virtualx-engine/scene/resources/dynamic_font.cpp

/*************************************************************************/
/*  dynamic_font.cpp                                                     */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* 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.                */
/*************************************************************************/
#ifdef FREETYPE_ENABLED
#include "dynamic_font.h"
#include "os/file_access.h"
#include "os/os.h"

bool DynamicFontData::CacheID::operator<(CacheID right) const {

	if (size < right.size)
		return true;
	if (mipmaps != right.mipmaps)
		return right.mipmaps;
	if (filter != right.filter)
		return right.filter;
	return false;
}

Ref<DynamicFontAtSize> DynamicFontData::_get_dynamic_font_at_size(CacheID p_id) {

	if (size_cache.has(p_id)) {
		return Ref<DynamicFontAtSize>(size_cache[p_id]);
	}

	Ref<DynamicFontAtSize> dfas;

	dfas.instance();

	dfas->font = Ref<DynamicFontData>(this);

	size_cache[p_id] = dfas.ptr();
	dfas->id = p_id;
	dfas->_load();

	return dfas;
}

void DynamicFontData::set_font_ptr(const uint8_t *p_font_mem, int p_font_mem_size) {

	font_mem = p_font_mem;
	font_mem_size = p_font_mem_size;
}

void DynamicFontData::set_font_path(const String &p_path) {

	font_path = p_path;
}

String DynamicFontData::get_font_path() const {
	return font_path;
}

void DynamicFontData::set_force_autohinter(bool p_force) {

	force_autohinter = p_force;
}

void DynamicFontData::_bind_methods() {
	ObjectTypeDB::bind_method(_MD("set_font_path", "path"), &DynamicFontData::set_font_path);
	ObjectTypeDB::bind_method(_MD("get_font_path"), &DynamicFontData::get_font_path);

	ADD_PROPERTY(PropertyInfo(Variant::STRING, "font_path", PROPERTY_HINT_FILE, "*.ttf,*.otf"), _SCS("set_font_path"), _SCS("get_font_path"));
}

DynamicFontData::DynamicFontData() {

	force_autohinter = false;
	font_mem = NULL;
	font_mem_size = 0;
}

DynamicFontData::~DynamicFontData() {
}

////////////////////
HashMap<String, Vector<uint8_t> > DynamicFontAtSize::_fontdata;

Error DynamicFontAtSize::_load() {

	int error = FT_Init_FreeType(&library);

	ERR_EXPLAIN(TTR("Error initializing FreeType."));
	ERR_FAIL_COND_V(error != 0, ERR_CANT_CREATE);

	// FT_OPEN_STREAM is extremely slow only on Android.
	if (OS::get_singleton()->get_name() == "Android" && font->font_mem == NULL && font->font_path != String()) {
		// cache font only once for each font->font_path
		if (_fontdata.has(font->font_path)) {

			font->set_font_ptr(_fontdata[font->font_path].ptr(), _fontdata[font->font_path].size());

		} else {

			FileAccess *f = FileAccess::open(font->font_path, FileAccess::READ);
			ERR_FAIL_COND_V(!f, ERR_CANT_OPEN);

			size_t len = f->get_len();
			_fontdata[font->font_path] = Vector<uint8_t>();
			Vector<uint8_t> &fontdata = _fontdata[font->font_path];
			fontdata.resize(len);
			f->get_buffer(fontdata.ptr(), len);
			font->set_font_ptr(fontdata.ptr(), len);
			f->close();
		}
	}

	if (font->font_mem == NULL && font->font_path != String()) {

		FileAccess *f = FileAccess::open(font->font_path, FileAccess::READ);
		ERR_FAIL_COND_V(!f, ERR_CANT_OPEN);

		memset(&stream, 0, sizeof(FT_StreamRec));
		stream.base = NULL;
		stream.size = f->get_len();
		stream.pos = 0;
		stream.descriptor.pointer = f;
		stream.read = _ft_stream_io;
		stream.close = _ft_stream_close;

		FT_Open_Args fargs;
		memset(&fargs, 0, sizeof(FT_Open_Args));
		fargs.flags = FT_OPEN_STREAM;
		fargs.stream = &stream;
		error = FT_Open_Face(library, &fargs, 0, &face);
	} else if (font->font_mem) {

		memset(&stream, 0, sizeof(FT_StreamRec));
		stream.base = (unsigned char *)font->font_mem;
		stream.size = font->font_mem_size;
		stream.pos = 0;

