Working on exceptions

Content description of fabs

apng_library/src/main/java/oupson/apng/encoder/ApngEncoder.kt

@@ -222,16 +222,12 @@ class ApngEncoder(
         disposeOp: Utils.Companion.DisposeOp = Utils.Companion.DisposeOp.APNG_DISPOSE_OP_NONE
     ) {
         if (currentFrame == 0) {
-            if (btm.width != width)
-                throw InvalidFrameSizeException("Width of first frame must be equal to width of APNG. (${btm.width} != $width)")
-            if (btm.height != height)
-                throw InvalidFrameSizeException("Height of first frame must be equal to height of APNG. (${btm.height} != $height)")
+            if (btm.width != width || btm.height != height)
+                throw InvalidFrameSizeException(btm.width, btm.height, width, height, currentFrame == 0)
         }
 
-        if (btm.width > width)
-            throw InvalidFrameSizeException("Frame width must be inferior or equal at the animation width")
-        else if (btm.height > height)
-            throw InvalidFrameSizeException("Frame height must be inferior or equal at the animation height")
+        if (btm.width > width || btm.height > height)
+            throw InvalidFrameSizeException(btm.width, btm.height, width, height, currentFrame == 0)
 
         if (firstFrameInAnim || currentFrame != 0)
             writeFCTL(btm, delay, disposeOp, blendOp, xOffsets, yOffsets)
@@ -373,8 +369,9 @@ class ApngEncoder(
      * to conserve memory, this method grabs as many rows as will
      * fit into 32K bytes, or the whole image; whichever is less.
      *
+     * @param image The frame to encode
      *
-     * @return true if no errors; false if error grabbing pixels
+     * @return [Boolean] true if no errors; false if error grabbing pixels
      */
     private fun writeImageData(image: Bitmap): Boolean {
         var rowsLeft = height  // number of rows remaining to write

apng_library/src/main/java/oupson/apng/exceptions/customException.kt

@@ -4,6 +4,27 @@ class NoFrameException : Exception()
 class NotPngException : Exception()
 class NotApngException : Exception()
 class BadCRCException : Exception()
+
+// TODO BETTER MESSAGES
 class BadApngException(override val message: String? = null) : Exception()
 
-class InvalidFrameSizeException(override val message: String?) : Exception()
+class InvalidFrameSizeException(animationWidth : Int, animationHeight : Int, frameWidth : Int, frameHeight : Int, isFirstFrame : Boolean) : Exception() {
+    override val message: String = when {
+        animationWidth != frameWidth && isFirstFrame -> {
+            "Width of first frame must be equal to width of APNG ($animationWidth != $frameWidth)."
+        }
+        frameHeight != frameHeight && isFirstFrame -> {
+            "Height of first frame must be equal to height of APNG ($animationHeight != $frameHeight)."
+        }
+        frameWidth > animationWidth -> {
+            "Frame width must be inferior or equal at the animation width ($animationWidth < $frameWidth)."
+        }
+        frameHeight > animationHeight -> {
+            "Frame height must be inferior or equal at the animation height ($animationHeight < $frameHeight)."
+        }
+        else -> {
+            "Unknown problem"
+        }
+    }
+
+}

apng_library/src/main/java/oupson/apng/imageUtils/PngEncoder.kt

@@ -9,7 +9,6 @@ import java.util.zip.DeflaterOutputStream
 import kotlin.math.max
 import kotlin.math.min
 
-// TODO FIND A BETTER SOLUTION
 /**
  * Taken from http://catcode.com/pngencoder/com/keypoint/PngEncoder.java
  */

apng_library/src/main/java/oupson/apng/utils/Utils.kt

@@ -24,11 +24,10 @@ class Utils {
          * @param byteArray APNG
          * @return True if is an APNG
          */
-        // TODO OPTIMISE
+        @Deprecated("Will be removed with ApngAnimator and APNGDisassembler")
         fun isApng(byteArray: ByteArray): Boolean {
             if (!isPng(byteArray)) return false
             try {
-                val acTL = byteArrayOf(0x61, 0x63, 0x54, 0x4c)
                 for (i in 8 until byteArray.size) {
                     val it = byteArray.copyOfRange(i, i + 4)
                     // if byteArray contain acTL

app-test/src/main/res/layout/activity_creator.xml

@@ -18,6 +18,7 @@
             android:clickable="true"
             android:focusable="true"
             app:tint="#fff"
+            android:contentDescription="@string/add_frame"
             app:backgroundTint="@color/secondary"
             app:layout_anchor="@id/creatorBottomAppBar"
             app:layout_anchorGravity="bottom|right|end"

app-test/src/main/res/layout/activity_main.xml

@@ -23,6 +23,7 @@
                 android:layout_height="wrap_content"
                 android:src="@drawable/ic_create_white_24dp"
                 android:text="@string/create"
+                android:contentDescription="@string/create_animation"
                 app:tint="@android:color/white"
                 app:backgroundTint="@color/secondary"
                 app:layout_anchor="@id/bottomAppBar"

app-test/src/main/res/values/ids.xml

@@ -1,2 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources></resources>

app-test/src/main/res/values/strings.xml

@@ -17,6 +17,8 @@
     <string name="done">Done</string>
     <string name="clear">Clear</string>
     <string name="menu_first_frame_in_anim">First frame in animation</string>
+    <string name="add_frame">Add a frame to the animation</string>
+    <string name="create_animation">Create an animation</string>
 
     <string name="open">open</string>
     <string name="close">close</string>