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 "third_party/skia/include/core/SkBitmap.h"
  12 #include "ui/gfx/size.h"
  13
  14 namespace gfx {
  15
  16 // Define Bitmap Config values like BITMAP_CONFIG_ARGB_8888 in a
  17 // way that ensures they're always the same than their Java counterpart.
  18
  19 enum BitmapConfig {
  20 #define DEFINE_BITMAP_CONFIG(x, y) BITMAP_##x = y,
  21 #include "bitmap_config_list.h"
  22 #undef DEFINE_BITMAP_CONFIG
  23 };
  24
  25 // This class wraps a JNI AndroidBitmap object to make it easier to use. It
  26 // handles locking and unlocking of the underlying pixels, along with wrapping
  27 // various JNI methods.
  28 class GFX_EXPORT JavaBitmap {
  29  public:
  30   explicit JavaBitmap(jobject bitmap);
  31   ~JavaBitmap();
  32
  33   inline void* pixels() { return pixels_; }
  34   inline const void* pixels() const { return pixels_; }
  35   inline const gfx::Size& size() const { return size_; }
  36   // Formats are in android/bitmap.h; e.g. ANDROID_BITMAP_FORMAT_RGBA_8888
  37   inline int format() const { return format_; }
  38   inline uint32_t stride() const { return stride_; }
  39
  40   // Registers methods with JNI and returns true if succeeded.
  41   static bool RegisterJavaBitmap(JNIEnv* env);
  42
  43  private:
  44   jobject bitmap_;
  45   void* pixels_;
  46   gfx::Size size_;
  47   int format_;
  48   uint32_t stride_;
  49
  50   DISALLOW_COPY_AND_ASSIGN(JavaBitmap);
  51 };
  52
  53 // Allocates a Java-backed bitmap (android.graphics.Bitmap) with the given
  54 // (non-empty!) size and color type.
  55 GFX_EXPORT base::android::ScopedJavaLocalRef<jobject> CreateJavaBitmap(
  56     int width,
  57     int height,
  58     SkColorType color_type);
  59
  60 // Loads an SkBitmap from the provided drawable resource identifier (e.g.,
  61 // android:drawable/overscroll_glow). If the resource loads successfully, it
  62 // will be integrally scaled down, preserving aspect ratio, to a size no smaller
  63 // than |size|. Otherwise, an empty bitmap is returned.
  64 GFX_EXPORT SkBitmap
  65     CreateSkBitmapFromAndroidResource(const char* name, gfx::Size size);
  66
  67 // Converts |skbitmap| to a Java-backed bitmap (android.graphics.Bitmap).
  68 // Note: |skbitmap| is assumed to be non-null, non-empty and one of RGBA_8888 or
  69 // RGB_565 formats.
  70 GFX_EXPORT base::android::ScopedJavaLocalRef<jobject> ConvertToJavaBitmap(
  71     const SkBitmap* skbitmap);
  72
  73 // Converts |bitmap| to an SkBitmap of the same size and format.
  74 // Note: |jbitmap| is assumed to be non-null, non-empty and of format RGBA_8888.
  75 GFX_EXPORT SkBitmap CreateSkBitmapFromJavaBitmap(const JavaBitmap& jbitmap);
  76
  77 // Returns a Skia color type value for the requested input java Bitmap.Config.
  78 GFX_EXPORT SkColorType ConvertToSkiaColorType(jobject jbitmap_config);
  79
  80 }  // namespace gfx
  81
  82 #endif  // UI_GFX_ANDROID_JAVA_BITMAP_H_