		FT_Open_Args fargs;
		memset(&fargs, 0, sizeof(FT_Open_Args));
		fargs.memory_base = (unsigned char *)font->font_mem;
		fargs.memory_size = font->font_mem_size;
		fargs.flags = FT_OPEN_MEMORY;
		fargs.stream = &stream;
		error = FT_Open_Face(library, &fargs, 0, &face);

	} else {
		ERR_EXPLAIN("DynamicFont uninitialized");
		ERR_FAIL_V(ERR_UNCONFIGURED);
	}

	//error = FT_New_Face( library, src_path.utf8().get_data(),0,&face );

	if (error == FT_Err_Unknown_File_Format) {
		ERR_EXPLAIN(TTR("Unknown font format."));
		FT_Done_FreeType(library);

	} else if (error) {

		ERR_EXPLAIN(TTR("Error loading font."));
		FT_Done_FreeType(library);
	}

	ERR_FAIL_COND_V(error, ERR_FILE_CANT_OPEN);

	/*error = FT_Set_Char_Size(face,0,64*size,512,512);

	if ( error ) {
		FT_Done_FreeType( library );
		ERR_EXPLAIN(TTR("Invalid font size."));
		ERR_FAIL_COND_V( error, ERR_INVALID_PARAMETER );
	}*/

	error = FT_Set_Pixel_Sizes(face, 0, id.size);

	ascent = face->size->metrics.ascender >> 6;
	descent = -face->size->metrics.descender >> 6;
	linegap = 0;
	texture_flags = 0;
	if (id.mipmaps)
		texture_flags |= Texture::FLAG_MIPMAPS;
	if (id.filter)
		texture_flags |= Texture::FLAG_FILTER;

	//print_line("ASCENT: "+itos(ascent)+" descent "+itos(descent)+" hinted: "+itos(face->face_flags&FT_FACE_FLAG_HINTER));

	valid = true;
	return OK;
}

float DynamicFontAtSize::get_height() const {

	return ascent + descent;
}

float DynamicFontAtSize::get_ascent() const {

	return ascent;
}
float DynamicFontAtSize::get_descent() const {

	return descent;
}

Size2 DynamicFontAtSize::get_char_size(CharType p_char, CharType p_next, const Vector<Ref<DynamicFontAtSize> > &p_fallbacks) const {

	if (!valid)
		return Size2(1, 1);
	const_cast<DynamicFontAtSize *>(this)->_update_char(p_char);

	const Character *c = char_map.getptr(p_char);
	ERR_FAIL_COND_V(!c, Size2());

	Size2 ret(0, get_height());

	if (!c->found) {

		//not found, try in fallbacks
		for (int i = 0; i < p_fallbacks.size(); i++) {

			DynamicFontAtSize *fb = const_cast<DynamicFontAtSize *>(p_fallbacks[i].ptr());
			if (!fb->valid)
				continue;

			fb->_update_char(p_char);
			const Character *ch = fb->char_map.getptr(p_char);
			ERR_CONTINUE(!ch);

			if (!ch->found)
				continue;

			c = ch;
			break;
		}
		//not found, try 0xFFFD to display 'not found'.

		if (!c->found) {

			const_cast<DynamicFontAtSize *>(this)->_update_char(0xFFFD);
			c = char_map.getptr(0xFFFD);
			ERR_FAIL_COND_V(!c, Size2());
		}
	}

	if (c->found) {
		ret.x = c->advance;
	}

	if (p_next) {
		FT_Vector delta;
		FT_Get_Kerning(face, p_char, p_next, FT_KERNING_DEFAULT, &delta);

		if (delta.x == 0) {
			for (int i = 0; i < p_fallbacks.size(); i++) {

				DynamicFontAtSize *fb = const_cast<DynamicFontAtSize *>(p_fallbacks[i].ptr());
				if (!fb->valid)
					continue;

