summaryrefslogtreecommitdiffstats
path: root/gfx/thebes/gfxFontUtils.h
diff options
context:
space:
mode:
Diffstat (limited to 'gfx/thebes/gfxFontUtils.h')
-rw-r--r--gfx/thebes/gfxFontUtils.h1027
1 files changed, 1027 insertions, 0 deletions
diff --git a/gfx/thebes/gfxFontUtils.h b/gfx/thebes/gfxFontUtils.h
new file mode 100644
index 000000000..dd6a76558
--- /dev/null
+++ b/gfx/thebes/gfxFontUtils.h
@@ -0,0 +1,1027 @@
+/* -*- 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/. */
+
+#ifndef GFX_FONT_UTILS_H
+#define GFX_FONT_UTILS_H
+
+#include "gfxPlatform.h"
+#include "nsComponentManagerUtils.h"
+#include "nsTArray.h"
+#include "mozilla/Likely.h"
+#include "mozilla/EndianUtils.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/UniquePtr.h"
+
+#include "zlib.h"
+#include <algorithm>
+
+/* Bug 341128 - w32api defines min/max which causes problems with <bitset> */
+#ifdef __MINGW32__
+#undef min
+#undef max
+#endif
+
+typedef struct hb_blob_t hb_blob_t;
+
+class gfxSparseBitSet {
+private:
+ enum { BLOCK_SIZE = 32 }; // ==> 256 codepoints per block
+ enum { BLOCK_SIZE_BITS = BLOCK_SIZE * 8 };
+ enum { BLOCK_INDEX_SHIFT = 8 };
+
+ struct Block {
+ Block(const Block& aBlock) { memcpy(mBits, aBlock.mBits, sizeof(mBits)); }
+ explicit Block(unsigned char memsetValue = 0) { memset(mBits, memsetValue, BLOCK_SIZE); }
+ uint8_t mBits[BLOCK_SIZE];
+ };
+
+public:
+ gfxSparseBitSet() { }
+ gfxSparseBitSet(const gfxSparseBitSet& aBitset) {
+ uint32_t len = aBitset.mBlocks.Length();
+ mBlocks.AppendElements(len);
+ for (uint32_t i = 0; i < len; ++i) {
+ Block *block = aBitset.mBlocks[i].get();
+ if (block) {
+ mBlocks[i] = mozilla::MakeUnique<Block>(*block);
+ }
+ }
+ }
+
+ bool Equals(const gfxSparseBitSet *aOther) const {
+ if (mBlocks.Length() != aOther->mBlocks.Length()) {
+ return false;
+ }
+ size_t n = mBlocks.Length();
+ for (size_t i = 0; i < n; ++i) {
+ const Block *b1 = mBlocks[i].get();
+ const Block *b2 = aOther->mBlocks[i].get();
+ if (!b1 != !b2) {
+ return false;
+ }
+ if (!b1) {
+ continue;
+ }
+ if (memcmp(&b1->mBits, &b2->mBits, BLOCK_SIZE) != 0) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ bool test(uint32_t aIndex) const {
+ NS_ASSERTION(mBlocks.DebugGetHeader(), "mHdr is null, this is bad");
+ uint32_t blockIndex = aIndex/BLOCK_SIZE_BITS;
+ if (blockIndex >= mBlocks.Length()) {
+ return false;
+ }
+ const Block *block = mBlocks[blockIndex].get();
+ if (!block) {
+ return false;
+ }
+ return ((block->mBits[(aIndex>>3) & (BLOCK_SIZE - 1)]) & (1 << (aIndex & 0x7))) != 0;
+ }
+
+ // dump out contents of bitmap
+ void Dump(const char* aPrefix, eGfxLog aWhichLog) const;
+
+ bool TestRange(uint32_t aStart, uint32_t aEnd) {
+ uint32_t startBlock, endBlock, blockLen;
+
+ // start point is beyond the end of the block array? return false immediately
+ startBlock = aStart >> BLOCK_INDEX_SHIFT;
+ blockLen = mBlocks.Length();
+ if (startBlock >= blockLen) return false;
+
+ // check for blocks in range, if none, return false
+ uint32_t blockIndex;
+ bool hasBlocksInRange = false;
+
+ endBlock = aEnd >> BLOCK_INDEX_SHIFT;
+ for (blockIndex = startBlock; blockIndex <= endBlock; blockIndex++) {
+ if (blockIndex < blockLen && mBlocks[blockIndex]) {
+ hasBlocksInRange = true;
+ }
+ }
+ if (!hasBlocksInRange) {
+ return false;
+ }
+
+ Block *block;
+ uint32_t i, start, end;
+
+ // first block, check bits
+ if ((block = mBlocks[startBlock].get())) {
+ start = aStart;
+ end = std::min(aEnd, ((startBlock+1) << BLOCK_INDEX_SHIFT) - 1);
+ for (i = start; i <= end; i++) {
+ if ((block->mBits[(i>>3) & (BLOCK_SIZE - 1)]) & (1 << (i & 0x7))) {
+ return true;
+ }
+ }
+ }
+ if (endBlock == startBlock) {
+ return false;
+ }
+
+ // [2..n-1] blocks check bytes
+ for (blockIndex = startBlock + 1; blockIndex < endBlock; blockIndex++) {
+ uint32_t index;
+
+ if (blockIndex >= blockLen ||
+ !(block = mBlocks[blockIndex].get())) {
+ continue;
+ }
+ for (index = 0; index < BLOCK_SIZE; index++) {
