/*

 * 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;

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 */

#include "config.h"

#include <winsock2.h>

#include "Font.h"

#include "FontCache.h"

#include "FontData.h"

#include "FloatRect.h"

#include "FontDescription.h"

#include <wtf/MathExtras.h>

#include <unicode/uchar.h>

#include <unicode/unorm.h>

#include <ApplicationServices/ApplicationServices.h>

#include <mlang.h>

#include <tchar.h>

#include <WebKitSystemInterface/WebKitSystemInterface.h>

namespace WebCore {

using std::max;

static inline float scaleEmToUnits(float x, unsigned unitsPerEm) { return unitsPerEm ? x / (float)unitsPerEm : x; }

void FontData::platformInit()

{    

    HDC dc = GetDC(0);

    SaveDC(dc);

    SelectObject(dc, m_font.hfont());

    int faceLength = GetTextFace(dc, 0, 0);

    Vector<TCHAR> faceName(faceLength);

    GetTextFace(dc, faceLength, faceName.data());

    m_syntheticBoldOffset = m_font.syntheticBold() ? 1.0f : 0.f;

    CGFontRef font = m_font.cgFont();

    int iAscent = CGFontGetAscent(font);

    int iDescent = CGFontGetDescent(font);

    int iLineGap = CGFontGetLeading(font);

    unsigned unitsPerEm = CGFontGetUnitsPerEm(font);

    float pointSize = m_font.size();

    float fAscent = scaleEmToUnits(iAscent, unitsPerEm) * pointSize;

    float fDescent = -scaleEmToUnits(iDescent, unitsPerEm) * pointSize;

    float fLineGap = scaleEmToUnits(iLineGap, unitsPerEm) * pointSize;

    m_isSystemFont = !_tcscmp(faceName.data(), _T("Lucida Grande"));

    // We need to adjust Times, Helvetica, and Courier to closely match the

    // vertical metrics of their Microsoft counterparts that are the de facto

    // web standard. The AppKit adjustment of 20% is too big and is

    // incorrectly added to line spacing, so we use a 15% adjustment instead

    // and add it to the ascent.

    if (!_tcscmp(faceName.data(), _T("Times")) || !_tcscmp(faceName.data(), _T("Helvetica")) || !_tcscmp(faceName.data(), _T("Courier")))

        fAscent += floorf(((fAscent + fDescent) * 0.15f) + 0.5f);

    m_ascent = lroundf(fAscent);

    m_descent = lroundf(fDescent);

    m_lineGap = lroundf(fLineGap);

    m_lineSpacing = m_ascent + m_descent + m_lineGap;

    // Measure the actual character "x", because AppKit synthesizes X height rather than getting it from the font.

    // Unfortunately, NSFont will round this for us so we don't quite get the right value.

    Glyph xGlyph = GlyphPageTreeNode::getRootChild(this, 0)->page()->glyphDataForCharacter('x').glyph;

    if (xGlyph) {

        CGRect xBox;

        CGFontGetGlyphBBoxes(font, &xGlyph, 1, &xBox);

        // Use the maximum of either width or height because "x" is nearly square

        // and web pages that foolishly use this metric for width will be laid out

        // poorly if we return an accurate height. Classic case is Times 13 point,

        // which has an "x" that is 7x6 pixels.

        m_xHeight = scaleEmToUnits(max(CGRectGetMaxX(xBox), CGRectGetMaxY(xBox)), unitsPerEm) * pointSize;

    } else {

        int iXHeight = CGFontGetXHeight(font);

        m_xHeight = scaleEmToUnits(iXHeight, unitsPerEm) * pointSize;

    }

    RestoreDC(dc, -1);

    ReleaseDC(0, dc);

    m_scriptCache = 0;

    m_scriptFontProperties = 0;

}

void FontData::platformDestroy()

{

    CGFontRelease(m_font.cgFont());

    DeleteObject(m_font.hfont());

    // We don't hash this on Win32, so it's effectively owned by us.

    delete m_smallCapsFontData;

    ScriptFreeCache(&m_scriptCache);

    delete m_scriptFontProperties;

}

FontData* FontData::smallCapsFontData(const FontDescription& fontDescription) const

{

    if (!m_smallCapsFontData) {

        LOGFONT winfont;

        GetObject(m_font.hfont(), sizeof(LOGFONT), &winfont);

        int smallCapsHeight = lroundf(0.70f * fontDescription.computedSize());

        winfont.lfHeight = -smallCapsHeight * 32;

        HFONT hfont = CreateFontIndirect(&winfont);

        m_smallCapsFontData = new FontData(FontPlatformData(hfont, smallCapsHeight, fontDescription.bold(), fontDescription.italic()));

    }

    return m_smallCapsFontData;

}

bool FontData::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 FontData::determinePitch()

{

    // TEXTMETRICS have this.  Set m_treatAsFixedPitch based off that.

    HDC dc = GetDC((HWND)0);

    SaveDC(dc);

    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;

    GetTextMetrics(dc, &tm);

    m_treatAsFixedPitch = ((tm.tmPitchAndFamily & TMPF_FIXED_PITCH) == 0);

    RestoreDC(dc, -1);

    ReleaseDC(0, dc);

}

float FontData::platformWidthForGlyph(Glyph glyph) const

{

    CGFontRef font = m_font.cgFont();

    float pointSize = m_font.size();

    CGSize advance;

    CGAffineTransform m = CGAffineTransformMakeScale(pointSize, pointSize);

    // FIXME: Need to add real support for printer fonts.

    bool isPrinterFont = false;

    wkGetGlyphAdvances(font, m, m_isSystemFont, isPrinterFont, glyph, advance);

    return advance.width + m_syntheticBoldOffset;

}

SCRIPT_FONTPROPERTIES* FontData::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);

            SaveDC(dc);

            SelectObject(dc, m_font.hfont());

            ScriptGetFontProperties(dc, scriptCache(), m_scriptFontProperties);

            RestoreDC(dc, -1);

            ReleaseDC(0, dc);

        }

    }

    return m_scriptFontProperties;

}

}