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Refactored and tested zoom on Android
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57 changes: 57 additions & 0 deletions
57
packages/camera/camera/android/src/main/java/io/flutter/plugins/camera/CameraZoom.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| package io.flutter.plugins.camera; | ||
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| import android.graphics.Rect; | ||
| import androidx.annotation.NonNull; | ||
| import androidx.annotation.Nullable; | ||
| import androidx.core.math.MathUtils; | ||
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| public final class CameraZoom | ||
| { | ||
| public static final float DEFAULT_ZOOM_FACTOR = 1.0f; | ||
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| @NonNull | ||
| private final Rect cropRegion = new Rect(); | ||
| @Nullable | ||
| private final Rect sensorSize; | ||
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| public final float maxZoom; | ||
| public final boolean hasSupport; | ||
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| public CameraZoom(@Nullable final Rect sensorArraySize, final Float maxZoom) | ||
| { | ||
| this.sensorSize = sensorArraySize; | ||
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| if (this.sensorSize == null) | ||
| { | ||
| this.maxZoom = DEFAULT_ZOOM_FACTOR; | ||
| this.hasSupport = false; | ||
| return; | ||
| } | ||
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| this.maxZoom = ((maxZoom == null) || (maxZoom < DEFAULT_ZOOM_FACTOR)) | ||
| ? DEFAULT_ZOOM_FACTOR | ||
| : maxZoom; | ||
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| this.hasSupport = (Float.compare(this.maxZoom, DEFAULT_ZOOM_FACTOR) > 0); | ||
| } | ||
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| public Rect computeZoom(final float zoom) { | ||
| if (sensorSize == null || !this.hasSupport) { | ||
| return null; | ||
| } | ||
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| final float newZoom = MathUtils.clamp(zoom, DEFAULT_ZOOM_FACTOR, this.maxZoom); | ||
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| final int centerX = this.sensorSize.width() / 2; | ||
| final int centerY = this.sensorSize.height() / 2; | ||
| final int deltaX = (int)((0.5f * this.sensorSize.width()) / newZoom); | ||
| final int deltaY = (int)((0.5f * this.sensorSize.height()) / newZoom); | ||
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| this.cropRegion.set(centerX - deltaX, | ||
| centerY - deltaY, | ||
| centerX + deltaX, | ||
| centerY + deltaY); | ||
|
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| return cropRegion; | ||
| } | ||
| } |
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121 changes: 121 additions & 0 deletions
121
packages/camera/camera/android/src/test/java/io/flutter/plugins/camera/CameraZoomTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| package io.flutter.plugins.camera; | ||
|
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| import static org.junit.Assert.assertEquals; | ||
| import static org.junit.Assert.assertNotNull; | ||
| import static org.junit.Assert.assertFalse; | ||
| import static org.junit.Assert.assertNull; | ||
| import static org.junit.Assert.assertTrue; | ||
|
|
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| import android.graphics.Rect; | ||
| import org.junit.Test; | ||
| import org.junit.runner.RunWith; | ||
| import org.robolectric.RobolectricTestRunner; | ||
|
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| @RunWith(RobolectricTestRunner.class) | ||
| public class CameraZoomTest { | ||
|
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| @Test | ||
| public void ctor_when_parameters_are_valid() { | ||
| final Rect sensorSize = new Rect(0,0,0,0); | ||
| final Float maxZoom = 4.0f; | ||
| final CameraZoom cameraZoom = new CameraZoom(sensorSize, maxZoom); | ||
|
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| assertNotNull(cameraZoom); | ||
| assertTrue(cameraZoom.hasSupport); | ||
| assertEquals(4.0f, cameraZoom.maxZoom, 0); | ||
| assertEquals(1.0f, CameraZoom.DEFAULT_ZOOM_FACTOR, 0); | ||
| } | ||
|
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| @Test | ||