+ if (block->mBits[index]) {
+ return true;
+ }
+ }
+ }
+
+ // last block, check bits
+ if (endBlock < blockLen && (block = mBlocks[endBlock].get())) {
+ start = endBlock << BLOCK_INDEX_SHIFT;
+ end = aEnd;
+ for (i = start; i <= end; i++) {
+ if ((block->mBits[(i>>3) & (BLOCK_SIZE - 1)]) & (1 << (i & 0x7))) {
+ return true;
+ }
+ }
+ }
+
+ return false;
+ }
+
+ void set(uint32_t aIndex) {
+ uint32_t blockIndex = aIndex/BLOCK_SIZE_BITS;
+ if (blockIndex >= mBlocks.Length()) {
+ mBlocks.AppendElements(blockIndex + 1 - mBlocks.Length());
+ }
+ Block *block = mBlocks[blockIndex].get();
+ if (!block) {
+ block = new Block;
+ mBlocks[blockIndex].reset(block);
+ }
+ block->mBits[(aIndex>>3) & (BLOCK_SIZE - 1)] |= 1 << (aIndex & 0x7);
+ }
+
+ void set(uint32_t aIndex, bool aValue) {
+ if (aValue)
+ set(aIndex);
+ else
+ clear(aIndex);
+ }
+
+ void SetRange(uint32_t aStart, uint32_t aEnd) {
+ const uint32_t startIndex = aStart/BLOCK_SIZE_BITS;
+ const uint32_t endIndex = aEnd/BLOCK_SIZE_BITS;
+
+ if (endIndex >= mBlocks.Length()) {
+ uint32_t numNewBlocks = endIndex + 1 - mBlocks.Length();
+ mBlocks.AppendElements(numNewBlocks);
+ }
+
+ for (uint32_t i = startIndex; i <= endIndex; ++i) {
+ const uint32_t blockFirstBit = i * BLOCK_SIZE_BITS;
+ const uint32_t blockLastBit = blockFirstBit + BLOCK_SIZE_BITS - 1;
+
+ Block *block = mBlocks[i].get();
+ if (!block) {
+ bool fullBlock =
+ (aStart <= blockFirstBit && aEnd >= blockLastBit);
+
+ block = new Block(fullBlock ? 0xFF : 0);
+ mBlocks[i].reset(block);
+
+ if (fullBlock) {
+ continue;
+ }
+ }
+
+ const uint32_t start = aStart > blockFirstBit ? aStart - blockFirstBit : 0;
+ const uint32_t end = std::min<uint32_t>(aEnd - blockFirstBit, BLOCK_SIZE_BITS - 1);
+
+ for (uint32_t bit = start; bit <= end; ++bit) {
+ block->mBits[bit>>3] |= 1 << (bit & 0x7);
+ }
+ }
+ }
+
+ void clear(uint32_t aIndex) {
+ uint32_t blockIndex = aIndex/BLOCK_SIZE_BITS;
+ if (blockIndex >= mBlocks.Length()) {
+ mBlocks.AppendElements(blockIndex + 1 - mBlocks.Length());
+ }
+ Block *block = mBlocks[blockIndex].get();
+ if (!block) {
+ return;
+ }
+ block->mBits[(aIndex>>3) & (BLOCK_SIZE - 1)] &= ~(1 << (aIndex & 0x7));
+ }
+
+ void ClearRange(uint32_t aStart, uint32_t aEnd) {
+ const uint32_t startIndex = aStart/BLOCK_SIZE_BITS;
+ const uint32_t endIndex = aEnd/BLOCK_SIZE_BITS;
+
+ if (endIndex >= mBlocks.Length()) {
+ uint32_t numNewBlocks = endIndex + 1 - mBlocks.Length();
+ mBlocks.AppendElements(numNewBlocks);
+ }
+
+ for (uint32_t i = startIndex; i <= endIndex; ++i) {
+ const uint32_t blockFirstBit = i * BLOCK_SIZE_BITS;
+
+ Block *block = mBlocks[i].get();
+ if (!block) {
+ // any nonexistent block is implicitly all clear,
+ // so there's no need to even create it
+ continue;
+ }
+
+ const uint32_t start = aStart > blockFirstBit ? aStart - blockFirstBit : 0;
+ const uint32_t end = std::min<uint32_t>(aEnd - blockFirstBit, BLOCK_SIZE_BITS - 1);
+
+ for (uint32_t bit = start; bit <= end; ++bit) {
+ block->mBits[bit>>3] &= ~(1 << (bit & 0x7));
+ }
+ }
+ }
+
+ size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
+ size_t total = mBlocks.ShallowSizeOfExcludingThis(aMallocSizeOf);
+ for (uint32_t i = 0; i < mBlocks.Length(); i++) {
+ if (mBlocks[i]) {
+ total += aMallocSizeOf(mBlocks[i].get());
+ }
+ }
+ return total;
+ }
+
+ size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
+ return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
+ }
+
+ // clear out all blocks in the array
+ void reset() {
+ uint32_t i;
+ for (i = 0; i < mBlocks.Length(); i++) {
+ mBlocks[i] = nullptr;
+ }
+ }
+
+ // set this bitset to the union of its current contents and another
+ void Union(const gfxSparseBitSet& aBitset) {
+ // ensure mBlocks is large enough
+ uint32_t blockCount = aBitset.mBlocks.Length();
+ if (blockCount > mBlocks.Length()) {
+ uint32_t needed = blockCount - mBlocks.Length();
+ mBlocks.AppendElements(needed);
+ }
+ // for each block that may be present in aBitset...
