diff options
author | Steve Block <steveblock@google.com> | 2011-05-06 11:45:16 +0100 |
---|---|---|
committer | Steve Block <steveblock@google.com> | 2011-05-12 13:44:10 +0100 |
commit | cad810f21b803229eb11403f9209855525a25d57 (patch) | |
tree | 29a6fd0279be608e0fe9ffe9841f722f0f4e4269 /WebCore/platform/graphics/GlyphPageTreeNode.cpp | |
parent | 121b0cf4517156d0ac5111caf9830c51b69bae8f (diff) | |
download | external_webkit-cad810f21b803229eb11403f9209855525a25d57.zip external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.gz external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.bz2 |
Merge WebKit at r75315: Initial merge by git.
Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
Diffstat (limited to 'WebCore/platform/graphics/GlyphPageTreeNode.cpp')
-rw-r--r-- | WebCore/platform/graphics/GlyphPageTreeNode.cpp | 437 |
1 files changed, 0 insertions, 437 deletions
diff --git a/WebCore/platform/graphics/GlyphPageTreeNode.cpp b/WebCore/platform/graphics/GlyphPageTreeNode.cpp deleted file mode 100644 index 3df14b9..0000000 --- a/WebCore/platform/graphics/GlyphPageTreeNode.cpp +++ /dev/null @@ -1,437 +0,0 @@ -/* - * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of - * its contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY - * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE - * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY - * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES - * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; - * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND - * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF - * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include "config.h" -#include "GlyphPageTreeNode.h" - -#include "CharacterNames.h" -#include "PlatformString.h" -#include "SegmentedFontData.h" -#include "SimpleFontData.h" -#include <stdio.h> -#include <wtf/text/CString.h> -#include <wtf/unicode/Unicode.h> - -namespace WebCore { - -using std::max; -using std::min; - -HashMap<int, GlyphPageTreeNode*>* GlyphPageTreeNode::roots = 0; -GlyphPageTreeNode* GlyphPageTreeNode::pageZeroRoot = 0; - -GlyphPageTreeNode* GlyphPageTreeNode::getRoot(unsigned pageNumber) -{ - static bool initialized; - if (!initialized) { - initialized = true; - roots = new HashMap<int, GlyphPageTreeNode*>; - pageZeroRoot = new GlyphPageTreeNode; - } - - GlyphPageTreeNode* node = pageNumber ? roots->get(pageNumber) : pageZeroRoot; - if (!node) { - node = new GlyphPageTreeNode; -#ifndef NDEBUG - node->m_pageNumber = pageNumber; -#endif - if (pageNumber) - roots->set(pageNumber, node); - else - pageZeroRoot = node; - } - return node; -} - -size_t GlyphPageTreeNode::treeGlyphPageCount() -{ - size_t count = 0; - if (roots) { - HashMap<int, GlyphPageTreeNode*>::iterator end = roots->end(); - for (HashMap<int, GlyphPageTreeNode*>::iterator it = roots->begin(); it != end; ++it) - count += it->second->pageCount(); - } - - if (pageZeroRoot) - count += pageZeroRoot->pageCount(); - - return count; -} - -size_t GlyphPageTreeNode::pageCount() const -{ - size_t count = m_page && m_page->owner() == this ? 1 : 0; - HashMap<const FontData*, GlyphPageTreeNode*>::const_iterator end = m_children.end(); - for (HashMap<const FontData*, GlyphPageTreeNode*>::const_iterator it = m_children.begin(); it != end; ++it) - count += it->second->pageCount(); - - return count; -} - -void GlyphPageTreeNode::pruneTreeCustomFontData(const FontData* fontData) -{ - // Enumerate all the roots and prune any tree that contains our custom font data. - if (roots) { - HashMap<int, GlyphPageTreeNode*>::iterator end = roots->end(); - for (HashMap<int, GlyphPageTreeNode*>::iterator it = roots->begin(); it != end; ++it) - it->second->pruneCustomFontData(fontData); - } - - if (pageZeroRoot) - pageZeroRoot->pruneCustomFontData(fontData); -} - -void GlyphPageTreeNode::pruneTreeFontData(const SimpleFontData* fontData) -{ - if (roots) { - HashMap<int, GlyphPageTreeNode*>::iterator end = roots->end(); - for (HashMap<int, GlyphPageTreeNode*>::iterator it = roots->begin(); it != end; ++it) - it->second->pruneFontData(fontData); - } - - if (pageZeroRoot) - pageZeroRoot->pruneFontData(fontData); -} - -GlyphPageTreeNode::~GlyphPageTreeNode() -{ - deleteAllValues(m_children); - delete m_systemFallbackChild; -} - -static bool fill(GlyphPage* pageToFill, unsigned offset, unsigned length, UChar* buffer, unsigned bufferLength, const SimpleFontData* fontData) -{ - if (!fontData->isSVGFont()) - return pageToFill->fill(offset, length, buffer, bufferLength, fontData); - - // SVG Fonts do not use the glyph page cache. Zero fill the glyph - // positions and return false to indicate the glyphs were not found. - for (unsigned i = 0; i < length; ++i) - pageToFill->setGlyphDataForIndex(offset + i, 0, 0); - return false; -} - -void GlyphPageTreeNode::initializePage(const FontData* fontData, unsigned pageNumber) -{ - ASSERT(!m_page); - - // This function must not be called for the root of the tree, because that - // level does not contain any glyphs. - ASSERT(m_level > 0 && m_parent); - - // The parent's page will be 0 if we are level one or the parent's font data - // did not contain any glyphs for that page. - GlyphPage* parentPage = m_parent->page(); - - // NULL FontData means we're being asked for the system fallback font. - if (fontData) { - if (m_level == 1) { - // Children of the root hold pure pages. These will cover only one - // font data's glyphs, and will have glyph index 0 if the font data does not - // contain the glyph. - unsigned start = pageNumber * GlyphPage::size; - UChar buffer[GlyphPage::size * 2 + 2]; - unsigned bufferLength; - unsigned i; - - // Fill in a buffer with the entire "page" of characters that we want to look up glyphs for. - if (start < 0x10000) { - bufferLength = GlyphPage::size; - for (i = 0; i < GlyphPage::size; i++) - buffer[i] = start + i; - - if (start == 0) { - // Control characters must not render at all. - for (i = 0; i < 0x20; ++i) - buffer[i] = zeroWidthSpace; - for (i = 0x7F; i < 0xA0; i++) - buffer[i] = zeroWidthSpace; - buffer[softHyphen] = zeroWidthSpace; - - // \n, \t, and nonbreaking space must render as a space. - buffer[(int)'\n'] = ' '; - buffer[(int)'\t'] = ' '; - buffer[noBreakSpace] = ' '; - } else if (start == (leftToRightMark & ~(GlyphPage::size - 1))) { - // LRM, RLM, LRE, RLE, ZWNJ, ZWJ, and PDF must not render at all. - buffer[leftToRightMark - start] = zeroWidthSpace; - buffer[rightToLeftMark - start] = zeroWidthSpace; - buffer[leftToRightEmbed - start] = zeroWidthSpace; - buffer[rightToLeftEmbed - start] = zeroWidthSpace; - buffer[leftToRightOverride - start] = zeroWidthSpace; - buffer[rightToLeftOverride - start] = zeroWidthSpace; - buffer[zeroWidthNonJoiner - start] = zeroWidthSpace; - buffer[zeroWidthJoiner - start] = zeroWidthSpace; - buffer[popDirectionalFormatting - start] = zeroWidthSpace; - } else if (start == (objectReplacementCharacter & ~(GlyphPage::size - 1))) { - // Object replacement character must not render at all. - buffer[objectReplacementCharacter - start] = zeroWidthSpace; - } - } else { - bufferLength = GlyphPage::size * 2; - for (i = 0; i < GlyphPage::size; i++) { - int c = i + start; - buffer[i * 2] = U16_LEAD(c); - buffer[i * 2 + 1] = U16_TRAIL(c); - } - } - - m_page = GlyphPage::create(this); - - // Now that we have a buffer full of characters, we want to get back an array - // of glyph indices. This part involves calling into the platform-specific - // routine of our glyph map for actually filling in the page with the glyphs. - // Success is not guaranteed. For example, Times fails to fill page 260, giving glyph data - // for only 128 out of 256 characters. - bool haveGlyphs; - if (fontData->isSegmented()) { - haveGlyphs = false; - - const SegmentedFontData* segmentedFontData = static_cast<const SegmentedFontData*>(fontData); - unsigned