void GraphicsContext::drawBidiText(const Font& font, const TextRun& run, const FloatPoint& point)
{
if (paintingDisabled())
return;
BidiResolver<TextRunIterator, BidiCharacterRun> bidiResolver;
bidiResolver.setStatus(BidiStatus(run.direction(), run.directionalOverride()));
bidiResolver.setPosition(TextRunIterator(&run, 0));
// FIXME: This ownership should be reversed. We should pass BidiRunList
// to BidiResolver in createBidiRunsForLine.
BidiRunList<BidiCharacterRun>& bidiRuns = bidiResolver.runs();
bidiResolver.createBidiRunsForLine(TextRunIterator(&run, run.length()));
if (!bidiRuns.runCount())
return;
FloatPoint currPoint = point;
BidiCharacterRun* bidiRun = bidiRuns.firstRun();
while (bidiRun) {
TextRun subrun = run;
subrun.setText(run.data(bidiRun->start()), bidiRun->stop() - bidiRun->start());
bool isRTL = bidiRun->level() % 2;
subrun.setDirection(isRTL ? RTL : LTR);
subrun.setDirectionalOverride(bidiRun->dirOverride(false));
font.drawText(this, subrun, currPoint);
bidiRun = bidiRun->next();
// FIXME: Have Font::drawText return the width of what it drew so that we don't have to re-measure here.
if (bidiRun)
currPoint.move(font.width(subrun), 0);
}
bidiRuns.deleteRuns();
}
TextDirection directionForRun(TextRun& run, bool& hasStrongDirectionality)
{
BidiResolver<TextRunIterator, BidiCharacterRun> bidiResolver;
bidiResolver.setStatus(BidiStatus(run.direction(), run.directionalOverride()));
bidiResolver.setPositionIgnoringNestedIsolates(TextRunIterator(&run, 0));
return bidiResolver.determineParagraphDirectionality(&hasStrongDirectionality);
}
PassRefPtr<ShapeResult> ShapeResult::createForTabulationCharacters(const Font* font,
const TextRun& textRun, float positionOffset, unsigned count)
{
const SimpleFontData* fontData = font->primaryFont();
OwnPtr<ShapeResult::RunInfo> run = adoptPtr(new ShapeResult::RunInfo(fontData,
// Tab characters are always LTR or RTL, not TTB, even when isVerticalAnyUpright().
textRun.rtl() ? HB_DIRECTION_RTL : HB_DIRECTION_LTR,
HB_SCRIPT_COMMON, 0, count, count));
float position = textRun.xPos() + positionOffset;
float startPosition = position;
for (unsigned i = 0; i < count; i++) {
float advance = font->tabWidth(*fontData, textRun.getTabSize(), position);
run->m_glyphData[i].characterIndex = i;
run->setGlyphAndPositions(i, fontData->spaceGlyph(), advance, 0, 0);
position += advance;
}
run->m_width = position - startPosition;
RefPtr<ShapeResult> result = ShapeResult::create(font, count, textRun.direction());
result->m_width = run->m_width;
result->m_numGlyphs = count;
ASSERT(result->m_numGlyphs == count); // no overflow
result->m_hasVerticalOffsets = fontData->platformData().isVerticalAnyUpright();
result->m_runs.append(run.release());
return result.release();
}
void GraphicsContext::drawBidiText(const FontCascade& font, const TextRun& run, const FloatPoint& point, FontCascade::CustomFontNotReadyAction customFontNotReadyAction)
{
if (paintingDisabled())
return;
BidiResolver<TextRunIterator, BidiCharacterRun> bidiResolver;
bidiResolver.setStatus(BidiStatus(run.direction(), run.directionalOverride()));
bidiResolver.setPositionIgnoringNestedIsolates(TextRunIterator(&run, 0));
// FIXME: This ownership should be reversed. We should pass BidiRunList
// to BidiResolver in createBidiRunsForLine.
