godot/scene/resources/dynamic_font_stb.cpp
2016-05-31 21:23:51 +08:00

528 lines
10 KiB
C++

#include "dynamic_font_stb.h"
#ifndef FREETYPE_ENABLED
#define STB_TRUETYPE_IMPLEMENTATION
#include "stb_truetype.h"
#include "os/file_access.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 = DVector<uint8_t>::Read();
}
void DynamicFontData::set_font_data(const DVector<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, const CharType& p_char,const 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
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]=cpbitmap[i*w+j]; //alpha as 0
}
}
}
//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_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() {
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);
ADD_PROPERTY(PropertyInfo(Variant::INT,"font/size"),_SCS("set_size"),_SCS("get_size"));
ADD_PROPERTY(PropertyInfo(Variant::OBJECT,"font/font",PROPERTY_HINT_RESOURCE_TYPE,"DynamicFontData"),_SCS("set_font_data"),_SCS("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, const CharType& p_char,const 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());
DVector<uint8_t> data;
data.resize(f->get_len());
ERR_FAIL_COND_V(data.size()==0,RES());
{
DVector<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