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/*
* 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.
* 3. Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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 "Font.h"
#include "FontCache.h"
#include "SimpleFontData.h"
#include "FloatRect.h"
#include "FontDescription.h"
#include <wtf/MathExtras.h>
#include <unicode/uchar.h>
#include <unicode/unorm.h>
#include <mlang.h>
#include "webkit/glue/webkit_glue.h"
namespace WebCore {
static inline float scaleEmToUnits(float x, int unitsPerEm)
{
return unitsPerEm ? x / (float)unitsPerEm : x;
}
void SimpleFontData::platformInit()
{
HDC dc = GetDC(0);
HGDIOBJ oldFont = SelectObject(dc, m_font.hfont());
m_isSystemFont = false;
TEXTMETRIC tm = {0};
if (!GetTextMetrics(dc, &tm)) {
if (webkit_glue::EnsureFontLoaded(m_font.hfont())) {
// Retry GetTextMetrics.
// TODO(nsylvain): Handle gracefully the error if this call also
// fails.
// See bug 1136944.
if (!GetTextMetrics(dc, &tm)) {
ASSERT_NOT_REACHED();
}
}
}
m_avgCharWidth = tm.tmAveCharWidth;
m_maxCharWidth = tm.tmMaxCharWidth;
m_ascent = tm.tmAscent;
m_descent = tm.tmDescent;
m_lineGap = tm.tmExternalLeading;
m_xHeight = m_ascent * 0.56f; // Best guess for xHeight for non-Truetype fonts.
OUTLINETEXTMETRIC otm;
if (GetOutlineTextMetrics(dc, sizeof(otm), &otm) > 0) {
// This is a TrueType font. We might be able to get an accurate xHeight.
GLYPHMETRICS gm = {0};
MAT2 mat = {{0, 1}, {0, 0}, {0, 0}, {0, 1}}; // The identity matrix.
DWORD len = GetGlyphOutlineW(dc, 'x', GGO_METRICS, &gm, 0, 0, &mat);
if (len != GDI_ERROR && gm.gmBlackBoxY > 0)
m_xHeight = static_cast<float>(gm.gmBlackBoxY);
}
m_lineSpacing = m_ascent + m_descent + m_lineGap;
SelectObject(dc, oldFont);
ReleaseDC(0, dc);
// Uniscribe will allocate this for us, and expects it to be initialized to
// NULL.
m_scriptCache = 0;
// It's unclear why this variable is a pointer.
m_scriptFontProperties = 0;
}
void SimpleFontData::platformDestroy()
{
if (m_font.isMLangFont()) {
// We have to release the font instead of just deleting it, since we
// didn't make it.
//
// TODO(brettw): bug 1072298: This should be removed when we remove
// IMLangFontLink2 support. I think this is incorrect, as it will delete
// the font out from under any other PlatformData structures that share
// the same internal refcounted objects.
IMLangFontLink2* langFontLink = FontCache::getFontLinkInterface();
if (langFontLink)
langFontLink->ReleaseFont(m_font.hfont());
}
// We don't hash this on Win32, so it's effectively owned by us.
delete m_smallCapsFontData;
m_smallCapsFontData = NULL;
ScriptFreeCache(&m_scriptCache);
delete m_scriptFontProperties;
}
SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
{
if (!m_smallCapsFontData) {
LOGFONT winfont;
GetObject(m_font.hfont(), sizeof(LOGFONT), &winfont);
float smallCapsSize = 0.70f * fontDescription.computedSize();
// Unlike WebKit trunk, we don't multiply the size by 32. That seems
// to be some kind of artifact of their CG backend, or something.
winfont.lfHeight = -lroundf(smallCapsSize);
HFONT hfont = CreateFontIndirect(&winfont);
m_smallCapsFontData =
new SimpleFontData(FontPlatformData(hfont, smallCapsSize,
false));
}
return m_smallCapsFontData;
}
bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
{
// FIXME: Microsoft documentation seems to imply that characters can be output using a given font and DC
// merely by testing code page intersection. This seems suspect though. Can't a font only partially
// cover a given code page?
