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Scalable fonts using freetype-gl

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This commit is contained in:
Dan Paulat 2021-08-06 22:16:34 -05:00
parent ec8e2643ff
commit 289ed430c7
8 changed files with 400 additions and 181 deletions
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27
scwx-qt/source/scwx/qt/util/font.hpp
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@ -5,6 +5,7 @@
#include <memory>
#include <string>
#include <boost/gil.hpp>
#include <glm/glm.hpp>
namespace scwx
@ -14,13 +15,7 @@ namespace qt
namespace util
{
struct Glyph
{
GLuint textureId;
glm::ivec2 size; // pixels
glm::ivec2 bearing; // pixels
GLint advance; // 1/64 pixels
};
class FontBuffer;
class FontImpl;
@ -36,12 +31,24 @@ public:
Font(Font&&) = delete;
Font& operator=(Font&&) = delete;
void GenerateGlyphs(OpenGLFunctions& gl,
std::unordered_map<char, Glyph>& glyphs,
unsigned int height);
float BufferText(std::shared_ptr<FontBuffer> buffer,
const std::string& text,
float x,
float y,
float scale,
boost::gil::rgba8_pixel_t color) const;
float Kerning(char c1, char c2) const;
float TextLength(const std::string& text, float scale) const;
GLuint GenerateTexture(OpenGLFunctions& gl);
static std::shared_ptr<Font> Create(const std::string& resource);
static std::shared_ptr<FontBuffer> CreateBuffer();
static void ClearBuffer(std::shared_ptr<FontBuffer> buffer);
static void RenderBuffer(OpenGLFunctions& gl,
std::shared_ptr<FontBuffer> buffer);
private:
std::unique_ptr<FontImpl> p;
};