First Commit

libui-ng/unix/attrstr.c

@@ -0,0 +1,145 @@
+// 12 february 2017
+#include "uipriv_unix.h"
+#include "attrstr.h"
+
+// TODO pango alpha attributes turn 0 into 65535 :|
+
+// TODO make this name less generic?
+struct foreachParams {
+	PangoAttrList *attrs;
+};
+
+static void addattr(struct foreachParams *p, size_t start, size_t end, PangoAttribute *attr)
+{
+	if (attr == NULL)		// in case of a future attribute
+		return;
+	attr->start_index = start;
+	attr->end_index = end;
+	pango_attr_list_insert(p->attrs, attr);
+}
+
+static uiForEach processAttribute(const uiAttributedString *s, const uiAttribute *attr, size_t start, size_t end, void *data)
+{
+	struct foreachParams *p = (struct foreachParams *) data;
+	double r, g, b, a;
+	PangoUnderline underline;
+	uiUnderlineColor colorType;
+	const uiOpenTypeFeatures *features;
+	GString *featurestr;
+
+	switch (uiAttributeGetType(attr)) {
+	case uiAttributeTypeFamily:
+		addattr(p, start, end,
+			pango_attr_family_new(uiAttributeFamily(attr)));
+		break;
+	case uiAttributeTypeSize:
+		addattr(p, start, end,
+			pango_attr_size_new(cairoToPango(uiAttributeSize(attr))));
+		break;
+	case uiAttributeTypeWeight:
+		// TODO reverse the misalignment from drawtext.c if it is corrected 
+		addattr(p, start, end,
+			pango_attr_weight_new(uiprivWeightToPangoWeight(uiAttributeWeight(attr))));
+		break;
+	case uiAttributeTypeItalic:
+		addattr(p, start, end,
+			pango_attr_style_new(uiprivItalicToPangoStyle(uiAttributeItalic(attr))));
+		break;
+	case uiAttributeTypeStretch:
+		addattr(p, start, end,
+			pango_attr_stretch_new(uiprivStretchToPangoStretch(uiAttributeStretch(attr))));
+		break;
+	case uiAttributeTypeColor:
+		uiAttributeColor(attr, &r, &g, &b, &a);
+		addattr(p, start, end,
+			pango_attr_foreground_new(
+				(guint16) (r * 65535.0),
+				(guint16) (g * 65535.0),
+				(guint16) (b * 65535.0)));
+		addattr(p, start, end,
+			uiprivFUTURE_pango_attr_foreground_alpha_new(
+				(guint16) (a * 65535.0)));
+		break;
+	case uiAttributeTypeBackground:
+		// TODO make sure this works properly with line paragraph spacings (after figuring out what that means, of course)
+		uiAttributeColor(attr, &r, &g, &b, &a);
+		addattr(p, start, end,
+			pango_attr_background_new(
+				(guint16) (r * 65535.0),
+				(guint16) (g * 65535.0),
+				(guint16) (b * 65535.0)));
+		addattr(p, start, end,
+			uiprivFUTURE_pango_attr_background_alpha_new(
+				(guint16) (a * 65535.0)));
+		break;
+	case uiAttributeTypeUnderline:
+		switch (uiAttributeUnderline(attr)) {
+		case uiUnderlineNone:
+			underline = PANGO_UNDERLINE_NONE;
+			break;
+		case uiUnderlineSingle:
+			underline = PANGO_UNDERLINE_SINGLE;
+			break;
+		case uiUnderlineDouble:
+			underline = PANGO_UNDERLINE_DOUBLE;
+			break;
+		case uiUnderlineSuggestion:
+			underline = PANGO_UNDERLINE_ERROR;
+			break;
+		}
+		addattr(p, start, end,
+			pango_attr_underline_new(underline));
+		break;
+	case uiAttributeTypeUnderlineColor:
+		uiAttributeUnderlineColor(attr, &colorType, &r, &g, &b, &a);
+		switch (colorType) {
+		case uiUnderlineColorCustom:
+			addattr(p, start, end,
+				pango_attr_underline_color_new(
+					(guint16) (r * 65535.0),
+					(guint16) (g * 65535.0),
+					(guint16) (b * 65535.0)));
+			break;
+		case uiUnderlineColorSpelling:
+			// TODO GtkTextView style property error-underline-color
+			addattr(p, start, end,
+				pango_attr_underline_color_new(65535, 0, 0));
+			break;
+		case uiUnderlineColorGrammar:
+			// TODO find a more appropriate color
+			addattr(p, start, end,
+				pango_attr_underline_color_new(0, 65535, 0));
+			break;
+		case uiUnderlineColorAuxiliary:
+			// TODO find a more appropriate color
+			addattr(p, start, end,
+				pango_attr_underline_color_new(0, 0, 65535));
+			break;
+		}
+		break;
+	case uiAttributeTypeFeatures:
+		// only generate an attribute if the features object is not NULL
+		// TODO state that this is allowed
+		features = uiAttributeFeatures(attr);
+		if (features == NULL)
+			break;
+		featurestr = uiprivOpenTypeFeaturesToPangoCSSFeaturesString(features);
+		addattr(p, start, end,
+			uiprivFUTURE_pango_attr_font_features_new(featurestr->str));
+		g_string_free(featurestr, TRUE);
+		break;
+	default:
+		// TODO complain
+		;
+	}
+	return uiForEachContinue;
+}
+
+PangoAttrList *uiprivAttributedStringToPangoAttrList(uiDrawTextLayoutParams *p)
+{
+	struct foreachParams fep;
+
+	fep.attrs = pango_attr_list_new();
+	uiAttributedStringForEachAttribute(p->String, processAttribute, &fep);
+	return fep.attrs;
+}