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/*
* Copyright 2009, The Android Open Source Project
* Copyright (C) 2006 Apple Computer, 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``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 "EmojiFont.h"
#include "Font.h"
#include "FontCache.h"
#include "SimpleFontData.h"
#include "FloatRect.h"
#include "FontDescription.h"
#include "SkFontHost.h"
#include "SkPaint.h"
#include "SkTypeface.h"
#include "SkTime.h"
using namespace android;
namespace WebCore {
void SimpleFontData::platformInit()
{
SkPaint paint;
SkPaint::FontMetrics skiaFontMetrics;
m_platformData.setupPaint(&paint);
paint.getFontMetrics(&skiaFontMetrics);
float d = SkScalarToFloat(skiaFontMetrics.fDescent);
float s = SkScalarToFloat(skiaFontMetrics.fDescent - skiaFontMetrics.fAscent);
float a = s - d;
m_fontMetrics.setAscent(a);
m_fontMetrics.setDescent(d);
m_fontMetrics.setXHeight(SkScalarToFloat(-skiaFontMetrics.fAscent) * 0.56f); // hack I stole from the window's port
float lineGap = SkScalarToFloat(skiaFontMetrics.fLeading);
if (platformData().orientation() == Vertical && lineGap == 0) {
lineGap = skiaFontMetrics.fAvgCharWidth * 0.56f;
}
m_fontMetrics.setLineGap(lineGap);
m_fontMetrics.setLineSpacing(a + d + lineGap);
if (platformData().orientation() == Vertical && !isTextOrientationFallback()) {
static const uint32_t vheaTag = SkSetFourByteTag('v', 'h', 'e', 'a');
static const uint32_t vorgTag = SkSetFourByteTag('V', 'O', 'R', 'G');
const SkFontID fontID = m_platformData.uniqueID();
size_t vheaSize = SkFontHost::GetTableSize(fontID, vheaTag);
size_t vorgSize = SkFontHost::GetTableSize(fontID, vorgTag);
if ((vheaSize > 0) || (vorgSize > 0))
m_hasVerticalGlyphs = true;
}
}
void SimpleFontData::platformCharWidthInit()
{
m_avgCharWidth = 0.f;
m_maxCharWidth = 0.f;
initCharWidths();
}
void SimpleFontData::platformDestroy()
{
}
SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
{
if (!m_derivedFontData)
m_derivedFontData = DerivedFontData::create(isCustomFont());
if (!m_derivedFontData->smallCaps)
m_derivedFontData->smallCaps = new SimpleFontData(FontPlatformData(m_platformData, fontDescription.computedSize() * 0.7f));
return m_derivedFontData->smallCaps.get();
}
SimpleFontData* SimpleFontData::emphasisMarkFontData(const FontDescription& fontDescription) const
{
if (!m_derivedFontData)
m_derivedFontData = DerivedFontData::create(isCustomFont());
if (!m_derivedFontData->emphasisMark)
m_derivedFontData->emphasisMark = new SimpleFontData(FontPlatformData(m_platformData, fontDescription.computedSize() * 0.5f));
return m_derivedFontData->emphasisMark.get();
}
bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
{
SkPaint paint;
m_platformData.setupPaint(&paint);
paint.setTextEncoding(SkPaint::kUTF16_TextEncoding);
return paint.containsText(characters, length << 1);
}
void SimpleFontData::determinePitch()
{
m_treatAsFixedPitch = m_platformData.isFixedPitch();
}
FloatRect SimpleFontData::platformBoundsForGlyph(Glyph) const
{
return FloatRect();
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
SkASSERT(sizeof(glyph) == 2); // compile-time assert
SkPaint paint;
m_platformData.setupPaint(&paint);
float advanceWidth;
if (EmojiFont::IsEmojiGlyph(glyph))
advanceWidth = EmojiFont::GetAdvanceWidth(glyph, paint);
else {
paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
advanceWidth = SkScalarToFloat(paint.measureText(&glyph, 2));
}
return advanceWidth;
}
}
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