Android content shell bringup.

content/browser/android/jni_helper.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/android/jni_helper.h"
+
+#include <android/bitmap.h>
+#include <vector>
+
+#include "base/android/jni_android.h"
+#include "base/android/jni_helper.h"
+#include "base/android/jni_string.h"
+#include "base/debug/trace_event.h"
+#include "base/logging.h"
+#include "jni/jni_helper_jni.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+
+using base::android::AttachCurrentThread;
+using base::android::CheckException;
+using base::android::GetStaticMethodID;
+using base::android::GetClass;
+using base::android::GetMethodID;
+using base::android::ScopedJavaLocalRef;
+
+AutoLocalFrame::AutoLocalFrame(int capacity) {
+  AttachCurrentThread()->PushLocalFrame(capacity);
+}
+
+AutoLocalFrame::~AutoLocalFrame() {
+  AttachCurrentThread()->PopLocalFrame(NULL);
+}
+
+AutoLockJavaBitmap::AutoLockJavaBitmap(jobject bitmap) :
+    bitmap_(bitmap),
+    pixels_(NULL) {
+  int err = AndroidBitmap_lockPixels(AttachCurrentThread(), bitmap_, &pixels_);
+  DCHECK(!err);
+  DCHECK(pixels_);
+}
+
+AutoLockJavaBitmap::~AutoLockJavaBitmap() {
+  // TODO(aelias): Add AndroidBitmap_notifyPixelsChanged() call here
+  //               once it's added to the NDK.  Using hardware bitmaps will
+  //               be broken until this is fixed.
+  int err = AndroidBitmap_unlockPixels(AttachCurrentThread(), bitmap_);
+  DCHECK(!err);
+}
+
+gfx::Size AutoLockJavaBitmap::size() const {
+  AndroidBitmapInfo info;
+  int err = AndroidBitmap_getInfo(AttachCurrentThread(), bitmap_, &info);
+  DCHECK(!err);
+  return gfx::Size(info.width, info.height);
+}
+
+int AutoLockJavaBitmap::format() const {
+  AndroidBitmapInfo info;
+  int err = AndroidBitmap_getInfo(AttachCurrentThread(), bitmap_, &info);
+  DCHECK(!err);
+  return info.format;
+}
+
+uint32_t AutoLockJavaBitmap::stride() const {
+  AndroidBitmapInfo info;
+  int err = AndroidBitmap_getInfo(AttachCurrentThread(), bitmap_, &info);
+  DCHECK(!err);
+  return info.stride;
+}
+
+void PrintJavaStackTrace() {
+  JNIEnv* env = AttachCurrentThread();
+
+  ScopedJavaLocalRef<jclass> throwable_clazz =
+      GetClass(env, "java/lang/Throwable");
+  jmethodID throwable_constructor =
+      GetMethodID(env, throwable_clazz, "<init>", "()V");
+
+  ScopedJavaLocalRef<jobject> throwable_object(env,
+      env->NewObject(throwable_clazz.obj(), throwable_constructor));
+  DCHECK(!throwable_object.is_null());
+  jmethodID printstacktrace =
+      GetMethodID(env, throwable_clazz, "printStackTrace", "()V");
+
+  env->CallVoidMethod(throwable_object.obj(), printstacktrace);
+  CheckException(env);
+}
+
+void ConvertJavaArrayOfStringsToVectorOfStrings(
+    JNIEnv* env,
+    jobjectArray jstrings,
+    std::vector<std::string>* vec) {
+  vec->clear();
+  jsize length = env->GetArrayLength(jstrings);
+  for (jsize i = 0; i < length; ++i) {
+    jstring item = static_cast<jstring>(
+        env->GetObjectArrayElement(jstrings, i));
+    vec->push_back(base::android::ConvertJavaStringToUTF8(env, item));
+    env->DeleteLocalRef(item);
+  }
+}
+
+ScopedJavaLocalRef<jobject> CreateJavaBitmap(const gfx::Size& size, bool keep) {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> bitmap =
+      Java_JNIHelper_createJavaBitmap(env, size.width(), size.height(), keep);
+  CheckException(env);
+  return bitmap;
+}
+
+void DeleteJavaBitmap(jobject bitmap) {
+  JNIEnv* env = AttachCurrentThread();
+  Java_JNIHelper_deleteJavaBitmap(env, bitmap);
+  CheckException(env);
+}
+
+void PaintJavaBitmapToJavaBitmap(jobject source_bitmap,
+                                 const gfx::Rect& source_rect,
+                                 jobject dest_bitmap,
+                                 const gfx::Rect& dest_rect) {
+  TRACE_EVENT0("jni", "PaintJavaBitmapToJavaBitmap");
+  JNIEnv* env = AttachCurrentThread();
+
+  Java_JNIHelper_paintJavaBitmapToJavaBitmap(env,
+                                             source_bitmap,
+                                             source_rect.x(),
+                                             source_rect.y(),
+                                             source_rect.right(),
+                                             source_rect.bottom(),
+                                             dest_bitmap,
+                                             dest_rect.x(),
+                                             dest_rect.y(),
+                                             dest_rect.right(),
+                                             dest_rect.bottom());
+  CheckException(env);
+}
+
+ScopedJavaLocalRef<jobject> ConvertToJavaBitmap(const SkBitmap* skbitmap) {
+  TRACE_EVENT0("jni", "ConvertToJavaBitmap");
+  DCHECK(skbitmap);
+  DCHECK_EQ(skbitmap->bytesPerPixel(), 4);
+
+  // Create a temporary java bitmap.
+  ScopedJavaLocalRef<jobject> jbitmap =
+      CreateJavaBitmap(gfx::Size(skbitmap->width(), skbitmap->height()), false);
+
+  // Lock and copy the pixels from the skbitmap.
+  SkAutoLockPixels src_lock(*skbitmap);
+  AutoLockJavaBitmap dst_lock(jbitmap.obj());
+  void* src_pixels = skbitmap->getPixels();
+  void* dst_pixels = dst_lock.pixels();
+  memcpy(dst_pixels, src_pixels, skbitmap->getSize());
+
+  return jbitmap;
+}
+
+bool RegisterJniHelper(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}