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/*
* Copyright (C) 2012, 2013 Research In Motion Limited. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "SimpleFontData.h"
#include "FloatRect.h"
#include "Font.h"
#include "FontCache.h"
#include "FontDescription.h"
#include "ITypeUtils.h"
#include <fs_api.h>
#include <unicode/normlzr.h>
namespace WebCore {
static inline float FSFixedToFloat(FS_FIXED n) { return n / 65536.0; }
#define openTypeTag(a, b, c, d) (FS_ULONG)((a << 24) | (b << 16) | (c << 8) | d)
void SimpleFontData::platformInit()
{
FS_FIXED ascender = 0;
FS_FIXED descender = 0;
FS_FIXED leading = 0;
FsAscDescLeadSource source;
FS_LONG result;
if (m_platformData.size() > 0) {
// FIXME: hack! FS_get_ascender_descender_leading() returns ERR_NO_CURRENT_SFNT when size is 0, even though we called FS_set_scale and m_platformData.font()->cur_sfnt is not 0
result = FS_get_ascender_descender_leading(m_platformData.font(), &ascender, &descender, &leading, &source);
ASSERT_UNUSED(result, result == SUCCESS);
}
m_fontMetrics.setAscent(FS_ROUND(ascender));
m_fontMetrics.setDescent(FS_ROUND(descender));
m_fontMetrics.setLineGap(iTypeFixedToFloat(leading));
m_fontMetrics.setLineSpacing(lroundf(m_fontMetrics.ascent()) + lroundf(m_fontMetrics.descent()) + lroundf(m_fontMetrics.lineGap()));
FONT_METRICS metrics;
result = FS_font_metrics(m_platformData.font(), &metrics);
ASSERT_UNUSED(result, result == SUCCESS);
// m_fontMetrics.setUnitsPerEm(FS_get_design_units(m_platformData().font()));
m_fontMetrics.setUnitsPerEm(metrics.unitsPerEm);
FS_USHORT xRange = metrics.font_bbox.xMax - metrics.font_bbox.xMin;
m_maxCharWidth = roundf((xRange * roundf(m_platformData.size())) / metrics.unitsPerEm);
TTF_OS2 os2;
if (FS_get_table_structure(m_platformData.font(), TAG_OS2, &os2) == SUCCESS && os2.sxHeight && os2.xAvgCharWidth) {
FS_USHORT yppem = m_platformData.font()->lpm;
m_fontMetrics.setXHeight(static_cast<float>(os2.sxHeight) * yppem / metrics.unitsPerEm);
m_avgCharWidth = static_cast<float>(os2.xAvgCharWidth) * yppem / metrics.unitsPerEm;
} else {
// HACK
m_fontMetrics.setXHeight(m_fontMetrics.ascent() * 0.56);
m_fontMetrics.setHasXHeight(false);
m_avgCharWidth = m_fontMetrics.xHeight();
GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
if (glyphPageZero) {
static const UChar32 xChar = 'x';
const Glyph xGlyph = glyphPageZero->glyphDataForCharacter(xChar).glyph;
if (xGlyph) {
// In widthForGlyph(), xGlyph will be compared with
// m_zeroWidthSpaceGlyph, which isn't initialized yet here.
// Initialize it with zero to make sure widthForGlyph() returns
// the right width.
