Adding support for first frame not in animation

Fixing a bug

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

@@ -15,7 +15,6 @@ import java.util.zip.DeflaterOutputStream
 import kotlin.math.max
 import kotlin.math.min
 
-// TODO ADD SUPPORT FOR FIRST FRAME NOT IN ANIM
 // TODO OPTIMISE APNG
 /**
  * A class to write APNG.
@@ -90,6 +89,9 @@ class ExperimentalApngEncoder(
     /** Number of loop of the animation, zero to infinite **/
     private var repetitionCount: Int = 0
 
+    /** If the first frame should be included in the animation  **/
+    private var firstFrameInAnim: Boolean = true
+
     init {
         outputStream.write(Utils.pngSignature)
         writeHeader()
@@ -139,9 +141,9 @@ class ExperimentalApngEncoder(
     }
 
     /**
-     * Set the compression level
-     * @param compressionLevel A integer between 0 and 9 (not include)
-     * @return [ExperimentalApngEncoder] for chaining
+     * Set the compression level.
+     * @param compressionLevel A integer between 0 and 9 (not include).
+     * @return [ExperimentalApngEncoder] for chaining.
      */
     fun compressionLevel(compressionLevel: Int): ExperimentalApngEncoder {
         if (compressionLevel in 0..9) {
@@ -156,6 +158,16 @@ class ExperimentalApngEncoder(
         return this
     }
 
+    /**
+     * Set if the first frame should be included in the animation.
+     * @param firstFrameInAnim A boolean.
+     * @return [ExperimentalApngEncoder] for chaining.
+     */
+    fun firstFrameInAnim(firstFrameInAnim: Boolean): ExperimentalApngEncoder {
+        this.firstFrameInAnim = firstFrameInAnim
+        return this
+    }
+
     /**
      * Write a frame into the output stream.
      * @param inputStream An input stream that will be decoded in order to be written in the animation. Not freed.
@@ -221,9 +233,10 @@ class ExperimentalApngEncoder(
         else if (btm.height > height)
             throw InvalidFrameSizeException("Frame height must be inferior or equal at the animation height")
 
+        if (firstFrameInAnim || currentFrame != 0)
             writeFCTL(btm, delay, disposeOp, blendOp, xOffsets, yOffsets)
         writeImageData(btm)
-        currentSeq++
+        currentFrame++
     }
 
     /**

app-test/src/main/java/oupson/apngcreator/activities/CreatorActivity.kt

@@ -39,6 +39,7 @@ class CreatorActivity : AppCompatActivity() {
 
     private var items: ArrayList<Pair<Uri, Int>> = ArrayList()
     private var adapter: ImageAdapter? = null
+    private var firstFrameInAnim = true
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -84,6 +85,7 @@ class CreatorActivity : AppCompatActivity() {
 
     override fun onCreateOptionsMenu(menu: Menu?): Boolean {
         menuInflater.inflate(R.menu.creator_menu, menu)
+        menu?.findItem(R.id.menu_first_frame_in_anim)?.isChecked = true
         return true
     }
 
@@ -128,6 +130,7 @@ class CreatorActivity : AppCompatActivity() {
                             maxHeight,
                             items.size
                         ).compressionLevel(9)
+                            .firstFrameInAnim(firstFrameInAnim)
                         items.forEachIndexed { i, uri ->
                             if (BuildConfig.DEBUG)
                                 Log.v(TAG, "Encoding frame $i")
@@ -213,6 +216,8 @@ class CreatorActivity : AppCompatActivity() {
                             maxHeight,
                             items.size
                         ).compressionLevel(9)
+                            .firstFrameInAnim(firstFrameInAnim)
+
                         items.forEach { uri ->
                             println("delay : ${uri.second.toFloat()}ms")
                             val str = contentResolver.openInputStream(uri.first) ?: return@forEach
@@ -236,6 +241,7 @@ class CreatorActivity : AppCompatActivity() {
                                     )
                                 )
                                 type = "image/png"
+                                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
                             }
                             startActivity(
                                 Intent.createChooser(
@@ -285,6 +291,11 @@ class CreatorActivity : AppCompatActivity() {
                 adapter?.notifyDataSetChanged()
                 true
             }
+            R.id.menu_first_frame_in_anim -> {
+                item.isChecked = !item.isChecked
+                firstFrameInAnim = item.isChecked
+                true
+            }
             else -> if (item != null) super.onOptionsItemSelected(item) else true
         }
     }
@@ -333,6 +344,8 @@ class CreatorActivity : AppCompatActivity() {
                                 maxHeight,
                                 items.size
                             ).compressionLevel(9)
+                                .firstFrameInAnim(firstFrameInAnim)
+
                             items.forEach { uri ->
                                 // println("delay : ${adapter?.delay?.get(i)?.toFloat() ?: 1000f}ms")
                                 val str =

app-test/src/main/res/menu/creator_menu.xml

@@ -1,38 +1,43 @@
 <?xml version="1.0" encoding="utf-8"?>
-<menu xmlns:app="http://schemas.android.com/apk/res-auto"
-        xmlns:android="http://schemas.android.com/apk/res/android">
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto">
 
     <item
             android:id="@+id/menu_save_apng"
             android:icon="@drawable/ic_save_white_24dp"
             android:title="@string/save"
-            app:showAsAction="ifRoom"
-            app:iconTint="@color/control"/>
+            app:iconTint="@color/control"
+            app:showAsAction="ifRoom" />
 
     <item
             android:id="@+id/menu_create_apng"
             android:icon="@drawable/ic_play_arrow_white_24dp"
             android:title="@string/create"
-            app:showAsAction="ifRoom"
-            app:iconTint="@color/control"/>
+            app:iconTint="@color/control"
+            app:showAsAction="ifRoom" />
 
     <item
             android:id="@+id/menu_share_apng"
             android:icon="@drawable/ic_share_share_24dp"
             android:title="@string/share"
-            app:showAsAction="ifRoom"
-            app:iconTint="@color/control"/>
+            app:iconTint="@color/control"
+            app:showAsAction="ifRoom" />
 
     <item
             android:id="@+id/menu_set_all_duration"
             android:icon="@drawable/ic_access_time_white_24dp"
             android:title="@string/set_all_duration"
-            app:showAsAction="ifRoom"
-            app:iconTint="@color/control"/>
+            app:iconTint="@color/control"
+            app:showAsAction="ifRoom" />
 
     <item
             android:id="@+id/menu_clear"
             android:title="@string/clear"
-        app:showAsAction="never"
-        app:iconTint="@color/control" />
+            app:iconTint="@color/control"
+            app:showAsAction="never" />
+    <item
+            android:id="@+id/menu_first_frame_in_anim"
+            android:checkable="true"
+            android:title="@string/menu_first_frame_in_anim"
+            app:showAsAction="never|withText" />
 </menu>

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

@@ -16,6 +16,7 @@
     <string name="set_all_duration">Set duration of all frames</string>
     <string name="done">Done</string>
     <string name="clear">Clear</string>
+    <string name="menu_first_frame_in_anim">First frame in animation</string>
 
     <string name="open">open</string>
     <string name="close">close</string>