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linux应用程序_1_文本浏览器_3_fonts_2_各种字库_include fonts

作者：程序安全守护者 | 2024-01-30 19:27:12

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include fonts

linux应用程序_1_文本浏览器_3_fonts_2_各种字库

 

 

1、在初始化时，被选中编码节点会遍历它支持的字库，调用这些字库的初始化函数，若该字库不能使用（可能是没有字库文件、字体大小设置错误等），则将其移出链表

2、在获取字符位图时，需要调用字库的相应函数

 

以ascii_font.c为例：

设置字库结构体

  1. static T_FontOpr g_ptAsciiFontOpr = {
  2.     .pcName    = "ascii",
  3.     .FontInit  = AsciiFontInit,
  4.     .GetBitMap = AsciiGetBitMap,
  5. };

 

初始化：

ascii的字库是一个数组，初始化比较简单，只需要判断字体大小；其他的字库可能需要判断文件是否存在等

  1. static int AsciiFontInit(char *pcFontFile, int iFontSize)
  2. {
  3. 	if(iFontSize != 16)
  4. 	{
  5. 		DBG_PRINT("Error at AsciiFontInit : iFontSize != 16\r\n");
  6. 		return -1;
  7. 	}
  8.  
  9. 	return 0;
  10. }

 

获取字符位图

  1. static int AsciiGetBitMap(int iCode, PT_BitMap ptBitMap)
  2. {
  3. 	if(iCode >= 0x80)
  4. 	{
  5. 		DBG_PRINT("Error at AsciiGetBitMap : iCode >= 0x80\r\n");
  6. 		return -1;
  7. 	}
  8. 	ptBitMap->iXLeft 	   = ptBitMap->iCurOriginX;
  9. 	ptBitMap->iYTop  	   = ptBitMap->iCurOriginY - 16;
  10. 	ptBitMap->iNextOriginX = ptBitMap->iCurOriginX + 8;
  11. 	ptBitMap->iNextOriginY = ptBitMap->iCurOriginY;
  12. 	ptBitMap->iXMax 	   = ptBitMap->iCurOriginX + 8;
  13. 	ptBitMap->iYMax        = ptBitMap->iCurOriginY;
  14. 	ptBitMap->iBpp     	   = 1;
  15. 	ptBitMap->iPitch 	   = 1;
  16. 	ptBitMap->pucBuf 	   = (unsigned char *)&g_pucAsciiFontData_8x16[iCode*16];
  17.  
  18. 	return 0;
  19. }

 

初始化注册函数：

  1. int AsciiInit(void)
  2. {
  3. 	return RegisterFont(&g_ptAsciiFontOpr);
  4. }

 

 

（三种字库的）完整代码：

ascii_font.c

由于ascii的数组太长，这里不将其列出，可以百度下载ascii字库，拷贝到该文件或者使用外部引用

  1. #include <config.h>
  2. #include <fonts_manager.h>
  3. #include <string.h>
  4. #include <stdio.h>
  5.  
  6. static int AsciiFontInit(char *pcFontFile, int iFontSize);
  7. static int AsciiGetBitMap(int iCode, PT_BitMap ptBitMap);
  8.  
  9.  
  10. const unsigned char g_pucAsciiFontData_8x16[4096] = { /*********
  11.                                                        *********
  12.                                                        *********
  13.                                                         省略
  14.                                                        *********
  15.                                                        *********
  16.                                                        *********/};
  17.  
  18.  
  19. static T_FontOpr g_ptAsciiFontOpr = {
  20. 	.pcName    = "ascii",
  21. 	.FontInit  = AsciiFontInit,
  22. 	.GetBitMap = AsciiGetBitMap,
  23. };
  24.  
  25.  
  26. static int AsciiFontInit(char *pcFontFile, int iFontSize)
  27. {
  28. 	if(iFontSize != 16)
  29. 	{
  30. 		DBG_PRINT("Error at AsciiFontInit : iFontSize != 16\r\n");
  31. 		return -1;
  32. 	}
  33.  
  34. 	return 0;
  35. }
  36.  
  37. static int AsciiGetBitMap(int iCode, PT_BitMap ptBitMap)
  38. {
  39. 	if(iCode >= 0x80)
  40. 	{
  41. 		DBG_PRINT("Error at AsciiGetBitMap : iCode >= 0x80\r\n");
  42. 		return -1;
  43. 	}
  44. 	ptBitMap->iXLeft 	   = ptBitMap->iCurOriginX;
  45. 	ptBitMap->iYTop  	   = ptBitMap->iCurOriginY - 16;
  46. 	ptBitMap->iNextOriginX = ptBitMap->iCurOriginX + 8;
  47. 	ptBitMap->iNextOriginY = ptBitMap->iCurOriginY;
  48. 	ptBitMap->iXMax 	   = ptBitMap->iCurOriginX + 8;
  49. 	ptBitMap->iYMax        = ptBitMap->iCurOriginY;
  50. 	ptBitMap->iBpp     	   = 1;
  51. 	ptBitMap->iPitch 	   = 1;
  52. 	ptBitMap->pucBuf 	   = (unsigned char *)&g_pucAsciiFontData_8x16[iCode*16];
  53.  
  54. 	return 0;
  55. }
  56.  
  57. int AsciiInit(void)
  58. {
  59. 	return RegisterFont(&g_ptAsciiFontOpr);
  60. }
  61.

