float Font::width(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
{
CodePath codePathToUse = codePath(run);
if (codePathToUse != Complex) {
// The complex path is more restrictive about returning fallback fonts than the simple path, so we need an explicit test to make their behaviors match.
if (!canReturnFallbackFontsForComplexText())
fallbackFonts = 0;
// The simple path can optimize the case where glyph overflow is not observable.
if (codePathToUse != SimpleWithGlyphOverflow && (glyphOverflow && !glyphOverflow->computeBounds))
glyphOverflow = 0;
}
bool hasKerningOrLigatures = typesettingFeatures() & (Kerning | Ligatures);
bool hasWordSpacingOrLetterSpacing = wordSpacing() | letterSpacing();
float* cacheEntry = m_fontFallbackList->widthCache().add(run, std::numeric_limits<float>::quiet_NaN(), hasKerningOrLigatures, hasWordSpacingOrLetterSpacing, glyphOverflow);
if (cacheEntry && !std::isnan(*cacheEntry))
return *cacheEntry;
float result;
if (codePathToUse == Complex)
result = floatWidthForComplexText(run, fallbackFonts, glyphOverflow);
else
result = floatWidthForSimpleText(run, fallbackFonts, glyphOverflow);
if (cacheEntry && (!fallbackFonts || fallbackFonts->isEmpty()))
*cacheEntry = result;
return result;
}
float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* /* fallbackFonts */, GlyphOverflow* /* glyphOverflow */) const
{
TextRunWalker walker(run, 0, this);
walker.setWordSpacingAdjustment(wordSpacing());
walker.setLetterSpacingAdjustment(letterSpacing());
return walker.widthOfFullRun();
}
float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* /* fallbackFonts */, GlyphOverflow* /* glyphOverflow */) const
{
ComplexTextController controller(run, 0, 0, this);
controller.setWordSpacingAdjustment(wordSpacing());
controller.setLetterSpacingAdjustment(letterSpacing());
controller.setPadding(run.expansion());
return controller.widthOfFullRun();
}
void Font::drawComplexText(GraphicsContext* gc, const TextRun& run,
const FloatPoint& point, int from, int to) const
{
if (!run.length())
return;
SkCanvas* canvas = gc->platformContext()->canvas();
TextDrawingModeFlags textMode = gc->platformContext()->getTextDrawingMode();
bool fill = textMode & TextModeFill;
bool stroke = (textMode & TextModeStroke)
&& gc->platformContext()->getStrokeStyle() != NoStroke
&& gc->platformContext()->getStrokeThickness() > 0;
if (!fill && !stroke)
return;
SkPaint strokePaint, fillPaint;
if (fill) {
gc->platformContext()->setupPaintForFilling(&fillPaint);
setupForTextPainting(&fillPaint, gc->fillColor().rgb());
}
if (stroke) {
gc->platformContext()->setupPaintForStroking(&strokePaint, 0, 0);
setupForTextPainting(&strokePaint, gc->strokeColor().rgb());
}
ComplexTextController controller(run, point.x(), point.y(), this);
controller.setWordSpacingAdjustment(wordSpacing());
controller.setLetterSpacingAdjustment(letterSpacing());
controller.setPadding(run.expansion());
if (run.rtl()) {
// FIXME: this causes us to shape the text twice -- once to compute the width and then again
// below when actually rendering. Change ComplexTextController to match platform/mac and
// platform/chromium/win by having it store the shaped runs, so we can reuse the results.
controller.reset(point.x() + controller.widthOfFullRun());
// We need to set the padding again because ComplexTextController layout consumed the value.