				FT_Get_Kerning(fb->face, p_char, p_next, FT_KERNING_DEFAULT, &delta);

				if (delta.x == 0)
					continue;

				ret.x += delta.x >> 6;
				break;
			}
		} else {
			ret.x += delta.x >> 6;
		}
	}

	return ret;
}

void DynamicFontAtSize::set_texture_flags(uint32_t p_flags) {

	texture_flags = p_flags;
	for (int i = 0; i < textures.size(); i++) {
		Ref<ImageTexture> &tex = textures[i].texture;
		if (!tex.is_null())
			tex->set_flags(p_flags);
	}
}

float DynamicFontAtSize::draw_char(RID p_canvas_item, const Point2 &p_pos, CharType p_char, CharType p_next, const Color &p_modulate, const Vector<Ref<DynamicFontAtSize> > &p_fallbacks) const {

	if (!valid)
		return 0;

	const_cast<DynamicFontAtSize *>(this)->_update_char(p_char);

	const Character *c = char_map.getptr(p_char);

	float advance = 0;

	if (!c->found) {

		//not found, try in fallbacks
		bool used_fallback = false;

		for (int i = 0; i < p_fallbacks.size(); i++) {

			DynamicFontAtSize *fb = const_cast<DynamicFontAtSize *>(p_fallbacks[i].ptr());
			if (!fb->valid)
				continue;

			fb->_update_char(p_char);
			const Character *ch = fb->char_map.getptr(p_char);
			ERR_CONTINUE(!ch);

			if (!ch->found)
				continue;

			Point2 cpos = p_pos;
			cpos.x += ch->h_align;
			cpos.y -= get_ascent();
			cpos.y += ch->v_align;
			ERR_FAIL_COND_V(ch->texture_idx < -1 || ch->texture_idx >= fb->textures.size(), 0);
			if (ch->texture_idx != -1)
				VisualServer::get_singleton()->canvas_item_add_texture_rect_region(p_canvas_item, Rect2(cpos, ch->rect.size), fb->textures[ch->texture_idx].texture->get_rid(), ch->rect, p_modulate);
			advance = ch->advance;
			used_fallback = true;
			break;
		}
		//not found, try 0xFFFD to display 'not found'.

		if (!used_fallback) {

			const_cast<DynamicFontAtSize *>(this)->_update_char(0xFFFD);
			c = char_map.getptr(0xFFFD);
		}
	}

	if (c->found) {

		Point2 cpos = p_pos;
		cpos.x += c->h_align;
		cpos.y -= get_ascent();
		cpos.y += c->v_align;
		ERR_FAIL_COND_V(c->texture_idx < -1 || c->texture_idx >= textures.size(), 0);
		if (c->texture_idx != -1)
			VisualServer::get_singleton()->canvas_item_add_texture_rect_region(p_canvas_item, Rect2(cpos, c->rect.size), textures[c->texture_idx].texture->get_rid(), c->rect, p_modulate);
		advance = c->advance;
		//textures[c->texture_idx].texture->draw(p_canvas_item,Vector2());
	}

	if (p_next) {

		FT_Vector delta;
		FT_Get_Kerning(face, p_char, p_next, FT_KERNING_DEFAULT, &delta);

		if (delta.x == 0) {
			for (int i = 0; i < p_fallbacks.size(); i++) {

				DynamicFontAtSize *fb = const_cast<DynamicFontAtSize *>(p_fallbacks[i].ptr());
				if (!fb->valid)
					continue;

				FT_Get_Kerning(fb->face, p_char, p_next, FT_KERNING_DEFAULT, &delta);

				if (delta.x == 0)
					continue;

				advance += delta.x >> 6;
				break;
			}
		} else {
			advance += delta.x >> 6;
		}
	}

	return advance;
}

unsigned long DynamicFontAtSize::_ft_stream_io(FT_Stream stream, unsigned long offset, unsigned char *buffer, unsigned long count) {

	FileAccess *f = (FileAccess *)stream->descriptor.pointer;

	if (f->get_pos() != offset) {
		f->seek(offset);
	}

	if (count == 0)
		return 0;

	return f->get_buffer(buffer, count);
}
void DynamicFontAtSize::_ft_stream_close(FT_Stream stream) {

	FileAccess *f = (FileAccess *)stream->descriptor.pointer;
	f->close();
	memdelete(f);
}

void DynamicFontAtSize::_update_char(CharType p_char) {

	if (char_map.has(p_char))
		return;