 

gbk_font.c

  1. #include <config.h>
  2. #include <fonts_manager.h>
  3. #include <string.h>
  4. #include <stdio.h>
  5.  
  6. #include <sys/types.h>
  7. #include <sys/stat.h>
  8. #include <fcntl.h>
  9.  
  10. #include <sys/mman.h>
  11.  
  12.  
  13. static int GbkFontInit(char *pcFontFile, int iFontSize);
  14. static int GbkGetBitMap(int iCode,  PT_BitMap ptBitMap);
  15.  
  16.  
  17. static T_FontOpr g_ptGbkFontOpr = {
  18. 	.pcName    = "gbk",
  19. 	.FontInit  = GbkFontInit,
  20. 	.GetBitMap = GbkGetBitMap,
  21. };
  22.  
  23. static int g_iHzkFd;
  24. static unsigned char *g_pucHzkMemStart;
  25. static unsigned char *g_pucHzkMemEnd;
  26.  
  27.  
  28. static int GbkFontInit(char *pcFontFile, int iFontSize)
  29. {
  30. 	struct stat ptHzkStat;
  31.  
  32. 	if(iFontSize != 16)
  33. 	{
  34. 		DBG_PRINT("Error at GbkFontInit : iFontSize != 16\r\n");
  35. 		return -1;
  36. 	}
  37.  
  38. 	g_iHzkFd = open(pcFontFile, O_RDONLY);
  39. 	if(g_iHzkFd < 0)
  40. 	{
  41. 		DBG_PRINT("Error at GbkFontInit : g_iHzkFd < 0\r\n");
  42. 		return -2;
  43. 	}
  44.  
  45. 	fstat(g_iHzkFd, &ptHzkStat);
  46. 	g_pucHzkMemStart = mmap(NULL, ptHzkStat.st_size, PROT_READ, MAP_SHARED, g_iHzkFd, 0);
  47. 	if(g_pucHzkMemStart  < 0)
  48. 	{
  49. 		DBG_PRINT("Error at GbkFontInit : g_pucHzkMemStart < 0\r\n");
  50. 		return -3;
  51. 	}
  52. 	g_pucHzkMemEnd = g_pucHzkMemStart + ptHzkStat.st_size;
  53.  
  54. 	return 0;
  55. }
  56.  
  57. static int GbkGetBitMap(int iCode,PT_BitMap ptBitMap)
  58. {
  59. 	int iArea;
  60. 	int iLocate;
  61.  
  62. 	if(iCode & 0xffff0000)	//larger than two bytes
  63. 	{
  64. 		DBG_PRINT("Error at GbkGetBitMap : iCode & 0xffff0000\r\n");
  65. 		return -1;
  66. 	}
  67.  
  68. 	iArea   = (int)(iCode & 0xff) - 0xa1;
  69. 	iLocate = (int)((iCode >> 8) & 0xff) - 0xa1 ;
  70.  
  71. 	if((iArea < 0) || (iLocate < 0))
  72. 	{
  73. 		DBG_PRINT("Error at GbkGetBitMap : iArea < 0 || iLocate < 0\r\n");
  74. 		return -2;
  75. 	}
  76.  
  77.  
  78. 	
  79. 	ptBitMap->iXLeft 	   = ptBitMap->iCurOriginX;
  80. 	ptBitMap->iYTop 	   = ptBitMap->iCurOriginY - 16;
  81. 	ptBitMap->iXMax 	   = ptBitMap->iCurOriginX + 16;
  82. 	ptBitMap->iYMax        = ptBitMap->iCurOriginY;
  83. 	ptBitMap->iBpp     	   = 1;
  84. 	ptBitMap->iPitch 	   = 2;
  85. 	ptBitMap->pucBuf 	   = g_pucHzkMemStart + (94 * iArea + iLocate) * 32;
  86.  
  87. 	if(ptBitMap->pucBuf > g_pucHzkMemEnd)
  88. 	{
  89. 		DBG_PRINT("Error at GbkGetBitMap : ptBitMap->pucBuf > g_pucHzkMemEnd\r\n");
  90. 		return -3;
  91. 	}
  92.  
  93. 	ptBitMap->iNextOriginY = ptBitMap->iCurOriginY;
  94. 	ptBitMap->iNextOriginX = ptBitMap->iCurOriginX + 16;
  95.  
  96.  
  97. 	return 0;
  98. }
  99.  
  100. int GbkInit(void)
  101. {
  102. 	return RegisterFont(&g_ptGbkFontOpr);
  103. }
  104.

