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-rw-r--r--gfx/thebes/gfxHarfBuzzShaper.cpp1818
1 files changed, 1818 insertions, 0 deletions
diff --git a/gfx/thebes/gfxHarfBuzzShaper.cpp b/gfx/thebes/gfxHarfBuzzShaper.cpp
new file mode 100644
index 000000000..1f472f88d
--- /dev/null
+++ b/gfx/thebes/gfxHarfBuzzShaper.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 "nsString.h"
+#include "gfxContext.h"
+#include "gfxFontConstants.h"
+#include "gfxHarfBuzzShaper.h"
+#include "gfxFontUtils.h"
+#include "gfxTextRun.h"
+#include "mozilla/Sprintf.h"
+#include "nsUnicodeProperties.h"
+#include "nsUnicodeScriptCodes.h"
+#include "nsUnicodeNormalizer.h"
+
+#include "harfbuzz/hb.h"
+#include "harfbuzz/hb-ot.h"
+
+#if ENABLE_INTL_API // ICU is available: we'll use it for Unicode composition
+ // and decomposition in preference to nsUnicodeNormalizer.
+#include "unicode/unorm.h"
+#include "unicode/utext.h"
+#define MOZ_HB_SHAPER_USE_ICU_NORMALIZATION 1
+static const UNormalizer2 * sNormalizer = nullptr;
+#else
+#undef MOZ_HB_SHAPER_USE_ICU_NORMALIZATION
+#endif
+
+#include <algorithm>
+
+#define FloatToFixed(f) (65536 * (f))
+#define FixedToFloat(f) ((f) * (1.0 / 65536.0))
+// Right shifts of negative (signed) integers are undefined, as are overflows
+// when converting unsigned to negative signed integers.
+// (If speed were an issue we could make some 2's complement assumptions.)
+#define FixedToIntRound(f) ((f) > 0 ? ((32768 + (f)) >> 16) \
+ : -((32767 - (f)) >> 16))
+
+using namespace mozilla; // for AutoSwap_* types
+using namespace mozilla::unicode; // for Unicode property lookup
+
+/*
+ * Creation and destruction; on deletion, release any font tables we're holding
+ */
+
+gfxHarfBuzzShaper::gfxHarfBuzzShaper(gfxFont *aFont)
+ : gfxFontShaper(aFont),
+ mHBFace(aFont->GetFontEntry()->GetHBFace()),
+ mHBFont(nullptr),
+ mKernTable(nullptr),
+ mHmtxTable(nullptr),
+ mVmtxTable(nullptr),
+ mVORGTable(nullptr),
+ mLocaTable(nullptr),
+ mGlyfTable(nullptr),
+ mCmapTable(nullptr),
+ mCmapFormat(-1),
+ mSubtableOffset(0),
+ mUVSTableOffset(0),
+ mNumLongHMetrics(0),
+ mNumLongVMetrics(0),
+ mUseFontGetGlyph(aFont->ProvidesGetGlyph()),
+ mUseFontGlyphWidths(false),
+ mInitialized(false),
+ mVerticalInitialized(false),
+ mLoadedLocaGlyf(false),
+ mLocaLongOffsets(false)
+{
+}
+
+gfxHarfBuzzShaper::~gfxHarfBuzzShaper()
+{
+ if (mCmapTable) {
+ hb_blob_destroy(mCmapTable);
+ }
+ if (mHmtxTable) {
+ hb_blob_destroy(mHmtxTable);
+ }
+ if (mKernTable) {
+ hb_blob_destroy(mKernTable);
+ }
+ if (mVmtxTable) {
+ hb_blob_destroy(mVmtxTable);
+ }
+ if (mVORGTable) {
+ hb_blob_destroy(mVORGTable);
+ }
+ if (mLocaTable) {
+ hb_blob_destroy(mLocaTable);
+ }
+ if (mGlyfTable) {
+ hb_blob_destroy(mGlyfTable);
+ }
+ if (mHBFont) {
+ hb_font_destroy(mHBFont);
+ }
+ if (mHBFace) {
+ hb_face_destroy(mHBFace);
+ }
+}
+
+#define UNICODE_BMP_LIMIT 0x10000
+
+hb_codepoint_t
+gfxHarfBuzzShaper::GetNominalGlyph(hb_codepoint_t unicode) const
+{
+ hb_codepoint_t gid = 0;
+
+ if (mUseFontGetGlyph) {
+ gid = mFont->GetGlyph(unicode, 0);
+ } else {
+ // we only instantiate a harfbuzz shaper if there's a cmap available
+ NS_ASSERTION(mFont->GetFontEntry()->HasCmapTable(),
+ "we cannot be using this font!");
+
+ NS_ASSERTION(mCmapTable && (mCmapFormat > 0) && (mSubtableOffset > 0),
+ "cmap data not correctly set up, expect disaster");
+
+ const uint8_t* data =
+ (const uint8_t*)hb_blob_get_data(mCmapTable, nullptr);
+
+ switch (mCmapFormat) {
+ case 4:
+ gid = unicode < UNICODE_BMP_LIMIT ?
+ gfxFontUtils::MapCharToGlyphFormat4(data + mSubtableOffset,
+ unicode) : 0;
+ break;
+ case 10:
+ gid = gfxFontUtils::MapCharToGlyphFormat10(data + mSubtableOffset,
+ unicode);
+ break;
+ case 12:
+ gid = gfxFontUtils::MapCharToGlyphFormat12(data + mSubtableOffset,
+ unicode);
+ break;
+ default:
+ NS_WARNING("unsupported cmap format, glyphs will be missing");
+ break;
+ }
+ }
+
+ if (!gid) {
+ // if there's no glyph for &nbsp;, just use the space glyph instead
+ if (unicode == 0xA0) {
+ gid = mFont->GetSpaceGlyph();
+ }
+ }
+
+ return gid;
+}
+
+hb_codepoint_t
+gfxHarfBuzzShaper::GetVariationGlyph(hb_codepoint_t unicode,
+ hb_codepoint_t variation_selector) const
+{
+ if (mUseFontGetGlyph) {
+ return mFont->GetGlyph(unicode, variation_selector);
+ }
+
+ NS_ASSERTION(mFont->GetFontEntry()->HasCmapTable(),
+ "we cannot be using this font!");
+ NS_ASSERTION(mCmapTable && (mCmapFormat > 0) && (mSubtableOffset > 0),
+ "cmap data not correctly set up, expect disaster");
+
+ const uint8_t* data =
+ (const uint8_t*)hb_blob_get_data(mCmapTable, nullptr);
+
+ if (mUVSTableOffset) {
+ hb_codepoint_t gid =
+ gfxFontUtils::MapUVSToGlyphFormat14(data + mUVSTableOffset,
+ unicode, variation_selector);
+ if (gid) {
+ return gid;
+ }
+ }
+
+ uint32_t compat =
+ gfxFontUtils::GetUVSFallback(unicode, variation_selector);
+ if (compat) {
+ switch (mCmapFormat) {
+ case 4:
+ if (compat < UNICODE_BMP_LIMIT) {
+ return gfxFontUtils::MapCharToGlyphFormat4(data + mSubtableOffset,
+ compat);
+ }
+ break;
+ case 10:
+ return gfxFontUtils::MapCharToGlyphFormat10(data + mSubtableOffset,
+ compat);
+ break;
+ case 12:
+ return gfxFontUtils::MapCharToGlyphFormat12(data + mSubtableOffset,
+ compat);
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static int
+VertFormsGlyphCompare(const void* aKey, const void* aElem)
+{
+ return int(*((hb_codepoint_t*)(aKey))) - int(*((uint16_t*)(aElem)));
+}
+
+// Return a vertical presentation-form codepoint corresponding to the
+// given Unicode value, or 0 if no such form is available.
