Add callback to make client compute the font size.

Some progress towards computing absolute values.

svn path=/trunk/libcss/; revision=8311

1 files changed, 66 insertions, 1 deletions

diff --git a/test/select-auto.c b/test/select-auto.c
index fed6204..c52cb0a 100644
--- a/test/select-auto.c
+++ b/test/select-auto.c
@@ -116,6 +116,8 @@ static css_error node_presentational_hint(void *pw, void *node,
 		uint32_t property, css_hint *hint);
 static css_error ua_default_for_property(void *pw, uint32_t property,
 		css_hint *hint);
+static css_error compute_font_size(void *pw, const css_hint *parent,
+		css_hint *size);
 
 static css_select_handler select_handler = {
 	node_name,
@@ -138,7 +140,8 @@ static css_select_handler select_handler = {
 	node_is_focus,
 	node_is_lang,
 	node_presentational_hint,
-	ua_default_for_property
+	ua_default_for_property,
+	compute_font_size
 };
 
 static void *myrealloc(void *data, size_t len, void *pw)
@@ -1110,3 +1113,65 @@ css_error ua_default_for_property(void *pw, uint32_t property, css_hint *hint)
 	return CSS_OK;
 }
 
+css_error compute_font_size(void *pw, const css_hint *parent, css_hint *size)
+{
+	static css_hint_length sizes[] = {
+		{ FLTTOFIX(6.75), CSS_UNIT_PT },
+		{ FLTTOFIX(7.50), CSS_UNIT_PT },
+		{ FLTTOFIX(9.75), CSS_UNIT_PT },
+		{ FLTTOFIX(12.0), CSS_UNIT_PT },
+		{ FLTTOFIX(13.5), CSS_UNIT_PT },
+		{ FLTTOFIX(18.0), CSS_UNIT_PT },
+		{ FLTTOFIX(24.0), CSS_UNIT_PT }
+	};
+	const css_hint_length *parent_size;
+
+	UNUSED(pw);
+
+	/* Grab parent size, defaulting to medium if none */
+	if (parent == NULL) {
+		parent_size = &sizes[CSS_FONT_SIZE_MEDIUM - 1];
+	} else {
+		assert(parent->status == CSS_FONT_SIZE_DIMENSION);
+		assert(parent->data.length.unit != CSS_UNIT_EM);
+		assert(parent->data.length.unit != CSS_UNIT_EX);
+		parent_size = &parent->data.length;
+	}
+
+	assert(size->status != CSS_FONT_SIZE_INHERIT);
+
+	if (size->status < CSS_FONT_SIZE_LARGER) {
+		/* Keyword -- simple */
+		size->data.length = sizes[size->status - 1];
+	} else if (size->status == CSS_FONT_SIZE_LARGER) {
+		/** \todo Step within table, if appropriate */
+		size->data.length.value = 
+				FMUL(parent_size->value, FLTTOFIX(1.2));
+		size->data.length.unit = parent_size->unit;
+	} else if (size->status == CSS_FONT_SIZE_SMALLER) {
+		/** \todo Step within table, if appropriate */
+		size->data.length.value = 
+				FMUL(parent_size->value, FLTTOFIX(1.2));
+		size->data.length.unit = parent_size->unit;
+	} else if (size->data.length.unit == CSS_UNIT_EM ||
+			size->data.length.unit == CSS_UNIT_EX) {
+		size->data.length.value = 
+			FMUL(size->data.length.value, parent_size->value);
+
+		if (size->data.length.unit == CSS_UNIT_EX) {
+			size->data.length.value = FMUL(size->data.length.value,
+					FLTTOFIX(0.6));
+		}
+
+		size->data.length.unit = parent_size->unit;
+	} else if (size->data.length.unit == CSS_UNIT_PCT) {
+		size->data.length.value = FDIV(FMUL(size->data.length.value,
+				parent_size->value), FLTTOFIX(100));
+		size->data.length.unit = parent_size->unit;
+	}
+
+	size->status = CSS_FONT_SIZE_DIMENSION;
+
+	return CSS_OK;
+}
+