[gtk/small-text-fixes: 4/7] gsk: Add font options to text nodes

[Matthias Clasen <matthiasc src gnome org>]

commit 0b31c2beb3e9bedd3988f2dbbad3550fcf5ab128
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Sep 3 07:15:52 2021 -0400

    gsk: Add font options to text nodes
    
    Since font options affect how the glyphs get rendered,
    we need to pass the font options down from the gtk level
    to where the glyph cache is populated.
    
    Add a new gsk_text_node_new_full api that takes a
    cairo_font_options_t in addition to the other parameters.

 gsk/gskrendernode.h     | 13 ++++++++
 gsk/gskrendernodeimpl.c | 82 +++++++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 89 insertions(+), 6 deletions(-)
---
diff --git a/gsk/gskrendernode.h b/gsk/gskrendernode.h
index c420633a91..39fc403119 100644
--- a/gsk/gskrendernode.h
+++ b/gsk/gskrendernode.h
@@ -492,6 +492,19 @@ GskRenderNode *         gsk_text_node_new                       (PangoFont
                                                                  PangoGlyphString         *glyphs,
                                                                  const GdkRGBA            *color,
                                                                  const graphene_point_t   *offset);
+GDK_AVAILABLE_IN_4_6
+GskRenderNode *         gsk_text_node_new_full                  (const cairo_font_options_t *options,
+                                                                 PangoFont                  *font,
+                                                                 PangoGlyphString           *glyphs,
+                                                                 const GdkRGBA              *color,
+                                                                 const graphene_point_t     *offset);
+
+GDK_AVAILABLE_IN_4_6
+gboolean                gsk_text_node_get_hint_metrics          (const GskRenderNode      *node) G_GNUC_PURE;
+GDK_AVAILABLE_IN_4_6
+gboolean                gsk_text_node_get_antialias             (const GskRenderNode      *node) G_GNUC_PURE;
+GDK_AVAILABLE_IN_4_6
+cairo_hint_style_t      gsk_text_node_get_hint_style            (const GskRenderNode      *node) G_GNUC_PURE;
 GDK_AVAILABLE_IN_ALL
 PangoFont *             gsk_text_node_get_font                  (const GskRenderNode      *node) G_GNUC_PURE;
 GDK_AVAILABLE_IN_ALL
diff --git a/gsk/gskrendernodeimpl.c b/gsk/gskrendernodeimpl.c
index 30ef0ff38b..ce686eca7a 100644
--- a/gsk/gskrendernodeimpl.c
+++ b/gsk/gskrendernodeimpl.c
@@ -4336,7 +4336,10 @@ struct _GskTextNode
   GskRenderNode render_node;
 
   PangoFont *font;
-  gboolean has_color_glyphs;
+  guint has_color_glyphs : 1;
+  guint hint_metrics     : 1;
+  guint antialias        : 1;
+  guint hint_style       : 3;
 
   GdkRGBA color;
   graphene_point_t offset;
@@ -4363,6 +4366,7 @@ gsk_text_node_draw (GskRenderNode *node,
 {
   GskTextNode *self = (GskTextNode *) node;
   PangoGlyphString glyphs;
+  cairo_font_options_t *options;
 
   glyphs.num_glyphs = self->num_glyphs;
   glyphs.glyphs = self->glyphs;
@@ -4370,6 +4374,13 @@ gsk_text_node_draw (GskRenderNode *node,
 
   cairo_save (cr);
 
+  options = cairo_font_options_create ();
+  cairo_font_options_set_hint_metrics (options, self->hint_metrics ? CAIRO_HINT_METRICS_ON : 
CAIRO_HINT_METRICS_OFF);
+  cairo_font_options_set_antialias (options, self->antialias ? CAIRO_ANTIALIAS_GRAY : CAIRO_ANTIALIAS_NONE);
+  cairo_font_options_set_hint_style (options, self->hint_style);
+  cairo_set_font_options (cr, options);
+  cairo_font_options_destroy (options);
+
   gdk_cairo_set_source_rgba (cr, &self->color);
   cairo_translate (cr, self->offset.x, self->offset.y);
   pango_cairo_show_glyph_string (cr, self->font, &glyphs);
@@ -4425,7 +4436,8 @@ gsk_text_node_diff (GskRenderNode  *node1,
 }
 