+static hb_codepoint_t
+GetVerticalPresentationForm(hb_codepoint_t unicode)
+{
+ static const uint16_t sVerticalForms[][2] = {
+ { 0x2013, 0xfe32 }, // EN DASH
+ { 0x2014, 0xfe31 }, // EM DASH
+ { 0x2025, 0xfe30 }, // TWO DOT LEADER
+ { 0x2026, 0xfe19 }, // HORIZONTAL ELLIPSIS
+ { 0x3001, 0xfe11 }, // IDEOGRAPHIC COMMA
+ { 0x3002, 0xfe12 }, // IDEOGRAPHIC FULL STOP
+ { 0x3008, 0xfe3f }, // LEFT ANGLE BRACKET
+ { 0x3009, 0xfe40 }, // RIGHT ANGLE BRACKET
+ { 0x300a, 0xfe3d }, // LEFT DOUBLE ANGLE BRACKET
+ { 0x300b, 0xfe3e }, // RIGHT DOUBLE ANGLE BRACKET
+ { 0x300c, 0xfe41 }, // LEFT CORNER BRACKET
+ { 0x300d, 0xfe42 }, // RIGHT CORNER BRACKET
+ { 0x300e, 0xfe43 }, // LEFT WHITE CORNER BRACKET
+ { 0x300f, 0xfe44 }, // RIGHT WHITE CORNER BRACKET
+ { 0x3010, 0xfe3b }, // LEFT BLACK LENTICULAR BRACKET
+ { 0x3011, 0xfe3c }, // RIGHT BLACK LENTICULAR BRACKET
+ { 0x3014, 0xfe39 }, // LEFT TORTOISE SHELL BRACKET
+ { 0x3015, 0xfe3a }, // RIGHT TORTOISE SHELL BRACKET
+ { 0x3016, 0xfe17 }, // LEFT WHITE LENTICULAR BRACKET
+ { 0x3017, 0xfe18 }, // RIGHT WHITE LENTICULAR BRACKET
+ { 0xfe4f, 0xfe34 }, // WAVY LOW LINE
+ { 0xff01, 0xfe15 }, // FULLWIDTH EXCLAMATION MARK
+ { 0xff08, 0xfe35 }, // FULLWIDTH LEFT PARENTHESIS
+ { 0xff09, 0xfe36 }, // FULLWIDTH RIGHT PARENTHESIS
+ { 0xff0c, 0xfe10 }, // FULLWIDTH COMMA
+ { 0xff1a, 0xfe13 }, // FULLWIDTH COLON
+ { 0xff1b, 0xfe14 }, // FULLWIDTH SEMICOLON
+ { 0xff1f, 0xfe16 }, // FULLWIDTH QUESTION MARK
+ { 0xff3b, 0xfe47 }, // FULLWIDTH LEFT SQUARE BRACKET
+ { 0xff3d, 0xfe48 }, // FULLWIDTH RIGHT SQUARE BRACKET
+ { 0xff3f, 0xfe33 }, // FULLWIDTH LOW LINE
+ { 0xff5b, 0xfe37 }, // FULLWIDTH LEFT CURLY BRACKET
+ { 0xff5d, 0xfe38 } // FULLWIDTH RIGHT CURLY BRACKET
+ };
+ const uint16_t* charPair =
+ static_cast<const uint16_t*>(bsearch(&unicode,
+ sVerticalForms,
+ ArrayLength(sVerticalForms),
+ sizeof(sVerticalForms[0]),
+ VertFormsGlyphCompare));
+ return charPair ? charPair[1] : 0;
+}
+
+static hb_bool_t
+HBGetNominalGlyph(hb_font_t *font, void *font_data,
+ hb_codepoint_t unicode,
+ hb_codepoint_t *glyph,
+ void *user_data)
+{
+ const gfxHarfBuzzShaper::FontCallbackData *fcd =
+ static_cast<const gfxHarfBuzzShaper::FontCallbackData*>(font_data);
+
+ if (fcd->mShaper->UseVerticalPresentationForms()) {
+ hb_codepoint_t verticalForm = GetVerticalPresentationForm(unicode);
+ if (verticalForm) {
+ *glyph = fcd->mShaper->GetNominalGlyph(verticalForm);
+ if (*glyph != 0) {
+ return true;
+ }
+ }
+ // fall back to the non-vertical form if we didn't find an alternate
+ }
+
+ *glyph = fcd->mShaper->GetNominalGlyph(unicode);
+ return *glyph != 0;
+}
+
+static hb_bool_t
+HBGetVariationGlyph(hb_font_t *font, void *font_data,
+ hb_codepoint_t unicode, hb_codepoint_t variation_selector,
+ hb_codepoint_t *glyph,
+ void *user_data)
+{
+ const gfxHarfBuzzShaper::FontCallbackData *fcd =
+ static_cast<const gfxHarfBuzzShaper::FontCallbackData*>(font_data);
+
+ if (fcd->mShaper->UseVerticalPresentationForms()) {
+ hb_codepoint_t verticalForm = GetVerticalPresentationForm(unicode);
+ if (verticalForm) {
+ *glyph = fcd->mShaper->GetVariationGlyph(verticalForm,
+ variation_selector);
+ if (*glyph != 0) {
+ return true;
+ }
+ }
+ // fall back to the non-vertical form if we didn't find an alternate
+ }
+
+ *glyph = fcd->mShaper->GetVariationGlyph(unicode, variation_selector);
+ return *glyph != 0;
+}
+
+// Glyph metrics structures, shared (with appropriate reinterpretation of
+// field names) by horizontal and vertical metrics tables.
+struct LongMetric {
+ AutoSwap_PRUint16 advanceWidth; // or advanceHeight, when vertical
+ AutoSwap_PRInt16 lsb; // or tsb, when vertical
+};
+
+struct GlyphMetrics {
+ LongMetric metrics[1]; // actually numberOfLongMetrics
+// the variable-length metrics[] array is immediately followed by:
+// AutoSwap_PRUint16 leftSideBearing[];
+};
+
+hb_position_t
+gfxHarfBuzzShaper::GetGlyphHAdvance(hb_codepoint_t glyph) const
+{
+ // font did not implement GetGlyphWidth, so get an unhinted value
+ // directly from the font tables
+
+ NS_ASSERTION((mNumLongHMetrics > 0) && mHmtxTable != nullptr,
+ "font is lacking metrics, we shouldn't be here");
+
+ if (glyph >= uint32_t(mNumLongHMetrics)) {
+ glyph = mNumLongHMetrics - 1;
+ }
+
+ // glyph must be valid now, because we checked during initialization
+ // that mNumLongHMetrics is > 0, and that the metrics table is large enough
+ // to contain mNumLongHMetrics records
+ const GlyphMetrics* metrics =
+ reinterpret_cast<const GlyphMetrics*>(hb_blob_get_data(mHmtxTable,
+ nullptr));
+ return FloatToFixed(mFont->FUnitsToDevUnitsFactor() *
+ uint16_t(metrics->metrics[glyph].advanceWidth));
+}
+
+hb_position_t
+gfxHarfBuzzShaper::GetGlyphVAdvance(hb_codepoint_t glyph) const
+{
+ if (!mVmtxTable) {
+ // Must be a "vertical" font that doesn't actually have vertical metrics;
+ // use a fixed advance.
+ return FloatToFixed(mFont->GetMetrics(gfxFont::eVertical).aveCharWidth);
+ }
+
+ NS_ASSERTION(mNumLongVMetrics > 0,
+ "font is lacking metrics, we shouldn't be here");
+
+ if (glyph >= uint32_t(mNumLongVMetrics)) {
+ glyph = mNumLongVMetrics - 1;
+ }
+
+ // glyph must be valid now, because we checked during initialization
+ // that mNumLongVMetrics is > 0, and that the metrics table is large enough
+ // to contain mNumLongVMetrics records
+ const GlyphMetrics* metrics =
+ reinterpret_cast<const GlyphMetrics*>(hb_blob_get_data(mVmtxTable,
+ nullptr));
+ return FloatToFixed(mFont->FUnitsToDevUnitsFactor() *
+ uint16_t(metrics->metrics[glyph].advanceWidth));
+}
+
+/* static */
+hb_position_t
+gfxHarfBuzzShaper::HBGetGlyphHAdvance(hb_font_t *font, void *font_data,
+ hb_codepoint_t glyph, void *user_data)
+{
+ const gfxHarfBuzzShaper::FontCallbackData *fcd =
+ static_cast<const gfxHarfBuzzShaper::FontCallbackData*>(font_data);
+ gfxFont *gfxfont = fcd->mShaper->GetFont();
+ if (gfxfont->ProvidesGlyphWidths()) {
+ return gfxfont->GetGlyphWidth(*fcd->mDrawTarget, glyph);
+ }
+ return fcd->mShaper->GetGlyphHAdvance(glyph);
+}
+
+/* static */
+hb_position_t
+gfxHarfBuzzShaper::HBGetGlyphVAdvance(hb_font_t *font, void *font_data,
+ hb_codepoint_t glyph, void *user_data)
+{
+ const gfxHarfBuzzShaper::FontCallbackData *fcd =
+ static_cast<const gfxHarfBuzzShaper::FontCallbackData*>(font_data);
+ // Currently, we don't offer gfxFont subclasses a method to override this
+ // and provide hinted platform-specific vertical advances (analogous to the
+ // GetGlyphWidth method for horizontal advances). If that proves necessary,
+ // we'll add a new gfxFont method and call it from here.
+ return fcd->mShaper->GetGlyphVAdvance(glyph);
+}
+
+struct VORG {
+ AutoSwap_PRUint16 majorVersion;
+ AutoSwap_PRUint16 minorVersion;
+ AutoSwap_PRInt16 defaultVertOriginY;
+ AutoSwap_PRUint16 numVertOriginYMetrics;
+};
+
+struct VORGrec {
+ AutoSwap_PRUint16 glyphIndex;
+ AutoSwap_PRInt16 vertOriginY;
+};
+
+/* static */
+hb_bool_t
+gfxHarfBuzzShaper::HBGetGlyphVOrigin(hb_font_t *font, void *font_data,
+ hb_codepoint_t glyph,
+ hb_position_t *x, hb_position_t *y,
+ void *user_data)
+{
+ const gfxHarfBuzzShaper::FontCallbackData *fcd =
+ static_cast<const gfxHarfBuzzShaper::FontCallbackData*>(font_data);
+ fcd->mShaper->GetGlyphVOrigin(glyph, x, y);
+ return true;
+}
+
+void
+gfxHarfBuzzShaper::GetGlyphVOrigin(hb_codepoint_t aGlyph,
+ hb_position_t *aX, hb_position_t *aY) const
+{
+ *aX = -0.5 * GetGlyphHAdvance(aGlyph);
+
+ if (mVORGTable) {
+ // We checked in Initialize() that the VORG table is safely readable,
+ // so no length/bounds-check needed here.
