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308 lines
9.6 KiB
308 lines
9.6 KiB
15 years ago
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/****************************************************************************/
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/* */
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/* The FreeType project -- a free and portable quality TrueType renderer. */
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/* */
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/* Copyright 2005, 2006 by */
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/* D. Turner, R.Wilhelm, and W. Lemberg */
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/* */
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/* */
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/* ftcommon.h - common routines for the FreeType demo programs. */
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/* */
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/****************************************************************************/
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#ifndef _FT_COMMON_H_
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#define _FT_COMMON_H_
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include FT_CACHE_H
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#include FT_CACHE_MANAGER_H
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#include FT_GLYPH_H
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#include FT_BITMAP_H
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#include <stdlib.h>
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#include <stdarg.h>
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extern FT_Error error;
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/* forward declarations */
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extern void PanicZ( const char* message );
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#undef NODEBUG
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#define LOG( x ) /* */
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** DISPLAY-SPECIFIC DEFINITIONS *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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#include "graph.h"
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#include "grobjs.h"
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#include "grfont.h"
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typedef struct
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{
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grSurface* surface;
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grBitmap* bitmap;
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grColor fore_color;
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grColor back_color;
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} FTDemo_Display;
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grBitmap*
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FTDemo_Display_New(void);
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void
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FTDemo_Display_Done(grBitmap *);
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/* fill the bitmap with background color */
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void
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FTDemo_Display_Clear(grBitmap *);
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** FREETYPE-SPECIFIC DEFINITIONS *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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#define MAX_GLYPHS 512 /* at most 512 glyphs in the string */
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#define MAX_GLYPH_BYTES 150000 /* 150kB for the glyph image cache */
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typedef struct TGlyph_
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{
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FT_UInt glyph_index;
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FT_Glyph image; /* the glyph image */
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FT_Pos delta; /* delta caused by hinting */
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FT_Vector vvector; /* vert. origin => hori. origin */
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FT_Vector vadvance; /* vertical advance */
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} TGlyph, *PGlyph;
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/* this simple record is used to model a given `installed' face */
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typedef struct TFont_
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{
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const char* filepathname;
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int face_index;
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int cmap_index;
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int num_indices;
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void* file_address; /* for preloaded files */
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size_t file_size;
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} TFont, *PFont;
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enum {
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LCD_MODE_AA = 0,
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LCD_MODE_LIGHT,
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LCD_MODE_RGB,
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LCD_MODE_BGR,
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LCD_MODE_VRGB,
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LCD_MODE_VBGR,
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N_LCD_MODES
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};
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enum {
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KERNING_DEGREE_NONE = 0,
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KERNING_DEGREE_LIGHT,
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KERNING_DEGREE_MEDIUM,
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KERNING_DEGREE_TIGHT,
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N_KERNING_DEGREES,
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};
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enum {
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KERNING_MODE_NONE = 0, /* 0: no kerning; */
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KERNING_MODE_NORMAL, /* 1: `kern' values */
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KERNING_MODE_SMART, /* 2: `kern' + side bearing errors */
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N_KERNING_MODES
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};
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typedef struct
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{
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int kerning_mode;
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int kerning_degree;
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FT_Fixed center; /* 0..1 */
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int vertical; /* displayed vertically? */
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FT_Matrix* matrix; /* string transformation */
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FT_Byte* gamma_ramp; /* an array of size 256 */
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} FTDemo_String_Context;
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typedef struct
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{
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FT_Library library; /* the FreeType library */
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FTC_Manager cache_manager; /* the cache manager */
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FTC_ImageCache image_cache; /* the glyph image cache */
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FTC_SBitCache sbits_cache; /* the glyph small bitmaps cache */
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FTC_CMapCache cmap_cache; /* the charmap cache.. */
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PFont* fonts; /* installed fonts */
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int num_fonts;
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int max_fonts;
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int use_sbits_cache; /* toggle sbits cache */
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/* use FTDemo_Set_Current_XXX to set the following two fields */
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PFont current_font; /* selected font */
