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Diffstat (limited to 'webkit/port/platform/graphics/UniscribeHelperTextRun.cpp')
| -rw-r--r-- | webkit/port/platform/graphics/UniscribeHelperTextRun.cpp | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/webkit/port/platform/graphics/UniscribeHelperTextRun.cpp b/webkit/port/platform/graphics/UniscribeHelperTextRun.cpp new file mode 100644 index 0000000..93d23e9 --- /dev/null +++ b/webkit/port/platform/graphics/UniscribeHelperTextRun.cpp @@ -0,0 +1,135 @@ +/* + * Copyright (C) 2006, 2007 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. + * + * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 COMPUTER, INC. OR + * 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 "UniscribeHelperTextRun.h" + +#include "ChromiumBridge.h" +#include "Font.h" +#include "SimpleFontData.h" + +namespace WebCore { + +UniscribeHelperTextRun::UniscribeHelperTextRun(const WebCore::TextRun& run, + const WebCore::Font& font) + : UniscribeHelper(run.characters(), run.length(), run.rtl(), + font.primaryFont()->platformData().hfont(), + font.primaryFont()->platformData().scriptCache(), + font.primaryFont()->platformData().scriptFontProperties()) + , m_font(&font) + , m_fontIndex(0) +{ + setDirectionalOverride(run.directionalOverride()); + setLetterSpacing(font.letterSpacing()); + setSpaceWidth(font.spaceWidth()); + setWordSpacing(font.wordSpacing()); + setAscent(font.primaryFont()->ascent()); + + Init(); + + // Padding is the amount to add to make justification happen. This + // should be done after Init() so all the runs are already measured. + if (run.padding() > 0) + Justify(run.padding()); +} + +UniscribeHelperTextRun::UniscribeHelperTextRun( + const wchar_t* input, + int inputLength, + bool isRtl, + HFONT hfont, + SCRIPT_CACHE* scriptCache, + SCRIPT_FONTPROPERTIES* fontProperties) + : UniscribeHelper(input, inputLength, isRtl, hfont, + scriptCache, fontProperties) + , m_font(NULL) + , m_fontIndex(-1) +{ +} + +void UniscribeHelperTextRun::TryToPreloadFont(HFONT font) +{ + // Ask the browser to get the font metrics for this font. + // That will preload the font and it should now be accessible + // from the renderer. + WebCore::ChromiumBridge::ensureFontLoaded(font); +} + +bool UniscribeHelperTextRun::NextWinFontData( + HFONT* hfont, + SCRIPT_CACHE** scriptCache, + SCRIPT_FONTPROPERTIES** fontProperties, + int* ascent) +{ + // This check is necessary because NextWinFontData can be called again + // after we already ran out of fonts. fontDataAt behaves in a strange + // manner when the difference between param passed and # of fonts stored in + // WebKit::Font is larger than one. We can avoid this check by setting + // font_index_ to # of elements in hfonts_ when we run out of font. In that + // case, we'd have to go through a couple of more checks before returning + // false. + if (m_fontIndex == -1 || !m_font) + return false; + + // If the font data for a fallback font requested is not yet retrieved, add + // them to our vectors. Note that '>' rather than '>=' is used to test that + // condition. primaryFont is not stored in hfonts_, and friends so that + // indices for fontDataAt and our vectors for font data are 1 off from each + // other. That is, when fully populated, hfonts_ and friends have one font + // fewer than what's contained in font_. + if (static_cast<size_t>(++m_fontIndex) > m_hfonts.size()) { + const WebCore::FontData *fontData = m_font->fontDataAt(m_fontIndex); + if (!fontData) { + // Ran out of fonts. + m_fontIndex = -1; + return false; + } + + // TODO(ericroman): this won't work for SegmentedFontData + // http://b/issue?id=1007335 + const WebCore::SimpleFontData* simpleFontData = + fontData->fontDataForCharacter(' '); + + m_hfonts.append(simpleFontData->platformData().hfont()); + m_scriptCaches.append( + simpleFontData->platformData().scriptCache()); + m_fontProperties.append( + simpleFontData->platformData().scriptFontProperties()); + m_ascents.append(simpleFontData->ascent()); + } + + *hfont = m_hfonts[m_fontIndex - 1]; + *scriptCache = m_scriptCaches[m_fontIndex - 1]; + *fontProperties = m_fontProperties[m_fontIndex - 1]; + *ascent = m_ascents[m_fontIndex - 1]; + return true; +} + +void UniscribeHelperTextRun::ResetFontIndex() +{ + m_fontIndex = 0; +} + +} // namespace WebCore |