From 71efa0dcf12eb3924697f96d3a4ed203bb71962b Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Wed, 14 Dec 2022 06:22:00 -0500
Subject: [PATCH] wip: hb_font_paint_glyph

---
 src/hb-font.cc | 30 ++++++++++++++++++++++++++++++
 src/hb-font.h  | 16 ++++++++++++++++
 src/hb-font.hh |  9 +++++++++
 3 files changed, 55 insertions(+)

diff --git a/src/hb-font.cc b/src/hb-font.cc
index 0ce3e2608..59512b049 100644
--- a/src/hb-font.cc
+++ b/src/hb-font.cc
@@ -30,6 +30,7 @@
 
 #include "hb-font.hh"
 #include "hb-draw.hh"
+#include "hb-paint.hh"
 #include "hb-machinery.hh"
 
 #include "hb-ot.h"
@@ -512,6 +513,15 @@ hb_font_get_glyph_shape_nil (hb_font_t       *font HB_UNUSED,
 {
 }
 
+static void
+hb_font_get_glyph_paint_nil (hb_font_t *font HB_UNUSED,
+                             void *font_data HB_UNUSED,
+                             hb_codepoint_t glyph HB_UNUSED,
+                             hb_paint_funcs_t *paint_funcs HB_UNUSED,
+                             void *paint_data HB_UNUSED,
+                             void *user_data HB_UNUSED)
+{
+}
 
 typedef struct hb_font_get_glyph_shape_default_adaptor_t {
   hb_draw_funcs_t *draw_funcs;
@@ -639,6 +649,18 @@ hb_font_get_glyph_shape_default (hb_font_t       *font,
 				 &adaptor);
 }
 
+static void
+hb_font_get_glyph_paint_default (hb_font_t *font,
+                                 void *font_data,
+                                 hb_codepoint_t glyph,
+                                 hb_paint_funcs_t *paint_funcs,
+                                 void *paint_data,
+                                 void *user_data)
+{
+  // FIXME adaptor like for draw funcs
+  font->parent->get_glyph_paint (glyph, paint_funcs, paint_data);
+}
+
 DEFINE_NULL_INSTANCE (hb_font_funcs_t) =
 {
   HB_OBJECT_HEADER_STATIC,
@@ -1366,6 +1388,14 @@ hb_font_get_glyph_shape (hb_font_t *font,
   font->get_glyph_shape (glyph, dfuncs, draw_data);
 }
 
+void
+hb_font_paint_glyph (hb_font_t *font,
+                     hb_codepoint_t glyph,
+                     hb_paint_funcs_t *funcs, void *paint_data)
+{
+  font->get_glyph_paint (glyph, funcs, paint_data);
+}
+
 /* A bit higher-level, and with fallback */
 
 /**
diff --git a/src/hb-font.h b/src/hb-font.h
index e2c3df4a5..99c73a217 100644
--- a/src/hb-font.h
+++ b/src/hb-font.h
@@ -34,6 +34,7 @@
 #include "hb-common.h"
 #include "hb-face.h"
 #include "hb-draw.h"
+#include "hb-paint.h"
 
 HB_BEGIN_DECLS
 
@@ -531,6 +532,11 @@ typedef void (*hb_font_get_glyph_shape_func_t) (hb_font_t *font, void *font_data
 						void *user_data);
 
 
+typedef void (*hb_font_get_glyph_paint_func_t) (hb_font_t *font, void *font_data,
+                                                hb_codepoint_t glyph,
+                                                hb_paint_funcs_t *paint_funcs, void *paint_data,
+                                                void *user_data);
+
 /* func setters */
 
 /**
@@ -805,6 +811,11 @@ hb_font_funcs_set_glyph_shape_func (hb_font_funcs_t *ffuncs,
 				    hb_font_get_glyph_shape_func_t func,
 				    void *user_data, hb_destroy_func_t destroy);
 
+HB_EXTERN void
+hb_font_funcs_set_glyph_paint_func (hb_font_funcs_t *ffuncs,
+                                    hb_font_get_glyph_paint_func_t func,
+                                    void *user_data, hb_destroy_func_t destroy);
+
 /* func dispatch */
 
 HB_EXTERN hb_bool_t
@@ -890,6 +901,11 @@ hb_font_get_glyph_shape (hb_font_t *font,
 			 hb_codepoint_t glyph,
 			 hb_draw_funcs_t *dfuncs, void *draw_data);
 
+HB_EXTERN void
+hb_font_paint_glyph (hb_font_t *font,
+                     hb_codepoint_t glyph,
+                     hb_paint_funcs_t *funcs, void *paint_data);
+
 
 /* high-level funcs, with fallback */
 
diff --git a/src/hb-font.hh b/src/hb-font.hh
index a8b3ee5c4..d45c6a8f7 100644
--- a/src/hb-font.hh
+++ b/src/hb-font.hh
@@ -58,6 +58,7 @@
   HB_FONT_FUNC_IMPLEMENT (glyph_name) \
   HB_FONT_FUNC_IMPLEMENT (glyph_from_name) \
   HB_FONT_FUNC_IMPLEMENT (glyph_shape) \
+  HB_FONT_FUNC_IMPLEMENT (glyph_paint) \
   /* ^--- Add new callbacks here */
 
 struct hb_font_funcs_t
@@ -401,6 +402,14 @@ struct hb_font_t
 			      !klass->user_data ? nullptr : klass->user_data->glyph_shape);
   }
 
+  void get_glyph_paint (hb_codepoint_t glyph,
+                        hb_paint_funcs_t *paint_funcs, void *paint_data)
+  {
+    klass->get.f.glyph_paint (this, user_data,
+                              glyph,
+                              paint_funcs, paint_data,
+                              !klass->user_data ? nullptr : klass->user_data->glyph_paint);
+  }
 
   /* A bit higher-level, and with fallback */