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      1 // Copyright 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/browser/in_process_view_renderer.h"
      6 
      7 #include <android/bitmap.h>
      8 
      9 #include "android_webview/browser/aw_gl_surface.h"
     10 #include "android_webview/browser/scoped_app_gl_state_restore.h"
     11 #include "android_webview/common/aw_switches.h"
     12 #include "android_webview/public/browser/draw_gl.h"
     13 #include "android_webview/public/browser/draw_sw.h"
     14 #include "base/android/jni_android.h"
     15 #include "base/auto_reset.h"
     16 #include "base/command_line.h"
     17 #include "base/debug/trace_event.h"
     18 #include "base/lazy_instance.h"
     19 #include "base/logging.h"
     20 #include "base/strings/string_number_conversions.h"
     21 #include "base/strings/stringprintf.h"
     22 #include "content/public/browser/browser_thread.h"
     23 #include "content/public/browser/web_contents.h"
     24 #include "content/public/common/content_switches.h"
     25 #include "gpu/command_buffer/service/in_process_command_buffer.h"
     26 #include "third_party/skia/include/core/SkBitmap.h"
     27 #include "third_party/skia/include/core/SkCanvas.h"
     28 #include "third_party/skia/include/core/SkDevice.h"
     29 #include "third_party/skia/include/core/SkGraphics.h"
     30 #include "third_party/skia/include/core/SkPicture.h"
     31 #include "third_party/skia/include/utils/SkCanvasStateUtils.h"
     32 #include "ui/gfx/skia_util.h"
     33 #include "ui/gfx/transform.h"
     34 #include "ui/gfx/vector2d_conversions.h"
     35 #include "ui/gfx/vector2d_f.h"
     36 
     37 using base::android::AttachCurrentThread;
     38 using base::android::JavaRef;
     39 using base::android::ScopedJavaLocalRef;
     40 using content::BrowserThread;
     41 
     42 namespace android_webview {
     43 
     44 namespace {
     45 
     46 
     47 const void* kUserDataKey = &kUserDataKey;
     48 
     49 class UserData : public content::WebContents::Data {
     50  public:
     51   UserData(InProcessViewRenderer* ptr) : instance_(ptr) {}
     52   virtual ~UserData() {
     53     instance_->WebContentsGone();
     54   }
     55 
     56   static InProcessViewRenderer* GetInstance(content::WebContents* contents) {
     57     if (!contents)
     58       return NULL;
     59     UserData* data = reinterpret_cast<UserData*>(
     60         contents->GetUserData(kUserDataKey));
     61     return data ? data->instance_ : NULL;
     62   }
     63 
     64  private:
     65   InProcessViewRenderer* instance_;
     66 };
     67 
     68 bool RasterizeIntoBitmap(JNIEnv* env,
     69                          const JavaRef<jobject>& jbitmap,
     70                          int scroll_x,
     71                          int scroll_y,
     72                          const InProcessViewRenderer::RenderMethod& renderer) {
     73   DCHECK(jbitmap.obj());
     74 
     75   AndroidBitmapInfo bitmap_info;
     76   if (AndroidBitmap_getInfo(env, jbitmap.obj(), &bitmap_info) < 0) {
     77     LOG(ERROR) << "Error getting java bitmap info.";
     78     return false;
     79   }
     80 
     81   void* pixels = NULL;
     82   if (AndroidBitmap_lockPixels(env, jbitmap.obj(), &pixels) < 0) {
     83     LOG(ERROR) << "Error locking java bitmap pixels.";
     84     return false;
     85   }
     86 
     87   bool succeeded;
     88   {
     89     SkBitmap bitmap;
     90     bitmap.setConfig(SkBitmap::kARGB_8888_Config,
     91                      bitmap_info.width,
     92                      bitmap_info.height,
     93                      bitmap_info.stride);
     94     bitmap.setPixels(pixels);
     95 
     96     SkDevice device(bitmap);
     97     SkCanvas canvas(&device);
     98     canvas.translate(-scroll_x, -scroll_y);
     99     succeeded = renderer.Run(&canvas);
    100   }
    101 
    102   if (AndroidBitmap_unlockPixels(env, jbitmap.obj()) < 0) {
    103     LOG(ERROR) << "Error unlocking java bitmap pixels.";
    104     return false;
    105   }
    106 
    107   return succeeded;
    108 }
    109 
    110 bool RenderPictureToCanvas(SkPicture* picture, SkCanvas* canvas) {
    111   canvas->drawPicture(*picture);
    112   return true;
    113 }
    114 
    115 class ScopedPixelAccess {
    116  public:
    117   ScopedPixelAccess(JNIEnv* env, jobject java_canvas) {
    118     AwDrawSWFunctionTable* sw_functions =
    119         BrowserViewRenderer::GetAwDrawSWFunctionTable();
    120     pixels_ = sw_functions ?
    121       sw_functions->access_pixels(env, java_canvas) : NULL;
    122   }
    123   ~ScopedPixelAccess() {
    124     if (pixels_)
    125       BrowserViewRenderer::GetAwDrawSWFunctionTable()->release_pixels(pixels_);
    126   }
    127   AwPixelInfo* pixels() { return pixels_; }
    128 
    129  private:
    130   AwPixelInfo* pixels_;
    131 
    132   DISALLOW_IMPLICIT_CONSTRUCTORS(ScopedPixelAccess);
    133 };
    134 
    135 bool HardwareEnabled() {
    136   static bool g_hw_enabled = !CommandLine::ForCurrentProcess()->HasSwitch(
    137       switches::kDisableWebViewGLMode);
    138   return g_hw_enabled;
    139 }
    140 
    141 // Provides software rendering functions from the Android glue layer.