| public void ctor_when_sensor_size_is_null() { | ||
| final Rect sensorSize = null; | ||
| final Float maxZoom = 4.0f; | ||
| final CameraZoom cameraZoom = new CameraZoom(sensorSize, maxZoom); | ||
|
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| assertNotNull(cameraZoom); | ||
| assertFalse(cameraZoom.hasSupport); | ||
| assertEquals( cameraZoom.maxZoom, 1.0f, 0); | ||
| } | ||
|
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| @Test | ||
| public void ctor_when_max_zoom_is_null() { | ||
| final Rect sensorSize = new Rect(0,0,0,0); | ||
| final Float maxZoom = null; | ||
| final CameraZoom cameraZoom = new CameraZoom(sensorSize, maxZoom); | ||
|
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| assertNotNull(cameraZoom); | ||
| assertFalse(cameraZoom.hasSupport); | ||
| assertEquals( cameraZoom.maxZoom, 1.0f, 0); | ||
| } | ||
|
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| @Test | ||
| public void ctor_when_max_zoom_is_smaller_then_default_zoom_factor() { | ||
| final Rect sensorSize = new Rect(0,0,0,0); | ||
| final Float maxZoom = 0.5f; | ||
| final CameraZoom cameraZoom = new CameraZoom(sensorSize, maxZoom); | ||
|
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| assertNotNull(cameraZoom); | ||
| assertFalse(cameraZoom.hasSupport); | ||
| assertEquals( cameraZoom.maxZoom, 1.0f, 0); | ||
| } | ||
|
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| @Test | ||
| public void setZoom_when_no_support_should_not_set_scaler_crop_region() { | ||
| final CameraZoom cameraZoom = new CameraZoom(null, null); | ||
| final Rect computedZoom = cameraZoom.computeZoom(2f); | ||
|
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| assertNull(computedZoom); | ||
| } | ||
|
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| @Test | ||
| public void setZoom_when_sensor_size_equals_zero_should_return_crop_region_of_zero() { | ||
| final Rect sensorSize = new Rect(0, 0, 0, 0); | ||
| final CameraZoom cameraZoom = new CameraZoom(sensorSize, 20f); | ||
| final Rect computedZoom = cameraZoom.computeZoom(18f); | ||
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| assertNotNull(computedZoom); | ||
| assertEquals(computedZoom.left, 0); | ||
| assertEquals(computedZoom.top, 0); | ||
| assertEquals(computedZoom.right, 0); | ||
| assertEquals(computedZoom.bottom, 0); | ||
| } | ||
|
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| @Test | ||
| public void setZoom_when_sensor_size_is_valid_should_return_crop_region() { | ||
| final Rect sensorSize = new Rect(0, 0, 100, 100); | ||
| final CameraZoom cameraZoom = new CameraZoom(sensorSize, 20f); | ||
| final Rect computedZoom = cameraZoom.computeZoom(18f); | ||
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| assertNotNull(computedZoom); | ||
| assertEquals(computedZoom.left, 48); | ||
| assertEquals(computedZoom.top, 48); | ||
| assertEquals(computedZoom.right, 52); | ||
| assertEquals(computedZoom.bottom, 52); | ||
| } | ||
|
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| @Test | ||
| public void setZoom_when_zoom_is_greater_then_max_zoom_clamp_to_max_zoom() { | ||
| final Rect sensorSize = new Rect(0, 0, 100, 100); | ||
| final CameraZoom cameraZoom = new CameraZoom(sensorSize, 10f); | ||
| final Rect computedZoom = cameraZoom.computeZoom(25f); | ||
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| assertNotNull(computedZoom); | ||
| assertEquals(computedZoom.left, 45); | ||
| assertEquals(computedZoom.top, 45); | ||
| assertEquals(computedZoom.right, 55); | ||
| assertEquals(computedZoom.bottom, 55); | ||
| } | ||
|
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| @Test | ||
| public void setZoom_when_zoom_is_smaller_then_min_zoom_clamp_to_min_zoom() { | ||
| final Rect sensorSize = new Rect(0, 0, 100, 100); | ||
| final CameraZoom cameraZoom = new CameraZoom(sensorSize, 10f); | ||
| final Rect computedZoom = cameraZoom.computeZoom(0.5f); | ||
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| assertNotNull(computedZoom); | ||
| assertEquals(computedZoom.left, 0); | ||
| assertEquals(computedZoom.top, 0); | ||
| assertEquals(computedZoom.right, 100); | ||
| assertEquals(computedZoom.bottom, 100); | ||
| } | ||
| } |
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