 /**
- * gsk_text_node_new:
+ * gsk_text_node_new_full:
+ * @options: (nullable): `cairo_font_options_t` to render with
  * @font: the `PangoFont` containing the glyphs
  * @glyphs: the `PangoGlyphString` to render
  * @color: the foreground color to render with
@@ -4439,10 +4451,11 @@ gsk_text_node_diff (GskRenderNode  *node1,
  * Returns: (nullable) (transfer full) (type GskTextNode): a new `GskRenderNode`
  */
 GskRenderNode *
-gsk_text_node_new (PangoFont              *font,
-                   PangoGlyphString       *glyphs,
-                   const GdkRGBA          *color,
-                   const graphene_point_t *offset)
+gsk_text_node_new_full (const cairo_font_options_t *options,
+                        PangoFont                  *font,
+                        PangoGlyphString           *glyphs,
+                        const GdkRGBA              *color,
+                        const graphene_point_t     *offset)
 {
   GskTextNode *self;
   GskRenderNode *node;
@@ -4464,6 +4477,16 @@ gsk_text_node_new (PangoFont              *font,
   self->color = *color;
   self->offset = *offset;
   self->has_color_glyphs = FALSE;
+  self->antialias = TRUE;
+  self->hint_style = CAIRO_HINT_STYLE_NONE;
+  self->hint_metrics = FALSE;
+
+  if (options)
+    {
+      self->antialias = cairo_font_options_get_antialias (options) != CAIRO_ANTIALIAS_NONE;
+      self->hint_metrics = cairo_font_options_get_hint_metrics (options) == CAIRO_HINT_METRICS_ON;
+      self->hint_style = cairo_font_options_get_hint_style (options);
+    }
 
   glyph_infos = g_malloc_n (glyphs->num_glyphs, sizeof (PangoGlyphInfo));
 
@@ -4494,6 +4517,53 @@ gsk_text_node_new (PangoFont              *font,
   return node;
 }
 
+/**
+ * gsk_text_node_new:
+ * @font: the `PangoFont` containing the glyphs
+ * @glyphs: the `PangoGlyphString` to render
+ * @color: the foreground color to render with
+ * @offset: offset of the baseline
+ *
+ * Creates a render node that renders the given glyphs.
+ *
+ * Note that @color may not be used if the font contains
+ * color glyphs.
+ *
+ * Returns: (nullable) (transfer full) (type GskTextNode): a new `GskRenderNode`
+ */
+GskRenderNode *
+gsk_text_node_new (PangoFont              *font,
+                   PangoGlyphString       *glyphs,
+                   const GdkRGBA          *color,
+                   const graphene_point_t *offset)
+{
+  return gsk_text_node_new_full (NULL, font, glyphs, color, offset);
+}
+
+gboolean
+gsk_text_node_get_hint_metrics (const GskRenderNode *node)
+{
+  const GskTextNode *self = (const GskTextNode *) node;
+
+  return self->hint_metrics;
+}
+
+gboolean
+gsk_text_node_get_antialias (const GskRenderNode *node)
+{
+  const GskTextNode *self = (const GskTextNode *) node;
+
+  return self->antialias;
+}
+
+cairo_hint_style_t
+gsk_text_node_get_hint_style (const GskRenderNode *node)
+{
+  const GskTextNode *self = (const GskTextNode *) node;
+
+  return self->hint_style;
+}
+
 /**
  * gsk_text_node_get_color:
  * @node: (type GskTextNode): a text `GskRenderNode`