android_webview/native/java_browser_view_renderer_helper.cc

   1 // Copyright (c) 2013 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 "android_webview/native/java_browser_view_renderer_helper.h"
   6
   7 #include <android/bitmap.h>
   8
   9 #include "android_webview/public/browser/draw_sw.h"
  10 #include "base/android/scoped_java_ref.h"
  11 #include "base/trace_event/trace_event.h"
  12 #include "jni/JavaBrowserViewRendererHelper_jni.h"
  13 #include "third_party/skia/include/core/SkBitmap.h"
  14 #include "third_party/skia/include/utils/SkCanvasStateUtils.h"
  15
  16 using base::android::ScopedJavaLocalRef;
  17
  18 namespace android_webview {
  19
  20 namespace {
  21
  22 // Provides software rendering functions from the Android glue layer.
  23 // Allows preventing extra copies of data when rendering.
  24 AwDrawSWFunctionTable* g_sw_draw_functions = NULL;
  25
  26 class JavaCanvasHolder : public SoftwareCanvasHolder {
  27  public:
  28   JavaCanvasHolder(JNIEnv* env,
  29                    jobject java_canvas,
  30                    const gfx::Vector2d& scroll_correction);
  31   ~JavaCanvasHolder() override;
  32
  33   SkCanvas* GetCanvas() override;
  34
  35  private:
  36   AwPixelInfo* pixels_;
  37   skia::RefPtr<SkCanvas> canvas_;
  38   DISALLOW_COPY_AND_ASSIGN(JavaCanvasHolder);
  39 };
  40
  41 JavaCanvasHolder::JavaCanvasHolder(JNIEnv* env,
  42                                    jobject java_canvas,
  43                                    const gfx::Vector2d& scroll)
  44     : pixels_(nullptr) {
  45   if (!g_sw_draw_functions)
  46     return;
  47   pixels_ = g_sw_draw_functions->access_pixels(env, java_canvas);
  48   if (!pixels_ || !pixels_->state)
  49     return;
  50
  51   canvas_ =
  52       skia::AdoptRef(SkCanvasStateUtils::CreateFromCanvasState(pixels_->state));
  53   // Workarounds for http://crbug.com/271096: SW draw only supports
  54   // translate & scale transforms, and a simple rectangular clip.
  55   if (canvas_ && (!canvas_->isClipRect() ||
  56                   (canvas_->getTotalMatrix().getType() &
  57                    ~(SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask)))) {
  58     canvas_.clear();
  59   }
  60   if (canvas_) {
  61     canvas_->translate(scroll.x(), scroll.y());
  62   }
  63 }
  64
  65 JavaCanvasHolder::~JavaCanvasHolder() {
  66   canvas_.clear();
  67   if (pixels_)
  68     g_sw_draw_functions->release_pixels(pixels_);
  69   pixels_ = nullptr;
  70 }
  71
  72 SkCanvas* JavaCanvasHolder::GetCanvas() {
  73   return canvas_.get();
  74 }
  75
  76 class AuxiliaryCanvasHolder : public SoftwareCanvasHolder {
  77  public:
  78   AuxiliaryCanvasHolder(JNIEnv* env,
  79                         jobject java_canvas,
  80                         const gfx::Vector2d& scroll_correction,
  81                         const gfx::Size size);
  82   ~AuxiliaryCanvasHolder() override;
  83
  84   SkCanvas* GetCanvas() override;
  85
  86  private:
  87   ScopedJavaLocalRef<jobject> jcanvas_;
  88   ScopedJavaLocalRef<jobject> jbitmap_;
  89   gfx::Vector2d scroll_;
  90   scoped_ptr<SkBitmap> bitmap_;
  91   skia::RefPtr<SkCanvas> canvas_;
  92   DISALLOW_COPY_AND_ASSIGN(AuxiliaryCanvasHolder);
  93 };
  94
  95 AuxiliaryCanvasHolder::AuxiliaryCanvasHolder(
  96     JNIEnv* env,
  97     jobject java_canvas,
  98     const gfx::Vector2d& scroll_correction,
  99     const gfx::Size size)
 100     : jcanvas_(env, java_canvas), scroll_(scroll_correction) {
 101   DCHECK(size.width() > 0);
 102   DCHECK(size.height() > 0);
 103   jbitmap_ = Java_JavaBrowserViewRendererHelper_createBitmap(
 104       env, size.width(), size.height(), jcanvas_.obj());
 105   if (!jbitmap_.obj())
 106     return;
 107
 108   AndroidBitmapInfo bitmap_info;
 109   if (AndroidBitmap_getInfo(env, jbitmap_.obj(), &bitmap_info) < 0) {
 110     LOG(ERROR) << "Error getting java bitmap info.";
 111     return;
 112   }
 113
 114   void* pixels = nullptr;
 115   if (AndroidBitmap_lockPixels(env, jbitmap_.obj(), &pixels) < 0) {
 116     LOG(ERROR) << "Error locking java bitmap pixels.";
 117     return;
 118   }
 119
 120   SkImageInfo info =
 121       SkImageInfo::MakeN32Premul(bitmap_info.width, bitmap_info.height);
 122   bitmap_.reset(new SkBitmap);
 123   bitmap_->installPixels(info, pixels, bitmap_info.stride);
 124   canvas_ = skia::AdoptRef(new SkCanvas(*bitmap_));
 125 }
 126
 127 AuxiliaryCanvasHolder::~AuxiliaryCanvasHolder() {
 128   canvas_.clear();
 129   bitmap_.reset();
 130
 131   JNIEnv* env = base::android::AttachCurrentThread();
 132   if (AndroidBitmap_unlockPixels(env, jbitmap_.obj()) < 0) {
 133     LOG(ERROR) << "Error unlocking java bitmap pixels.";
 134     return;
 135   }
 136
 137   Java_JavaBrowserViewRendererHelper_drawBitmapIntoCanvas(
 138       env, jbitmap_.obj(), jcanvas_.obj(), scroll_.x(), scroll_.y());
 139 }
 140
 141 SkCanvas* AuxiliaryCanvasHolder::GetCanvas() {
 142   return canvas_.get();
 143 }
 144
 145 }  // namespace
 146
 147 void RasterHelperSetAwDrawSWFunctionTable(AwDrawSWFunctionTable* table) {
 148   g_sw_draw_functions = table;
 149 }
 150
 151 // static
 152 scoped_ptr<SoftwareCanvasHolder> SoftwareCanvasHolder::Create(
 153     jobject java_canvas,
 154     const gfx::Vector2d& scroll_correction,
 155     const gfx::Size& auxiliary_bitmap_size) {
 156   JNIEnv* env = base::android::AttachCurrentThread();
 157   scoped_ptr<SoftwareCanvasHolder> holder(
 158       new JavaCanvasHolder(env, java_canvas, scroll_correction));
 159   if (!holder->GetCanvas()) {
 160     holder.reset();
 161     holder.reset(new AuxiliaryCanvasHolder(env, java_canvas, scroll_correction,
 162                                            auxiliary_bitmap_size));
 163   }
 164   if (!holder->GetCanvas()) {
 165     holder.reset();
 166   }
 167   return holder;
 168 }
 169
 170 bool RegisterJavaBrowserViewRendererHelper(JNIEnv* env) {
 171   return RegisterNativesImpl(env);
 172 }
 173
 174 }  // namespace android_webview