使用SDK的嵌入字体功能,导致文件体积变大,且嵌入多个字体时耗时较长,该如何解决?

问题原因:在10.0之前的版本中,嵌入字体Font::Embed ()接口,是嵌入整个字体文件,包含所有字符。所以会导致嵌入时耗时长,和文件体积增大的情况。

解决办法:在10.0及以上的版本中,Font类型增加了Font::AddUnicodes ()接口,支持按用户指定字符数组嵌入字体,C++的示例代码如下:

 PDFDoc doc;
    doc.Load(NULL);
    PDFPage page= doc.InsertPage(0,PDFPage::e_SizeA4);
    page.StartParse(0, NULL, true);
    POSITION position = page.GetLastGraphicsObjectPosition(GraphicsObject::e_TypeText);
TextObject* text_object = TextObject::Create();
    Font font = Font(L"Noto Sans CJK HK", Font::e_StylesSmallCap, Font::e_CharsetANSI, 0);
    //第二个参数为false时,返回的嵌入字体,将只嵌入指定字符(默认为true)
    Font font_Embed = font.Embed(doc, false);
    TextState state;
    WString  wstr = L"foxitsoftware";
    UInt32Array wstr_Unicode;
    //设置要嵌入的字符
    for (int i = 0; i < wstr.GetLength(); i++)
    {
        wstr_Unicode.Add(static_cast<uint32_t>(wstr[i]));
    }
UInt32Array wstr_Unicod_Embed = font_Embed.AddUnicodes(doc, wstr_Unicode);
//检查指定的字符是否全部成功嵌入    
if (wstr_Unicode.GetSize() == wstr_Unicod_Embed.GetSize())
{  
        state.font = font_Embed;
    }
    state.font_size = 48;
    state.textmode = TextState::e_ModeFillStrokeClip;

    text_object->SetTextState(page, state, true, 750);
    text_object->SetText(wstr);

    text_object->SetFillColor(0xFFAAAAAA);
    text_object->SetStrokeColor(0xFFF68C21);
    page.InsertGraphicsObject(position, text_object);

    RectF rect = text_object->GetRect();
    float offset_x = (page.GetWidth() - (rect.right - rect.left)) / 2;
    float offset_y = page.GetHeight() * 0.8f - (rect.top - rect.bottom) / 2;
    text_object->Transform(Matrix(1, 0, 0, 1, offset_x, offset_y), false);
    page.GenerateContent()
    doc.SaveAs(L"D:/test.pdf", 0);