TestFrameReduction.cpp File Reference

#include "video/geometry/FrameReduction.h"
#include <algorithm>
#include <cstdint>
#include <utility>
#include <vector>
#include <gtest/gtest.h>

Functions
	TEST (TestFrameReduction, UniformFrameStaysUniform)
	TEST (TestFrameReduction, LetterboxBoundarySurvivesAtItsScaledPosition)
	TEST (TestFrameReduction, TopAlignedTenBitReadsAsItsHighByte)
	TEST (TestFrameReduction, ASourceSmallerThanTheTargetIsCopiedAtItsOwnSize)
	TEST (TestFrameReduction, ASourceAtTheOutputSizeIsCopiedSampleForSample)
	TEST (TestFrameReduction, OutputSizeIsTheExtentReduceFrameProduces)
	TEST (TestFrameReduction, AnUndescribableSourceIsRefused)

Function Documentation

TEST() [1/7]

TEST	(	TestFrameReduction	,
		AnUndescribableSourceIsRefused	)

TEST() [2/7]

TEST	(	TestFrameReduction	,
		ASourceAtTheOutputSizeIsCopiedSampleForSample	)

A source already at the output size takes a straight copy rather than a box average over boxes of one sample. It has to land on the same answer sample for sample - this is the whole of the Direct3D path, where the staging texture arrives at the output size, and any disagreement would move a boundary the detector then reads.

The stride is padded past the width, as a mapped staging texture's row pitch is.

TEST() [3/7]

TEST	(	TestFrameReduction	,
		ASourceSmallerThanTheTargetIsCopiedAtItsOwnSize	)

TEST() [4/7]

TEST	(	TestFrameReduction	,
		LetterboxBoundarySurvivesAtItsScaledPosition	)

The property the whole reduced path rests on: a letterbox boundary survives the downscale at its scaled position. Bars at coded rows 0..280 of 2160 reduce by 4 to rows 0..70 of 540; the rows either side of the boundary must be cleanly bar and cleanly picture, because that is what the detector's dark-and-flat walk reads.

TEST() [5/7]

TEST	(	TestFrameReduction	,
		OutputSizeIsTheExtentReduceFrameProduces	)

A GPU reducer sizes its blit target with ReductionOutputSize and hands the result to ReduceFrame, so the two must agree on the extent for any source shape.

TEST() [6/7]

TEST	(	TestFrameReduction	,
		TopAlignedTenBitReadsAsItsHighByte	)

TEST() [7/7]

TEST	(	TestFrameReduction	,
		UniformFrameStaysUniform	)