// Fixing the above problem would help here too.
controller.setPadding(run.expansion());
}
while (controller.nextScriptRun()) {
if (fill) {
controller.fontPlatformDataForScriptRun()->setupPaint(&fillPaint);
adjustTextRenderMode(&fillPaint, gc->platformContext());
canvas->drawPosText(controller.glyphs(), controller.length() << 1, controller.positions(), fillPaint);
}
if (stroke) {
controller.fontPlatformDataForScriptRun()->setupPaint(&strokePaint);
adjustTextRenderMode(&strokePaint, gc->platformContext());
canvas->drawPosText(controller.glyphs(), controller.length() << 1, controller.positions(), strokePaint);
}
}
}
// Return the code point index for the given |x| offset into the text run.
int Font::offsetForPositionForComplexText(const TextRun& run, float xFloat,
bool includePartialGlyphs) const
{
// FIXME: This truncation is not a problem for HTML, but only affects SVG, which passes floating-point numbers
// to Font::offsetForPosition(). Bug http://webkit.org/b/40673 tracks fixing this problem.
int targetX = static_cast<int>(xFloat);
// (Mac code ignores includePartialGlyphs, and they don't know what it's
// supposed to do, so we just ignore it as well.)
ComplexTextController controller(run, 0, 0, this);
controller.setWordSpacingAdjustment(wordSpacing());
controller.setLetterSpacingAdjustment(letterSpacing());
controller.setPadding(run.expansion());
if (run.rtl()) {
// See FIXME in drawComplexText.
controller.reset(controller.widthOfFullRun());
controller.setPadding(run.expansion());
}
unsigned basePosition = 0;
int x = controller.offsetX();
while (controller.nextScriptRun()) {
int nextX = controller.offsetX();
if (std::min(x, nextX) <= targetX && targetX <= std::max(x, nextX)) {
// The x value in question is within this script run.
const int glyphIndex = glyphIndexForXPositionInScriptRun(controller, targetX);
// Now that we have a glyph index, we have to turn that into a
// code-point index. Because of ligatures, several code-points may
// have gone into a single glyph. We iterate over the clusters log
// and find the first code-point which contributed to the glyph.
// Some shapers (i.e. Khmer) will produce cluster logs which report
// that /no/ code points contributed to certain glyphs. Because of
// this, we take any code point which contributed to the glyph in
// question, or any subsequent glyph. If we run off the end, then
// we take the last code point.
const unsigned short* log = controller.logClusters();
for (unsigned j = 0; j < controller.numCodePoints(); ++j) {
if (log[j] >= glyphIndex)
return basePosition + j;
}
return basePosition + controller.numCodePoints() - 1;
}
basePosition += controller.numCodePoints();
}
return basePosition;
}
// Return the rectangle for selecting the given range of code-points in the TextRun.
FloatRect Font::selectionRectForComplexText(const TextRun& run,
const FloatPoint& point, int height,
int from, int to) const
{
int fromX = -1, toX = -1;
ComplexTextController controller(run, 0, 0, this);
controller.setWordSpacingAdjustment(wordSpacing());
controller.setLetterSpacingAdjustment(letterSpacing());
controller.setPadding(run.expansion());
if (run.rtl()) {
// See FIXME in drawComplexText.
controller.reset(controller.widthOfFullRun());
controller.setPadding(run.expansion());
}
// Iterate through the script runs in logical order, searching for the run covering the positions of interest.
while (controller.nextScriptRun() && (fromX == -1 || toX == -1)) {
if (fromX == -1 && from >= 0 && static_cast<unsigned>(from) < controller.numCodePoints()) {
// |from| is within this script run. So we index the clusters log to
// find which glyph this code-point contributed to and find its x
// position.
int glyph = controller.logClusters()[from];
fromX = controller.positions()[glyph].x();
if (controller.rtl())
fromX += truncateFixedPointToInteger(controller.advances()[glyph]);
} else
from -= controller.numCodePoints();
if (toX == -1 && to >= 0 && static_cast<unsigned>(to) < controller.numCodePoints()) {
int glyph = controller.logClusters()[to];
toX = controller.positions()[glyph].x();
if (controller.rtl())
toX += truncateFixedPointToInteger(controller.advances()[glyph]);
} else
to -= controller.numCodePoints();
}
// The position in question might be just after the text.
