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virtualx-engine/servers/text_server.h

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[Complex Text Layouts] Implement TextServer interface. Implement Fallback TextServer.
2020-08-05 08:25:28 +02:00
/*************************************************************************/
/* text_server.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 TEXT_SERVER_H
#define TEXT_SERVER_H
#include "core/object/reference.h"
#include "core/os/os.h"
#include "core/templates/rid.h"
#include "core/variant/variant.h"
#include "scene/resources/texture.h"
class CanvasTexture;
class TextServer : public Object {
GDCLASS(TextServer, Object);
public:
enum Direction {
DIRECTION_AUTO,
DIRECTION_LTR,
DIRECTION_RTL
};
enum Orientation {
ORIENTATION_HORIZONTAL,
ORIENTATION_VERTICAL
};
enum JustificationFlag {
JUSTIFICATION_NONE = 0,
JUSTIFICATION_KASHIDA = 1 << 0,
JUSTIFICATION_WORD_BOUND = 1 << 1,
JUSTIFICATION_TRIM_EDGE_SPACES = 1 << 2,
JUSTIFICATION_AFTER_LAST_TAB = 1 << 3
};
enum LineBreakFlag {
BREAK_NONE = 0,
BREAK_MANDATORY = 1 << 4,
BREAK_WORD_BOUND = 1 << 5,
BREAK_GRAPHEME_BOUND = 1 << 6
//RESERVED = 1 << 7
};
enum GraphemeFlag {
GRAPHEME_IS_VALID = 1 << 0, // Glyph is valid.
GRAPHEME_IS_RTL = 1 << 1, // Glyph is right-to-left.
GRAPHEME_IS_VIRTUAL = 1 << 2, // Glyph is not part of source string (added by fit_to_width function, do not affect caret movement).
GRAPHEME_IS_SPACE = 1 << 3, // Is whitespace (for justification).
GRAPHEME_IS_BREAK_HARD = 1 << 4, // Is line break (mandatory break, e.g "\n")
GRAPHEME_IS_BREAK_SOFT = 1 << 5, // Is line break (optional break, e.g space)
GRAPHEME_IS_TAB = 1 << 6, // Is tab or vertical tab
GRAPHEME_IS_ELONGATION = 1 << 7 // Elongation (e.g kashida), glyph can be duplicated or truncated to fit line to width.
};
enum Hinting {
HINTING_NONE,
HINTING_LIGHT,
HINTING_NORMAL
};
enum Feature {
FEATURE_BIDI_LAYOUT = 1 << 0,
FEATURE_VERTICAL_LAYOUT = 1 << 1,
FEATURE_SHAPING = 1 << 2,
FEATURE_KASHIDA_JUSTIFICATION = 1 << 3,
FEATURE_BREAK_ITERATORS = 1 << 4,
FEATURE_FONT_SYSTEM = 1 << 5,
[Complex Text Layouts] Add variable fonts support.
2020-10-22 18:40:18 +02:00
FEATURE_FONT_VARIABLE = 1 << 6,
FEATURE_USE_SUPPORT_DATA = 1 << 7
[Complex Text Layouts] Implement TextServer interface. Implement Fallback TextServer.
2020-08-05 08:25:28 +02:00
};
struct Glyph {
int start = -1; // Start offset in the source string.
int end = -1; // End offset in the source string.
uint8_t count = 0; // Number of glyphs in the grapheme, set in the first glyph only.
uint8_t repeat = 1; // Draw multiple times in the row.
uint8_t flags = 0; // Grapheme flags (valid, rtl, virtual), set in the first glyph only.
float x_off = 0.f; // Offset from the origin of the glyph on baseline.
float y_off = 0.f;
float advance = 0.f; // Advance to the next glyph along baseline(x for horizontal layout, y for vertical).
RID font_rid; // Font resource.
int font_size = 0; // Font size;
uint32_t index = 0; // Glyph index (font specific) or UTF-32 codepoint (for the invalid glyphs).
bool operator==(const Glyph &p_a) const;
bool operator!=(const Glyph &p_a) const;
bool operator<(const Glyph &p_a) const;
bool operator>(const Glyph &p_a) const;
};
struct GlyphCompare { // For line breaking reordering.
