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/android/jni_string.h"
  10 #include "base/logging.h"
  11 #include "jni/BitmapHelper_jni.h"
  12 #include "ui/gfx/geometry/size.h"
  13
  14 using base::android::AttachCurrentThread;
  15 using base::android::ConvertUTF8ToJavaString;
  16
  17 namespace gfx {
  18
  19 JavaBitmap::JavaBitmap(jobject bitmap)
  20     : bitmap_(bitmap),
  21       pixels_(NULL) {
  22   int err = AndroidBitmap_lockPixels(AttachCurrentThread(), bitmap_, &pixels_);
  23   DCHECK(!err);
  24   DCHECK(pixels_);
  25
  26   AndroidBitmapInfo info;
  27   err = AndroidBitmap_getInfo(AttachCurrentThread(), bitmap_, &info);
  28   DCHECK(!err);
  29   size_ = gfx::Size(info.width, info.height);
  30   format_ = info.format;
  31   stride_ = info.stride;
  32 }
  33
  34 JavaBitmap::~JavaBitmap() {
  35   int err = AndroidBitmap_unlockPixels(AttachCurrentThread(), bitmap_);
  36   DCHECK(!err);
  37 }
  38
  39 // static
  40 bool JavaBitmap::RegisterJavaBitmap(JNIEnv* env) {
  41   return RegisterNativesImpl(env);
  42 }
  43
  44 static int SkColorTypeToBitmapFormat(SkColorType color_type) {
  45   switch (color_type) {
  46     case kAlpha_8_SkColorType:
  47       return BITMAP_FORMAT_ALPHA_8;
  48     case kARGB_4444_SkColorType:
  49       return BITMAP_FORMAT_ARGB_4444;
  50     case kN32_SkColorType:
  51       return BITMAP_FORMAT_ARGB_8888;
  52     case kRGB_565_SkColorType:
  53       return BITMAP_FORMAT_RGB_565;
  54     case kUnknown_SkColorType:
  55     default:
  56       NOTREACHED();
  57       return BITMAP_FORMAT_NO_CONFIG;
  58   }
  59 }
  60
  61 ScopedJavaLocalRef<jobject> CreateJavaBitmap(int width,
  62                                              int height,
  63                                              SkColorType color_type) {
  64   DCHECK_GT(width, 0);
  65   DCHECK_GT(height, 0);
  66   int java_bitmap_config = SkColorTypeToBitmapFormat(color_type);
  67   return Java_BitmapHelper_createBitmap(
  68       AttachCurrentThread(), width, height, java_bitmap_config);
  69 }
  70
  71 ScopedJavaLocalRef<jobject> ConvertToJavaBitmap(const SkBitmap* skbitmap) {
  72   DCHECK(skbitmap);
  73   DCHECK(!skbitmap->isNull());
  74   SkColorType color_type = skbitmap->colorType();
  75   DCHECK((color_type == kRGB_565_SkColorType) ||
  76          (color_type == kN32_SkColorType));
  77   ScopedJavaLocalRef<jobject> jbitmap = CreateJavaBitmap(
  78       skbitmap->width(), skbitmap->height(), color_type);
  79   SkAutoLockPixels src_lock(*skbitmap);
  80   JavaBitmap dst_lock(jbitmap.obj());
  81   void* src_pixels = skbitmap->getPixels();
  82   void* dst_pixels = dst_lock.pixels();
  83   memcpy(dst_pixels, src_pixels, skbitmap->getSize());
  84
  85   return jbitmap;
  86 }
  87
  88 SkBitmap CreateSkBitmapFromJavaBitmap(const JavaBitmap& jbitmap) {
  89   DCHECK(!jbitmap.size().IsEmpty());
  90   DCHECK_GT(jbitmap.stride(), 0U);
  91   DCHECK(jbitmap.pixels());
  92
  93   gfx::Size src_size = jbitmap.size();
  94
  95   SkBitmap skbitmap;
  96   switch (jbitmap.format()) {
  97     case ANDROID_BITMAP_FORMAT_RGBA_8888:
  98       skbitmap.allocPixels(SkImageInfo::MakeN32Premul(src_size.width(),
  99                                                       src_size.height()),
 100                            jbitmap.stride());
 101       break;
 102     case ANDROID_BITMAP_FORMAT_A_8:
 103       skbitmap.allocPixels(SkImageInfo::MakeA8(src_size.width(),
 104                                                src_size.height()),
 105                            jbitmap.stride());
 106       break;
 107     default:
 108       CHECK(false) << "Invalid Java bitmap format: " << jbitmap.format();
 109       break;
 110   }
 111   const void* src_pixels = jbitmap.pixels();
 112   void* dst_pixels = skbitmap.getPixels();
 113   memcpy(dst_pixels, src_pixels, skbitmap.getSize());
 114
 115   return skbitmap;
 116 }
 117
 118 SkColorType ConvertToSkiaColorType(jobject bitmap_config) {
 119   int jbitmap_config = Java_BitmapHelper_getBitmapFormatForConfig(
 120       AttachCurrentThread(), bitmap_config);
 121   switch (jbitmap_config) {
 122     case BITMAP_FORMAT_ALPHA_8:
 123       return kAlpha_8_SkColorType;
 124     case BITMAP_FORMAT_ARGB_4444:
 125       return kARGB_4444_SkColorType;
 126     case BITMAP_FORMAT_ARGB_8888:
 127       return kN32_SkColorType;
 128     case BITMAP_FORMAT_RGB_565:
 129       return kRGB_565_SkColorType;
 130     case BITMAP_FORMAT_NO_CONFIG:
 131     default:
 132       return kUnknown_SkColorType;
 133   }
 134 }
 135
 136 }  //  namespace gfx