    142 // Allows preventing extra copies of data when rendering.
    143 AwDrawSWFunctionTable* g_sw_draw_functions = NULL;
    144 
    145 const int64 kFallbackTickTimeoutInMilliseconds = 20;
    146 
    147 
    148 // Used to calculate memory and resource allocation. Determined experimentally.
    149 size_t g_memory_multiplier = 10;
    150 const size_t kMaxNumTilesToFillDisplay = 20;
    151 const size_t kBytesPerPixel = 4;
    152 const size_t kMemoryAllocationStep = 5 * 1024 * 1024;
    153 
    154 class ScopedAllowGL {
    155  public:
    156   ScopedAllowGL();
    157   ~ScopedAllowGL();
    158 
    159   static bool IsAllowed() {
    160     return BrowserThread::CurrentlyOn(BrowserThread::UI) && allow_gl;
    161   }
    162 
    163  private:
    164   static bool allow_gl;
    165 
    166   DISALLOW_COPY_AND_ASSIGN(ScopedAllowGL);
    167 };
    168 
    169 ScopedAllowGL::ScopedAllowGL() {
    170   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
    171   DCHECK(!allow_gl);
    172   allow_gl = true;
    173 }
    174 
    175 ScopedAllowGL::~ScopedAllowGL() {
    176   allow_gl = false;
    177 }
    178 
    179 bool ScopedAllowGL::allow_gl = false;
    180 
    181 base::LazyInstance<GLViewRendererManager>::Leaky g_view_renderer_manager;
    182 
    183 void RequestProcessGLOnUIThread() {
    184   if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
    185     BrowserThread::PostTask(
    186         BrowserThread::UI, FROM_HERE, base::Bind(&RequestProcessGLOnUIThread));
    187     return;
    188   }
    189 
    190   InProcessViewRenderer* renderer = static_cast<InProcessViewRenderer*>(
    191       g_view_renderer_manager.Get().GetMostRecentlyDrawn());
    192   if (!renderer || !renderer->RequestProcessGL()) {
    193     LOG(ERROR) << "Failed to request GL process. Deadlock likely: "
    194                << !!renderer;
    195   }
    196 }
    197 
    198 }  // namespace
    199 
    200 // Called from different threads!
    201 static void ScheduleGpuWork() {
    202   if (ScopedAllowGL::IsAllowed()) {
    203     gpu::InProcessCommandBuffer::ProcessGpuWorkOnCurrentThread();
    204   } else {
    205     RequestProcessGLOnUIThread();
    206   }
    207 }
    208 
    209 // static
    210 void BrowserViewRenderer::SetAwDrawSWFunctionTable(
    211     AwDrawSWFunctionTable* table) {
    212   g_sw_draw_functions = table;
    213   gpu::InProcessCommandBuffer::SetScheduleCallback(
    214       base::Bind(&ScheduleGpuWork));
    215 }
    216 
    217 // static
    218 AwDrawSWFunctionTable* BrowserViewRenderer::GetAwDrawSWFunctionTable() {
    219   return g_sw_draw_functions;
    220 }
    221 
    222 InProcessViewRenderer::InProcessViewRenderer(
    223     BrowserViewRenderer::Client* client,
    224     JavaHelper* java_helper,
    225     content::WebContents* web_contents)
    226     : client_(client),
    227       java_helper_(java_helper),
    228       web_contents_(web_contents),
    229       compositor_(NULL),
    230       is_paused_(false),
    231       view_visible_(false),
    232       window_visible_(false),
    233       attached_to_window_(false),
    234       dip_scale_(0.0),
    235       page_scale_factor_(1.0),
    236       on_new_picture_enable_(false),
    237       compositor_needs_continuous_invalidate_(false),
    238       block_invalidates_(false),
    239       width_(0),
    240       height_(0),
    241       hardware_initialized_(false),
    242       hardware_failed_(false),
    243       last_egl_context_(NULL),
    244       manager_key_(g_view_renderer_manager.Get().NullKey()) {
    245   CHECK(web_contents_);
    246   web_contents_->SetUserData(kUserDataKey, new UserData(this));
    247   content::SynchronousCompositor::SetClientForWebContents(web_contents_, this);
    248 
    249   // Currently the logic in this class relies on |compositor_| remaining NULL
    250   // until the DidInitializeCompositor() call, hence it is not set here.
    251 }
    252 
    253 InProcessViewRenderer::~InProcessViewRenderer() {
    254   CHECK(web_contents_);
    255   content::SynchronousCompositor::SetClientForWebContents(web_contents_, NULL);
    256   web_contents_->SetUserData(kUserDataKey, NULL);
    257   NoLongerExpectsDrawGL();
    258   DCHECK(web_contents_ == NULL);  // WebContentsGone should have been called.
    259 }
    260 
    261 
    262 // TODO(boliu): Should also call this when we know for sure we are no longer,
    263 // for example, when visible rect becomes 0.
