face* face = GetGrFace();
mHasGraphiteSmallCaps =
gr_face_find_fref(face, TRUETYPE_TAG('s','m','c','p')) != nullptr;
ReleaseGrFace(face);
mCheckedForGraphiteSmallCaps = true;
if (!mSupportedFeatures) {
mSupportedFeatures = new nsDataHashtable<nsUint32HashKey,bool>();
}
return mHasGraphiteSmallCaps;
NS_ASSERTION(aFeatureTag == HB_TAG('s','m','c','p') ||
aFeatureTag == HB_TAG('c','2','s','c') ||
aFeatureTag == HB_TAG('p','c','a','p') ||
aFeatureTag == HB_TAG('c','2','p','c'),
"use of unknown feature tag");
// graphite feature check uses the last script slot
uint32_t scriptFeature = SCRIPT_FEATURE(FEATURE_SCRIPT_MASK, aFeatureTag);
bool result;
if (mSupportedFeatures->Get(scriptFeature, &result)) {
return result;
}
gr_face* face = GetGrFace();
result = gr_face_find_fref(face, aFeatureTag) != nullptr;
ReleaseGrFace(face);
mSupportedFeatures->Put(scriptFeature, result);
return result;
}
bool
@ -2091,6 +2125,7 @@ gfxFontShaper::MergeFontFeatures(
const nsTArray<gfxFontFeature>& aFontFeatures,
bool aDisableLigatures,
const nsAString& aFamilyName,
bool aAddSmallCaps,
nsDataHashtable<nsUint32HashKey,uint32_t>& aMergedFeatures)
{
uint32_t numAlts = aStyle->alternateValues.Length();
@ -2102,6 +2137,7 @@ gfxFontShaper::MergeFontFeatures(
aFontFeatures.IsEmpty() &&
!aDisableLigatures &&
!aStyle->smallCaps &&
aStyle->variantCaps == NS_FONT_VARIANT_CAPS_NORMAL &&
numAlts == 0) {
return false;
}
@ -2113,10 +2149,6 @@ gfxFontShaper::MergeFontFeatures(
aMergedFeatures.Put(HB_TAG('c','l','i','g'), 0);
}
if (aStyle->smallCaps) {
aMergedFeatures.Put(HB_TAG('s','m','c','p'), 1);
}
// add feature values from font
uint32_t i, count;
@ -2126,6 +2158,38 @@ gfxFontShaper::MergeFontFeatures(
aMergedFeatures.Put(feature.mTag, feature.mValue);
}
// font-variant-caps - handled here due to the need for fallback handling
// petite caps cases can fallback to appropriate smallcaps
uint32_t variantCaps = aStyle->variantCaps;
switch (variantCaps) {
case NS_FONT_VARIANT_CAPS_ALLSMALL:
aMergedFeatures.Put(HB_TAG('c','2','s','c'), 1);
// fall through to the small-caps case
case NS_FONT_VARIANT_CAPS_SMALLCAPS:
aMergedFeatures.Put(HB_TAG('s','m','c','p'), 1);
break;
case NS_FONT_VARIANT_CAPS_ALLPETITE:
aMergedFeatures.Put(aAddSmallCaps ? HB_TAG('c','2','s','c') :
HB_TAG('c','2','p','c'), 1);
// fall through to the petite-caps case
case NS_FONT_VARIANT_CAPS_PETITECAPS:
aMergedFeatures.Put(aAddSmallCaps ? HB_TAG('s','m','c','p') :
HB_TAG('p','c','a','p'), 1);
break;
case NS_FONT_VARIANT_CAPS_TITLING:
aMergedFeatures.Put(HB_TAG('t','i','t','l'), 1);
break;
case NS_FONT_VARIANT_CAPS_UNICASE:
aMergedFeatures.Put(HB_TAG('u','n','i','c'), 1);
break;
default:
break;
}
// add font-specific feature values from style rules
if (aStyle->featureValueLookup && numAlts > 0) {
nsAutoTArray<gfxFontFeature,4> featureList;
@ -2704,13 +2768,75 @@ gfxFont::SpaceMayParticipateInShaping(int32_t aRunScript)