	_THREAD_SAFE_METHOD_

	FT_GlyphSlot slot = face->glyph;

	if (FT_Get_Char_Index(face, p_char) == 0) {
		//not found
		Character ch;
		ch.texture_idx = -1;
		ch.advance = 0;
		ch.h_align = 0;
		ch.v_align = 0;
		ch.found = false;

		char_map[p_char] = ch;
		return;
	}
	int error = FT_Load_Char(face, p_char, FT_LOAD_RENDER | (font->force_autohinter ? FT_LOAD_FORCE_AUTOHINT : 0));
	if (!error) {
		error = FT_Render_Glyph(face->glyph, ft_render_mode_normal);
	}
	if (error) {

		int advance = 0;
		//stbtt_GetCodepointHMetrics(&font->info, p_char, &advance, 0);
		//print_line("char has no bitmap: "+itos(p_char)+" but advance is "+itos(advance*scale));
		Character ch;
		ch.texture_idx = -1;
		ch.advance = advance;
		ch.h_align = 0;
		ch.v_align = 0;
		ch.found = false;

		char_map[p_char] = ch;

		return;
	}

	int w = slot->bitmap.width;
	int h = slot->bitmap.rows;
	//int p = slot->bitmap.pitch;
	int yofs = slot->bitmap_top;
	int xofs = slot->bitmap_left;
	int advance = slot->advance.x >> 6;

	int mw = w + rect_margin * 2;
	int mh = h + rect_margin * 2;

	if (mw > 4096 || mh > 4096) {

		ERR_FAIL_COND(mw > 4096);
		ERR_FAIL_COND(mh > 4096);
	}

	//find a texture to fit this...

	int tex_index = -1;
	int tex_x = 0;
	int tex_y = 0;

	for (int i = 0; i < textures.size(); i++) {

		CharTexture &ct = textures[i];

		if (mw > ct.texture_size || mh > ct.texture_size) //too big for this texture
			continue;

		tex_y = 0x7FFFFFFF;
		tex_x = 0;

		for (int j = 0; j < ct.texture_size - mw; j++) {

			int max_y = 0;

			for (int k = j; k < j + mw; k++) {

				int y = ct.offsets[k];
				if (y > max_y)
					max_y = y;
			}

			if (max_y < tex_y) {
				tex_y = max_y;
				tex_x = j;
			}
		}

		if (tex_y == 0x7FFFFFFF || tex_y + mh > ct.texture_size)
			continue; //fail, could not fit it here

		tex_index = i;
		break;
	}

	//	print_line("CHAR: "+String::chr(p_char)+" TEX INDEX: "+itos(tex_index)+" X: "+itos(tex_x)+" Y: "+itos(tex_y));

	if (tex_index == -1) {
		//could not find texture to fit, create one
		tex_x = 0;
		tex_y = 0;

		int texsize = MAX(id.size * 8, 256);
		if (mw > texsize)
			texsize = mw; //special case, adapt to it?
		if (mh > texsize)
			texsize = mh; //special case, adapt to it?

		texsize = nearest_power_of_2(texsize);

		texsize = MIN(texsize, 4096);

		CharTexture tex;
		tex.texture_size = texsize;
		tex.imgdata.resize(texsize * texsize * 2); //grayscale alpha

		{
			//zero texture
			DVector<uint8_t>::Write w = tex.imgdata.write();
			ERR_FAIL_COND(texsize * texsize * 2 > tex.imgdata.size());
			for (int i = 0; i < texsize * texsize * 2; i++) {
				w[i] = 0;
			}
		}
		tex.offsets.resize(texsize);
		for (int i = 0; i < texsize; i++) //zero offsets
			tex.offsets[i] = 0;

		textures.push_back(tex);
		tex_index = textures.size() - 1;
	}

	//fit character in char texture

	CharTexture &tex = textures[tex_index];

	{
		DVector<uint8_t>::Write wr = tex.imgdata.write();

		for (int i = 0; i < h; i++) {
			for (int j = 0; j < w; j++) {

				int ofs = ((i + tex_y + rect_margin) * tex.texture_size + j + tex_x + rect_margin) * 2;
				ERR_FAIL_COND(ofs >= tex.imgdata.size());
				wr[ofs + 0] = 255; //grayscale as 1
				wr[ofs + 1] = slot->bitmap.buffer[i * slot->bitmap.width + j];
			}
		}
	}