numRanges = segmentedFontData->numRanges(); - bool zeroFilled = false; - RefPtr<GlyphPage> scratchPage; - GlyphPage* pageToFill = m_page.get(); - for (unsigned i = 0; i < numRanges; i++) { - const FontDataRange& range = segmentedFontData->rangeAt(i); - // all this casting is to ensure all the parameters to min and max have the same type, - // to avoid ambiguous template parameter errors on Windows - int from = max(0, static_cast<int>(range.from()) - static_cast<int>(start)); - int to = 1 + min(static_cast<int>(range.to()) - static_cast<int>(start), static_cast<int>(GlyphPage::size) - 1); - if (from < static_cast<int>(GlyphPage::size) && to > 0) { - if (haveGlyphs && !scratchPage) { - scratchPage = GlyphPage::create(this); - pageToFill = scratchPage.get(); - } - - if (!zeroFilled) { - if (from > 0 || to < static_cast<int>(GlyphPage::size)) { - for (unsigned i = 0; i < GlyphPage::size; i++) - pageToFill->setGlyphDataForIndex(i, 0, 0); - } - zeroFilled = true; - } - haveGlyphs |= fill(pageToFill, from, to - from, buffer + from * (start < 0x10000 ? 1 : 2), (to - from) * (start < 0x10000 ? 1 : 2), range.fontData()); - if (scratchPage) { - ASSERT(to <= static_cast<int>(GlyphPage::size)); - for (int j = from; j < to; j++) { - if (!m_page->glyphAt(j) && pageToFill->glyphAt(j)) - m_page->setGlyphDataForIndex(j, pageToFill->glyphDataForIndex(j)); - } - } - } - } - } else - haveGlyphs = fill(m_page.get(), 0, GlyphPage::size, buffer, bufferLength, static_cast<const SimpleFontData*>(fontData)); - - if (!haveGlyphs) - m_page = 0; - } else if (parentPage && parentPage->owner() != m_parent) { - // The page we're overriding may not be owned by our parent node. - // This happens when our parent node provides no useful overrides - // and just copies the pointer to an already-existing page (see - // below). - // - // We want our override to be shared by all nodes that reference - // that page to avoid duplication, and so standardize on having the - // page's owner collect all the overrides. Call getChild on the - // page owner with the desired font data (this will populate - // the page) and then reference it. - m_page = parentPage->owner()->getChild(fontData, pageNumber)->page(); - } else { - // Get the pure page for the fallback font (at level 1 with no - // overrides). getRootChild will always create a page if one - // doesn't exist, but the page doesn't necessarily have glyphs - // (this pointer may be 0). - GlyphPage* fallbackPage = getRootChild(fontData, pageNumber)->page(); - if (!parentPage) { - // When the parent has no glyphs for this page, we can easily - // override it just by supplying the glyphs from our font. - m_page = fallbackPage; - } else if (!fallbackPage) { - // When our font has no glyphs for this page, we can just reference the - // parent page. - m_page = parentPage; - } else { - // Combine the parent's glyphs and ours to form a new more complete page. - m_page = GlyphPage::create(this); - - // Overlay the parent page on the fallback page. Check if the fallback font - // has added anything. - bool newGlyphs = false; - for (unsigned i = 0; i < GlyphPage::size; i++) { - if (parentPage->glyphAt(i)) - m_page->setGlyphDataForIndex(i, parentPage->glyphDataForIndex(i)); - else if (fallbackPage->glyphAt(i)) { - m_page->setGlyphDataForIndex(i, fallbackPage->glyphDataForIndex(i)); - newGlyphs = true; - } else - m_page->setGlyphDataForIndex(i, 0, 0); - } - - if (!newGlyphs) - // We didn't override anything, so our override is just the parent page. - m_page = parentPage; - } - } - } else { - m_page = GlyphPage::create(this); - // System fallback. Initialized with the parent's page here, as individual - // entries may use different fonts depending on character. If the Font - // ever finds it needs a glyph out of the system fallback page, it will - // ask the system for the best font to use and fill that glyph in for us. - if (parentPage) - m_page->copyFrom(*parentPage); - else - m_page->clear(); - } -} - -GlyphPageTreeNode* GlyphPageTreeNode::getChild(const FontData* fontData, unsigned pageNumber) -{ - ASSERT(fontData || !m_isSystemFallback); - ASSERT(pageNumber == m_pageNumber); - - GlyphPageTreeNode* child = fontData ? m_children.get(fontData) : m_systemFallbackChild; - if (!child) { - child = new GlyphPageTreeNode; - child->m_parent = this; - child->m_level = m_level + 1; - if (fontData && fontData->isCustomFont()) { - for (GlyphPageTreeNode* curr = this; curr; curr = curr->m_parent) - curr->m_customFontCount++; - } - -#ifndef NDEBUG - child->m_pageNumber = m_pageNumber; -#endif - if (fontData) { - m_children.set(fontData, child); - fontData->setMaxGlyphPageTreeLevel(max(fontData->maxGlyphPageTreeLevel(), child->m_level)); - } else { - m_systemFallbackChild = child; - child->m_isSystemFallback = true; - } - child->initializePage(fontData, pageNumber); - } - return child; -} - -void GlyphPageTreeNode::pruneCustomFontData(const FontData* fontData) -{ - if (!fontData || !m_customFontCount) - return; - - // Prune any branch that contains this FontData. - GlyphPageTreeNode* node = m_children.get(fontData); - if (node) { - m_children.remove(fontData); - unsigned fontCount = node->m_customFontCount + 1; - delete node; - for (GlyphPageTreeNode* curr = this; curr; curr = curr->m_parent) - curr->m_customFontCount -= fontCount; - } - - // Check any branches that remain that still have custom fonts underneath them. - if (!m_customFontCount) - return; - HashMap<const FontData*, GlyphPageTreeNode*>::iterator end = m_children.end(); - for (HashMap<const FontData*, GlyphPageTreeNode*>::iterator it = m_children.begin(); it != end; ++it) - it->second->pruneCustomFontData(fontData); -} - -void GlyphPageTreeNode::pruneFontData(const SimpleFontData* fontData, unsigned level) -{ - ASSERT(fontData); - if (!fontData) - return; - - // Prune any branch that contains this FontData. - HashMap<const FontData*, GlyphPageTreeNode*>::iterator child = m_children.find(fontData); - if (child == m_children.end()) { - // If there is no level-1 node for fontData, then there is no deeper node for it in this tree. - if (!level) - return; - } else { - GlyphPageTreeNode* node = child->second; - m_children.remove(fontData); - unsigned customFontCount = node->m_customFontCount; - delete node; - if (customFontCount) { - for (GlyphPageTreeNode* curr = this; curr; curr = curr->m_parent) - curr->m_customFontCount -= customFontCount; - } - } - - level++; - if (level > fontData->maxGlyphPageTreeLevel()) - return; - - HashMap<const FontData*, GlyphPageTreeNode*>::iterator end = m_children.end(); - for (HashMap<const FontData*, GlyphPageTreeNode*>::iterator it = m_children.begin(); it != end; ++it) - it->second->pruneFontData(fontData, level); -} - -#ifndef NDEBUG - void GlyphPageTreeNode::showSubtree() - { - Vector<char> indent(level()); - indent.fill('\t', level()); - indent.append(0); - - HashMap<const FontData*, GlyphPageTreeNode*>::iterator end = m_children.end(); - for (HashMap<const FontData*, GlyphPageTreeNode*>::iterator it = m_children.begin(); it != end; ++it) { - printf("%s\t%p %s\n", indent.data(), it->first, it->first->description().utf8().data()); - it->second->showSubtree(); - } - if (m_systemFallbackChild) { - printf("%s\t* fallback\n", indent.data()); - m_systemFallbackChild->showSubtree(); - } - } -#endif - -} - -#ifndef NDEBUG -void showGlyphPageTrees() -{ - printf("Page 0:\n"); - showGlyphPageTree(0); - HashMap<int, WebCore::GlyphPageTreeNode*>::iterator end = WebCore::GlyphPageTreeNode::roots->end(); - for (HashMap<int, WebCore::GlyphPageTreeNode*>::iterator it = WebCore::GlyphPageTreeNode::roots->begin(); it != end; ++it) { - printf("\nPage %d:\n", it->first); - showGlyphPageTree(it->first); - } -} - -void showGlyphPageTree(unsigned pageNumber) -{ - WebCore::GlyphPageTreeNode::getRoot(pageNumber)->showSubtree(); -} -#endif |