+ for (uint32_t i = 0; i < blockCount; ++i) {
+ // if it is missing (implicitly empty), just skip
+ if (!aBitset.mBlocks[i]) {
+ continue;
+ }
+ // if the block is missing in this set, just copy the other
+ if (!mBlocks[i]) {
+ mBlocks[i] = mozilla::MakeUnique<Block>(*aBitset.mBlocks[i]);
+ continue;
+ }
+ // else set existing block to the union of both
+ uint32_t *dst = reinterpret_cast<uint32_t*>(mBlocks[i]->mBits);
+ const uint32_t *src =
+ reinterpret_cast<const uint32_t*>(aBitset.mBlocks[i]->mBits);
+ for (uint32_t j = 0; j < BLOCK_SIZE / 4; ++j) {
+ dst[j] |= src[j];
+ }
+ }
+ }
+
+ void Compact() {
+ mBlocks.Compact();
+ }
+
+ uint32_t GetChecksum() const {
+ uint32_t check = adler32(0, Z_NULL, 0);
+ for (uint32_t i = 0; i < mBlocks.Length(); i++) {
+ if (mBlocks[i]) {
+ const Block *block = mBlocks[i].get();
+ check = adler32(check, (uint8_t*) (&i), 4);
+ check = adler32(check, (uint8_t*) block, sizeof(Block));
+ }
+ }
+ return check;
+ }
+
+private:
+ nsTArray<mozilla::UniquePtr<Block>> mBlocks;
+};
+
+#define TRUETYPE_TAG(a, b, c, d) ((a) << 24 | (b) << 16 | (c) << 8 | (d))
+
+namespace mozilla {
+
+// Byte-swapping types and name table structure definitions moved from
+// gfxFontUtils.cpp to .h file so that gfxFont.cpp can also refer to them
+#pragma pack(1)
+
+struct AutoSwap_PRUint16 {
+#ifdef __SUNPRO_CC
+ AutoSwap_PRUint16& operator = (const uint16_t aValue)
+ {
+ this->value = mozilla::NativeEndian::swapToBigEndian(aValue);
+ return *this;
+ }
+#else
+ MOZ_IMPLICIT AutoSwap_PRUint16(uint16_t aValue)
+ {
+ value = mozilla::NativeEndian::swapToBigEndian(aValue);
+ }
+#endif
+ operator uint16_t() const
+ {
+ return mozilla::NativeEndian::swapFromBigEndian(value);
+ }
+
+ operator uint32_t() const
+ {
+ return mozilla::NativeEndian::swapFromBigEndian(value);
+ }
+
+ operator uint64_t() const
+ {
+ return mozilla::NativeEndian::swapFromBigEndian(value);
+ }
+
+private:
+ uint16_t value;
+};
+
+struct AutoSwap_PRInt16 {
+#ifdef __SUNPRO_CC
+ AutoSwap_PRInt16& operator = (const int16_t aValue)
+ {
+ this->value = mozilla::NativeEndian::swapToBigEndian(aValue);
+ return *this;
+ }
+#else
+ MOZ_IMPLICIT AutoSwap_PRInt16(int16_t aValue)
+ {
+ value = mozilla::NativeEndian::swapToBigEndian(aValue);
+ }
+#endif
+ operator int16_t() const
+ {
+ return mozilla::NativeEndian::swapFromBigEndian(value);
+ }
+
+ operator uint32_t() const
+ {
+ return mozilla::NativeEndian::swapFromBigEndian(value);
+ }
+
+private:
+ int16_t value;
+};
+
+struct AutoSwap_PRUint32 {
+#ifdef __SUNPRO_CC
+ AutoSwap_PRUint32& operator = (const uint32_t aValue)
+ {
+ this->value = mozilla::NativeEndian::swapToBigEndian(aValue);
+ return *this;
+ }
+#else
+ MOZ_IMPLICIT AutoSwap_PRUint32(uint32_t aValue)
+ {
+ value = mozilla::NativeEndian::swapToBigEndian(aValue);
+ }
+#endif
+ operator uint32_t() const
+ {
+ return mozilla::NativeEndian::swapFromBigEndian(value);
+ }
+
+private:
+ uint32_t value;
+};
+
+struct AutoSwap_PRInt32 {
+#ifdef __SUNPRO_CC
+ AutoSwap_PRInt32& operator = (const int32_t aValue)
+ {
+ this->value = mozilla::NativeEndian::swapToBigEndian(aValue);
+ return *this;
+ }
+#else
+ MOZ_IMPLICIT AutoSwap_PRInt32(int32_t aValue)
+ {
+ value = mozilla::NativeEndian::swapToBigEndian(aValue);
+ }
+#endif
+ operator int32_t() const
+ {
+ return mozilla::NativeEndian::swapFromBigEndian(value);
+ }
+
+private:
+ int32_t value;
+};
+
+struct AutoSwap_PRUint64 {
+#ifdef __SUNPRO_CC
+ AutoSwap_PRUint64& operator = (const uint64_t aValue)
+ {
+ this->value = mozilla::NativeEndian::swapToBigEndian(aValue);
+ return *this;
+ }
+#else
+ MOZ_IMPLICIT AutoSwap_PRUint64(uint64_t aValue)
+ {
+ value = mozilla::NativeEndian::swapToBigEndian(aValue);
+ }
+#endif
+ operator uint64_t() const
+ {
+ return mozilla::NativeEndian::swapFromBigEndian(value);
+ }
+
+private:
+ uint64_t value;
+};
+
+struct AutoSwap_PRUint24 {
+ operator uint32_t() const { return value[0] << 16 | value[1] << 8 | value[2]; }
+private:
+ AutoSwap_PRUint24() { }
+ uint8_t value[3];
+};
+
+struct SFNTHeader {
+ AutoSwap_PRUint32 sfntVersion; // Fixed, 0x00010000 for version 1.0.