if (fromX == -1)
fromX = controller.offsetX();
if (toX == -1)
toX = controller.offsetX();
ASSERT(fromX != -1 && toX != -1);
if (fromX < toX)
return FloatRect(point.x() + fromX, point.y(), toX - fromX, height);
return FloatRect(point.x() + toX, point.y(), fromX - toX, height);
}
void Font::drawComplexText(GraphicsContext* gc, const TextRun& run,
const FloatPoint& point, int from, int to) const
{
if (!run.length())
return;
SkCanvas* canvas = gc->platformContext()->canvas();
int textMode = gc->platformContext()->getTextDrawingMode();
bool fill = textMode & cTextFill;
bool stroke = (textMode & cTextStroke)
&& gc->platformContext()->getStrokeStyle() != NoStroke
&& gc->platformContext()->getStrokeThickness() > 0;
if (!fill && !stroke)
return;
SkPaint strokePaint, fillPaint;
if (fill) {
gc->platformContext()->setupPaintForFilling(&fillPaint);
setupForTextPainting(&fillPaint, gc->fillColor().rgb());
}
if (stroke) {
gc->platformContext()->setupPaintForStroking(&strokePaint, 0, 0);
setupForTextPainting(&strokePaint, gc->strokeColor().rgb());
}
TextRunWalker walker(run, point.x(), this);
walker.setWordSpacingAdjustment(wordSpacing());
walker.setLetterSpacingAdjustment(letterSpacing());
walker.setPadding(run.padding());
while (walker.nextScriptRun()) {
if (fill) {
walker.fontPlatformDataForScriptRun()->setupPaint(&fillPaint);
adjustTextRenderMode(&fillPaint, gc->platformContext());
canvas->drawPosTextH(walker.glyphs(), walker.length() << 1, walker.xPositions(), point.y(), fillPaint);
}
if (stroke) {
walker.fontPlatformDataForScriptRun()->setupPaint(&strokePaint);
adjustTextRenderMode(&strokePaint, gc->platformContext());
canvas->drawPosTextH(walker.glyphs(), walker.length() << 1, walker.xPositions(), point.y(), strokePaint);
}
}
}
Font::CodePath Font::codePath(const TextRun& run) const
{
if (s_codePath != Auto)
return s_codePath;
#if ENABLE(SVG_FONTS)
if (run.renderingContext())
return Simple;
#endif
#if PLATFORM(QT) && !HAVE(QRAWFONT)
if (run.expansion() || run.rtl() || isSmallCaps() || wordSpacing() || letterSpacing())
return Complex;
#endif
if (m_fontDescription.featureSettings() && m_fontDescription.featureSettings()->size() > 0)
return Complex;
CodePath result = Simple;
// Start from 0 since drawing and highlighting also measure the characters before run->from
// FIXME: Should use a UnicodeSet in ports where ICU is used. Note that we
// can't simply use UnicodeCharacter Property/class because some characters
// are not 'combining', but still need to go to the complex path.
// Alternatively, we may as well consider binary search over a sorted
// list of ranges.
