mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
60d117e5ba
It seems like the sizes for these data structures can be controlled from Web content, and we are already prepared to deal with OOM conditions, except that we are using infallible allocations by mistake.
1250 lines
45 KiB
C++
1250 lines
45 KiB
C++
/* -*- 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 "gfxHarfBuzzShaper.h"
|
|
#include "gfxFontUtils.h"
|
|
#include "nsUnicodeProperties.h"
|
|
#include "nsUnicodeScriptCodes.h"
|
|
#include "nsUnicodeNormalizer.h"
|
|
|
|
#include "harfbuzz/hb.h"
|
|
#include "harfbuzz/hb-ot.h"
|
|
|
|
#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),
|
|
mNumLongMetrics(0),
|
|
mCmapTable(nullptr),
|
|
mCmapFormat(-1),
|
|
mSubtableOffset(0),
|
|
mUVSTableOffset(0),
|
|
mUseFontGetGlyph(aFont->ProvidesGetGlyph()),
|
|
mUseFontGlyphWidths(false),
|
|
mInitialized(false)
|
|
{
|
|
}
|
|
|
|
gfxHarfBuzzShaper::~gfxHarfBuzzShaper()
|
|
{
|
|
if (mCmapTable) {
|
|
hb_blob_destroy(mCmapTable);
|
|
}
|
|
if (mHmtxTable) {
|
|
hb_blob_destroy(mHmtxTable);
|
|
}
|
|
if (mKernTable) {
|
|
hb_blob_destroy(mKernTable);
|
|
}
|
|
if (mHBFont) {
|
|
hb_font_destroy(mHBFont);
|
|
}
|
|
if (mHBFace) {
|
|
hb_face_destroy(mHBFace);
|
|
}
|
|
}
|
|
|
|
#define UNICODE_BMP_LIMIT 0x10000
|
|
|
|
hb_codepoint_t
|
|
gfxHarfBuzzShaper::GetGlyph(hb_codepoint_t unicode,
|
|
hb_codepoint_t variation_selector) const
|
|
{
|
|
hb_codepoint_t gid = 0;
|
|
|
|
if (mUseFontGetGlyph) {
|
|
gid = mFont->GetGlyph(unicode, variation_selector);
|
|
} 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);
|
|
|
|
if (variation_selector) {
|
|
if (mUVSTableOffset) {
|
|
gid =
|
|
gfxFontUtils::MapUVSToGlyphFormat14(data + mUVSTableOffset,
|
|
unicode,
|
|
variation_selector);
|
|
}
|
|
// If the variation sequence was not supported, return zero here;
|
|
// harfbuzz will call us again for the base character alone
|
|
return gid;
|
|
}
|
|
|
|
switch (mCmapFormat) {
|
|
case 4:
|
|
gid = unicode < UNICODE_BMP_LIMIT ?
|
|
gfxFontUtils::MapCharToGlyphFormat4(data + mSubtableOffset,
|
|
unicode) : 0;
|
|
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 , just use the space glyph instead
|
|
if (unicode == 0xA0) {
|
|
gid = mFont->GetSpaceGlyph();
|
|
}
|
|
}
|
|
|
|
return gid;
|
|
}
|
|
|
|
static hb_bool_t
|
|
HBGetGlyph(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);
|
|
*glyph = fcd->mShaper->GetGlyph(unicode, variation_selector);
|
|
return *glyph != 0;
|
|
}
|
|
|
|
struct HMetricsHeader {
|
|
AutoSwap_PRUint32 tableVersionNumber;
|
|
AutoSwap_PRInt16 ascender;
|
|
AutoSwap_PRInt16 descender;
|
|
AutoSwap_PRInt16 lineGap;
|
|
AutoSwap_PRUint16 advanceWidthMax;
|
|
AutoSwap_PRInt16 minLeftSideBearing;
|
|
AutoSwap_PRInt16 minRightSideBearing;
|
|
AutoSwap_PRInt16 xMaxExtent;
|
|
AutoSwap_PRInt16 caretSlopeRise;
|
|
AutoSwap_PRInt16 caretSlopeRun;
|
|
AutoSwap_PRInt16 caretOffset;
|
|
AutoSwap_PRInt16 reserved[4];
|
|
AutoSwap_PRInt16 metricDataFormat;
|
|
AutoSwap_PRUint16 numberOfHMetrics;
|
|
};
|
|
|
|
struct HLongMetric {
|
|
AutoSwap_PRUint16 advanceWidth;
|
|
AutoSwap_PRInt16 lsb;
|
|
};
|
|
|
|
struct HMetrics {
|
|
HLongMetric metrics[1]; // actually numberOfHMetrics
|
|
// the variable-length metrics[] array is immediately followed by:
|
|
// AutoSwap_PRUint16 leftSideBearing[];
|
|
};
|
|
|
|
hb_position_t
|
|
gfxHarfBuzzShaper::GetGlyphHAdvance(gfxContext *aContext,