    264 void InProcessViewRenderer::NoLongerExpectsDrawGL() {
    265   GLViewRendererManager& mru = g_view_renderer_manager.Get();
    266   if (manager_key_ != mru.NullKey()) {
    267     mru.NoLongerExpectsDrawGL(manager_key_);
    268     manager_key_ = mru.NullKey();
    269 
    270     // TODO(boliu): If this is the first one and there are GL pending,
    271     // requestDrawGL on next one.
    272     // TODO(boliu): If this is the last one, lose all global contexts.
    273   }
    274 }
    275 
    276 // static
    277 InProcessViewRenderer* InProcessViewRenderer::FromWebContents(
    278     content::WebContents* contents) {
    279   return UserData::GetInstance(contents);
    280 }
    281 
    282 void InProcessViewRenderer::WebContentsGone() {
    283   web_contents_ = NULL;
    284   compositor_ = NULL;
    285 }
    286 
    287 // static
    288 void InProcessViewRenderer::CalculateTileMemoryPolicy() {
    289   CommandLine* cl = CommandLine::ForCurrentProcess();
    290   if (cl->HasSwitch(switches::kTileMemoryMultiplier)) {
    291     std::string string_value =
    292         cl->GetSwitchValueASCII(switches::kTileMemoryMultiplier);
    293     int int_value;
    294     if (base::StringToInt(string_value, &int_value) &&
    295         int_value >= 2 && int_value <= 50) {
    296       g_memory_multiplier = int_value;
    297     }
    298   }
    299 
    300   if (cl->HasSwitch(switches::kDefaultTileWidth) ||
    301       cl->HasSwitch(switches::kDefaultTileHeight)) {
    302     return;
    303   }
    304 
    305   const int default_tile_size = 512;
    306   std::stringstream size;
    307   size << default_tile_size;
    308   cl->AppendSwitchASCII(switches::kDefaultTileWidth, size.str());
    309   cl->AppendSwitchASCII(switches::kDefaultTileHeight, size.str());
    310 }
    311 
    312 bool InProcessViewRenderer::RequestProcessGL() {
    313   return client_->RequestDrawGL(NULL);
    314 }
    315 
    316 void InProcessViewRenderer::TrimMemory(int level) {
    317   // Constants from Android ComponentCallbacks2.
    318   enum {
    319     TRIM_MEMORY_RUNNING_LOW = 10,
    320     TRIM_MEMORY_UI_HIDDEN = 20,
    321     TRIM_MEMORY_BACKGROUND = 40,
    322   };
    323 
    324   // Not urgent enough. TRIM_MEMORY_UI_HIDDEN is treated specially because
    325   // it does not indicate memory pressure, but merely that the app is
    326   // backgrounded.
    327   if (level < TRIM_MEMORY_RUNNING_LOW || level == TRIM_MEMORY_UI_HIDDEN)
    328     return;
    329 
    330   // Nothing to drop.
    331   if (!attached_to_window_ || !hardware_initialized_ || !compositor_)
    332     return;
    333 
    334   // Do not release resources on view we expect to get DrawGL soon.
    335   if (level < TRIM_MEMORY_BACKGROUND) {
    336     client_->UpdateGlobalVisibleRect();
    337     if (view_visible_ && window_visible_ &&
    338         !cached_global_visible_rect_.IsEmpty()) {
    339       return;
    340     }
    341   }
    342 
    343   if (!eglGetCurrentContext()) {
    344     NOTREACHED();
    345     return;
    346   }
    347 
    348   // Just set the memory limit to 0 and drop all tiles. This will be reset to
    349   // normal levels in the next DrawGL call.
    350   content::SynchronousCompositorMemoryPolicy policy;
    351   policy.bytes_limit = 0;
    352   policy.num_resources_limit = 0;
    353   if (memory_policy_ == policy)
    354     return;
    355 
    356   TRACE_EVENT0("android_webview", "InProcessViewRenderer::TrimMemory");
    357   ScopedAppGLStateRestore state_restore(
    358       ScopedAppGLStateRestore::MODE_RESOURCE_MANAGEMENT);
    359   gpu::InProcessCommandBuffer::ProcessGpuWorkOnCurrentThread();
    360   ScopedAllowGL allow_gl;
    361 
    362   SetMemoryPolicy(policy);
    363   ForceFakeCompositeSW();
    364 }
    365 
    366 void InProcessViewRenderer::SetMemoryPolicy(
    367     content::SynchronousCompositorMemoryPolicy& new_policy) {
    368   if (memory_policy_ == new_policy)
    369     return;
    370 
    371   memory_policy_ = new_policy;
    372   compositor_->SetMemoryPolicy(memory_policy_);
    373 }
    374 
    375 void InProcessViewRenderer::UpdateCachedGlobalVisibleRect() {
    376   client_->UpdateGlobalVisibleRect();
    377 }
    378 
    379 bool InProcessViewRenderer::OnDraw(jobject java_canvas,
    380                                    bool is_hardware_canvas,
    381                                    const gfx::Vector2d& scroll,
    382                                    const gfx::Rect& clip) {
    383   scroll_at_start_of_frame_  = scroll;
    384   if (is_hardware_canvas && attached_to_window_ && HardwareEnabled()) {
    385     // We should be performing a hardware draw here. If we don't have the
    386     // comositor yet or if RequestDrawGL fails, it means we failed this draw and
    387     // thus return false here to clear to background color for this draw.