+ AutoSwap_PRUint16 numTables; // Number of tables.
+ AutoSwap_PRUint16 searchRange; // (Maximum power of 2 <= numTables) x 16.
+ AutoSwap_PRUint16 entrySelector; // Log2(maximum power of 2 <= numTables).
+ AutoSwap_PRUint16 rangeShift; // NumTables x 16-searchRange.
+};
+
+struct TableDirEntry {
+ AutoSwap_PRUint32 tag; // 4 -byte identifier.
+ AutoSwap_PRUint32 checkSum; // CheckSum for this table.
+ AutoSwap_PRUint32 offset; // Offset from beginning of TrueType font file.
+ AutoSwap_PRUint32 length; // Length of this table.
+};
+
+struct HeadTable {
+ enum {
+ HEAD_VERSION = 0x00010000,
+ HEAD_MAGIC_NUMBER = 0x5F0F3CF5,
+ HEAD_CHECKSUM_CALC_CONST = 0xB1B0AFBA
+ };
+
+ AutoSwap_PRUint32 tableVersionNumber; // Fixed, 0x00010000 for version 1.0.
+ AutoSwap_PRUint32 fontRevision; // Set by font manufacturer.
+ AutoSwap_PRUint32 checkSumAdjustment; // To compute: set it to 0, sum the entire font as ULONG, then store 0xB1B0AFBA - sum.
+ AutoSwap_PRUint32 magicNumber; // Set to 0x5F0F3CF5.
+ AutoSwap_PRUint16 flags;
+ AutoSwap_PRUint16 unitsPerEm; // Valid range is from 16 to 16384. This value should be a power of 2 for fonts that have TrueType outlines.
+ AutoSwap_PRUint64 created; // Number of seconds since 12:00 midnight, January 1, 1904. 64-bit integer
+ AutoSwap_PRUint64 modified; // Number of seconds since 12:00 midnight, January 1, 1904. 64-bit integer
+ AutoSwap_PRInt16 xMin; // For all glyph bounding boxes.
+ AutoSwap_PRInt16 yMin; // For all glyph bounding boxes.
+ AutoSwap_PRInt16 xMax; // For all glyph bounding boxes.
+ AutoSwap_PRInt16 yMax; // For all glyph bounding boxes.
+ AutoSwap_PRUint16 macStyle; // Bit 0: Bold (if set to 1);
+ AutoSwap_PRUint16 lowestRecPPEM; // Smallest readable size in pixels.
+ AutoSwap_PRInt16 fontDirectionHint;
+ AutoSwap_PRInt16 indexToLocFormat;
+ AutoSwap_PRInt16 glyphDataFormat;
+};
+
+struct OS2Table {
+ AutoSwap_PRUint16 version; // 0004 = OpenType 1.5
+ AutoSwap_PRInt16 xAvgCharWidth;
+ AutoSwap_PRUint16 usWeightClass;
+ AutoSwap_PRUint16 usWidthClass;
+ AutoSwap_PRUint16 fsType;
+ AutoSwap_PRInt16 ySubscriptXSize;
+ AutoSwap_PRInt16 ySubscriptYSize;
+ AutoSwap_PRInt16 ySubscriptXOffset;
+ AutoSwap_PRInt16 ySubscriptYOffset;
+ AutoSwap_PRInt16 ySuperscriptXSize;
+ AutoSwap_PRInt16 ySuperscriptYSize;
+ AutoSwap_PRInt16 ySuperscriptXOffset;
+ AutoSwap_PRInt16 ySuperscriptYOffset;
+ AutoSwap_PRInt16 yStrikeoutSize;
+ AutoSwap_PRInt16 yStrikeoutPosition;
+ AutoSwap_PRInt16 sFamilyClass;
+ uint8_t panose[10];
+ AutoSwap_PRUint32 unicodeRange1;
+ AutoSwap_PRUint32 unicodeRange2;
+ AutoSwap_PRUint32 unicodeRange3;
+ AutoSwap_PRUint32 unicodeRange4;
+ uint8_t achVendID[4];
+ AutoSwap_PRUint16 fsSelection;
+ AutoSwap_PRUint16 usFirstCharIndex;
+ AutoSwap_PRUint16 usLastCharIndex;
+ AutoSwap_PRInt16 sTypoAscender;
+ AutoSwap_PRInt16 sTypoDescender;
+ AutoSwap_PRInt16 sTypoLineGap;
+ AutoSwap_PRUint16 usWinAscent;
+ AutoSwap_PRUint16 usWinDescent;
+ AutoSwap_PRUint32 codePageRange1;
+ AutoSwap_PRUint32 codePageRange2;
+ AutoSwap_PRInt16 sxHeight;
+ AutoSwap_PRInt16 sCapHeight;
+ AutoSwap_PRUint16 usDefaultChar;
+ AutoSwap_PRUint16 usBreakChar;
+ AutoSwap_PRUint16 usMaxContext;
+};
+
+struct PostTable {
+ AutoSwap_PRUint32 version;
+ AutoSwap_PRInt32 italicAngle;
+ AutoSwap_PRInt16 underlinePosition;
+ AutoSwap_PRUint16 underlineThickness;
+ AutoSwap_PRUint32 isFixedPitch;
+ AutoSwap_PRUint32 minMemType42;
+ AutoSwap_PRUint32 maxMemType42;
+ AutoSwap_PRUint32 minMemType1;
+ AutoSwap_PRUint32 maxMemType1;
+};
+
+// This structure is used for both 'hhea' and 'vhea' tables.
