ui/gfx/android/java_bitmap.cc

   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 #include "ui/gfx/android/java_bitmap.h"
   6
   7 #include <android/bitmap.h>
   8
   9 #include "base/logging.h"
  10 #include "jni/BitmapHelper_jni.h"
  11 #include "third_party/skia/include/core/SkBitmap.h"
  12 #include "ui/gfx/size.h"
  13
  14 using base::android::AttachCurrentThread;
  15
  16 namespace gfx {
  17
  18 JavaBitmap::JavaBitmap(jobject bitmap)
  19     : bitmap_(bitmap),
  20       pixels_(NULL) {
  21   int err = AndroidBitmap_lockPixels(AttachCurrentThread(), bitmap_, &pixels_);
  22   DCHECK(!err);
  23   DCHECK(pixels_);
  24
  25   AndroidBitmapInfo info;
  26   err = AndroidBitmap_getInfo(AttachCurrentThread(), bitmap_, &info);
  27   DCHECK(!err);
  28   size_ = gfx::Size(info.width, info.height);
  29   format_ = info.format;
  30   stride_ = info.stride;
  31 }
  32
  33 JavaBitmap::~JavaBitmap() {
  34   int err = AndroidBitmap_unlockPixels(AttachCurrentThread(), bitmap_);
  35   DCHECK(!err);
  36 }
  37
  38 // static
  39 bool JavaBitmap::RegisterJavaBitmap(JNIEnv* env) {
  40   return ui::RegisterNativesImpl(env);
  41 }
  42
  43 ScopedJavaLocalRef<jobject> CreateJavaBitmap(const gfx::Size& size) {
  44   return ui::Java_BitmapHelper_createBitmap(AttachCurrentThread(),
  45       size.width(), size.height());
  46 }
  47
  48 ScopedJavaLocalRef<jobject> ConvertToJavaBitmap(const SkBitmap* skbitmap) {
  49   DCHECK(skbitmap);
  50   DCHECK_EQ(skbitmap->bytesPerPixel(), 4);
  51
  52   ScopedJavaLocalRef<jobject> jbitmap =
  53       CreateJavaBitmap(gfx::Size(skbitmap->width(), skbitmap->height()));
  54   SkAutoLockPixels src_lock(*skbitmap);
  55   JavaBitmap dst_lock(jbitmap.obj());
  56   void* src_pixels = skbitmap->getPixels();
  57   void* dst_pixels = dst_lock.pixels();
  58   memcpy(dst_pixels, src_pixels, skbitmap->getSize());
  59
  60   return jbitmap;
  61 }
  62
  63 static ScopedJavaLocalRef<jobject> CreateJavaBitmapFromResource(
  64     const char* name) {
  65   JNIEnv* env = AttachCurrentThread();
  66   ScopedJavaLocalRef<jstring> jname(env, env->NewStringUTF(name));
  67   return ui::Java_BitmapHelper_decodeDrawableResource(env, jname.obj());
  68 }
  69
  70 static SkBitmap ConvertToSkBitmap(ScopedJavaLocalRef<jobject> jbitmap) {
  71   JavaBitmap src_lock(jbitmap.obj());
  72   DCHECK_EQ(src_lock.format(), ANDROID_BITMAP_FORMAT_RGBA_8888);
  73
  74   gfx::Size src_size = src_lock.size();
  75
  76   SkBitmap skbitmap;
  77   skbitmap.setConfig(SkBitmap::kARGB_8888_Config,
  78       src_size.width(), src_size.height(), src_lock.stride());
  79   skbitmap.allocPixels();
  80   SkAutoLockPixels dst_lock(skbitmap);
  81
  82   void* src_pixels = src_lock.pixels();
  83   void* dst_pixels = skbitmap.getPixels();
  84
  85   memcpy(dst_pixels, src_pixels, skbitmap.getSize());
  86
  87   return skbitmap;
  88 }
  89
  90 SkBitmap CreateSkBitmapFromResource(const char* name) {
  91   return ConvertToSkBitmap(CreateJavaBitmapFromResource(name));
  92 }
  93
  94 }  //  namespace gfx