_FORCE_INLINE_ bool operator()(const Glyph &l, const Glyph &r) const {
if (l.start == r.start) {
if (l.count == r.count) {
if ((l.flags & GRAPHEME_IS_VIRTUAL) == GRAPHEME_IS_VIRTUAL) {
return false;
} else {
return true;
}
}
return l.count > r.count; // Sort first glyoh with count & flags, order of the rest are irrelevant.
} else {
return l.start < r.start;
}
}
};
struct ShapedTextData {
/* Source data */
RID parent; // Substring parent ShapedTextData.
int start = 0; // Substring start offset in the parent string.
int end = 0; // Substring end offset in the parent string.
String text;
TextServer::Direction direction = DIRECTION_LTR; // Desired text direction.
TextServer::Orientation orientation = ORIENTATION_HORIZONTAL;
struct Span {
int start = -1;
int end = -1;
Vector<RID> fonts;
int font_size = 0;
Variant embedded_key;
String language;
Dictionary features;
};
Vector<Span> spans;
struct EmbeddedObject {
int pos = 0;
VAlign inline_align = VALIGN_TOP;
Rect2 rect;
};
Map<Variant, EmbeddedObject> objects;
/* Shaped data */
TextServer::Direction para_direction = DIRECTION_LTR; // Detected text direction.
bool valid = false; // String is shaped.
bool line_breaks_valid = false; // Line and word break flags are populated (and virtual zero width spaces inserted).
bool justification_ops_valid = false; // Virtual elongation glyphs are added to the string.
bool sort_valid = false;
bool preserve_invalid = true; // Draw hex code box instead of missing characters.
bool preserve_control = false; // Draw control characters.
float ascent = 0.f; // Ascent for horizontal layout, 1/2 of width for vertical.
float descent = 0.f; // Descent for horizontal layout, 1/2 of width for vertical.
float width = 0.f; // Width for horizontal layout, height for vertical.
float upos = 0.f;
float uthk = 0.f;
Vector<TextServer::Glyph> glyphs;
Vector<TextServer::Glyph> glyphs_logical;
};
struct BitmapFontData {
int height = 0;
int ascent = 0;
int charcount = 0;
const int *char_rects = nullptr;
int kerning_count = 0;
const int *kernings = nullptr;
int w = 0;
int h = 0;
const unsigned char *img = nullptr;
};
protected:
static void _bind_methods();
static Vector3 hex_code_box_font_size[2];
static Ref<CanvasTexture> hex_code_box_font_tex[2];
public:
static void initialize_hex_code_box_fonts();
static void finish_hex_code_box_fonts();
virtual bool has_feature(Feature p_feature) = 0;
virtual String get_name() const = 0;
virtual void free(RID p_rid) = 0;
virtual bool has(RID p_rid) = 0;
virtual bool load_support_data(const String &p_filename) = 0;
#ifdef TOOLS_ENABLED
virtual String get_support_data_filename() = 0;
virtual String get_support_data_info() = 0;
virtual bool save_support_data(const String &p_filename) = 0;
#endif
virtual bool is_locale_right_to_left(const String &p_locale) = 0;
virtual int32_t name_to_tag(const String &p_name) { return 0; };
virtual String tag_to_name(int32_t p_tag) { return ""; };
/* Font interface */
virtual RID create_font_system(const String &p_name, int p_base_size = 16) = 0;
virtual RID create_font_resource(const String &p_filename, int p_base_size = 16) = 0;
virtual RID create_font_memory(const uint8_t *p_data, size_t p_size, const String &p_type, int p_base_size = 16) = 0;
virtual float font_get_height(RID p_font, int p_size) const = 0;
virtual float font_get_ascent(RID p_font, int p_size) const = 0;
virtual float font_get_descent(RID p_font, int p_size) const = 0;
virtual float font_get_underline_position(RID p_font, int p_size) const = 0;
virtual float font_get_underline_thickness(RID p_font, int p_size) const = 0;
virtual void font_set_antialiased(RID p_font, bool p_antialiased) = 0;
virtual bool font_get_antialiased(RID p_font) const = 0;
virtual Dictionary font_get_feature_list(RID p_font) const { return Dictionary(); };
[Complex Text Layouts] Add variable fonts support.
