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libcamera: software_isp: Use RGB type to represent gains

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Rather than using a custom struct to represent RGB values, let's use the
corresponding type and its facilities.

Signed-off-by: Milan Zamazal <mzamazal@redhat.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Milan Zamazal <mzamazal@redhat.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
Milan Zamazal 2025-03-26 10:08:39 +01:00 • committed by Kieran Bingham
parent 84f82c6b3c
commit 94e849bcf7
3 changed files with 16 additions and 22 deletions
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16
src/ipa/simple/algorithms/awb.cpp
View file

@ -25,7 +25,7 @@ int Awb::configure(IPAContext &context,
[[maybe_unused]] const IPAConfigInfo &configInfo)
{
auto &gains = context.activeState.awb.gains;
gains.red = gains.green = gains.blue = 1.0;
gains = { { 1.0, 1.0, 1.0 } };
return 0;
}
@ -56,16 +56,18 @@ void Awb::process(IPAContext &context,
* Clamp max gain at 4.0, this also avoids 0 division.
*/
auto &gains = context.activeState.awb.gains;
gains.red = sumR <= sumG / 4 ? 4.0 : static_cast<double>(sumG) / sumR;
gains.blue = sumB <= sumG / 4 ? 4.0 : static_cast<double>(sumG) / sumB;
/* Green gain is fixed to 1.0 */
gains = { {
sumR <= sumG / 4 ? 4.0 : static_cast<double>(sumG) / sumR,
1.0,
sumB <= sumG / 4 ? 4.0 : static_cast<double>(sumG) / sumB,
} };
RGB<double> rgbGains{ { 1 / gains.red, 1 / gains.green, 1 / gains.blue } };
RGB<double> rgbGains{ { 1 / gains.r(), 1 / gains.g(), 1 / gains.b() } };
context.activeState.awb.temperatureK = estimateCCT(rgbGains);
LOG(IPASoftAwb, Debug)
<< "gain R/B: " << gains.red << "/" << gains.blue
<< "; temperature: " << context.activeState.awb.temperatureK;
<< "gain R/B: " << gains << "; temperature: "
<< context.activeState.awb.temperatureK;
}
REGISTER_IPA_ALGORITHM(Awb, "Awb")

14
src/ipa/simple/algorithms/lut.cpp
View file

@ -103,16 +103,10 @@ void Lut::prepare(IPAContext &context,
const double div = static_cast<double>(DebayerParams::kRGBLookupSize) /
gammaTableSize;
/* Apply gamma after gain! */
unsigned int idx;
idx = std::min({ static_cast<unsigned int>(i * gains.red / div),
gammaTableSize - 1 });
params->red[i] = gammaTable[idx];
idx = std::min({ static_cast<unsigned int>(i * gains.green / div),
gammaTableSize - 1 });
params->green[i] = gammaTable[idx];
idx = std::min({ static_cast<unsigned int>(i * gains.blue / div),
gammaTableSize - 1 });
params->blue[i] = gammaTable[idx];
const RGB<double> lutGains = (gains * i / div).min(gammaTableSize - 1);
params->red[i] = gammaTable[static_cast<unsigned int>(lutGains.r())];
params->green[i] = gammaTable[static_cast<unsigned int>(lutGains.g())];
params->blue[i] = gammaTable[static_cast<unsigned int>(lutGains.b())];
}
}

8
src/ipa/simple/ipa_context.h
View file

@ -13,6 +13,8 @@
#include <libcamera/controls.h>
#include "libcamera/internal/vector.h"
#include <libipa/fc_queue.h>
namespace libcamera {
@ -36,11 +38,7 @@ struct IPAActiveState {
} blc;
struct {
struct {
double red;
double green;
double blue;
} gains;
RGB<double> gains;
unsigned int temperatureK;
} awb;