+ const VORG* vorg =
+ reinterpret_cast<const VORG*>(hb_blob_get_data(mVORGTable, nullptr));
+
+ const VORGrec *lo = reinterpret_cast<const VORGrec*>(vorg + 1);
+ const VORGrec *hi = lo + uint16_t(vorg->numVertOriginYMetrics);
+ const VORGrec *limit = hi;
+ while (lo < hi) {
+ const VORGrec *mid = lo + (hi - lo) / 2;
+ if (uint16_t(mid->glyphIndex) < aGlyph) {
+ lo = mid + 1;
+ } else {
+ hi = mid;
+ }
+ }
+
+ if (lo < limit && uint16_t(lo->glyphIndex) == aGlyph) {
+ *aY = -FloatToFixed(GetFont()->FUnitsToDevUnitsFactor() *
+ int16_t(lo->vertOriginY));
+ } else {
+ *aY = -FloatToFixed(GetFont()->FUnitsToDevUnitsFactor() *
+ int16_t(vorg->defaultVertOriginY));
+ }
+ return;
+ }
+
+ if (mVmtxTable) {
+ bool emptyGlyf;
+ const Glyf *glyf = FindGlyf(aGlyph, &emptyGlyf);
+ if (glyf) {
+ if (emptyGlyf) {
+ *aY = 0;
+ return;
+ }
+
+ const GlyphMetrics* metrics =
+ reinterpret_cast<const GlyphMetrics*>
+ (hb_blob_get_data(mVmtxTable, nullptr));
+ int16_t lsb;
+ if (aGlyph < hb_codepoint_t(mNumLongVMetrics)) {
+ // Glyph is covered by the first (advance & sidebearing) array
+ lsb = int16_t(metrics->metrics[aGlyph].lsb);
+ } else {
+ // Glyph is covered by the second (sidebearing-only) array
+ const AutoSwap_PRInt16* sidebearings =
+ reinterpret_cast<const AutoSwap_PRInt16*>
+ (&metrics->metrics[mNumLongVMetrics]);
+ lsb = int16_t(sidebearings[aGlyph - mNumLongVMetrics]);
+ }
+ *aY = -FloatToFixed(mFont->FUnitsToDevUnitsFactor() *
+ (lsb + int16_t(glyf->yMax)));
+ return;
+ } else {
+ // XXX TODO: not a truetype font; need to get glyph extents
+ // via some other API?
+ // For now, fall through to default code below.
+ }
+ }
+
+ // XXX should we consider using OS/2 sTypo* metrics if available?
+
+ gfxFontEntry::AutoTable hheaTable(GetFont()->GetFontEntry(),
+ TRUETYPE_TAG('h','h','e','a'));
+ if (hheaTable) {
+ uint32_t len;
+ const MetricsHeader* hhea =
+ reinterpret_cast<const MetricsHeader*>(hb_blob_get_data(hheaTable,
+ &len));
+ if (len >= sizeof(MetricsHeader)) {
+ // divide up the default advance we're using (1em) in proportion
+ // to ascender:descender from the hhea table
+ int16_t a = int16_t(hhea->ascender);
+ int16_t d = int16_t(hhea->descender);
+ *aY = -FloatToFixed(GetFont()->GetAdjustedSize() * a / (a - d));
+ return;
+ }
+ }
+
+ NS_NOTREACHED("we shouldn't be here!");
+ *aY = -FloatToFixed(GetFont()->GetAdjustedSize() / 2);
+}
+
+static hb_bool_t
+HBGetGlyphExtents(hb_font_t *font, void *font_data,
+ hb_codepoint_t glyph,
+ hb_glyph_extents_t *extents,
+ void *user_data)
+{
+ const gfxHarfBuzzShaper::FontCallbackData *fcd =
+ static_cast<const gfxHarfBuzzShaper::FontCallbackData*>(font_data);
+ return fcd->mShaper->GetGlyphExtents(glyph, extents);
+}
+
+// Find the data for glyph ID |aGlyph| in the 'glyf' table, if present.
+// Returns null if not found, otherwise pointer to the beginning of the
+// glyph's data. Sets aEmptyGlyf true if there is no actual data;
+// otherwise, it's guaranteed that we can read at least the bounding box.
+const gfxHarfBuzzShaper::Glyf*
+gfxHarfBuzzShaper::FindGlyf(hb_codepoint_t aGlyph, bool *aEmptyGlyf) const
+{
+ if (!mLoadedLocaGlyf) {
+ mLoadedLocaGlyf = true; // only try this once; if it fails, this
+ // isn't a truetype font
+ gfxFontEntry *entry = mFont->GetFontEntry();
+ uint32_t len;
+ gfxFontEntry::AutoTable headTable(entry,
+ TRUETYPE_TAG('h','e','a','d'));
+ if (!headTable) {
+ return nullptr;
+ }
+ const HeadTable* head =
+ reinterpret_cast<const HeadTable*>(hb_blob_get_data(headTable,
+ &len));
+ if (len < sizeof(HeadTable)) {
+ return nullptr;
+ }
+ mLocaLongOffsets = int16_t(head->indexToLocFormat) > 0;
+ mLocaTable = entry->GetFontTable(TRUETYPE_TAG('l','o','c','a'));
+ mGlyfTable = entry->GetFontTable(TRUETYPE_TAG('g','l','y','f'));
+ }
+
+ if (!mLocaTable || !mGlyfTable) {
+ // it's not a truetype font
+ return nullptr;
+ }
+
+ uint32_t offset; // offset of glyph record in the 'glyf' table
+ uint32_t len;
+ const char* data = hb_blob_get_data(mLocaTable, &len);
+ if (mLocaLongOffsets) {
+ if ((aGlyph + 1) * sizeof(AutoSwap_PRUint32) > len) {
+ return nullptr;
+ }
+ const AutoSwap_PRUint32* offsets =
+ reinterpret_cast<const AutoSwap_PRUint32*>(data);
+ offset = offsets[aGlyph];
+ *aEmptyGlyf = (offset == uint16_t(offsets[aGlyph + 1]));
+ } else {
+ if ((aGlyph + 1) * sizeof(AutoSwap_PRUint16) > len) {
+ return nullptr;
+ }
+ const AutoSwap_PRUint16* offsets =
+ reinterpret_cast<const AutoSwap_PRUint16*>(data);
+ offset = uint16_t(offsets[aGlyph]);
+ *aEmptyGlyf = (offset == uint16_t(offsets[aGlyph + 1]));
+ offset *= 2;
+ }
+
+ data = hb_blob_get_data(mGlyfTable, &len);
+ if (offset + sizeof(Glyf) > len) {
+ return nullptr;
+ }
+
+ return reinterpret_cast<const Glyf*>(data + offset);
+}
+
+hb_bool_t
+gfxHarfBuzzShaper::GetGlyphExtents(hb_codepoint_t aGlyph,
+ hb_glyph_extents_t *aExtents) const
+{
+ bool emptyGlyf;
+ const Glyf *glyf = FindGlyf(aGlyph, &emptyGlyf);
+ if (!glyf) {
+ // TODO: for non-truetype fonts, get extents some other way?
+ return false;
+ }
+
+ if (emptyGlyf) {
+ aExtents->x_bearing = 0;
+ aExtents->y_bearing = 0;
+ aExtents->width = 0;
+ aExtents->height = 0;
+ return true;
+ }
+
+ double f = mFont->FUnitsToDevUnitsFactor();
+ aExtents->x_bearing = FloatToFixed(int16_t(glyf->xMin) * f);
+ aExtents->width =
+ FloatToFixed((int16_t(glyf->xMax) - int16_t(glyf->xMin)) * f);
+
+ // Our y-coordinates are positive-downwards, whereas harfbuzz assumes
+ // positive-upwards; hence the apparently-reversed subtractions here.
+ aExtents->y_bearing =
+ FloatToFixed(int16_t(glyf->yMax) * f -
+ mFont->GetHorizontalMetrics().emAscent);
+ aExtents->height =
+ FloatToFixed((int16_t(glyf->yMin) - int16_t(glyf->yMax)) * f);
+
+ return true;
+}
+
+static hb_bool_t
+HBGetContourPoint(hb_font_t *font, void *font_data,
+ unsigned int point_index, hb_codepoint_t glyph,
+ hb_position_t *x, hb_position_t *y,
+ void *user_data)
+{
+ /* not yet implemented - no support for used of hinted contour points
+ to fine-tune anchor positions in GPOS AnchorFormat2 */
+ return false;
+}
+
+struct KernHeaderFmt0 {
+ AutoSwap_PRUint16 nPairs;
+ AutoSwap_PRUint16 searchRange;
+ AutoSwap_PRUint16 entrySelector;
+ AutoSwap_PRUint16 rangeShift;
+};
+
+struct KernPair {
+ AutoSwap_PRUint16 left;
+ AutoSwap_PRUint16 right;
+ AutoSwap_PRInt16 value;
+};
+
+// Find a kern pair in a Format 0 subtable.
+// The aSubtable parameter points to the subtable itself, NOT its header,
+// as the header structure differs between Windows and Mac (v0 and v1.0)
+// versions of the 'kern' table.
+// aSubtableLen is the length of the subtable EXCLUDING its header.
+// If the pair <aFirstGlyph,aSecondGlyph> is found, the kerning value is
+// added to aValue, so that multiple subtables can accumulate a total
+// kerning value for a given pair.
