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/*
* Copyright (c) 2006, 2007, 2008, 2009, Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER 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 "Font.h"
#include "PlatformBridge.h"
#include "SimpleFontData.h"
#include "TextRun.h"
namespace WebCore {
UniscribeHelperTextRun::UniscribeHelperTextRun(const TextRun& run,
const 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(0)
, 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.
PlatformBridge::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 FontData *fontData = m_font->fontDataAt(m_fontIndex);
if (!fontData) {
// Ran out of fonts.
m_fontIndex = -1;
return false;
}
// FIXME: this won't work for SegmentedFontData
// http://crbug.com/6425
const 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
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