}
bool
gfxFont::SupportsSmallCaps(int32_t aScript)
gfxFont::SupportsFeature(int32_t aScript, uint32_t aFeatureTag)
{
if (mGraphiteShaper && gfxPlatform::GetPlatform()->UseGraphiteShaping()) {
return GetFontEntry()->SupportsGraphiteSmallCaps();
return GetFontEntry()->SupportsGraphiteFeature(aFeatureTag);
}
return GetFontEntry()->SupportsOpenTypeFeature(aScript, aFeatureTag);
}
bool
gfxFont::SupportsVariantCaps(int32_t aScript,
uint32_t aVariantCaps,
bool& aFallbackToSmallCaps,
bool& aSyntheticLowerToSmallCaps,
bool& aSyntheticUpperToSmallCaps)
{
bool ok = true; // cases without fallback are fine
aFallbackToSmallCaps = false;
aSyntheticLowerToSmallCaps = false;
aSyntheticUpperToSmallCaps = false;
switch (aVariantCaps) {
case NS_FONT_VARIANT_CAPS_SMALLCAPS:
ok = SupportsFeature(aScript, HB_TAG('s','m','c','p'));
if (!ok) {
aSyntheticLowerToSmallCaps = true;
}
break;
case NS_FONT_VARIANT_CAPS_ALLSMALL:
ok = SupportsFeature(aScript, HB_TAG('s','m','c','p')) &&
SupportsFeature(aScript, HB_TAG('c','2','s','c'));
if (!ok) {
aSyntheticLowerToSmallCaps = true;
aSyntheticUpperToSmallCaps = true;
}
break;
case NS_FONT_VARIANT_CAPS_PETITECAPS:
ok = SupportsFeature(aScript, HB_TAG('p','c','a','p'));
if (!ok) {
ok = SupportsFeature(aScript, HB_TAG('s','m','c','p'));
aFallbackToSmallCaps = ok;
}
if (!ok) {
aSyntheticLowerToSmallCaps = true;
}
break;
case NS_FONT_VARIANT_CAPS_ALLPETITE:
ok = SupportsFeature(aScript, HB_TAG('p','c','a','p')) &&
SupportsFeature(aScript, HB_TAG('c','2','p','c'));
if (!ok) {
ok = SupportsFeature(aScript, HB_TAG('s','m','c','p')) &&
SupportsFeature(aScript, HB_TAG('c','2','s','c'));
aFallbackToSmallCaps = ok;
}
if (!ok) {
aSyntheticLowerToSmallCaps = true;
aSyntheticUpperToSmallCaps = true;
}
break;
default:
break;
}
return GetFontEntry()->SupportsOpenTypeSmallCaps(aScript);
NS_ASSERTION(!(ok && (aSyntheticLowerToSmallCaps ||
aSyntheticUpperToSmallCaps)),
"shouldn't use synthetic features if we found real ones");
NS_ASSERTION(!(!ok && aFallbackToSmallCaps),
"if we found a usable fallback, that counts as ok");
return ok;
}
bool
@ -5490,14 +5616,28 @@ gfxFontGroup::InitScriptRun(gfxContext *aContext,
// create the glyph run for this range
if (matchedFont) {
if (mStyle.smallCaps &&
!matchedFont->SupportsSmallCaps(aRunScript)) {
bool needsFakeSmallCaps = false;
bool petiteToSmallCaps = false;
bool syntheticLower = false;
bool syntheticUpper = false;
if (mStyle.smallCaps ||
mStyle.variantCaps != NS_FONT_VARIANT_CAPS_NORMAL) {
needsFakeSmallCaps =
!matchedFont->SupportsVariantCaps(aRunScript,
(mStyle.smallCaps ? NS_FONT_VARIANT_CAPS_SMALLCAPS :
mStyle.variantCaps),
petiteToSmallCaps, syntheticLower, syntheticUpper);
}
if (needsFakeSmallCaps) {
if (!matchedFont->InitFakeSmallCapsRun(aContext, aTextRun,
aString + runStart,
aOffset + runStart,
matchedLength,
range.matchType,
aRunScript)) {
aRunScript,
syntheticLower,
syntheticUpper)) {
