[Complex Text Layouts] Implement TextServer interface. Implement Fallback TextServer.

1 files changed, 172 insertions, 0 deletions

diff --git a/modules/text_server_fb/dynamic_font_fb.h b/modules/text_server_fb/dynamic_font_fb.h
new file mode 100644
index 0000000000..060b8cfbf9
--- /dev/null
+++ b/modules/text_server_fb/dynamic_font_fb.h
@@ -0,0 +1,172 @@
+/*************************************************************************/
+/*  dynamic_font_fb.h                                                    */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef DYNAMIC_FONT_FALLBACK_H
+#define DYNAMIC_FONT_FALLBACK_H
+
+#include "font_fb.h"
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+
+struct DynamicFontDataFallback : public FontDataFallback {
+	_THREAD_SAFE_CLASS_
+
+private:
+	struct CharTexture {
+		Vector<uint8_t> imgdata;
+		int texture_size = 0;
+		Vector<int> offsets;
+		Ref<ImageTexture> texture;
+	};
+
+	struct Character {
+		bool found = false;
+		int texture_idx = 0;
+		Rect2 rect;
+		Rect2 rect_uv;
+		Vector2 align;
+		Vector2 advance = Vector2(-1, -1);
+
+		static Character not_found();
+	};
+
+	struct TexturePosition {
+		int index = 0;
+		int x = 0;
+		int y = 0;
+	};
+
+	struct CacheID {
+		union {
+			struct {
+				uint32_t size : 16;
+				uint32_t outline_size : 16;
+			};
+			uint32_t key;
+		};
+		bool operator<(CacheID right) const {
+			return key < right.key;
+		}
+		CacheID() {
+			key = 0;
+		}
+	};
+
+	struct DataAtSize {
+		FT_Face face = nullptr;
+		FT_StreamRec stream;
+
+		int size = 0;
+		float scale_color_font = 1.f;
+		float ascent = 0;
+		float descent = 0;
+		float underline_position = 0;
+		float underline_thickness = 0;
+
+		Vector<CharTexture> textures;
+		HashMap<char32_t, Character> char_map;
+
+		~DataAtSize() {
+			if (face != nullptr) {
+				FT_Done_Face(face);
+			}
+		}
+	};
+
+	FT_Library library = nullptr;
+
+	// Source data.
+	const uint8_t *font_mem = nullptr;
+	int font_mem_size = 0;
+	String font_path;
+	static HashMap<String, Vector<uint8_t>> font_mem_cache;
+
+	float rect_margin = 1.f;
+	int base_size = 16;
+	float oversampling = 1.f;
+	bool antialiased = true;
+	bool force_autohinter = false;
+	TextServer::Hinting hinting = TextServer::HINTING_LIGHT;
+
+	Map<CacheID, DataAtSize *> size_cache;
+	Map<CacheID, DataAtSize *> size_cache_outline;
+
+	static unsigned long _ft_stream_io(FT_Stream stream, unsigned long offset, unsigned char *buffer, unsigned long count);
+	static void _ft_stream_close(FT_Stream stream);
+
+	DataAtSize *get_data_for_size(int p_size, int p_outline_size = 0);
+
+	TexturePosition find_texture_pos_for_glyph(DataAtSize *p_data, int p_color_size, Image::Format p_image_format, int p_width, int p_height);
+	Character bitmap_to_character(DataAtSize *p_data, FT_Bitmap bitmap, int yofs, int xofs, const Vector2 &advance);
+	_FORCE_INLINE_ void update_char(int p_size, char32_t p_char);
+	_FORCE_INLINE_ void update_char_outline(int p_size, int p_outline_size, char32_t p_char);
+
+public:
+	virtual void clear_cache() override;
+
+	virtual Error load_from_file(const String &p_filename, int p_base_size) override;
+	virtual Error load_from_memory(const uint8_t *p_data, size_t p_size, int p_base_size) override;
+
+	virtual float get_height(int p_size) const override;
+	virtual float get_ascent(int p_size) const override;
+	virtual float get_descent(int p_size) const override;
+
+	virtual float get_underline_position(int p_size) const override;
+	virtual float get_underline_thickness(int p_size) const override;
+
+	virtual void set_antialiased(bool p_antialiased) override;
+	virtual bool get_antialiased() const override;
+
+	virtual void set_hinting(TextServer::Hinting p_hinting) override;
+	virtual TextServer::Hinting get_hinting() const override;
+
+	virtual void set_force_autohinter(bool p_enabeld) override;
+	virtual bool get_force_autohinter() const override;
+
+	virtual void set_distance_field_hint(bool p_distance_field) override{};
+	virtual bool get_distance_field_hint() const override { return false; };
+
+	virtual bool has_outline() const override;
+	virtual float get_base_size() const override;
+
+	virtual bool has_char(char32_t p_char) const override;
+	virtual String get_supported_chars() const override;
+
+	virtual Vector2 get_advance(char32_t p_char, int p_size) const override;
+	virtual Vector2 get_kerning(char32_t p_char, char32_t p_next, int p_size) const override;
+
+	virtual Vector2 draw_glyph(RID p_canvas, int p_size, const Vector2 &p_pos, uint32_t p_index, const Color &p_color) const override;
+	virtual Vector2 draw_glyph_outline(RID p_canvas, int p_size, int p_outline_size, const Vector2 &p_pos, uint32_t p_index, const Color &p_color) const override;
+
+	virtual ~DynamicFontDataFallback() override;
+};
+
+#endif // DYNAMIC_FONT_FALLBACK_H