/** Return the number of tables, or if this is a TTC (collection), return the
number of tables in the first element of the collection. In either case,
if offsetToDir is not-null, set it to the offset to the beginning of the
table headers (SkSFNTDirEntry), relative to the start of the stream.
On an error, return 0 for number of tables, and ignore offsetToDir
*/
static int count_tables(SkStream* stream, size_t* offsetToDir = NULL) {
SkSharedTTHeader shared;
if (stream->read(&shared, sizeof(shared)) != sizeof(shared)) {
return 0;
}
// by default, SkSFNTHeader is at the start of the stream
size_t offset = 0;
// if we're really a collection, the first 4-bytes will be 'ttcf'
uint32_t tag = SkEndian_SwapBE32(shared.fCollection.fTag);
if (SkSetFourByteTag('t', 't', 'c', 'f') == tag) {
if (shared.fCollection.fNumOffsets == 0) {
return 0;
}
// this is the offset to the first local SkSFNTHeader
offset = SkEndian_SwapBE32(shared.fCollection.fOffset0);
stream->rewind();
if (stream->skip(offset) != offset) {
return 0;
}
if (stream->read(&shared, sizeof(shared)) != sizeof(shared)) {
return 0;
}
}
if (offsetToDir) {
// add the size of the header, so we will point to the DirEntries
*offsetToDir = offset + sizeof(SkSFNTHeader);
}
return SkEndian_SwapBE16(shared.fSingle.fNumTables);
}
bool valid() const {
return_if_false(fSize >= kICCHeaderSize, "Size is too small");
uint8_t majorVersion = fVersion >> 24;
return_if_false(majorVersion <= 4, "Unsupported version");
// These are the three basic classes of profiles that we might expect to see embedded
// in images. Four additional classes exist, but they generally are used as a convenient
// way for CMMs to store calculated transforms.
const uint32_t kDisplay_Profile = SkSetFourByteTag('m', 'n', 't', 'r');
const uint32_t kInput_Profile = SkSetFourByteTag('s', 'c', 'n', 'r');
const uint32_t kOutput_Profile = SkSetFourByteTag('p', 'r', 't', 'r');
return_if_false(fProfileClass == kDisplay_Profile ||
fProfileClass == kInput_Profile ||
fProfileClass == kOutput_Profile,
"Unsupported profile");
// TODO (msarett):
// All the profiles we've tested so far use RGB as the input color space.
return_if_false(fInputColorSpace == kRGB_ColorSpace, "Unsupported color space");
// TODO (msarett):
// All the profiles we've tested so far use XYZ as the profile connection space.
const uint32_t kXYZ_PCSSpace = SkSetFourByteTag('X', 'Y', 'Z', ' ');
return_if_false(fPCS == kXYZ_PCSSpace, "Unsupported PCS space");
return_if_false(fSignature == SkSetFourByteTag('a', 'c', 's', 'p'), "Bad signature");
// TODO (msarett):
// Should we treat different rendering intents differently?
// Valid rendering intents include kPerceptual (0), kRelative (1),
// kSaturation (2), and kAbsolute (3).
return_if_false(fRenderingIntent <= 3, "Bad rendering intent");
return_if_false(color_space_almost_equal(SkFixedToFloat(fIlluminantXYZ[0]), 0.96420f) &&
color_space_almost_equal(SkFixedToFloat(fIlluminantXYZ[1]), 1.00000f) &&
color_space_almost_equal(SkFixedToFloat(fIlluminantXYZ[2]), 0.82491f),
"Illuminant must be D50");
return_if_false(fTagCount <= 100, "Too many tags");
return true;
}
bool valid() const {
// TODO (msarett):
// For now it's nice to fail loudly on invalid inputs. But, can we
// recover from some of these errors?
return_if_false(fSize >= kICCHeaderSize, "Size is too small");
uint8_t majorVersion = fVersion >> 24;
return_if_false(majorVersion <= 4, "Unsupported version");
const uint32_t kDisplay_Profile = SkSetFourByteTag('m', 'n', 't', 'r');
const uint32_t kInput_Profile = SkSetFourByteTag('s', 'c', 'n', 'r');
const uint32_t kOutput_Profile = SkSetFourByteTag('p', 'r', 't', 'r');
// TODO (msarett):
// Should we also support DeviceLink, ColorSpace, Abstract, or NamedColor?
return_if_false(fClassProfile == kDisplay_Profile ||
fClassProfile == kInput_Profile ||
fClassProfile == kOutput_Profile,
"Unsupported class profile");
// TODO (msarett):
// There are many more color spaces that we could try to support.
return_if_false(fColorSpace == kRGB_ColorSpace || fColorSpace == kGray_ColorSpace,
"Unsupported color space");
const uint32_t kXYZ_PCSSpace = SkSetFourByteTag('X', 'Y', 'Z', ' ');
// TODO (msarett):
// Can we support PCS LAB as well?
return_if_false(fPCS == kXYZ_PCSSpace, "Unsupported PCS space");
return_if_false(fSignature == SkSetFourByteTag('a', 'c', 's', 'p'), "Bad signature");
// TODO (msarett):
// Should we treat different rendering intents differently?
