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/*
* Copyright (C) 2007 Kevin Ollivier <kevino@theolliviers.com>
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 COMPUTER, INC. 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 <wx/defs.h>
#include <wx/gdicmn.h>
#include "fontprops.h"
#include "math.h"
#include "MathExtras.h"
#include <wx/wx.h>
#include "wx/msw/private.h"
inline long my_round(double x)
{
return (long)(x < 0 ? x - 0.5 : x + 0.5);
}
wxFontProperties::wxFontProperties(wxFont* font):
m_ascent(0), m_descent(0), m_lineGap(0), m_lineSpacing(0), m_xHeight(0)
{
HDC dc = GetDC(0);
WXHFONT hFont = font->GetHFONT();
::SelectObject(dc, hFont);
if (font){
int height = font->GetPointSize();
TEXTMETRIC tm;
GetTextMetrics(dc, &tm);
m_ascent = lroundf(tm.tmAscent);
m_descent = lroundf(tm.tmDescent);
m_xHeight = m_ascent * 0.56f; // Best guess for xHeight for non-Truetype fonts.
m_lineGap = lroundf(tm.tmExternalLeading);
m_lineSpacing = m_lineGap + m_ascent + m_descent;
}
RestoreDC(dc, -1);
ReleaseDC(0, dc);
}
void GetTextExtent( const wxFont& font, const wxString& str, wxCoord *width, wxCoord *height,
wxCoord *descent, wxCoord *externalLeading )
{
HDC dc = GetDC(0);
WXHFONT hFont = font.GetHFONT();
::SelectObject(dc, hFont);
HFONT hfontOld;
if ( font != wxNullFont )
{
wxASSERT_MSG( font.Ok(), _T("invalid font in wxDC::GetTextExtent") );
hfontOld = (HFONT)::SelectObject(dc, hFont);
}
else // don't change the font
{
hfontOld = 0;
}
SIZE sizeRect;
const size_t len = str.length();
if ( !::GetTextExtentPoint32(dc, str, len, &sizeRect) )
{
wxLogLastError(_T("GetTextExtentPoint32()"));
}
#if !defined(_WIN32_WCE) || (_WIN32_WCE >= 400)
// the result computed by GetTextExtentPoint32() may be too small as it
// accounts for under/overhang of the first/last character while we want
// just the bounding rect for this string so adjust the width as needed
// (using API not available in 2002 SDKs of WinCE)
if ( len > 0 )
{
ABC width;
const wxChar chFirst = *str.begin();
if ( ::GetCharABCWidths(dc, chFirst, chFirst, &width) )
{
if ( width.abcA < 0 )
sizeRect.cx -= width.abcA;
if ( len > 1 )
{
const wxChar chLast = *str.rbegin();
::GetCharABCWidths(dc, chLast, chLast, &width);
}
//else: we already have the width of the last character
if ( width.abcC < 0 )
sizeRect.cx -= width.abcC;
}
//else: GetCharABCWidths() failed, not a TrueType font?
}
#endif // !defined(_WIN32_WCE) || (_WIN32_WCE >= 400)
TEXTMETRIC tm;
::GetTextMetrics(dc, &tm);
if (width)
*width = sizeRect.cx;
if (height)
*height = sizeRect.cy;
if (descent)
*descent = tm.tmDescent;
if (externalLeading)
*externalLeading = tm.tmExternalLeading;
if ( hfontOld )
{
::SelectObject(dc, hfontOld);
}
ReleaseDC(0, dc);
}
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