+static void
+GetKernValueFmt0(const void* aSubtable,
+ uint32_t aSubtableLen,
+ uint16_t aFirstGlyph,
+ uint16_t aSecondGlyph,
+ int32_t& aValue,
+ bool aIsOverride = false,
+ bool aIsMinimum = false)
+{
+ const KernHeaderFmt0* hdr =
+ reinterpret_cast<const KernHeaderFmt0*>(aSubtable);
+
+ const KernPair *lo = reinterpret_cast<const KernPair*>(hdr + 1);
+ const KernPair *hi = lo + uint16_t(hdr->nPairs);
+ const KernPair *limit = hi;
+
+ if (reinterpret_cast<const char*>(aSubtable) + aSubtableLen <
+ reinterpret_cast<const char*>(hi)) {
+ // subtable is not large enough to contain the claimed number
+ // of kern pairs, so just ignore it
+ return;
+ }
+
+#define KERN_PAIR_KEY(l,r) (uint32_t((uint16_t(l) << 16) + uint16_t(r)))
+
+ uint32_t key = KERN_PAIR_KEY(aFirstGlyph, aSecondGlyph);
+ while (lo < hi) {
+ const KernPair *mid = lo + (hi - lo) / 2;
+ if (KERN_PAIR_KEY(mid->left, mid->right) < key) {
+ lo = mid + 1;
+ } else {
+ hi = mid;
+ }
+ }
+
+ if (lo < limit && KERN_PAIR_KEY(lo->left, lo->right) == key) {
+ if (aIsOverride) {
+ aValue = int16_t(lo->value);
+ } else if (aIsMinimum) {
+ aValue = std::max(aValue, int32_t(lo->value));
+ } else {
+ aValue += int16_t(lo->value);
+ }
+ }
+}
+
+// Get kerning value from Apple (version 1.0) kern table,
+// subtable format 2 (simple N x M array of kerning values)
+
+// See http://developer.apple.com/fonts/TTRefMan/RM06/Chap6kern.html
+// for details of version 1.0 format 2 subtable.
+
+struct KernHeaderVersion1Fmt2 {
+ KernTableSubtableHeaderVersion1 header;
+ AutoSwap_PRUint16 rowWidth;
+ AutoSwap_PRUint16 leftOffsetTable;
+ AutoSwap_PRUint16 rightOffsetTable;
+ AutoSwap_PRUint16 array;
+};
+
+struct KernClassTableHdr {
+ AutoSwap_PRUint16 firstGlyph;
+ AutoSwap_PRUint16 nGlyphs;
+ AutoSwap_PRUint16 offsets[1]; // actually an array of nGlyphs entries
+};
+
+static int16_t
+GetKernValueVersion1Fmt2(const void* aSubtable,
+ uint32_t aSubtableLen,
+ uint16_t aFirstGlyph,
+ uint16_t aSecondGlyph)
+{
+ if (aSubtableLen < sizeof(KernHeaderVersion1Fmt2)) {
+ return 0;
+ }
+
+ const char* base = reinterpret_cast<const char*>(aSubtable);
+ const char* subtableEnd = base + aSubtableLen;
+
+ const KernHeaderVersion1Fmt2* h =
+ reinterpret_cast<const KernHeaderVersion1Fmt2*>(aSubtable);
+ uint32_t offset = h->array;
+
+ const KernClassTableHdr* leftClassTable =
+ reinterpret_cast<const KernClassTableHdr*>(base +
+ uint16_t(h->leftOffsetTable));
+ if (reinterpret_cast<const char*>(leftClassTable) +
+ sizeof(KernClassTableHdr) > subtableEnd) {
+ return 0;
+ }
+ if (aFirstGlyph >= uint16_t(leftClassTable->firstGlyph)) {
+ aFirstGlyph -= uint16_t(leftClassTable->firstGlyph);
+ if (aFirstGlyph < uint16_t(leftClassTable->nGlyphs)) {
+ if (reinterpret_cast<const char*>(leftClassTable) +
+ sizeof(KernClassTableHdr) +
+ aFirstGlyph * sizeof(uint16_t) >= subtableEnd) {
+ return 0;
+ }
+ offset = uint16_t(leftClassTable->offsets[aFirstGlyph]);
+ }
+ }
+
+ const KernClassTableHdr* rightClassTable =
+ reinterpret_cast<const KernClassTableHdr*>(base +
+ uint16_t(h->rightOffsetTable));
+ if (reinterpret_cast<const char*>(rightClassTable) +
+ sizeof(KernClassTableHdr) > subtableEnd) {
+ return 0;
+ }
+ if (aSecondGlyph >= uint16_t(rightClassTable->firstGlyph)) {
+ aSecondGlyph -= uint16_t(rightClassTable->firstGlyph);
+ if (aSecondGlyph < uint16_t(rightClassTable->nGlyphs)) {
+ if (reinterpret_cast<const char*>(rightClassTable) +
+ sizeof(KernClassTableHdr) +
+ aSecondGlyph * sizeof(uint16_t) >= subtableEnd) {
+ return 0;
+ }
+ offset += uint16_t(rightClassTable->offsets[aSecondGlyph]);
+ }
+ }
+
+ const AutoSwap_PRInt16* pval =
+ reinterpret_cast<const AutoSwap_PRInt16*>(base + offset);
+ if (reinterpret_cast<const char*>(pval + 1) >= subtableEnd) {
+ return 0;
+ }
+ return *pval;
+}
+
+// Get kerning value from Apple (version 1.0) kern table,
+// subtable format 3 (simple N x M array of kerning values)
+
+// See http://developer.apple.com/fonts/TTRefMan/RM06/Chap6kern.html
+// for details of version 1.0 format 3 subtable.
+
+struct KernHeaderVersion1Fmt3 {
+ KernTableSubtableHeaderVersion1 header;
+ AutoSwap_PRUint16 glyphCount;
+ uint8_t kernValueCount;
+ uint8_t leftClassCount;
+ uint8_t rightClassCount;
+ uint8_t flags;
+};
+
+static int16_t
+GetKernValueVersion1Fmt3(const void* aSubtable,
+ uint32_t aSubtableLen,
+ uint16_t aFirstGlyph,
+ uint16_t aSecondGlyph)
+{
+ // check that we can safely read the header fields
+ if (aSubtableLen < sizeof(KernHeaderVersion1Fmt3)) {
+ return 0;
+ }
+
+ const KernHeaderVersion1Fmt3* hdr =
+ reinterpret_cast<const KernHeaderVersion1Fmt3*>(aSubtable);
+ if (hdr->flags != 0) {
+ return 0;
+ }
+
+ uint16_t glyphCount = hdr->glyphCount;
+
+ // check that table is large enough for the arrays
+ if (sizeof(KernHeaderVersion1Fmt3) +
+ hdr->kernValueCount * sizeof(int16_t) +
+ glyphCount + glyphCount +
+ hdr->leftClassCount * hdr->rightClassCount > aSubtableLen) {
+ return 0;
+ }
+
+ if (aFirstGlyph >= glyphCount || aSecondGlyph >= glyphCount) {
+ // glyphs are out of range for the class tables
+ return 0;
+ }
+
+ // get pointers to the four arrays within the subtable
+ const AutoSwap_PRInt16* kernValue =
+ reinterpret_cast<const AutoSwap_PRInt16*>(hdr + 1);
+ const uint8_t* leftClass =
+ reinterpret_cast<const uint8_t*>(kernValue + hdr->kernValueCount);
+ const uint8_t* rightClass = leftClass + glyphCount;
+ const uint8_t* kernIndex = rightClass + glyphCount;
+
+ uint8_t lc = leftClass[aFirstGlyph];
+ uint8_t rc = rightClass[aSecondGlyph];
+ if (lc >= hdr->leftClassCount || rc >= hdr->rightClassCount) {
+ return 0;
+ }
+
+ uint8_t ki = kernIndex[leftClass[aFirstGlyph] * hdr->rightClassCount +
+ rightClass[aSecondGlyph]];
+ if (ki >= hdr->kernValueCount) {
+ return 0;
+ }
+
+ return kernValue[ki];
+}
+
+#define KERN0_COVERAGE_HORIZONTAL 0x0001
+#define KERN0_COVERAGE_MINIMUM 0x0002
+#define KERN0_COVERAGE_CROSS_STREAM 0x0004
+#define KERN0_COVERAGE_OVERRIDE 0x0008
+#define KERN0_COVERAGE_RESERVED 0x00F0
+
+#define KERN1_COVERAGE_VERTICAL 0x8000
+#define KERN1_COVERAGE_CROSS_STREAM 0x4000
+#define KERN1_COVERAGE_VARIATION 0x2000
+#define KERN1_COVERAGE_RESERVED 0x1F00
+
+hb_position_t
+gfxHarfBuzzShaper::GetHKerning(uint16_t aFirstGlyph,
+ uint16_t aSecondGlyph) const
+{
+ // We want to ignore any kern pairs involving <space>, because we are
+ // handling words in isolation, the only space characters seen here are
+ // the ones artificially added by the textRun code.
