From 5d7553d38f178c1c071f356f98bbf43d21b4ce29 Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Wed, 21 Dec 2022 15:18:02 -0500
Subject: [PATCH] view: Add a --font-palette option

---
 util/font-options.hh      |  2 ++
 util/helper-cairo-user.hh | 10 +++++++++-
 util/helper-cairo.hh      |  3 +++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/util/font-options.hh b/util/font-options.hh
index 331efd7da..6dd8e3b12 100644
--- a/util/font-options.hh
+++ b/util/font-options.hh
@@ -69,6 +69,7 @@ struct font_options_t : face_options_t
   mutable double font_size_y = DEFAULT_FONT_SIZE;
   char *font_funcs = nullptr;
   int ft_load_flags = 2;
+  unsigned int palette = 0;
 
   hb_font_t *font = nullptr;
 };
@@ -287,6 +288,7 @@ font_options_t::add_options (option_parser_t *parser)
 			      G_OPTION_ARG_DOUBLE,	&this->ptem,			"Set font point-size (default: 0; disabled)",	"point-size"},
     {"font-slant",	0, 0,
 			      G_OPTION_ARG_DOUBLE,	&this->slant,			"Set synthetic slant (default: 0)",		 "slant ratio; eg. 0.2"},
+    {"font-palette",    0, 0, G_OPTION_ARG_INT,         &this->palette,                 "Set font palette (default: 0)",                "index"},
     {"font-funcs",	0, 0, G_OPTION_ARG_STRING,	&this->font_funcs,		text,						"impl"},
     {"sub-font",	0, G_OPTION_FLAG_HIDDEN,
 			      G_OPTION_ARG_NONE,	&this->sub_font,		"Create a sub-font (default: false)",		"boolean"},
diff --git a/util/helper-cairo-user.hh b/util/helper-cairo-user.hh
index f115d7be1..00ca3cc90 100644
--- a/util/helper-cairo-user.hh
+++ b/util/helper-cairo-user.hh
@@ -350,6 +350,14 @@ render_color_glyph (cairo_scaled_font_t  *scaled_font,
 {
   hb_font_t *font = (hb_font_t *) (cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
 								  &_hb_font_cairo_user_data_key));
+  unsigned int palette = 0;
+#ifdef CAIRO_COLOR_PALETTE_DEFAULT
+  cairo_font_options_t *options = cairo_font_options_create ();
+  cairo_scaled_font_get_font_options (scaled_font, options);
+  palette = cairo_font_options_get_color_palette (options);
+  cairo_font_options_destroy (options);
+#endif
+
   hb_color_t color = HB_COLOR (0, 0, 0, 255);
   cairo_pattern_t *pattern = cairo_get_source (cr);
 
@@ -364,7 +372,7 @@ render_color_glyph (cairo_scaled_font_t  *scaled_font,
   hb_font_get_scale (font, &x_scale, &y_scale);
   cairo_scale (cr, +1./x_scale, -1./y_scale);
 
-  hb_font_paint_glyph (font, glyph, get_cairo_paint_funcs (), cr, 0, color);
+  hb_font_paint_glyph (font, glyph, get_cairo_paint_funcs (), cr, palette, color);
 
   hb_glyph_extents_t hb_extents;
   hb_font_get_glyph_extents (font, glyph, &hb_extents);
diff --git a/util/helper-cairo.hh b/util/helper-cairo.hh
index a8463de4d..a877ed394 100644
--- a/util/helper-cairo.hh
+++ b/util/helper-cairo.hh
@@ -118,6 +118,9 @@ helper_cairo_create_scaled_font (const font_options_t *font_opts)
   font_options = cairo_font_options_create ();
   cairo_font_options_set_hint_style (font_options, CAIRO_HINT_STYLE_NONE);
   cairo_font_options_set_hint_metrics (font_options, CAIRO_HINT_METRICS_OFF);
+#ifdef CAIRO_COLOR_PALETTE_DEFAULT
+  cairo_font_options_set_color_palette (font_options, font_opts->palette);
+#endif
 
   cairo_scaled_font_t *scaled_font = cairo_scaled_font_create (cairo_face,
 							       &font_matrix,