	//blit to image and texture
	{

		Image img(tex.texture_size, tex.texture_size, 0, Image::FORMAT_GRAYSCALE_ALPHA, tex.imgdata);

		if (tex.texture.is_null()) {
			tex.texture.instance();
			tex.texture->create_from_image(img, Texture::FLAG_VIDEO_SURFACE | texture_flags);
		} else {
			tex.texture->set_data(img); //update
		}
	}

	// update height array

	for (int k = tex_x; k < tex_x + mw; k++) {

		tex.offsets[k] = tex_y + mh;
	}

	Character chr;
	chr.h_align = xofs;
	chr.v_align = ascent - yofs; // + ascent - descent;
	chr.advance = advance;
	chr.texture_idx = tex_index;
	chr.found = true;

	chr.rect = Rect2(tex_x + rect_margin, tex_y + rect_margin, w, h);

	//print_line("CHAR: "+String::chr(p_char)+" TEX INDEX: "+itos(tex_index)+" RECT: "+chr.rect+" X OFS: "+itos(xofs)+" Y OFS: "+itos(yofs));

	char_map[p_char] = chr;
}

DynamicFontAtSize::DynamicFontAtSize() {

	valid = false;
	rect_margin = 1;
	ascent = 1;
	descent = 1;
	linegap = 1;
	texture_flags = 0;
}

DynamicFontAtSize::~DynamicFontAtSize() {

	if (valid) {
		FT_Done_FreeType(library);
		font->size_cache.erase(id);
	}
}

/////////////////////////

void DynamicFont::_reload_cache() {

	ERR_FAIL_COND(cache_id.size < 1);
	if (!data.is_valid())
		return;
	data_at_size = data->_get_dynamic_font_at_size(cache_id);
	for (int i = 0; i < fallbacks.size(); i++) {
		fallback_data_at_size[i] = fallbacks[i]->_get_dynamic_font_at_size(cache_id);
	}

	emit_changed();
	_change_notify();
}

void DynamicFont::set_font_data(const Ref<DynamicFontData> &p_data) {

	data = p_data;
	if (data.is_valid())
		data_at_size = data->_get_dynamic_font_at_size(cache_id);
	else
		data_at_size = Ref<DynamicFontAtSize>();

	emit_changed();
}

Ref<DynamicFontData> DynamicFont::get_font_data() const {

	return data;
}

void DynamicFont::set_size(int p_size) {

	if (cache_id.size == p_size)
		return;
	cache_id.size = p_size;
	_reload_cache();
}

int DynamicFont::get_size() const {

	return cache_id.size;
}

bool DynamicFont::get_use_mipmaps() const {

	return cache_id.mipmaps;
}

void DynamicFont::set_use_mipmaps(bool p_enable) {

	if (cache_id.mipmaps == p_enable)
		return;
	cache_id.mipmaps = p_enable;
	_reload_cache();
}

bool DynamicFont::get_use_filter() const {

	return cache_id.filter;
}

void DynamicFont::set_use_filter(bool p_enable) {

	if (cache_id.filter == p_enable)
		return;
	cache_id.filter = p_enable;
	_reload_cache();
}

int DynamicFont::get_spacing(int p_type) const {

	if (p_type == SPACING_TOP) {
		return spacing_top;
	} else if (p_type == SPACING_BOTTOM) {
		return spacing_bottom;
	} else if (p_type == SPACING_CHAR) {
		return spacing_char;
	} else if (p_type == SPACING_SPACE) {
		return spacing_space;
	}

	return 0;
}

void DynamicFont::set_spacing(int p_type, int p_value) {

	if (p_type == SPACING_TOP) {
		spacing_top = p_value;
	} else if (p_type == SPACING_BOTTOM) {
		spacing_bottom = p_value;
	} else if (p_type == SPACING_CHAR) {
		spacing_char = p_value;
	} else if (p_type == SPACING_SPACE) {
		spacing_space = p_value;
	}

	emit_changed();
	_change_notify();
}

float DynamicFont::get_height() const {

	if (!data_at_size.is_valid())
		return 1;

	return data_at_size->get_height() + spacing_top + spacing_bottom;
}

float DynamicFont::get_ascent() const {

	if (!data_at_size.is_valid())
		return 1;

	return data_at_size->get_ascent() + spacing_top;
}

float DynamicFont::get_descent() const {

	if (!data_at_size.is_valid())
		return 1;

	return data_at_size->get_descent() + spacing_bottom;
}

Size2 DynamicFont::get_char_size(CharType p_char, CharType p_next) const {

	if (!data_at_size.is_valid())
		return Size2(1, 1);

