[libcamera-devel] [PATCH] libcamera: geometry: Add helper functions to the Size class

[Laurent Pinchart]

Hi Jacopo,

On Fri, Jul 10, 2020 at 12:05:16PM +0200, Jacopo Mondi wrote:
> On Fri, Jul 10, 2020 at 11:24:55AM +0300, Laurent Pinchart wrote:
> > Pipeline handlers commonly have to calculate the minimum or maximum of
> > multiple sizes, or align a size's width and height. Add helper functions
> > to the Size class to perform those tasks.
> >
> > Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> > ---
> >  include/libcamera/geometry.h | 25 +++++++++++++++++++++++++
> >  src/libcamera/geometry.cpp   | 26 ++++++++++++++++++++++++++
> >  test/geometry.cpp            | 22 ++++++++++++++++++++++
> >  3 files changed, 73 insertions(+)
> >
> > diff --git a/include/libcamera/geometry.h b/include/libcamera/geometry.h
> > index 7d4b8bcfe3d8..c1411290f163 100644
> > --- a/include/libcamera/geometry.h
> > +++ b/include/libcamera/geometry.h
> > @@ -8,6 +8,7 @@
> >  #ifndef __LIBCAMERA_GEOMETRY_H__
> >  #define __LIBCAMERA_GEOMETRY_H__
> >
> > +#include <algorithm>
> >  #include <string>
> >
> >  namespace libcamera {
> > @@ -43,6 +44,30 @@ struct Size {
> >
> >  	bool isNull() const { return !width && !height; }
> >  	const std::string toString() const;
> > +
> > +	Size alignedTo(unsigned int hAlignment, unsigned int vAlignment) const
> 
> Should this take a Size ?

I've thought about it, but it's really two alignments, not a size.

> Also, is aligned always assumed to happen to next largest integer ?
> Shouldn't this be alignIncrease or similar ?

alignedUpTo and alignedDownTo ? roundedDownTo and roundedUpTo ? Do you
need both in the IPU3 pipeline handler ?

> > +	{
> > +		return {
> > +			(width + hAlignment - 1) / hAlignment * hAlignment,
> > +			(height + vAlignment - 1) / vAlignment * vAlignment
> > +		};
> > +	}
> > +
> > +	Size boundedTo(const Size &bound) const
> > +	{
> > +		return {
> > +			std::min(width, bound.width),
> > +			std::min(height, bound.height)
> > +		};
> > +	}
> > +
> > +	Size expandedTo(const Size &expand) const
> > +	{
> > +		return {
> > +			std::max(width, expand.width),
> > +			std::max(height, expand.height)
> > +		};
> > +	}
> >  };
> >
> >  bool operator==(const Size &lhs, const Size &rhs);
> > diff --git a/src/libcamera/geometry.cpp b/src/libcamera/geometry.cpp
> > index 24c44fb43acf..d647c5efbdb1 100644
> > --- a/src/libcamera/geometry.cpp
> > +++ b/src/libcamera/geometry.cpp
> > @@ -122,6 +122,32 @@ const std::string Size::toString() const
> >  	return std::to_string(width) + "x" + std::to_string(height);
> >  }
> >
> > +/**
> > + * \fn Size::alignedTo(unsigned int hAlignment, unsigned int vAlignment)
> > + * \brief Align the size horizontally and vertically
> > + * \param[in] hAlignment Horizontal alignment
> > + * \param[in] vAlignment Vertical alignment
> > + * \return A Size whose width and height are equal to the width and height of
> > + * this size aligned to the next multiple of \a hAlignment and \a vAlignment
> > + * respectively
> > + */
> > +
> > +/**
> > + * \fn Size::boundedTo(const Size &bound)
> > + * \brief Bound the size to \a bound
> > + * \param[in] bound The maximum size
> > + * \return A Size whose width and height are the minimum of the width and
> > + * height of this size and the \a bound size
> > + */
> > +
> > +/**
> > + * \fn Size::expandedTo(const Size &expand)
> > + * \brief Expand the size to \a expand
> > + * \param[in] expand The minimum size
> > + * \return A Size whose width and height are the maximum of the width and
> > + * height of this size and the \a expand size
> > + */
> > +
> >  /**
> >   * \brief Compare sizes for equality
> >   * \return True if the two sizes are equal, false otherwise
> > diff --git a/test/geometry.cpp b/test/geometry.cpp
> > index 904ad92c9448..5ef7cb7c9014 100644
> > --- a/test/geometry.cpp
> > +++ b/test/geometry.cpp
> > @@ -46,6 +46,28 @@ protected:
> >  			return TestFail;
> >  		}
> >
> > +		/* Test alignedTo(), boundedTo() and expandedTo() */
> > +		if (Size(0, 0).alignedTo(16, 8) != Size(0, 0) ||
> > +		    Size(1, 1).alignedTo(16, 8) != Size(16, 8) ||
> > +		    Size(16, 8).alignedTo(16, 8) != Size(16, 8)) {
> > +			cout << "Size::alignedTo() test failed" << endl;
> > +			return TestFail;
> > +		}
> > +
> > +		if (Size(0, 0).boundedTo({ 100, 100 }) != Size(0, 0) ||
> > +		    Size(200, 50).boundedTo({ 100, 100 }) != Size(100, 50) ||
> > +		    Size(50, 200).boundedTo({ 100, 100 }) != Size(50, 100)) {
> > +			cout << "Size::boundedTo() test failed" << endl;
> > +			return TestFail;
> > +		}
> > +
> > +		if (Size(0, 0).expandedTo({ 100, 100 }) != Size(100, 100) ||
> > +		    Size(200, 50).expandedTo({ 100, 100 }) != Size(200, 100) ||
> > +		    Size(50, 200).expandedTo({ 100, 100 }) != Size(100, 200)) {
> > +			cout << "Size::expandedTo() test failed" << endl;
> > +			return TestFail;
> > +		}
> > +
> 
> Looks good and will use it in the IPU3 series.
> 
> >  		/* Test Size equality and inequality. */
> >  		if (!compare(Size(100, 100), Size(100, 100), &operator==, "==", true))
> >  			return TestFail;

-- 
Regards,

Laurent Pinchart