add (hidden) setHasAlpha() to allow clients like the view's cache to hint that a bitmap is opaque.

Knowing that a 32bit bitmap is opaque is a performance boost for some blits.

1 files changed, 6 insertions, 0 deletions

diff --git a/core/jni/android/graphics/Bitmap.cpp b/core/jni/android/graphics/Bitmap.cpp
index 8d52917..0f1b845 100644
--- a/core/jni/android/graphics/Bitmap.cpp
+++ b/core/jni/android/graphics/Bitmap.cpp
@@ -317,6 +317,11 @@ static jboolean Bitmap_hasAlpha(JNIEnv* env, jobject, SkBitmap* bitmap) {
     return !bitmap->isOpaque();

 }

 

+static void Bitmap_setHasAlpha(JNIEnv* env, jobject, SkBitmap* bitmap,

+                               jboolean hasAlpha) {

+    bitmap->setIsOpaque(!hasAlpha);

+}

+

 ///////////////////////////////////////////////////////////////////////////////

 

 static jobject Bitmap_createFromParcel(JNIEnv* env, jobject, jobject parcel) {

@@ -546,6 +551,7 @@ static JNINativeMethod gBitmapMethods[] = {
     {   "nativeRowBytes",           "(I)I", (void*)Bitmap_rowBytes },

     {   "nativeConfig",             "(I)I", (void*)Bitmap_config },

     {   "nativeHasAlpha",           "(I)Z", (void*)Bitmap_hasAlpha },

+    {   "nativeSetHasAlpha",        "(IZ)V", (void*)Bitmap_setHasAlpha },

     {   "nativeCreateFromParcel",

         "(Landroid/os/Parcel;)Landroid/graphics/Bitmap;",

         (void*)Bitmap_createFromParcel },