Add support for opacity property

svn path=/trunk/libcss/; revision=11527

1 files changed, 62 insertions, 0 deletions

diff --git a/src/select/properties/opacity.c b/src/select/properties/opacity.c
new file mode 100644
index 0000000..9ef0998
--- /dev/null
+++ b/src/select/properties/opacity.c
@@ -0,0 +1,62 @@
+/*
+ * This file is part of LibCSS
+ * Licensed under the MIT License,
+ *		  http://www.opensource.org/licenses/mit-license.php
+ * Copyright 2011 John-Mark Bell <jmb@netsurf-browser.org>
+ */
+
+#include "bytecode/bytecode.h"
+#include "bytecode/opcodes.h"
+#include "select/propset.h"
+#include "select/propget.h"
+#include "utils/utils.h"
+
+#include "select/properties/properties.h"
+#include "select/properties/helpers.h"
+
+css_error css__cascade_opacity(uint32_t opv, css_style *style, 
+		css_select_state *state)
+{
+	uint16_t value = CSS_OPACITY_INHERIT;
+	css_fixed opacity = 0;
+
+	if (isInherit(opv) == false) {
+		value = CSS_Z_INDEX_SET;
+
+		opacity = *((css_fixed *) style->bytecode);
+		advance_bytecode(style, sizeof(opacity));
+	}
+
+	if (css__outranks_existing(getOpcode(opv), isImportant(opv), state,
+			isInherit(opv))) {
+		return set_opacity(state->computed, value, opacity);
+	}
+
+	return CSS_OK;
+}
+
+css_error css__set_opacity_from_hint(const css_hint *hint,
+		css_computed_style *style)
+{
+	return set_opacity(style, hint->status, hint->data.fixed);
+}
+
+css_error css__initial_opacity(css_select_state *state)
+{
+	return set_opacity(state->computed, CSS_OPACITY_SET, INTTOFIX(1));
+}
+
+css_error css__compose_opacity(const css_computed_style *parent,
+		const css_computed_style *child,
+		css_computed_style *result)
+{
+	css_fixed opacity = 0;
+	uint8_t type = get_opacity(child, &opacity);
+
+	if (type == CSS_OPACITY_INHERIT) {
+		type = get_opacity(parent, &opacity);
+	}
+
+	return set_opacity(result, type, opacity);
+}
+