[color] Rename / reorder a bit

Implement has_data() for realz.

src/hb-ot-color-colr-table.hh

@@ -96,6 +96,8 @@ struct COLR
 {
   static const hb_tag_t tableTag = HB_OT_TAG_COLR;
 
+  inline bool has_data (void) const { return numBaseGlyphs; }
+
   inline bool get_base_glyph_record (hb_codepoint_t glyph_id,
 				     unsigned int *first_layer /* OUT */,
 				     unsigned int *num_layers /* OUT */) const

src/hb-ot-color-cpal-table.hh

@@ -112,6 +112,8 @@ struct CPAL
 {
   static const hb_tag_t tableTag = HB_OT_TAG_CPAL;
 
+  inline bool has_data (void) const { return numPalettes; }
+
   inline bool sanitize (hb_sanitize_context_t *c) const
   {
     TRACE_SANITIZE (this);

src/hb-ot-color.cc

@@ -77,32 +77,23 @@ _get_svg (hb_face_t *face)
 }
 #endif
 
-/**
- * hb_ot_color_has_cpal_data:
- * @face: a font face.
- *
- * Returns: whether CPAL table is available.
- *
- * Since: REPLACEME
+/*
+ * CPAL
  */
-hb_bool_t
-hb_ot_color_has_cpal_data (hb_face_t *face)
-{
-  return &_get_cpal (face) != &Null(OT::CPAL);
-}
+
 
 /**
- * hb_ot_color_has_colr_data:
+ * hb_ot_color_has_palettes:
  * @face: a font face.
  *
- * Returns: whether COLR table is available.
+ * Returns: whether CPAL table is available.
  *
  * Since: REPLACEME
  */
 hb_bool_t
-hb_ot_color_has_colr_data (hb_face_t *face)
+hb_ot_color_has_palettes (hb_face_t *face)
 {
-  return &_get_colr (face) != &Null(OT::COLR);
+  return _get_cpal (face).has_data ();
 }
 
 /**
@@ -215,6 +206,43 @@ hb_ot_color_get_palette_colors (hb_face_t      *face,
   return cpal.get_palette_entries_count ();
 }
 
+/**
+ * hb_ot_color_get_palette_flags:
+ * @face:    a font face
+ * @palette: the index of the color palette whose flags are being requested
+ *
+ * Returns: the flags for the requested color palette.  If @face has no colors,
+ * or if @palette is not between 0 and hb_ot_color_get_palette_count(),
+ * the result is #HB_OT_COLOR_PALETTE_FLAG_DEFAULT.
+ *
+ * Since: REPLACEME
+ */
+hb_ot_color_palette_flags_t
+hb_ot_color_get_palette_flags (hb_face_t *face, unsigned int palette)
+{
+  const OT::CPAL& cpal = _get_cpal(face);
+  return cpal.get_palette_flags (palette);
+}
+
+
+/*
+ * COLR
+ */
+
+/**
+ * hb_ot_color_has_layers:
+ * @face: a font face.
+ *
+ * Returns: whether COLR table is available.
+ *
+ * Since: REPLACEME
+ */
+hb_bool_t
+hb_ot_color_has_layers (hb_face_t *face)
+{
+  return _get_colr (face).has_data ();
+}
+
 /**
  * hb_ot_color_get_color_layers:
  * @face: a font face.
@@ -256,21 +284,3 @@ hb_ot_color_get_color_layers (hb_face_t        *face,
   if (likely (count)) *count = num_results;
   return num_layers;
 }
-
-/**
- * hb_ot_color_get_palette_flags:
- * @face:    a font face
- * @palette: the index of the color palette whose flags are being requested
- *
- * Returns: the flags for the requested color palette.  If @face has no colors,
- * or if @palette is not between 0 and hb_ot_color_get_palette_count(),
- * the result is #HB_OT_COLOR_PALETTE_FLAG_DEFAULT.
- *
- * Since: REPLACEME
- */
-hb_ot_color_palette_flags_t
-hb_ot_color_get_palette_flags (hb_face_t *face, unsigned int palette)
-{
-  const OT::CPAL& cpal = _get_cpal(face);
-  return cpal.get_palette_flags (palette);
-}

src/hb-ot-color.h

@@ -38,11 +38,13 @@
 
 HB_BEGIN_DECLS
 
-HB_EXTERN hb_bool_t
-hb_ot_color_has_cpal_data (hb_face_t *face);
+
+/*
+ * Color palettes.
+ */
 
