author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 11 May 2010 17:13:44 +0300 | |
branch | RCL_3 |
changeset 70 | 8bfb9186a8b8 |
parent 0 | dd21522fd290 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (C) 2006, 2007 Apple Inc. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
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* its contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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|
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#include "config.h" |
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#include "GlyphPageTreeNode.h" |
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|
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#include "CharacterNames.h" |
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#include "FontData.h" |
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#include <wtf/unicode/Unicode.h> |
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|
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namespace WebCore { |
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|
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GlyphPageTreeNode* GlyphPageTreeNode::getRoot(unsigned pageNumber) |
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{ |
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static HashMap<int, GlyphPageTreeNode*> roots; |
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static GlyphPageTreeNode* pageZeroRoot; |
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GlyphPageTreeNode* node = pageNumber ? roots.get(pageNumber) : pageZeroRoot; |
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if (!node) { |
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node = new GlyphPageTreeNode; |
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#ifndef NDEBUG |
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node->m_pageNumber = pageNumber; |
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#endif |
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if (pageNumber) |
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roots.set(pageNumber, node); |
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else |
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pageZeroRoot = node; |
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} |
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return node; |
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} |
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void GlyphPageTreeNode::initializePage(const FontData* fontData, unsigned pageNumber) |
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{ |
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ASSERT(!m_page); |
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// This function must not be called for the root of the tree, because that |
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// level does not contain any glyphs. |
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ASSERT(m_level > 0 && m_parent); |
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|
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// The parent's page will be 0 if we are level one or the parent's font data |
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// did not contain any glyphs for that page. |
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GlyphPage* parentPage = m_parent->m_page; |
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|
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// NULL FontData means we're being asked for the system fallback font. |
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if (fontData) { |
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if (m_level == 1) { |
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// Children of the root hold pure pages. These will cover only one |
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// font data's glyphs, and will have glyph index 0 if the font data does not |
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// contain the glyph. |
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unsigned start = pageNumber * GlyphPage::size; |
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UChar buffer[GlyphPage::size * 2 + 2]; |
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unsigned bufferLength; |
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unsigned i; |
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|
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// Fill in a buffer with the entire "page" of characters that we want to look up glyphs for. |
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if (start < 0x10000) { |
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bufferLength = GlyphPage::size; |
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for (i = 0; i < GlyphPage::size; i++) |
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buffer[i] = start + i; |
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|
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if (start == 0) { |
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// Control characters must not render at all. |
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for (i = 0; i < 0x20; ++i) |
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buffer[i] = zeroWidthSpace; |
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for (i = 0x7F; i < 0xA0; i++) |
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buffer[i] = zeroWidthSpace; |
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|
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// \n, \t, and nonbreaking space must render as a space. |
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buffer[(int)'\n'] = ' '; |
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buffer[(int)'\t'] = ' '; |
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buffer[noBreakSpace] = ' '; |
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} else if (start == (leftToRightMark & ~(GlyphPage::size - 1))) { |
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// LRM/RLM must not render at all. |
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buffer[leftToRightMark - start] = zeroWidthSpace; |
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buffer[rightToLeftMark - start] = zeroWidthSpace; |
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} else if (start == (objectReplacementCharacter & ~(GlyphPage::size - 1))) { |
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// Object replacement character must not render at all. |
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buffer[objectReplacementCharacter - start] = zeroWidthSpace; |
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} |
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} else { |
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bufferLength = GlyphPage::size * 2; |
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106 |
for (i = 0; i < GlyphPage::size; i++) { |
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107 |
int c = i + start; |
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108 |
buffer[i * 2] = U16_LEAD(c); |
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109 |
buffer[i * 2 + 1] = U16_TRAIL(c); |
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110 |
} |
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111 |
} |
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112 |
|
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113 |
m_page = new GlyphPage(this); |
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114 |
|
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115 |
// Now that we have a buffer full of characters, we want to get back an array |
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116 |
// of glyph indices. This part involves calling into the platform-specific |
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117 |
// routine of our glyph map for actually filling in the page with the glyphs. |
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118 |
// Success is not guaranteed. For example, Times fails to fill page 260, giving glyph data |
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119 |
// for only 128 out of 256 characters. |
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120 |
bool haveGlyphs = m_page->fill(buffer, bufferLength, fontData); |
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121 |
|
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122 |
if (!haveGlyphs) { |
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123 |
delete m_page; |
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124 |
m_page = 0; |
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125 |
} |
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126 |
} else if (parentPage && parentPage->owner() != m_parent) { |
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127 |
// The page we're overriding may not be owned by our parent node. |
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128 |
// This happens when our parent node provides no useful overrides |
