how to calculate the extract font size?

[jank...@sina.com]

 I have using the following method to change the pdf object render  information

firstly, I initalized a rect with FX_RECT rect(0,0,913,1292),
and using the method  GetDisplayMatrix(rect, 0)  of CPDF_Page to chang the page size;

then using the following code to get the font size,
 float fontsize = textObject->m_TextState.GetFontSize();  

here, the textObject was the pointer of CPDF_TextObject,

while the font size I got seems was not suitable for text render.

[Lei Zhang]

What does "not suitable" mean exactly? Taking a wild guess, is the
font size being reported as 1 when you are expecting something more
like 12, based on what you see in the PDF rendering?

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[jank...@sina.com]

according the matrix to calculate the font size for display the text, I found the pdf.js can calculate the font size  with textRise and the font Hscale.