matchedFont = nullptr;
}
} else {
@ -5602,12 +5742,15 @@ gfxFont::InitFakeSmallCapsRun(gfxContext *aContext,
uint32_t aOffset,
uint32_t aLength,
uint8_t aMatchType,
int32_t aScript)
int32_t aScript,
bool aSyntheticLower,
bool aSyntheticUpper)
{
NS_ConvertASCIItoUTF16 unicodeString(reinterpret_cast<const char*>(aText),
aLength);
return InitFakeSmallCapsRun(aContext, aTextRun, unicodeString.get(),
aOffset, aLength, aMatchType, aScript);
aOffset, aLength, aMatchType, aScript,
aSyntheticLower, aSyntheticUpper);
}
bool
@ -5617,22 +5760,25 @@ gfxFont::InitFakeSmallCapsRun(gfxContext *aContext,
uint32_t aOffset,
uint32_t aLength,
uint8_t aMatchType,
int32_t aScript)
int32_t aScript,
bool aSyntheticLower,
bool aSyntheticUpper)
{
bool ok = true;
nsRefPtr<gfxFont> smallCapsFont = GetSmallCapsFont();
enum RunCaseState {
kUpperOrCaseless, // will be untouched by font-variant:small-caps
kLowercase, // will be uppercased and reduced
kSpecialUpper // specials: don't shrink, but apply uppercase mapping
enum RunCaseAction {
kNoChange,
kUppercaseReduce,
kUppercase
};
RunCaseState runCase = kUpperOrCaseless;
RunCaseAction runAction = kNoChange;
uint32_t runStart = 0;
for (uint32_t i = 0; i <= aLength; ++i) {
RunCaseState chCase = kUpperOrCaseless;
RunCaseAction chAction = kNoChange;
// Unless we're at the end, figure out what treatment the current
// character will need.
if (i < aLength) {
@ -5644,22 +5790,25 @@ gfxFont::InitFakeSmallCapsRun(gfxContext *aContext,
// Characters that aren't the start of a cluster are ignored here.
// They get added to whatever lowercase/non-lowercase run we're in.
if (IsClusterExtender(ch)) {
chCase = runCase;
chAction = runAction;
} else {
uint32_t ch2 = ToUpperCase(ch);
if (ch != ch2 || mozilla::unicode::SpecialUpper(ch)) {
chCase = kLowercase;
}
else if (mStyle.language == nsGkAtoms::el) {
if (ch != ToUpperCase(ch) || mozilla::unicode::SpecialUpper(ch)) {
// ch is lower case
chAction = (aSyntheticLower ? kUppercaseReduce : kNoChange);
} else if (ch != ToLowerCase(ch)) {
// ch is upper case
chAction = (aSyntheticUpper ? kUppercaseReduce : kNoChange);
if (mStyle.language == nsGkAtoms::el) {
// In Greek, check for characters that will be modified by
// the GreekUpperCase mapping - this catches accented
// capitals where the accent is to be removed (bug 307039).
// These are handled by using the full-size font with the
// uppercasing transform.
mozilla::GreekCasing::State state;
ch2 = mozilla::GreekCasing::UpperCase(ch, state);
if (ch != ch2) {
chCase = kSpecialUpper;
uint32_t ch2 = mozilla::GreekCasing::UpperCase(ch, state);
if (ch != ch2 && !aSyntheticUpper) {
chAction = kUppercase;
}
}
}
}
@ -5670,11 +5819,11 @@ gfxFont::InitFakeSmallCapsRun(gfxContext *aContext,
// and prepare to accumulate a new run.
// Note that we do not look at any source data for offset [i] here,
// as that would be invalid in the case where i==length.