    388     return compositor_ && client_->RequestDrawGL(java_canvas);
    389   }
    390   // Perform a software draw
    391   return DrawSWInternal(java_canvas, clip);
    392 }
    393 
    394 bool InProcessViewRenderer::InitializeHwDraw() {
    395   TRACE_EVENT0("android_webview", "InitializeHwDraw");
    396   DCHECK(!gl_surface_);
    397   gl_surface_  = new AwGLSurface;
    398   hardware_failed_ = !compositor_->InitializeHwDraw(gl_surface_);
    399   hardware_initialized_ = true;
    400 
    401   if (hardware_failed_)
    402     gl_surface_ = NULL;
    403 
    404   return !hardware_failed_;
    405 }
    406 
    407 void InProcessViewRenderer::DrawGL(AwDrawGLInfo* draw_info) {
    408   TRACE_EVENT0("android_webview", "InProcessViewRenderer::DrawGL");
    409 
    410   manager_key_ = g_view_renderer_manager.Get().DidDrawGL(manager_key_, this);
    411 
    412   // We need to watch if the current Android context has changed and enforce
    413   // a clean-up in the compositor.
    414   EGLContext current_context = eglGetCurrentContext();
    415   if (!current_context) {
    416     TRACE_EVENT_INSTANT0(
    417         "android_webview", "EarlyOut_NullEGLContext", TRACE_EVENT_SCOPE_THREAD);
    418     return;
    419   }
    420 
    421   ScopedAppGLStateRestore state_restore(ScopedAppGLStateRestore::MODE_DRAW);
    422   gpu::InProcessCommandBuffer::ProcessGpuWorkOnCurrentThread();
    423   ScopedAllowGL allow_gl;
    424 
    425   if (!attached_to_window_) {
    426     TRACE_EVENT_INSTANT0(
    427         "android_webview", "EarlyOut_NotAttached", TRACE_EVENT_SCOPE_THREAD);
    428     return;
    429   }
    430 
    431   if (draw_info->mode == AwDrawGLInfo::kModeProcess) {
    432     TRACE_EVENT_INSTANT0(
    433         "android_webview", "EarlyOut_ModeProcess", TRACE_EVENT_SCOPE_THREAD);
    434     return;
    435   }
    436 
    437   if (compositor_ && !hardware_initialized_) {
    438     if (InitializeHwDraw()) {
    439       last_egl_context_ = current_context;
    440     } else {
    441       TRACE_EVENT_INSTANT0(
    442           "android_webview", "EarlyOut_HwInitFail", TRACE_EVENT_SCOPE_THREAD);
    443       LOG(ERROR) << "WebView hardware initialization failed";
    444       return;
    445     }
    446   }
    447 
    448   UpdateCachedGlobalVisibleRect();
    449   if (cached_global_visible_rect_.IsEmpty()) {
    450     TRACE_EVENT_INSTANT0("android_webview",
    451                          "EarlyOut_EmptyVisibleRect",
    452                          TRACE_EVENT_SCOPE_THREAD);
    453     return;
    454   }
    455 
    456   if (last_egl_context_ != current_context) {
    457     // TODO(boliu): Handle context lost
    458     TRACE_EVENT_INSTANT0(
    459         "android_webview", "EGLContextChanged", TRACE_EVENT_SCOPE_THREAD);
    460   }
    461 
    462   if (!compositor_) {
    463     TRACE_EVENT_INSTANT0(
    464         "android_webview", "EarlyOut_NoCompositor", TRACE_EVENT_SCOPE_THREAD);
    465     return;
    466   }
    467 
    468   // DrawGL may be called without OnDraw, so cancel |fallback_tick_| here as
    469   // well just to be safe.
    470   fallback_tick_.Cancel();
    471 
    472   // Update memory budget. This will no-op in compositor if the policy has not
    473   // changed since last draw.
    474   content::SynchronousCompositorMemoryPolicy policy;
    475   policy.bytes_limit = g_memory_multiplier * kBytesPerPixel *
    476                        cached_global_visible_rect_.width() *
    477                        cached_global_visible_rect_.height();
    478   // Round up to a multiple of kMemoryAllocationStep.
    479   policy.bytes_limit =
    480       (policy.bytes_limit / kMemoryAllocationStep + 1) * kMemoryAllocationStep;
    481   policy.num_resources_limit = kMaxNumTilesToFillDisplay * g_memory_multiplier;
    482   SetMemoryPolicy(policy);
    483 
    484   DCHECK(gl_surface_);
    485   gl_surface_->SetBackingFrameBufferObject(
    486       state_restore.framebuffer_binding_ext());
    487 
    488   gfx::Transform transform;
    489   transform.matrix().setColMajorf(draw_info->transform);
    490   transform.Translate(scroll_at_start_of_frame_.x(),
    491                       scroll_at_start_of_frame_.y());
    492   gfx::Rect clip_rect(draw_info->clip_left,
    493                       draw_info->clip_top,
    494                       draw_info->clip_right - draw_info->clip_left,
    495                       draw_info->clip_bottom - draw_info->clip_top);
    496 
    497   // Assume we always draw the full visible rect if we are drawing into a layer.