|
|
hb_codepoint_t glyph) const
|
|
{
|
|
if (mUseFontGlyphWidths) {
|
|
return mFont->GetGlyphWidth(aContext, glyph);
|
|
}
|
|
|
|
// font did not implement GetHintedGlyphWidth, so get an unhinted value
|
|
// directly from the font tables
|
|
|
|
NS_ASSERTION((mNumLongMetrics > 0) && mHmtxTable != nullptr,
|
|
"font is lacking metrics, we shouldn't be here");
|
|
|
|
if (glyph >= uint32_t(mNumLongMetrics)) {
|
|
glyph = mNumLongMetrics - 1;
|
|
}
|
|
|
|
// glyph must be valid now, because we checked during initialization
|
|
// that mNumLongMetrics is > 0, and that the hmtx table is large enough
|
|
// to contain mNumLongMetrics records
|
|
const HMetrics* hmtx =
|
|
reinterpret_cast<const HMetrics*>(hb_blob_get_data(mHmtxTable, nullptr));
|
|
return FloatToFixed(mFont->FUnitsToDevUnitsFactor() *
|
|
uint16_t(hmtx->metrics[glyph].advanceWidth));
|
|
}
|
|
|
|
static hb_position_t
|
|
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);
|
|
return fcd->mShaper->GetGlyphHAdvance(fcd->mContext, glyph);
|
|
}
|
|
|
|
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];
|
|
sprintf(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];
|
|
sprintf(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));
|
|
}
|
|
|
|
static unsigned int
|
|
HBGetEastAsianWidth(hb_unicode_funcs_t *ufuncs, hb_codepoint_t aCh,
|
|
void *user_data)
|
|
{
|
|
return GetEastAsianWidth(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)
|
|
{
|
|
hb_bool_t found = nsUnicodeNormalizer::Compose(a, b, ab);
|
|
|
|
if (!found && (b & 0x1fff80) == 0x0580) {
|
|
// special-case Hebrew presentation forms that are excluded from
|
|
// standard normalization, but wanted for old fonts
|
|
switch (b) {
|
|
case 0x05B4: // HIRIQ
|
|
if (a == 0x05D9) { // YOD
|
|
*ab = 0xFB1D;
|
|
found = true;
|
|
}
|
|
break;
|
|
case 0x05B7: // patah
|
|
if (a == 0x05F2) { // YIDDISH YOD YOD
|
|
*ab = 0xFB1F;
|
|
found = true;
|
|
} else if (a == 0x05D0) { // ALEF
|
|
*ab = 0xFB2E;
|
|
found = true;
|
|
}
|
|
break;
|
|
case 0x05B8: // QAMATS
|
|
if (a == 0x05D0) { // ALEF
|
|
*ab = 0xFB2F;
|
|
found = true;
|
|
}
|
|
break;
|
|
case 0x05B9: // HOLAM
|
|
if (a == 0x05D5) { // VAV
|
|
*ab = 0xFB4B;
|
|
found = true;
|
|
}
|
|
break;
|
|
case 0x05BC: // DAGESH
|
|
if (a >= 0x05D0 && a <= 0x05EA) {
|
|
*ab = sDageshForms[a - 0x05D0];
|
|
found = (*ab != 0);
|
|
} else if (a == 0xFB2A) { // SHIN WITH SHIN DOT
|
|
*ab = 0xFB2C;
|
|
found = true;
|
|
} else if (a == 0xFB2B) { // SHIN WITH SIN DOT
|
|
*ab = 0xFB2D;
|
|
found = true;
|
|
}
|
|
break;
|
|
case 0x05BF: // RAFE
|
|
switch (a) {
|
|
case 0x05D1: // BET
|
|
*ab = 0xFB4C;
|
|
found = true;
|
|
break;
|
|
case 0x05DB: // KAF
|
|
*ab = 0xFB4D;
|
|
found = true;
|
|
break;
|
|
case 0x05E4: // PE
|
|
*ab = 0xFB4E;
|
|
found = true;
|
|
break;
|
|
}
|
|
break;
|
|
case 0x05C1: // SHIN DOT
|
|
if (a == 0x05E9) { // SHIN
|
|
*ab = 0xFB2A;
|
|
found = true;
|
|
} else if (a == 0xFB49) { // SHIN WITH DAGESH
|
|
*ab = 0xFB2C;
|
|
found = true;
|
|
}
|
|
break;
|
|
case 0x05C2: // SIN DOT
|
|
if (a == 0x05E9) { // SHIN
|
|
*ab = 0xFB2B;
|
|
found = true;
|
|
} else if (a == 0xFB49) { // SHIN WITH DAGESH
|
|
*ab = 0xFB2D;
|
|
found = true;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
return found;
|
|
}
|
|
|
|
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)
|
|
{
|
|
return nsUnicodeNormalizer::DecomposeNonRecursively(ab, a, b);