 HB_EXTERN hb_bool_t
-hb_ot_color_has_colr_data (hb_face_t *face);
+hb_ot_color_has_palettes (hb_face_t *face);
 
 HB_EXTERN unsigned int
 hb_ot_color_get_palette_count (hb_face_t *face);
@@ -60,14 +62,6 @@ hb_ot_color_get_palette_colors (hb_face_t      *face,
 				unsigned int   *color_count,  /* IN/OUT.  May be NULL. */
 				hb_color_t     *colors        /* OUT.     May be NULL. */);
 
-HB_EXTERN unsigned int
-hb_ot_color_get_color_layers (hb_face_t       *face,
-			      hb_codepoint_t   glyph,
-			      unsigned int     start_offset,
-			      unsigned int    *count,        /* IN/OUT.  May be NULL. */
-			      hb_codepoint_t  *glyphs,       /* OUT.     May be NULL. */
-			      unsigned int    *color_indices /* OUT.     May be NULL. */);
-
 /**
  * hb_ot_color_palette_flags_t:
  * @HB_OT_COLOR_PALETTE_FLAG_DEFAULT: default indicating that there is nothing special
@@ -89,6 +83,23 @@ HB_EXTERN hb_ot_color_palette_flags_t
 hb_ot_color_get_palette_flags (hb_face_t *face, unsigned int palette);
 
 
+
+/*
+ * Color layers.
+ */
+
+HB_EXTERN hb_bool_t
+hb_ot_color_has_layers (hb_face_t *face);
+
+HB_EXTERN unsigned int
+hb_ot_color_get_color_layers (hb_face_t       *face,
+			      hb_codepoint_t   glyph,
+			      unsigned int     start_offset,
+			      unsigned int    *count,        /* IN/OUT.  May be NULL. */
+			      hb_codepoint_t  *glyphs,       /* OUT.     May be NULL. */
+			      unsigned int    *color_indices /* OUT.     May be NULL. */);
+
+
 HB_END_DECLS
 
 #endif /* HB_OT_COLOR_H */

test/api/test-ot-color.c

@@ -354,21 +354,21 @@ test_hb_ot_color_has_data (void)
 {
   hb_face_t *empty = hb_face_get_empty ();
 
-  g_assert (hb_ot_color_has_colr_data (empty) == FALSE);
-  g_assert (hb_ot_color_has_colr_data (cpal_v0) == TRUE);
-  g_assert (hb_ot_color_has_colr_data (cpal_v1) == TRUE);
-  g_assert (hb_ot_color_has_colr_data (cpal) == TRUE);
-  g_assert (hb_ot_color_has_colr_data (cbdt) == FALSE);
-  g_assert (hb_ot_color_has_colr_data (sbix) == FALSE);
-  g_assert (hb_ot_color_has_colr_data (svg) == FALSE);
-
-  g_assert (hb_ot_color_has_cpal_data (empty) == FALSE);
-  g_assert (hb_ot_color_has_cpal_data (cpal_v0) == TRUE);
-  g_assert (hb_ot_color_has_cpal_data (cpal_v1) == TRUE);
-  g_assert (hb_ot_color_has_cpal_data (cpal) == TRUE);
-  g_assert (hb_ot_color_has_cpal_data (cbdt) == FALSE);
-  g_assert (hb_ot_color_has_cpal_data (sbix) == FALSE);
-  g_assert (hb_ot_color_has_cpal_data (svg) == FALSE);
+  g_assert (hb_ot_color_has_layers (empty) == FALSE);
+  g_assert (hb_ot_color_has_layers (cpal_v0) == TRUE);
+  g_assert (hb_ot_color_has_layers (cpal_v1) == TRUE);
+  g_assert (hb_ot_color_has_layers (cpal) == TRUE);
+  g_assert (hb_ot_color_has_layers (cbdt) == FALSE);
+  g_assert (hb_ot_color_has_layers (sbix) == FALSE);
+  g_assert (hb_ot_color_has_layers (svg) == FALSE);
+
+  g_assert (hb_ot_color_has_palettes (empty) == FALSE);
+  g_assert (hb_ot_color_has_palettes (cpal_v0) == TRUE);
+  g_assert (hb_ot_color_has_palettes (cpal_v1) == TRUE);
+  g_assert (hb_ot_color_has_palettes (cpal) == TRUE);
+  g_assert (hb_ot_color_has_palettes (cbdt) == FALSE);
+  g_assert (hb_ot_color_has_palettes (sbix) == FALSE);
+  g_assert (hb_ot_color_has_palettes (svg) == FALSE);
 }
 
 int