    498   bool drew_full_visible_rect = true;
    499 
    500   gfx::Rect viewport_rect;
    501   if (!draw_info->is_layer) {
    502     viewport_rect = cached_global_visible_rect_;
    503     clip_rect.Intersect(viewport_rect);
    504     drew_full_visible_rect = clip_rect.Contains(viewport_rect);
    505   } else {
    506     viewport_rect = clip_rect;
    507   }
    508 
    509   block_invalidates_ = true;
    510   // TODO(joth): Check return value.
    511   compositor_->DemandDrawHw(gfx::Size(draw_info->width, draw_info->height),
    512                             transform,
    513                             viewport_rect,
    514                             clip_rect,
    515                             state_restore.stencil_enabled());
    516   block_invalidates_ = false;
    517   gl_surface_->ResetBackingFrameBufferObject();
    518 
    519   EnsureContinuousInvalidation(draw_info, !drew_full_visible_rect);
    520 }
    521 
    522 void InProcessViewRenderer::SetGlobalVisibleRect(
    523     const gfx::Rect& visible_rect) {
    524   cached_global_visible_rect_ = visible_rect;
    525 }
    526 
    527 bool InProcessViewRenderer::DrawSWInternal(jobject java_canvas,
    528                                            const gfx::Rect& clip) {
    529   if (clip.IsEmpty()) {
    530     TRACE_EVENT_INSTANT0(
    531         "android_webview", "EarlyOut_EmptyClip", TRACE_EVENT_SCOPE_THREAD);
    532     return true;
    533   }
    534 
    535   if (!compositor_) {
    536     TRACE_EVENT_INSTANT0(
    537         "android_webview", "EarlyOut_NoCompositor", TRACE_EVENT_SCOPE_THREAD);
    538     return false;
    539   }
    540 
    541   return RenderViaAuxilaryBitmapIfNeeded(
    542       java_canvas,
    543       java_helper_,
    544       scroll_at_start_of_frame_,
    545       clip,
    546       base::Bind(&InProcessViewRenderer::CompositeSW,
    547                  base::Unretained(this)),
    548       web_contents_);
    549 }
    550 
    551 // static
    552 bool InProcessViewRenderer::RenderViaAuxilaryBitmapIfNeeded(
    553       jobject java_canvas,
    554       BrowserViewRenderer::JavaHelper* java_helper,
    555       const gfx::Vector2d& scroll_correction,
    556       const gfx::Rect& clip,
    557       InProcessViewRenderer::RenderMethod render_source,
    558       void* owner_key) {
    559   TRACE_EVENT0("android_webview",
    560                "InProcessViewRenderer::RenderViaAuxilaryBitmapIfNeeded");
    561 
    562   JNIEnv* env = AttachCurrentThread();
    563   ScopedPixelAccess auto_release_pixels(env, java_canvas);
    564   AwPixelInfo* pixels = auto_release_pixels.pixels();
    565   if (pixels && pixels->state) {
    566     skia::RefPtr<SkCanvas> canvas = skia::AdoptRef(
    567         SkCanvasStateUtils::CreateFromCanvasState(pixels->state));
    568 
    569     // Workarounds for http://crbug.com/271096: SW draw only supports
    570     // translate & scale transforms, and a simple rectangular clip.
    571     if (canvas && (!canvas->getTotalClip().isRect() ||
    572           (canvas->getTotalMatrix().getType() &
    573            ~(SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask)))) {
    574       canvas.clear();
    575     }
    576     if (canvas) {
    577       canvas->translate(scroll_correction.x(), scroll_correction.y());
    578       return render_source.Run(canvas.get());
    579     }
    580   }
    581 
    582   // Render into an auxiliary bitmap if pixel info is not available.
    583   ScopedJavaLocalRef<jobject> jcanvas(env, java_canvas);
    584   TRACE_EVENT0("android_webview", "RenderToAuxBitmap");
    585   ScopedJavaLocalRef<jobject> jbitmap(java_helper->CreateBitmap(
    586       env, clip.width(), clip.height(), jcanvas, owner_key));
    587   if (!jbitmap.obj()) {
    588     TRACE_EVENT_INSTANT0("android_webview",
    589                          "EarlyOut_BitmapAllocFail",
    590                          TRACE_EVENT_SCOPE_THREAD);
    591     return false;
    592   }
    593 
    594   if (!RasterizeIntoBitmap(env, jbitmap,
    595                            clip.x() - scroll_correction.x(),
    596                            clip.y() - scroll_correction.y(),
    597                            render_source)) {
    598     TRACE_EVENT_INSTANT0("android_webview",
    599                          "EarlyOut_RasterizeFail",
    600                          TRACE_EVENT_SCOPE_THREAD);
    601     return false;
    602   }
    603 
    604   java_helper->DrawBitmapIntoCanvas(env, jbitmap, jcanvas,
    605                                     clip.x(), clip.y());
    606   return true;
    607 }
    608 
    609 skia::RefPtr<SkPicture> InProcessViewRenderer::CapturePicture(int width,
    610                                                               int height) {
    611   TRACE_EVENT0("android_webview", "InProcessViewRenderer::CapturePicture");
    612 
    613   // Return empty Picture objects for empty SkPictures.
    614   skia::RefPtr<SkPicture> picture = skia::AdoptRef(new SkPicture);
    615   if (width <= 0 || height <= 0) {
    616     return picture;
    617   }
    618 
    619   // Reset scroll back to the origin, will go back to the old
    620   // value when scroll_reset is out of scope.
