gdipp_server/freetype.cpp

   1 #include "stdafx.h"
   2 #include "freetype.h"
   3 #include "gdipp_config/constant_server.h"
   4 #include "gdipp_server/global.h"
   5 #include "gdipp_server/helper.h"
   6
   7 namespace gdipp
   8 {
   9
  10 FT_Library ft_lib;
  11 FTC_Manager ft_cache_man;
  12 FTC_ImageCache ft_glyph_cache;
  13 FT_Glyph empty_outline_glyph;
  14
  15 void initialize_freetype()
  16 {
  17         FT_Error ft_error;
  18
  19         ft_error = FT_Init_FreeType(&ft_lib);
  20         assert(ft_error == 0);
  21
  22         FT_LcdFilter lcd_filter = static_cast<FT_LcdFilter>(config_instance.get_number(L"/gdipp/server/freetype_lcd_filter/text()", static_cast<int>(server_config::LCD_FILTER)));
  23         ft_error = FT_Library_SetLcdFilter(ft_lib, lcd_filter);
  24         assert(ft_error == 0);
  25
  26         unsigned int b = server_cache_size >> 2;
  27         ft_error = FTC_Manager_New(ft_lib,
  28                 1 >> b,
  29                 1 >> (b + 1),
  30                 1 >> (b + 18),
  31                 face_requester,
  32                 NULL,
  33                 &ft_cache_man);
  34         assert(ft_error == 0);
  35
  36         ft_error = FTC_ImageCache_New(ft_cache_man, &ft_glyph_cache);
  37         assert(ft_error == 0);
  38
  39         empty_outline_glyph = make_empty_outline_glyph();
  40 }
  41
  42 void destroy_freetype()
  43 {
  44         FT_Error ft_error;
  45
  46         FTC_Manager_Done(ft_cache_man);
  47
  48         ft_error = FT_Done_FreeType(ft_lib);
  49         assert(ft_error == 0);
  50 }
  51
  52 FT_Error face_requester(FTC_FaceID face_id, FT_Library library, FT_Pointer request_data, FT_Face *aface)
  53 {
  54         FT_Open_Args args = {};
  55         args.flags = FT_OPEN_STREAM;
  56         args.stream = font_mgr_instance.lookup_stream(face_id);
  57
  58         return FT_Open_Face(library, &args, font_mgr_instance.lookup_face_index(face_id), aface);
  59 }
  60
  61 int get_freetype_kern(const FTC_Scaler scaler, WORD left_glyph, WORD right_glyph)
  62 {
  63         FT_Error ft_error;
  64
  65         FT_Size size;
  66         ft_error = FTC_Manager_LookupSize(ft_cache_man, scaler, &size);
  67         assert(ft_error == 0);
  68
  69         FT_Vector delta;
  70         ft_error = FT_Get_Kerning(size->face, left_glyph, right_glyph, FT_KERNING_DEFAULT, &delta);
  71         assert(ft_error == 0);
  72
  73         return int_from_26dot6(delta.x);
  74 }
  75
  76 FT_Glyph make_empty_outline_glyph()
  77 {
  78         FT_Glyph empty_glyph;
  79
  80         FT_Error ft_error;
  81
  82         FT_GlyphSlotRec glyph_slot = {};
  83         glyph_slot.library = ft_lib;
  84         glyph_slot.format = FT_GLYPH_FORMAT_OUTLINE;
  85
  86         ft_error = FT_Get_Glyph(&glyph_slot, &empty_glyph);
  87         if (ft_error != 0)
  88                 return NULL;
  89
  90         return empty_glyph;
  91 }
  92
  93 }