|
|
}
|
|
|
|
static PLDHashOperator
|
|
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);
|
|
return PL_DHASH_NEXT;
|
|
}
|
|
|
|
/*
|
|
* 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::ShapeText(gfxContext *aContext,
|
|
const char16_t *aText,
|
|
uint32_t aOffset,
|
|
uint32_t aLength,
|
|
int32_t aScript,
|
|
gfxShapedText *aShapedText)
|
|
{
|
|
// some font back-ends require this in order to get proper hinted metrics
|
|
if (!mFont->SetupCairoFont(aContext)) {
|
|
return false;
|
|
}
|
|
|
|
mCallbackData.mContext = aContext;
|
|
gfxFontEntry *entry = mFont->GetFontEntry();
|
|
|
|
if (!mInitialized) {
|
|
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_glyph_func(sHBFontFuncs, HBGetGlyph,
|
|
nullptr, nullptr);
|
|
hb_font_funcs_set_glyph_h_advance_func(sHBFontFuncs,
|
|
HBGetGlyphHAdvance,
|
|
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_eastasian_width_func(sHBUnicodeFuncs,
|
|
HBGetEastAsianWidth,
|
|
nullptr, nullptr);
|
|
hb_unicode_funcs_set_compose_func(sHBUnicodeFuncs,
|
|
HBUnicodeCompose,
|
|
nullptr, nullptr);
|
|
hb_unicode_funcs_set_decompose_func(sHBUnicodeFuncs,
|
|
HBUnicodeDecompose,
|
|
nullptr, nullptr);
|
|
}
|
|
|
|
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 (!mUseFontGlyphWidths) {
|
|
// if font doesn't implement GetGlyphWidth, we will be reading
|
|
// the hmtx table directly;
|
|
// read mNumLongMetrics from hhea table without caching its blob,
|
|
// and preload/cache the hmtx table
|
|
gfxFontEntry::AutoTable hheaTable(entry, TRUETYPE_TAG('h','h','e','a'));
|
|
if (hheaTable) {
|
|
uint32_t len;
|
|
const HMetricsHeader* hhea =
|
|
reinterpret_cast<const HMetricsHeader*>
|
|
(hb_blob_get_data(hheaTable, &len));
|
|
if (len >= sizeof(HMetricsHeader)) {
|
|
mNumLongMetrics = hhea->numberOfHMetrics;
|
|
if (mNumLongMetrics > 0 &&
|
|
int16_t(hhea->metricDataFormat) == 0) {
|
|
// no point reading hmtx 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 mHmtx is null)
|
|
mHmtxTable =
|
|
entry->GetFontTable(TRUETYPE_TAG('h','m','t','x'));
|
|
if (hb_blob_get_length(mHmtxTable) <
|
|
mNumLongMetrics * sizeof(HLongMetric)) {
|
|
// hmtx table is not large enough for the claimed
|
|
// number of entries: invalid, do not use.
|
|
hb_blob_destroy(mHmtxTable);
|
|
mHmtxTable = nullptr;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
if ((!mUseFontGetGlyph && mCmapFormat <= 0) ||
|
|
(!mUseFontGlyphWidths && !mHmtxTable)) {
|
|
// unable to shape with this font
|
|
return false;
|
|
}
|
|
|
|
const gfxFontStyle *style = mFont->GetStyle();
|
|
|
|
nsAutoTArray<hb_feature_t,20> features;
|
|
nsDataHashtable<nsUint32HashKey,uint32_t> mergedFeatures;
|
|
|
|
if (MergeFontFeatures(style,
|
|
entry->mFeatureSettings,
|
|
aShapedText->DisableLigatures(),
|
|
entry->FamilyName(),
|
|
mergedFeatures))
|
|
{
|
|
// enumerate result and insert into hb_feature array
|
|
mergedFeatures.Enumerate(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, isRightToLeft ? HB_DIRECTION_RTL :
|
|
HB_DIRECTION_LTR);
|
|
hb_script_t scriptTag;
|
|
if (aShapedText->Flags() & gfxTextRunFactory::TEXT_USE_MATH_SCRIPT) {
|
|
scriptTag = sMathScript;
|
|
} else if (aScript <= MOZ_SCRIPT_INHERITED) {
|
|
// For unresolved "common" or "inherited" runs, default to Latin for
|
|
// now. (Should we somehow use the language or locale to try and infer
|
|
// a better default?)