+// The field names here are those of the horizontal version; the
+// vertical table just exchanges vertical and horizontal coordinates.
+struct MetricsHeader {
+ AutoSwap_PRUint32 version;
+ 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 reserved1;
+ AutoSwap_PRInt16 reserved2;
+ AutoSwap_PRInt16 reserved3;
+ AutoSwap_PRInt16 reserved4;
+ AutoSwap_PRInt16 metricDataFormat;
+ AutoSwap_PRUint16 numOfLongMetrics;
+};
+
+struct MaxpTableHeader {
+ AutoSwap_PRUint32 version; // CFF: 0x00005000; TrueType: 0x00010000
+ AutoSwap_PRUint16 numGlyphs;
+// truetype version has additional fields that we don't currently use
+};
+
+// old 'kern' table, supported on Windows
+// see http://www.microsoft.com/typography/otspec/kern.htm
+struct KernTableVersion0 {
+ AutoSwap_PRUint16 version; // 0x0000
+ AutoSwap_PRUint16 nTables;
+};
+
+struct KernTableSubtableHeaderVersion0 {
+ AutoSwap_PRUint16 version;
+ AutoSwap_PRUint16 length;
+ AutoSwap_PRUint16 coverage;
+};
+
+// newer Mac-only 'kern' table, ignored by Windows
+// see http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6kern.html
+struct KernTableVersion1 {
+ AutoSwap_PRUint32 version; // 0x00010000
+ AutoSwap_PRUint32 nTables;
+};
+
+struct KernTableSubtableHeaderVersion1 {
+ AutoSwap_PRUint32 length;
+ AutoSwap_PRUint16 coverage;
+ AutoSwap_PRUint16 tupleIndex;
+};
+
+struct COLRHeader {
+ AutoSwap_PRUint16 version;
+ AutoSwap_PRUint16 numBaseGlyphRecord;
+ AutoSwap_PRUint32 offsetBaseGlyphRecord;
+ AutoSwap_PRUint32 offsetLayerRecord;
+ AutoSwap_PRUint16 numLayerRecords;
+};
+
+struct CPALHeaderVersion0 {
+ AutoSwap_PRUint16 version;
+ AutoSwap_PRUint16 numPaletteEntries;
+ AutoSwap_PRUint16 numPalettes;
+ AutoSwap_PRUint16 numColorRecords;
+ AutoSwap_PRUint32 offsetFirstColorRecord;
+};
+
+#pragma pack()
+
+// Return just the highest bit of the given value, i.e., the highest
+// power of 2 that is <= value, or zero if the input value is zero.
+inline uint32_t
+FindHighestBit(uint32_t value)
+{
+ // propagate highest bit into all lower bits of the value
+ value |= (value >> 1);
+ value |= (value >> 2);
+ value |= (value >> 4);
+ value |= (value >> 8);
+ value |= (value >> 16);
+ // isolate the leftmost bit
+ return (value & ~(value >> 1));
+}
+
+} // namespace mozilla
+
+// used for overlaying name changes without touching original font data
+struct FontDataOverlay {
+ // overlaySrc != 0 ==> use overlay
+ uint32_t overlaySrc; // src offset from start of font data
+ uint32_t overlaySrcLen; // src length
+ uint32_t overlayDest; // dest offset from start of font data
+};
+
+enum gfxUserFontType {
+ GFX_USERFONT_UNKNOWN = 0,
+ GFX_USERFONT_OPENTYPE = 1,
+ GFX_USERFONT_SVG = 2,
+ GFX_USERFONT_WOFF = 3,
+ GFX_USERFONT_WOFF2 = 4
+};
+#define GFX_PREF_WOFF2_ENABLED "gfx.downloadable_fonts.woff2.enabled"
+
+extern const uint8_t sCJKCompatSVSTable[];
+
+class gfxFontUtils {
