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126 lines
3.5 KiB
C++
126 lines
3.5 KiB
C++
#ifndef _FONT_H_
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#define _FONT_H_
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#include <string>
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#include "../platform.h"
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#include GLHEADER
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include <Eigen/Dense>
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#include "ResourceManager.h"
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#include "../ThemeData.h"
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class TextCache;
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#define FONT_SIZE_SMALL ((unsigned int)(0.035f * Renderer::getScreenHeight()))
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#define FONT_SIZE_MEDIUM ((unsigned int)(0.045f * Renderer::getScreenHeight()))
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#define FONT_SIZE_LARGE ((unsigned int)(0.1f * Renderer::getScreenHeight()))
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//A TrueType Font renderer that uses FreeType and OpenGL.
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//The library is automatically initialized when it's needed.
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class Font : public IReloadable
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{
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public:
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static void initLibrary();
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static std::shared_ptr<Font> get(int size, const std::string& path = getDefaultPath());
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~Font();
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FT_Face face;
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//contains sizing information for every glyph.
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struct charPosData {
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int texX;
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int texY;
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int texW;
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int texH;
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float advX; //!<The horizontal distance to advance to the next character after this one
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float advY; //!<The vertical distance to advance to the next character after this one
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float bearingX; //!<The horizontal distance from the cursor to the start of the character
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float bearingY; //!<The vertical distance from the cursor to the start of the character
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};
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charPosData charData[128];
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GLuint textureID;
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TextCache* buildTextCache(const std::string& text, float offsetX, float offsetY, unsigned int color);
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void renderTextCache(TextCache* cache);
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//Create a TextCache, render with it, then delete it. Best used for short text or text that changes frequently.
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void drawText(std::string text, const Eigen::Vector2f& offset, unsigned int color);
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Eigen::Vector2f sizeText(std::string text) const; //Sets the width and height of a given string to supplied pointers. A dimension is skipped if its pointer is NULL.
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std::string wrapText(std::string text, float xLen) const;
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void drawWrappedText(std::string text, const Eigen::Vector2f& offset, float xLen, unsigned int color);
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Eigen::Vector2f sizeWrappedText(std::string text, float xLen) const;
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Eigen::Vector2f getWrappedTextCursorOffset(std::string text, float xLen, int cursor) const;
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void drawCenteredText(std::string text, float xOffset, float y, unsigned int color);
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int getHeight() const;
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void unload(std::shared_ptr<ResourceManager>& rm) override;
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void reload(std::shared_ptr<ResourceManager>& rm) override;
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int getSize() const;
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static std::string getDefaultPath();
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static std::shared_ptr<Font> getFromTheme(const ThemeData::ThemeElement* elem, unsigned int properties, const std::shared_ptr<Font>& orig);
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private:
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static int getDpiX();
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static int getDpiY();
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static FT_Library sLibrary;
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static bool libraryInitialized;
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static std::map< std::pair<std::string, int>, std::weak_ptr<Font> > sFontMap;
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Font(int size, const std::string& path);
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void init(ResourceData data);
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void deinit();
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void buildAtlas(ResourceData data); //Builds a "texture atlas," one big OpenGL texture with glyphs 32 to 128.
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int textureWidth; //OpenGL texture width
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int textureHeight; //OpenGL texture height
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int mMaxGlyphHeight;
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float fontScale; //!<Font scale factor. It is > 1.0 if the font would be to big for the texture
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int mSize;
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const std::string mPath;
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};
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class TextCache
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{
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public:
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struct Vertex
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{
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Eigen::Vector2f pos;
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Eigen::Vector2f tex;
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};
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struct CacheMetrics
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{
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Eigen::Vector2f size;
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} metrics;
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void setColor(unsigned int color);
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TextCache(int verts, Vertex* v, GLubyte* c, const CacheMetrics& m);
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~TextCache();
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int vertCount;
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Vertex* verts;
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GLubyte* colors;
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};
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#endif
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