for (int i = 0; i < run.length(); i++) {
const UChar c = run[i];
if (c < 0x2E5) // U+02E5 through U+02E9 (Modifier Letters : Tone letters)
continue;
if (c <= 0x2E9)
return Complex;
if (c < 0x300) // U+0300 through U+036F Combining diacritical marks
continue;
if (c <= 0x36F)
return Complex;
if (c < 0x0591 || c == 0x05BE) // U+0591 through U+05CF excluding U+05BE Hebrew combining marks, Hebrew punctuation Paseq, Sof Pasuq and Nun Hafukha
continue;
if (c <= 0x05CF)
return Complex;
// U+0600 through U+109F Arabic, Syriac, Thaana, NKo, Samaritan, Mandaic,
// Devanagari, Bengali, Gurmukhi, Gujarati, Oriya, Tamil, Telugu, Kannada,
// Malayalam, Sinhala, Thai, Lao, Tibetan, Myanmar
if (c < 0x0600)
continue;
if (c <= 0x109F)
return Complex;
// U+1100 through U+11FF Hangul Jamo (only Ancient Korean should be left here if you precompose;
// Modern Korean will be precomposed as a result of step A)
if (c < 0x1100)
continue;
if (c <= 0x11FF)
return Complex;
if (c < 0x135D) // U+135D through U+135F Ethiopic combining marks
continue;
if (c <= 0x135F)
return Complex;
if (c < 0x1700) // U+1780 through U+18AF Tagalog, Hanunoo, Buhid, Taghanwa,Khmer, Mongolian
continue;
if (c <= 0x18AF)
return Complex;
if (c < 0x1900) // U+1900 through U+194F Limbu (Unicode 4.0)
continue;
if (c <= 0x194F)
return Complex;
if (c < 0x1980) // U+1980 through U+19DF New Tai Lue
continue;
if (c <= 0x19DF)
return Complex;
if (c < 0x1A00) // U+1A00 through U+1CFF Buginese, Tai Tham, Balinese, Batak, Lepcha, Vedic
continue;
if (c <= 0x1CFF)
return Complex;
if (c < 0x1DC0) // U+1DC0 through U+1DFF Comining diacritical mark supplement
continue;
if (c <= 0x1DFF)
return Complex;
// U+1E00 through U+2000 characters with diacritics and stacked diacritics
if (c <= 0x2000) {
result = SimpleWithGlyphOverflow;
continue;
}
if (c < 0x20D0) // U+20D0 through U+20FF Combining marks for symbols
continue;
if (c <= 0x20FF)
return Complex;
if (c < 0x2CEF) // U+2CEF through U+2CF1 Combining marks for Coptic
continue;
if (c <= 0x2CF1)
return Complex;
if (c < 0x302A) // U+302A through U+302F Ideographic and Hangul Tone marks
continue;
if (c <= 0x302F)
return Complex;
if (c < 0xA67C) // U+A67C through U+A67D Combining marks for old Cyrillic
continue;
if (c <= 0xA67D)
return Complex;
if (c < 0xA6F0) // U+A6F0 through U+A6F1 Combining mark for Bamum
continue;
if (c <= 0xA6F1)
return Complex;
// U+A800 through U+ABFF Nagri, Phags-pa, Saurashtra, Devanagari Extended,
// Hangul Jamo Ext. A, Javanese, Myanmar Extended A, Tai Viet, Meetei Mayek,
if (c < 0xA800)
continue;
if (c <= 0xABFF)
return Complex;
if (c < 0xD7B0) // U+D7B0 through U+D7FF Hangul Jamo Ext. B
continue;
if (c <= 0xD7FF)
return Complex;
if (c <= 0xDBFF) {
// High surrogate
if (i == run.length() - 1)
continue;
UChar next = run[++i];
if (!U16_IS_TRAIL(next))
continue;
UChar32 supplementaryCharacter = U16_GET_SUPPLEMENTARY(c, next);
if (supplementaryCharacter < 0x1F1E6) // U+1F1E6 through U+1F1FF Regional Indicator Symbols
continue;
if (supplementaryCharacter <= 0x1F1FF)
return Complex;
if (supplementaryCharacter < 0xE0100) // U+E0100 through U+E01EF Unicode variation selectors.
continue;
if (supplementaryCharacter <= 0xE01EF)
return Complex;
// FIXME: Check for Brahmi (U+11000 block), Kaithi (U+11080 block) and other complex scripts
// in plane 1 or higher.