	Size2 ret = data_at_size->get_char_size(p_char, p_next, fallback_data_at_size);
	if (p_char == ' ')
		ret.width += spacing_space + spacing_char;
	else if (p_next)
		ret.width += spacing_char;

	return ret;
}

bool DynamicFont::is_distance_field_hint() const {

	return false;
}

float DynamicFont::draw_char(RID p_canvas_item, const Point2 &p_pos, CharType p_char, CharType p_next, const Color &p_modulate) const {

	if (!data_at_size.is_valid())
		return 0;

	return data_at_size->draw_char(p_canvas_item, p_pos, p_char, p_next, p_modulate, fallback_data_at_size) + spacing_char;
}
void DynamicFont::set_fallback(int p_idx, const Ref<DynamicFontData> &p_data) {

	ERR_FAIL_COND(p_data.is_null());
	ERR_FAIL_INDEX(p_idx, fallbacks.size());
	fallbacks[p_idx] = p_data;
	fallback_data_at_size[p_idx] = fallbacks[p_idx]->_get_dynamic_font_at_size(cache_id);
}

void DynamicFont::add_fallback(const Ref<DynamicFontData> &p_data) {

	ERR_FAIL_COND(p_data.is_null());
	fallbacks.push_back(p_data);
	fallback_data_at_size.push_back(fallbacks[fallbacks.size() - 1]->_get_dynamic_font_at_size(cache_id)); //const..

	_change_notify();
	emit_changed();
	_change_notify();
}

int DynamicFont::get_fallback_count() const {
	return fallbacks.size();
}
Ref<DynamicFontData> DynamicFont::get_fallback(int p_idx) const {

	ERR_FAIL_INDEX_V(p_idx, fallbacks.size(), Ref<DynamicFontData>());

	return fallbacks[p_idx];
}
void DynamicFont::remove_fallback(int p_idx) {

	ERR_FAIL_INDEX(p_idx, fallbacks.size());
	fallbacks.remove(p_idx);
	fallback_data_at_size.remove(p_idx);
	emit_changed();
	_change_notify();
}

bool DynamicFont::_set(const StringName &p_name, const Variant &p_value) {

	String str = p_name;
	if (str.begins_with("fallback/")) {
		int idx = str.get_slicec('/', 1).to_int();
		Ref<DynamicFontData> fd = p_value;

		if (fd.is_valid()) {
			if (idx == fallbacks.size()) {
				add_fallback(fd);
				return true;
			} else if (idx >= 0 && idx < fallbacks.size()) {
				set_fallback(idx, fd);
				return true;
			} else {
				return false;
			}
		} else if (idx >= 0 && idx < fallbacks.size()) {
			remove_fallback(idx);
			return true;
		}
	}

	return false;
}

bool DynamicFont::_get(const StringName &p_name, Variant &r_ret) const {

	String str = p_name;
	if (str.begins_with("fallback/")) {
		int idx = str.get_slicec('/', 1).to_int();

		if (idx == fallbacks.size()) {
			r_ret = Ref<DynamicFontData>();
			return true;
		} else if (idx >= 0 && idx < fallbacks.size()) {
			r_ret = get_fallback(idx);
			return true;
		}
	}

	return false;
}
void DynamicFont::_get_property_list(List<PropertyInfo> *p_list) const {

	for (int i = 0; i < fallbacks.size(); i++) {
		p_list->push_back(PropertyInfo(Variant::OBJECT, "fallback/" + itos(i), PROPERTY_HINT_RESOURCE_TYPE, "DynamicFontData"));
	}

	p_list->push_back(PropertyInfo(Variant::OBJECT, "fallback/" + itos(fallbacks.size()), PROPERTY_HINT_RESOURCE_TYPE, "DynamicFontData"));
}

void DynamicFont::_bind_methods() {

	ObjectTypeDB::bind_method(_MD("set_font_data", "data:DynamicFontData"), &DynamicFont::set_font_data);
	ObjectTypeDB::bind_method(_MD("get_font_data:DynamicFontData"), &DynamicFont::get_font_data);

