[ wxwindows-Bugs-1910313 ] GetTextExtent wrong results for JP font

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Bugs item #1910313, was opened at 2008-03-08 17:54
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Category: wxMac specific
Group: Platform specific
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: David Whetstone (dwhetstone)
Assigned to: Stefan Csomor (csomor)
Summary: GetTextExtent wrong results for JP font

Initial Comment:
GetTextExtent() on wxMac 2.8.7 returns incorrect results for japanese and other similar fonts.  The following code draws two strings, one in roman characters and another in japanese characters.  Each string has a red rectangle drawn to its text extent. While the roman string is neatly encompassed by its rectangle, the rectangle for the japanese string falls far short.  An image of the result is attached.

#include "wx/wx.h"

class TestFrame : public wxFrame
    {
    public:
        TestFrame() : wxFrame(NULL, wxID_ANY, wxT("Test"))
        {
        }
        
        void DrawString(wxDC& dc, const wxString & txt, int vOffset)
        {
            wxSize sz = GetClientSize();
            wxSize ext = dc.GetTextExtent(txt);
            
            int x = wxMax(0, (sz.x-ext.x)/2);
            int y = wxMax(0, (sz.y-ext.y)/2) + vOffset;
            
            dc.SetPen(*wxRED_PEN);
            dc.DrawRectangle(x, y, ext.x, ext.y);
            dc.SetPen(*wxBLACK_PEN);
            dc.DrawText(txt, x, y);
        }
        
        void OnPaint(wxPaintEvent& event)
        {
            wxPaintDC dc(this);
            wxFont font(24, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL);
            font.SetNoAntiAliasing(true);
            dc.SetFont(font);
            DrawString(dc, wxT("ABCDE"), -25);
            DrawString(dc, wxT("カタカナ ひらがな ローマ字"), 25);
        }
        
    private:
        DECLARE_EVENT_TABLE()
    };

BEGIN_EVENT_TABLE(TestFrame, wxFrame)
EVT_PAINT(TestFrame::OnPaint)
END_EVENT_TABLE()

class TestApp : public wxApp
    {
    public:
        bool OnInit()
        {
            TestFrame * frame = new TestFrame();
            frame->Show(true);
            return true;
        }
    };

DECLARE_APP(TestApp)
IMPLEMENT_APP(TestApp)



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