BidiRunList<BidiCharacterRun>& bidiRuns = bidiResolver.runs();
bidiResolver.createBidiRunsForLine(TextRunIterator(&run, run.length()));
if (!bidiRuns.runCount())
return;
FloatPoint currPoint = point;
BidiCharacterRun* bidiRun = bidiRuns.firstRun();
while (bidiRun) {
TextRun subrun = run.subRun(bidiRun->start(), bidiRun->stop() - bidiRun->start());
bool isRTL = bidiRun->level() % 2;
subrun.setDirection(isRTL ? RTL : LTR);
subrun.setDirectionalOverride(bidiRun->dirOverride(false));
float width = font.drawText(*this, subrun, currPoint, 0, -1, customFontNotReadyAction);
currPoint.move(width, 0);
bidiRun = bidiRun->next();
}
bidiRuns.deleteRuns();
}
CharacterRange CachingWordShaper::getCharacterRange(const Font* font,
const TextRun& run, unsigned from, unsigned to)
{
ShapeResultBuffer buffer;
float totalWidth = shapeResultsForRun(m_shapeCache, font, run, nullptr,
&buffer);
return buffer.getCharacterRange(run.direction(), totalWidth, from, to);
}
FloatRect CachingWordShaper::selectionRect(const Font* font, const TextRun& run,
const FloatPoint& point, int height, unsigned from, unsigned to)
{
Vector<RefPtr<ShapeResult>> results;
float totalWidth = shapeResultsForRun(m_shapeCache, font, run, nullptr,
&results);
return ShapeResult::selectionRect(results, run.direction(), totalWidth,
point, height, from, to);
}
TextRunComponent::TextRunComponent(const UChar *start, int length, const TextRun& parentTextRun, const Font &font, int o)
: m_textRun(start, length, 0, 0
, parentTextRun.allowsTrailingExpansion() ? TextRun::AllowTrailingExpansion : TextRun::ForbidTrailingExpansion
, parentTextRun.direction()
, parentTextRun.directionalOverride())
, m_offset(o)
, m_spaces(0)
{
m_textRun.setTabSize(parentTextRun.allowTabs(), parentTextRun.tabSize());
WidthIterator it(&font, m_textRun);
it.advance(m_textRun.length(), 0);
m_width = it.m_runWidthSoFar;
}
FloatRect CachingWordShaper::selectionRect(const Font* font, const TextRun& run,
const FloatPoint& point, int height, unsigned from, unsigned to)
{
#ifdef MINIBLINK_NOT_IMPLEMENTED
Vector<RefPtr<ShapeResult>> results;
float totalWidth = shapeResultsForRun(m_shapeCache, font, run, nullptr,
&results);
return ShapeResult::selectionRect(results, run.direction(), totalWidth,
point, height, from, to);
#endif // MINIBLINK_NOT_IMPLEMENTED
notImplemented();
return FloatRect();
}
Vector<CharacterRange> CachingWordShaper::individualCharacterRanges(
const Font* font, const TextRun& run)
{
ShapeResultBuffer buffer;
float totalWidth = shapeResultsForRun(m_shapeCache, font, run, nullptr,
&buffer);
auto ranges = buffer.individualCharacterRanges(run.direction(), totalWidth);
// The shaper can fail to return glyph metrics for all characters (see
// crbug.com/613915 and crbug.com/615661) so add empty ranges to ensure all
// characters have an associated range.
while (ranges.size() < static_cast<unsigned>(run.length()))
ranges.append(CharacterRange(0, 0));
return ranges;
}
TextDirection directionForRun(TextRun& run, bool* hasStrongDirectionality)
{
if (!hasStrongDirectionality) {
// 8bit is Latin-1 and therefore is always LTR.
if (run.is8Bit())
return LTR;
// length == 1 for more than 90% of cases of width() for CJK text.
