risp4ml/isp_stages/wbg_test.cc

/*
 * Copyright 2023 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "risp4ml/isp_stages/wbg.h"

#include "pw_unit_test/framework.h"
#include "risp4ml/common/constants.h"
#include "risp4ml/common/test_utils.h"

static constexpr uint16_t kWbgFractional = kRawPipelineFraction;
static constexpr uint16_t kFrameWidth = 4;
static constexpr uint16_t kFrameHeight = 4;

class WbgTest : public ::testing::Test {
 protected:
  void SetUp() override {
    in_ = image_new(1, kFrameHeight, kFrameWidth);
    out_ = image_new(1, kFrameHeight, kFrameWidth);
    num_bytes_ =
        in_->num_channels * in_->height * in_->width * sizeof(pixel_type_t);
  }
  void TearDown() override {
    image_delete(in_);
    image_delete(out_);
  }

  Image* in_;
  Image* out_;
  uint32_t num_bytes_;
};

TEST_F(WbgTest, IdentityTest) {
  // Use a grey input image.
  InitImageRandom(in_, kRawPipelineMinVal, kRawPipelineMaxVal);
  memcpy(out_->data, in_->data, num_bytes_);

  // set the params to something boring.
  uint32_t gain = 1 << kWbgFractional;
  WbgParams params = {
      .enable = true, .fixed = true, .gains = {gain, gain, gain, gain}};
  set_wbg_params(&params);

  wbg_process(out_);
  for (uint16_t y = 0; y < kFrameHeight; y++) {
    for (uint16_t x = 0; x < kFrameWidth; x++) {
      ASSERT_EQ(image_pixel_val(in_, 0, y, x), image_pixel_val(out_, 0, y, x));
    }
  }
}

TEST_F(WbgTest, BayerTest) {
  // Use a grey input image.
  constexpr pixel_type_t kPixelVal = 1 << kWbgFractional;
  InitImage(in_, kPixelVal);
  memcpy(out_->data, in_->data, num_bytes_);

  // set the params to something boring.
  WbgParams params = {.enable = true,
                      .fixed = true,
                      .gains = {kPixelVal, kPixelVal, kPixelVal, kPixelVal}};
  set_wbg_params(&params);

  wbg_process(out_);

  for (uint16_t c1 = 0; c1 < 2; ++c1) {
    for (uint16_t c2 = 0; c2 < 2; ++c2) {
      for (uint16_t y = 0; y < kFrameHeight / 2; y++) {
        for (uint16_t x = 0; x < kFrameWidth / 2; x++) {
          ASSERT_EQ(kPixelVal,
                    image_pixel_val(out_, 0, 2 * y + c1, 2 * x + c2));
        }
      }
    }
  }
}

TEST_F(WbgTest, SaturationTest) {
  // Use a grey input image.
  constexpr pixel_type_t kPixelValHi = kRawPipelineMaxVal - 10;
  InitImage(in_, kPixelValHi);
  memcpy(out_->data, in_->data, num_bytes_);

  uint32_t gain = 2 * (1 << kWbgFractional);
  WbgParams params = {
      .enable = true, .fixed = true, .gains = {gain, gain, gain, gain}};
  set_wbg_params(&params);

  wbg_process(out_);

  for (uint16_t y = 0; y < kFrameHeight; y++) {
    for (uint16_t x = 0; x < kFrameWidth; x++) {
      ASSERT_EQ(kRawPipelineMaxVal, image_pixel_val(out_, 0, y, x));
    }
  }
}