guiencjs.c

来自「uCGUI」· C语言 代码 · 共 100 行

/*************************************************************************************************************
                                                   uC/GUI
                                               嵌入式通用图形软件
File        : GUIEncSJ.C
Purpose     : Implementation of Shift JIS decoding
************************************************************************************************************/
#include <stddef.h>           /* needed for definition of NULL */
#include "GUI_Protected.H"


/*************************************************************************************************************
                       Static subroutines
*************************************************************************************************************/
static U16 DB2SJIS(U8 Byte0, U8 Byte1) 
{
  return Byte1 | (((U16)Byte0)<<8);
}

/*************** GUI_GetStringDistX ****************************
This routine is used to calculate the length of a string in pixels.
************************************************************************************************************/
int GUI_GetLineDistX_SJIS(const char GUI_FAR *s, int Len) 
{
  int Dist =0;
  if (s) {
    U8 c0;
    while (((c0=*(U8*)s) !=0) && Len >=0) 
    {
      s++; Len--;
      if (c0 > 127) {
        U8  c1 = *(U8*)s++;
        Len--;
        Dist += GUI_GetCharDistX(DB2SJIS(c0, c1));
      } else {
        Dist += GUI_GetCharDistX(c0);
      }
    }
  }
  return Dist;
}

/*************** GUI_GetLineLen ****************************
Returns the number of characters in a string
Note: tthe return value can be used as offset into the
string, which means that double characters count double
************************************************************************************************************/
int GUI_GetLineLen_SJIS(const char GUI_FAR *s, int MaxLen) 
{
  int Len =0;
  U8 c0;
  while (((c0=*(U8*)s) !=0) && Len < MaxLen) 
  {
    s++;
    if (c0 > 127) 
    	{
      Len++; s++;
    } 
    else 
    {
      switch (c0) 
      {
      case '\n': return Len;
      }
    }
    Len++;
  }
  return Len;
}

/*************************************************************************************************************
                Display line
*************************************************************************************************************/
void GL_DispLine_SJIS(const char GUI_FAR *s, int Len) 
{
  U8 c0;
  while (--Len >=0) 
  {
    c0=*(U8*)s++;
    if (c0 > 127) 
    {
      U8  c1 = *(U8*)s++;
      Len--;
      GL_DispChar (DB2SJIS(c0, c1));
    } 
    else 
    {
      GL_DispChar(c0);
    }
  }
}


tGUI_ENC_APIList GUI_ENC_APIList_SJIS = 
{
  GUI_GetLineDistX_SJIS,
  GUI_GetLineLen_SJIS,
  GL_DispLine_SJIS
};