if (run.length() == 1 && U16_IS_SINGLE(run.characters16()[0]))
return directionForCharacter(run.characters16()[0]);
}
BidiResolver<TextRunIterator, BidiCharacterRun> bidiResolver;
bidiResolver.setStatus(BidiStatus(run.direction(), run.directionalOverride()));
bidiResolver.setPositionIgnoringNestedIsolates(TextRunIterator(&run, 0));
return bidiResolver.determineParagraphDirectionality(hasStrongDirectionality);
}
void ImagePainter::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
LayoutUnit cWidth = m_renderImage.contentWidth();
LayoutUnit cHeight = m_renderImage.contentHeight();
GraphicsContext* context = paintInfo.context;
if (!m_renderImage.imageResource()->hasImage() || m_renderImage.imageResource()->errorOccurred()) {
if (paintInfo.phase == PaintPhaseSelection)
return;
if (cWidth > 2 && cHeight > 2) {
const int borderWidth = 1;
LayoutUnit leftBorder = m_renderImage.borderLeft();
LayoutUnit topBorder = m_renderImage.borderTop();
LayoutUnit leftPad = m_renderImage.paddingLeft();
LayoutUnit topPad = m_renderImage.paddingTop();
// Draw an outline rect where the image should be.
IntRect paintRect = pixelSnappedIntRect(LayoutRect(paintOffset.x() + leftBorder + leftPad, paintOffset.y() + topBorder + topPad, cWidth, cHeight));
DrawingRecorder recorder(context, &m_renderImage, paintInfo.phase, paintRect);
context->setStrokeStyle(SolidStroke);
context->setStrokeColor(Color::lightGray);
context->setFillColor(Color::transparent);
context->drawRect(paintRect);
bool errorPictureDrawn = false;
LayoutSize imageOffset;
// When calculating the usable dimensions, exclude the pixels of
// the ouline rect so the error image/alt text doesn't draw on it.
LayoutUnit usableWidth = cWidth - 2 * borderWidth;
LayoutUnit usableHeight = cHeight - 2 * borderWidth;
RefPtr<Image> image = m_renderImage.imageResource()->image();
if (m_renderImage.imageResource()->errorOccurred() && !image->isNull() && usableWidth >= image->width() && usableHeight >= image->height()) {
float deviceScaleFactor = blink::deviceScaleFactor(m_renderImage.frame());
// Call brokenImage() explicitly to ensure we get the broken image icon at the appropriate resolution.
pair<Image*, float> brokenImageAndImageScaleFactor = ImageResource::brokenImage(deviceScaleFactor);
image = brokenImageAndImageScaleFactor.first;
IntSize imageSize = image->size();
imageSize.scale(1 / brokenImageAndImageScaleFactor.second);
// Center the error image, accounting for border and padding.
LayoutUnit centerX = (usableWidth - imageSize.width()) / 2;
if (centerX < 0)
centerX = 0;
LayoutUnit centerY = (usableHeight - imageSize.height()) / 2;
if (centerY < 0)
centerY = 0;
imageOffset = LayoutSize(leftBorder + leftPad + centerX + borderWidth, topBorder + topPad + centerY + borderWidth);
context->drawImage(image.get(), pixelSnappedIntRect(LayoutRect(paintOffset + imageOffset, imageSize)), CompositeSourceOver, m_renderImage.shouldRespectImageOrientation());
errorPictureDrawn = true;
}
if (!m_renderImage.altText().isEmpty()) {
const Font& font = m_renderImage.style()->font();
const FontMetrics& fontMetrics = font.fontMetrics();
LayoutUnit ascent = fontMetrics.ascent();
LayoutPoint textRectOrigin = paintOffset;
textRectOrigin.move(leftBorder + leftPad + (RenderImage::paddingWidth / 2) - borderWidth, topBorder + topPad + (RenderImage::paddingHeight / 2) - borderWidth);
LayoutPoint textOrigin(textRectOrigin.x(), textRectOrigin.y() + ascent);
// Only draw the alt text if it'll fit within the content box,
// and only if it fits above the error image.
