From b230fafd64ed4a23fdeb1c16a991db2f42d6c8a4 Mon Sep 17 00:00:00 2001
From: John Mark Bell <jmb@netsurf-browser.org>
Date: Fri, 6 Feb 2009 14:08:50 +0000
Subject: Some property accessors. Define css_unit type.

svn path=/trunk/libcss/; revision=6372
---
 include/libcss/computed.h | 124 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 122 insertions(+), 2 deletions(-)

(limited to 'include/libcss/computed.h')

diff --git a/include/libcss/computed.h b/include/libcss/computed.h
index 18230b9..15f5941 100644
--- a/include/libcss/computed.h
+++ b/include/libcss/computed.h
@@ -70,7 +70,7 @@ typedef struct css_computed_uncommon {
  *
  * Bit allocations:
  *
- *    01234567
+ *    76543210
  *  1 llllllcc	letter-spacing | outline-color
  *  2 ooooooob	outline-width  | border-spacing
  *  3 bbbbbbbb	border-spacing
@@ -192,7 +192,7 @@ struct css_computed_style {
  *
  * Bit allocations:
  *
- *    01234567
+ *    76543210
  *  1 vvvvvvvv	vertical-align
  *  2 ffffffff	font-size
  *  3 ttttttti	border-top-width    | background-image
@@ -287,4 +287,124 @@ css_error css_computed_style_compose(const css_computed_style *parent,
 		const css_computed_style *child,
 		css_computed_style *result);
 
+/******************************************************************************
+ * Property accessors below here                                              *
+ ******************************************************************************/
+
+#define LETTER_SPACING_INDEX 0
+#define LETTER_SPACING_SHIFT 2
+#define LETTER_SPACING_MASK  0xfc
+static inline uint8_t css_computed_letter_spacing(
+		const css_computed_style *style, 
+		css_fixed *length, css_unit *unit)
+{
+	if (style->uncommon != NULL) {
+		uint8_t bits = style->uncommon->bits[LETTER_SPACING_INDEX];
+		bits &= LETTER_SPACING_MASK;
+		bits >>= LETTER_SPACING_SHIFT;
+
+		/* 6bits: uuuutt : unit | type */
+
+		if ((bits & 3) == CSS_LETTER_SPACING_SET) {
+			*length = style->uncommon->letter_spacing;
+			*unit = bits >> 2;
+			return CSS_LETTER_SPACING_SET;
+		}
+	}
+
+	return CSS_LETTER_SPACING_NORMAL;
+}
+#undef LETTER_SPACING_MASK
+#undef LETTER_SPACING_SHIFT
+#undef LETTER_SPACING_INDEX
+
+#define OUTLINE_COLOR_INDEX 0
+#define OUTLINE_COLOR_SHIFT 0
+#define OUTLINE_COLOR_MASK  0x3
+static inline uint8_t css_computed_outline_color(
+		const css_computed_style *style, css_color *color)
+{
+	if (style->uncommon != NULL) {
+		uint8_t bits = style->uncommon->bits[OUTLINE_COLOR_INDEX];
+		bits &= OUTLINE_COLOR_MASK;
+		bits >>= OUTLINE_COLOR_SHIFT;
+
+		/* 2bits: tt : type */
+
+		if ((bits & 3) == CSS_OUTLINE_COLOR_COLOR) {
+			*color = style->uncommon->outline_color;
+			return CSS_OUTLINE_COLOR_COLOR;
+		}
+	}
+
+	return CSS_OUTLINE_COLOR_INVERT;
+}
+#undef OUTLINE_COLOR_MASK
+#undef OUTLINE_COLOR_SHIFT
+#undef OUTLINE_COLOR_INDEX
+
+#define OUTLINE_WIDTH_INDEX 1
+#define OUTLINE_WIDTH_SHIFT 1
+#define OUTLINE_WIDTH_MASK  0xfe
+static inline uint8_t css_computed_outline_width(
+		const css_computed_style *style, 
+		css_fixed *length, css_unit *unit)
+{
+	if (style->uncommon != NULL) {
+		uint8_t bits = style->uncommon->bits[OUTLINE_WIDTH_INDEX];
+		bits &= OUTLINE_WIDTH_MASK;
+		bits >>= OUTLINE_WIDTH_SHIFT;
+
+		/* 7bits: uuuuttt : unit | type */
+
+		if ((bits & 7) == CSS_OUTLINE_WIDTH_WIDTH) {
+			*length = style->uncommon->outline_width;
+			*unit = bits >> 3;
+			return CSS_OUTLINE_WIDTH_WIDTH;
+		} else
+			return (bits & 7);
+	}
+
+	return CSS_OUTLINE_WIDTH_MEDIUM;
+}
+#undef OUTLINE_WIDTH_MASK
+#undef OUTLINE_WIDTH_SHIFT
+#undef OUTLINE_WIDTH_INDEX
+
+#define BORDER_SPACING_INDEX 2
+#define BORDER_SPACING_SHIFT 0
+#define BORDER_SPACING_MASK  0xff
+static inline uint8_t css_computed_border_spacing(
+		const css_computed_style *style, 
+		css_fixed *hlength, css_unit *hunit,
+		css_fixed *vlength, css_unit *vunit)
+{
+	if (style->uncommon != NULL) {
+		uint8_t bits = style->uncommon->bits[BORDER_SPACING_INDEX];
+		bits &= BORDER_SPACING_MASK;
+		bits >>= BORDER_SPACING_SHIFT;
+
+		/* There's actually a ninth bit (bit 0 of the previous byte)
+		 * This encodes SET/INHERIT. Given that we must be SET here,
+		 * we don't bother looking at it */
+
+		/* 8bits: hhhhvvvv : hunit | vunit */
+
+		*hlength = style->uncommon->border_spacing[0];
+		*hunit = bits >> 4;
+
+		*vlength = style->uncommon->border_spacing[1];
+		*vunit = bits & 0xf;
+	} else {
+		*hlength = *vlength = 0;
+		*hunit = *vunit = CSS_UNIT_PX;
+	}
+
+	return CSS_BORDER_SPACING_SET;
+}
+#undef BORDER_SPACING_MASK
+#undef BORDER_SPACING_SHIFT
+#undef BORDER_SPACING_INDEX
+
+
 #endif
-- 
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