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text-buffer.h
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text-buffer.h
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/* Freetype GL - A C OpenGL Freetype engine
*
* Distributed under the OSI-approved BSD 2-Clause License. See accompanying
* file `LICENSE` for more details.
*/
#ifndef __TEXT_BUFFER_H__
#define __TEXT_BUFFER_H__
#ifdef __cplusplus
extern "C" {
#endif
#include "vertex-buffer.h"
#include "markup.h"
#ifdef __cplusplus
namespace ftgl {
#endif
/**
* Use LCD filtering
*/
#define LCD_FILTERING_ON 3
/**
* Do not use LCD filtering
*/
#define LCD_FILTERING_OFF 1
/**
* @file text-buffer.h
* @author Nicolas Rougier ([email protected])
*
* @defgroup text-buffer Text buffer
*
*
* <b>Example Usage</b>:
* @code
*
* int main( int arrgc, char *argv[] )
* {
*
* return 0;
* }
* @endcode
*
* @{
*/
/**
* Text buffer structure
*/
typedef struct text_buffer_t {
/**
* Vertex buffer
*/
vertex_buffer_t *buffer;
/**
* Base color for text
*/
vec4 base_color;
/**
* Pen origin
*/
vec2 origin;
/**
* Last pen y location
*/
float last_pen_y;
/**
* Total bounds
*/
vec4 bounds;
/**
* Index (in the vertex buffer) of the current line start
*/
size_t line_start;
/**
* Location of the start of the line
*/
float line_left;
/**
* Vector of line information
*/
vector_t * lines;
/**
* Current line ascender
*/
float line_ascender;
/**
* Current line decender
*/
float line_descender;
} text_buffer_t;
/**
* Glyph vertex structure
*/
typedef struct glyph_vertex_t {
/**
* Vertex x coordinates
*/
float x;
/**
* Vertex y coordinates
*/
float y;
/**
* Vertex z coordinates
*/
float z;
/**
* Texture first coordinate
*/
float u;
/**
* Texture second coordinate
*/
float v;
/**
* Color red component
*/
float r;
/**
* Color green component
*/
float g;
/**
* Color blue component
*/
float b;
/**
* Color alpha component
*/
float a;
/**
* Shift along x
*/
float shift;
/**
* Color gamma correction
*/
float gamma;
} glyph_vertex_t;
/**
* Line structure
*/
typedef struct line_info_t {
/**
* Index (in the vertex buffer) where this line starts
*/
size_t line_start;
/**
* bounds of this line
*/
vec4 bounds;
} line_info_t;
/**
* Align enumeration
*/
typedef enum Align
{
/**
* Align text to the left hand side
*/
ALIGN_LEFT,
/**
* Align text to the center
*/
ALIGN_CENTER,
/**
* Align text to the right hand side
*/
ALIGN_RIGHT
} Align;
/**
* Creates a new empty text buffer.
*
* @return a new empty text buffer.
*
*/
text_buffer_t *
text_buffer_new( void );
/**
* Deletes texture buffer and its associated vertex buffer.
*
* @param self texture buffer to delete
*
*/
void
text_buffer_delete( text_buffer_t * self );
/**
* Print some text to the text buffer
*
* @param self a text buffer
* @param pen position of text start
* @param ... a series of markup_t *, char * ended by NULL
*
*/
void
text_buffer_printf( text_buffer_t * self, vec2 * pen, ... );
/**
* Add some text to the text buffer
*
* @param self a text buffer
* @param pen position of text start
* @param markup Markup to be used to add text
* @param text Text to be added
* @param length Length of text to be added
*/
void
text_buffer_add_text( text_buffer_t * self,
vec2 * pen, markup_t * markup,
const char * text, size_t length );
/**
* Add a char to the text buffer
*
* @param self a text buffer
* @param pen position of text start
* @param markup markup to be used to add text
* @param current charactr to be added
* @param previous previous character (if any)
*/
void
text_buffer_add_char( text_buffer_t * self,
vec2 * pen, markup_t * markup,
const char * current, const char * previous );
/**
* Align all the lines of text already added to the buffer
* This alignment will be relative to the overall bounds of the
* text which can be queried by text_buffer_get_bounds
*
* @param self a text buffer
* @param pen pen used in last call (must be unmodified)
* @param alignment desired alignment of text
*/
void
text_buffer_align( text_buffer_t * self, vec2 * pen,
enum Align alignment );
/**
* Get the rectangle surrounding the text
*
* @param self a text buffer
* @param pen pen used in last call (must be unmodified)
*/
vec4
text_buffer_get_bounds( text_buffer_t * self, vec2 * pen );
/**
* Clear text buffer
*
* @param self a text buffer
*/
void
text_buffer_clear( text_buffer_t * self );
/** @} */
#ifdef __cplusplus
}
}
#endif
#endif /* #define __TEXT_BUFFER_H__ */