Add callback to make client compute the font size.

Some progress towards computing absolute values.

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

2 files changed, 48 insertions, 11 deletions

diff --git a/src/select/computed.c b/src/select/computed.c
index d8007c1..4c58102 100644
--- a/src/select/computed.c
+++ b/src/select/computed.c
@@ -7,8 +7,7 @@
 
 #include <string.h>
 
-#include <libcss/computed.h>
-
+#include "select/computed.h"
 #include "select/dispatch.h"
 #include "utils/utils.h"
 
@@ -94,9 +93,11 @@ css_error css_computed_style_destroy(css_computed_style *style)
 /**
  * Compose two computed styles
  *
- * \param parent  Parent style
- * \param child   Child style
- * \param result  Pointer to style to compose into
+ * \param parent             Parent style
+ * \param child              Child style
+ * \param compute_font_size  Function to compute an absolute font size
+ * \param pw                 Client data for compute_font_size
+ * \param result             Pointer to style to compose into
  * \return CSS_OK on success, appropriate error otherwise.
  *
  * Precondition: Parent is a fully composed style (thus has no properties
@@ -104,6 +105,9 @@ css_error css_computed_style_destroy(css_computed_style *style)
  */
 css_error css_computed_style_compose(const css_computed_style *parent,
 		const css_computed_style *child,
+		css_error (*compute_font_size)(void *pw,
+				const css_hint *parent, css_hint *size),
+		void *pw,
 		css_computed_style *result)
 {
 	css_error error = CSS_OK;
@@ -131,6 +135,31 @@ css_error css_computed_style_compose(const css_computed_style *parent,
 			break;
 	}
 
-	return error;
+	/* Finally, compute absolute values for everything */
+	return compute_absolute_values(result, compute_font_size, pw);
+}
+
+/******************************************************************************
+ * Library internals                                                          *
+ ******************************************************************************/
+
+/**
+ * Compute the absolute values of a style
+ *
+ * \param style              Computed style to process
+ * \param compute_font_size  Callback to calculate an absolute font-size
+ * \param pw                 Private word for callback
+ * \return CSS_OK on success.
+ */
+css_error compute_absolute_values(css_computed_style *style,
+		css_error (*compute_font_size)(void *pw, 
+			const css_hint *parent, css_hint *size),
+		void *pw)
+{
+	UNUSED(style);
+	UNUSED(compute_font_size);
+	UNUSED(pw);
+
+	return CSS_OK;
 }
 
diff --git a/src/select/select.c b/src/select/select.c
index c839be1..f94b2c2 100644
--- a/src/select/select.c
+++ b/src/select/select.c
@@ -8,12 +8,12 @@
 #include <assert.h>
 #include <string.h>
 
-#include <libcss/computed.h>
 #include <libcss/select.h>
 
 #include "bytecode/bytecode.h"
 #include "bytecode/opcodes.h"
 #include "stylesheet.h"
+#include "select/computed.h"
 #include "select/dispatch.h"
 #include "select/hash.h"
 #include "select/propset.h"
@@ -323,10 +323,7 @@ css_error css_select_style(css_select_ctx *ctx, void *node,
 	}
 
 	/* Take account of presentational hints and fix up any remaining
-	 * unset properties.
-	 * Those properties which are inherited need to be set as inherit.
-	 * Those which are not inherited need to be set to their default value.
-	 */
+	 * unset properties. */
 	for (i = 0; i < CSS_N_PROPERTIES; i++) {
 		/* If the existing property value came from an author 
 		 * stylesheet or a user sheet using !important, then leave 
@@ -349,6 +346,17 @@ css_error css_select_style(css_select_ctx *ctx, void *node,
 		}
 	}
 
+	/* If this is the root element, then we must ensure that all
+	 * length values are absolute, display and float are correctly 
+	 * computed, and the default border-{top,right,bottom,left}-color 
+	 * is set to the computed value of color. */
+	if (parent == NULL) {
+		error = compute_absolute_values(result, 
+				handler->compute_font_size, pw);
+		if (error != CSS_OK)
+			goto cleanup;
+	}
+
 	error = CSS_OK;
 cleanup:
         if (ctx->sheets[0] != NULL) {