if ((i == aLength || runCase != chCase) && runStart < i) {
if ((i == aLength || runAction != chAction) && runStart < i) {
uint32_t runLength = i - runStart;
gfxFont* f = this;
switch (runCase) {
case kUpperOrCaseless:
switch (runAction) {
case kNoChange:
// just use the current font and the existing string
aTextRun->AddGlyphRun(f, aMatchType, aOffset + runStart, true);
if (!f->SplitAndInitTextRun(aContext, aTextRun,
@ -5685,11 +5834,11 @@ gfxFont::InitFakeSmallCapsRun(gfxContext *aContext,
}
break;
case kLowercase:
// use reduced-size font, fall through to uppercase the text
case kUppercaseReduce:
// use reduced-size font, then fall through to uppercase the text
f = smallCapsFont;
case kSpecialUpper:
case kUppercase:
// apply uppercase transform to the string
nsDependentSubstring origString(aText + runStart, runLength);
nsAutoString convertedString;
@ -5751,7 +5900,7 @@ gfxFont::InitFakeSmallCapsRun(gfxContext *aContext,
}
if (i < aLength) {
runCase = chCase;
runAction = chAction;
}
}
@ -5764,6 +5913,7 @@ gfxFont::GetSmallCapsFont()
gfxFontStyle style(*GetStyle());
style.size *= SMALL_CAPS_SCALE_FACTOR;
style.smallCaps = false;
style.variantCaps = NS_FONT_VARIANT_CAPS_NORMAL;
gfxFontEntry* fe = GetFontEntry();
bool needsBold = style.weight >= 600 && !fe->IsBold();
return fe->FindOrMakeFont(&style, needsBold);
@ -6212,8 +6362,10 @@ gfxFontStyle::gfxFontStyle() :
languageOverride(NO_FONT_LANGUAGE_OVERRIDE),
weight(NS_FONT_WEIGHT_NORMAL), stretch(NS_FONT_STRETCH_NORMAL),
systemFont(true), printerFont(false), useGrayscaleAntialiasing(false),
smallCaps(false), allowSyntheticWeight(true), allowSyntheticStyle(true),
style(NS_FONT_STYLE_NORMAL)
style(NS_FONT_STYLE_NORMAL),
allowSyntheticWeight(true), allowSyntheticStyle(true),
smallCaps(false),
variantCaps(NS_FONT_VARIANT_CAPS_NORMAL)
{
}
@ -6230,10 +6382,11 @@ gfxFontStyle::gfxFontStyle(uint8_t aStyle, uint16_t aWeight, int16_t aStretch,
weight(aWeight), stretch(aStretch),
systemFont(aSystemFont), printerFont(aPrinterFont),
useGrayscaleAntialiasing(false),
smallCaps(aSmallCaps),
style(aStyle),
allowSyntheticWeight(aAllowWeightSynthesis),
allowSyntheticStyle(aAllowStyleSynthesis),
style(aStyle)
smallCaps(aSmallCaps),
variantCaps(NS_FONT_VARIANT_CAPS_NORMAL)
{
MOZ_ASSERT(!mozilla::IsNaN(size));
MOZ_ASSERT(!mozilla::IsNaN(sizeAdjust));
@ -6265,10 +6418,11 @@ gfxFontStyle::gfxFontStyle(const gfxFontStyle& aStyle) :
weight(aStyle.weight), stretch(aStyle.stretch),
systemFont(aStyle.systemFont), printerFont(aStyle.printerFont),
useGrayscaleAntialiasing(aStyle.useGrayscaleAntialiasing),
smallCaps(aStyle.smallCaps),
style(aStyle.style),
allowSyntheticWeight(aStyle.allowSyntheticWeight),
allowSyntheticStyle(aStyle.allowSyntheticStyle),
style(aStyle.style)
smallCaps(aStyle.smallCaps),
variantCaps(aStyle.variantCaps)
{
featureSettings.AppendElements(aStyle.featureSettings);
alternateValues.AppendElements(aStyle.alternateValues);

46
gfx/thebes/gfxFont.h
Просмотреть файл

@ -143,16 +143,20 @@ struct gfxFontStyle {
// Used to imitate -webkit-font-smoothing: antialiased
bool useGrayscaleAntialiasing : 1;
// Font should render as small-caps, using OT feature if available,
// otherwise using a synthetic small-caps implementation
bool smallCaps : 1;
// The style of font (normal, italic, oblique)
uint8_t style : 2;
// Whether synthetic styles are allowed
bool allowSyntheticWeight : 1;
bool allowSyntheticStyle : 1;
// The style of font (normal, italic, oblique)
uint8_t style : 2;
// font-variant small-caps? render with font feature or use synthetic
// xxx - this will be trimmed out once font-variant becomes a shorthand
bool smallCaps : 1;
// caps variant (small-caps, petite-caps, etc.)
// (note: once font features are enabled this will subsume the bool above)
uint8_t variantCaps;
// Return the final adjusted font size for the given aspect ratio.
