This is where ImportC should shine, we'd no longer have to maintain bindings manually (hopefully)

On Thursday, 3 June 2021 at 11:42:05 UTC, Ola Fosheim Grøstad wrote:

Actually I tried this as quick hack and it writes text on top of C API demo.

So it is indeed just thin wrapper, and it makes possible to extend bindings to load text functions on top of it.

HACK: DO NOT USE

main.d (add on top)

extern(C++)
{
    class SkPaint;

    alias SkScalar = float;

    enum SkTextEncoding
    {
        kUTF8,      //!< uses bytes to represent UTF-8 or ASCII
        kUTF16,     //!< uses two byte words to represent most of Unicode
        kUTF32,     //!< uses four byte words to represent all of Unicode
        kGlyphID,   //!< uses two byte words to represent glyph indices
    }

    final class SkCanvas
    {
        void drawSimpleText(const(void)* text, size_t byteLength, SkTextEncoding encoding,
                            SkScalar x, SkScalar y, ref const SkFont font, ref const SkPaint paint);

        alias drawSimpleTextFn = void function(SkCanvas this_,
                            const(void)* text, size_t byteLength, SkTextEncoding encoding,
                            SkScalar x, SkScalar y, ref const SkFont font, ref const SkPaint paint);
    }

    extern(C++, class)
    struct SkFont
    {
        byte[256] instanceData_; // hack, reserve enough space to fit all data, since I don't know actual size

        //@disable this();
        //pragma(msg, SkFont.__ctor.mangleof);

        alias ctorFn = void function(SkFont* this_);
    }
}

main.d (insert at the end of draw function before delete block)

void draw(sk_canvas_t* canvas) {
    // ...

    sk_paint_t* strokeText = sk_paint_new();
    sk_paint_set_stroke(strokeText, true);
    sk_paint_set_stroke_width(strokeText, 1.0f);

    import core.sys.windows.windows;
    auto lib = LoadLibrary("skia.dll");
    SkCanvas.drawSimpleTextFn drawTextFnPtr = cast(SkCanvas.drawSimpleTextFn) GetProcAddress(lib, "?drawSimpleText@SkCanvas@@QEAAXPEBX_KW4SkTextEncoding@@MMAEBVSkFont@@AEBVSkPaint@@@Z");

    SkFont fnt;
    SkFont.ctorFn skFontCtorPtr = cast(SkFont.ctorFn) GetProcAddress(lib, "??0SkFont@@QEAA@XZ");
    skFontCtorPtr(&fnt);

    enum text = "test dynamic text";
    drawTextFnPtr(cast(SkCanvas)canvas, text.ptr, text.length, SkTextEncoding.kUTF8, 150, 150, fnt, *cast(SkPaint*) strokeText);

    sk_paint_delete(strokeText);

    // deleters
}