| /* |
| * 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 "SegmentedFontData.h" |
| #include "SimpleFontData.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; |
| } |
| |
| 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); |
| } |
| |
| GlyphPageTreeNode::~GlyphPageTreeNode() |
| { |
| deleteAllValues(m_children); |
| delete m_systemFallbackChild; |
| } |
| |
| 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; |
| |
| // \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 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[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 = new GlyphPage(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; |
| for (unsigned i = 0; i < numRanges; i++) { |
| const FontDataRange& range = segmentedFontData->rangeAt(i); |
| int from = max(0, range.from() - static_cast<int>(start)); |
| int to = 1 + min(range.to() - static_cast<int>(start), static_cast<int>(GlyphPage::size) - 1); |
| if (from < static_cast<int>(GlyphPage::size) && to > 0) { |
| if (!zeroFilled) { |
| if (from > 0 || to < static_cast<int>(GlyphPage::size)) { |
| for (unsigned i = 0; i < GlyphPage::size; i++) |
| m_page->setGlyphDataForIndex(i, 0, 0); |
| } |
| zeroFilled = true; |
| } |
| haveGlyphs |= m_page->fill(from, to - from, buffer + from * (start < 0x10000 ? 1 : 2), (to - from) * (start < 0x10000 ? 1 : 2), range.fontData()); |
| } |
| } |
| } else |
| haveGlyphs = m_page->fill(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 = new GlyphPage(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->m_glyphs[i].glyph) |
| m_page->m_glyphs[i] = parentPage->m_glyphs[i]; |
| else if (fallbackPage->m_glyphs[i].glyph) { |
| m_page->m_glyphs[i] = fallbackPage->m_glyphs[i]; |
| newGlyphs = true; |
| } else { |
| const GlyphData data = { 0, 0 }; |
| m_page->m_glyphs[i] = data; |
| } |
| } |
| |
| if (!newGlyphs) |
| // We didn't override anything, so our override is just the parent page. |
| m_page = parentPage; |
| } |
| } |
| } else { |
| m_page = new GlyphPage(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) |
| memcpy(m_page->m_glyphs, parentPage->m_glyphs, GlyphPage::size * sizeof(m_page->m_glyphs[0])); |
| else { |
| const GlyphData data = { 0, 0 }; |
| for (unsigned i = 0; i < GlyphPage::size; i++) |
| m_page->m_glyphs[i] = data; |
| } |
| } |
| } |
| |
| 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); |
| 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); |
| } |
| |
| } |
