Merge pull request #13 from cfogrady/TransparentBackground

Make background on characters and icons transparent.

app/src/main/java/com/github/nacabaro/vbhelper/components/CharacterEntry.kt

@@ -13,7 +13,9 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.FilterQuality
 import androidx.compose.ui.graphics.asImageBitmap
 import androidx.compose.ui.unit.dp
+import com.github.nacabaro.vbhelper.domain.Sprites
 import com.github.nacabaro.vbhelper.utils.BitmapData
+import com.github.nacabaro.vbhelper.utils.getBitmap
 import java.nio.ByteBuffer
 
 @Composable
@@ -23,9 +25,7 @@ fun CharacterEntry(
     onClick: () -> Unit = {  }
 ) {
     val bitmap = remember (icon.bitmap) {
-        Bitmap.createBitmap(icon.width, icon.height, Bitmap.Config.RGB_565).apply {
+        icon.getBitmap()
-            copyPixelsFromBuffer(ByteBuffer.wrap(icon.bitmap))
-        }
     }
     val imageBitmap = remember(bitmap) { bitmap.asImageBitmap() }
 

app/src/main/java/com/github/nacabaro/vbhelper/components/DexDimEntry.kt

@@ -17,6 +17,7 @@ import androidx.compose.ui.graphics.FilterQuality
 import androidx.compose.ui.graphics.asImageBitmap
 import androidx.compose.ui.unit.dp
 import com.github.nacabaro.vbhelper.utils.BitmapData
+import com.github.nacabaro.vbhelper.utils.getBitmap
 import java.nio.ByteBuffer
 
 @Composable
@@ -27,9 +28,7 @@ fun DexDiMEntry(
     modifier: Modifier = Modifier
 ) {
     val bitmap = remember (logo.bitmap) {
-        Bitmap.createBitmap(logo.width, logo.height, Bitmap.Config.RGB_565).apply {
+        logo.getBitmap()
-            copyPixelsFromBuffer(ByteBuffer.wrap(logo.bitmap))
-        }
     }
     val imageBitmap = remember(bitmap) { bitmap.asImageBitmap() }
 

app/src/main/java/com/github/nacabaro/vbhelper/utils/BitmapData.kt

@@ -1,8 +1,35 @@
 package com.github.nacabaro.vbhelper.utils
 
+import android.graphics.Bitmap
+import com.github.cfogrady.vb.dim.sprite.SpriteData
+
 // simple, but smooth
 data class BitmapData (
     val bitmap: ByteArray,
     val width: Int,
     val height: Int
-)
+)
+
+fun BitmapData.getBitmap(): Bitmap {
+    return Bitmap.createBitmap(createARGBIntArray(), this.width, this.height, Bitmap.Config.HARDWARE)
+}
+
+fun BitmapData.createARGBIntArray(): IntArray {
+    // hack to get it into correct format by relying on the DIM Sprites methods since we haven't changed the raw pixel data at this point.
+    val bytes = SpriteData.Sprite.builder().width(this.width).height(this.height).pixelData(this.bitmap).build()
+        .get24BitRGB()
+    val result = IntArray(this.width*this.height)
+    for(i in result.indices) {
+        val originalIndex = i*3
+        val red = bytes[originalIndex].toUInt() and 0xFFu
+        val green = bytes[originalIndex+1].toUInt() and 0xFFu
+        val blue = bytes[originalIndex+2].toUInt() and 0xFFu
+        val alpha = if(red == 0u && blue == 0u && green == 0xFFu) 0 else 0xFF
+        result[i] = (alpha shl 24) or (red shl 16).toInt() or (green shl 8).toInt() or blue.toInt()
+    }
+    return result
+}
+
+fun List<BitmapData>.getBitmaps(): List<Bitmap> {
+    return this.map{it.getBitmap()}
+}