	ObjectTypeDB::bind_method(_MD("set_size", "data"), &DynamicFont::set_size);
	ObjectTypeDB::bind_method(_MD("get_size"), &DynamicFont::get_size);

	ObjectTypeDB::bind_method(_MD("set_use_mipmaps", "enable"), &DynamicFont::set_use_mipmaps);
	ObjectTypeDB::bind_method(_MD("get_use_mipmaps"), &DynamicFont::get_use_mipmaps);
	ObjectTypeDB::bind_method(_MD("set_use_filter", "enable"), &DynamicFont::set_use_filter);
	ObjectTypeDB::bind_method(_MD("get_use_filter"), &DynamicFont::get_use_filter);
	ObjectTypeDB::bind_method(_MD("set_spacing", "type", "value"), &DynamicFont::set_spacing);
	ObjectTypeDB::bind_method(_MD("get_spacing", "type"), &DynamicFont::get_spacing);

	ObjectTypeDB::bind_method(_MD("add_fallback", "data:DynamicFontData"), &DynamicFont::add_fallback);
	ObjectTypeDB::bind_method(_MD("set_fallback", "idx", "data:DynamicFontData"), &DynamicFont::set_fallback);
	ObjectTypeDB::bind_method(_MD("get_fallback:DynamicFontData", "idx"), &DynamicFont::get_fallback);
	ObjectTypeDB::bind_method(_MD("remove_fallback", "idx"), &DynamicFont::remove_fallback);
	ObjectTypeDB::bind_method(_MD("get_fallback_count"), &DynamicFont::get_fallback_count);

	ADD_PROPERTY(PropertyInfo(Variant::INT, "font/size"), _SCS("set_size"), _SCS("get_size"));
	ADD_PROPERTYINZ(PropertyInfo(Variant::INT, "extra_spacing/top"), _SCS("set_spacing"), _SCS("get_spacing"), SPACING_TOP);
	ADD_PROPERTYINZ(PropertyInfo(Variant::INT, "extra_spacing/bottom"), _SCS("set_spacing"), _SCS("get_spacing"), SPACING_BOTTOM);
	ADD_PROPERTYINZ(PropertyInfo(Variant::INT, "extra_spacing/char"), _SCS("set_spacing"), _SCS("get_spacing"), SPACING_CHAR);
	ADD_PROPERTYINZ(PropertyInfo(Variant::INT, "extra_spacing/space"), _SCS("set_spacing"), _SCS("get_spacing"), SPACING_SPACE);
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "font/use_mipmaps"), _SCS("set_use_mipmaps"), _SCS("get_use_mipmaps"));
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "font/use_filter"), _SCS("set_use_filter"), _SCS("get_use_filter"));
	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "font/font", PROPERTY_HINT_RESOURCE_TYPE, "DynamicFontData"), _SCS("set_font_data"), _SCS("get_font_data"));

	BIND_CONSTANT(SPACING_TOP);
	BIND_CONSTANT(SPACING_BOTTOM);
	BIND_CONSTANT(SPACING_CHAR);
	BIND_CONSTANT(SPACING_SPACE);
}

DynamicFont::DynamicFont() {

	spacing_top = 0;
	spacing_bottom = 0;
	spacing_char = 0;
	spacing_space = 0;
}

DynamicFont::~DynamicFont() {
}

/////////////////////////

RES ResourceFormatLoaderDynamicFont::load(const String &p_path, const String &p_original_path, Error *r_error) {

	if (r_error)
		*r_error = ERR_FILE_CANT_OPEN;

	Ref<DynamicFontData> dfont;
	dfont.instance();
	dfont->set_font_path(p_path);

	if (r_error)
		*r_error = OK;

	return dfont;
}

void ResourceFormatLoaderDynamicFont::get_recognized_extensions(List<String> *p_extensions) const {

	p_extensions->push_back("ttf");
	p_extensions->push_back("otf");
}

bool ResourceFormatLoaderDynamicFont::handles_type(const String &p_type) const {

	return (p_type == "DynamicFontData");
}

String ResourceFormatLoaderDynamicFont::get_resource_type(const String &p_path) const {

	String el = p_path.extension().to_lower();
	if (el == "ttf" || el == "otf")
		return "DynamicFontData";
	return "";
}

#endif