+
+public:
+ // these are public because gfxFont.cpp also looks into the name table
+ enum {
+ NAME_ID_FAMILY = 1,
+ NAME_ID_STYLE = 2,
+ NAME_ID_UNIQUE = 3,
+ NAME_ID_FULL = 4,
+ NAME_ID_VERSION = 5,
+ NAME_ID_POSTSCRIPT = 6,
+ NAME_ID_PREFERRED_FAMILY = 16,
+ NAME_ID_PREFERRED_STYLE = 17,
+
+ PLATFORM_ALL = -1,
+ PLATFORM_ID_UNICODE = 0, // Mac OS uses this typically
+ PLATFORM_ID_MAC = 1,
+ PLATFORM_ID_ISO = 2,
+ PLATFORM_ID_MICROSOFT = 3,
+
+ ENCODING_ID_MAC_ROMAN = 0, // traditional Mac OS script manager encodings
+ ENCODING_ID_MAC_JAPANESE = 1, // (there are others defined, but some were never
+ ENCODING_ID_MAC_TRAD_CHINESE = 2, // implemented by Apple, and I have never seen them
+ ENCODING_ID_MAC_KOREAN = 3, // used in font names)
+ ENCODING_ID_MAC_ARABIC = 4,
+ ENCODING_ID_MAC_HEBREW = 5,
+ ENCODING_ID_MAC_GREEK = 6,
+ ENCODING_ID_MAC_CYRILLIC = 7,
+ ENCODING_ID_MAC_DEVANAGARI = 9,
+ ENCODING_ID_MAC_GURMUKHI = 10,
+ ENCODING_ID_MAC_GUJARATI = 11,
+ ENCODING_ID_MAC_SIMP_CHINESE = 25,
+
+ ENCODING_ID_MICROSOFT_SYMBOL = 0, // Microsoft platform encoding IDs
+ ENCODING_ID_MICROSOFT_UNICODEBMP = 1,
+ ENCODING_ID_MICROSOFT_SHIFTJIS = 2,
+ ENCODING_ID_MICROSOFT_PRC = 3,
+ ENCODING_ID_MICROSOFT_BIG5 = 4,
+ ENCODING_ID_MICROSOFT_WANSUNG = 5,
+ ENCODING_ID_MICROSOFT_JOHAB = 6,
+ ENCODING_ID_MICROSOFT_UNICODEFULL = 10,
+
+ LANG_ALL = -1,
+ LANG_ID_MAC_ENGLISH = 0, // many others are defined, but most don't affect
+ LANG_ID_MAC_HEBREW = 10, // the charset; should check all the central/eastern
+ LANG_ID_MAC_JAPANESE = 11, // european codes, though
+ LANG_ID_MAC_ARABIC = 12,
+ LANG_ID_MAC_ICELANDIC = 15,
+ LANG_ID_MAC_TURKISH = 17,
+ LANG_ID_MAC_TRAD_CHINESE = 19,
+ LANG_ID_MAC_URDU = 20,
+ LANG_ID_MAC_KOREAN = 23,
+ LANG_ID_MAC_POLISH = 25,
+ LANG_ID_MAC_FARSI = 31,
+ LANG_ID_MAC_SIMP_CHINESE = 33,
+ LANG_ID_MAC_ROMANIAN = 37,
+ LANG_ID_MAC_CZECH = 38,
+ LANG_ID_MAC_SLOVAK = 39,
+
+ LANG_ID_MICROSOFT_EN_US = 0x0409, // with Microsoft platformID, EN US lang code
+
+ CMAP_MAX_CODEPOINT = 0x10ffff // maximum possible Unicode codepoint
+ // contained in a cmap
+ };
+
+ // name table has a header, followed by name records, followed by string data
+ struct NameHeader {
+ mozilla::AutoSwap_PRUint16 format; // Format selector (=0).
+ mozilla::AutoSwap_PRUint16 count; // Number of name records.
+ mozilla::AutoSwap_PRUint16 stringOffset; // Offset to start of string storage
+ // (from start of table)
+ };
+
+ struct NameRecord {
+ mozilla::AutoSwap_PRUint16 platformID; // Platform ID
+ mozilla::AutoSwap_PRUint16 encodingID; // Platform-specific encoding ID
+ mozilla::AutoSwap_PRUint16 languageID; // Language ID
+ mozilla::AutoSwap_PRUint16 nameID; // Name ID.
+ mozilla::AutoSwap_PRUint16 length; // String length (in bytes).
+ mozilla::AutoSwap_PRUint16 offset; // String offset from start of storage
+ // (in bytes).
