[cairo] font metrics in cairo

[Lynn Neir]

Hello...

When getting font metrics (using win32 backend) regardless of hint metrics option, the values are always hinted.   Anyone have any clues?  Looks like in function _cairo_win32_scaled_font_set_metrics (cairo-win32-font.c) this might not be handled correctly?  Any thoughts?

Here is sample code, always getting hinted ascent and descent values regardless of CAIRO_HINT_METRICS_OFF or CAIRO_HINT_METRICS_ON.

#include "stdafx.h"
#include <windows.h>
#include <string>
#include <iostream>

#include <cairo-win32.h>

int _tmain(int argc, _TCHAR* argv[])
{
    HDC hdc = GetDC(0);

    LOGFONT logfont;

    std::wstring fontName(L"Arial");
    memcpy(logfont.lfFaceName, fontName.data(), fontName.length() * sizeof(wchar_t));
    logfont.lfFaceName[fontName.length()] = 0;

    logfont.lfHeight = -256;
    logfont.lfWidth = 0;
    logfont.lfWeight = FW_NORMAL;
    logfont.lfEscapement = 0;
    logfont.lfOrientation = 0;
    logfont.lfUnderline = false;
    logfont.lfStrikeOut = false;
    logfont.lfCharSet = DEFAULT_CHARSET;
    logfont.lfOutPrecision = OUT_TT_ONLY_PRECIS;
    logfont.lfQuality = DEFAULT_QUALITY;
    logfont.lfPitchAndFamily = DEFAULT_PITCH | FF_DONTCARE;

    HFONT font = CreateFontIndirect(&logfont);
    if (!font)
        return 0;

    cairo_font_face_t* fontFace = cairo_win32_font_face_create_for_hfont(font);

    int size = 8;

    cairo_matrix_t sizeMatrix, ctm;
    ctm.xx = ctm.xy = ctm.yx = ctm.yy = ctm.y0 = ctm.x0 = 0.0;
    cairo_matrix_init_identity(&ctm);
    cairo_matrix_init_scale(&sizeMatrix, size, size);

    static cairo_font_options_t* fontOptions = 0;

    fontOptions = cairo_font_options_create();
    //cairo_font_options_set_hint_metrics(fontOptions, CAIRO_HINT_METRICS_ON);
    cairo_font_options_set_hint_metrics(fontOptions, CAIRO_HINT_METRICS_OFF);

    cairo_scaled_font_t* scaledFont = cairo_scaled_font_create(fontFace, &sizeMatrix, &ctm, fontOptions);

    cairo_font_extents_t fontExtents;
    cairo_scaled_font_extents(scaledFont, &fontExtents);
    double ascent = fontExtents.ascent;
    double descent = fontExtents.descent;

    std::cout << "ascent = " << ascent << std::endl;
    std::cout << "descent = " << descent << std::endl;

    cairo_font_face_destroy(fontFace);

    return 0;
}
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