525 lines
12 KiB
C++
525 lines
12 KiB
C++
/*************************************************************************/
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/* dynamic_font_stb.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md) */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "dynamic_font_stb.h"
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#ifndef FREETYPE_ENABLED
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#define STB_TRUETYPE_IMPLEMENTATION
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#include "core/os/file_access.h"
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void DynamicFontData::lock() {
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fr = font_data.read();
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if (fr.ptr() != last_data_ptr) {
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last_data_ptr = fr.ptr();
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if (!stbtt_InitFont(&info, last_data_ptr, 0)) {
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valid = false;
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} else {
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valid = true;
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}
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last_data_ptr = fr.ptr();
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}
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}
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void DynamicFontData::unlock() {
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fr = PoolVector<uint8_t>::Read();
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}
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void DynamicFontData::set_font_data(const PoolVector<uint8_t> &p_font) {
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//clear caches and stuff
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ERR_FAIL_COND(font_data.size());
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font_data = p_font;
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lock();
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if (valid) {
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stbtt_GetFontVMetrics(&info, &ascent, &descent, &linegap);
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descent = -descent + linegap;
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for (int i = 32; i < 1024; i++) {
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for (int j = 32; j < 1024; j++) {
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int kern = stbtt_GetCodepointKernAdvance(&info, i, j);
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if (kern != 0) {
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KerningPairKey kpk;
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kpk.A = i;
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kpk.B = j;
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kerning_map[kpk] = kern;
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}
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}
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}
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}
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unlock();
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//clear existing stuff
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ERR_FAIL_COND(!valid);
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}
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Ref<DynamicFontAtSize> DynamicFontData::_get_dynamic_font_at_size(int p_size) {
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ERR_FAIL_COND_V(!valid, Ref<DynamicFontAtSize>());
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if (size_cache.has(p_size)) {
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return Ref<DynamicFontAtSize>(size_cache[p_size]);
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}
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Ref<DynamicFontAtSize> dfas;
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dfas.instance();
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dfas->font = Ref<DynamicFontData>(this);
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size_cache[p_size] = dfas.ptr();
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dfas->size = p_size;
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lock();
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dfas->scale = stbtt_ScaleForPixelHeight(&info, p_size);
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unlock();
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return dfas;
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}
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DynamicFontData::DynamicFontData() {
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last_data_ptr = NULL;
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valid = false;
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}
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DynamicFontData::~DynamicFontData() {
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}
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////////////////////
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float DynamicFontAtSize::get_height() const {
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return (font->ascent + font->descent) * scale;
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}
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float DynamicFontAtSize::get_ascent() const {
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return font->ascent * scale;
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}
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float DynamicFontAtSize::get_descent() const {
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return font->descent * scale;
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}
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Size2 DynamicFontAtSize::get_char_size(CharType p_char, CharType p_next) const {
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const_cast<DynamicFontAtSize *>(this)->_update_char(p_char);
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const Character *c = char_map.getptr(p_char);
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ERR_FAIL_COND_V(!c, Size2());
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Size2 ret(c->advance, get_height());
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if (p_next) {
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DynamicFontData::KerningPairKey kpk;
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kpk.A = p_char;
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kpk.B = p_next;
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const Map<DynamicFontData::KerningPairKey, int>::Element *K = font->kerning_map.find(kpk);
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if (K) {
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ret.x += K->get() * scale;
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}
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}
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return ret;
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}
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float DynamicFontAtSize::draw_char(RID p_canvas_item, const Point2 &p_pos, CharType p_char, CharType p_next, const Color &p_modulate, bool p_outline) const {
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const_cast<DynamicFontAtSize *>(this)->_update_char(p_char);
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const Character *c = char_map.getptr(p_char);
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if (!c) {
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return 0;
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}
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if (!p_outline) {
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Point2 cpos = p_pos;
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cpos.x += c->h_align;
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cpos.y -= get_ascent();
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cpos.y += c->v_align;
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ERR_FAIL_COND_V(c->texture_idx < -1 || c->texture_idx >= textures.size(), 0);
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if (c->texture_idx != -1)
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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);
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}
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//textures[c->texture_idx].texture->draw(p_canvas_item,Vector2());
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float ret = c->advance;
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if (p_next) {
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DynamicFontData::KerningPairKey kpk;
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kpk.A = p_char;
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kpk.B = p_next;
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const Map<DynamicFontData::KerningPairKey, int>::Element *K = font->kerning_map.find(kpk);
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if (K) {
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ret += K->get() * scale;
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}
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}
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return ret;
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}
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void DynamicFontAtSize::_update_char(CharType p_char) {
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if (char_map.has(p_char))
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return;
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font->lock();
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int w, h, xofs, yofs;
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unsigned char *cpbitmap = stbtt_GetCodepointBitmap(&font->info, scale, scale, p_char, &w, &h, &xofs, &yofs);
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if (!cpbitmap) {
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//no glyph
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int advance;
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stbtt_GetCodepointHMetrics(&font->info, p_char, &advance, 0);
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Character ch;
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ch.texture_idx = -1;
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ch.advance = advance * scale;
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ch.h_align = 0;
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ch.v_align = 0;
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char_map[p_char] = ch;
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font->unlock();
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return;
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}
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int mw = w + rect_margin * 2;
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int mh = h + rect_margin * 2;
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if (mw > 4096 || mh > 4096) {
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stbtt_FreeBitmap(cpbitmap, NULL);
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font->unlock();
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ERR_FAIL_COND(mw > 4096);
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ERR_FAIL_COND(mh > 4096);
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}
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//find a texture to fit this...
