Function renderString

src/cinder/Text.cpp:638–705

}
#elif defined( CINDER_MAC) || defined( CINDER_MSW_DESKTOP ) || defined( CINDER_ANDROID ) || defined( CINDER_LINUX )
Surface renderString( const string &str, const Font &font, const ColorA &color, float *baselineOffset )
{
	Line line;
	line.addRun( Run( str, font, color ) );
	line.mJustification = Line::LEFT;
	line.mLeadingOffset = 0;	
	line.calcExtents();

	float totalWidth = line.mWidth;
	float totalHeight = line.mHeight;
	int pixelWidth = (int)math<float>::ceil( totalWidth );
	int pixelHeight = (int)math<float>::ceil( totalHeight );

	// Odd failure - return a NULL Surface
	if( ( pixelWidth < 0 ) || ( pixelHeight < 0 ) )
		return Surface();

#if defined( CINDER_MAC )
	Surface result( pixelWidth, pixelHeight, true, SurfaceChannelOrder::RGBA );
	::CGContextRef cgContext = cocoa::createCgBitmapContext( result );
	ip::fill( &result, ColorA( 0, 0, 0, 0 ) );

	float currentY = totalHeight + 1.0f;
	currentY -= line.mAscent + line.mLeadingOffset;
	line.render( cgContext, currentY, (float)0, pixelWidth );

	// force all the rendering to finish and release the context
	::CGContextFlush( cgContext );
	::CGContextRelease( cgContext );

	ip::unpremultiply( &result );
#elif defined( CINDER_MSW_DESKTOP )
	// I don't have a great explanation for this other than it seems to be necessary
	pixelHeight += 1;
	// prep our GDI and GDI+ resources
	::HDC dc = TextManager::instance()->getDc();
	Surface result( pixelWidth, pixelHeight, true, SurfaceConstraintsGdiPlus() );
	Gdiplus::Bitmap *offscreenBitmap = msw::createGdiplusBitmap( result );
	//Gdiplus::Bitmap *offscreenBitmap = new Gdiplus::Bitmap( pixelWidth, pixelHeight, (premultiplied) ? PixelFormat32bppPARGB : PixelFormat32bppARGB );
	Gdiplus::Graphics *offscreenGraphics = Gdiplus::Graphics::FromImage( offscreenBitmap );
	// high quality text rendering
	offscreenGraphics->SetTextRenderingHint( Gdiplus::TextRenderingHintAntiAlias );
	// fill the surface with the background color
	offscreenGraphics->Clear( Gdiplus::Color( (BYTE)(0), (BYTE)(0), 
			(BYTE)(0), (BYTE)(0) ) );

	// walk the lines and render them, advancing our Y offset along the way
	float currentY = 0;
	currentY += line.mLeadingOffset + line.mLeading;
	line.render( offscreenGraphics, currentY, (float)0, (float)pixelWidth );

	::GdiFlush();

	delete offscreenBitmap;
	delete offscreenGraphics;
#elif defined( CINDER_ANDROID ) || defined( CINDER_LINUX )
	Surface result = Surface( pixelWidth, pixelHeight, true, SurfaceConstraintsDefault() );
	ip::fill( &result, ColorA( 0, 0, 0, 0 ) );