continue;
}
if (c < 0xFE00) // U+FE00 through U+FE0F Unicode variation selectors
continue;
if (c <= 0xFE0F)
return Complex;
if (c < 0xFE20) // U+FE20 through U+FE2F Combining half marks
continue;
if (c <= 0xFE2F)
return Complex;
}
if (run.length() > 1 && typesettingFeatures())
return Complex;
return result;
}
Font::CodePath Font::codePath(const TextRun& run) const
{
if (s_codePath != Auto)
return s_codePath;
#if PLATFORM(QT)
if (run.expansion() || run.rtl() || isSmallCaps() || wordSpacing() || letterSpacing())
return Complex;
#endif
CodePath result = Simple;
// Start from 0 since drawing and highlighting also measure the characters before run->from
for (int i = 0; i < run.length(); i++) {
const UChar c = run[i];
if (c < 0x300) // U+0300 through U+036F Combining diacritical marks
continue;
if (c <= 0x36F)
return Complex;
if (c < 0x0591 || c == 0x05BE) // U+0591 through U+05CF excluding U+05BE Hebrew combining marks, Hebrew punctuation Paseq, Sof Pasuq and Nun Hafukha
continue;
if (c <= 0x05CF)
return Complex;
if (c < 0x0600) // U+0600 through U+1059 Arabic, Syriac, Thaana, Devanagari, Bengali, Gurmukhi, Gujarati, Oriya, Tamil, Telugu, Kannada, Malayalam, Sinhala, Thai, Lao, Tibetan, Myanmar
continue;
if (c <= 0x1059)
return Complex;
if (c < 0x1100) // U+1100 through U+11FF Hangul Jamo (only Ancient Korean should be left here if you precompose; Modern Korean will be precomposed as a result of step A)
continue;
if (c <= 0x11FF)
return Complex;
if (c < 0x1780) // U+1780 through U+18AF Khmer, Mongolian
continue;
if (c <= 0x18AF)
return Complex;
if (c < 0x1900) // U+1900 through U+194F Limbu (Unicode 4.0)
continue;
if (c <= 0x194F)
return Complex;
if (c < 0x1E00) // U+1E00 through U+2000 characters with diacritics and stacked diacritics
continue;
if (c <= 0x2000) {
result = SimpleWithGlyphOverflow;
continue;
}
if (c < 0x20D0) // U+20D0 through U+20FF Combining marks for symbols
continue;
if (c <= 0x20FF)
return Complex;
if (c < 0xFE20) // U+FE20 through U+FE2F Combining half marks
continue;
if (c <= 0xFE2F)
return Complex;
}
#if ENABLE(SAMSUNG_WEBKIT_PERFORMANCE_PATCH)
// SAMSUNG CHANGE : Webkit Performance Patch Merge + r94303
if (run.length() > 1 && typesettingFeatures())
#else
if (typesettingFeatures())
// SAMSUNG CHANGE : Webkit Performance Patch Merge -
#endif
return Complex;
return result;
}
// Return the rectangle for selecting the given range of code-points in the TextRun.
FloatRect Font::selectionRectForComplexText(const TextRun& run,
const FloatPoint& point, int height,
int from, int to) const
{
int fromX = -1, toX = -1, fromAdvance = -1, toAdvance = -1;
TextRunWalker walker(run, 0, this);
walker.setWordSpacingAdjustment(wordSpacing());
walker.setLetterSpacingAdjustment(letterSpacing());
// Base will point to the x offset for the current script run. Note that, in
// the LTR case, width will be 0.
int base = walker.rtl() ? walker.widthOfFullRun() : 0;
const int leftEdge = base;
// We want to enumerate the script runs in code point order in the following
// code. This call also resets |walker|.
walker.setBackwardsIteration(false);
while (walker.nextScriptRun() && (fromX == -1 || toX == -1)) {
// TextRunWalker will helpfully accululate the x offsets for different
// script runs for us. For this code, however, we always want the x offsets
// to start from zero so we call this before each script run.
walker.setXOffsetToZero();
if (walker.rtl())
base -= walker.width();
if (fromX == -1 && from < walker.numCodePoints()) {
// |from| is within this script run. So we index the clusters log to
// find which glyph this code-point contributed to and find its x
// position.