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FTC_ImageTypeRec image_type;
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/* call FTDemo_Update_Current_Flags after setting any of the following fields */
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int hinted; /* is glyph hinting active? */
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int antialias; /* is anti-aliasing active? */
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int use_sbits; /* do we use embedded bitmaps? */
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int low_prec; /* force low precision */
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int autohint; /* force auto-hinting */
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int lcd_mode;
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int preload; /* force font file preloading */
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/* don't touch the following fields! */
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/* used for string rendering */
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TGlyph string[MAX_GLYPHS];
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int string_length;
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int string_reload;
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FT_Encoding encoding;
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FT_Bitmap bitmap; /* used as bitmap conversion buffer */
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} FTDemo_Handle;
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FTDemo_Handle*
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FTDemo_New( FT_Encoding encoding );
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void
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FTDemo_Done( FTDemo_Handle* handle );
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/* install a font */
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FT_Error
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FTDemo_Install_Font( FTDemo_Handle* handle,
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const char* filepath );
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void
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FTDemo_Set_Preload( FTDemo_Handle* handle,
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int preload );
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void
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FTDemo_Set_Current_Font( FTDemo_Handle* handle,
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PFont font );
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void
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FTDemo_Set_Current_Size( FTDemo_Handle* handle,
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int pixel_size );
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void
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FTDemo_Set_Current_Pointsize( FTDemo_Handle* handle,
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int point_size,
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int res );
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void
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FTDemo_Update_Current_Flags( FTDemo_Handle* handle );
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/* charcode => glyph index of current font */
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FT_UInt
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FTDemo_Get_Index( FTDemo_Handle* handle,
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FT_UInt32 charcode );
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/* get FT_Size of current font */
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FT_Error
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FTDemo_Get_Size( FTDemo_Handle* handle,
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FT_Size* asize );
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/* convert a FT_Glyph to a grBitmap (don't free target->buffer) */
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/* if aglyf != NULL, you should FT_Glyph_Done the aglyf */
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FT_Error
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FTDemo_Glyph_To_Bitmap( FTDemo_Handle* handle,
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FT_Glyph glyf,
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grBitmap* target,
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int* left,
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int* top,
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int* x_advance,
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int* y_advance,
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FT_Glyph* aglyf );
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/* get a grBitmap from glyph index (don't free target->buffer) */
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/* if aglyf != NULL, you should FT_Glyph_Done the aglyf */
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FT_Error
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FTDemo_Index_To_Bitmap( FTDemo_Handle* handle,
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FT_ULong Index,
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grBitmap* target,
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int* left,
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int* top,
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int* x_advance,
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int* y_advance,
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FT_Glyph* aglyf );
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/* given glyph index, draw a glyph on the display */
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FT_Error
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FTDemo_Draw_Index( FTDemo_Handle* handle,
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grBitmap* display,
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int gindex,
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int* pen_x,
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int* pen_y);
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/* given FT_Glyph, draw a glyph on the display */
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FT_Error
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FTDemo_Draw_Glyph( FTDemo_Handle* handle,
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FTDemo_Display* display,
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FT_Glyph glyph,
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int* pen_x,
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int* pen_y);
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/* given FT_GlyphSlot, draw a glyph on the display */
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FT_Error
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FTDemo_Draw_Slot( FTDemo_Handle* handle,
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FTDemo_Display* display,
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FT_GlyphSlot slot,
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int* pen_x,
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int* pen_y);
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/* set the string to be drawn */
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void
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FTDemo_String_Set( FTDemo_Handle* handle,
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const unsigned char* string );
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/* draw a string centered at (center_x, center_y) -- */
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/* note that handle->use_sbits_cache is not supported */
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FT_Error
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FTDemo_String_Draw( FTDemo_Handle* handle,
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FTDemo_Display* display,
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FTDemo_String_Context* sc,
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int center_x,
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int center_y );
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/* make a FT_Encoding tag from a string */
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FT_Encoding
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FTDemo_Make_Encoding_Tag( const char* s );
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#endif /* _FTCOMMON_H_ */
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/* End */
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