| /* |
| * (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 2000 Dirk Mueller (mueller@kde.org) |
| * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #include "config.h" |
| #include "TextPainter.h" |
| |
| #include "GraphicsContext.h" |
| #include "InlineTextBox.h" |
| #include "RenderCombineText.h" |
| #include "TextPaintStyle.h" |
| #include <wtf/NeverDestroyed.h> |
| |
| namespace WebCore { |
| |
| TextPainter::TextPainter(GraphicsContext& context, bool paintSelectedTextOnly, bool paintSelectedTextSeparately, const FontCascade& font, |
| int startPositionInTextRun, int endPositionInTextBoxString, int length, const AtomicString& emphasisMark, RenderCombineText* combinedText, TextRun& textRun, |
| FloatRect& boxRect, FloatPoint& textOrigin, int emphasisMarkOffset, const ShadowData* textShadow, const ShadowData* selectionShadow, |
| bool textBoxIsHorizontal, TextPaintStyle& textPaintStyle, TextPaintStyle& selectionPaintStyle) |
| : m_context(context) |
| , m_textPaintStyle(textPaintStyle) |
| , m_selectionPaintStyle(selectionPaintStyle) |
| , m_textShadow(textShadow) |
| , m_selectionShadow(selectionShadow) |
| , m_paintSelectedTextOnly(paintSelectedTextOnly) |
| , m_paintSelectedTextSeparately(paintSelectedTextSeparately) |
| , m_font(font) |
| , m_startPositionInTextRun(startPositionInTextRun) |
| , m_endPositionInTextRun(endPositionInTextBoxString) |
| , m_length(length) |
| , m_emphasisMark(emphasisMark) |
| , m_combinedText(combinedText) |
| , m_textRun(textRun) |
| , m_boxRect(boxRect) |
| , m_textOrigin(textOrigin) |
| , m_emphasisMarkOffset(emphasisMarkOffset) |
| , m_textBoxIsHorizontal(textBoxIsHorizontal) |
| { |
| } |
| |
| static void drawTextOrEmphasisMarks(GraphicsContext& context, const FontCascade& font, const TextRun& textRun, const AtomicString& emphasisMark, |
| int emphasisMarkOffset, const FloatPoint& point, const int from, const int to) |
| { |
| if (emphasisMark.isEmpty()) |
| context.drawText(font, textRun, point, from, to); |
| else |
| context.drawEmphasisMarks(font, textRun, emphasisMark, point + IntSize(0, emphasisMarkOffset), from, to); |
| } |
| |
| ShadowApplier::ShadowApplier(GraphicsContext& context, const ShadowData* shadow, const FloatRect& textRect, bool lastShadowIterationShouldDrawText, bool opaque, FontOrientation orientation) |
| : m_context(context) |
| , m_shadow(shadow) |
| , m_onlyDrawsShadow(!isLastShadowIteration() || !lastShadowIterationShouldDrawText) |
| , m_avoidDrawingShadow(shadowIsCompletelyCoveredByText(opaque)) |
| , m_nothingToDraw(shadow && m_avoidDrawingShadow && m_onlyDrawsShadow) |
| , m_didSaveContext(false) |
| { |
| if (!shadow || m_nothingToDraw) { |
| m_shadow = nullptr; |
| return; |
| } |
| |
| int shadowX = orientation == Horizontal ? shadow->x() : shadow->y(); |
| int shadowY = orientation == Horizontal ? shadow->y() : -shadow->x(); |
| FloatSize shadowOffset(shadowX, shadowY); |
| int shadowRadius = shadow->radius(); |
| const Color& shadowColor = shadow->color(); |
| |
| // When drawing shadows, we usually clip the context to the area the shadow will reside, and then |
| // draw the text itself outside the clipped area (so only the shadow shows up). However, we can |
| // often draw the *last* shadow and the text itself in a single call. |
| if (m_onlyDrawsShadow) { |
