First Commit

libui-ng/windows/fontmatch.cpp

@@ -0,0 +1,61 @@
+// 11 march 2018
+#include "uipriv_windows.hpp"
+#include "attrstr.hpp"
+
+// TODO should be const but then I can't operator[] on it; the real solution is to find a way to do designated array initializers in C++11 but I do not know enough C++ voodoo to make it work (it is possible but no one else has actually done it before)
+static std::map<uiTextItalic, DWRITE_FONT_STYLE> dwriteItalics = {
+	{ uiTextItalicNormal, DWRITE_FONT_STYLE_NORMAL },
+	{ uiTextItalicOblique, DWRITE_FONT_STYLE_OBLIQUE },
+	{ uiTextItalicItalic, DWRITE_FONT_STYLE_ITALIC },
+};
+
+// TODO should be const but then I can't operator[] on it; the real solution is to find a way to do designated array initializers in C++11 but I do not know enough C++ voodoo to make it work (it is possible but no one else has actually done it before)
+static std::map<uiTextStretch, DWRITE_FONT_STRETCH> dwriteStretches = {
+	{ uiTextStretchUltraCondensed, DWRITE_FONT_STRETCH_ULTRA_CONDENSED },
+	{ uiTextStretchExtraCondensed, DWRITE_FONT_STRETCH_EXTRA_CONDENSED },
+	{ uiTextStretchCondensed, DWRITE_FONT_STRETCH_CONDENSED },
+	{ uiTextStretchSemiCondensed, DWRITE_FONT_STRETCH_SEMI_CONDENSED },
+	{ uiTextStretchNormal, DWRITE_FONT_STRETCH_NORMAL },
+	{ uiTextStretchSemiExpanded, DWRITE_FONT_STRETCH_SEMI_EXPANDED },
+	{ uiTextStretchExpanded, DWRITE_FONT_STRETCH_EXPANDED },
+	{ uiTextStretchExtraExpanded, DWRITE_FONT_STRETCH_EXTRA_EXPANDED },
+	{ uiTextStretchUltraExpanded, DWRITE_FONT_STRETCH_ULTRA_EXPANDED },
+};
+
+// for the most part, DirectWrite weights correlate to ours
+// the differences:
+// - Minimum — libui: 0, DirectWrite: 1
+// - Maximum — libui: 1000, DirectWrite: 999
+// TODO figure out what to do about this shorter range (the actual major values are the same (but with different names), so it's just a range issue)
+DWRITE_FONT_WEIGHT uiprivWeightToDWriteWeight(uiTextWeight w)
+{
+	return (DWRITE_FONT_WEIGHT) w;
+}
+
+DWRITE_FONT_STYLE uiprivItalicToDWriteStyle(uiTextItalic i)
+{
+	return dwriteItalics[i];
+}
+
+DWRITE_FONT_STRETCH uiprivStretchToDWriteStretch(uiTextStretch s)
+{
+	return dwriteStretches[s];
+}
+
+void uiprivFontDescriptorFromIDWriteFont(IDWriteFont *font, uiFontDescriptor *uidesc)
+{
+	DWRITE_FONT_STYLE dwitalic;
+	DWRITE_FONT_STRETCH dwstretch;
+
+	dwitalic = font->GetStyle();
+	// TODO reverse the above misalignment if it is corrected
+	uidesc->Weight = (uiTextWeight) (font->GetWeight());
+	dwstretch = font->GetStretch();
+
+	for (uidesc->Italic = uiTextItalicNormal; uidesc->Italic < uiTextItalicItalic; uidesc->Italic++)
+		if (dwriteItalics[uidesc->Italic] == dwitalic)
+			break;
+	for (uidesc->Stretch = uiTextStretchUltraCondensed; uidesc->Stretch < uiTextStretchUltraExpanded; uidesc->Stretch++)
+		if (dwriteStretches[uidesc->Stretch] == dwstretch)
+			break;
+}