Unhide BitmapRegionDecoder.
1. Rename LargeBitmap to BitmapRegionDecoder
2. Move the instantiations of BitmapRegionDecoder out of BitmapFactory.
3. Remove the use of MemoryFile in BitmapRegionDecoder, since MemoryFile's API had been modified in master. Otherwise, the change will break the master build.
4. Move AssetStreamAdaptor, AutoFDSeek and nullObjectReturn to Utils.h because BitmapFactory.cpp and BitmapRegionDecoder.cpp both need to use these utility functions.
Most of the modifications, except for (2) and (3), were reviewed in https://android-git.corp.google.com/g/#change,64716 .
However, that change broke the master build due to (3) and was reverted eventually.
So, instead of withdrawing this change and waiting for that change to be checked in again, I merge the two changes into one.
Change-Id: I2202c0fbbbd6d6676bbd9637e690023ea4099c40
diff --git a/core/jni/android/graphics/Utils.cpp b/core/jni/android/graphics/Utils.cpp
new file mode 100644
index 0000000..b6ead19
--- /dev/null
+++ b/core/jni/android/graphics/Utils.cpp
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Utils.h"
+#include "SkUtils.h"
+
+using namespace android;
+
+bool AssetStreamAdaptor::rewind() {
+ off_t pos = fAsset->seek(0, SEEK_SET);
+ if (pos == (off_t)-1) {
+ SkDebugf("----- fAsset->seek(rewind) failed\n");
+ return false;
+ }
+ return true;
+}
+
+size_t AssetStreamAdaptor::read(void* buffer, size_t size) {
+ ssize_t amount;
+
+ if (NULL == buffer) {
+ if (0 == size) { // caller is asking us for our total length
+ return fAsset->getLength();
+ }
+ // asset->seek returns new total offset
+ // we want to return amount that was skipped
+
+ off_t oldOffset = fAsset->seek(0, SEEK_CUR);
+ if (-1 == oldOffset) {
+ SkDebugf("---- fAsset->seek(oldOffset) failed\n");
+ return 0;
+ }
+ off_t newOffset = fAsset->seek(size, SEEK_CUR);
+ if (-1 == newOffset) {
+ SkDebugf("---- fAsset->seek(%d) failed\n", size);
+ return 0;
+ }
+ amount = newOffset - oldOffset;
+ } else {
+ amount = fAsset->read(buffer, size);
+ if (amount <= 0) {
+ SkDebugf("---- fAsset->read(%d) returned %d\n", size, amount);
+ }
+ }
+
+ if (amount < 0) {
+ amount = 0;
+ }
+ return amount;
+}
+
+jobject android::nullObjectReturn(const char msg[]) {
+ if (msg) {
+ SkDebugf("--- %s\n", msg);
+ }
+ return NULL;
+}