how to add chinese text

[钟文煜]

// 读取字体文件
std::ifstream fontFile("Chinese.ttf", std::ios::binary | std::ios::ate);
std::streamsize streamsize = fontFile.tellg();
fontFile.seekg(0, std::ios::beg);
std::vector<uint8_t> fontData(streamsize);
if (!fontFile.read(reinterpret_cast<char*>(fontData.data()), streamsize)) {
return -1;
}

// 加载字体
FPDF_FONT font = FPDFText_LoadFont(p_reader->p_reader_->RawDoc(), fontData.data(), fontData.size(), FPDF_FONT_TRUETYPE, true);
if (font == nullptr) {
return -1;
}

// 创建文本对象
FPDF_PAGEOBJECT text_object3 = FPDFPageObj_CreateTextObj(p_reader->p_reader_->RawDoc(), font, 12.0f);
FPDFText_SetText(text_object3, FPDF_WIDESTRING(rect_type2));
FPDFPageObj_SetFillColor(text_object3, 0, 0, 255, 150);
FPDFPageObj_Transform(text_object3, 1, 0, 0, 1, 200, 600);
FPDFPage_InsertObject(p_page, text_object3);

The above code cannot add Chinese text

[Lei Zhang]

Both FPDFEditEmbedderTest.EmbedNotoSansSCFontWithCharcodes and
FPDFEditEmbedderTest.EmbedNotoSansSCFont in
fpdfsdk/fpdf_edit_embeddertest.cpp generate PDFs with Chinese text.

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[钟文煜]

pdfium::span<const uint8_t> span = CIDfont.GetFontSpan();
After obtaining the font content, how to filter part of the data, for example, I only need the font data of the word "妈"

[Lei Zhang]

You'll need to use a font subsetter to do that.

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[钟文煜]

1、load font

2、subset

3、but loca and glypy is null

4、Check that loca is normal