HardwareBitmaps: support createBitmap methods that return immutable bitmap

Test: testCreateScaledBitmap, testCreateTransformedBitmap, testCreateSubsetBitmap in HardwareBitmapTests
bug:30999911
Change-Id: Ic128dfed78b18ad6f12dad50023ee7c2f5bfa4ad

core/jni/android/graphics/Bitmap.cpp

@@ -1291,6 +1291,23 @@ static jint Bitmap_getAllocationByteCount(JNIEnv* env, jobject, jlong bitmapPtr)
     return static_cast<jint>(bitmapHandle->getAllocationByteCount());
 }
 
+static jobject Bitmap_nativeCopyPreserveInternalConfig(JNIEnv* env, jobject, jlong bitmapPtr) {
+    LocalScopedBitmap bitmapHandle(bitmapPtr);
+    LOG_ALWAYS_FATAL_IF(!bitmapHandle->isHardware(),
+            "Hardware config is only supported config in Bitmap_nativeCopyPreserveInternalConfig");
+    Bitmap& hwuiBitmap = bitmapHandle->bitmap();
+    SkBitmap src;
+    hwuiBitmap.getSkBitmap(&src);
+
+    SkBitmap result;
+    HeapAllocator allocator;
+    if (!src.copyTo(&result, hwuiBitmap.info().colorType(), &allocator)) {
+        doThrowRE(env, "Could not copy a hardware bitmap.");
+        return NULL;
+    }
+    return createBitmap(env, allocator.getStorageObjAndReset(), kBitmapCreateFlag_None);
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 static jclass make_globalref(JNIEnv* env, const char classname[])
 {
@@ -1349,6 +1366,8 @@ static const JNINativeMethod gBitmapMethods[] = {
     {   "nativeSameAs",             "(JJ)Z", (void*)Bitmap_sameAs },
     {   "nativePrepareToDraw",      "(J)V", (void*)Bitmap_prepareToDraw },
     {   "nativeGetAllocationByteCount", "(J)I", (void*)Bitmap_getAllocationByteCount },
+    {   "nativeCopyPreserveInternalConfig", "(J)Landroid/graphics/Bitmap;",
+        (void*)Bitmap_nativeCopyPreserveInternalConfig },
 };
 
 int register_android_graphics_Bitmap(JNIEnv* env)

graphics/java/android/graphics/Bitmap.java

@@ -753,6 +753,11 @@ public final class Bitmap implements Parcelable {
             return source;
         }
 
+        boolean isHardware = source.getConfig() == Config.HARDWARE;
+        if (isHardware) {
+            source = nativeCopyPreserveInternalConfig(source.mNativePtr);
+        }
+
         int neww = width;
         int newh = height;
         Canvas canvas = new Canvas();
@@ -824,7 +829,9 @@ public final class Bitmap implements Parcelable {
         canvas.setBitmap(bitmap);
         canvas.drawBitmap(source, srcR, dstR, paint);
         canvas.setBitmap(null);
-
+        if (isHardware) {
+            return bitmap.copy(Config.HARDWARE, false);
+        }
         return bitmap;
     }
 
@@ -1773,4 +1780,5 @@ public final class Bitmap implements Parcelable {
     private static native boolean nativeSameAs(long nativeBitmap0, long nativeBitmap1);
     private static native void nativePrepareToDraw(long nativeBitmap);
     private static native int nativeGetAllocationByteCount(long nativeBitmap);
+    private static native Bitmap nativeCopyPreserveInternalConfig(long nativeBitmap);
 }