// Valid rendering intents include kPerceptual (0), kRelative (1),
// kSaturation (2), and kAbsolute (3).
return_if_false(fRenderingIntent <= 3, "Bad rendering intent");
return_if_false(fTagCount <= 100, "Too many tags");
return true;
}
int SkFontStream::CountTTCEntries(SkStream* stream) {
stream->rewind();
SkSharedTTHeader shared;
if (!read(stream, &shared, sizeof(shared))) {
return 0;
}
// if we're really a collection, the first 4-bytes will be 'ttcf'
uint32_t tag = SkEndian_SwapBE32(shared.fCollection.fTag);
if (SkSetFourByteTag('t', 't', 'c', 'f') == tag) {
return SkEndian_SwapBE32(shared.fCollection.fNumOffsets);
} else {
return 1; // normal 'sfnt' has 1 dir entry
}
}
void onDraw(SkCanvas* canvas) override {
SkPaint paint;
paint.setAntiAlias(true);
paint.setLCDRenderText(true);
SkAutoTUnref<SkFontMgr> fontMgr(SkFontMgr::RefDefault());
SkAutoTDelete<SkStreamAsset> distortable(GetResourceAsStream("/fonts/Distortable.ttf"));
if (!distortable) {
return;
}
const char* text = "abc";
const size_t textLen = strlen(text);
for (int j = 0; j < 2; ++j) {
for (int i = 0; i < 5; ++i) {
SkScalar x = SkIntToScalar(10);
SkScalar y = SkIntToScalar(20);
SkFourByteTag tag = SkSetFourByteTag('w','g','h','t');
SkScalar styleValue = SkDoubleToScalar(0.5 + (5*j + i) * ((2.0 - 0.5) / (2 * 5)));
SkFontMgr::FontParameters::Axis axes[] = { { tag, styleValue } };
paint.setTypeface(sk_sp<SkTypeface>(fontMgr->createFromStream(
distortable->duplicate(), SkFontMgr::FontParameters().setAxes(axes, 1))));
SkAutoCanvasRestore acr(canvas, true);
canvas->translate(SkIntToScalar(30 + i * 100), SkIntToScalar(20));
rotate_about(canvas, SkIntToScalar(i * 5), x, y * 10);
{
SkPaint p;
p.setAntiAlias(true);
SkRect r;
r.set(x - SkIntToScalar(3), SkIntToScalar(15),
x - SkIntToScalar(1), SkIntToScalar(280));
canvas->drawRect(r, p);
}
for (int ps = 6; ps <= 22; ps++) {
paint.setTextSize(SkIntToScalar(ps));
canvas->drawText(text, textLen, x, y, paint);
y += paint.getFontMetrics(nullptr);
}
}
canvas->translate(0, SkIntToScalar(360));
paint.setSubpixelText(true);
}
}
/** Return the number of tables, or if this is a TTC (collection), return the
number of tables in the first element of the collection. In either case,
if offsetToDir is not-null, set it to the offset to the beginning of the
table headers (SkSFNTDirEntry), relative to the start of the stream.