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int tex_index = -1;
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int tex_x = 0;
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int tex_y = 0;
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for (int i = 0; i < textures.size(); i++) {
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CharTexture &ct = textures[i];
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if (mw > ct.texture_size || mh > ct.texture_size) //too big for this texture
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continue;
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tex_y = 0x7FFFFFFF;
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tex_x = 0;
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for (int j = 0; j < ct.texture_size - mw; j++) {
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int max_y = 0;
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for (int k = j; k < j + mw; k++) {
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int y = ct.offsets[k];
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if (y > max_y)
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max_y = y;
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}
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if (max_y < tex_y) {
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tex_y = max_y;
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tex_x = j;
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}
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}
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if (tex_y == 0x7FFFFFFF || tex_y + mh > ct.texture_size)
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continue; //fail, could not fit it here
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tex_index = i;
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break;
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}
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if (tex_index == -1) {
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//could not find texture to fit, create one
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tex_x = 0;
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tex_y = 0;
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int texsize = MAX(size * 8, 256);
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if (mw > texsize)
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texsize = mw; //special case, adapt to it?
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if (mh > texsize)
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texsize = mh; //special case, adapt to it?
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texsize = next_power_of_2(texsize);
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texsize = MIN(texsize, 4096);
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CharTexture tex;
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tex.texture_size = texsize;
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tex.imgdata.resize(texsize * texsize * 2); //grayscale alpha
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{
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//zero texture
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PoolVector<uint8_t>::Write w = tex.imgdata.write();
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ERR_FAIL_COND(texsize * texsize * 2 > tex.imgdata.size());
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for (int i = 0; i < texsize * texsize * 2; i++) {
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w[i] = 0;
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}
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}
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tex.offsets.resize(texsize);
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for (int i = 0; i < texsize; i++) //zero offsets
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tex.offsets[i] = 0;
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textures.push_back(tex);
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tex_index = textures.size() - 1;
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}
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//fit character in char texture
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CharTexture &tex = textures[tex_index];
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{
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PoolVector<uint8_t>::Write wr = tex.imgdata.write();
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for (int i = 0; i < h; i++) {
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for (int j = 0; j < w; j++) {
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int ofs = ((i + tex_y + rect_margin) * tex.texture_size + j + tex_x + rect_margin) * 2;
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ERR_FAIL_COND(ofs >= tex.imgdata.size());
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wr[ofs + 0] = 255; //grayscale as 1
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wr[ofs + 1] = cpbitmap[i * w + j]; //alpha as 0
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}
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}
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}
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//blit to image and texture
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{
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Ref<Image> img = memnew(Image(tex.texture_size, tex.texture_size, 0, Image::FORMAT_LA8, tex.imgdata));
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if (tex.texture.is_null()) {
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tex.texture.instance();
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tex.texture->create_from_image(img, Texture::FLAG_FILTER);
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} else {
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tex.texture->set_data(img); //update
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}
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}
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// update height array
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for (int k = tex_x; k < tex_x + mw; k++) {
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tex.offsets[k] = tex_y + mh;
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}
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int advance;
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stbtt_GetCodepointHMetrics(&font->info, p_char, &advance, 0);
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Character chr;
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chr.h_align = xofs;
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chr.v_align = yofs + get_ascent();
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chr.advance = advance * scale;
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chr.texture_idx = tex_index;
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chr.rect = Rect2(tex_x + rect_margin, tex_y + rect_margin, w, h);
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char_map[p_char] = chr;
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stbtt_FreeBitmap(cpbitmap, NULL);
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font->unlock();
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}
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DynamicFontAtSize::DynamicFontAtSize() {
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rect_margin = 1;
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}
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DynamicFontAtSize::~DynamicFontAtSize() {
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ERR_FAIL_COND(!font.ptr());
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font->size_cache.erase(size);
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}
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/////////////////////////
