| /* |
| * 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 "platform/PlatformExport.h" |
| #include "platform/fonts/Glyph.h" |
| #include "platform/geometry/FloatRect.h" |
| #include "platform/text/TextDirection.h" |
| #include "platform/text/TextPath.h" |
| #include "wtf/RefCounted.h" |
| #include "wtf/text/WTFString.h" |
| |
| namespace blink { |
| |
| class FloatPoint; |
| class Font; |
| class GraphicsContext; |
| class GlyphBuffer; |
| class SimpleFontData; |
| struct GlyphData; |
| struct WidthIterator; |
| |
| class PLATFORM_EXPORT TextRun { |
| WTF_MAKE_FAST_ALLOCATED; |
| public: |
| enum ExpansionBehaviorFlags { |
| ForbidTrailingExpansion = 0 << 0, |
| AllowTrailingExpansion = 1 << 0, |
| ForbidLeadingExpansion = 0 << 1, |
| AllowLeadingExpansion = 1 << 1, |
| }; |
| |
| typedef unsigned ExpansionBehavior; |
| |
| TextRun(const LChar* c, unsigned len, float xpos = 0, float expansion = 0, ExpansionBehavior expansionBehavior = AllowTrailingExpansion | ForbidLeadingExpansion, TextDirection direction = LTR, bool directionalOverride = false, bool characterScanForCodePath = true) |
| : m_charactersLength(len) |
| , m_len(len) |
| , m_xpos(xpos) |
| , m_horizontalGlyphStretch(1) |
| , m_expansion(expansion) |
| , m_expansionBehavior(expansionBehavior) |
| , m_is8Bit(true) |
| , m_allowTabs(false) |
| , m_direction(direction) |
| , m_directionalOverride(directionalOverride) |
| , m_characterScanForCodePath(characterScanForCodePath) |
| , m_disableSpacing(false) |
| , m_tabSize(0) |
| { |
| m_data.characters8 = c; |
| } |
| |
| TextRun(const UChar* c, unsigned len, float xpos = 0, float expansion = 0, ExpansionBehavior expansionBehavior = AllowTrailingExpansion | ForbidLeadingExpansion, TextDirection direction = LTR, bool directionalOverride = false, bool characterScanForCodePath = true) |
| : m_charactersLength(len) |
| , m_len(len) |
| , m_xpos(xpos) |
| , m_horizontalGlyphStretch(1) |
| , m_expansion(expansion) |
| , m_expansionBehavior(expansionBehavior) |
| , m_is8Bit(false) |
| , m_allowTabs(false) |
| , m_direction(direction) |
| , m_directionalOverride(directionalOverride) |
| , m_characterScanForCodePath(characterScanForCodePath) |
| , m_disableSpacing(false) |
| , m_tabSize(0) |
| { |
| m_data.characters16 = c; |
| } |
| |
| TextRun(const String& string, float xpos = 0, float expansion = 0, ExpansionBehavior expansionBehavior = AllowTrailingExpansion | ForbidLeadingExpansion, TextDirection direction = LTR, bool directionalOverride = false, bool characterScanForCodePath = true) |
| : m_charactersLength(string.length()) |
| , m_len(string.length()) |
| , 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) |
| , m_tabSize(0) |
| { |
| if (!m_charactersLength) { |
| m_is8Bit = true; |
| m_data.characters8 = 0; |
| } else if (string.is8Bit()) { |
| m_data.characters8 = string.characters8(); |
| m_is8Bit = true; |
| } else { |
| m_data.characters16 = string.characters16(); |
| m_is8Bit = false; |
| } |
| } |
| |
| TextRun(const StringView& string, float xpos = 0, float expansion = 0, ExpansionBehavior expansionBehavior = AllowTrailingExpansion | ForbidLeadingExpansion, TextDirection direction = LTR, bool directionalOverride = false, bool characterScanForCodePath = true) |
| : m_charactersLength(string.length()) |
| , m_len(string.length()) |
| , 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) |
| , m_tabSize(0) |
| { |
| if (!m_charactersLength) { |