+ uint32_t spaceGlyph = mFont->GetSpaceGlyph();
+ if (aFirstGlyph == spaceGlyph || aSecondGlyph == spaceGlyph) {
+ return 0;
+ }
+
+ if (!mKernTable) {
+ mKernTable = mFont->GetFontEntry()->GetFontTable(TRUETYPE_TAG('k','e','r','n'));
+ if (!mKernTable) {
+ mKernTable = hb_blob_get_empty();
+ }
+ }
+
+ uint32_t len;
+ const char* base = hb_blob_get_data(mKernTable, &len);
+ if (len < sizeof(KernTableVersion0)) {
+ return 0;
+ }
+ int32_t value = 0;
+
+ // First try to interpret as "version 0" kern table
+ // (see http://www.microsoft.com/typography/otspec/kern.htm)
+ const KernTableVersion0* kern0 =
+ reinterpret_cast<const KernTableVersion0*>(base);
+ if (uint16_t(kern0->version) == 0) {
+ uint16_t nTables = kern0->nTables;
+ uint32_t offs = sizeof(KernTableVersion0);
+ for (uint16_t i = 0; i < nTables; ++i) {
+ if (offs + sizeof(KernTableSubtableHeaderVersion0) > len) {
+ break;
+ }
+ const KernTableSubtableHeaderVersion0* st0 =
+ reinterpret_cast<const KernTableSubtableHeaderVersion0*>
+ (base + offs);
+ uint16_t subtableLen = uint16_t(st0->length);
+ if (offs + subtableLen > len) {
+ break;
+ }
+ offs += subtableLen;
+ uint16_t coverage = st0->coverage;
+ if (!(coverage & KERN0_COVERAGE_HORIZONTAL)) {
+ // we only care about horizontal kerning (for now)
+ continue;
+ }
+ if (coverage &
+ (KERN0_COVERAGE_CROSS_STREAM | KERN0_COVERAGE_RESERVED)) {
+ // we don't support cross-stream kerning, and
+ // reserved bits should be zero;
+ // ignore the subtable if not
+ continue;
+ }
+ uint8_t format = (coverage >> 8);
+ switch (format) {
+ case 0:
+ GetKernValueFmt0(st0 + 1, subtableLen - sizeof(*st0),
+ aFirstGlyph, aSecondGlyph, value,
+ (coverage & KERN0_COVERAGE_OVERRIDE) != 0,
+ (coverage & KERN0_COVERAGE_MINIMUM) != 0);
+ break;
+ default:
+ // TODO: implement support for other formats,
+ // if they're ever used in practice
+#if DEBUG
+ {
+ char buf[1024];
+ SprintfLiteral(buf, "unknown kern subtable in %s: "
+ "ver 0 format %d\n",
+ NS_ConvertUTF16toUTF8(mFont->GetName()).get(),
+ format);
+ NS_WARNING(buf);
+ }
+#endif
+ break;
+ }
+ }
+ } else {
+ // It wasn't a "version 0" table; check if it is Apple version 1.0
+ // (see http://developer.apple.com/fonts/TTRefMan/RM06/Chap6kern.html)
+ const KernTableVersion1* kern1 =
+ reinterpret_cast<const KernTableVersion1*>(base);
+ if (uint32_t(kern1->version) == 0x00010000) {
+ uint32_t nTables = kern1->nTables;
+ uint32_t offs = sizeof(KernTableVersion1);
+ for (uint32_t i = 0; i < nTables; ++i) {
+ if (offs + sizeof(KernTableSubtableHeaderVersion1) > len) {
+ break;
+ }
+ const KernTableSubtableHeaderVersion1* st1 =
+ reinterpret_cast<const KernTableSubtableHeaderVersion1*>
+ (base + offs);
+ uint32_t subtableLen = uint32_t(st1->length);
+ offs += subtableLen;
+ uint16_t coverage = st1->coverage;
+ if (coverage &
+ (KERN1_COVERAGE_VERTICAL |
+ KERN1_COVERAGE_CROSS_STREAM |
+ KERN1_COVERAGE_VARIATION |
+ KERN1_COVERAGE_RESERVED)) {
+ // we only care about horizontal kerning (for now),
+ // we don't support cross-stream kerning,
+ // we don't support variations,
+ // reserved bits should be zero;
+ // ignore the subtable if not
+ continue;
+ }
+ uint8_t format = (coverage & 0xff);
+ switch (format) {
+ case 0:
+ GetKernValueFmt0(st1 + 1, subtableLen - sizeof(*st1),
+ aFirstGlyph, aSecondGlyph, value);
+ break;
+ case 2:
+ value = GetKernValueVersion1Fmt2(st1, subtableLen,
+ aFirstGlyph, aSecondGlyph);
+ break;
+ case 3:
+ value = GetKernValueVersion1Fmt3(st1, subtableLen,
+ aFirstGlyph, aSecondGlyph);
+ break;
+ default:
+ // TODO: implement support for other formats.
+ // Note that format 1 cannot be supported here,
+ // as it requires the full glyph array to run the FSM,
+ // not just the current glyph pair.
+#if DEBUG
+ {
+ char buf[1024];
+ SprintfLiteral(buf, "unknown kern subtable in %s: "
+ "ver 0 format %d\n",
+ NS_ConvertUTF16toUTF8(mFont->GetName()).get(),
+ format);
+ NS_WARNING(buf);
+ }
+#endif
+ break;
+ }
+ }
+ }
+ }
+
+ if (value != 0) {
+ return FloatToFixed(mFont->FUnitsToDevUnitsFactor() * value);
+ }
+ return 0;
+}
+
+static hb_position_t
+HBGetHKerning(hb_font_t *font, void *font_data,
+ hb_codepoint_t first_glyph, hb_codepoint_t second_glyph,
+ void *user_data)
+{
+ const gfxHarfBuzzShaper::FontCallbackData *fcd =
+ static_cast<const gfxHarfBuzzShaper::FontCallbackData*>(font_data);
+ return fcd->mShaper->GetHKerning(first_glyph, second_glyph);
+}
+
+/*
+ * HarfBuzz unicode property callbacks
+ */
+
+static hb_codepoint_t
+HBGetMirroring(hb_unicode_funcs_t *ufuncs, hb_codepoint_t aCh,
+ void *user_data)
+{
+ return GetMirroredChar(aCh);
+}
+
+static hb_unicode_general_category_t
+HBGetGeneralCategory(hb_unicode_funcs_t *ufuncs, hb_codepoint_t aCh,
+ void *user_data)
+{
+ return hb_unicode_general_category_t(GetGeneralCategory(aCh));
+}
+
+static hb_script_t
+HBGetScript(hb_unicode_funcs_t *ufuncs, hb_codepoint_t aCh, void *user_data)
+{
+ return hb_script_t(GetScriptTagForCode(GetScriptCode(aCh)));
+}
+
+static hb_unicode_combining_class_t
+HBGetCombiningClass(hb_unicode_funcs_t *ufuncs, hb_codepoint_t aCh,
+ void *user_data)
+{
+ return hb_unicode_combining_class_t(GetCombiningClass(aCh));
+}
+
+// Hebrew presentation forms with dagesh, for characters 0x05D0..0x05EA;
+// note that some letters do not have a dagesh presForm encoded
+static const char16_t sDageshForms[0x05EA - 0x05D0 + 1] = {
+ 0xFB30, // ALEF
+ 0xFB31, // BET
+ 0xFB32, // GIMEL
+ 0xFB33, // DALET
+ 0xFB34, // HE
+ 0xFB35, // VAV
+ 0xFB36, // ZAYIN
+ 0, // HET
+ 0xFB38, // TET
+ 0xFB39, // YOD
+ 0xFB3A, // FINAL KAF
+ 0xFB3B, // KAF
+ 0xFB3C, // LAMED
+ 0, // FINAL MEM
+ 0xFB3E, // MEM
+ 0, // FINAL NUN
+ 0xFB40, // NUN
+ 0xFB41, // SAMEKH
+ 0, // AYIN
+ 0xFB43, // FINAL PE
+ 0xFB44, // PE
+ 0, // FINAL TSADI
+ 0xFB46, // TSADI
+ 0xFB47, // QOF
+ 0xFB48, // RESH
+ 0xFB49, // SHIN
+ 0xFB4A // TAV
+};
+
+static hb_bool_t
+HBUnicodeCompose(hb_unicode_funcs_t *ufuncs,
+ hb_codepoint_t a,
+ hb_codepoint_t b,
+ hb_codepoint_t *ab,
+ void *user_data)
+{
+#if MOZ_HB_SHAPER_USE_ICU_NORMALIZATION
+
+ if (sNormalizer) {
+ UChar32 ch = unorm2_composePair(sNormalizer, a, b);
+ if (ch >= 0) {
+ *ab = ch;
+ return true;
+ }
+ }
+
+#else // no ICU available, use the old nsUnicodeNormalizer
+
+ if (nsUnicodeNormalizer::Compose(a, b, ab)) {
+ return true;
+ }
+
+#endif
+
+ return false;
+}
+
+static hb_bool_t
+HBUnicodeDecompose(hb_unicode_funcs_t *ufuncs,
+ hb_codepoint_t ab,
+ hb_codepoint_t *a,
+ hb_codepoint_t *b,
+ void *user_data)
+{
+#ifdef MOZ_WIDGET_ANDROID
+ // Hack for the SamsungDevanagari font, bug 1012365:
+ // support U+0972 by decomposing it.
