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/android/jni_string.h"
10 #include "base/logging.h"
11 #include "jni/BitmapHelper_jni.h"
12 #include "skia/ext/image_operations.h"
13 #include "third_party/skia/include/core/SkBitmap.h"
14 #include "ui/gfx/size.h"
15
16 using base::android::AttachCurrentThread;
17
18 namespace gfx {
19
JavaBitmap(jobject bitmap)20 JavaBitmap::JavaBitmap(jobject bitmap)
21 : bitmap_(bitmap),
22 pixels_(NULL) {
23 int err = AndroidBitmap_lockPixels(AttachCurrentThread(), bitmap_, &pixels_);
24 DCHECK(!err);
25 DCHECK(pixels_);
26
27 AndroidBitmapInfo info;
28 err = AndroidBitmap_getInfo(AttachCurrentThread(), bitmap_, &info);
29 DCHECK(!err);
30 size_ = gfx::Size(info.width, info.height);
31 format_ = info.format;
32 stride_ = info.stride;
33 }
34
~JavaBitmap()35 JavaBitmap::~JavaBitmap() {
36 int err = AndroidBitmap_unlockPixels(AttachCurrentThread(), bitmap_);
37 DCHECK(!err);
38 }
39
40 // static
RegisterJavaBitmap(JNIEnv * env)41 bool JavaBitmap::RegisterJavaBitmap(JNIEnv* env) {
42 return RegisterNativesImpl(env);
43 }
44
CreateJavaBitmap(const gfx::Size & size)45 static ScopedJavaLocalRef<jobject> CreateJavaBitmap(const gfx::Size& size) {
46 return Java_BitmapHelper_createBitmap(AttachCurrentThread(),
47 size.width(), size.height());
48 }
49
ConvertToJavaBitmap(const SkBitmap * skbitmap)50 ScopedJavaLocalRef<jobject> ConvertToJavaBitmap(const SkBitmap* skbitmap) {
51 DCHECK(skbitmap);
52 DCHECK_EQ(skbitmap->bytesPerPixel(), 4);
53
54 ScopedJavaLocalRef<jobject> jbitmap =
55 CreateJavaBitmap(gfx::Size(skbitmap->width(), skbitmap->height()));
56 SkAutoLockPixels src_lock(*skbitmap);
57 JavaBitmap dst_lock(jbitmap.obj());
58 void* src_pixels = skbitmap->getPixels();
59 void* dst_pixels = dst_lock.pixels();
60 memcpy(dst_pixels, src_pixels, skbitmap->getSize());
61
62 return jbitmap;
63 }
64
CreateSkBitmapFromJavaBitmap(JavaBitmap & jbitmap)65 SkBitmap CreateSkBitmapFromJavaBitmap(JavaBitmap& jbitmap) {
66 DCHECK_EQ(jbitmap.format(), ANDROID_BITMAP_FORMAT_RGBA_8888);
67
68 gfx::Size src_size = jbitmap.size();
69
70 SkBitmap skbitmap;
71 skbitmap.setConfig(SkBitmap::kARGB_8888_Config,
72 src_size.width(),
73 src_size.height(),
74 jbitmap.stride());
75 skbitmap.allocPixels();
76 SkAutoLockPixels dst_lock(skbitmap);
77
78 void* src_pixels = jbitmap.pixels();
79 void* dst_pixels = skbitmap.getPixels();
80
81 memcpy(dst_pixels, src_pixels, skbitmap.getSize());
82
83 return skbitmap;
84 }
85
CreateSkBitmapFromResource(const char * name,gfx::Size size)86 SkBitmap CreateSkBitmapFromResource(const char* name, gfx::Size size) {
87 DCHECK(!size.IsEmpty());
88 JNIEnv* env = AttachCurrentThread();
89 ScopedJavaLocalRef<jstring> jname(env, env->NewStringUTF(name));
90 ScopedJavaLocalRef<jobject> jobj(Java_BitmapHelper_decodeDrawableResource(
91 env, jname.obj(), size.width(), size.height()));
92 if (jobj.is_null())
93 return SkBitmap();
94
95 JavaBitmap jbitmap(jobj.obj());
96 SkBitmap bitmap = CreateSkBitmapFromJavaBitmap(jbitmap);
97 return skia::ImageOperations::Resize(
98 bitmap, skia::ImageOperations::RESIZE_BOX, size.width(), size.height());
99 }
100
101 } // namespace gfx
102