From ce3cc7c14ab0e237dd839132b3be002915a23f3d Mon Sep 17 00:00:00 2001
From: Alexander Bruy <alexander.bruy@gmail.com>
Date: Tue, 23 Jun 2020 15:49:17 +0300
Subject: [PATCH] rendering test for raster brightness/contrast filter

---
 tests/src/python/test_qgsrasterlayer.py       |  58 ++++++++++++++++++
 .../expected_raster_brightness20.png          | Bin 0 -> 198501 bytes
 .../expected_raster_brightness50.png          | Bin 0 -> 198501 bytes
 .../expected_raster_contrast100.png           | Bin 0 -> 198501 bytes
 .../expected_raster_contrast30.png            | Bin 0 -> 198501 bytes
 5 files changed, 58 insertions(+)
 create mode 100644 tests/testdata/control_images/expected_raster_brightness20/expected_raster_brightness20.png
 create mode 100644 tests/testdata/control_images/expected_raster_brightness50/expected_raster_brightness50.png
 create mode 100644 tests/testdata/control_images/expected_raster_contrast100/expected_raster_contrast100.png
 create mode 100644 tests/testdata/control_images/expected_raster_contrast30/expected_raster_contrast30.png

diff --git a/tests/src/python/test_qgsrasterlayer.py b/tests/src/python/test_qgsrasterlayer.py
index bf245d21ed79..6cd5507fec56 100644
--- a/tests/src/python/test_qgsrasterlayer.py
+++ b/tests/src/python/test_qgsrasterlayer.py
@@ -481,6 +481,64 @@ def testGammaCorrection(self):
 
         self.assertTrue(checker.runTest("expected_raster_gamma222"), "Gamma correction (gamma = 2.22) rendering test failed")
 
+    def testBrightnessContrast(self):
+        """ test raster brightness/contrast filter"""
+        path = os.path.join(unitTestDataPath(),
+                            'landsat_4326.tif')
+        info = QFileInfo(path)
+        base_name = info.baseName()
+        layer = QgsRasterLayer(path, base_name)
+        self.assertTrue(layer.isValid(), 'Raster not loaded: {}'.format(path))
+
+        layer.brightnessFilter().setContrast(100)
+
+        ms = QgsMapSettings()
+        ms.setLayers([layer])
+        ms.setExtent(layer.extent())
+
+        checker = QgsRenderChecker()
+        checker.setControlName("expected_raster_contrast100")
+        checker.setMapSettings(ms)
+
+        self.assertTrue(checker.runTest("expected_raster_contrast100"), "Contrast (c = 100) rendering test failed")
+
+        layer.brightnessFilter().setContrast(-30)
+
+        ms = QgsMapSettings()
+        ms.setLayers([layer])
+        ms.setExtent(layer.extent())
+
+        checker = QgsRenderChecker()
+        checker.setControlName("expected_raster_contrast30")
+        checker.setMapSettings(ms)
+
+        self.assertTrue(checker.runTest("expected_raster_contrast30"), "Contrast (c = -30) rendering test failed")
+
+        layer.brightnessFilter().setContrast(0)
+        layer.brightnessFilter().setBrightness(50)
+
+        ms = QgsMapSettings()
+        ms.setLayers([layer])
+        ms.setExtent(layer.extent())
+
+        checker = QgsRenderChecker()
+        checker.setControlName("expected_raster_brightness50")
+        checker.setMapSettings(ms)
+
+        self.assertTrue(checker.runTest("expected_raster_brightness50"), "Brightness (b = 50) rendering test failed")
+
+        layer.brightnessFilter().setBrightness(-20)
+
+        ms = QgsMapSettings()
+        ms.setLayers([layer])
+        ms.setExtent(layer.extent())
+
+        checker = QgsRenderChecker()
+        checker.setControlName("expected_raster_brightness20")
+        checker.setMapSettings(ms)
+
+        self.assertTrue(checker.runTest("expected_raster_brightness20"), "Brightness (b = -20) rendering test failed")
+
     def testPalettedColorTableToClassData(self):
         entries = [QgsColorRampShader.ColorRampItem(5, QColor(255, 0, 0), 'item1'),
                    QgsColorRampShader.ColorRampItem(3, QColor(0, 255, 0), 'item2'),
diff --git a/tests/testdata/control_images/expected_raster_brightness20/expected_raster_brightness20.png b/tests/testdata/control_images/expected_raster_brightness20/expected_raster_brightness20.png
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