1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef UI_GFX_ANDROID_JAVA_BITMAP_H_
6#define UI_GFX_ANDROID_JAVA_BITMAP_H_
7
8#include <jni.h>
9
10#include "base/android/scoped_java_ref.h"
11#include "third_party/skia/include/core/SkBitmap.h"
12#include "ui/gfx/size.h"
13
14namespace gfx {
15
16// A Java counterpart will be generated for this enum.
17// GENERATED_JAVA_ENUM_PACKAGE: org.chromium.ui.gfx
18enum BitmapFormat {
19  BITMAP_FORMAT_NO_CONFIG,
20  BITMAP_FORMAT_ALPHA_8,
21  BITMAP_FORMAT_ARGB_4444,
22  BITMAP_FORMAT_ARGB_8888,
23  BITMAP_FORMAT_RGB_565,
24};
25
26// This class wraps a JNI AndroidBitmap object to make it easier to use. It
27// handles locking and unlocking of the underlying pixels, along with wrapping
28// various JNI methods.
29class GFX_EXPORT JavaBitmap {
30 public:
31  explicit JavaBitmap(jobject bitmap);
32  ~JavaBitmap();
33
34  inline void* pixels() { return pixels_; }
35  inline const void* pixels() const { return pixels_; }
36  inline const gfx::Size& size() const { return size_; }
37  // Formats are in android/bitmap.h; e.g. ANDROID_BITMAP_FORMAT_RGBA_8888
38  inline int format() const { return format_; }
39  inline uint32_t stride() const { return stride_; }
40
41  // Registers methods with JNI and returns true if succeeded.
42  static bool RegisterJavaBitmap(JNIEnv* env);
43
44 private:
45  jobject bitmap_;
46  void* pixels_;
47  gfx::Size size_;
48  int format_;
49  uint32_t stride_;
50
51  DISALLOW_COPY_AND_ASSIGN(JavaBitmap);
52};
53
54// Allocates a Java-backed bitmap (android.graphics.Bitmap) with the given
55// (non-empty!) size and color type.
56GFX_EXPORT base::android::ScopedJavaLocalRef<jobject> CreateJavaBitmap(
57    int width,
58    int height,
59    SkColorType color_type);
60
61// Loads an SkBitmap from the provided drawable resource identifier (e.g.,
62// android:drawable/overscroll_glow). If the resource loads successfully, it
63// will be integrally scaled down, preserving aspect ratio, to a size no smaller
64// than |size|. Otherwise, an empty bitmap is returned.
65GFX_EXPORT SkBitmap
66    CreateSkBitmapFromAndroidResource(const char* name, gfx::Size size);
67
68// Converts |skbitmap| to a Java-backed bitmap (android.graphics.Bitmap).
69// Note: |skbitmap| is assumed to be non-null, non-empty and one of RGBA_8888 or
70// RGB_565 formats.
71GFX_EXPORT base::android::ScopedJavaLocalRef<jobject> ConvertToJavaBitmap(
72    const SkBitmap* skbitmap);
73
74// Converts |bitmap| to an SkBitmap of the same size and format.
75// Note: |jbitmap| is assumed to be non-null, non-empty and of format RGBA_8888.
76GFX_EXPORT SkBitmap CreateSkBitmapFromJavaBitmap(const JavaBitmap& jbitmap);
77
78// Returns a Skia color type value for the requested input java Bitmap.Config.
79GFX_EXPORT SkColorType ConvertToSkiaColorType(jobject jbitmap_config);
80
81}  // namespace gfx
82
83#endif  // UI_GFX_ANDROID_JAVA_BITMAP_H_
84