Tests HEIC loading in apple platforms (#917)

* Tests HEIC loading in apple platforms

* Try to use CGColorSpaceCreateDeviceRGB

* It seems that the decoded HEIC image is different on some devices, let's use PSNR instead to be more lax

korim/src/darwinMain/kotlin/com/soywiz/korim/format/cg/CGNativeImageFormatProvider.kt

@@ -112,8 +112,8 @@ open class CGNativeImageFormatProvider : CGBaseNativeImageFormatProvider() {
                             } else {
 
                                 //val colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB)
-                                val colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB)
-                                //val colorSpace = CGColorSpaceCreateDeviceRGB()
+                                //val colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB)
+                                val colorSpace = CGColorSpaceCreateDeviceRGB()
                                 try {
                                     val realPremultiplied = true
                                     //val realPremultiplied = premultiplied

korim/src/darwinTest/kotlin/com/soywiz/korim/format/HEICTest.kt

@@ -0,0 +1,20 @@
+package com.soywiz.korim.format
+
+import com.soywiz.korim.bitmap.*
+import com.soywiz.korio.async.*
+import com.soywiz.korio.file.std.*
+import kotlin.test.*
+
+class HEICTest {
+    @Test
+    fun test() = suspendTest {
+        val heic = resourcesVfs["heic.heic"].readBitmap().toBMP32().premultiplied()
+        val png = resourcesVfs["heic.heic.png"].readBitmap(PNG.toProps()).toBMP32().premultiplied()
+        //localVfs("/tmp/heic.heic.png").writeBitmap(heic, PNG)
+        assertGreaterOrEqual(30.0, Bitmap32.computePsnr(heic, png), message = "PSNR")
+    }
+
+    fun assertGreaterOrEqual(expected: Double, actual: Double, message: String = "") {
+        assertTrue("Expected $actual >= $expected : $message") { actual >= expected }
+    }
+}