FontPlatformDataChromiumWin.cpp   [plain text]

/*
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 * Copyright (c) 2006, 2007, 2008, 2009, 2012 Google Inc. All rights reserved.
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
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 */

#include "config.h"
#include "FontPlatformData.h"

#include <windows.h>
#include <objidl.h>
#include <mlang.h>

#include "HWndDC.h"
#include "PlatformSupport.h"
#include "SkTypeface_win.h"
#include "SkiaFontWin.h"
#include <wtf/StdLibExtras.h>

namespace WebCore {

SkTypeface* CreateTypefaceFromHFont(HFONT hfont, int* size, int* lfQuality)
{
    LOGFONT info;
    GetObject(hfont, sizeof(info), &info);
    if (size) {
        int height = info.lfHeight;
        if (height < 0)
            height = -height;
        *size = height;
    }
    if (lfQuality)
        *lfQuality = info.lfQuality;
    return SkCreateTypefaceFromLOGFONT(info);
}

FontPlatformData::FontPlatformData(WTF::HashTableDeletedValueType)
    : m_font(hashTableDeletedFontValue())
    , m_size(-1)
    , m_scriptCache(0)
    , m_scriptFontProperties(0)
    , m_typeface(0)
    , m_lfQuality(DEFAULT_QUALITY)
{
}

FontPlatformData::FontPlatformData()
    : m_font(0)
    , m_size(0)
    , m_scriptCache(0)
    , m_scriptFontProperties(0)
    , m_typeface(0)
    , m_lfQuality(DEFAULT_QUALITY)
{
}

FontPlatformData::FontPlatformData(HFONT font, float size)
    : m_font(RefCountedHFONT::create(font))
    , m_size(size)
    , m_scriptCache(0)
    , m_scriptFontProperties(0)
    , m_typeface(CreateTypefaceFromHFont(font, 0, &m_lfQuality))
{
}

// FIXME: this constructor is needed for SVG fonts but doesn't seem to do much
FontPlatformData::FontPlatformData(float size, bool bold, bool oblique)
    : m_font(0)
    , m_size(size)
    , m_scriptCache(0)
    , m_scriptFontProperties(0)
    , m_typeface(0)
    , m_lfQuality(DEFAULT_QUALITY)
{
}

FontPlatformData::FontPlatformData(const FontPlatformData& data)
    : m_font(data.m_font)
    , m_size(data.m_size)
    , m_scriptCache(0)
    , m_scriptFontProperties(0)
    , m_typeface(data.m_typeface)
    , m_lfQuality(data.m_lfQuality)
{
    SkSafeRef(m_typeface);
}

FontPlatformData& FontPlatformData::operator=(const FontPlatformData& data)
{
    if (this != &data) {
        m_font = data.m_font;
        m_size = data.m_size;
        SkRefCnt_SafeAssign(m_typeface, data.m_typeface);
        m_lfQuality = data.m_lfQuality;

        // The following fields will get re-computed if necessary.
        ScriptFreeCache(&m_scriptCache);
        m_scriptCache = 0;

        delete m_scriptFontProperties;
        m_scriptFontProperties = 0;
    } 
    return *this;
}

FontPlatformData::~FontPlatformData()
{
    SkSafeUnref(m_typeface);

    ScriptFreeCache(&m_scriptCache);
    m_scriptCache = 0;

    delete m_scriptFontProperties;
    m_scriptFontProperties = 0;
}

FontPlatformData::RefCountedHFONT::~RefCountedHFONT()
{
    if (m_hfont != reinterpret_cast<HFONT>(-1)) {
        DeleteObject(m_hfont);
    }
}

FontPlatformData::RefCountedHFONT* FontPlatformData::hashTableDeletedFontValue()
{
    DEFINE_STATIC_LOCAL(RefPtr<RefCountedHFONT>, deletedValue,
                        (RefCountedHFONT::create(reinterpret_cast<HFONT>(-1))));
    return deletedValue.get();
}

SCRIPT_FONTPROPERTIES* FontPlatformData::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) {
            HWndDC dc(0);
            HGDIOBJ oldFont = SelectObject(dc, hfont());
            HRESULT hr = ScriptGetFontProperties(dc, scriptCache(),
                                                 m_scriptFontProperties);
            if (S_OK != hr) {
                if (PlatformSupport::ensureFontLoaded(hfont())) {
                    // FIXME: Handle gracefully the error if this call also fails.
                    hr = ScriptGetFontProperties(dc, scriptCache(),
                                                 m_scriptFontProperties);
                    if (S_OK != hr) {
                        LOG_ERROR("Unable to get the font properties after second attempt");
                    }
                }
            }

            SelectObject(dc, oldFont);
        }
    }
    return m_scriptFontProperties;
}

#ifndef NDEBUG
String FontPlatformData::description() const
{
    return String();
}
#endif

}