gdipp_server/os2_metrics.cpp

   1 #include "stdafx.h"
   2 #include "os2_metrics.h"
   3 #include "gdipp_lib/helper.h"
   4 #include "gdipp_rpc/gdipp_rpc.h"
   5 #include "gdipp_server/global.h"
   6
   7 namespace gdipp
   8 {
   9
  10 #define OS2_TABLE_TAG mmioFOURCC('O', 'S', '/', '2')
  11
  12 // little-endian <-> big-endian
  13 #define SWAPWORD(x) MAKEWORD(HIBYTE(x), LOBYTE(x))
  14 #define SWAPLONG(x) MAKELONG(SWAPWORD(HIWORD(x)), SWAPWORD(LOWORD(x)))
  15
  16 bool os2_metrics::init(HDC hdc)
  17 {
  18         // retrieve needed fields from the OS/2 table
  19
  20         DWORD font_data_size;
  21
  22         font_data_size = GetFontData(hdc, OS2_TABLE_TAG, offsetof(TT_OS2, xAvgCharWidth), &_xAvgCharWidth, sizeof(_xAvgCharWidth));
  23         if (font_data_size == GDI_ERROR)
  24                 return false;
  25
  26         font_data_size = GetFontData(hdc, OS2_TABLE_TAG, offsetof(TT_OS2, usWeightClass), &_usWeightClass, sizeof(_usWeightClass));
  27         if (font_data_size == GDI_ERROR)
  28                 return false;
  29
  30         font_data_size = GetFontData(hdc, OS2_TABLE_TAG, offsetof(TT_OS2, usWidthClass), &_usWidthClass, sizeof(_usWidthClass));
  31         if (font_data_size == GDI_ERROR)
  32                 return false;
  33
  34         font_data_size = GetFontData(hdc, OS2_TABLE_TAG, offsetof(TT_OS2, fsSelection), &_fsSelection, sizeof(_fsSelection));
  35         if (font_data_size == GDI_ERROR)
  36                 return false;
  37
  38         _xAvgCharWidth = SWAPWORD(_xAvgCharWidth);
  39         _usWeightClass = SWAPWORD(_usWeightClass);
  40         _usWidthClass = SWAPWORD(_usWidthClass);
  41         _fsSelection = SWAPWORD(_fsSelection);
  42
  43         return true;
  44 }
  45
  46 bool os2_metrics::init(void *font_id)
  47 {
  48         // retrieve needed fields from the OS/2 table
  49
  50         DWORD font_data_size;
  51
  52         HDC font_holder = dc_pool_instance.claim();
  53
  54         font_data_size = font_mgr_instance.lookup_font_data(font_id, OS2_TABLE_TAG, offsetof(TT_OS2, xAvgCharWidth), reinterpret_cast<byte *>(&_xAvgCharWidth), sizeof(_xAvgCharWidth), font_holder);
  55         if (font_data_size == GDI_ERROR)
  56                 goto failed_init_os2_metrics;
  57
  58         font_data_size = font_mgr_instance.lookup_font_data(font_id, OS2_TABLE_TAG, offsetof(TT_OS2, usWeightClass), reinterpret_cast<byte *>(&_usWeightClass), sizeof(_usWeightClass), font_holder);
  59         if (font_data_size == GDI_ERROR)
  60                 goto failed_init_os2_metrics;
  61
  62         font_data_size = font_mgr_instance.lookup_font_data(font_id, OS2_TABLE_TAG, offsetof(TT_OS2, usWidthClass), reinterpret_cast<byte *>(&_usWidthClass), sizeof(_usWidthClass), font_holder);
  63         if (font_data_size == GDI_ERROR)
  64                 goto failed_init_os2_metrics;
  65
  66         font_data_size = font_mgr_instance.lookup_font_data(font_id, OS2_TABLE_TAG, offsetof(TT_OS2, fsSelection), reinterpret_cast<byte *>(&_fsSelection), sizeof(_fsSelection), font_holder);
  67         if (font_data_size == GDI_ERROR)
  68                 goto failed_init_os2_metrics;
  69
  70         _xAvgCharWidth = SWAPWORD(_xAvgCharWidth);
  71         _usWeightClass = SWAPWORD(_usWeightClass);
  72         _usWidthClass = SWAPWORD(_usWidthClass);
  73         _fsSelection = SWAPWORD(_fsSelection);
  74
  75         return true;
  76
  77 failed_init_os2_metrics:
  78         dc_pool_instance.free(font_holder);
  79         return false;
  80 }
  81
  82 FT_Short os2_metrics::get_xAvgCharWidth() const
  83 {
  84         return _xAvgCharWidth;
  85 }
  86
  87 char os2_metrics::get_weight_class() const
  88 {
  89         return get_gdi_weight_class(_usWeightClass);
  90 }
  91
  92 FT_UShort os2_metrics::get_usWidthClass() const
  93 {
  94         return _usWidthClass;
  95 }
  96
  97 bool os2_metrics::is_italic() const
  98 {
  99         return (_fsSelection & 1);
 100 }
 101
 102 }