On an error, return 0 for number of tables, and ignore offsetToDir
*/
static int count_tables(SkStream* stream, int ttcIndex, size_t* offsetToDir) {
SkASSERT(ttcIndex >= 0);
SkAutoSMalloc<1024> storage(sizeof(SkSharedTTHeader));
SkSharedTTHeader* header = (SkSharedTTHeader*)storage.get();
if (!read(stream, header, sizeof(SkSharedTTHeader))) {
return 0;
}
// by default, SkSFNTHeader is at the start of the stream
size_t offset = 0;
// if we're really a collection, the first 4-bytes will be 'ttcf'
uint32_t tag = SkEndian_SwapBE32(header->fCollection.fTag);
if (SkSetFourByteTag('t', 't', 'c', 'f') == tag) {
unsigned count = SkEndian_SwapBE32(header->fCollection.fNumOffsets);
if ((unsigned)ttcIndex >= count) {
return 0;
}
if (ttcIndex > 0) { // need to read more of the shared header
stream->rewind();
size_t amount = sizeof(SkSharedTTHeader) + ttcIndex * sizeof(uint32_t);
header = (SkSharedTTHeader*)storage.reset(amount);
if (!read(stream, header, amount)) {
return 0;
}
}
// this is the offset to the local SkSFNTHeader
offset = SkEndian_SwapBE32((&header->fCollection.fOffset0)[ttcIndex]);
stream->rewind();
if (!skip(stream, offset)) {
return 0;
}
if (!read(stream, header, sizeof(SkSFNTHeader))) {
return 0;
}
}
if (offsetToDir) {
// add the size of the header, so we will point to the DirEntries
*offsetToDir = offset + sizeof(SkSFNTHeader);
}
return SkEndian_SwapBE16(header->fSingle.fNumTables);
}
SkOTUtils::LocalizedStrings_NameTable*
SkOTUtils::LocalizedStrings_NameTable::CreateForFamilyNames(const SkTypeface& typeface) {
static const SkFontTableTag nameTag = SkSetFourByteTag('n','a','m','e');
size_t nameTableSize = typeface.getTableSize(nameTag);
if (0 == nameTableSize) {
return NULL;
}
SkAutoTDeleteArray<uint8_t> nameTableData(new uint8_t[nameTableSize]);
size_t copied = typeface.getTableData(nameTag, 0, nameTableSize, nameTableData.get());
if (copied != nameTableSize) {
return NULL;
}
return new SkOTUtils::LocalizedStrings_NameTable((SkOTTableName*)nameTableData.detach(),
SkOTUtils::LocalizedStrings_NameTable::familyNameTypes,
SK_ARRAY_COUNT(SkOTUtils::LocalizedStrings_NameTable::familyNameTypes));
}
void SimpleFontData::platformInit(bool subpixelAscentDescent) {
if (!m_platformData.size()) {
m_fontMetrics.reset();
m_avgCharWidth = 0;
m_maxCharWidth = 0;
return;
}
SkPaint::FontMetrics metrics;
m_platformData.setupPaint(&m_paint);
m_paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
m_paint.getFontMetrics(&metrics);
SkTypeface* face = m_paint.getTypeface();
ASSERT(face);
int vdmxAscent = 0, vdmxDescent = 0;
bool isVDMXValid = false;
#if OS(LINUX) || OS(ANDROID)
// Manually digging up VDMX metrics is only applicable when bytecode hinting
// using FreeType. With DirectWrite or CoreText, no bytecode hinting is ever
// done. This code should be pushed into FreeType (hinted font metrics).
static const uint32_t vdmxTag = SkSetFourByteTag('V', 'D', 'M', 'X');
int pixelSize = m_platformData.size() + 0.5;
if (!m_paint.isAutohinted() &&
(m_paint.getHinting() == SkPaint::kFull_Hinting ||
m_paint.getHinting() == SkPaint::kNormal_Hinting)) {
size_t vdmxSize = face->getTableSize(vdmxTag);
if (vdmxSize && vdmxSize < maxVDMXTableSize) {
uint8_t* vdmxTable = (uint8_t*)WTF::Partitions::fastMalloc(
vdmxSize, WTF_HEAP_PROFILER_TYPE_NAME(SimpleFontData));
if (vdmxTable &&
face->getTableData(vdmxTag, 0, vdmxSize, vdmxTable) == vdmxSize &&
parseVDMX(&vdmxAscent, &vdmxDescent, vdmxTable, vdmxSize, pixelSize))
isVDMXValid = true;
WTF::Partitions::fastFree(vdmxTable);
}
}
#endif
float ascent;
float descent;
// Beware those who step here: This code is designed to match Win32 font
// metrics *exactly* except:
// - the adjustment of ascent/descent on Linux/Android
// - metrics.fAscent and .fDesscent are not rounded to int for tiny fonts
if (isVDMXValid) {
ascent = vdmxAscent;
descent = -vdmxDescent;
} else {
// For tiny fonts, the rounding of fAscent and fDescent results in equal
// baseline for different types of text baselines (crbug.com/338908).
// Please see CanvasRenderingContext2D::getFontBaseline for the heuristic.
if (subpixelAscentDescent &&
(-metrics.fAscent < 3 || -metrics.fAscent + metrics.fDescent < 2)) {
ascent = -metrics.fAscent;
descent = metrics.fDescent;
} else {
ascent = SkScalarRoundToScalar(-metrics.fAscent);
descent = SkScalarRoundToScalar(metrics.fDescent);
}
#if OS(LINUX) || OS(ANDROID)
// When subpixel positioning is enabled, if the descent is rounded down, the
// descent part of the glyph may be truncated when displayed in a 'overflow:
// hidden' container. To avoid that, borrow 1 unit from the ascent when
// possible.