m_zeroWidthSpaceGlyph = 0;
m_avgCharWidth = widthForGlyph(xGlyph);
}
}
}
if (m_platformData.orientation() == Vertical && !isTextOrientationFallback())
m_hasVerticalGlyphs = FS_get_table(m_platformData.font(), openTypeTag('v', 'h', 'e', 'a'), TBL_QUERY, 0)
|| FS_get_table(m_platformData.font(), openTypeTag('V', 'O', 'R', 'G'), TBL_QUERY, 0);
}
void SimpleFontData::platformCharWidthInit()
{
}
void SimpleFontData::platformDestroy()
{
}
PassRefPtr<SimpleFontData> SimpleFontData::platformCreateScaledFontData(const FontDescription& fontDescription, float scaleFactor) const
{
const float scaledSize = lroundf(fontDescription.computedSize() * scaleFactor);
return adoptRef(new SimpleFontData(
FontPlatformData(m_platformData.font()->cur_lfnt->name,
scaledSize,
m_platformData.syntheticBold(),
m_platformData.syntheticOblique(),
m_platformData.orientation(),
m_platformData.widthVariant()),
isCustomFont(), false));
}
bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
{
int position = 0;
while (position < length) {
// FIXME: use shaper?
UChar32 character;
int nextPosition = position;
U16_NEXT(characters, nextPosition, length, character);
FS_USHORT glyph = FS_map_char(m_platformData.font(), static_cast<FS_ULONG>(character));
if (!glyph)
return false;
position = nextPosition;
}
return true;
}
void SimpleFontData::determinePitch()
{
m_treatAsFixedPitch = m_platformData.isFixedPitch();
}
FloatRect SimpleFontData::platformBoundsForGlyph(Glyph glyph) const
{
FS_GLYPHMAP* glyphmap = FS_get_glyphmap(m_platformData.font(), glyph, FS_MAP_DISTANCEFIELD | FS_MAP_GRAYMAP8);
if (!glyphmap)
return FloatRect();
FloatRect bounds(glyphmap->lo_x, glyphmap->height - glyphmap->hi_y, glyphmap->width, glyphmap->height);
FS_free_char(m_platformData.font(), glyphmap);
return bounds;
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
FS_SHORT idx, idy;
FS_FIXED dx, dy;
FS_FIXED s00, s01, s10, s11;
bool needsFakeBoldReset = m_platformData.syntheticBold() && m_treatAsFixedPitch;
if (needsFakeBoldReset) {
FS_get_scale(m_platformData.font(), &s00, &s01, &s10, &s11);
FS_set_bold_pct(m_platformData.font(), 0);
FS_set_scale(m_platformData.font(), s00, s01, s10, s11);
}
if (FS_get_advance(m_platformData.font(), glyph, FS_MAP_DISTANCEFIELD | FS_MAP_GRAYMAP8, &idx, &idy, &dx, &dy) != SUCCESS)
dx = 0;
if (needsFakeBoldReset) {
FS_set_bold_pct(m_platformData.font(), ITYPEFAKEBOLDAMOUNT);
FS_set_scale(m_platformData.font(), s00, s01, s10, s11);
}
return iTypeFixedToFloat(dx);
}
bool SimpleFontData::canRenderCombiningCharacterSequence(const UChar* characters, size_t length) const
{
if (!m_combiningCharacterSequenceSupport)
m_combiningCharacterSequenceSupport = adoptPtr(new HashMap<String, bool>);
WTF::HashMap<String, bool>::AddResult addResult = m_combiningCharacterSequenceSupport->add(String(characters, length), false);
if (!addResult.isNewEntry)
return addResult.iterator->value;
UErrorCode error = U_ZERO_ERROR;
Vector<UChar, 4> normalizedCharacters(length);
int32_t normalizedLength = unorm_normalize(characters, length, UNORM_NFC, UNORM_UNICODE_3_2, &normalizedCharacters[0], length, &error);
if (U_FAILURE(error))
return false;
int position = 0;
while (position < normalizedLength) {
UChar32 character;
int nextPosition = position;
U16_NEXT(normalizedCharacters, nextPosition, normalizedLength, character);
if (!u_hasBinaryProperty(character, UCHAR_DEFAULT_IGNORABLE_CODE_POINT)) {
FS_USHORT glyph = FS_map_char(m_platformData.font(), static_cast<FS_ULONG>(character));
if (!glyph)
return false;
}
position = nextPosition;
}
addResult.iterator->value = true;
return true;
}
} // namespace WebCore
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