[lasem] svg: start of vertical text support.

[Emmanuel Pacaud <emmanuel src gnome org>]

commit 21add1e5fb6c67de6b6ba24aa6bbcf8cf79a9a29
Author: Emmanuel Pacaud <emmanuel gnome org>
Date:   Tue Sep 25 23:17:51 2012 +0200

    svg: start of vertical text support.

 src/lsmsvgenums.c  |   25 +++++++++++++++++++++++++
 src/lsmsvgenums.h  |   13 +++++++++++++
 src/lsmsvgstyle.c  |    2 +-
 src/lsmsvgstyle.h  |    7 ++++++-
 src/lsmsvgtraits.c |   24 ++++++++++++++++++++++++
 src/lsmsvgtraits.h |    1 +
 src/lsmsvgview.c   |   12 +++++++++++-
 7 files changed, 81 insertions(+), 3 deletions(-)
---
diff --git a/src/lsmsvgenums.c b/src/lsmsvgenums.c
index 70fc58f..bedd9dc 100644
--- a/src/lsmsvgenums.c
+++ b/src/lsmsvgenums.c
@@ -442,3 +442,28 @@ lsm_svg_visibility_from_string (const char *string)
 					   G_N_ELEMENTS (lsm_svg_visibility_strings));
 }
 
+static const char *lsm_svg_writing_mode_strings[] = {
+	"lr-tb",
+	"rl-tb",
+	"tb-rl",
+	"lr",
+	"rl",
+	"tb"
+};
+
+const char *
+lsm_svg_writing_mode_to_string (LsmSvgWritingMode writing_mode)
+{
+	if (writing_mode < 0 || writing_mode > LSM_SVG_WRITING_MODE_TB)
+		return NULL;
+
+	return lsm_svg_writing_mode_strings[writing_mode];
+}
+
+LsmSvgWritingMode
+lsm_svg_writing_mode_from_string (const char *string)
+{
+	return lsm_enum_value_from_string (string, lsm_svg_writing_mode_strings,
+					   G_N_ELEMENTS (lsm_svg_writing_mode_strings));
+}
+
diff --git a/src/lsmsvgenums.h b/src/lsmsvgenums.h
index 112eb92..c176b4c 100644
--- a/src/lsmsvgenums.h
+++ b/src/lsmsvgenums.h
@@ -301,6 +301,19 @@ typedef enum {
 	LSM_SVG_ELEMENT_CATEGORY_ANIMATION		= 1 << 12
 } LsmSvgElementCategory;
 
+typedef enum {
+	LSM_SVG_WRITING_MODE_ERROR = -1,
+	LSM_SVG_WRITING_MODE_LR_TB,
+	LSM_SVG_WRITING_MODE_RL_TB,
+	LSM_SVG_WRITING_MODE_TB_RL,
+	LSM_SVG_WRITING_MODE_LR,
+	LSM_SVG_WRITING_MODE_RL,
+	LSM_SVG_WRITING_MODE_TB
+} LsmSvgWritingMode;
+
+const char * 		lsm_svg_writing_mode_to_string 		(LsmSvgWritingMode writing_mode);
+LsmSvgWritingMode	lsm_svg_writing_mode_from_string	(const char *string);
+
 G_END_DECLS
 
 #endif
diff --git a/src/lsmsvgstyle.c b/src/lsmsvgstyle.c
index 0c691a1..f4914f5 100644
--- a/src/lsmsvgstyle.c
+++ b/src/lsmsvgstyle.c
@@ -393,7 +393,7 @@ static const LsmPropertyInfos lsm_svg_property_infos[] = {
 	{
 		.name = "writing-mode",
 		.id = LSM_PROPERTY_OFFSET_TO_ID (LsmSvgStyle, writing_mode),
-		.trait_class = &lsm_null_trait_class,
+		.trait_class = &lsm_svg_writing_mode_trait_class,
 		.trait_default = "lr-tb"
 	}
 };
diff --git a/src/lsmsvgstyle.h b/src/lsmsvgstyle.h
index 2927364..fc424a5 100644
--- a/src/lsmsvgstyle.h
+++ b/src/lsmsvgstyle.h
@@ -104,6 +104,11 @@ typedef struct {
 	LsmSvgVisibility value;
 } LsmSvgVisibilityProperty;
 
