From 3a852ae7fe6edfaadd75625d27515a3689503395 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Wed, 3 Nov 2010 16:37:24 -0400
Subject: [PATCH] Save general category and combining class in the buffer for
 reuse

---
 src/hb-ot-layout-private.hh       |  3 ++-
 src/hb-ot-shape-complex-arabic.cc | 16 ++++++++++------
 src/hb-ot-shape-private.hh        |  6 ++++++
 src/hb-ot-shape.cc                | 26 +++++++++++++++++++++-----
 4 files changed, 39 insertions(+), 12 deletions(-)

diff --git a/src/hb-ot-layout-private.hh b/src/hb-ot-layout-private.hh
index 4d8a855..b0088fb 100644
--- a/src/hb-ot-layout-private.hh
+++ b/src/hb-ot-layout-private.hh
@@ -39,9 +39,10 @@ HB_BEGIN_DECLS
 
 
 /* buffer var allocations */
-#define props_cache() var1.u16[0] /* glyph_props cache */
+#define props_cache() var1.u16[1] /* glyph_props cache */
 
 
+/* XXX cleanup */
 typedef enum {
   HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED	= 0x0001,
   HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH	= 0x0002,
diff --git a/src/hb-ot-shape-complex-arabic.cc b/src/hb-ot-shape-complex-arabic.cc
index 2401c36..a63060c 100644
--- a/src/hb-ot-shape-complex-arabic.cc
+++ b/src/hb-ot-shape-complex-arabic.cc
@@ -28,6 +28,11 @@
 
 HB_BEGIN_DECLS
 
+
+/* buffer var allocations */
+#define arabic_shaping_action() var2.u32 /* arabic shaping action */
+
+
 /*
  * Bits used in the joining tables
  */
@@ -686,20 +691,19 @@ _hb_ot_shape_complex_setup_masks_arabic	(hb_ot_shape_context_t *c)
 
   for (unsigned int i = 0; i < count; i++)
   {
-
-    unsigned int this_type = get_joining_type (c->buffer->info[i].codepoint, c->buffer->unicode->v.get_general_category (c->buffer->info[i].codepoint));
+    unsigned int this_type = get_joining_type (c->buffer->info[i].codepoint, (hb_category_t) c->buffer->info[i].general_category());
 
     if (unlikely (this_type == JOINING_TYPE_T)) {
-      c->buffer->info[i].var2.u32 = NONE;
+      c->buffer->info[i].arabic_shaping_action() = NONE;
       continue;
     }
 
     const arabic_state_table_entry *entry = &arabic_state_table[state][this_type];
 
     if (entry->prev_action != NONE)
-      c->buffer->info[prev].var2.u32 = entry->prev_action;
+      c->buffer->info[prev].arabic_shaping_action() = entry->prev_action;
 
-    c->buffer->info[i].var2.u32 = entry->curr_action;
+    c->buffer->info[i].arabic_shaping_action() = entry->curr_action;
 
     prev = i;
     state = entry->next_state;
@@ -711,7 +715,7 @@ _hb_ot_shape_complex_setup_masks_arabic	(hb_ot_shape_context_t *c)
     mask_array[i] = c->plan->map.get_1_mask (arabic_syriac_features[i]);
 
   for (unsigned int i = 0; i < count; i++)
-    c->buffer->info[i].mask |= mask_array[c->buffer->info[i].var2.u32];
+    c->buffer->info[i].mask |= mask_array[c->buffer->info[i].arabic_shaping_action()];
 }
 
 
diff --git a/src/hb-ot-shape-private.hh b/src/hb-ot-shape-private.hh
index 0794fbf..6197406 100644
--- a/src/hb-ot-shape-private.hh
+++ b/src/hb-ot-shape-private.hh
@@ -35,6 +35,12 @@
 
 HB_BEGIN_DECLS
 
+
+/* buffer var allocations */
+#define general_category() var1.u8[0] /* unicode general_category (hb_category_t) */
+#define combining_class() var1.u8[1] /* unicode combining_class (uint8_t) */
+
+
 enum hb_ot_complex_shaper_t {
   hb_ot_complex_shaper_none,
   hb_ot_complex_shaper_arabic
diff --git a/src/hb-ot-shape.cc b/src/hb-ot-shape.cc
index a4e568d..346cb37 100644
--- a/src/hb-ot-shape.cc
+++ b/src/hb-ot-shape.cc
@@ -86,7 +86,7 @@ hb_ot_shape_setup_masks (hb_ot_shape_context_t *c)
   hb_mask_t global_mask = c->plan->map.get_global_mask ();
   c->buffer->reset_masks (global_mask);
 
-  hb_ot_shape_complex_setup_masks (c);
+  hb_ot_shape_complex_setup_masks (c); /* BUFFER: Clobbers var2 */
 
   for (unsigned int i = 0; i < c->num_user_features; i++)
   {
@@ -141,11 +141,25 @@ is_variation_selector (hb_codepoint_t unicode)
 }
 
 static void
+hb_set_unicode_props (hb_ot_shape_context_t *c)
+{
+  hb_unicode_get_general_category_func_t get_general_category = c->buffer->unicode->v.get_general_category;
+  hb_unicode_get_combining_class_func_t get_combining_class = c->buffer->unicode->v.get_combining_class;
+  hb_glyph_info_t *info = c->buffer->info;
+
+  unsigned int count = c->buffer->len;
+  for (unsigned int i = 1; i < count; i++) {
+    info[i].general_category() = get_general_category (info[i].codepoint);
+    info[i].combining_class() = get_combining_class (info[i].codepoint);
+  }
+}
+
+static void
 hb_form_clusters (hb_ot_shape_context_t *c)
 {
   unsigned int count = c->buffer->len;
   for (unsigned int i = 1; i < count; i++)
-    if (c->buffer->unicode->v.get_general_category (c->buffer->info[i].codepoint) == HB_CATEGORY_NON_SPACING_MARK)
+    if (c->buffer->info[i].general_category() == HB_CATEGORY_NON_SPACING_MARK)
       c->buffer->info[i].cluster = c->buffer->info[i - 1].cluster;
 }
 
@@ -282,11 +296,13 @@ hb_ot_shape_execute_internal (hb_ot_shape_context_t *c)
   /* Save the original direction, we use it later. */
   c->original_direction = c->buffer->props.direction;
 
-  hb_form_clusters (c);
+  hb_reset_glyph_infos (c); /* BUFFER: Clear buffer var1 and var2 */
 
-  hb_ot_shape_setup_masks (c);
+  hb_set_unicode_props (c); /* BUFFER: Set general_category and combining_class in var1 */
+
+  hb_form_clusters (c);
 
-  hb_reset_glyph_infos (c);
+  hb_ot_shape_setup_masks (c); /* BUFFER: Clobbers var2 */
 
   /* SUBSTITUTE */
   {
-- 
2.7.4