stb_truetype: Rendering CJK Text and Characters

[blazer2k1]

Anyone can give an example on how to render unicode font characters like CJK?

I'm using Microsoft YaHei to load font, but no clue where to start.

[floppyhammer]

Hope this helps.

#include <codecvt>

std::string textInput;

std::wstring_convert<std::codecvt_utf8<char32_t>, char32_t> converter;
auto textU32 = converter.from_bytes(textInput);

float scale = stbtt_ScaleForPixelHeight(&stbttInfo, pointSize);

int unscaledAscent;
int unscaledDescent;
int unscaledLineGap;
stbtt_GetFontVMetrics(&stbttInfo, &unscaledAscent, &unscaledDescent, &unscaledLineGap);

float ascent = roundf(float(unscaledAscent) * scale);
float descent = roundf(float(unscaledDescent) * scale);

for (char32_t codepoint : textU32) {
    uint16_t glyphIndex = stbtt_FindGlyphIndex(&stbttInfo, (int)codepoint);

    // Get advance.
    int advanceWidth;
    int leftSideBearing;
    stbtt_GetGlyphHMetrics(&stbttInfo, glyphIndex, &advanceWidth, &leftSideBearing);
    float advance = advanceWidth * scale;

    // If you want a rasterized glyph, call stbtt_GetGlyphBitmap.
    // If you want to render the glyph yourself, call stbtt_GetGlyphShape to get the glyph shapes.
}

[blazer2k1]

Thanks @floppyhammer, will try.