TextRun textRun = constructTextRun(&m_renderImage, font, m_renderImage.altText(), m_renderImage.style(), TextRun::AllowTrailingExpansion | TextRun::ForbidLeadingExpansion, DefaultTextRunFlags | RespectDirection);
float textWidth = font.width(textRun);
TextRunPaintInfo textRunPaintInfo(textRun);
textRunPaintInfo.bounds = FloatRect(textRectOrigin, FloatSize(textWidth, fontMetrics.height()));
context->setFillColor(m_renderImage.resolveColor(CSSPropertyColor));
if (textRun.direction() == RTL) {
int availableWidth = cWidth - static_cast<int>(RenderImage::paddingWidth);
textOrigin.move(availableWidth - ceilf(textWidth), 0);
}
if (errorPictureDrawn) {
if (usableWidth >= textWidth && fontMetrics.height() <= imageOffset.height())
context->drawBidiText(font, textRunPaintInfo, textOrigin);
} else if (usableWidth >= textWidth && usableHeight >= fontMetrics.height()) {
context->drawBidiText(font, textRunPaintInfo, textOrigin);
}
}
}
} else if (m_renderImage.imageResource()->hasImage() && cWidth > 0 && cHeight > 0) {
LayoutRect contentRect = m_renderImage.contentBoxRect();
contentRect.moveBy(paintOffset);
LayoutRect paintRect = m_renderImage.replacedContentRect();
paintRect.moveBy(paintOffset);
DrawingRecorder recorder(context, &m_renderImage, paintInfo.phase, contentRect);
bool clip = !contentRect.contains(paintRect);
if (clip) {
context->save();
context->clip(contentRect);
}
paintIntoRect(context, paintRect);
if (clip)
context->restore();
}
}
PassOwnPtr<DragImage> DragImage::create(const KURL& url, const String& inLabel, const FontDescription& systemFont, float deviceScaleFactor)
{
const Font labelFont = deriveDragLabelFont(kDragLinkLabelFontSize, FontWeightBold, systemFont);
const Font urlFont = deriveDragLabelFont(kDragLinkUrlFontSize, FontWeightNormal, systemFont);
FontCachePurgePreventer fontCachePurgePreventer;
bool drawURLString = true;
bool clipURLString = false;
bool clipLabelString = false;
String urlString = url.string();
String label = inLabel.stripWhiteSpace();
if (label.isEmpty()) {
drawURLString = false;
label = urlString;
}
// First step is drawing the link drag image width.
TextRun labelRun(label.impl());
TextRun urlRun(urlString.impl());
IntSize labelSize(labelFont.width(labelRun), labelFont.fontMetrics().ascent() + labelFont.fontMetrics().descent());
if (labelSize.width() > kMaxDragLabelStringWidth) {
labelSize.setWidth(kMaxDragLabelStringWidth);
clipLabelString = true;
}
IntSize urlStringSize;
IntSize imageSize(labelSize.width() + kDragLabelBorderX * 2, labelSize.height() + kDragLabelBorderY * 2);
if (drawURLString) {
urlStringSize.setWidth(urlFont.width(urlRun));
urlStringSize.setHeight(urlFont.fontMetrics().ascent() + urlFont.fontMetrics().descent());
imageSize.setHeight(imageSize.height() + urlStringSize.height());
if (urlStringSize.width() > kMaxDragLabelStringWidth) {
imageSize.setWidth(kMaxDragLabelWidth);
clipURLString = true;
} else
imageSize.setWidth(std::max(labelSize.width(), urlStringSize.width()) + kDragLabelBorderX * 2);
}
// We now know how big the image needs to be, so we create and
// fill the background
IntSize scaledImageSize = imageSize;
scaledImageSize.scale(deviceScaleFactor);
OwnPtr<ImageBuffer> buffer(ImageBuffer::create(scaledImageSize));
