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libcamera: software_isp: Move color mappings out of debayering

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Constructing the color mapping tables is related to stats rather than
debayering, where they are applied.  Let's move the corresponding code
to stats processing.

The same applies to the auxiliary gamma table.  As the gamma value is
currently fixed and used in a single place, with the temporary exception
mentioned below, there is no need to share it anywhere anymore.

It's necessary to initialize SoftwareIsp::debayerParams_ to default
values.  These initial values are used for the first two frames, before
they are changed based on determined stats.  To avoid sharing the gamma
value constant in artificial ways, we use 0.5 directly in the
initialization.  This all is not a particularly elegant thing to do,
such a code belongs conceptually to the similar code in stats
processing, but doing better is left for larger refactoring.

This is a preliminary step towards building this functionality on top of
libipa/algorithm.h, which should follow.

Signed-off-by: Milan Zamazal <mzamazal@redhat.com>
Reviewed-by: Andrei Konovalov <andrey.konovalov.ynk@gmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Milan Zamazal
2024-05-31 14:38:38 +02:00
committed by Laurent Pinchart
parent 4e13c6f55b
commit 539c62ff8e
6 changed files with 96 additions and 80 deletions
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src/libcamera/software_isp/debayer_cpu.h
+3 -8
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@@ -122,15 +122,12 @@ private:
void process2(const uint8_t *src, uint8_t *dst);
void process4(const uint8_t *src, uint8_t *dst);
static constexpr unsigned int kGammaLookupSize = 1024;
static constexpr unsigned int kRGBLookupSize = 256;
/* Max. supported Bayer pattern height is 4, debayering this requires 5 lines */
static constexpr unsigned int kMaxLineBuffers = 5;
std::array<uint8_t, kGammaLookupSize> gamma_;
std::array<uint8_t, kRGBLookupSize> red_;
std::array<uint8_t, kRGBLookupSize> green_;
std::array<uint8_t, kRGBLookupSize> blue_;
DebayerParams::ColorLookupTable red_;
DebayerParams::ColorLookupTable green_;
DebayerParams::ColorLookupTable blue_;
debayerFn debayer0_;
debayerFn debayer1_;
debayerFn debayer2_;
@@ -146,8 +143,6 @@ private:
unsigned int xShift_; /* Offset of 0/1 applied to window_.x */
bool enableInputMemcpy_;
bool swapRedBlueGains_;
float gammaCorrection_;
unsigned int blackLevel_;
unsigned int measuredFrames_;
int64_t frameProcessTime_;
/* Skip 30 frames for things to stabilize then measure 30 frames */