SDL_ttf: Add comment for freetype compilation

From 8eed258386c57236756211eda7377984db88b9ee Mon Sep 17 00:00:00 2001
From: Sylvain <[EMAIL REDACTED]>
Date: Fri, 4 Jun 2021 10:29:58 +0200
Subject: [PATCH] Add comment for freetype compilation Rendering with color:
 Freetype may need to be compiled with FT_CONFIG_OPTION_USE_PNG Using HarfBuzz
 for Complex text rendering: Freetype may need to be compiled with
 FT_CONFIG_OPTION_USE_HARFBUZZ

---
 SDL_ttf.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/SDL_ttf.c b/SDL_ttf.c
index a15a03a..f746fd9 100644
--- a/SDL_ttf.c
+++ b/SDL_ttf.c
@@ -33,7 +33,8 @@
 #include FT_TRUETYPE_IDS_H
 #include FT_IMAGE_H
 
-/* Enable rendering with color */
+/* Enable rendering with color
+ * Freetype may need to be compiled with FT_CONFIG_OPTION_USE_PNG */
 #if defined(FT_HAS_COLOR)
 #  define TTF_USE_COLOR 1
 #else
@@ -51,7 +52,8 @@
 #include FT_MODULE_H
 #endif
 
-/* Enable HarfBuzz for Complex text rendering */
+/* Enable HarfBuzz for Complex text rendering
+ * Freetype may need to be compiled with FT_CONFIG_OPTION_USE_HARFBUZZ */
 #ifndef TTF_USE_HARFBUZZ
 #  define TTF_USE_HARFBUZZ 0
 #endif