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/*
* Copyright (c) 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 "SimpleFontData.h"
#include "Font.h"
#include "FontCache.h"
#include "FloatRect.h"
#include "FontDescription.h"
#include "Logging.h"
#include "NotImplemented.h"
#include "SkPaint.h"
#include "SkTypeface.h"
#include "SkTime.h"
namespace WebCore {
// Smallcaps versions of fonts are 70% the size of the normal font.
static const float smallCapsFraction = 0.7f;
void SimpleFontData::platformInit()
{
SkPaint paint;
SkPaint::FontMetrics metrics;
m_font.setupPaint(&paint);
paint.getFontMetrics(&metrics);
// Beware those who step here: This code is designed to match Win32 font
// metrics *exactly*.
if (metrics.fVDMXMetricsValid) {
m_ascent = metrics.fVDMXAscent;
m_descent = metrics.fVDMXDescent;
} else {
m_ascent = SkScalarRound(-metrics.fAscent);
m_descent = SkScalarRound(metrics.fHeight) - m_ascent;
}
if (metrics.fXHeight)
m_xHeight = metrics.fXHeight;
else {
// hack taken from the Windows port
m_xHeight = static_cast<float>(m_ascent) * 0.56;
}
m_lineGap = SkScalarRound(metrics.fLeading);
m_lineSpacing = m_ascent + m_descent + m_lineGap;
// In WebKit/WebCore/platform/graphics/SimpleFontData.cpp, m_spaceWidth is
// calculated for us, but we need to calculate m_maxCharWidth and
// m_avgCharWidth in order for text entry widgets to be sized correctly.
m_maxCharWidth = SkScalarRound(metrics.fXRange * SkScalarRound(m_font.size()));
if (metrics.fAvgCharWidth)
m_avgCharWidth = SkScalarRound(metrics.fAvgCharWidth);
else {
m_avgCharWidth = m_xHeight;
GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
if (glyphPageZero) {
static const UChar32 x_char = 'x';
const Glyph xGlyph = glyphPageZero->glyphDataForCharacter(x_char).glyph;
if (xGlyph)
m_avgCharWidth = widthForGlyph(xGlyph);
}
}
}
void SimpleFontData::platformDestroy()
{
delete m_smallCapsFontData;
m_smallCapsFontData = 0;
}
SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
{
if (!m_smallCapsFontData) {
const float smallCapsSize = lroundf(fontDescription.computedSize() * smallCapsFraction);
m_smallCapsFontData = new SimpleFontData(FontPlatformData(m_font, smallCapsSize));
}
return m_smallCapsFontData;
}
bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
{
SkPaint paint;
static const unsigned maxBufferCount = 64;
uint16_t glyphs[maxBufferCount];
m_font.setupPaint(&paint);
paint.setTextEncoding(SkPaint::kUTF16_TextEncoding);
while (length > 0) {
int n = SkMin32(length, SK_ARRAY_COUNT(glyphs));
// textToGlyphs takes a byte count so we double the character count.
int count = paint.textToGlyphs(characters, n * 2, glyphs);
for (int i = 0; i < count; i++) {
if (0 == glyphs[i])
return false; // missing glyph
}
characters += n;
length -= n;
}
return true;
}
void SimpleFontData::determinePitch()
{
m_treatAsFixedPitch = platformData().isFixedPitch();
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
SkASSERT(sizeof(glyph) == 2); // compile-time assert
SkPaint paint;
m_font.setupPaint(&paint);
paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
SkScalar width = paint.measureText(&glyph, 2);
return SkScalarToFloat(width);
}
} // namespace WebCore
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