+ };
+
+ // for reading big-endian font data on either big or little-endian platforms
+
+ static inline uint16_t
+ ReadShortAt(const uint8_t *aBuf, uint32_t aIndex)
+ {
+ return (aBuf[aIndex] << 8) | aBuf[aIndex + 1];
+ }
+
+ static inline uint16_t
+ ReadShortAt16(const uint16_t *aBuf, uint32_t aIndex)
+ {
+ const uint8_t *buf = reinterpret_cast<const uint8_t*>(aBuf);
+ uint32_t index = aIndex << 1;
+ return (buf[index] << 8) | buf[index+1];
+ }
+
+ static inline uint32_t
+ ReadUint24At(const uint8_t *aBuf, uint32_t aIndex)
+ {
+ return ((aBuf[aIndex] << 16) | (aBuf[aIndex + 1] << 8) |
+ (aBuf[aIndex + 2]));
+ }
+
+ static inline uint32_t
+ ReadLongAt(const uint8_t *aBuf, uint32_t aIndex)
+ {
+ return ((aBuf[aIndex] << 24) | (aBuf[aIndex + 1] << 16) |
+ (aBuf[aIndex + 2] << 8) | (aBuf[aIndex + 3]));
+ }
+
+ static nsresult
+ ReadCMAPTableFormat10(const uint8_t *aBuf, uint32_t aLength,
+ gfxSparseBitSet& aCharacterMap);
+
+ static nsresult
+ ReadCMAPTableFormat12(const uint8_t *aBuf, uint32_t aLength,
+ gfxSparseBitSet& aCharacterMap);
+
+ static nsresult
+ ReadCMAPTableFormat4(const uint8_t *aBuf, uint32_t aLength,
+ gfxSparseBitSet& aCharacterMap);
+
+ static nsresult
+ ReadCMAPTableFormat14(const uint8_t *aBuf, uint32_t aLength,
+ mozilla::UniquePtr<uint8_t[]>& aTable);
+
+ static uint32_t
+ FindPreferredSubtable(const uint8_t *aBuf, uint32_t aBufLength,
+ uint32_t *aTableOffset, uint32_t *aUVSTableOffset,
+ bool *aSymbolEncoding);
+
+ static nsresult
+ ReadCMAP(const uint8_t *aBuf, uint32_t aBufLength,
+ gfxSparseBitSet& aCharacterMap,
+ uint32_t& aUVSOffset,
+ bool& aUnicodeFont, bool& aSymbolFont);
+
+ static uint32_t
+ MapCharToGlyphFormat4(const uint8_t *aBuf, char16_t aCh);
+
+ static uint32_t
+ MapCharToGlyphFormat10(const uint8_t *aBuf, uint32_t aCh);
+
+ static uint32_t
+ MapCharToGlyphFormat12(const uint8_t *aBuf, uint32_t aCh);
+
+ static uint16_t
+ MapUVSToGlyphFormat14(const uint8_t *aBuf, uint32_t aCh, uint32_t aVS);
+
+ // sCJKCompatSVSTable is a 'cmap' format 14 subtable that maps
+ // <char + var-selector> pairs to the corresponding Unicode
+ // compatibility ideograph codepoints.
+ static MOZ_ALWAYS_INLINE uint32_t
+ GetUVSFallback(uint32_t aCh, uint32_t aVS) {
+ aCh = MapUVSToGlyphFormat14(sCJKCompatSVSTable, aCh, aVS);
+ return aCh >= 0xFB00 ? aCh + (0x2F800 - 0xFB00) : aCh;
+ }
+
+ static uint32_t
+ MapCharToGlyph(const uint8_t *aCmapBuf, uint32_t aBufLength,
+ uint32_t aUnicode, uint32_t aVarSelector = 0);
+
+#ifdef XP_WIN
+ // determine whether a font (which has already been sanitized, so is known
+ // to be a valid sfnt) is CFF format rather than TrueType
+ static bool
+ IsCffFont(const uint8_t* aFontData);
+#endif
+
+ // determine the format of font data
+ static gfxUserFontType
+ DetermineFontDataType(const uint8_t *aFontData, uint32_t aFontDataLength);
+
+ // Read the fullname from the sfnt data (used to save the original name
+ // prior to renaming the font for installation).
+ // This is called with sfnt data that has already been validated,
+ // so it should always succeed in finding the name table.
+ static nsresult
+ GetFullNameFromSFNT(const uint8_t* aFontData, uint32_t aLength,
+ nsAString& aFullName);
+
+ // helper to get fullname from name table, constructing from family+style
+ // if no explicit fullname is present
+ static nsresult
+ GetFullNameFromTable(hb_blob_t *aNameTable,
+ nsAString& aFullName);
+
+ // helper to get family name from name table
+ static nsresult
+ GetFamilyNameFromTable(hb_blob_t *aNameTable,
+ nsAString& aFamilyName);
+
+ // Find the table directory entry for a given table tag, in a (validated)
+ // buffer of 'sfnt' data. Returns null if the tag is not present.
+ static mozilla::TableDirEntry*
+ FindTableDirEntry(const void* aFontData, uint32_t aTableTag);
+
+ // Return a blob that wraps a table found within a buffer of font data.
+ // The blob does NOT own its data; caller guarantees that the buffer
+ // will remain valid at least as long as the blob.
+ // Returns null if the specified table is not found.
+ // This method assumes aFontData is valid 'sfnt' data; before using this,
+ // caller is responsible to do any sanitization/validation necessary.