// Not meant to be called when sizeAdjust = 0.
@ -176,6 +180,7 @@ struct gfxFontStyle {
*reinterpret_cast<const uint64_t*>(&other.size)) &&
(style == other.style) &&
(smallCaps == other.smallCaps) &&
(variantCaps == other.variantCaps) &&
(allowSyntheticWeight == other.allowSyntheticWeight) &&
(allowSyntheticStyle == other.allowSyntheticStyle) &&
(systemFont == other.systemFont) &&
@ -281,8 +286,10 @@ public:
bool IgnoreGDEF() const { return mIgnoreGDEF; }
bool IgnoreGSUB() const { return mIgnoreGSUB; }
bool SupportsOpenTypeSmallCaps(int32_t aScript);
bool SupportsGraphiteSmallCaps();
// whether a feature is supported by the font (limited to a small set
// of features for which some form of fallback needs to be implemented)
bool SupportsOpenTypeFeature(int32_t aScript, uint32_t aFeatureTag);
bool SupportsGraphiteFeature(uint32_t aFeatureTag);
virtual bool IsSymbolFont();
@ -552,8 +559,6 @@ public:
bool mSkipDefaultFeatureSpaceCheck : 1;
bool mHasGraphiteTables : 1;
bool mCheckedForGraphiteTables : 1;
bool mHasGraphiteSmallCaps : 1;
bool mCheckedForGraphiteSmallCaps : 1;
bool mHasCmapTable : 1;
bool mGrFaceInitialized : 1;
bool mCheckedForColorGlyph : 1;
@ -575,7 +580,7 @@ public:
nsTArray<gfxFont*> mFontsUsingSVGGlyphs;
nsAutoPtr<gfxMathTable> mMathTable;
nsTArray<gfxFontFeature> mFeatureSettings;
nsAutoPtr<nsDataHashtable<nsUint32HashKey,bool>> mSmallCapsSupport;
nsAutoPtr<nsDataHashtable<nsUint32HashKey,bool>> mSupportedFeatures;
uint32_t mLanguageOverride;
// Color Layer font support
@ -1493,6 +1498,7 @@ public:
const nsTArray<gfxFontFeature>& aFontFeatures,
bool aDisableLigatures,
const nsAString& aFamilyName,
bool aAddSmallCaps,
nsDataHashtable<nsUint32HashKey,uint32_t>& aMergedFeatures);
protected:
@ -1622,8 +1628,16 @@ public:
return mFontEntry->HasGraphiteTables();
}
// whether the font supports "real" small caps or should fake them
bool SupportsSmallCaps(int32_t aScript);
// whether a feature is supported by the font (limited to a small set
// of features for which some form of fallback needs to be implemented)
bool SupportsFeature(int32_t aScript, uint32_t aFeatureTag);
// whether the font supports "real" small caps, petite caps etc.
// aFallbackToSmallCaps true when petite caps should fallback to small caps
bool SupportsVariantCaps(int32_t aScript, uint32_t aVariantCaps,
bool& aFallbackToSmallCaps,
bool& aSyntheticLowerToSmallCaps,
bool& aSyntheticUpperToSmallCaps);
// Subclasses may choose to look up glyph ids for characters.
