Ninepatch tweaks for better interop

Change-Id: I96781e2b27fcd6dd05d9726829e8e79ff365cbdc

2 files changed, 105 insertions, 0 deletions

diff --git a/core/jni/android/graphics/NinePatchPeeker.cpp b/core/jni/android/graphics/NinePatchPeeker.cpp
new file mode 100644
index 0000000..365d985
--- /dev/null
+++ b/core/jni/android/graphics/NinePatchPeeker.cpp
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2011 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 "NinePatchPeeker.h"
+
+#include "SkBitmap.h"
+
+using namespace android;
+
+bool NinePatchPeeker::peek(const char tag[], const void* data, size_t length) {
+    if (strcmp("npTc", tag) == 0 && length >= sizeof(Res_png_9patch)) {
+        Res_png_9patch* patch = (Res_png_9patch*) data;
+        size_t patchSize = patch->serializedSize();
+        assert(length == patchSize);
+        // You have to copy the data because it is owned by the png reader
+        Res_png_9patch* patchNew = (Res_png_9patch*) malloc(patchSize);
+        memcpy(patchNew, patch, patchSize);
+        // this relies on deserialization being done in place
+        Res_png_9patch::deserialize(patchNew);
+        patchNew->fileToDevice();
+        if (fPatchIsValid) {
+            free(fPatch);
+        }
+        fPatch = patchNew;
+        //printf("9patch: (%d,%d)-(%d,%d)\n",
+        //       fPatch.sizeLeft, fPatch.sizeTop,
+        //       fPatch.sizeRight, fPatch.sizeBottom);
+        fPatchIsValid = true;
+
+        // now update our host to force index or 32bit config
+        // 'cause we don't want 565 predithered, since as a 9patch, we know
+        // we will be stretched, and therefore we want to dither afterwards.
+        static const SkBitmap::Config gNo565Pref[] = {
+            SkBitmap::kIndex8_Config,
+            SkBitmap::kIndex8_Config,
+            SkBitmap::kARGB_8888_Config,
+            SkBitmap::kARGB_8888_Config,
+            SkBitmap::kARGB_8888_Config,
+            SkBitmap::kARGB_8888_Config,
+        };
+        fHost->setPrefConfigTable(gNo565Pref);
+    } else {
+        fPatch = NULL;
+    }
+    return true;    // keep on decoding
+}
diff --git a/core/jni/android/graphics/NinePatchPeeker.h b/core/jni/android/graphics/NinePatchPeeker.h
new file mode 100644
index 0000000..8567e23
--- /dev/null
+++ b/core/jni/android/graphics/NinePatchPeeker.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2011 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.
+ */
+
+#ifndef NinePatchPeeker_h
+#define NinePatchPeeker_h
+
+#include "SkImageDecoder.h"
+#include <utils/ResourceTypes.h>
+
+using namespace android;
+
+class NinePatchPeeker : public SkImageDecoder::Peeker {
+    SkImageDecoder* fHost;
+public:
+    NinePatchPeeker(SkImageDecoder* host) {
+        // the host lives longer than we do, so a raw ptr is safe
+        fHost = host;
+        fPatchIsValid = false;
+    }
+
+    ~NinePatchPeeker() {
+        if (fPatchIsValid) {
+            free(fPatch);
+        }
+    }
+
+    bool    fPatchIsValid;
+    Res_png_9patch*  fPatch;
+
+    virtual bool peek(const char tag[], const void* data, size_t length);
+};
+
+#endif // NinePatchPeeker_h