IMLangFontLink2* langFontLink = FontCache::getFontLinkInterface();
if (!langFontLink)
return false;
HDC dc = GetDC((HWND)0);
DWORD acpCodePages;
langFontLink->CodePageToCodePages(CP_ACP, &acpCodePages);
DWORD fontCodePages;
langFontLink->GetFontCodePages(dc, m_font.hfont(), &fontCodePages);
DWORD actualCodePages;
long numCharactersProcessed;
long offset = 0;
while (offset < length) {
langFontLink->GetStrCodePages(characters, length, acpCodePages, &actualCodePages, &numCharactersProcessed);
if ((actualCodePages & fontCodePages) == 0)
return false;
offset += numCharactersProcessed;
}
ReleaseDC(0, dc);
return true;
}
void SimpleFontData::determinePitch()
{
// TEXTMETRICS have this. Set m_treatAsFixedPitch based off that.
HDC dc = GetDC((HWND)0);
HGDIOBJ oldFont = SelectObject(dc, m_font.hfont());
// Yes, this looks backwards, but the fixed pitch bit is actually set if the font
// is *not* fixed pitch. Unbelievable but true.
TEXTMETRIC tm = {0};
if (!GetTextMetrics(dc, &tm)) {
if (webkit_glue::EnsureFontLoaded(m_font.hfont())) {
// Retry GetTextMetrics.
// TODO(nsylvain): Handle gracefully the error if this call also fails.
// See bug 1136944.
if (!GetTextMetrics(dc, &tm)) {
ASSERT_NOT_REACHED();
}
}
}
m_treatAsFixedPitch = ((tm.tmPitchAndFamily & TMPF_FIXED_PITCH) == 0);
SelectObject(dc, oldFont);
ReleaseDC(0, dc);
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
HDC dc = GetDC(0);
HGDIOBJ oldFont = SelectObject(dc, m_font.hfont());
int width = 0;
if (!GetCharWidthI(dc, glyph, 1, 0, &width)) {
// Ask the browser to preload the font and retry.
if (webkit_glue::EnsureFontLoaded(m_font.hfont())) {
if (!GetCharWidthI(dc, glyph, 1, 0, &width)) {
ASSERT_NOT_REACHED();
}
}
}
SelectObject(dc, oldFont);
ReleaseDC(0, dc);
return static_cast<float>(width);
}
SCRIPT_FONTPROPERTIES* SimpleFontData::scriptFontProperties() const
{
if (!m_scriptFontProperties) {
m_scriptFontProperties = new SCRIPT_FONTPROPERTIES;
memset(m_scriptFontProperties, 0, sizeof(SCRIPT_FONTPROPERTIES));
m_scriptFontProperties->cBytes = sizeof(SCRIPT_FONTPROPERTIES);
HRESULT result = ScriptGetFontProperties(0, scriptCache(),
m_scriptFontProperties);
if (result == E_PENDING) {
HDC dc = GetDC(0);
HGDIOBJ oldFont = SelectObject(dc, m_font.hfont());
HRESULT hr = ScriptGetFontProperties(dc, scriptCache(),
m_scriptFontProperties);
if (S_OK != hr) {
if (webkit_glue::EnsureFontLoaded(m_font.hfont())) {
// Retry ScriptGetFontProperties.
// TODO(nsylvain): Handle gracefully the error if this call
// also fails. See bug 1136944.
hr = ScriptGetFontProperties(dc, scriptCache(),
m_scriptFontProperties);
if (S_OK != hr) {
ASSERT_NOT_REACHED();
}
}
}
SelectObject(dc, oldFont);
ReleaseDC(0, dc);
}
}
return m_scriptFontProperties;
}
}
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