+ if (ab == 0x0972) {
+ *a = 0x0905;
+ *b = 0x0945;
+ return true;
+ }
+#endif
+
+#if MOZ_HB_SHAPER_USE_ICU_NORMALIZATION
+
+ if (!sNormalizer) {
+ return false;
+ }
+
+ // Canonical decompositions are never more than two characters,
+ // or a maximum of 4 utf-16 code units.
+ const unsigned MAX_DECOMP_LENGTH = 4;
+
+ UErrorCode error = U_ZERO_ERROR;
+ UChar decomp[MAX_DECOMP_LENGTH];
+ int32_t len = unorm2_getRawDecomposition(sNormalizer, ab, decomp,
+ MAX_DECOMP_LENGTH, &error);
+ if (U_FAILURE(error) || len < 0) {
+ return false;
+ }
+
+ UText text = UTEXT_INITIALIZER;
+ utext_openUChars(&text, decomp, len, &error);
+ NS_ASSERTION(U_SUCCESS(error), "UText failure?");
+
+ UChar32 ch = UTEXT_NEXT32(&text);
+ if (ch != U_SENTINEL) {
+ *a = ch;
+ }
+ ch = UTEXT_NEXT32(&text);
+ if (ch != U_SENTINEL) {
+ *b = ch;
+ }
+ utext_close(&text);
+
+ return *b != 0 || *a != ab;
+
+#else // no ICU available, use the old nsUnicodeNormalizer
+
+ return nsUnicodeNormalizer::DecomposeNonRecursively(ab, a, b);
+
+#endif
+}
+
+static void
+AddOpenTypeFeature(const uint32_t& aTag, uint32_t& aValue, void *aUserArg)
+{
+ nsTArray<hb_feature_t>* features = static_cast<nsTArray<hb_feature_t>*> (aUserArg);
+
+ hb_feature_t feat = { 0, 0, 0, UINT_MAX };
+ feat.tag = aTag;
+ feat.value = aValue;
+ features->AppendElement(feat);
+}
+
+/*
+ * gfxFontShaper override to initialize the text run using HarfBuzz
+ */
+
+static hb_font_funcs_t * sHBFontFuncs = nullptr;
+static hb_unicode_funcs_t * sHBUnicodeFuncs = nullptr;
+static const hb_script_t sMathScript =
+ hb_ot_tag_to_script(HB_TAG('m','a','t','h'));
+
+bool
+gfxHarfBuzzShaper::Initialize()
+{
+ if (mInitialized) {
+ return mHBFont != nullptr;
+ }
+ mInitialized = true;
+ mCallbackData.mShaper = this;
+
+ mUseFontGlyphWidths = mFont->ProvidesGlyphWidths();
+
+ if (!sHBFontFuncs) {
+ // static function callback pointers, initialized by the first
+ // harfbuzz shaper used
+ sHBFontFuncs = hb_font_funcs_create();
+ hb_font_funcs_set_nominal_glyph_func(sHBFontFuncs,
+ HBGetNominalGlyph,
+ nullptr, nullptr);
+ hb_font_funcs_set_variation_glyph_func(sHBFontFuncs,
+ HBGetVariationGlyph,
+ nullptr, nullptr);
+ hb_font_funcs_set_glyph_h_advance_func(sHBFontFuncs,
+ HBGetGlyphHAdvance,
+ nullptr, nullptr);
+ hb_font_funcs_set_glyph_v_advance_func(sHBFontFuncs,
+ HBGetGlyphVAdvance,
+ nullptr, nullptr);
+ hb_font_funcs_set_glyph_v_origin_func(sHBFontFuncs,
+ HBGetGlyphVOrigin,
+ nullptr, nullptr);
+ hb_font_funcs_set_glyph_extents_func(sHBFontFuncs,
+ HBGetGlyphExtents,
+ nullptr, nullptr);
+ hb_font_funcs_set_glyph_contour_point_func(sHBFontFuncs,
+ HBGetContourPoint,
+ nullptr, nullptr);
+ hb_font_funcs_set_glyph_h_kerning_func(sHBFontFuncs,
+ HBGetHKerning,
+ nullptr, nullptr);
+
+ sHBUnicodeFuncs =
+ hb_unicode_funcs_create(hb_unicode_funcs_get_empty());
+ hb_unicode_funcs_set_mirroring_func(sHBUnicodeFuncs,
+ HBGetMirroring,
+ nullptr, nullptr);
+ hb_unicode_funcs_set_script_func(sHBUnicodeFuncs, HBGetScript,
+ nullptr, nullptr);
+ hb_unicode_funcs_set_general_category_func(sHBUnicodeFuncs,
+ HBGetGeneralCategory,
+ nullptr, nullptr);
+ hb_unicode_funcs_set_combining_class_func(sHBUnicodeFuncs,
+ HBGetCombiningClass,
+ nullptr, nullptr);
+ hb_unicode_funcs_set_compose_func(sHBUnicodeFuncs,
+ HBUnicodeCompose,
+ nullptr, nullptr);
+ hb_unicode_funcs_set_decompose_func(sHBUnicodeFuncs,
+ HBUnicodeDecompose,
+ nullptr, nullptr);
+
+#if MOZ_HB_SHAPER_USE_ICU_NORMALIZATION
+ UErrorCode error = U_ZERO_ERROR;
+ sNormalizer = unorm2_getNFCInstance(&error);
+ NS_ASSERTION(U_SUCCESS(error), "failed to get ICU normalizer");
+#endif
+ }
+
+ gfxFontEntry *entry = mFont->GetFontEntry();
+ if (!mUseFontGetGlyph) {
+ // get the cmap table and find offset to our subtable
+ mCmapTable = entry->GetFontTable(TRUETYPE_TAG('c','m','a','p'));
+ if (!mCmapTable) {
+ NS_WARNING("failed to load cmap, glyphs will be missing");
+ return false;
+ }
+ uint32_t len;
+ const uint8_t* data = (const uint8_t*)hb_blob_get_data(mCmapTable, &len);
+ bool symbol;
+ mCmapFormat = gfxFontUtils::
+ FindPreferredSubtable(data, len,
+ &mSubtableOffset, &mUVSTableOffset,
+ &symbol);
+ if (mCmapFormat <= 0) {
+ return false;
+ }
+ }
+
+ if (!mUseFontGlyphWidths) {
+ // If font doesn't implement GetGlyphWidth, we will be reading
+ // the metrics table directly, so make sure we can load it.
+ if (!LoadHmtxTable()) {
+ return false;
+ }
+ }
+
+ mHBFont = hb_font_create(mHBFace);
+ hb_font_set_funcs(mHBFont, sHBFontFuncs, &mCallbackData, nullptr);
+ hb_font_set_ppem(mHBFont, mFont->GetAdjustedSize(), mFont->GetAdjustedSize());
+ uint32_t scale = FloatToFixed(mFont->GetAdjustedSize()); // 16.16 fixed-point
+ hb_font_set_scale(mHBFont, scale, scale);
+
+ return true;
+}
+
+bool
+gfxHarfBuzzShaper::LoadHmtxTable()
+{
+ // Read mNumLongHMetrics from metrics-head table without caching its
+ // blob, and preload/cache the metrics table.
+ gfxFontEntry *entry = mFont->GetFontEntry();
+ gfxFontEntry::AutoTable hheaTable(entry, TRUETYPE_TAG('h','h','e','a'));
+ if (hheaTable) {
+ uint32_t len;
+ const MetricsHeader* hhea =
+ reinterpret_cast<const MetricsHeader*>
+ (hb_blob_get_data(hheaTable, &len));
+ if (len >= sizeof(MetricsHeader)) {
+ mNumLongHMetrics = hhea->numOfLongMetrics;
+ if (mNumLongHMetrics > 0 &&
+ int16_t(hhea->metricDataFormat) == 0) {
+ // no point reading metrics if number of entries is zero!
+ // in that case, we won't be able to use this font
+ // (this method will return FALSE below if mHmtxTable
+ // is null)
+ mHmtxTable = entry->GetFontTable(TRUETYPE_TAG('h','m','t','x'));
+ if (mHmtxTable && hb_blob_get_length(mHmtxTable) <
+ mNumLongHMetrics * sizeof(LongMetric)) {
+ // metrics table is not large enough for the claimed
+ // number of entries: invalid, do not use.
+ hb_blob_destroy(mHmtxTable);
+ mHmtxTable = nullptr;
+ }
+ }
+ }
+ }
+ if (!mHmtxTable) {
+ return false;
+ }
+ return true;
+}
+
+bool
+gfxHarfBuzzShaper::InitializeVertical()
+{
+ // We only try this once. If we don't have a mHmtxTable after that,
+ // this font can't handle vertical shaping, so return false.
+ if (mVerticalInitialized) {
+ return mHmtxTable != nullptr;
+ }
+ mVerticalInitialized = true;
+
+ if (!mHmtxTable) {
+ if (!LoadHmtxTable()) {
+ return false;
+ }
+ }
+
+ // Load vertical metrics if present in the font; if not, we'll synthesize
+ // vertical glyph advances based on (horizontal) ascent/descent metrics.