    621   base::AutoReset<gfx::Vector2dF> scroll_reset(&scroll_offset_dip_,
    622                                                gfx::Vector2d());
    623 
    624   SkCanvas* rec_canvas = picture->beginRecording(width, height, 0);
    625   if (compositor_)
    626     CompositeSW(rec_canvas);
    627   picture->endRecording();
    628   return picture;
    629 }
    630 
    631 void InProcessViewRenderer::EnableOnNewPicture(bool enabled) {
    632   on_new_picture_enable_ = enabled;
    633 }
    634 
    635 void InProcessViewRenderer::SetIsPaused(bool paused) {
    636   TRACE_EVENT_INSTANT1("android_webview",
    637                        "InProcessViewRenderer::SetIsPaused",
    638                        TRACE_EVENT_SCOPE_THREAD,
    639                        "paused",
    640                        paused);
    641   is_paused_ = paused;
    642   EnsureContinuousInvalidation(NULL, false);
    643 }
    644 
    645 void InProcessViewRenderer::SetViewVisibility(bool view_visible) {
    646   TRACE_EVENT_INSTANT1("android_webview",
    647                        "InProcessViewRenderer::SetViewVisibility",
    648                        TRACE_EVENT_SCOPE_THREAD,
    649                        "view_visible",
    650                        view_visible);
    651   view_visible_ = view_visible;
    652 }
    653 
    654 void InProcessViewRenderer::SetWindowVisibility(bool window_visible) {
    655   TRACE_EVENT_INSTANT1("android_webview",
    656                        "InProcessViewRenderer::SetWindowVisibility",
    657                        TRACE_EVENT_SCOPE_THREAD,
    658                        "window_visible",
    659                        window_visible);
    660   window_visible_ = window_visible;
    661   EnsureContinuousInvalidation(NULL, false);
    662 }
    663 
    664 void InProcessViewRenderer::OnSizeChanged(int width, int height) {
    665   TRACE_EVENT_INSTANT2("android_webview",
    666                        "InProcessViewRenderer::OnSizeChanged",
    667                        TRACE_EVENT_SCOPE_THREAD,
    668                        "width",
    669                        width,
    670                        "height",
    671                        height);
    672   width_ = width;
    673   height_ = height;
    674 }
    675 
    676 void InProcessViewRenderer::OnAttachedToWindow(int width, int height) {
    677   TRACE_EVENT2("android_webview",
    678                "InProcessViewRenderer::OnAttachedToWindow",
    679                "width",
    680                width,
    681                "height",
    682                height);
    683   attached_to_window_ = true;
    684   width_ = width;
    685   height_ = height;
    686 }
    687 
    688 void InProcessViewRenderer::OnDetachedFromWindow() {
    689   TRACE_EVENT0("android_webview",
    690                "InProcessViewRenderer::OnDetachedFromWindow");
    691 
    692   NoLongerExpectsDrawGL();
    693   if (hardware_initialized_) {
    694     DCHECK(compositor_);
    695 
    696     ScopedAppGLStateRestore state_restore(
    697         ScopedAppGLStateRestore::MODE_RESOURCE_MANAGEMENT);
    698     gpu::InProcessCommandBuffer::ProcessGpuWorkOnCurrentThread();
    699     ScopedAllowGL allow_gl;
    700     compositor_->ReleaseHwDraw();
    701     hardware_initialized_ = false;
    702   }
    703 
    704   gl_surface_ = NULL;
    705   attached_to_window_ = false;
    706 }
    707 
    708 bool InProcessViewRenderer::IsAttachedToWindow() {
    709   return attached_to_window_;
    710 }
    711 
    712 bool InProcessViewRenderer::IsVisible() {
    713   // Ignore |window_visible_| if |attached_to_window_| is false.
    714   return view_visible_ && (!attached_to_window_ || window_visible_);
    715 }
    716 
    717 gfx::Rect InProcessViewRenderer::GetScreenRect() {
    718   return gfx::Rect(client_->GetLocationOnScreen(), gfx::Size(width_, height_));
    719 }
    720 
    721 void InProcessViewRenderer::DidInitializeCompositor(
    722     content::SynchronousCompositor* compositor) {
    723   TRACE_EVENT0("android_webview",
    724                "InProcessViewRenderer::DidInitializeCompositor");
    725   DCHECK(compositor && compositor_ == NULL);
    726   compositor_ = compositor;
    727   hardware_initialized_ = false;
    728   hardware_failed_ = false;
    729 }
    730 
    731 void InProcessViewRenderer::DidDestroyCompositor(
    732     content::SynchronousCompositor* compositor) {
    733   TRACE_EVENT0("android_webview",
    734                "InProcessViewRenderer::DidDestroyCompositor");
    735   DCHECK(compositor_ == compositor);
    736 
    737   // This can fail if Apps call destroy while the webview is still attached
    738   // to the view tree. This is an illegal operation that will lead to leaks.
    739   // Log for now. Consider a proper fix if this becomes a problem.
