From 22078f2c05281763726d152f62b59f7cce96c73e Mon Sep 17 00:00:00 2001
From: Mike Reed <reed@google.com>
Date: Fri, 4 Dec 2009 09:37:08 -0500
Subject: [PATCH] NDK header for accessing pixels of a java bitmap

---
 include/android/bitmap.h | 79 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 include/android/bitmap.h

diff --git a/include/android/bitmap.h b/include/android/bitmap.h
new file mode 100644
index 000000000..5078277b5
--- /dev/null
+++ b/include/android/bitmap.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2009 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 ANDROID_BITMAP_H
+#define ANDROID_BITMAP_H
+
+#include <stdint.h>
+#include <jni.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define ANDROID_BITMAP_RESUT_SUCCESS            0
+#define ANDROID_BITMAP_RESULT_BAD_PARAMETER     -1
+#define ANDROID_BITMAP_RESULT_JNI_EXCEPTION     -2
+#define ANDROID_BITMAP_RESULT_ALLOCATION_FAILED -3
+
+enum AndroidBitmapFormat {
+    ANDROID_BITMAP_FORMAT_NONE      = 0,
+    ANDROID_BITMAP_FORMAT_RGBA_8888 = 1,
+    ANDROID_BITMAP_FORMAT_RGB_565   = 4,
+    ANDROID_BITMAP_FORMAT_RGBA_4444 = 7,
+    ANDROID_BITMAP_FORMAT_A_8       = 8,
+};
+
+typedef struct {
+    uint32_t    width;
+    uint32_t    height;
+    uint32_t    stride;
+    int32_t     format;
+    uint32_t    flags;      // 0 for now
+} AndroidBitmapInfo;
+
+/**
+ * Given a java bitmap object, fill out the AndroidBitmap struct for it.
+ * If the call fails, the info parameter will be ignored
+ */
+int AndroidBitmap_getInfo(JNIEnv* env, jobject jbitmap,
+                          AndroidBitmapInfo* info);
+
+/**
+ * Given a java bitmap object, attempt to lock the pixel address.
+ * Locking will ensure that the memory for the pixels will not move
+ * until the unlockPixels call, and ensure that, if the pixels had been
+ * previously purged, they will have been restored.
+ *
+ * If this call succeeds, it must be balanced by a call to
+ * AndroidBitmap_unlockPixels, after which time the address of the pixels should
+ * no longer be used.
+ *
+ * If this succeeds, *addrPtr will be set to the pixel address. If the call
+ * fails, addrPtr will be ignored.
+ */
+int AndroidBitmap_lockPixels(JNIEnv* env, jobject jbitmap, void** addrPtr);
+
+/**
+ * Call this to balanace a successful call to AndroidBitmap_lockPixels
+ */
+int AndroidBitmap_unlockPixels(JNIEnv* env, jobject jbitmap);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif