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#pragma once
#include "Runtime/Utilities/Singleton.h"
#include "Runtime/Graphics/Texture.h"
#include "freetype.h"
#include "Runtime/Lua/LuaHelper.h"
#include "Runtime/Common/DataBuffer.h"
#include "Runtime/Math/Math.h"
#include <string>
#include <unordered_map>
#include <exception>
#include <vector>
//https://github.com/kaienfr/Font
struct Character {
unsigned int atlas; // atlas索引
Rect position; // 在altas里的位置，以左上角为原点的，和GL的Y镜像
Vector2 bearing; // 左上角相对于原点的偏移
unsigned int advance; // 总宽，算上了间隔
};
namespace character
{
#if GAMELAB_WIN
typedef unsigned short Unicode; // unicode codepoint（BMP，U+0000至U+FFFF)
#else
typedef unsigned int Unicode; // unicode codepoint（BMP，U+0000至U+FFFF)
#endif
union Hash {
unsigned int hashCode;
#pragma pack(1)
struct {
Unicode codepoint;
unsigned short size;//字体大小
};
#pragma pack(pop)
bool operator==(const Hash &other) const
{
return codepoint == other.codepoint && size == other.size;
}
};
}
struct UnicodeString
{
character::Unicode* str;
int length;
};
namespace std
{
template <>
struct hash<character::Hash>
{
std::size_t operator()(const character::Hash& k) const
{
return k.hashCode;
}
};
}
struct GlyphAtals
{
int index;
Texture* altas; // 贴图
int width, height; // 尺寸
Vector2 cursor; // 游标，从左上角（0,0）开始
int rowHeight; // 当前行的高度
};
struct TextGeneratingSettings
{
Vector2 atlasSize; // atlas的尺寸
int margin; // atlas的边界
int padding; // glyph相互之间的间距，防止采样的时候越界
};
class FontException : public std::exception
{
public:
FontException(const char* what)
: std::exception(what)
{
}
};
enum EEncoding
{
Encoding_ASCII,
Encoding_UTF8,
Encoding_UTF16,
};
// 没有字形，但是有advance的文字，比如space和tab
#define FONT_NOT_IN_ATLAS_PLACEHOLDER (INT_MAX)
// 单个字体
class Font : public LuaBind::NativeClass<Font>
{
public:
Font(std::string path, TextGeneratingSettings setting)/*throw FontException*/;
Font(LuaBind::VM* vm, std::string path, TextGeneratingSettings setting)/*throw FontException*/;
Font(DataBuffer* db, TextGeneratingSettings setting)/*throw FontException*/;
Font(LuaBind::VM* vm, DataBuffer* db, TextGeneratingSettings setting)/*throw FontException*/;
const Character* GetCharacter(character::Unicode codepoint, int pixelSize);
const GlyphAtals* GetGlyphAtlas(int index);
// pre-bake
bool RenderCharacter(character::Unicode codepoint, int pixelSize);
void RenderCharacters(character::Unicode* codepoint, int n, int pixelSize);
void RenderCharacters(std::vector<character::Unicode>& codepoint, int pixelSize);
GET(Vector2, AtlasSize, m_AtlasSize);
private:
Texture* CreateAtlas();
GlyphAtals* RequestAtlas(int pixelSize, Vector2 preferSize);
Rect GetRenderChartAndMove(GlyphAtals* atlas, Vector2 preferSize);
bool HasEnoughSpace(GlyphAtals* atlas, Vector2 preferSize);
character::Hash GetHash(character::Unicode Unicode, int pixelSize);
//-------------------------------------------------------------------------
std::unordered_map<character::Hash, Character> m_Characters; // 渲染完的文字
std::vector<GlyphAtals> m_Atlases; // 当前所有的atlas，由font完全拥有所有权，所以是lightuserdata
std::unordered_map<int/*pixelSize*/, GlyphAtals*> m_AtlasCache; // 快速找到可用的atlas
bool m_IsEnabled;
Vector2 m_AtlasSize;
int m_AtlasMargin;
int m_GlyphPadding;
FT_Library m_FTLibrary;
FT_Face m_FTFace;
//-------------------------------------------------------------------------
LUA_BIND_DECL_CLASS(Font);
LUA_BIND_DECL_METHOD(_New);
LUA_BIND_DECL_METHOD(_GetCharacter);
LUA_BIND_DECL_METHOD(_GetCharacters);
LUA_BIND_DECL_METHOD(_GetGlyphAtlas);
};
namespace TextHelper
{
void print_glyph(unsigned char* glyph, int width, int height);
}
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