| FloatRect shadowRect(textRect); |
| shadowRect.inflate(shadow->paintingExtent()); |
| shadowRect.move(shadowOffset); |
| context.save(); |
| context.clip(shadowRect); |
| |
| m_didSaveContext = true; |
| m_extraOffset = FloatSize(0, 2 * textRect.height() + std::max(0.0f, shadowOffset.height()) + shadowRadius); |
| shadowOffset -= m_extraOffset; |
| } |
| |
| if (!m_avoidDrawingShadow) |
| context.setShadow(shadowOffset, shadowRadius, shadowColor); |
| } |
| |
| ShadowApplier::~ShadowApplier() |
| { |
| if (!m_shadow) |
| return; |
| if (m_onlyDrawsShadow) |
| m_context.restore(); |
| else if (!m_avoidDrawingShadow) |
| m_context.clearShadow(); |
| } |
| |
| static void paintTextWithShadows(GraphicsContext& context, const FontCascade& font, const TextRun& textRun, const AtomicString& emphasisMark, |
| int emphasisMarkOffset, int startOffset, int endOffset, int truncationPoint, const FloatPoint& textOrigin, const FloatRect& boxRect, |
| const ShadowData* shadow, bool stroked, bool horizontal) |
| { |
| Color fillColor = context.fillColor(); |
| bool opaque = !fillColor.hasAlpha(); |
| bool lastShadowIterationShouldDrawText = !stroked && opaque; |
| if (!opaque) |
| context.setFillColor(Color::black); |
| |
| do { |
| ShadowApplier shadowApplier(context, shadow, boxRect, lastShadowIterationShouldDrawText, opaque, horizontal ? Horizontal : Vertical); |
| if (shadowApplier.nothingToDraw()) { |
| shadow = shadow->next(); |
| continue; |
| } |
| |
| IntSize extraOffset = roundedIntSize(shadowApplier.extraOffset()); |
| if (!shadow && !opaque) |
| context.setFillColor(fillColor); |
| |
| if (startOffset <= endOffset) |
| drawTextOrEmphasisMarks(context, font, textRun, emphasisMark, emphasisMarkOffset, textOrigin + extraOffset, startOffset, endOffset); |
| else { |
| if (endOffset > 0) |
| drawTextOrEmphasisMarks(context, font, textRun, emphasisMark, emphasisMarkOffset, textOrigin + extraOffset, 0, endOffset); |
| if (startOffset < truncationPoint) |
| drawTextOrEmphasisMarks(context, font, textRun, emphasisMark, emphasisMarkOffset, textOrigin + extraOffset, startOffset, truncationPoint); |
| } |
| |
| if (!shadow) |
| break; |
| |
| shadow = shadow->next(); |
| } while (shadow || !lastShadowIterationShouldDrawText); |
| } |
| |
| void TextPainter::paintText() |
| { |
| FloatPoint boxOrigin = m_boxRect.location(); |
| |
| if (!m_paintSelectedTextOnly) { |
| // For stroked painting, we have to change the text drawing mode. It's probably dangerous to leave that mutated as a side |
| // effect, so only when we know we're stroking, do a save/restore. |
| GraphicsContextStateSaver stateSaver(m_context, m_textPaintStyle.strokeWidth > 0); |
| |
| updateGraphicsContext(m_context, m_textPaintStyle); |
| if (!m_paintSelectedTextSeparately || m_endPositionInTextRun <= m_startPositionInTextRun) { |
| // FIXME: Truncate right-to-left text correctly. |
| paintTextWithShadows(m_context, m_font, m_textRun, nullAtom, 0, 0, m_length, m_length, m_textOrigin, m_boxRect, m_textShadow, m_textPaintStyle.strokeWidth > 0, m_textBoxIsHorizontal); |
| } else |
| paintTextWithShadows(m_context, m_font, m_textRun, nullAtom, 0, m_endPositionInTextRun, m_startPositionInTextRun, m_length, m_textOrigin, m_boxRect, m_textShadow, m_textPaintStyle.strokeWidth > 0, m_textBoxIsHorizontal); |
| |
| if (!m_emphasisMark.isEmpty()) { |
