528 lines
10 KiB
C++
528 lines
10 KiB
C++
#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 "stb_truetype.h"
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#include "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 = DVector<uint8_t>::Read();
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}
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void DynamicFontData::set_font_data(const DVector<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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{
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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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////////////////////
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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, const CharType& p_char,const CharType& p_next,const Color& p_modulate) 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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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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//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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//print_line("char has no bitmap: "+itos(p_char)+" but advance is "+itos(advance*scale));
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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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// print_line("CHAR: "+String::chr(p_char)+" TEX INDEX: "+itos(tex_index)+" X: "+itos(tex_x)+" Y: "+itos(tex_y));
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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=nearest_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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DVector<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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DVector<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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Image img(tex.texture_size,tex.texture_size,0,Image::FORMAT_GRAYSCALE_ALPHA,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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//print_line("CHAR: "+String::chr(p_char)+" TEX INDEX: "+itos(tex_index)+" RECT: "+chr.rect+" X OFS: "+itos(xofs)+" Y OFS: "+itos(yofs));
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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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ObjectTypeDB::bind_method(_MD("set_font_data","data:DynamicFontData"),&DynamicFont::set_font_data);
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ObjectTypeDB::bind_method(_MD("get_font_data:DynamicFontData"),&DynamicFont::get_font_data);
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ObjectTypeDB::bind_method(_MD("set_size","data"),&DynamicFont::set_size);
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ObjectTypeDB::bind_method(_MD("get_size"),&DynamicFont::get_size);
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ADD_PROPERTY(PropertyInfo(Variant::INT,"font/size"),_SCS("set_size"),_SCS("get_size"));
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ADD_PROPERTY(PropertyInfo(Variant::OBJECT,"font/font",PROPERTY_HINT_RESOURCE_TYPE,"DynamicFontData"),_SCS("set_font_data"),_SCS("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, const CharType& p_char,const CharType& p_next,const Color& p_modulate) 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);
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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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DVector<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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DVector<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.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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