字符渲染，ExtTextOut转为IDWriteBitmapRenderTarget::DrawGlyphRun的问题

[lixiandejian]

使用字符图元索引渲染，ExtTextout输出成功，代码如下：

ExtTextOut(hdc,0,0,ETO_GLYPH_INDEX,NULL,(LPCWSTR)glyphIndices,glyphCount,lpDx);

glyphIndices,lpDx均是使用GetCharacterPlacement得到。

使用IDWriteBitmapRenderTarget::DrawGlyphRun渲染代码如下：

hr = 	DWriteBitmapRenderTarget_->DrawGlyphRun(10.0,100.0,measuringMode,glyphRun,renderingParams,RGB(0,0,0),&bRect);
	 if (SUCCEEDED(hr))
	 {
		 HDC memDC = NULL;
		 memDC = DWriteBitmapRenderTarget_->GetMemoryDC();
		 BitBlt(
		 	hdc,
		 	0, 0,
		 	500, 500,
		 	memDC,
		 	0, 0, 
		 	SRCCOPY
		 	);
	 }

glyphRun结构填充如下：

glyphRun.fontFace = pIDWriteFontFace;
	glyphRun.fontEmSize = (FLOAT)(dwrite_font_metrics.designUnitsPerEm);
	glyphRun.glyphIndices = glyphIndices;
	glyphRun.glyphCount = glyphCount;
	glyphRun.glyphOffsets = &glyphOffsets;
	glyphRun.isSideways = FALSE;
	glyphRun.bidiLevel = 4;
	glyphRun.glyphAdvances = glyphAdvances;

结果并不能正确渲染出字符，渲染出一些莫名的东西，感觉像是字符的一部分，请教是哪个参数可能有问题，初学这个，不太明白

[lixiandejian]

glyphRun.glyphOffsets = &glyphOffsets; //这句不对
glyphOffsets也应该是针对每一个字形的。可以结贴了。