godot/scene/resources/dynamic_font_stb.cpp
2017-04-08 00:11:42 +02:00

529 lines
12 KiB
C++

/*************************************************************************/
/* dynamic_font_stb.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2017 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. */
/*************************************************************************/
#include "dynamic_font_stb.h"
#ifndef FREETYPE_ENABLED
#define STB_TRUETYPE_IMPLEMENTATION
#include "os/file_access.h"
#include "stb_truetype.h"
void DynamicFontData::lock() {
fr = font_data.read();
if (fr.ptr() != last_data_ptr) {
last_data_ptr = fr.ptr();
if (!stbtt_InitFont(&info, last_data_ptr, 0)) {
valid = false;
} else {
valid = true;
}
last_data_ptr = fr.ptr();
}
}
void DynamicFontData::unlock() {
fr = PoolVector<uint8_t>::Read();
}
void DynamicFontData::set_font_data(const PoolVector<uint8_t> &p_font) {
//clear caches and stuff
ERR_FAIL_COND(font_data.size());
font_data = p_font;
lock();
if (valid) {
stbtt_GetFontVMetrics(&info, &ascent, &descent, &linegap);
descent = -descent + linegap;
for (int i = 32; i < 1024; i++) {
for (int j = 32; j < 1024; j++) {
int kern = stbtt_GetCodepointKernAdvance(&info, i, j);
if (kern != 0) {
KerningPairKey kpk;
kpk.A = i;
kpk.B = j;
kerning_map[kpk] = kern;
}
}
}
}
unlock();
//clear existing stuff
ERR_FAIL_COND(!valid);
}
Ref<DynamicFontAtSize> DynamicFontData::_get_dynamic_font_at_size(int p_size) {
ERR_FAIL_COND_V(!valid, Ref<DynamicFontAtSize>());
if (size_cache.has(p_size)) {
return Ref<DynamicFontAtSize>(size_cache[p_size]);
}
Ref<DynamicFontAtSize> dfas;
dfas.instance();
dfas->font = Ref<DynamicFontData>(this);
size_cache[p_size] = dfas.ptr();
dfas->size = p_size;
lock();
dfas->scale = stbtt_ScaleForPixelHeight(&info, p_size);
unlock();
return dfas;
}
DynamicFontData::DynamicFontData() {
last_data_ptr = NULL;
valid = false;
}
DynamicFontData::~DynamicFontData() {
}
////////////////////
float DynamicFontAtSize::get_height() const {
return (font->ascent + font->descent) * scale;
}
float DynamicFontAtSize::get_ascent() const {
return font->ascent * scale;
}
float DynamicFontAtSize::get_descent() const {
return font->descent * scale;
}
Size2 DynamicFontAtSize::get_char_size(CharType p_char, CharType p_next) const {
const_cast<DynamicFontAtSize *>(this)->_update_char(p_char);
const Character *c = char_map.getptr(p_char);
ERR_FAIL_COND_V(!c, Size2());
Size2 ret(c->advance, get_height());
if (p_next) {
DynamicFontData::KerningPairKey kpk;
kpk.A = p_char;
kpk.B = p_next;
const Map<DynamicFontData::KerningPairKey, int>::Element *K = font->kerning_map.find(kpk);
if (K) {
ret.x += K->get() * scale;
}
}
return ret;
}
float DynamicFontAtSize::draw_char(RID p_canvas_item, const Point2 &p_pos, CharType p_char, CharType p_next, const Color &p_modulate) const {
const_cast<DynamicFontAtSize *>(this)->_update_char(p_char);
const Character *c = char_map.getptr(p_char);
if (!c) {
return 0;
}
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);
//textures[c->texture_idx].texture->draw(p_canvas_item,Vector2());
float ret = c->advance;
if (p_next) {
DynamicFontData::KerningPairKey kpk;
kpk.A = p_char;
kpk.B = p_next;
const Map<DynamicFontData::KerningPairKey, int>::Element *K = font->kerning_map.find(kpk);
if (K) {
ret += K->get() * scale;
}
}
return ret;
}
void DynamicFontAtSize::_update_char(CharType p_char) {
if (char_map.has(p_char))
return;
font->lock();
int w, h, xofs, yofs;
unsigned char *cpbitmap = stbtt_GetCodepointBitmap(&font->info, scale, scale, p_char, &w, &h, &xofs, &yofs);
if (!cpbitmap) {
//no glyph
int advance;
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 * scale;
