1 files changed, 93 insertions, 0 deletions
diff --git a/libs/hwui/jni/NinePatchPeeker.cpp b/libs/hwui/jni/NinePatchPeeker.cpp
new file mode 100644
index 000000000000..9171fc687276
--- /dev/null
+++ b/libs/hwui/jni/NinePatchPeeker.cpp
@@ -0,0 +1,93 @@
+/*
+ * 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>
+#include <cutils/compiler.h>
+
+using namespace android;
+
+bool NinePatchPeeker::readChunk(const char tag[], const void* data, size_t length) {
+    if (!strcmp("npTc", tag) && length >= sizeof(Res_png_9patch)) {
+        Res_png_9patch* patch = (Res_png_9patch*) data;
+        size_t patchSize = patch->serializedSize();
+        if (length != patchSize) {
+            return false;
+        }
+        // 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);
+        Res_png_9patch::deserialize(patchNew);
+        patchNew->fileToDevice();
+        free(mPatch);
+        mPatch = patchNew;
+        mPatchSize = patchSize;
+    } else if (!strcmp("npLb", tag) && length == sizeof(int32_t) * 4) {
+        mHasInsets = true;
+        memcpy(&mOpticalInsets, data, sizeof(int32_t) * 4);
+    } else if (!strcmp("npOl", tag) && length == 24) { // 4 int32_ts, 1 float, 1 int32_t sized byte
+        mHasInsets = true;
+        memcpy(&mOutlineInsets, data, sizeof(int32_t) * 4);
+        mOutlineRadius = ((const float*)data)[4];
+        mOutlineAlpha = ((const int32_t*)data)[5] & 0xff;
+    }
+    return true;    // keep on decoding
+}
+
+static void scaleDivRange(int32_t* divs, int count, float scale, int maxValue) {
+    for (int i = 0; i < count; i++) {
+        divs[i] = int32_t(divs[i] * scale + 0.5f);
+        if (i > 0 && divs[i] == divs[i - 1]) {
+            divs[i]++; // avoid collisions
+        }
+    }
+
+    if (CC_UNLIKELY(divs[count - 1] > maxValue)) {
+        // if the collision avoidance above put some divs outside the bounds of the bitmap,
+        // slide outer stretchable divs inward to stay within bounds
+        int highestAvailable = maxValue;
+        for (int i = count - 1; i >= 0; i--) {
+            divs[i] = highestAvailable;
+            if (i > 0 && divs[i] <= divs[i-1]) {
+                // keep shifting
+                highestAvailable = divs[i] - 1;
+            } else {
+                break;
+            }
+        }
+    }
+}
+
+void NinePatchPeeker::scale(float scaleX, float scaleY, int scaledWidth, int scaledHeight) {
+    if (!mPatch) {
+        return;
+    }
+
+    // The max value for the divRange is one pixel less than the actual max to ensure that the size
+    // of the last div is not zero. A div of size 0 is considered invalid input and will not render.
+    if (!SkScalarNearlyEqual(scaleX, 1.0f)) {
+        mPatch->paddingLeft   = int(mPatch->paddingLeft   * scaleX + 0.5f);
+        mPatch->paddingRight  = int(mPatch->paddingRight  * scaleX + 0.5f);
+        scaleDivRange(mPatch->getXDivs(), mPatch->numXDivs, scaleX, scaledWidth - 1);
+    }
+
+    if (!SkScalarNearlyEqual(scaleY, 1.0f)) {
+        mPatch->paddingTop    = int(mPatch->paddingTop    * scaleY + 0.5f);
+        mPatch->paddingBottom = int(mPatch->paddingBottom * scaleY + 0.5f);
+        scaleDivRange(mPatch->getYDivs(), mPatch->numYDivs, scaleY, scaledHeight - 1);
+    }
+}