+ gfxFontEntry *entry = mFont->GetFontEntry();
+ gfxFontEntry::AutoTable vheaTable(entry, TRUETYPE_TAG('v','h','e','a'));
+ if (vheaTable) {
+ uint32_t len;
+ const MetricsHeader* vhea =
+ reinterpret_cast<const MetricsHeader*>
+ (hb_blob_get_data(vheaTable, &len));
+ if (len >= sizeof(MetricsHeader)) {
+ mNumLongVMetrics = vhea->numOfLongMetrics;
+ gfxFontEntry::AutoTable
+ maxpTable(entry, TRUETYPE_TAG('m','a','x','p'));
+ int numGlyphs = -1; // invalid if we fail to read 'maxp'
+ if (maxpTable &&
+ hb_blob_get_length(maxpTable) >= sizeof(MaxpTableHeader)) {
+ const MaxpTableHeader* maxp =
+ reinterpret_cast<const MaxpTableHeader*>
+ (hb_blob_get_data(maxpTable, nullptr));
+ numGlyphs = uint16_t(maxp->numGlyphs);
+ }
+ if (mNumLongVMetrics > 0 && mNumLongVMetrics <= numGlyphs &&
+ int16_t(vhea->metricDataFormat) == 0) {
+ mVmtxTable = entry->GetFontTable(TRUETYPE_TAG('v','m','t','x'));
+ if (mVmtxTable && hb_blob_get_length(mVmtxTable) <
+ mNumLongVMetrics * sizeof(LongMetric) +
+ (numGlyphs - mNumLongVMetrics) * sizeof(int16_t)) {
+ // metrics table is not large enough for the claimed
+ // number of entries: invalid, do not use.
+ hb_blob_destroy(mVmtxTable);
+ mVmtxTable = nullptr;
+ }
+ }
+ }
+ }
+
+ // For CFF fonts only, load a VORG table if present.
+ if (entry->HasFontTable(TRUETYPE_TAG('C','F','F',' '))) {
+ mVORGTable = entry->GetFontTable(TRUETYPE_TAG('V','O','R','G'));
+ if (mVORGTable) {
+ uint32_t len;
+ const VORG* vorg =
+ reinterpret_cast<const VORG*>(hb_blob_get_data(mVORGTable,
+ &len));
+ if (len < sizeof(VORG) ||
+ uint16_t(vorg->majorVersion) != 1 ||
+ uint16_t(vorg->minorVersion) != 0 ||
+ len < sizeof(VORG) + uint16_t(vorg->numVertOriginYMetrics) *
+ sizeof(VORGrec)) {
+ // VORG table is an unknown version, or not large enough
+ // to be valid -- discard it.
+ NS_WARNING("discarding invalid VORG table");
+ hb_blob_destroy(mVORGTable);
+ mVORGTable = nullptr;
+ }
+ }
+ }
+
+ return true;
+}
+
+bool
+gfxHarfBuzzShaper::ShapeText(DrawTarget *aDrawTarget,
+ const char16_t *aText,
+ uint32_t aOffset,
+ uint32_t aLength,
+ Script aScript,
+ bool aVertical,
+ gfxShapedText *aShapedText)
+{
+ // some font back-ends require this in order to get proper hinted metrics
+ if (!mFont->SetupCairoFont(aDrawTarget)) {
+ return false;
+ }
+
+ mCallbackData.mDrawTarget = aDrawTarget;
+ mUseVerticalPresentationForms = false;
+
+ if (!Initialize()) {
+ return false;
+ }
+
+ if (aVertical) {
+ if (!InitializeVertical()) {
+ return false;
+ }
+ if (!mFont->GetFontEntry()->
+ SupportsOpenTypeFeature(aScript, HB_TAG('v','e','r','t'))) {
+ mUseVerticalPresentationForms = true;
+ }
+ }
+
+ const gfxFontStyle *style = mFont->GetStyle();
+
+ // 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();
+
+ // insert any merged features into hb_feature array
+ AutoTArray<hb_feature_t,20> features;
+ MergeFontFeatures(style,
+ entry->mFeatureSettings,
+ aShapedText->DisableLigatures(),
+ entry->FamilyName(),
+ addSmallCaps,
+ AddOpenTypeFeature,
+ &features);
+
+ bool isRightToLeft = aShapedText->IsRightToLeft();
+ hb_buffer_t *buffer = hb_buffer_create();
+ hb_buffer_set_unicode_funcs(buffer, sHBUnicodeFuncs);
+
+ hb_buffer_set_direction(buffer,
+ aVertical ? HB_DIRECTION_TTB :
+ (isRightToLeft ? HB_DIRECTION_RTL :
+ HB_DIRECTION_LTR));
+ hb_script_t scriptTag;
+ if (aShapedText->GetFlags() & gfxTextRunFactory::TEXT_USE_MATH_SCRIPT) {
+ scriptTag = sMathScript;
+ } else {
+ scriptTag = GetHBScriptUsedForShaping(aScript);
+ }
+ hb_buffer_set_script(buffer, scriptTag);
+
+ hb_language_t language;
+ if (style->languageOverride) {
+ language = hb_ot_tag_to_language(style->languageOverride);
+ } else if (entry->mLanguageOverride) {
+ language = hb_ot_tag_to_language(entry->mLanguageOverride);
+ } else if (style->explicitLanguage) {
+ nsCString langString;
+ style->language->ToUTF8String(langString);
+ language =
+ hb_language_from_string(langString.get(), langString.Length());
+ } else {
+ language = hb_ot_tag_to_language(HB_OT_TAG_DEFAULT_LANGUAGE);
+ }
+ hb_buffer_set_language(buffer, language);
+
+ uint32_t length = aLength;
+ hb_buffer_add_utf16(buffer,
+ reinterpret_cast<const uint16_t*>(aText),
+ length, 0, length);
+
+ hb_buffer_set_cluster_level(buffer, HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS);
+
+ hb_shape(mHBFont, buffer, features.Elements(), features.Length());
+
+ if (isRightToLeft) {
+ hb_buffer_reverse(buffer);
+ }
+
+ nsresult rv = SetGlyphsFromRun(aDrawTarget, aShapedText, aOffset, aLength,
+ aText, buffer, aVertical);
+
+ NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+ "failed to store glyphs into gfxShapedWord");
+ hb_buffer_destroy(buffer);
+
+ return NS_SUCCEEDED(rv);
+}
+
+#define SMALL_GLYPH_RUN 128 // some testing indicates that 90%+ of text runs
+ // will fit without requiring separate allocation
+ // for charToGlyphArray
+
+nsresult
+gfxHarfBuzzShaper::SetGlyphsFromRun(DrawTarget *aDrawTarget,
+ gfxShapedText *aShapedText,
+ uint32_t aOffset,
+ uint32_t aLength,
+ const char16_t *aText,
+ hb_buffer_t *aBuffer,
+ bool aVertical)
+{
+ uint32_t numGlyphs;
+ const hb_glyph_info_t *ginfo = hb_buffer_get_glyph_infos(aBuffer, &numGlyphs);
+ if (numGlyphs == 0) {
+ return NS_OK;
+ }
+
+ AutoTArray<gfxTextRun::DetailedGlyph,1> detailedGlyphs;
+
+ uint32_t wordLength = aLength;
+ static const int32_t NO_GLYPH = -1;
+ AutoTArray<int32_t,SMALL_GLYPH_RUN> charToGlyphArray;
+ if (!charToGlyphArray.SetLength(wordLength, fallible)) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ int32_t *charToGlyph = charToGlyphArray.Elements();
+ for (uint32_t offset = 0; offset < wordLength; ++offset) {
+ charToGlyph[offset] = NO_GLYPH;
+ }
+
+ for (uint32_t i = 0; i < numGlyphs; ++i) {
+ uint32_t loc = ginfo[i].cluster;
+ if (loc < wordLength) {
+ charToGlyph[loc] = i;
+ }
+ }
+
+ int32_t glyphStart = 0; // looking for a clump that starts at this glyph
+ int32_t charStart = 0; // and this char index within the range of the run
+
+ bool roundI, roundB;
+ if (aVertical) {
+ GetRoundOffsetsToPixels(aDrawTarget, &roundB, &roundI);
+ } else {
+ GetRoundOffsetsToPixels(aDrawTarget, &roundI, &roundB);
+ }
+
+ int32_t appUnitsPerDevUnit = aShapedText->GetAppUnitsPerDevUnit();
+ gfxShapedText::CompressedGlyph *charGlyphs =
+ aShapedText->GetCharacterGlyphs() + aOffset;
+
+ // factor to convert 16.16 fixed-point pixels to app units
+ // (only used if not rounding)
+ double hb2appUnits = FixedToFloat(aShapedText->GetAppUnitsPerDevUnit());
+
+ // Residual from rounding of previous advance, for use in rounding the
+ // subsequent offset or advance appropriately. 16.16 fixed-point
+ //
+ // When rounding, the goal is to make the distance between glyphs and
+ // their base glyph equal to the integral number of pixels closest to that
+ // suggested by that shaper.
+ // i.e. posInfo[n].x_advance - posInfo[n].x_offset + posInfo[n+1].x_offset
+ //
+ // The value of the residual is the part of the desired distance that has
+ // not been included in integer offsets.