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129 |
// and just copies the pointer to an already-existing page (see |
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130 |
// below). |
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131 |
// |
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132 |
// We want our override to be shared by all nodes that reference |
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133 |
// that page to avoid duplication, and so standardize on having the |
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134 |
// page's owner collect all the overrides. Call getChild on the |
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135 |
// page owner with the desired font data (this will populate |
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136 |
// the page) and then reference it. |
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137 |
m_page = parentPage->owner()->getChild(fontData, pageNumber)->page(); |
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138 |
} else { |
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139 |
// Get the pure page for the fallback font (at level 1 with no |
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140 |
// overrides). getRootChild will always create a page if one |
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141 |
// doesn't exist, but the page doesn't necessarily have glyphs |
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142 |
// (this pointer may be 0). |
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143 |
GlyphPage* fallbackPage = getRootChild(fontData, pageNumber)->page(); |
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144 |
if (!parentPage) { |
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145 |
// When the parent has no glyphs for this page, we can easily |
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146 |
// override it just by supplying the glyphs from our font. |
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147 |
m_page = fallbackPage; |
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148 |
} else if (!fallbackPage) { |
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149 |
// When our font has no glyphs for this page, we can just reference the |
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150 |
// parent page. |
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151 |
m_page = parentPage; |
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152 |
} else { |
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153 |
// Combine the parent's glyphs and ours to form a new more complete page. |
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154 |
m_page = new GlyphPage(this); |
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155 |
|
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156 |
// Overlay the parent page on the fallback page. Check if the fallback font |
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157 |
// has added anything. |
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158 |
bool newGlyphs = false; |
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159 |
for (unsigned i = 0; i < GlyphPage::size; i++) { |
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160 |
if (parentPage->m_glyphs[i].glyph) |
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161 |
m_page->m_glyphs[i] = parentPage->m_glyphs[i]; |
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162 |
else if (fallbackPage->m_glyphs[i].glyph) { |
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163 |
m_page->m_glyphs[i] = fallbackPage->m_glyphs[i]; |
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164 |
newGlyphs = true; |
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165 |
} else { |
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166 |
const GlyphData data = { 0, 0 }; |
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167 |
m_page->m_glyphs[i] = data; |
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168 |
} |
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169 |
} |
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170 |
|
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|
171 |
if (!newGlyphs) { |
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172 |
// We didn't override anything, so our override is just the parent page. |
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173 |
delete m_page; |
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174 |
m_page = parentPage; |
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|
175 |
} |
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176 |
} |
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177 |
} |
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178 |
} else { |
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179 |
m_page = new GlyphPage(this); |
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180 |
// System fallback. Initialized with the parent's page here, as individual |
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181 |
// entries may use different fonts depending on character. If the Font |
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182 |
// ever finds it needs a glyph out of the system fallback page, it will |
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183 |
// ask the system for the best font to use and fill that glyph in for us. |
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184 |
if (parentPage) |
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185 |
memcpy(m_page->m_glyphs, parentPage->m_glyphs, GlyphPage::size * sizeof(m_page->m_glyphs[0])); |
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|
186 |
else { |
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187 |
const GlyphData data = { 0, 0 }; |
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188 |
for (unsigned i = 0; i < GlyphPage::size; i++) |
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189 |
m_page->m_glyphs[i] = data; |
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190 |
} |
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191 |
} |
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|
192 |
} |
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193 |
|
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194 |
GlyphPageTreeNode* GlyphPageTreeNode::getChild(const FontData* fontData, unsigned pageNumber) |
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195 |
{ |
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196 |
ASSERT(fontData || !m_isSystemFallback); |
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197 |
ASSERT(pageNumber == m_pageNumber); |
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198 |
|
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199 |
GlyphPageTreeNode* child = fontData ? m_children.get(fontData) : m_systemFallbackChild; |
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200 |
if (!child) { |
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201 |
child = new GlyphPageTreeNode; |
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202 |
child->m_parent = this; |
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203 |
child->m_level = m_level + 1; |
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|
204 |
#ifndef NDEBUG |
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205 |
child->m_pageNumber = m_pageNumber; |
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206 |
#endif |
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207 |
if (fontData) |
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208 |
m_children.set(fontData, child); |
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209 |
else { |
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210 |
m_systemFallbackChild = child; |
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211 |
child->m_isSystemFallback = true; |
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Revision: 200911
Kiiskinen Klaus (Nokia-D-MSW/Tampere) <klaus.kiiskinen@nokia.com>
parents:
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} |
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Revision: 200911
Kiiskinen Klaus (Nokia-D-MSW/Tampere) <klaus.kiiskinen@nokia.com>
parents:
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child->initializePage(fontData, pageNumber); |
dd21522fd290
Revision: 200911
Kiiskinen Klaus (Nokia-D-MSW/Tampere) <klaus.kiiskinen@nokia.com>
parents:
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} |
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Revision: 200911
Kiiskinen Klaus (Nokia-D-MSW/Tampere) <klaus.kiiskinen@nokia.com>
parents:
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return child; |
dd21522fd290
Revision: 200911
Kiiskinen Klaus (Nokia-D-MSW/Tampere) <klaus.kiiskinen@nokia.com>
parents:
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} |
dd21522fd290
Revision: 200911
Kiiskinen Klaus (Nokia-D-MSW/Tampere) <klaus.kiiskinen@nokia.com>
parents:
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|
dd21522fd290
Revision: 200911
Kiiskinen Klaus (Nokia-D-MSW/Tampere) <klaus.kiiskinen@nokia.com>
parents:
diff
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} |