|
|
scriptTag = HB_SCRIPT_LATIN;
|
|
} else {
|
|
scriptTag = hb_script_t(GetScriptTagForCode(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 {
|
|
nsCString langString;
|
|
style->language->ToUTF8String(langString);
|
|
language =
|
|
hb_language_from_string(langString.get(), langString.Length());
|
|
}
|
|
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_shape(mHBFont, buffer, features.Elements(), features.Length());
|
|
|
|
if (isRightToLeft) {
|
|
hb_buffer_reverse(buffer);
|
|
}
|
|
|
|
nsresult rv = SetGlyphsFromRun(aContext, aShapedText, aOffset, aLength,
|
|
aText, buffer);
|
|
|
|
NS_WARN_IF_FALSE(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(gfxContext *aContext,
|
|
gfxShapedText *aShapedText,
|
|
uint32_t aOffset,
|
|
uint32_t aLength,
|
|
const char16_t *aText,
|
|
hb_buffer_t *aBuffer)
|
|
{
|
|
uint32_t numGlyphs;
|
|
const hb_glyph_info_t *ginfo = hb_buffer_get_glyph_infos(aBuffer, &numGlyphs);
|
|
if (numGlyphs == 0) {
|
|
return NS_OK;
|
|
}
|
|
|
|
nsAutoTArray<gfxTextRun::DetailedGlyph,1> detailedGlyphs;
|
|
|
|
uint32_t wordLength = aLength;
|
|
static const int32_t NO_GLYPH = -1;
|
|
AutoFallibleTArray<int32_t,SMALL_GLYPH_RUN> charToGlyphArray;
|
|
if (!charToGlyphArray.SetLength(wordLength)) {
|
|
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 roundX;
|
|
bool roundY;
|
|
aContext->GetRoundOffsetsToPixels(&roundX, &roundY);
|
|
|
|
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 x_residual = 0;
|
|
|
|
// keep track of y-position to set glyph offsets if needed
|
|
nscoord yPos = 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;
|
|
}
|
|
|
|
hb_position_t x_offset = posInfo[glyphStart].x_offset;
|
|
hb_position_t x_advance = posInfo[glyphStart].x_advance;
|
|
nscoord xOffset, advance;
|
|
if (roundX) {
|
|
xOffset =
|
|
appUnitsPerDevUnit * FixedToIntRound(x_offset + x_residual);
|
|
// Desired distance from the base glyph to the next reference point.
|
|
hb_position_t width = x_advance - x_offset;
|
|
int intWidth = FixedToIntRound(width);
|
|
x_residual = width - FloatToFixed(intWidth);
|
|
advance = appUnitsPerDevUnit * intWidth + xOffset;
|
|
} else {
|
|
xOffset = floor(hb2appUnits * x_offset + 0.5);
|
|
advance = floor(hb2appUnits * x_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() &&
|
|
xOffset == 0 &&
|
|
posInfo[glyphStart].y_offset == 0 && yPos == 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
|
|
while (1) {
|
|
gfxTextRun::DetailedGlyph* details =
|
|
detailedGlyphs.AppendElement();
|
|
details->mGlyphID = ginfo[glyphStart].codepoint;
|
|
|
|
details->mXOffset = xOffset;
|
|
details->mAdvance = advance;
|
|
|
|
hb_position_t y_offset = posInfo[glyphStart].y_offset;
|
|
details->mYOffset = yPos -
|
|
(roundY ? appUnitsPerDevUnit * FixedToIntRound(y_offset)
|
|
: floor(hb2appUnits * y_offset + 0.5));
|
|
|
|
hb_position_t y_advance = posInfo[glyphStart].y_advance;
|
|
if (y_advance != 0) {
|
|
yPos -=
|
|
roundY ? appUnitsPerDevUnit * FixedToIntRound(y_advance)
|
|
: floor(hb2appUnits * y_advance + 0.5);
|
|
}
|
|
if (++glyphStart >= glyphEnd) {
|
|
break;
|
|
}
|
|
|
|
x_offset = posInfo[glyphStart].x_offset;
|
|
x_advance = posInfo[glyphStart].x_advance;
|
|
if (roundX) {
|
|
xOffset = appUnitsPerDevUnit *
|
|
FixedToIntRound(x_offset + x_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.
|
|
x_advance += x_residual;
|
|
int intAdvance = FixedToIntRound(x_advance);
|
|
x_residual = x_advance - FloatToFixed(intAdvance);
|
|
advance = appUnitsPerDevUnit * intAdvance;
|
|
} else {
|
|
xOffset = floor(hb2appUnits * x_offset + 0.5);
|
|
advance = floor(hb2appUnits * x_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;
|
|
}
|