int glyph = walker.logClusters()[from];
fromX = base + walker.xPositions()[glyph];
fromAdvance = walker.advances()[glyph];
} else
from -= walker.numCodePoints();
if (toX == -1 && to < walker.numCodePoints()) {
int glyph = walker.logClusters()[to];
toX = base + walker.xPositions()[glyph];
toAdvance = walker.advances()[glyph];
} else
to -= walker.numCodePoints();
if (!walker.rtl())
base += walker.width();
}
// The position in question might be just after the text.
const int rightEdge = base;
if (fromX == -1 && !from)
fromX = leftEdge;
else if (walker.rtl())
fromX += truncateFixedPointToInteger(fromAdvance);
if (toX == -1 && !to)
toX = rightEdge;
ASSERT(fromX != -1 && toX != -1);
if (fromX < toX)
return FloatRect(point.x() + fromX, point.y(), toX - fromX, height);
return FloatRect(point.x() + toX, point.y(), fromX - toX, height);
}
// Return the code point index for the given |x| offset into the text run.
int Font::offsetForPositionForComplexText(const TextRun& run, float xFloat,
bool includePartialGlyphs) const
{
// FIXME: This truncation is not a problem for HTML, but only affects SVG, which passes floating-point numbers
// to Font::offsetForPosition(). Bug http://webkit.org/b/40673 tracks fixing this problem.
int x = static_cast<int>(xFloat);
// (Mac code ignores includePartialGlyphs, and they don't know what it's
// supposed to do, so we just ignore it as well.)
TextRunWalker walker(run, 0, this);
walker.setWordSpacingAdjustment(wordSpacing());
walker.setLetterSpacingAdjustment(letterSpacing());
// If this is RTL text, the first glyph from the left is actually the last
// code point. So we need to know how many code points there are total in
// order to subtract. This is different from the length of the TextRun
// because UTF-16 surrogate pairs are a single code point, but 32-bits long.
// In LTR we leave this as 0 so that we get the correct value for
// |basePosition|, below.
unsigned totalCodePoints = 0;
if (walker.rtl()) {
ssize_t offset = 0;
while (offset < run.length()) {
utf16_to_code_point(run.characters(), run.length(), &offset);
totalCodePoints++;
}
}
unsigned basePosition = totalCodePoints;
// For RTL:
// code-point order: abcd efg hijkl
// on screen: lkjih gfe dcba
// ^ ^
// | |
// basePosition--| |
// totalCodePoints----|
// Since basePosition is currently the total number of code-points, the
// first thing we do is decrement it so that it's pointing to the start of
// the current script-run.
//
// For LTR, basePosition is zero so it already points to the start of the
// first script run.
while (walker.nextScriptRun()) {
if (walker.rtl())
basePosition -= walker.numCodePoints();
if (x >= 0 && x < walker.width()) {
// The x value in question is within this script run. We consider
// each glyph in presentation order and stop when we find the one
// covering this position.
const int glyphIndex = glyphIndexForXPositionInScriptRun(walker, x);
// Now that we have a glyph index, we have to turn that into a
// code-point index. Because of ligatures, several code-points may
// have gone into a single glyph. We iterate over the clusters log
// and find the first code-point which contributed to the glyph.
// Some shapers (i.e. Khmer) will produce cluster logs which report
// that /no/ code points contributed to certain glyphs. Because of
// this, we take any code point which contributed to the glyph in
// question, or any subsequent glyph. If we run off the end, then
// we take the last code point.
const unsigned short* log = walker.logClusters();
for (unsigned j = 0; j < walker.numCodePoints(); ++j) {
if (log[j] >= glyphIndex)
return basePosition + j;
}
return basePosition + walker.numCodePoints() - 1;
}
x -= walker.width();
if (!walker.rtl())
basePosition += walker.numCodePoints();
}
return basePosition;
}