    740   LOG_IF(ERROR, hardware_initialized_)
    741       << "Destroy called before OnDetachedFromWindow. May Leak GL resources";
    742   compositor_ = NULL;
    743 }
    744 
    745 void InProcessViewRenderer::SetContinuousInvalidate(bool invalidate) {
    746   if (compositor_needs_continuous_invalidate_ == invalidate)
    747     return;
    748 
    749   TRACE_EVENT_INSTANT1("android_webview",
    750                        "InProcessViewRenderer::SetContinuousInvalidate",
    751                        TRACE_EVENT_SCOPE_THREAD,
    752                        "invalidate",
    753                        invalidate);
    754   compositor_needs_continuous_invalidate_ = invalidate;
    755   EnsureContinuousInvalidation(NULL, false);
    756 }
    757 
    758 void InProcessViewRenderer::SetDipScale(float dip_scale) {
    759   dip_scale_ = dip_scale;
    760   CHECK(dip_scale_ > 0);
    761 }
    762 
    763 gfx::Vector2d InProcessViewRenderer::max_scroll_offset() const {
    764   DCHECK_GT(dip_scale_, 0);
    765   return gfx::ToCeiledVector2d(gfx::ScaleVector2d(
    766       max_scroll_offset_dip_, dip_scale_ * page_scale_factor_));
    767 }
    768 
    769 void InProcessViewRenderer::ScrollTo(gfx::Vector2d scroll_offset) {
    770   gfx::Vector2d max_offset = max_scroll_offset();
    771   gfx::Vector2dF scroll_offset_dip;
    772   // To preserve the invariant that scrolling to the maximum physical pixel
    773   // value also scrolls to the maximum dip pixel value we transform the physical
    774   // offset into the dip offset by using a proportion (instead of dividing by
    775   // dip_scale * page_scale_factor).
    776   if (max_offset.x()) {
    777     scroll_offset_dip.set_x((scroll_offset.x() * max_scroll_offset_dip_.x()) /
    778                             max_offset.x());
    779   }
    780   if (max_offset.y()) {
    781     scroll_offset_dip.set_y((scroll_offset.y() * max_scroll_offset_dip_.y()) /
    782                             max_offset.y());
    783   }
    784 
    785   DCHECK_LE(0, scroll_offset_dip.x());
    786   DCHECK_LE(0, scroll_offset_dip.y());
    787   DCHECK_LE(scroll_offset_dip.x(), max_scroll_offset_dip_.x());
    788   DCHECK_LE(scroll_offset_dip.y(), max_scroll_offset_dip_.y());
    789 
    790   if (scroll_offset_dip_ == scroll_offset_dip)
    791     return;
    792 
    793   scroll_offset_dip_ = scroll_offset_dip;
    794 
    795   if (compositor_)
    796     compositor_->DidChangeRootLayerScrollOffset();
    797 }
    798 
    799 void InProcessViewRenderer::DidUpdateContent() {
    800   if (on_new_picture_enable_)
    801     client_->OnNewPicture();
    802 }
    803 
    804 void InProcessViewRenderer::SetMaxRootLayerScrollOffset(
    805     gfx::Vector2dF new_value_dip) {
    806   DCHECK_GT(dip_scale_, 0);
    807 
    808   max_scroll_offset_dip_ = new_value_dip;
    809   DCHECK_LE(0, max_scroll_offset_dip_.x());
    810   DCHECK_LE(0, max_scroll_offset_dip_.y());
    811 
    812   client_->SetMaxContainerViewScrollOffset(max_scroll_offset());
    813 }
    814 
    815 void InProcessViewRenderer::SetTotalRootLayerScrollOffset(
    816     gfx::Vector2dF scroll_offset_dip) {
    817   // TOOD(mkosiba): Add a DCHECK to say that this does _not_ get called during
    818   // DrawGl when http://crbug.com/249972 is fixed.
    819   if (scroll_offset_dip_ == scroll_offset_dip)
    820     return;
    821 
    822   scroll_offset_dip_ = scroll_offset_dip;
    823 
    824   gfx::Vector2d max_offset = max_scroll_offset();
    825   gfx::Vector2d scroll_offset;
    826   // For an explanation as to why this is done this way see the comment in
    827   // InProcessViewRenderer::ScrollTo.