// FIXME: This can be removed if sub-pixel ascent/descent is supported.
if (platformData().getFontRenderStyle().useSubpixelPositioning &&
descent < SkScalarToFloat(metrics.fDescent) && ascent >= 1) {
++descent;
--ascent;
}
#endif
}
#if OS(MACOSX)
// We are preserving this ascent hack to match Safari's ascent adjustment
// in their SimpleFontDataMac.mm, for details see crbug.com/445830.
// We need to adjust Times, Helvetica, and Courier to closely match the
// vertical metrics of their Microsoft counterparts that are the de facto
// web standard. The AppKit adjustment of 20% is too big and is
// incorrectly added to line spacing, so we use a 15% adjustment instead
// and add it to the ascent.
DEFINE_STATIC_LOCAL(AtomicString, timesName, ("Times"));
DEFINE_STATIC_LOCAL(AtomicString, helveticaName, ("Helvetica"));
DEFINE_STATIC_LOCAL(AtomicString, courierName, ("Courier"));
String familyName = m_platformData.fontFamilyName();
if (familyName == timesName || familyName == helveticaName ||
familyName == courierName)
ascent += floorf(((ascent + descent) * 0.15f) + 0.5f);
#endif
m_fontMetrics.setAscent(ascent);
m_fontMetrics.setDescent(descent);
float xHeight;
if (metrics.fXHeight) {
xHeight = metrics.fXHeight;
#if OS(MACOSX)
// Mac OS CTFontGetXHeight reports the bounding box height of x,
// including parts extending below the baseline and apparently no x-height
// value from the OS/2 table. However, the CSS ex unit
// expects only parts above the baseline, hence measuring the glyph:
// http://www.w3.org/TR/css3-values/#ex-unit
const Glyph xGlyph = glyphForCharacter('x');
if (xGlyph) {
FloatRect glyphBounds(boundsForGlyph(xGlyph));
// SkGlyph bounds, y down, based on rendering at (0,0).
xHeight = -glyphBounds.y();
}
#endif
m_fontMetrics.setXHeight(xHeight);
} else {
xHeight = ascent * 0.56; // Best guess from Windows font metrics.
m_fontMetrics.setXHeight(xHeight);
m_fontMetrics.setHasXHeight(false);
}
float lineGap = SkScalarToFloat(metrics.fLeading);
m_fontMetrics.setLineGap(lineGap);
m_fontMetrics.setLineSpacing(lroundf(ascent) + lroundf(descent) +
lroundf(lineGap));
if (platformData().isVerticalAnyUpright() && !isTextOrientationFallback()) {
static const uint32_t vheaTag = SkSetFourByteTag('v', 'h', 'e', 'a');
static const uint32_t vorgTag = SkSetFourByteTag('V', 'O', 'R', 'G');
size_t vheaSize = face->getTableSize(vheaTag);
size_t vorgSize = face->getTableSize(vorgTag);
if ((vheaSize > 0) || (vorgSize > 0))
m_hasVerticalGlyphs = true;
}
// In WebKit/WebCore/platform/graphics/SimpleFontData.cpp, m_spaceWidth is
// calculated for us, but we need to calculate m_maxCharWidth and
// m_avgCharWidth in order for text entry widgets to be sized correctly.
#if OS(WIN)
m_maxCharWidth = SkScalarRoundToInt(metrics.fMaxCharWidth);
// Older version of the DirectWrite API doesn't implement support for max
// char width. Fall back on a multiple of the ascent. This is entirely
// arbitrary but comes pretty close to the expected value in most cases.
if (m_maxCharWidth < 1)
m_maxCharWidth = ascent * 2;
#elif OS(MACOSX)
// FIXME: The current avg/max character width calculation is not ideal,
// it should check either the OS2 table or, better yet, query FontMetrics.
// Sadly FontMetrics provides incorrect data on Mac at the moment.
// https://crbug.com/420901
m_maxCharWidth = std::max(m_avgCharWidth, m_fontMetrics.floatAscent());
#else
// Better would be to rely on either fMaxCharWidth or fAveCharWidth.
