Rendering Color Emoji using Glyph with DirectWrite 1.2

Windows 8.1でカラー絵文字を表示するサンプルでTranslateColorGlyphRunを使ってグリフベースで書く方法が存在してないのでサンプルを書いた。

	void DrawGlyphRun(ID2D1RenderTarget* target, IDWriteFactory factory, IDWriteFont* fontFace, ID2D1Brush* defaultBrush, DWRITE_GLYPH_RUN* glyphRun)
	{
	bool isColor = false;
	IDWriteColorGlyphRunEnumerator* colorLayer;
	IDWriteFont2* fontFace2;
	fontFace->QueryInterface(reinterpret_cast<IDWriteFontFace2**>(&fontFace2));
	if (fontFace2->IsColorFont()) {
	IDWriteFactory2* factory2;
	factory->QueryIntarface(reinterpret_cast<IDWriteFactory2**>(&factory2));
	if (SUCCEEDED(factory2->TranslateColorGlyphRun(0, 0, glyphRun, nullptr, DWRITE_MEASURING_MODE_NATURAL, nullptr, 0, &colorLayer))) {
	isColor = true;
	}
	}
	if (isColor) {
	BOOL hasRun;
	const DWRITE_COLOR_GLYPH_RUN* colorRun;
	while (true) {
	if (FAILED(colorLayer->MoveNext(&hasRun)) || !hasRun) {
	break;
	}
	if (FAILED(colorLayer->GetCurrentRun(&colorRun))) {
	break;
	}
	ID2DBrush* brush = nullptr;
	if (colorRun->runColor.r == 0.0 && colorRun->runColor.g == 0.0 && colorRun->runColor.b == 0.0 && ColorRun->runColor.a == 0.0) {
	target->CreateSolidColorBrush(colorRun->runColor, &brush);
	}
	target->DrawGlyphRun(point, glyphRun, brush ? brush : defaultBrush);
	if (brush) {
	brush->Release();
	}
	}
	} else {
	target->DrawGlyphRun(point, glyphRun, defaultBrush);
	}
	}

view raw colorglyph.cpp hosted with ❤ by GitHub

適当に書いたものなので動かないとは思うけど、使い方は参考になるはず。というか、Microsoft、TranslateColorGlyphRunを使ったサンプルくらい公開してよ。