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Some more TODO resolution in the GTK+ backend.

This commit is contained in:
Pietro Gagliardi 2016-05-22 20:35:40 -04:00
parent 61185072f7
commit 9b4a13e9b3
2 changed files with 6 additions and 5 deletions
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1
doc/drawtext Normal file
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@ -0,0 +1 @@
on some unix systems, alpha blending fonts may not be available; this depends on your installed version of pango and is determined at runtime by libui

10
unix/drawtext.c
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@ -87,9 +87,9 @@ static const PangoStretch pangoStretches[] = {
// we need a context for a few things
// the documentation suggests creating cairo_t-specific, GdkScreen-specific, or even GtkWidget-specific contexts, but we can't really do that because we want our uiDrawTextFonts and uiDrawTextLayouts to be context-independent
// so this will have to do
// TODO really see if there's a better way instead; what do GDK and GTK+ do internally? gdk_pango_context_get()?
#define mkGenericPangoCairoContext() (pango_font_map_create_context(pango_cairo_font_map_get_default()))
// we could use pango_font_map_create_context(pango_cairo_font_map_get_default()) but that will ignore GDK-specific settings
// so let's use gdk_pango_context_get() instead; even though it's for the default screen only, it's good enough for us
#define mkGenericPangoCairoContext() (gdk_pango_context_get())
PangoFont *pangoDescToPangoFont(PangoFontDescription *pdesc)
{
@ -251,9 +251,10 @@ void uiDrawTextLayoutExtents(uiDrawTextLayout *layout, double *width, double *he
PangoRectangle logical;
// in this case, the context is necessary to create the layout
// the layout takes a ref on the context so we can unref it afterward
context = mkGenericPangoCairoContext();
pl = pango_layout_new(context);
// TODO g_object_unref() context?
g_object_unref(context);
prepareLayout(layout, pl);
pango_layout_get_extents(pl, NULL, &logical);
@ -287,7 +288,6 @@ static void addAttr(uiDrawTextLayout *layout, PangoAttribute *attr, intmax_t sta
// these attributes are only supported on 1.38 and higher; we need to support 1.36
// use dynamic linking to make them work at least on newer systems
// TODO warn programmers
static PangoAttribute *(*newFGAlphaAttr)(guint16 alpha) = NULL;
static gboolean tried138 = FALSE;