// skbug.com/3087
m_maxCharWidth = SkScalarRoundToInt(metrics.fXMax - metrics.fXMin);
#endif
#if !OS(MACOSX)
if (metrics.fAvgCharWidth) {
m_avgCharWidth = SkScalarRoundToInt(metrics.fAvgCharWidth);
} else {
#endif
m_avgCharWidth = xHeight;
const Glyph xGlyph = glyphForCharacter('x');
if (xGlyph) {
m_avgCharWidth = widthForGlyph(xGlyph);
}
#if !OS(MACOSX)
}
#endif
if (int unitsPerEm = face->getUnitsPerEm())
m_fontMetrics.setUnitsPerEm(unitsPerEm);
}
void SimpleFontData::platformInit()
{
if (!m_platformData.size()) {
m_fontMetrics.reset();
m_avgCharWidth = 0;
m_maxCharWidth = 0;
return;
}
SkPaint paint;
SkPaint::FontMetrics metrics;
m_platformData.setupPaint(&paint);
paint.getFontMetrics(&metrics);
const SkFontID fontID = m_platformData.uniqueID();
static const uint32_t vdmxTag = SkSetFourByteTag('V', 'D', 'M', 'X');
int pixelSize = m_platformData.size() + 0.5;
int vdmxAscent, vdmxDescent;
bool isVDMXValid = false;
size_t vdmxSize = SkFontHost::GetTableSize(fontID, vdmxTag);
if (vdmxSize && vdmxSize < maxVDMXTableSize) {
uint8_t* vdmxTable = (uint8_t*) fastMalloc(vdmxSize);
if (vdmxTable
&& SkFontHost::GetTableData(fontID, vdmxTag, 0, vdmxSize, vdmxTable) == vdmxSize
&& parseVDMX(&vdmxAscent, &vdmxDescent, vdmxTable, vdmxSize, pixelSize))
isVDMXValid = true;
fastFree(vdmxTable);
}
float ascent;
float descent;
// Beware those who step here: This code is designed to match Win32 font
// metrics *exactly*.
if (isVDMXValid) {
ascent = vdmxAscent;
descent = -vdmxDescent;
} else {
SkScalar height = -metrics.fAscent + metrics.fDescent + metrics.fLeading;
ascent = SkScalarRound(-metrics.fAscent);
descent = SkScalarRound(height) - ascent;
}
m_fontMetrics.setAscent(ascent);
m_fontMetrics.setDescent(descent);
float xHeight;
if (metrics.fXHeight)
xHeight = metrics.fXHeight;
else {
// hack taken from the Windows port
xHeight = ascent * 0.56f;
}
float lineGap = SkScalarToFloat(metrics.fLeading);
m_fontMetrics.setLineGap(lineGap);
m_fontMetrics.setXHeight(xHeight);
m_fontMetrics.setLineSpacing(lroundf(ascent) + lroundf(descent) + lroundf(lineGap));
if (platformData().orientation() == Vertical && !isTextOrientationFallback()) {
static const uint32_t vheaTag = SkSetFourByteTag('v', 'h', 'e', 'a');
static const uint32_t vorgTag = SkSetFourByteTag('V', 'O', 'R', 'G');
size_t vheaSize = SkFontHost::GetTableSize(fontID, vheaTag);
size_t vorgSize = SkFontHost::GetTableSize(fontID, vorgTag);
if ((vheaSize > 0) || (vorgSize > 0))
m_hasVerticalGlyphs = true;
}
// In WebKit/WebCore/platform/graphics/SimpleFontData.cpp, m_spaceWidth is
// calculated for us, but we need to calculate m_maxCharWidth and
// m_avgCharWidth in order for text entry widgets to be sized correctly.
SkScalar xRange = metrics.fXMax - metrics.fXMin;
m_maxCharWidth = SkScalarRound(xRange * SkScalarRound(m_platformData.size()));
if (metrics.fAvgCharWidth)
m_avgCharWidth = SkScalarRound(metrics.fAvgCharWidth);
else {
m_avgCharWidth = xHeight;
GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
if (glyphPageZero) {
static const UChar32 x_char = 'x';
const Glyph xGlyph = glyphPageZero->glyphDataForCharacter(x_char).glyph;
if (xGlyph)
m_avgCharWidth = widthForGlyph(xGlyph);
}
}
}
void SimpleFontData::platformInit() {
if (!m_platformData.size()) {
m_fontMetrics.reset();
m_avgCharWidth = 0;
m_maxCharWidth = 0;
return;
}
SkPaint paint;
SkPaint::FontMetrics metrics;
m_platformData.setupPaint(&paint);
paint.getFontMetrics(&metrics);
SkTypeface* face = paint.getTypeface();
ASSERT(face);
int vdmxAscent = 0, vdmxDescent = 0;
bool isVDMXValid = false;
#if OS(LINUX) || OS(ANDROID)
// Manually digging up VDMX metrics is only applicable when bytecode hinting
// using FreeType. With GDI, the metrics will already have taken this into
// account (as needed). With DirectWrite or CoreText, no bytecode hinting is
// ever done. This code should be pushed into FreeType (hinted font metrics).