| m_is8Bit = true; |
| m_data.characters8 = 0; |
| } else if (string.is8Bit()) { |
| m_data.characters8 = string.characters8(); |
| m_is8Bit = true; |
| } else { |
| m_data.characters16 = string.characters16(); |
| m_is8Bit = false; |
| } |
| } |
| |
| TextRun subRun(unsigned startOffset, unsigned length) const |
| { |
| ASSERT(startOffset < m_len); |
| |
| 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_len); return is8Bit() ? m_data.characters8[i] :m_data.characters16[i]; } |
| const LChar* data8(unsigned i) const { ASSERT_WITH_SECURITY_IMPLICATION(i < m_len); ASSERT(is8Bit()); return &m_data.characters8[i]; } |
| const UChar* data16(unsigned i) const { ASSERT_WITH_SECURITY_IMPLICATION(i < m_len); ASSERT(!is8Bit()); return &m_data.characters16[i]; } |
| |
| const LChar* characters8() const { ASSERT(is8Bit()); return m_data.characters8; } |
| const UChar* characters16() const { ASSERT(!is8Bit()); return m_data.characters16; } |
| |
| bool is8Bit() const { return m_is8Bit; } |
| int length() const { return m_len; } |
| int charactersLength() const { return m_charactersLength; } |
| |
| void setText(const LChar* c, unsigned len) { m_data.characters8 = c; m_len = len; m_is8Bit = true;} |
| void setText(const UChar* c, unsigned len) { m_data.characters16 = c; m_len = len; m_is8Bit = false;} |
| void setText(const String&); |
| 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; } |
| bool allowsLeadingExpansion() const { return m_expansionBehavior & AllowLeadingExpansion; } |
| bool allowsTrailingExpansion() const { return m_expansionBehavior & AllowTrailingExpansion; } |
| 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; } |
| |
| class RenderingContext : public RefCounted<RenderingContext> { |
| public: |
| virtual ~RenderingContext() { } |
| |
| virtual GlyphData glyphDataForCharacter(const Font&, const TextRun&, WidthIterator&, UChar32 character, bool mirror, int currentCharacter, unsigned& advanceLength) = 0; |
| virtual void drawSVGGlyphs(GraphicsContext*, const TextRun&, const SimpleFontData*, const GlyphBuffer&, int from, int to, const FloatPoint&) const = 0; |
| virtual float floatWidthUsingSVGFont(const Font&, const TextRun&, int& charsConsumed, Glyph& glyphId) const = 0; |
| }; |
| |
| RenderingContext* renderingContext() const { return m_renderingContext.get(); } |
| void setRenderingContext(PassRefPtr<RenderingContext> context) { m_renderingContext = context; } |
| |
| private: |
| union { |
| const LChar* characters8; |
| const UChar* characters16; |
| } m_data; |
| unsigned m_charactersLength; // Marks the end of the characters buffer. Default equals to m_len. |
| unsigned m_len; |
| |
| // 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. |
| float m_xpos; |
| float m_horizontalGlyphStretch; |
| |
| float m_expansion; |
| ExpansionBehavior m_expansionBehavior : 2; |
| unsigned m_is8Bit : 1; |
| 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; |
| unsigned m_tabSize; |
| RefPtr<RenderingContext> m_renderingContext; |
| }; |
| |
| inline void TextRun::setTabSize(bool allow, unsigned size) |
| { |
| m_allowTabs = allow; |
| m_tabSize = size; |
| } |
| |
| // Container for parameters needed to paint TextRun. |
| struct TextRunPaintInfo { |
| explicit TextRunPaintInfo(const TextRun& r) |
| : run(r) |
| , from(0) |
| , to(r.length()) |
| { |
| } |
| |
| const TextRun& run; |
| int from; |
| int to; |
| FloatRect bounds; |
| }; |
| |
| } |
| #endif |
