+init

1 files changed, 149 insertions, 0 deletions

diff --git a/Client/Source/GUI/Font.h b/Client/Source/GUI/Font.h
new file mode 100644
index 0000000..6fd3c19
--- /dev/null
+++ b/Client/Source/GUI/Font.h
@@ -0,0 +1,149 @@
+#pragma once 
+
+#include "../Utilities/Singleton.h"
+#include "../Graphics/Texture.h"
+#include "../Common/DataBuffer.h"
+#include "../Math/Math.h"
+
+#include "freetype.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
+	Vector2f 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
+
+#pragma pack(1)
+	union Hash {
+		unsigned int hashCode;
+		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
+
+	Vector2f cursor; // 游标，从左上角（0,0）开始
+	int rowHeight;  // 当前行的高度
+};
+
+struct TextGeneratingSettings
+{
+	Vector2f 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:
+    Font(std::string path, TextGeneratingSettings setting)/*throw FontException*/;
+    Font(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(Vector2f, AtlasSize, m_AtlasSize);
+
+private:
+	Texture* CreateAtlas();
+	GlyphAtals* RequestAtlas(int pixelSize, Vector2f preferSize);
+	Rect GetRenderChartAndMove(GlyphAtals* atlas, Vector2f preferSize);
+	bool HasEnoughSpace(GlyphAtals* atlas, Vector2f preferSize);
+	character::Hash GetHash(character::Unicode Unicode, int pixelSize);
+
+    //-------------------------------------------------------------------------
+
+	std::unordered_map<unsigned int , 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;
+
+	Vector2f m_AtlasSize;
+    int     m_AtlasMargin;
+    int     m_GlyphPadding;
+
+	FT_Library m_FTLibrary;
+	FT_Face    m_FTFace;
+
+};
+
+namespace TextHelper
+{
+
+	void print_glyph(unsigned char* glyph, int width, int height);
+
+}