static const uint32_t vdmxTag = SkSetFourByteTag('V', 'D', 'M', 'X');
int pixelSize = m_platformData.size() + 0.5;
if (!paint.isAutohinted() &&
(paint.getHinting() == SkPaint::kFull_Hinting ||
paint.getHinting() == SkPaint::kNormal_Hinting)) {
size_t vdmxSize = face->getTableSize(vdmxTag);
if (vdmxSize && vdmxSize < maxVDMXTableSize) {
uint8_t* vdmxTable = (uint8_t*)fastMalloc(vdmxSize);
if (vdmxTable &&
face->getTableData(vdmxTag, 0, vdmxSize, vdmxTable) == vdmxSize &&
parseVDMX(&vdmxAscent, &vdmxDescent, vdmxTable, vdmxSize, pixelSize))
isVDMXValid = true;
fastFree(vdmxTable);
}
}
#endif
float ascent;
float descent;
// Beware those who step here: This code is designed to match Win32 font
// metrics *exactly* (except the adjustment of ascent/descent on
// Linux/Android).
if (isVDMXValid) {
ascent = vdmxAscent;
descent = -vdmxDescent;
} else {
ascent = SkScalarRoundToInt(-metrics.fAscent);
descent = SkScalarRoundToInt(metrics.fDescent);
#if OS(LINUX) || OS(ANDROID)
// When subpixel positioning is enabled, if the descent is rounded down, the
// descent part of the glyph may be truncated when displayed in a 'overflow:
// hidden' container. To avoid that, borrow 1 unit from the ascent when
// possible.
// FIXME: This can be removed if sub-pixel ascent/descent is supported.
if (platformData().fontRenderStyle().useSubpixelPositioning &&
descent < SkScalarToFloat(metrics.fDescent) && ascent >= 1) {
++descent;
--ascent;
}
#endif
}
m_fontMetrics.setAscent(ascent);
m_fontMetrics.setDescent(descent);
float xHeight;
if (metrics.fXHeight) {
xHeight = metrics.fXHeight;
m_fontMetrics.setXHeight(xHeight);
} else {
xHeight = ascent * 0.56; // Best guess from Windows font metrics.
m_fontMetrics.setXHeight(xHeight);
m_fontMetrics.setHasXHeight(false);
}
float lineGap = SkScalarToFloat(metrics.fLeading);
m_fontMetrics.setLineGap(lineGap);
m_fontMetrics.setLineSpacing(lroundf(ascent) + lroundf(descent) +
lroundf(lineGap));
SkScalar underlineThickness, underlinePosition;
if (metrics.hasUnderlineThickness(&underlineThickness) &&
metrics.hasUnderlinePosition(&underlinePosition)) {
m_fontMetrics.setUnderlineThickness(SkScalarToFloat(underlineThickness));
m_fontMetrics.setUnderlinePosition(SkScalarToFloat(-underlinePosition));
}
if (platformData().orientation() == Vertical &&
!isTextOrientationFallback()) {
static const uint32_t vheaTag = SkSetFourByteTag('v', 'h', 'e', 'a');
static const uint32_t vorgTag = SkSetFourByteTag('V', 'O', 'R', 'G');
size_t vheaSize = face->getTableSize(vheaTag);
size_t vorgSize = face->getTableSize(vorgTag);
if ((vheaSize > 0) || (vorgSize > 0))
m_hasVerticalGlyphs = true;
}
// In WebKit/WebCore/platform/graphics/SimpleFontData.cpp, m_spaceWidth is
// calculated for us, but we need to calculate m_maxCharWidth and
// m_avgCharWidth in order for text entry widgets to be sized correctly.
// FIXME: This seems incorrect and should probably use fMaxCharWidth as
// the code path above.
SkScalar xRange = metrics.fXMax - metrics.fXMin;
m_maxCharWidth =
SkScalarRoundToInt(xRange * SkScalarRoundToInt(m_platformData.size()));
if (metrics.fAvgCharWidth)
m_avgCharWidth = SkScalarRoundToInt(metrics.fAvgCharWidth);
else {
m_avgCharWidth = xHeight;
GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
if (glyphPageZero) {
static const UChar32 xChar = 'x';
const Glyph xGlyph = glyphPageZero->glyphForCharacter(xChar);
if (xGlyph) {
// In widthForGlyph(), xGlyph will be compared with
// m_zeroWidthSpaceGlyph, which isn't initialized yet here.