+ static hb_blob_t*
+ GetTableFromFontData(const void* aFontData, uint32_t aTableTag);
+
+ // create a new name table and build a new font with that name table
+ // appended on the end, returns true on success
+ static nsresult
+ RenameFont(const nsAString& aName, const uint8_t *aFontData,
+ uint32_t aFontDataLength, FallibleTArray<uint8_t> *aNewFont);
+
+ // read all names matching aNameID, returning in aNames array
+ static nsresult
+ ReadNames(const char *aNameData, uint32_t aDataLen, uint32_t aNameID,
+ int32_t aPlatformID, nsTArray<nsString>& aNames);
+
+ // reads English or first name matching aNameID, returning in aName
+ // platform based on OS
+ static nsresult
+ ReadCanonicalName(hb_blob_t *aNameTable, uint32_t aNameID,
+ nsString& aName);
+
+ static nsresult
+ ReadCanonicalName(const char *aNameData, uint32_t aDataLen,
+ uint32_t aNameID, nsString& aName);
+
+ // convert a name from the raw name table data into an nsString,
+ // provided we know how; return true if successful, or false
+ // if we can't handle the encoding
+ static bool
+ DecodeFontName(const char *aBuf, int32_t aLength,
+ uint32_t aPlatformCode, uint32_t aScriptCode,
+ uint32_t aLangCode, nsAString& dest);
+
+ static inline bool IsJoinCauser(uint32_t ch) {
+ return (ch == 0x200D);
+ }
+
+ static inline bool IsJoinControl(uint32_t ch) {
+ return (ch == 0x200C || ch == 0x200D);
+ }
+
+ enum {
+ kUnicodeVS1 = 0xFE00,
+ kUnicodeVS16 = 0xFE0F,
+ kUnicodeVS17 = 0xE0100,
+ kUnicodeVS256 = 0xE01EF
+ };
+
+ static inline bool IsVarSelector(uint32_t ch) {
+ return (ch >= kUnicodeVS1 && ch <= kUnicodeVS16) ||
+ (ch >= kUnicodeVS17 && ch <= kUnicodeVS256);
+ }
+
+ enum {
+ kUnicodeRegionalIndicatorA = 0x1F1E6,
+ kUnicodeRegionalIndicatorZ = 0x1F1FF
+ };
+
+ static inline bool IsRegionalIndicator(uint32_t aCh) {
+ return aCh >= kUnicodeRegionalIndicatorA &&
+ aCh <= kUnicodeRegionalIndicatorZ;
+ }
+
+ static inline bool IsInvalid(uint32_t ch) {
+ return (ch == 0xFFFD);
+ }
+
+ // Font code may want to know if there is the potential for bidi behavior
+ // to be triggered by any of the characters in a text run; this can be
+ // used to test that possibility.
+ enum {
+ kUnicodeBidiScriptsStart = 0x0590,
+ kUnicodeBidiScriptsEnd = 0x08FF,
+ kUnicodeBidiPresentationStart = 0xFB1D,
+ kUnicodeBidiPresentationEnd = 0xFEFC,
+ kUnicodeFirstHighSurrogateBlock = 0xD800,
+ kUnicodeRLM = 0x200F,
+ kUnicodeRLE = 0x202B,
+ kUnicodeRLO = 0x202E
+ };
+
+ static inline bool PotentialRTLChar(char16_t aCh) {
+ if (aCh >= kUnicodeBidiScriptsStart && aCh <= kUnicodeBidiScriptsEnd)
+ // bidi scripts Hebrew, Arabic, Syriac, Thaana, N'Ko are all encoded together
+ return true;
+
+ if (aCh == kUnicodeRLM || aCh == kUnicodeRLE || aCh == kUnicodeRLO)
+ // directional controls that trigger bidi layout
+ return true;
+
+ if (aCh >= kUnicodeBidiPresentationStart &&
+ aCh <= kUnicodeBidiPresentationEnd)
+ // presentation forms of Arabic and Hebrew letters
+ return true;
+
+ if ((aCh & 0xFF00) == kUnicodeFirstHighSurrogateBlock)
+ // surrogate that could be part of a bidi supplementary char
+ // (Cypriot, Aramaic, Phoenecian, etc)
+ return true;
+
+ // otherwise we know this char cannot trigger bidi reordering
+ return false;
+ }
+
+ // parse a simple list of font family names into
+ // an array of strings
+ static void ParseFontList(const nsAString& aFamilyList,
+ nsTArray<nsString>& aFontList);
+
+ // for a given font list pref name, append list of font names
+ static void AppendPrefsFontList(const char *aPrefName,
+ nsTArray<nsString>& aFontList);
+
+ // for a given font list pref name, initialize a list of font names
+ static void GetPrefsFontList(const char *aPrefName,
+ nsTArray<nsString>& aFontList);
+
+ // generate a unique font name
+ static nsresult MakeUniqueUserFontName(nsAString& aName);
+
+ // for color layer from glyph using COLR and CPAL tables
+ static bool ValidateColorGlyphs(hb_blob_t* aCOLR, hb_blob_t* aCPAL);
+ static bool GetColorGlyphLayers(hb_blob_t* aCOLR,
+ hb_blob_t* aCPAL,
+ uint32_t aGlyphId,
+ const mozilla::gfx::Color& aDefaultColor,
+ nsTArray<uint16_t> &aGlyphs,
+ nsTArray<mozilla::gfx::Color> &aColors);
+
+protected:
+ friend struct MacCharsetMappingComparator;
+
+ static nsresult
+ ReadNames(const char *aNameData, uint32_t aDataLen, uint32_t aNameID,
+ int32_t aLangID, int32_t aPlatformID, nsTArray<nsString>& aNames);
+
+ // convert opentype name-table platform/encoding/language values to a charset name
+ // we can use to convert the name data to unicode, or "" if data is UTF16BE
+ static const char*
+ GetCharsetForFontName(uint16_t aPlatform, uint16_t aScript, uint16_t aLanguage);
+
+ struct MacFontNameCharsetMapping {
+ uint16_t mEncoding;
+ uint16_t mLanguage;
+ const char *mCharsetName;
+
+ bool operator<(const MacFontNameCharsetMapping& rhs) const {
+ return (mEncoding < rhs.mEncoding) ||
+ ((mEncoding == rhs.mEncoding) && (mLanguage < rhs.mLanguage));
+ }
+ };
+ static const MacFontNameCharsetMapping gMacFontNameCharsets[];
+ static const char* gISOFontNameCharsets[];
+ static const char* gMSFontNameCharsets[];
+};
+
+#endif /* GFX_FONT_UTILS_H */
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-25 16:58:14 +0000