+ hb_position_t residual = 0;
+
+ // keep track of y-position to set glyph offsets if needed
+ nscoord bPos = 0;
+
+ const hb_glyph_position_t *posInfo =
+ hb_buffer_get_glyph_positions(aBuffer, nullptr);
+
+ while (glyphStart < int32_t(numGlyphs)) {
+
+ int32_t charEnd = ginfo[glyphStart].cluster;
+ int32_t glyphEnd = glyphStart;
+ int32_t charLimit = wordLength;
+ while (charEnd < charLimit) {
+ // This is normally executed once for each iteration of the outer loop,
+ // but in unusual cases where the character/glyph association is complex,
+ // the initial character range might correspond to a non-contiguous
+ // glyph range with "holes" in it. If so, we will repeat this loop to
+ // extend the character range until we have a contiguous glyph sequence.
+ charEnd += 1;
+ while (charEnd != charLimit && charToGlyph[charEnd] == NO_GLYPH) {
+ charEnd += 1;
+ }
+
+ // find the maximum glyph index covered by the clump so far
+ for (int32_t i = charStart; i < charEnd; ++i) {
+ if (charToGlyph[i] != NO_GLYPH) {
+ glyphEnd = std::max(glyphEnd, charToGlyph[i] + 1);
+ // update extent of glyph range
+ }
+ }
+
+ if (glyphEnd == glyphStart + 1) {
+ // for the common case of a single-glyph clump,
+ // we can skip the following checks
+ break;
+ }
+
+ if (glyphEnd == glyphStart) {
+ // no glyphs, try to extend the clump
+ continue;
+ }
+
+ // check whether all glyphs in the range are associated with the characters
+ // in our clump; if not, we have a discontinuous range, and should extend it
+ // unless we've reached the end of the text
+ bool allGlyphsAreWithinCluster = true;
+ for (int32_t i = glyphStart; i < glyphEnd; ++i) {
+ int32_t glyphCharIndex = ginfo[i].cluster;
+ if (glyphCharIndex < charStart || glyphCharIndex >= charEnd) {
+ allGlyphsAreWithinCluster = false;
+ break;
+ }
+ }
+ if (allGlyphsAreWithinCluster) {
+ break;
+ }
+ }
+
+ NS_ASSERTION(glyphStart < glyphEnd,
+ "character/glyph clump contains no glyphs!");
+ NS_ASSERTION(charStart != charEnd,
+ "character/glyph clump contains no characters!");
+
+ // Now charStart..charEnd is a ligature clump, corresponding to glyphStart..glyphEnd;
+ // Set baseCharIndex to the char we'll actually attach the glyphs to (1st of ligature),
+ // and endCharIndex to the limit (position beyond the last char),
+ // adjusting for the offset of the stringRange relative to the textRun.
+ int32_t baseCharIndex, endCharIndex;
+ while (charEnd < int32_t(wordLength) && charToGlyph[charEnd] == NO_GLYPH)
+ charEnd++;
+ baseCharIndex = charStart;
+ endCharIndex = charEnd;
+
+ // Then we check if the clump falls outside our actual string range;
+ // if so, just go to the next.
+ if (baseCharIndex >= int32_t(wordLength)) {
+ glyphStart = glyphEnd;
+ charStart = charEnd;
+ continue;
+ }
+ // Ensure we won't try to go beyond the valid length of the textRun's text
+ endCharIndex = std::min<int32_t>(endCharIndex, wordLength);
+
+ // Now we're ready to set the glyph info in the textRun
+ int32_t glyphsInClump = glyphEnd - glyphStart;
+
+ // Check for default-ignorable char that didn't get filtered, combined,
+ // etc by the shaping process, and remove from the run.
+ // (This may be done within harfbuzz eventually.)
+ if (glyphsInClump == 1 && baseCharIndex + 1 == endCharIndex &&
+ aShapedText->FilterIfIgnorable(aOffset + baseCharIndex,
+ aText[baseCharIndex])) {
+ glyphStart = glyphEnd;
+ charStart = charEnd;
+ continue;
+ }
+
+ // HarfBuzz gives us physical x- and y-coordinates, but we will store
+ // them as logical inline- and block-direction values in the textrun.
+
+ hb_position_t i_offset, i_advance; // inline-direction offset/advance
+ hb_position_t b_offset, b_advance; // block-direction offset/advance
+ if (aVertical) {
+ i_offset = posInfo[glyphStart].y_offset;
+ i_advance = posInfo[glyphStart].y_advance;
+ b_offset = posInfo[glyphStart].x_offset;
+ b_advance = posInfo[glyphStart].x_advance;
+ } else {
+ i_offset = posInfo[glyphStart].x_offset;
+ i_advance = posInfo[glyphStart].x_advance;
+ b_offset = posInfo[glyphStart].y_offset;
+ b_advance = posInfo[glyphStart].y_advance;
+ }
+
+ nscoord iOffset, advance;
+ if (roundI) {
+ iOffset =
+ appUnitsPerDevUnit * FixedToIntRound(i_offset + residual);
+ // Desired distance from the base glyph to the next reference point.
+ hb_position_t width = i_advance - i_offset;
+ int intWidth = FixedToIntRound(width);
+ residual = width - FloatToFixed(intWidth);
+ advance = appUnitsPerDevUnit * intWidth + iOffset;
+ } else {
+ iOffset = floor(hb2appUnits * i_offset + 0.5);
+ advance = floor(hb2appUnits * i_advance + 0.5);
+ }
+ // Check if it's a simple one-to-one mapping
+ if (glyphsInClump == 1 &&
+ gfxTextRun::CompressedGlyph::IsSimpleGlyphID(ginfo[glyphStart].codepoint) &&
+ gfxTextRun::CompressedGlyph::IsSimpleAdvance(advance) &&
+ charGlyphs[baseCharIndex].IsClusterStart() &&
+ iOffset == 0 && b_offset == 0 &&
+ b_advance == 0 && bPos == 0)
+ {
+ charGlyphs[baseCharIndex].SetSimpleGlyph(advance,
+ ginfo[glyphStart].codepoint);
+ } else {
+ // Collect all glyphs in a list to be assigned to the first char;
+ // there must be at least one in the clump, and we already measured
+ // its advance, hence the placement of the loop-exit test and the
+ // measurement of the next glyph.
+ // For vertical orientation, we add a "base offset" to compensate
+ // for the positioning within the cluster being based on horizontal
+ // glyph origin/offset.
+ hb_position_t baseIOffset, baseBOffset;
+ if (aVertical) {
+ baseIOffset = 2 * (i_offset - i_advance);
+ baseBOffset = GetGlyphHAdvance(ginfo[glyphStart].codepoint);
+ }
+ while (1) {
+ gfxTextRun::DetailedGlyph* details =
+ detailedGlyphs.AppendElement();
+ details->mGlyphID = ginfo[glyphStart].codepoint;
+
+ details->mXOffset = iOffset;
+ details->mAdvance = advance;
+
+ details->mYOffset = bPos -
+ (roundB ? appUnitsPerDevUnit * FixedToIntRound(b_offset)
+ : floor(hb2appUnits * b_offset + 0.5));
+
+ if (b_advance != 0) {
+ bPos -=
+ roundB ? appUnitsPerDevUnit * FixedToIntRound(b_advance)
+ : floor(hb2appUnits * b_advance + 0.5);
+ }
+ if (++glyphStart >= glyphEnd) {
+ break;
+ }
+
+ if (aVertical) {
+ i_offset = baseIOffset - posInfo[glyphStart].y_offset;
+ i_advance = posInfo[glyphStart].y_advance;
+ b_offset = baseBOffset - posInfo[glyphStart].x_offset;
+ b_advance = posInfo[glyphStart].x_advance;
+ } else {
+ i_offset = posInfo[glyphStart].x_offset;
+ i_advance = posInfo[glyphStart].x_advance;
+ b_offset = posInfo[glyphStart].y_offset;
+ b_advance = posInfo[glyphStart].y_advance;
+ }
+
+ if (roundI) {
+ iOffset = appUnitsPerDevUnit *
+ FixedToIntRound(i_offset + residual);
+ // Desired distance to the next reference point. The
+ // residual is considered here, and includes the residual
+ // from the base glyph offset and subsequent advances, so
+ // that the distance from the base glyph is optimized
+ // rather than the distance from combining marks.
+ i_advance += residual;
+ int intAdvance = FixedToIntRound(i_advance);
+ residual = i_advance - FloatToFixed(intAdvance);
+ advance = appUnitsPerDevUnit * intAdvance;
+ } else {
+ iOffset = floor(hb2appUnits * i_offset + 0.5);
+ advance = floor(hb2appUnits * i_advance + 0.5);
+ }
+ }
+
+ gfxShapedText::CompressedGlyph g;
+ g.SetComplex(charGlyphs[baseCharIndex].IsClusterStart(),
+ true, detailedGlyphs.Length());
+ aShapedText->SetGlyphs(aOffset + baseCharIndex,
+ g, detailedGlyphs.Elements());
+
+ detailedGlyphs.Clear();
+ }
+
+ // the rest of the chars in the group are ligature continuations,
+ // no associated glyphs
+ while (++baseCharIndex != endCharIndex &&
+ baseCharIndex < int32_t(wordLength)) {
+ gfxShapedText::CompressedGlyph &g = charGlyphs[baseCharIndex];
+ NS_ASSERTION(!g.IsSimpleGlyph(), "overwriting a simple glyph");
+ g.SetComplex(g.IsClusterStart(), false, 0);
+ }
+
+ glyphStart = glyphEnd;
+ charStart = charEnd;
+ }
+
+ return NS_OK;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-08 19:56:05 +0000