ui/gfx/android/java_bitmap.h

   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 "ui/gfx/size.h"
  12
  13 class SkBitmap;
  14
  15 namespace gfx {
  16
  17 // This class wraps a JNI AndroidBitmap object to make it easier to use. It
  18 // handles locking and unlocking of the underlying pixels, along with wrapping
  19 // various JNI methods.
  20 class GFX_EXPORT JavaBitmap {
  21  public:
  22   explicit JavaBitmap(jobject bitmap);
  23   ~JavaBitmap();
  24
  25   inline void* pixels() { return pixels_; }
  26   inline const gfx::Size& size() const { return size_; }
  27   // Formats are in android/bitmap.h; e.g. ANDROID_BITMAP_FORMAT_RGBA_8888
  28   inline int format() const { return format_; }
  29   inline uint32_t stride() const { return stride_; }
  30
  31   // Registers methods with JNI and returns true if succeeded.
  32   static bool RegisterJavaBitmap(JNIEnv* env);
  33
  34  private:
  35   jobject bitmap_;
  36   void* pixels_;
  37   gfx::Size size_;
  38   int format_;
  39   uint32_t stride_;
  40
  41   DISALLOW_COPY_AND_ASSIGN(JavaBitmap);
  42 };
  43
  44 GFX_EXPORT base::android::ScopedJavaLocalRef<jobject> ConvertToJavaBitmap(
  45     const SkBitmap* skbitmap);
  46
  47 GFX_EXPORT SkBitmap CreateSkBitmapFromJavaBitmap(JavaBitmap& jbitmap);
  48
  49 // If the resource loads successfully, it will be resized to |size|.
  50 // Note: If the source resource is smaller than |size|, quality may suffer.
  51 GFX_EXPORT SkBitmap CreateSkBitmapFromResource(const char* name,
  52                                                gfx::Size size);
  53
  54 }  // namespace gfx
  55
  56 #endif  // UI_GFX_ANDROID_JAVA_BITMAP_H_