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1 package com.bartsent.simpleresizer
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2
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3 import android.graphics.Bitmap
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4 import android.graphics.BitmapFactory
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5 import android.graphics.Color
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6 import androidx.test.ext.junit.runners.AndroidJUnit4
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7 import androidx.test.platform.app.InstrumentationRegistry
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8 import com.bartsent.simpleresizer.lib.getScaledInstance
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9 import org.junit.Assert
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10 import org.junit.Test
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11 import org.junit.runner.RunWith
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12
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13 @RunWith(AndroidJUnit4::class)
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14 class ResizerTest {
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15 val ORIG_TILE_SIZE = 576
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16 val WIDTH_IN_TILES = 8
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17 val HEIGHT_IN_TILES = 6
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18 val CSTEP = 0x55
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19
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20 var count = 0
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21
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22 @Test
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23 fun canLoadImage() {
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24 val image = getBitmap()
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25 Assert.assertNotNull(image)
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26 checkBitmap(image, WIDTH_IN_TILES * ORIG_TILE_SIZE, HEIGHT_IN_TILES * ORIG_TILE_SIZE)
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27 }
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28
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29 @Test
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30 fun resizeVertical() {
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31 val image = getBitmap()
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32 val newWidth = image.width
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33 val newHeight = image.height / 2
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34 checkBitmap(image.getScaledInstance(newWidth, newHeight), newWidth, newHeight)
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35 }
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36
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37 @Test
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38 fun resizeHorizontal() {
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39 val image = getBitmap()
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40 val newWidth = image.width / 2
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41 val newHeight = image.height
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42 checkBitmap(image.getScaledInstance(newWidth, newHeight), newWidth, newHeight)
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43 }
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44
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45 @Test
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46 fun resizeBoth() {
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47 val image = getBitmap()
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48 val newWidth = image.width / 2
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49 val newHeight = image.height / 2
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50 checkBitmap(image.getScaledInstance(newWidth, newHeight), newWidth, newHeight)
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51 }
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52
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53 fun getBitmap(): Bitmap =
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54 InstrumentationRegistry.getInstrumentation().context.assets.open("testimage.png").use {
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55 BitmapFactory.decodeStream(it)
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56 }
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57
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58 fun getColor(): Int {
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59 count += 1
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60 val b = (count and 0x3)*CSTEP
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61 val temp = count shr 2
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62 val g = (temp and 0x3)*CSTEP
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63 val r = ((temp shr 2) and 0x3)*CSTEP
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64 return Color.rgb(r, g, b)
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65 }
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66
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67 fun resetColor() {
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68 count = 0
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69 }
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70
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71 fun checkBitmap(image: Bitmap, width: Int, height: Int) {
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72 Assert.assertEquals("width", width, image.width)
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73 Assert.assertEquals("height", height, image.height)
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74 val tileWidth = image.width / WIDTH_IN_TILES
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75 val tileHeight = image.height / HEIGHT_IN_TILES
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76 val tw2 = tileWidth / 2
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77 val th2 = tileHeight / 2
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78 resetColor()
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79 for (x in 0 until WIDTH_IN_TILES) {
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80 val xoff = tw2 + x * tileWidth
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81 for (y in 0 until HEIGHT_IN_TILES) {
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82 val yoff = th2 + y * tileHeight
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83 Assert.assertEquals("color @ tile $x, $y", getColor(), image.getPixel(xoff, yoff))
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84 }
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85 }
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86 }
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87 } |
