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-rw-r--r--src/ipa/ipu3/ipu3.cpp70
1 files changed, 46 insertions, 24 deletions
diff --git a/src/ipa/ipu3/ipu3.cpp b/src/ipa/ipu3/ipu3.cpp
index b3ac96ed..757a5d50 100644
--- a/src/ipa/ipu3/ipu3.cpp
+++ b/src/ipa/ipu3/ipu3.cpp
@@ -19,6 +19,7 @@
#include <linux/v4l2-controls.h>
#include <libcamera/base/log.h>
+#include <libcamera/base/utils.h>
#include <libcamera/control_ids.h>
#include <libcamera/framebuffer.h>
@@ -136,8 +137,18 @@
* <linux/intel-ipu3.h> struct ipu3_uapi_gamma_corr_lut for further details.
*/
-static constexpr uint32_t kMaxCellWidthPerSet = 80;
-static constexpr uint32_t kMaxCellHeightPerSet = 60;
+/* Minimum grid width, expressed as a number of cells */
+static constexpr uint32_t kMinGridWidth = 16;
+/* Maximum grid width, expressed as a number of cells */
+static constexpr uint32_t kMaxGridWidth = 80;
+/* Minimum grid height, expressed as a number of cells */
+static constexpr uint32_t kMinGridHeight = 16;
+/* Maximum grid height, expressed as a number of cells */
+static constexpr uint32_t kMaxGridHeight = 60;
+/* log2 of the minimum grid cell width and height, in pixels */
+static constexpr uint32_t kMinCellSizeLog2 = 3;
+/* log2 of the maximum grid cell width and height, in pixels */
+static constexpr uint32_t kMaxCellSizeLog2 = 6;
namespace libcamera {
@@ -281,45 +292,56 @@ int IPAIPU3::start()
}
/**
+ * \brief Calculate a grid for the AWB statistics
+ *
* This function calculates a grid for the AWB algorithm in the IPU3 firmware.
* Its input is the BDS output size calculated in the ImgU.
* It is limited for now to the simplest method: find the lesser error
* with the width/height and respective log2 width/height of the cells.
*
- * \todo The frame is divided into cells which can be 8x8 => 128x128.
+ * \todo The frame is divided into cells which can be 8x8 => 64x64.
* As a smaller cell improves the algorithm precision, adapting the
* x_start and y_start parameters of the grid would provoke a loss of
* some pixels but would also result in more accurate algorithms.
*/
void IPAIPU3::calculateBdsGrid(const Size &bdsOutputSize)
{
- uint32_t minError = std::numeric_limits<uint32_t>::max();
Size best;
Size bestLog2;
/* Set the BDS output size in the IPAConfiguration structure */
context_.configuration.grid.bdsOutputSize = bdsOutputSize;
- for (uint32_t widthShift = 3; widthShift <= 6; ++widthShift) {
- uint32_t width = std::min(kMaxCellWidthPerSet,
- bdsOutputSize.width >> widthShift);
- width = width << widthShift;
- for (uint32_t heightShift = 3; heightShift <= 6; ++heightShift) {
- int32_t height = std::min(kMaxCellHeightPerSet,
- bdsOutputSize.height >> heightShift);
- height = height << heightShift;
- uint32_t error = std::abs(static_cast<int>(width - bdsOutputSize.width))
- + std::abs(static_cast<int>(height - bdsOutputSize.height));
-
- if (error > minError)
- continue;
-
- minError = error;
- best.width = width;
- best.height = height;
- bestLog2.width = widthShift;
- bestLog2.height = heightShift;
- }
+ uint32_t minError = std::numeric_limits<uint32_t>::max();
+ for (uint32_t shift = kMinCellSizeLog2; shift <= kMaxCellSizeLog2; ++shift) {
+ uint32_t width = std::clamp(bdsOutputSize.width >> shift,
+ kMinGridWidth,
+ kMaxGridWidth);
+
+ width = width << shift;
+ uint32_t error = std::abs(static_cast<int>(width - bdsOutputSize.width));
+ if (error >= minError)
+ continue;
+
+ minError = error;
+ best.width = width;
+ bestLog2.width = shift;
+ }
+
+ minError = std::numeric_limits<uint32_t>::max();
+ for (uint32_t shift = kMinCellSizeLog2; shift <= kMaxCellSizeLog2; ++shift) {
+ uint32_t height = std::clamp(bdsOutputSize.height >> shift,
+ kMinGridHeight,
+ kMaxGridHeight);
+
+ height = height << shift;
+ uint32_t error = std::abs(static_cast<int>(height - bdsOutputSize.height));
+ if (error >= minError)
+ continue;
+
+ minError = error;
+ best.height = height;
+ bestLog2.height = shift;
}
struct ipu3_uapi_grid_config &bdsGrid = context_.configuration.grid.bdsGrid;