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void DynamicFont::_bind_methods() {
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ClassDB::bind_method(D_METHOD("set_font_data", "data"), &DynamicFont::set_font_data);
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ClassDB::bind_method(D_METHOD("get_font_data"), &DynamicFont::get_font_data);
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ClassDB::bind_method(D_METHOD("set_size", "data"), &DynamicFont::set_size);
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ClassDB::bind_method(D_METHOD("get_size"), &DynamicFont::get_size);
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ADD_PROPERTY(PropertyInfo(Variant::INT, "font/size"), "set_size", "get_size");
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ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "font/font", PROPERTY_HINT_RESOURCE_TYPE, "DynamicFontData"), "set_font_data", "get_font_data");
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}
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void DynamicFont::set_font_data(const Ref<DynamicFontData> &p_data) {
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data = p_data;
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data_at_size = data->_get_dynamic_font_at_size(size);
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}
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Ref<DynamicFontData> DynamicFont::get_font_data() const {
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return data;
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}
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void DynamicFont::set_size(int p_size) {
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if (size == p_size)
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return;
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size = p_size;
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ERR_FAIL_COND(p_size < 1);
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if (!data.is_valid())
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return;
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data_at_size = data->_get_dynamic_font_at_size(size);
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}
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int DynamicFont::get_size() const {
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return size;
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}
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float DynamicFont::get_height() const {
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if (!data_at_size.is_valid())
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return 1;
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return data_at_size->get_height();
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}
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float DynamicFont::get_ascent() const {
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if (!data_at_size.is_valid())
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return 1;
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return data_at_size->get_ascent();
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}
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float DynamicFont::get_descent() const {
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if (!data_at_size.is_valid())
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return 1;
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return data_at_size->get_descent();
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}
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Size2 DynamicFont::get_char_size(CharType p_char, CharType p_next) const {
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if (!data_at_size.is_valid())
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return Size2(1, 1);
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return data_at_size->get_char_size(p_char, p_next);
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}
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bool DynamicFont::is_distance_field_hint() const {
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return false;
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}
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float DynamicFont::draw_char(RID p_canvas_item, const Point2 &p_pos, CharType p_char, CharType p_next, const Color &p_modulate, bool p_outline) const {
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if (!data_at_size.is_valid())
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return 0;
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return data_at_size->draw_char(p_canvas_item, p_pos, p_char, p_next, p_modulate, p_outline);
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}
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DynamicFont::DynamicFont() {
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size = 16;
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}
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DynamicFont::~DynamicFont() {
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}
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/////////////////////////
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RES ResourceFormatLoaderDynamicFont::load(const String &p_path, const String &p_original_path, Error *r_error) {
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if (r_error)
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*r_error = ERR_FILE_CANT_OPEN;
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FileAccess *f = FileAccess::open(p_path, FileAccess::READ);
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ERR_FAIL_COND_V(!f, RES());
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PoolVector<uint8_t> data;
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data.resize(f->get_len());
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ERR_FAIL_COND_V(data.size() == 0, RES());
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{
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PoolVector<uint8_t>::Write w = data.write();
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f->get_buffer(w.ptr(), data.size());
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}
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Ref<DynamicFontData> dfd;
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dfd.instance();
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dfd->set_font_data(data);
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if (r_error)
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*r_error = OK;
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return dfd;
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}
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void ResourceFormatLoaderDynamicFont::get_recognized_extensions(List<String> *p_extensions) const {
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p_extensions->push_back("ttf");
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}
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bool ResourceFormatLoaderDynamicFont::handles_type(const String &p_type) const {
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return (p_type == "DynamicFontData");
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}
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String ResourceFormatLoaderDynamicFont::get_resource_type(const String &p_path) const {
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String el = p_path.get_extension().to_lower();
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if (el == "ttf")
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return "DynamicFontData";
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return "";
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}
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#endif
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