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Implemented metrics on Pango.

This commit is contained in:
Pietro Gagliardi 2016-01-12 23:33:50 -05:00
parent d6063394ee
commit 776be61c45
1 changed files with 19 additions and 16 deletions
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35
unix/draw.c
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@ -483,22 +483,6 @@ void uiDrawFreeFontFamilies(uiDrawFontFamilies *ff)
uiFree(ff); uiFree(ff);
} }
double uiDrawTextSizeToPoints(double textSize)
{
gint pangoSize;
pangoSize = (gint) (textSize * PANGO_SCALE);
return ((double) pangoSize) / PANGO_SCALE;
}
double uiDrawPointsToTextSize(double points)
{
// yeah, as far as I can tell the two functions are equivalent
// TODO verify
// TODO make sure they aren't just equivalent
return uiDrawTextSizeToPoints(points);
}
struct uiDrawTextFont { struct uiDrawTextFont {
PangoFont *f; PangoFont *f;
}; };
@ -602,6 +586,25 @@ void uiDrawTextFontDescribe(uiDrawTextFont *font, uiDrawTextFontDescriptor *desc
pango_font_description_free(pdesc); pango_font_description_free(pdesc);
} }
// See https://developer.gnome.org/pango/1.30/pango-Cairo-Rendering.html#pango-Cairo-Rendering.description
// Note that we convert to double before dividing to make sure the floating-point stuff is right
#define pangoToCairo(pango) (((double) (pango)) / PANGO_SCALE)
// TODO this isn't enough; pango adds extra space to each layout
void uiDrawTextFontGetMetrics(uiDrawTextFont *font, uiDrawTextFontMetrics *metrics)
{
PangoFontMetrics *pm;
pm = pango_font_get_metrics(font->f, NULL);
metrics->Ascent = pangoToCairo(pango_font_metrics_get_ascent(pm));
metrics->Descent = pangoToCairo(pango_font_metrics_get_descent(pm));
// Pango doesn't seem to expose this :( Use 0 and hope for the best.
metrics->Leading = 0;
metrics->UnderlinePos = pangoToCairo(pango_font_metrics_get_underline_position(pm));
metrics->UnderlineThickness = pangoToCairo(pango_font_metrics_get_underline_thickness(pm));
pango_font_metrics_unref(pm);
}
// note: PangoCairoLayouts are tied to a given cairo_t, so we can't store one in this device-independent structure // note: PangoCairoLayouts are tied to a given cairo_t, so we can't store one in this device-independent structure
struct uiDrawTextLayout { struct uiDrawTextLayout {
char *s; char *s;