From 6e4cdad3ac5b0eac89a381575ec297912c330bec Mon Sep 17 00:00:00 2001
From: bruvzg <7645683+bruvzg@users.noreply.github.com>
Date: Tue, 7 Jun 2022 11:35:59 +0300
Subject: [TextServer] Adds support for TrueType / OpenType collection files
 (*.TTC, *.OTC).

---
 modules/text_server_adv/text_server_adv.cpp | 74 ++++++++++++++++++++++++++++-
 modules/text_server_adv/text_server_adv.h   |  6 +++
 2 files changed, 79 insertions(+), 1 deletion(-)

(limited to 'modules/text_server_adv')

diff --git a/modules/text_server_adv/text_server_adv.cpp b/modules/text_server_adv/text_server_adv.cpp
index d18ed97def..cb51cef800 100644
--- a/modules/text_server_adv/text_server_adv.cpp
+++ b/modules/text_server_adv/text_server_adv.cpp
@@ -1288,7 +1288,16 @@ _FORCE_INLINE_ bool TextServerAdvanced::_ensure_cache_for_size(FontDataAdvanced
 		fargs.memory_size = p_font_data->data_size;
 		fargs.flags = FT_OPEN_MEMORY;
 		fargs.stream = &fd->stream;
-		error = FT_Open_Face(ft_library, &fargs, 0, &fd->face);
+
+		int max_index = 0;
+		FT_Face tmp_face;
+		error = FT_Open_Face(ft_library, &fargs, -1, &tmp_face);
+		if (error == 0) {
+			max_index = tmp_face->num_faces - 1;
+		}
+		FT_Done_Face(tmp_face);
+
+		error = FT_Open_Face(ft_library, &fargs, CLAMP(p_font_data->face_index, 0, max_index), &fd->face);
 		if (error) {
 			FT_Done_Face(fd->face);
 			fd->face = nullptr;
@@ -1720,6 +1729,69 @@ void TextServerAdvanced::font_set_data_ptr(const RID &p_font_rid, const uint8_t
 	fd->data_size = p_data_size;
 }
 
+void TextServerAdvanced::font_set_face_index(const RID &p_font_rid, int64_t p_face_index) {
+	ERR_FAIL_COND(p_face_index < 0);
+	ERR_FAIL_COND(p_face_index >= 0x7FFF);
+
+	FontDataAdvanced *fd = font_owner.get_or_null(p_font_rid);
+	ERR_FAIL_COND(!fd);
+
+	MutexLock lock(fd->mutex);
+	if (fd->face_index != p_face_index) {
+		fd->face_index = p_face_index;
+		_font_clear_cache(fd);
+	}
+}
+
+int64_t TextServerAdvanced::font_get_face_index(const RID &p_font_rid) const {
+	FontDataAdvanced *fd = font_owner.get_or_null(p_font_rid);
+	ERR_FAIL_COND_V(!fd, 0);
+
+	MutexLock lock(fd->mutex);
+	return fd->face_index;
+}
+
+int64_t TextServerAdvanced::font_get_face_count(const RID &p_font_rid) const {
+	FontDataAdvanced *fd = font_owner.get_or_null(p_font_rid);
+	ERR_FAIL_COND_V(!fd, 0);
+
+	MutexLock lock(fd->mutex);
+	int face_count = 0;
+
+	if (fd->data_ptr && (fd->data_size > 0)) {
+		// Init dynamic font.
+#ifdef MODULE_FREETYPE_ENABLED
+		int error = 0;
+		if (!ft_library) {
+			error = FT_Init_FreeType(&ft_library);
+			ERR_FAIL_COND_V_MSG(error != 0, false, "FreeType: Error initializing library: '" + String(FT_Error_String(error)) + "'.");
+		}
+
+		FT_StreamRec stream;
+		memset(&stream, 0, sizeof(FT_StreamRec));
+		stream.base = (unsigned char *)fd->data_ptr;
+		stream.size = fd->data_size;
+		stream.pos = 0;
+
+		FT_Open_Args fargs;
+		memset(&fargs, 0, sizeof(FT_Open_Args));
+		fargs.memory_base = (unsigned char *)fd->data_ptr;
+		fargs.memory_size = fd->data_size;
+		fargs.flags = FT_OPEN_MEMORY;
+		fargs.stream = &stream;
+
+		FT_Face tmp_face;
+		error = FT_Open_Face(ft_library, &fargs, -1, &tmp_face);
+		if (error == 0) {
+			face_count = tmp_face->num_faces;
+		}
+		FT_Done_Face(tmp_face);
+#endif
+	}
+
+	return face_count;
+}
+
 void TextServerAdvanced::font_set_style(const RID &p_font_rid, int64_t /*FontStyle*/ p_style) {
 	FontDataAdvanced *fd = font_owner.get_or_null(p_font_rid);
 	ERR_FAIL_COND(!fd);
diff --git a/modules/text_server_adv/text_server_adv.h b/modules/text_server_adv/text_server_adv.h
index 62f94472b5..c72454d0bb 100644
--- a/modules/text_server_adv/text_server_adv.h
+++ b/modules/text_server_adv/text_server_adv.h
@@ -247,6 +247,7 @@ class TextServerAdvanced : public TextServerExtension {
 		PackedByteArray data;
 		const uint8_t *data_ptr;
 		size_t data_size;
+		int face_index = 0;
 		mutable ThreadWorkPool work_pool;
 
 		~FontDataAdvanced() {
@@ -473,6 +474,11 @@ public:
 	virtual void font_set_data(const RID &p_font_rid, const PackedByteArray &p_data) override;
 	virtual void font_set_data_ptr(const RID &p_font_rid, const uint8_t *p_data_ptr, int64_t p_data_size) override;
 
+	virtual void font_set_face_index(const RID &p_font_rid, int64_t p_index) override;
+	virtual int64_t font_get_face_index(const RID &p_font_rid) const override;
+
+	virtual int64_t font_get_face_count(const RID &p_font_rid) const override;
+
 	virtual void font_set_style(const RID &p_font_rid, int64_t /*FontStyle*/ p_style) override;
 	virtual int64_t /*FontStyle*/ font_get_style(const RID &p_font_rid) const override;
 
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