請問cc.label要怎麼實現css的 (font-family: Arial, ‘新細明體’, sans-serif;)引用多個字型的效果
对于TTF字体，系统使用的freetype解析，只解析了第0个face，所以暂时不支持同一个字体多个字形。
代码实现：
相关知识，FreeType文档：https://www.freetype.org/freetype2/docs/tutorial/step1.html#section-4
Create a new face object by calling FT_New_Face. A face describes a given typeface and style. For example, ‘Times New Roman Regular’ and ‘Times New Roman Italic’ correspond to two different faces.
FT_Library library; /* handle to library */
FT_Face face; /* handle to face object */
error = FT_Init_FreeType( &library );
if ( error ) { ... }
error = FT_New_Face( library,
"/usr/share/fonts/truetype/arial.ttf",
0,
&face );
if ( error == FT_Err_Unknown_File_Format )
{
... the font file could be opened and read, but it appears
... that its font format is unsupported
}
else if ( error )
{
... another error code means that the font file could not
... be opened or read, or that it is broken...
}
As you can certainly imagine, FT_New_Face opens a font file, then tries to extract one face from it. Its parameters are as follows.
library
A handle to the FreeType library instance where the face object is created.
filepathname
The font file pathname (a standard C string).
face_index
Certain font formats allow several font faces to be embedded in a single file.
This index tells which face you want to load. An error is returned if its value is too large.
Index 0 always works, though.
face
A pointer to the handle that is set to describe the new face object.
It is set to NULL in case of error.
To know how many faces a given font file contains, set face_index to -1, then check the value of face->num_faces, which indicates how many faces are embedded in the font file