DenysMedvid/pdf2htmlEX
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This commit is contained in:
Lu Wang 2012-08-28 19:00:30 +08:00
parent 8325e826f8
commit cfc91c2a3f
1 changed files with 28 additions and 21 deletions
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49
src/HTMLRenderer/install.cc
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@ -99,27 +99,6 @@ FontInfo HTMLRenderer::install_font(GfxFont * font)
// add a new function and move to text.cc
void HTMLRenderer::install_embedded_font(GfxFont * font, const string & suffix, long long fn_id, bool & use_tounicode)
{
// TODO Should use standard way to handle CID fonts
/*
* How it works:
*
* 1.dump the font file directly from the font descriptor and put the glyphs into the correct slots
*
* for nonCID
* nothing need to do
*
* for CID + nonTrueType
* Flatten the font
*
* for CID Truetype
* Just use glyph order, and later we'll map GID (instead of char code) to Unicode
*
*
* 2. map charcode (or GID for CID truetype) to Unicode
*
* generate an encoding file and let fontforge handle it.
*/
string fn = (format("f%|1$x|") % fn_id).str();
path script_path = tmp_dir / (fn + ".pe");
@ -134,6 +113,22 @@ void HTMLRenderer::install_embedded_font(GfxFont * font, const string & suffix,
Gfx8BitFont * font_8bit = nullptr;
/*
* Step 1
* dump the font file directly from the font descriptor and put the glyphs into the correct slots
*
* for 8bit + nonTrueType
* re-encoding the font using a PostScript encoding list (glyph id <-> glpyh name)
*
* for 8bit + TrueType
* sort the glpyhs as the original order, and later will map GID (instead of char code) to Unicode
*
* for CID + nonTrueType
* Flatten the font
*
* for CID Truetype
* same as 8bitTrueType, except for that we have to check 65536 charcodes
*/
if(!font->isCIDFont())
{
font_8bit = dynamic_cast<Gfx8BitFont*>(font);
@ -193,6 +188,18 @@ void HTMLRenderer::install_embedded_font(GfxFont * font, const string & suffix,
}
}
/*
* Step 2
* map charcode (or GID for CID truetype)
* generate an Consortium encoding file and let fontforge handle it.
*
* - Always map to Unicode for 8bit TrueType fonts and CID fonts
*
* - For 8bit nonTruetype fonts:
* Try to calculate the correct Unicode value from the glyph names, unless param->always_apply_tounicode is set
*
*/
use_tounicode = ((suffix == ".ttf") || (font->isCIDFont()) || (param->always_apply_tounicode));
auto ctu = font->getToUnicode();