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virtual Dictionary font_get_variation_list(RID p_font) const { return Dictionary(); };
virtual void font_set_variation(RID p_font, const String &p_name, double p_value){};
virtual double font_get_variation(RID p_font, const String &p_name) const { return 0; };
[Complex Text Layouts] Implement TextServer interface. Implement Fallback TextServer.
2020-08-05 08:25:28 +02:00
virtual void font_set_distance_field_hint(RID p_font, bool p_distance_field) = 0;
virtual bool font_get_distance_field_hint(RID p_font) const = 0;
virtual void font_set_hinting(RID p_font, Hinting p_hinting) = 0;
virtual Hinting font_get_hinting(RID p_font) const = 0;
virtual void font_set_force_autohinter(RID p_font, bool p_enabeld) = 0;
virtual bool font_get_force_autohinter(RID p_font) const = 0;
virtual bool font_has_char(RID p_font, char32_t p_char) const = 0;
virtual String font_get_supported_chars(RID p_font) const = 0;
virtual bool font_has_outline(RID p_font) const = 0;
virtual float font_get_base_size(RID p_font) const = 0;
virtual bool font_is_language_supported(RID p_font, const String &p_language) const = 0;
virtual void font_set_language_support_override(RID p_font, const String &p_language, bool p_supported) = 0;
virtual bool font_get_language_support_override(RID p_font, const String &p_language) = 0;
virtual void font_remove_language_support_override(RID p_font, const String &p_language) = 0;
virtual Vector<String> font_get_language_support_overrides(RID p_font) = 0;
virtual bool font_is_script_supported(RID p_font, const String &p_script) const = 0;
virtual void font_set_script_support_override(RID p_font, const String &p_script, bool p_supported) = 0;
virtual bool font_get_script_support_override(RID p_font, const String &p_script) = 0;
virtual void font_remove_script_support_override(RID p_font, const String &p_script) = 0;
virtual Vector<String> font_get_script_support_overrides(RID p_font) = 0;
virtual uint32_t font_get_glyph_index(RID p_font, char32_t p_char, char32_t p_variation_selector = 0x0000) const = 0;
virtual Vector2 font_get_glyph_advance(RID p_font, uint32_t p_index, int p_size) const = 0;
virtual Vector2 font_get_glyph_kerning(RID p_font, uint32_t p_index_a, uint32_t p_index_b, int p_size) const = 0;
virtual Vector2 font_draw_glyph(RID p_font, RID p_canvas, int p_size, const Vector2 &p_pos, uint32_t p_index, const Color &p_color = Color(1, 1, 1)) const = 0;
virtual Vector2 font_draw_glyph_outline(RID p_font, RID p_canvas, int p_size, int p_outline_size, const Vector2 &p_pos, uint32_t p_index, const Color &p_color = Color(1, 1, 1)) const = 0;
virtual float font_get_oversampling() const = 0;
virtual void font_set_oversampling(float p_oversampling) = 0;
Vector2 get_hex_code_box_size(int p_size, char32_t p_index) const;
void draw_hex_code_box(RID p_canvas, int p_size, const Vector2 &p_pos, char32_t p_index, const Color &p_color) const;
virtual Vector<String> get_system_fonts() const = 0;
/* Shaped text buffer interface */
virtual RID create_shaped_text(Direction p_direction = DIRECTION_AUTO, Orientation p_orientation = ORIENTATION_HORIZONTAL) = 0;
virtual void shaped_text_clear(RID p_shaped) = 0;
virtual void shaped_text_set_direction(RID p_shaped, Direction p_direction = DIRECTION_AUTO) = 0;
virtual Direction shaped_text_get_direction(RID p_shaped) const = 0;
virtual void shaped_text_set_bidi_override(RID p_shaped, const Vector<Vector2i> &p_override) = 0;