// If they do not override this, gfxHarfBuzzShaper will fetch the cmap
@ -1831,7 +1845,9 @@ public:
uint32_t aOffset,
uint32_t aLength,
uint8_t aMatchType,
int32_t aScript);
int32_t aScript,
bool aSyntheticLower,
bool aSyntheticUpper);
bool InitFakeSmallCapsRun(gfxContext *aContext,
gfxTextRun *aTextRun,
@ -1839,7 +1855,9 @@ public:
uint32_t aOffset,
uint32_t aLength,
uint8_t aMatchType,
int32_t aScript);
int32_t aScript,
bool aSyntheticLower,
bool aSyntheticUpper);
// call the (virtual) InitTextRun method to do glyph generation/shaping,
// limiting the length of text passed by processing the run in multiple

24
gfx/thebes/gfxGraphiteShaper.cpp
Просмотреть файл

@ -6,6 +6,7 @@
#include "gfxGraphiteShaper.h"
#include "nsString.h"
#include "gfxContext.h"
#include "gfxFontConstants.h"
#include "graphite2/Font.h"
#include "graphite2/Segment.h"
@ -29,7 +30,7 @@ using namespace mozilla; // for AutoSwap_* types
gfxGraphiteShaper::gfxGraphiteShaper(gfxFont *aFont)
: gfxFontShaper(aFont),
mGrFace(mFont->GetFontEntry()->GetGrFace()),
mGrFont(nullptr)
mGrFont(nullptr), mFallbackToSmallCaps(false)
{
mCallbackData.mFont = aFont;
mCallbackData.mShaper = this;
@ -96,6 +97,8 @@ gfxGraphiteShaper::ShapeText(gfxContext *aContext,
mCallbackData.mContext = aContext;
const gfxFontStyle *style = mFont->GetStyle();
if (!mGrFont) {
if (!mGrFace) {
return false;
@ -116,10 +119,24 @@ gfxGraphiteShaper::ShapeText(gfxContext *aContext,
if (!mGrFont) {
return false;
}
// determine whether petite-caps falls back to small-caps
if (style->variantCaps != NS_FONT_VARIANT_CAPS_NORMAL) {
switch (style->variantCaps) {
case NS_FONT_VARIANT_CAPS_ALLPETITE:
case NS_FONT_VARIANT_CAPS_PETITECAPS:
bool synLower, synUpper;
mFont->SupportsVariantCaps(aScript, style->variantCaps,
mFallbackToSmallCaps, synLower,
synUpper);
break;
default:
break;
}
}
}
gfxFontEntry *entry = mFont->GetFontEntry();
const gfxFontStyle *style = mFont->GetStyle();
uint32_t grLang = 0;
if (style->languageOverride) {
grLang = MakeGraphiteLangTag(style->languageOverride);
@ -132,13 +149,14 @@ gfxGraphiteShaper::ShapeText(gfxContext *aContext,
}
gr_feature_val *grFeatures = gr_face_featureval_for_lang(mGrFace, grLang);
// if style contains font-specific features
nsDataHashtable<nsUint32HashKey,uint32_t> mergedFeatures;
// if style contains font-specific features
if (MergeFontFeatures(style,
mFont->GetFontEntry()->mFeatureSettings,
aShapedText->DisableLigatures(),
mFont->GetFontEntry()->FamilyName(),
mFallbackToSmallCaps,
mergedFeatures))
{
// enumerate result and insert into Graphite feature list

1
gfx/thebes/gfxGraphiteShaper.h
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@ -47,6 +47,7 @@ protected:
};
CallbackData mCallbackData;
bool mFallbackToSmallCaps; // special fallback for the petite-caps case
// Convert HTML 'lang' (BCP47) to Graphite language code
static uint32_t GetGraphiteTagForLang(const nsCString& aLang);

17
gfx/thebes/gfxHarfBuzzShaper.cpp
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@ -5,6 +5,7 @@
#include "nsString.h"
#include "gfxContext.h"
#include "gfxFontConstants.h"
#include "gfxHarfBuzzShaper.h"
#include "gfxFontUtils.h"
#include "nsUnicodeProperties.h"
@ -967,11 +968,27 @@ gfxHarfBuzzShaper::ShapeText(gfxContext *aContext,
nsAutoTArray<hb_feature_t,20> features;
nsDataHashtable<nsUint32HashKey,uint32_t> mergedFeatures;
// determine whether petite-caps falls back to small-caps
bool addSmallCaps = false;
if (style->variantCaps != NS_FONT_VARIANT_CAPS_NORMAL) {
switch (style->variantCaps) {
case NS_FONT_VARIANT_CAPS_ALLPETITE:
case NS_FONT_VARIANT_CAPS_PETITECAPS:
bool synLower, synUpper;
mFont->SupportsVariantCaps(aScript, style->variantCaps,
addSmallCaps, synLower, synUpper);
break;
default:
break;
}
}
gfxFontEntry *entry = mFont->GetFontEntry();
if (MergeFontFeatures(style,
entry->mFeatureSettings,
aShapedText->DisableLigatures(),
entry->FamilyName(),
addSmallCaps,
mergedFeatures))
{
// enumerate result and insert into hb_feature array