ch.h_align = 0;
ch.v_align = 0;
char_map[p_char] = ch;
font->unlock();
return;
}
int mw = w + rect_margin * 2;
int mh = h + rect_margin * 2;
if (mw > 4096 || mh > 4096) {
stbtt_FreeBitmap(cpbitmap, NULL);
font->unlock();
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(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
PoolVector<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];
{
PoolVector<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] = cpbitmap[i * w + j]; //alpha as 0
}
}
}
//blit to image and texture
{
Image img(tex.texture_size, tex.texture_size, 0, Image::FORMAT_LA8, tex.imgdata);
if (tex.texture.is_null()) {
tex.texture.instance();
tex.texture->create_from_image(img, Texture::FLAG_FILTER);
} 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;
}
int advance;
stbtt_GetCodepointHMetrics(&font->info, p_char, &advance, 0);
Character chr;
chr.h_align = xofs;
chr.v_align = yofs + get_ascent();
chr.advance = advance * scale;
chr.texture_idx = tex_index;
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;
stbtt_FreeBitmap(cpbitmap, NULL);
font->unlock();
}
DynamicFontAtSize::DynamicFontAtSize() {
rect_margin = 1;
}
DynamicFontAtSize::~DynamicFontAtSize() {
ERR_FAIL_COND(!font.ptr());
font->size_cache.erase(size);
}
/////////////////////////
void DynamicFont::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_font_data", "data:DynamicFontData"), &DynamicFont::set_font_data);
ClassDB::bind_method(D_METHOD("get_font_data:DynamicFontData"), &DynamicFont::get_font_data);
ClassDB::bind_method(D_METHOD("set_size", "data"), &DynamicFont::set_size);
ClassDB::bind_method(D_METHOD("get_size"), &DynamicFont::get_size);
ADD_PROPERTY(PropertyInfo(Variant::INT, "font/size"), "set_size", "get_size");
ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "font/font", PROPERTY_HINT_RESOURCE_TYPE, "DynamicFontData"), "set_font_data", "get_font_data");
}
void DynamicFont::set_font_data(const Ref<DynamicFontData> &p_data) {
data = p_data;
data_at_size = data->_get_dynamic_font_at_size(size);
}
Ref<DynamicFontData> DynamicFont::get_font_data() const {
return data;
}
void DynamicFont::set_size(int p_size) {
if (size == p_size)
return;
size = p_size;
ERR_FAIL_COND(p_size < 1);
if (!data.is_valid())
return;
data_at_size = data->_get_dynamic_font_at_size(size);
}
int DynamicFont::get_size() const {
return size;
}
float DynamicFont::get_height() const {
if (!data_at_size.is_valid())
return 1;
return data_at_size->get_height();
}
float DynamicFont::get_ascent() const {
if (!data_at_size.is_valid())
return 1;
return data_at_size->get_ascent();
}
float DynamicFont::get_descent() const {
if (!data_at_size.is_valid())
return 1;
return data_at_size->get_descent();
}
Size2 DynamicFont::get_char_size(CharType p_char, CharType p_next) const {
if (!data_at_size.is_valid())
return Size2(1, 1);
return data_at_size->get_char_size(p_char, p_next);
}
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);
}
DynamicFont::DynamicFont() {
size = 16;
}
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;
FileAccess *f = FileAccess::open(p_path, FileAccess::READ);
ERR_FAIL_COND_V(!f, RES());
PoolVector<uint8_t> data;
data.resize(f->get_len());
ERR_FAIL_COND_V(data.size() == 0, RES());
{
PoolVector<uint8_t>::Write w = data.write();
f->get_buffer(w.ptr(), data.size());
}
Ref<DynamicFontData> dfd;
dfd.instance();
dfd->set_font_data(data);
if (r_error)
*r_error = OK;
return dfd;
}
void ResourceFormatLoaderDynamicFont::get_recognized_extensions(List<String> *p_extensions) const {
p_extensions->push_back("ttf");
}
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")
return "DynamicFontData";
return "";
}
#endif