// Initialize it with zero to make sure widthForGlyph() returns
// the right width.
m_zeroWidthSpaceGlyph = 0;
m_avgCharWidth = widthForGlyph(xGlyph);
}
}
}
if (int unitsPerEm = face->getUnitsPerEm())
m_fontMetrics.setUnitsPerEm(unitsPerEm);
}
static void test_systemfonts(skiatest::Reporter* reporter, bool verbose) {
static const SkFontTableTag nameTag = SkSetFourByteTag('n','a','m','e');
sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault());
int count = SkMin32(fm->countFamilies(), MAX_FAMILIES);
for (int i = 0; i < count; ++i) {
sk_sp<SkFontStyleSet> set(fm->createStyleSet(i));
for (int j = 0; j < set->count(); ++j) {
SkString sname;
SkFontStyle fs;
set->getStyle(j, &fs, &sname);
sk_sp<SkTypeface> typeface(set->createTypeface(j));
SkString familyName;
typeface->getFamilyName(&familyName);
if (verbose) {
SkDebugf("[%s]\n", familyName.c_str());
}
sk_sp<SkTypeface::LocalizedStrings> familyNamesIter(
typeface->createFamilyNameIterator());
SkTypeface::LocalizedString familyNameLocalized;
while (familyNamesIter->next(&familyNameLocalized)) {
if (verbose) {
SkDebugf("(%s) <%s>\n", familyNameLocalized.fString.c_str(),
familyNameLocalized.fLanguage.c_str());
}
}
size_t nameTableSize = typeface->getTableSize(nameTag);
if (0 == nameTableSize) {
continue;
}
SkAutoTMalloc<uint8_t> nameTableData(nameTableSize);
size_t copied = typeface->getTableData(nameTag, 0, nameTableSize, nameTableData.get());
if (copied != nameTableSize) {
continue;
}
SkOTTableName::Iterator::Record record;
SkOTTableName::Iterator familyNameIter(*((SkOTTableName*)nameTableData.get()),
SkOTTableName::Record::NameID::Predefined::FontFamilyName);
while (familyNameIter.next(record)) {
REPORTER_ASSERT_MESSAGE(reporter,
SkOTTableName::Record::NameID::Predefined::FontFamilyName == record.type,
"Requested family name, got something else."
);
if (verbose) {
SkDebugf("{%s} <%s>\n", record.name.c_str(), record.language.c_str());
}
}
SkOTTableName::Iterator styleNameIter(*((SkOTTableName*)nameTableData.get()),
SkOTTableName::Record::NameID::Predefined::FontSubfamilyName);
while (styleNameIter.next(record)) {
REPORTER_ASSERT_MESSAGE(reporter,
SkOTTableName::Record::NameID::Predefined::FontSubfamilyName == record.type,
"Requested subfamily name, got something else."
);
if (verbose) {
SkDebugf("{{%s}} <%s>\n", record.name.c_str(), record.language.c_str());
}
}
if (verbose) {
SkDebugf("\n");
}
}
}
}
/**
* Use this for bitmapcache and mipmapcache entries.
*/
uint64_t SkMakeResourceCacheSharedIDForBitmap(uint32_t bitmapGenID) {
uint64_t sharedID = SkSetFourByteTag('b', 'm', 'a', 'p');
return (sharedID << 32) | bitmapGenID;
}
return ptr[0] << 24 | ptr[1] << 16 | ptr[2] << 8 | ptr[3];
}
static int32_t read_big_endian_int(const uint8_t* ptr) {
return (int32_t) read_big_endian_uint(ptr);
}
// This is equal to the header size according to the ICC specification (128)
// plus the size of the tag count (4). We include the tag count since we
// always require it to be present anyway.
static const size_t kICCHeaderSize = 132;
// Contains a signature (4), offset (4), and size (4).
static const size_t kICCTagTableEntrySize = 12;
static const uint32_t kRGB_ColorSpace = SkSetFourByteTag('R', 'G', 'B', ' ');
struct ICCProfileHeader {
uint32_t fSize;
// No reason to care about the preferred color management module (ex: Adobe, Apple, etc.).
