| /* |
| * Copyright (C) 2000 Lars Knoll (knoll@kde.org) |
| * (C) 2000 Antti Koivisto (koivisto@kde.org) |
| * (C) 2000 Dirk Mueller (mueller@kde.org) |
| * Copyright (C) 2003, 2006, 2007, 2011 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. |
| * |
| */ |
| |
| #ifndef TextRun_h |
| #define TextRun_h |
| |
| #include "TextFlags.h" |
| #include "WritingMode.h" |
| #include <wtf/RefCounted.h> |
| #include <wtf/text/StringView.h> |
| |
| namespace WebCore { |
| |
| class FloatPoint; |
| class FloatRect; |
| class FontCascade; |
| class GraphicsContext; |
| class GlyphBuffer; |
| class GlyphToPathTranslator; |
| class Font; |
| |
| struct GlyphData; |
| struct WidthIterator; |
| |
| class TextRun { |
| WTF_MAKE_FAST_ALLOCATED; |
| public: |
| explicit TextRun(StringView text, float xpos = 0, float expansion = 0, ExpansionBehavior expansionBehavior = AllowTrailingExpansion | ForbidLeadingExpansion, TextDirection direction = LTR, bool directionalOverride = false, bool characterScanForCodePath = true) |
| : m_text(text) |
| , m_charactersLength(text.length()) |
| , m_tabSize(0) |
| , m_xpos(xpos) |
| , m_horizontalGlyphStretch(1) |
| , m_expansion(expansion) |
| , m_expansionBehavior(expansionBehavior) |
| , m_allowTabs(false) |
| , m_direction(direction) |
| , m_directionalOverride(directionalOverride) |
| , m_characterScanForCodePath(characterScanForCodePath) |
| , m_disableSpacing(false) |
| { |
| } |
| |
| TextRun subRun(unsigned startOffset, unsigned length) const |
| { |
| ASSERT_WITH_SECURITY_IMPLICATION(startOffset < m_text.length()); |
| |
| TextRun result = *this; |
| |
| if (is8Bit()) { |
| result.setText(data8(startOffset), length); |
| return result; |
| } |
| result.setText(data16(startOffset), length); |
| return result; |
| } |
| |
| UChar operator[](unsigned i) const { ASSERT_WITH_SECURITY_IMPLICATION(i < m_text.length()); return m_text[i]; } |
| const LChar* data8(unsigned i) const { ASSERT_WITH_SECURITY_IMPLICATION(i < m_text.length()); ASSERT(is8Bit()); return &m_text.characters8()[i]; } |
| const UChar* data16(unsigned i) const { ASSERT_WITH_SECURITY_IMPLICATION(i < m_text.length()); ASSERT(!is8Bit()); return &m_text.characters16()[i]; } |
| |
| const LChar* characters8() const { ASSERT(is8Bit()); return m_text.characters8(); } |
| const UChar* characters16() const { ASSERT(!is8Bit()); return m_text.characters16(); } |
| |
| bool is8Bit() const { return m_text.is8Bit(); } |
| unsigned length() const { return m_text.length(); } |
| unsigned charactersLength() const { return m_charactersLength; } |
| String string() const { return m_text.toString(); } |
| |
| void setText(const LChar* c, unsigned len) { m_text = StringView(c, len); } |
| void setText(const UChar* c, unsigned len) { m_text = StringView(c, len); } |
| void setText(StringView stringView) { m_text = stringView; } |
| void setCharactersLength(unsigned charactersLength) { m_charactersLength = charactersLength; } |
| |
| float horizontalGlyphStretch() const { return m_horizontalGlyphStretch; } |
| void setHorizontalGlyphStretch(float scale) { m_horizontalGlyphStretch = scale; } |
| |
| bool allowTabs() const { return m_allowTabs; } |
| unsigned tabSize() const { return m_tabSize; } |
| void setTabSize(bool, unsigned); |
| |
| float xPos() const { return m_xpos; } |
| void setXPos(float xPos) { m_xpos = xPos; } |
| float expansion() const { return m_expansion; } |
| ExpansionBehavior expansionBehavior() const { return m_expansionBehavior; } |
| TextDirection direction() const { return static_cast<TextDirection>(m_direction); } |
| bool rtl() const { return m_direction == RTL; } |
| bool ltr() const { return m_direction == LTR; } |
| bool directionalOverride() const { return m_directionalOverride; } |
| bool characterScanForCodePath() const { return m_characterScanForCodePath; } |
| bool spacingDisabled() const { return m_disableSpacing; } |
| |
| void disableSpacing() { m_disableSpacing = true; } |
| void setDirection(TextDirection direction) { m_direction = direction; } |
| void setDirectionalOverride(bool override) { m_directionalOverride = override; } |
| void setCharacterScanForCodePath(bool scan) { m_characterScanForCodePath = scan; } |
| StringView text() const { return m_text; } |
| |
| class RenderingContext : public RefCounted<RenderingContext> { |
| public: |
| virtual ~RenderingContext() { } |
| |
| #if ENABLE(SVG_FONTS) |
| virtual GlyphData glyphDataForCharacter(const FontCascade&, WidthIterator&, UChar32 character, bool mirror, int currentCharacter, unsigned& advanceLength, String& normalizedSpacesStringCache) = 0; |
| virtual void drawSVGGlyphs(GraphicsContext&, const Font&, const GlyphBuffer&, int from, int to, const FloatPoint&) const = 0; |
| virtual float floatWidthUsingSVGFont(const FontCascade&, const TextRun&, int& charsConsumed, String& glyphName) const = 0; |
| virtual bool applySVGKerning(const Font*, WidthIterator&, GlyphBuffer*, int from) const = 0; |
| virtual std::unique_ptr<GlyphToPathTranslator> createGlyphToPathTranslator(const Font&, const TextRun*, const GlyphBuffer&, int from, int numGlyphs, const FloatPoint&) const = 0; |
| #endif |
| }; |
| |
| RenderingContext* renderingContext() const { return m_renderingContext.get(); } |
| void setRenderingContext(PassRefPtr<RenderingContext> context) { m_renderingContext = context; } |
| |
| private: |
| RefPtr<RenderingContext> m_renderingContext; |
| |
| StringView m_text; |
| unsigned m_charactersLength; // Marks the end of the characters buffer. Default equals to length of m_text. |
| |
| unsigned m_tabSize; |
| |
| // m_xpos is the x position relative to the left start of the text line, not relative to the left |
| // start of the containing block. In the case of right alignment or center alignment, left start of |
| // the text line is not the same as left start of the containing block. This variable is only used |
| // to calculate the width of \t |
| float m_xpos; |
| float m_horizontalGlyphStretch; |
| |
| float m_expansion; |
| unsigned m_expansionBehavior : 4; |
| unsigned m_allowTabs : 1; |
| unsigned m_direction : 1; |
| unsigned m_directionalOverride : 1; // Was this direction set by an override character. |
| unsigned m_characterScanForCodePath : 1; |
| unsigned m_disableSpacing : 1; |
| }; |
| |
| inline void TextRun::setTabSize(bool allow, unsigned size) |
| { |
| m_allowTabs = allow; |
| m_tabSize = size; |
| } |
| |
| } |
| |
| #endif |