virtual void shaped_text_set_orientation(RID p_shaped, Orientation p_orientation = ORIENTATION_HORIZONTAL) = 0;
virtual Orientation shaped_text_get_orientation(RID p_shaped) const = 0;
virtual void shaped_text_set_preserve_invalid(RID p_shaped, bool p_enabled) = 0;
virtual bool shaped_text_get_preserve_invalid(RID p_shaped) const = 0;
virtual void shaped_text_set_preserve_control(RID p_shaped, bool p_enabled) = 0;
virtual bool shaped_text_get_preserve_control(RID p_shaped) const = 0;
virtual bool shaped_text_add_string(RID p_shaped, const String &p_text, const Vector<RID> &p_fonts, int p_size, const Dictionary &p_opentype_features = Dictionary(), const String &p_language = "") = 0;
virtual bool shaped_text_add_object(RID p_shaped, Variant p_key, const Size2 &p_size, VAlign p_inline_align = VALIGN_CENTER, int p_length = 1) = 0;
virtual bool shaped_text_resize_object(RID p_shaped, Variant p_key, const Size2 &p_size, VAlign p_inline_align = VALIGN_CENTER) = 0;
virtual RID shaped_text_substr(RID p_shaped, int p_start, int p_length) const = 0; // Copy shaped substring (e.g. line break) without reshaping, but correctly reordered, preservers range.
virtual RID shaped_text_get_parent(RID p_shaped) const = 0;
virtual float shaped_text_fit_to_width(RID p_shaped, float p_width, uint8_t /*JustificationFlag*/ p_jst_flags = JUSTIFICATION_WORD_BOUND | JUSTIFICATION_KASHIDA) = 0;
virtual float shaped_text_tab_align(RID p_shaped, const Vector<float> &p_tab_stops) = 0;
virtual bool shaped_text_shape(RID p_shaped) = 0;
virtual bool shaped_text_update_breaks(RID p_shaped) = 0;
virtual bool shaped_text_update_justification_ops(RID p_shaped) = 0;
virtual bool shaped_text_is_ready(RID p_shaped) const = 0;
virtual Vector<Glyph> shaped_text_get_glyphs(RID p_shaped) const = 0;
virtual Vector2i shaped_text_get_range(RID p_shaped) const = 0;
virtual Vector<Glyph> shaped_text_sort_logical(RID p_shaped) = 0;
virtual Vector<Vector2i> shaped_text_get_line_breaks_adv(RID p_shaped, const Vector<float> &p_width, int p_start = 0, bool p_once = true, uint8_t /*TextBreakFlag*/ p_break_flags = BREAK_MANDATORY | BREAK_WORD_BOUND) const;
virtual Vector<Vector2i> shaped_text_get_line_breaks(RID p_shaped, float p_width, int p_start = 0, uint8_t /*TextBreakFlag*/ p_break_flags = BREAK_MANDATORY | BREAK_WORD_BOUND) const;
virtual Vector<Vector2i> shaped_text_get_word_breaks(RID p_shaped) const;
virtual Array shaped_text_get_objects(RID p_shaped) const = 0;
virtual Rect2 shaped_text_get_object_rect(RID p_shaped, Variant p_key) const = 0;
virtual Size2 shaped_text_get_size(RID p_shaped) const = 0;
virtual float shaped_text_get_ascent(RID p_shaped) const = 0;
virtual float shaped_text_get_descent(RID p_shaped) const = 0;
virtual float shaped_text_get_width(RID p_shaped) const = 0;
virtual float shaped_text_get_underline_position(RID p_shaped) const = 0;
virtual float shaped_text_get_underline_thickness(RID p_shaped) const = 0;
virtual Direction shaped_text_get_dominant_direciton_in_range(RID p_shaped, int p_start, int p_end) const;
virtual void shaped_text_get_carets(RID p_shaped, int p_position, Rect2 &p_leading_caret, Direction &p_leading_dir, Rect2 &p_trailing_caret, Direction &p_trailing_dir) const;
virtual Vector<Vector2> shaped_text_get_selection(RID p_shaped, int p_start, int p_end) const;
virtual int shaped_text_hit_test_grapheme(RID p_shaped, float p_coords) const; // Return grapheme index.