// We're always going to use this one.
uint32_t fCMMType_ignored;
uint32_t fVersion;
uint32_t fProfileClass;
uint32_t fInputColorSpace;
uint32_t fPCS;
uint32_t fDateTime_ignored[3];
uint32_t fSignature;
void SimpleFontData::platformInit()
{
if (!m_platformData.size()) {
m_fontMetrics.reset();
m_avgCharWidth = 0;
m_maxCharWidth = 0;
return;
}
SkPaint paint;
SkPaint::FontMetrics metrics;
m_platformData.setupPaint(&paint);
paint.getFontMetrics(&metrics);
const SkFontID fontID = m_platformData.uniqueID();
static const uint32_t vdmxTag = SkSetFourByteTag('V', 'D', 'M', 'X');
int pixelSize = m_platformData.size() + 0.5;
int vdmxAscent, vdmxDescent;
bool isVDMXValid = false;
size_t vdmxSize = SkFontHost::GetTableSize(fontID, vdmxTag);
if (vdmxSize && vdmxSize < maxVDMXTableSize) {
uint8_t* vdmxTable = (uint8_t*) fastMalloc(vdmxSize);
if (vdmxTable
&& SkFontHost::GetTableData(fontID, vdmxTag, 0, vdmxSize, vdmxTable) == vdmxSize
&& parseVDMX(&vdmxAscent, &vdmxDescent, vdmxTable, vdmxSize, pixelSize))
isVDMXValid = true;
fastFree(vdmxTable);
}
float ascent;
float descent;
// Beware those who step here: This code is designed to match Win32 font
// metrics *exactly* (except the adjustment of ascent/descent on Linux/Android).
if (isVDMXValid) {
ascent = vdmxAscent;
descent = -vdmxDescent;
} else {
SkScalar height = -metrics.fAscent + metrics.fDescent + metrics.fLeading;
ascent = SkScalarRound(-metrics.fAscent);
descent = SkScalarRound(height) - ascent;
#if OS(LINUX) || OS(ANDROID)
// When subpixel positioning is enabled, if the descent is rounded down, the descent part
// of the glyph may be truncated when displayed in a 'overflow: hidden' container.
// To avoid that, borrow 1 unit from the ascent when possible.
// FIXME: This can be removed if sub-pixel ascent/descent is supported.
if (platformData().fontRenderStyle().useSubpixelPositioning && descent < SkScalarToFloat(metrics.fDescent) && ascent >= 1) {
++descent;
--ascent;
}
#endif
}
m_fontMetrics.setAscent(ascent);
m_fontMetrics.setDescent(descent);
float xHeight;
if (metrics.fXHeight) {
xHeight = metrics.fXHeight;
m_fontMetrics.setXHeight(xHeight);
} else {
xHeight = ascent * 0.56; // Best guess from Windows font metrics.
m_fontMetrics.setXHeight(xHeight);
m_fontMetrics.setHasXHeight(false);
}
float lineGap = SkScalarToFloat(metrics.fLeading);
m_fontMetrics.setLineGap(lineGap);
m_fontMetrics.setLineSpacing(lroundf(ascent) + lroundf(descent) + lroundf(lineGap));
if (platformData().orientation() == Vertical && !isTextOrientationFallback()) {
static const uint32_t vheaTag = SkSetFourByteTag('v', 'h', 'e', 'a');
static const uint32_t vorgTag = SkSetFourByteTag('V', 'O', 'R', 'G');
size_t vheaSize = SkFontHost::GetTableSize(fontID, vheaTag);
size_t vorgSize = SkFontHost::GetTableSize(fontID, vorgTag);
if ((vheaSize > 0) || (vorgSize > 0))
m_hasVerticalGlyphs = true;
}
// In WebKit/WebCore/platform/graphics/SimpleFontData.cpp, m_spaceWidth is
// calculated for us, but we need to calculate m_maxCharWidth and
// m_avgCharWidth in order for text entry widgets to be sized correctly.
SkScalar xRange = metrics.fXMax - metrics.fXMin;
m_maxCharWidth = SkScalarRound(xRange * SkScalarRound(m_platformData.size()));
if (metrics.fAvgCharWidth)
m_avgCharWidth = SkScalarRound(metrics.fAvgCharWidth);
else {
m_avgCharWidth = xHeight;
GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
if (glyphPageZero) {
static const UChar32 xChar = 'x';
const Glyph xGlyph = glyphPageZero->glyphDataForCharacter(xChar).glyph;
if (xGlyph) {
// In widthForGlyph(), xGlyph will be compared with
// m_zeroWidthSpaceGlyph, which isn't initialized yet here.
// Initialize it with zero to make sure widthForGlyph() returns
// the right width.
m_zeroWidthSpaceGlyph = 0;
m_avgCharWidth = widthForGlyph(xGlyph);
}
}
}
if (int unitsPerEm = paint.getTypeface()->getUnitsPerEm())
m_fontMetrics.setUnitsPerEm(unitsPerEm);
}