+typedef struct {
+	LsmProperty base;
+	LsmSvgWritingMode value;
+} LsmSvgWritingModeProperty;
+
 struct _LsmSvgStyle {
 	/* Not inherited */
 
@@ -170,7 +175,7 @@ struct _LsmSvgStyle {
 	LsmProperty *			text_rendering;
 	LsmSvgVisibilityProperty *	visibility;
 	LsmProperty *			word_spacing;
-	LsmProperty *			writing_mode;
+	LsmSvgWritingModeProperty *	writing_mode;
 };
 
 void 		lsm_svg_property_bag_set_property 	(LsmPropertyBag *property_bag,
diff --git a/src/lsmsvgtraits.c b/src/lsmsvgtraits.c
index e11bbe6..3357f4d 100644
--- a/src/lsmsvgtraits.c
+++ b/src/lsmsvgtraits.c
@@ -965,3 +965,27 @@ const LsmTraitClass lsm_svg_one_or_two_double_trait_class = {
 	.to_string = lsm_svg_one_or_two_double_trait_to_string
 };
 
+static gboolean
+lsm_svg_writing_mode_trait_from_string (LsmTrait *abstract_trait, char *string)
+{
+	LsmSvgDisplay *trait = (LsmSvgDisplay *) abstract_trait;
+
+	*trait = lsm_svg_writing_mode_from_string (string);
+
+	return *trait >= 0;
+}
+
+char *
+lsm_svg_writing_mode_trait_to_string (LsmTrait *abstract_trait)
+{
+	LsmSvgDisplay *trait = (LsmSvgDisplay *) abstract_trait;
+
+	return g_strdup (lsm_svg_writing_mode_to_string (*trait));
+}
+
+const LsmTraitClass lsm_svg_writing_mode_trait_class = {
+	.size = sizeof (LsmSvgWritingMode),
+	.from_string = lsm_svg_writing_mode_trait_from_string,
+	.to_string = lsm_svg_writing_mode_trait_to_string
+};
+
diff --git a/src/lsmsvgtraits.h b/src/lsmsvgtraits.h
index 2ea2f44..95f362c 100644
--- a/src/lsmsvgtraits.h
+++ b/src/lsmsvgtraits.h
@@ -92,6 +92,7 @@ extern const LsmTraitClass lsm_svg_preserve_aspect_ratio_trait_class;
 extern const LsmTraitClass lsm_svg_spread_method_trait_class;
 extern const LsmTraitClass lsm_svg_text_anchor_trait_class;
 extern const LsmTraitClass lsm_svg_visibility_trait_class;
+extern const LsmTraitClass lsm_svg_writing_mode_trait_class;
 
 G_END_DECLS
 
diff --git a/src/lsmsvgview.c b/src/lsmsvgview.c
index 09c2b44..b83cb44 100644
--- a/src/lsmsvgview.c
+++ b/src/lsmsvgview.c
@@ -1475,7 +1475,17 @@ lsm_svg_view_show_text (LsmSvgView *view, char const *string, double x, double y
 	path_infos.extents.y2 = y1 + pango_units_to_double (rectangle.height);
 	path_infos.pango_layout = pango_layout;
 
-	process_path (view, &path_infos);
+	if (style->writing_mode->value == LSM_SVG_WRITING_MODE_TB ||
+	    style->writing_mode->value == LSM_SVG_WRITING_MODE_TB_RL) {
+
+		cairo_save (view->dom_view.cairo);
+		cairo_rotate (view->dom_view.cairo, M_PI / 2.0);
+
+		process_path (view, &path_infos);
+
+		cairo_restore (view->dom_view.cairo);
+	} else
+		process_path (view, &path_infos);
 
 	if (pango_layout != view->pango_layout) {
 		lsm_debug_render ("[LsmSvgView::show_text] Free the child pango layout");