if (!buffer)
return nullptr;
buffer->context()->scale(FloatSize(deviceScaleFactor, deviceScaleFactor));
const float DragLabelRadius = 5;
const IntSize radii(DragLabelRadius, DragLabelRadius);
IntRect rect(IntPoint(), imageSize);
const Color backgroundColor(140, 140, 140);
buffer->context()->fillRoundedRect(rect, radii, radii, radii, radii, backgroundColor);
// Draw the text
if (drawURLString) {
if (clipURLString)
urlString = StringTruncator::centerTruncate(urlString, imageSize.width() - (kDragLabelBorderX * 2.0f), urlFont, StringTruncator::EnableRoundingHacks);
IntPoint textPos(kDragLabelBorderX, imageSize.height() - (kLabelBorderYOffset + urlFont.fontMetrics().descent()));
TextRun textRun(urlString);
buffer->context()->drawText(urlFont, TextRunPaintInfo(textRun), textPos);
}
if (clipLabelString)
label = StringTruncator::rightTruncate(label, imageSize.width() - (kDragLabelBorderX * 2.0f), labelFont, StringTruncator::EnableRoundingHacks);
bool hasStrongDirectionality;
TextRun textRun = textRunWithDirectionality(label, hasStrongDirectionality);
IntPoint textPos(kDragLabelBorderX, kDragLabelBorderY + labelFont.fontDescription().computedPixelSize());
if (hasStrongDirectionality && textRun.direction() == RTL) {
float textWidth = urlFont.width(textRun);
int availableWidth = imageSize.width() - kDragLabelBorderX * 2;
textPos.setX(availableWidth - ceilf(textWidth));
}
buffer->context()->drawBidiText(urlFont, TextRunPaintInfo(textRun), textPos);
RefPtr<Image> image = buffer->copyImage();
return DragImage::create(image.get(), DoNotRespectImageOrientation, deviceScaleFactor);
}
float GraphicsContext::drawBidiText(const Font& font, const TextRun& run, const FloatPoint& point, Font::CustomFontNotReadyAction customFontNotReadyAction, BidiStatus* status, int length)
#endif
{
if (paintingDisabled())
#if !PLATFORM(IOS)
return;
#else
return 0;
#endif
BidiResolver<TextRunIterator, BidiCharacterRun> bidiResolver;
#if !PLATFORM(IOS)
bidiResolver.setStatus(BidiStatus(run.direction(), run.directionalOverride()));
#else
bidiResolver.setStatus(status ? *status : BidiStatus(run.direction(), run.directionalOverride()));
#endif
bidiResolver.setPositionIgnoringNestedIsolates(TextRunIterator(&run, 0));
// FIXME: This ownership should be reversed. We should pass BidiRunList
// to BidiResolver in createBidiRunsForLine.
BidiRunList<BidiCharacterRun>& bidiRuns = bidiResolver.runs();
#if !PLATFORM(IOS)
bidiResolver.createBidiRunsForLine(TextRunIterator(&run, run.length()));
#else
bidiResolver.createBidiRunsForLine(TextRunIterator(&run, length < 0 ? run.length() : length));
#endif
if (!bidiRuns.runCount())
#if !PLATFORM(IOS)
return;
#else
return 0;
#endif
FloatPoint currPoint = point;
BidiCharacterRun* bidiRun = bidiRuns.firstRun();
while (bidiRun) {
TextRun subrun = run.subRun(bidiRun->start(), bidiRun->stop() - bidiRun->start());
bool isRTL = bidiRun->level() % 2;
subrun.setDirection(isRTL ? RTL : LTR);
subrun.setDirectionalOverride(bidiRun->dirOverride(false));
#if !PLATFORM(IOS)
font.drawText(this, subrun, currPoint, 0, -1, customFontNotReadyAction);
bidiRun = bidiRun->next();
// FIXME: Have Font::drawText return the width of what it drew so that we don't have to re-measure here.