| updateGraphicsContext(m_context, m_textPaintStyle, UseEmphasisMarkColor); |
| |
| static NeverDestroyed<TextRun> objectReplacementCharacterTextRun(StringView(&objectReplacementCharacter, 1)); |
| TextRun& emphasisMarkTextRun = m_combinedText ? objectReplacementCharacterTextRun.get() : m_textRun; |
| FloatPoint emphasisMarkTextOrigin = m_combinedText ? FloatPoint(boxOrigin.x() + m_boxRect.width() / 2, boxOrigin.y() + m_font.fontMetrics().ascent()) : m_textOrigin; |
| if (m_combinedText) |
| m_context.concatCTM(rotation(m_boxRect, Clockwise)); |
| |
| if (!m_paintSelectedTextSeparately || m_endPositionInTextRun <= m_startPositionInTextRun) { |
| // FIXME: Truncate right-to-left text correctly. |
| paintTextWithShadows(m_context, m_combinedText ? m_combinedText->originalFont() : m_font, emphasisMarkTextRun, m_emphasisMark, m_emphasisMarkOffset, 0, m_length, m_length, emphasisMarkTextOrigin, m_boxRect, m_textShadow, m_textPaintStyle.strokeWidth > 0, m_textBoxIsHorizontal); |
| } else |
| paintTextWithShadows(m_context, m_combinedText ? m_combinedText->originalFont() : m_font, emphasisMarkTextRun, m_emphasisMark, m_emphasisMarkOffset, m_endPositionInTextRun, m_startPositionInTextRun, m_length, emphasisMarkTextOrigin, m_boxRect, m_textShadow, m_textPaintStyle.strokeWidth > 0, m_textBoxIsHorizontal); |
| |
| if (m_combinedText) |
| m_context.concatCTM(rotation(m_boxRect, Counterclockwise)); |
| } |
| } |
| |
| if ((m_paintSelectedTextOnly || m_paintSelectedTextSeparately) && m_startPositionInTextRun < m_endPositionInTextRun) { |
| // paint only the text that is selected |
| GraphicsContextStateSaver stateSaver(m_context, m_selectionPaintStyle.strokeWidth > 0); |
| |
| updateGraphicsContext(m_context, m_selectionPaintStyle); |
| paintTextWithShadows(m_context, m_font, m_textRun, nullAtom, 0, m_startPositionInTextRun, m_endPositionInTextRun, m_length, m_textOrigin, m_boxRect, m_selectionShadow, m_selectionPaintStyle.strokeWidth > 0, m_textBoxIsHorizontal); |
| if (!m_emphasisMark.isEmpty()) { |
| updateGraphicsContext(m_context, m_selectionPaintStyle, UseEmphasisMarkColor); |
| |
| DEPRECATED_DEFINE_STATIC_LOCAL(TextRun, objectReplacementCharacterTextRun, (StringView(&objectReplacementCharacter, 1))); |
| TextRun& emphasisMarkTextRun = m_combinedText ? objectReplacementCharacterTextRun : m_textRun; |
| FloatPoint emphasisMarkTextOrigin = m_combinedText ? FloatPoint(boxOrigin.x() + m_boxRect.width() / 2, boxOrigin.y() + m_font.fontMetrics().ascent()) : m_textOrigin; |
| if (m_combinedText) |
| m_context.concatCTM(rotation(m_boxRect, Clockwise)); |
| |
| paintTextWithShadows(m_context, m_combinedText ? m_combinedText->originalFont() : m_font, emphasisMarkTextRun, m_emphasisMark, m_emphasisMarkOffset, m_startPositionInTextRun, m_endPositionInTextRun, m_length, emphasisMarkTextOrigin, m_boxRect, m_selectionShadow, m_selectionPaintStyle.strokeWidth > 0, m_textBoxIsHorizontal); |
| |
| if (m_combinedText) |
| m_context.concatCTM(rotation(m_boxRect, Counterclockwise)); |
| } |
| } |
| } |
| |
| #if ENABLE(CSS3_TEXT_DECORATION_SKIP_INK) |
| DashArray TextPainter::dashesForIntersectionsWithRect(const FloatRect& lineExtents) |
| { |
| return m_font.dashesForIntersectionsWithRect(m_textRun, m_textOrigin, lineExtents); |
| } |
| #endif |
| |
| } // namespace WebCore |