 

freetype.c

  1. #include <config.h>
  2. #include <fonts_manager.h>
  3.  
  4.  
  5. #include <ft2build.h>
  6. #include FT_FREETYPE_H
  7. #include FT_GLYPH_H
  8.  
  9.  
  10.  
  11. static int FreetypeFontInit(char *pcFontFile, int iFontSize);
  12. static int FreetypeGetBitMap(int iCode, PT_BitMap ptBitMap);
  13.  
  14. static FT_Library   g_tLibrary;
  15. static FT_Face 	    g_tFace;
  16. static FT_GlyphSlot g_tSlot;
  17.  
  18.  
  19.  
  20. static T_FontOpr g_tFreetypeOpr = {
  21. 	.pcName    = "freetype",
  22. 	.FontInit  = FreetypeFontInit,
  23. 	.GetBitMap = FreetypeGetBitMap,
  24. };
  25. 	
  26. static int FreetypeFontInit(char *pcFontFile, int iFontSize)
  27. {
  28. 	int iError;
  29.  
  30. 	iError = FT_Init_FreeType(&g_tLibrary);
  31. 	if(iError)
  32. 	{
  33. 		DBG_PRINT("freetype library init fail\r\n");
  34. 		return -1;
  35. 	}
  36. 	iError = FT_New_Face(g_tLibrary, pcFontFile, 0, &g_tFace);
  37. 	if(iError)
  38. 	{
  39. 		DBG_PRINT("freetype get face fail\r\n");
  40. 		return -1;
  41. 	}
  42. 	iError = FT_Set_Pixel_Sizes(g_tFace,iFontSize,0);
  43. 	if(iError)
  44. 	{
  45. 		DBG_PRINT("freetype set font size fail\r\n");
  46. 		return -1;
  47. 	}
  48. 	
  49. 	g_tSlot = g_tFace->glyph;
  50. 	
  51. 	return 0;
  52. }
  53.  
  54. static int FreetypeGetBitMap(int iCode, PT_BitMap ptBitMap)
  55. {
  56. 	int iError;
  57. 	
  58.     iError = FT_Load_Char(g_tFace,(unsigned int) iCode, FT_LOAD_RENDER | FT_LOAD_MONOCHROME);
  59. 	if(iError)
  60. 	{
  61. 		DBG_PRINT("freetype load unsigned char fail\r\n");
  62. 		return -1;
  63. 	}
  64.  
  65. 	ptBitMap->iXLeft 	   = ptBitMap->iCurOriginX + g_tSlot->bitmap_left;
  66. 	ptBitMap->iYTop 	   = ptBitMap->iCurOriginY - g_tSlot->bitmap_top;
  67. 	ptBitMap->iXMax 	   = ptBitMap->iXLeft + g_tSlot->bitmap.width;
  68. 	ptBitMap->iYMax		   = ptBitMap->iYTop + g_tSlot->bitmap.rows;
  69. 	ptBitMap->iBpp 		   = 1;
  70. 	ptBitMap->iPitch       = g_tSlot->bitmap.pitch;
  71. 	ptBitMap->iNextOriginX = ptBitMap->iCurOriginX + g_tSlot->advance.x / 64;
  72. 	ptBitMap->iNextOriginY = ptBitMap->iCurOriginY;
  73. 	ptBitMap->pucBuf        = (unsigned char *)g_tSlot->bitmap.buffer;	
  74.  
  75. 	
  76.  
  77. 	return 0;	
  78. }
  79.  
  80. int FreetypeInit(void)
  81. {
  82. 	return RegisterFont(&g_tFreetypeOpr);
  83. }
  84.  
  85.

 

 

 

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