if (bidiRun)
currPoint.move(font.width(subrun), 0);
#else
float width = font.drawText(this, subrun, currPoint, 0, -1, customFontNotReadyAction);
currPoint.move(width, 0);
bidiRun = bidiRun->next();
#endif
}
#if PLATFORM(IOS)
if (status)
*status = bidiResolver.status();
#endif
bidiRuns.deleteRuns();
#if PLATFORM(IOS)
return currPoint.x() - static_cast<float>(point.x());
#endif
}
float ShapeResult::fillGlyphBufferForTextEmphasisRun(GlyphBuffer* glyphBuffer,
const RunInfo* run, const TextRun& textRun, const GlyphData* emphasisData,
float initialAdvance, unsigned from, unsigned to, unsigned runOffset)
{
if (!run)
return 0;
unsigned graphemesInCluster = 1;
float clusterAdvance = 0;
FloatPoint glyphCenter = emphasisData->fontData->
boundsForGlyph(emphasisData->glyph).center();
TextDirection direction = textRun.direction();
// A "cluster" in this context means a cluster as it is used by HarfBuzz:
// The minimal group of characters and corresponding glyphs, that cannot be broken
// down further from a text shaping point of view.
// A cluster can contain multiple glyphs and grapheme clusters, with mutually
// overlapping boundaries. Below we count grapheme clusters per HarfBuzz clusters,
// then linearly split the sum of corresponding glyph advances by the number of
// grapheme clusters in order to find positions for emphasis mark drawing.
uint16_t clusterStart = direction == RTL
? run->m_startIndex + run->m_numCharacters + runOffset
: run->glyphToCharacterIndex(0) + runOffset;
float advanceSoFar = initialAdvance;
unsigned numGlyphs = run->m_numGlyphs;
for (unsigned i = 0; i < numGlyphs; ++i) {
const HarfBuzzRunGlyphData& glyphData = run->m_glyphData[i];
uint16_t currentCharacterIndex = run->m_startIndex + glyphData.characterIndex + runOffset;
bool isRunEnd = (i + 1 == numGlyphs);
bool isClusterEnd = isRunEnd || (run->glyphToCharacterIndex(i + 1) + runOffset != currentCharacterIndex);
if ((direction == RTL && currentCharacterIndex >= to) || (direction != RTL && currentCharacterIndex < from)) {
advanceSoFar += glyphData.advance;
direction == RTL ? --clusterStart : ++clusterStart;
continue;
}
clusterAdvance += glyphData.advance;
if (textRun.is8Bit()) {
float glyphAdvanceX = glyphData.advance;
if (Character::canReceiveTextEmphasis(textRun[currentCharacterIndex])) {
addEmphasisMark(glyphBuffer, emphasisData, glyphCenter, advanceSoFar + glyphAdvanceX / 2);
}
advanceSoFar += glyphAdvanceX;
} else if (isClusterEnd) {
uint16_t clusterEnd;
if (direction == RTL)
clusterEnd = currentCharacterIndex;
else
clusterEnd = isRunEnd ? run->m_startIndex + run->m_numCharacters + runOffset : run->glyphToCharacterIndex(i + 1) + runOffset;
graphemesInCluster = countGraphemesInCluster(textRun.characters16(), textRun.charactersLength(), clusterStart, clusterEnd);
if (!graphemesInCluster || !clusterAdvance)
continue;
float glyphAdvanceX = clusterAdvance / graphemesInCluster;
for (unsigned j = 0; j < graphemesInCluster; ++j) {
// Do not put emphasis marks on space, separator, and control characters.
if (Character::canReceiveTextEmphasis(textRun[currentCharacterIndex]))
addEmphasisMark(glyphBuffer, emphasisData, glyphCenter, advanceSoFar + glyphAdvanceX / 2);
advanceSoFar += glyphAdvanceX;
}
clusterStart = clusterEnd;
clusterAdvance = 0;
}
}
return advanceSoFar - initialAdvance;
}