virtual int shaped_text_hit_test_position(RID p_shaped, float p_coords) const; // Return caret/selection position.
virtual int shaped_text_next_grapheme_pos(RID p_shaped, int p_pos);
virtual int shaped_text_prev_grapheme_pos(RID p_shaped, int p_pos);
// The pen position is always placed on the baseline and moveing left to right.
virtual void shaped_text_draw(RID p_shaped, RID p_canvas, const Vector2 &p_pos, float p_clip_l = -1.f, float p_clip_r = -1.f, const Color &p_color = Color(1, 1, 1)) const;
virtual void shaped_text_draw_outline(RID p_shaped, RID p_canvas, const Vector2 &p_pos, float p_clip_l = -1.f, float p_clip_r = -1.f, int p_outline_size = 1, const Color &p_color = Color(1, 1, 1)) const;
// Number conversion.
virtual String format_number(const String &p_string, const String &p_language = "") const { return p_string; };
virtual String parse_number(const String &p_string, const String &p_language = "") const { return p_string; };
virtual String percent_sign(const String &p_language = "") const { return "%"; };
/* GDScript wrappers */
RID _create_font_memory(const PackedByteArray &p_data, const String &p_type, int p_base_size = 16);
Array _shaped_text_get_glyphs(RID p_shaped) const;
Dictionary _shaped_text_get_carets(RID p_shaped, int p_position) const;
void _shaped_text_set_bidi_override(RID p_shaped, const Array &p_override);
Array _shaped_text_get_line_breaks_adv(RID p_shaped, const PackedFloat32Array &p_width, int p_start, bool p_once, uint8_t p_break_flags) const;
Array _shaped_text_get_line_breaks(RID p_shaped, float p_width, int p_start, uint8_t p_break_flags) const;
Array _shaped_text_get_word_breaks(RID p_shaped) const;
Array _shaped_text_get_selection(RID p_shaped, int p_start, int p_end) const;
TextServer();
~TextServer();
};
/*************************************************************************/
class TextServerManager : public Object {
GDCLASS(TextServerManager, Object);
public:
typedef TextServer *(*CreateFunction)(Error &r_error, void *p_user_data);
protected:
static void _bind_methods();
private:
static TextServerManager *singleton;
static TextServer *server;
enum {
MAX_SERVERS = 64
};
struct TextServerCreate {
String name;
CreateFunction create_function = nullptr;
uint32_t features = 0;
TextServer *instance = nullptr;
void *user_data = nullptr;
};
static TextServerCreate server_create_functions[MAX_SERVERS];
static int server_create_count;
public:
_FORCE_INLINE_ static TextServerManager *get_singleton() {
return singleton;
}
static void register_create_function(const String &p_name, uint32_t p_features, CreateFunction p_function, void *p_user_data);
static int get_interface_count();
static String get_interface_name(int p_index);
static uint32_t get_interface_features(int p_index);
static TextServer *initialize(int p_index, Error &r_error);
static TextServer *get_primary_interface();
/* GDScript wrappers */
int _get_interface_count() const;
String _get_interface_name(int p_index) const;
uint32_t _get_interface_features(int p_index) const;
TextServer *_get_interface(int p_index) const;
Array _get_interfaces() const;
TextServer *_find_interface(const String &p_name) const;
bool _set_primary_interface(int p_index);
TextServer *_get_primary_interface() const;
TextServerManager();
~TextServerManager();
};
/*************************************************************************/
#define TS TextServerManager::get_primary_interface()
VARIANT_ENUM_CAST(TextServer::Direction);
VARIANT_ENUM_CAST(TextServer::Orientation);
VARIANT_ENUM_CAST(TextServer::JustificationFlag);
VARIANT_ENUM_CAST(TextServer::LineBreakFlag);
VARIANT_ENUM_CAST(TextServer::GraphemeFlag);
VARIANT_ENUM_CAST(TextServer::Hinting);
VARIANT_ENUM_CAST(TextServer::Feature);
#endif // TEXT_SERVER_H
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