    828   if (max_scroll_offset_dip_.x()) {
    829     scroll_offset.set_x((scroll_offset_dip.x() * max_offset.x()) /
    830                         max_scroll_offset_dip_.x());
    831   }
    832 
    833   if (max_scroll_offset_dip_.y()) {
    834     scroll_offset.set_y((scroll_offset_dip.y() * max_offset.y()) /
    835                         max_scroll_offset_dip_.y());
    836   }
    837 
    838   DCHECK(0 <= scroll_offset.x());
    839   DCHECK(0 <= scroll_offset.y());
    840   DCHECK(scroll_offset.x() <= max_offset.x());
    841   DCHECK(scroll_offset.y() <= max_offset.y());
    842 
    843   client_->ScrollContainerViewTo(scroll_offset);
    844 }
    845 
    846 gfx::Vector2dF InProcessViewRenderer::GetTotalRootLayerScrollOffset() {
    847   return scroll_offset_dip_;
    848 }
    849 
    850 bool InProcessViewRenderer::IsExternalFlingActive() const {
    851   return client_->IsFlingActive();
    852 }
    853 
    854 void InProcessViewRenderer::SetRootLayerPageScaleFactor(
    855     float page_scale_factor) {
    856   page_scale_factor_ = page_scale_factor;
    857   DCHECK_GT(page_scale_factor_, 0);
    858   client_->SetPageScaleFactor(page_scale_factor);
    859 }
    860 
    861 void InProcessViewRenderer::SetRootLayerScrollableSize(
    862     gfx::SizeF scrollable_size) {
    863   client_->SetContentsSize(scrollable_size);
    864 }
    865 
    866 void InProcessViewRenderer::DidOverscroll(
    867     gfx::Vector2dF accumulated_overscroll,
    868     gfx::Vector2dF latest_overscroll_delta,
    869     gfx::Vector2dF current_fling_velocity) {
    870   DCHECK(current_fling_velocity.IsZero());
    871   const float physical_pixel_scale = dip_scale_ * page_scale_factor_;
    872   if (accumulated_overscroll == latest_overscroll_delta)
    873     overscroll_rounding_error_ = gfx::Vector2dF();
    874   gfx::Vector2dF scaled_overscroll_delta =
    875       gfx::ScaleVector2d(latest_overscroll_delta, physical_pixel_scale);
    876   gfx::Vector2d rounded_overscroll_delta = gfx::ToRoundedVector2d(
    877       scaled_overscroll_delta + overscroll_rounding_error_);
    878   overscroll_rounding_error_ =
    879       scaled_overscroll_delta - rounded_overscroll_delta;
    880   client_->DidOverscroll(rounded_overscroll_delta);
    881 }
    882 
    883 void InProcessViewRenderer::EnsureContinuousInvalidation(
    884     AwDrawGLInfo* draw_info,
    885     bool invalidate_ignore_compositor) {
    886   // This method should be called again when any of these conditions change.
    887   bool need_invalidate =
    888       compositor_needs_continuous_invalidate_ || invalidate_ignore_compositor;
    889   bool throttle = is_paused_ || (attached_to_window_ && !window_visible_);
    890   if (!need_invalidate || block_invalidates_ || throttle)
    891     return;
    892 
    893   if (draw_info) {
    894     draw_info->dirty_left = cached_global_visible_rect_.x();
    895     draw_info->dirty_top = cached_global_visible_rect_.y();
    896     draw_info->dirty_right = cached_global_visible_rect_.right();
    897     draw_info->dirty_bottom = cached_global_visible_rect_.bottom();
    898     draw_info->status_mask |= AwDrawGLInfo::kStatusMaskDraw;
    899   } else {
    900     client_->PostInvalidate();
    901   }
    902 
    903   block_invalidates_ = compositor_needs_continuous_invalidate_;
    904 
    905   // Unretained here is safe because the callback is cancelled when
    906   // |fallback_tick_| is destroyed.
    907   fallback_tick_.Reset(base::Bind(&InProcessViewRenderer::FallbackTickFired,
    908                                   base::Unretained(this)));
    909 
    910   // No need to reschedule fallback tick if compositor does not need to be
    911   // ticked. This can happen if this is reached because
    912   // invalidate_ignore_compositor is true.
    913   if (compositor_needs_continuous_invalidate_) {
    914     BrowserThread::PostDelayedTask(
    915         BrowserThread::UI,
    916         FROM_HERE,
    917         fallback_tick_.callback(),
    918         base::TimeDelta::FromMilliseconds(
    919             kFallbackTickTimeoutInMilliseconds));
    920   }
    921 }
    922 
    923 void InProcessViewRenderer::FallbackTickFired() {
    924   TRACE_EVENT1("android_webview",
    925                "InProcessViewRenderer::FallbackTickFired",
    926                "compositor_needs_continuous_invalidate_",
    927                compositor_needs_continuous_invalidate_);
    928 
    929   // This should only be called if OnDraw or DrawGL did not come in time, which
    930   // means block_invalidates_ must still be true.
    931   DCHECK(block_invalidates_);
    932   if (compositor_needs_continuous_invalidate_ && compositor_)
    933     ForceFakeCompositeSW();
    934 }
    935 
    936 void InProcessViewRenderer::ForceFakeCompositeSW() {
    937   DCHECK(compositor_);
    938   SkDevice device(SkBitmap::kARGB_8888_Config, 1, 1);
    939   SkCanvas canvas(&device);
    940   CompositeSW(&canvas);
    941 }
    942 
    943 bool InProcessViewRenderer::CompositeSW(SkCanvas* canvas) {
    944   DCHECK(compositor_);
    945 
    946   fallback_tick_.Cancel();
    947   block_invalidates_ = true;
    948   bool result = compositor_->DemandDrawSw(canvas);
    949   block_invalidates_ = false;
    950   EnsureContinuousInvalidation(NULL, false);
    951   return result;
    952 }
    953 
    954 std::string InProcessViewRenderer::ToString(AwDrawGLInfo* draw_info) const {
    955   std::string str;
    956   base::StringAppendF(&str, "is_paused: %d ", is_paused_);
    957   base::StringAppendF(&str, "view_visible: %d ", view_visible_);
    958   base::StringAppendF(&str, "window_visible: %d ", window_visible_);
    959   base::StringAppendF(&str, "dip_scale: %f ", dip_scale_);
    960   base::StringAppendF(&str, "page_scale_factor: %f ", page_scale_factor_);
    961   base::StringAppendF(&str,
    962                       "compositor_needs_continuous_invalidate: %d ",
    963                       compositor_needs_continuous_invalidate_);
    964   base::StringAppendF(&str, "block_invalidates: %d ", block_invalidates_);
    965   base::StringAppendF(&str, "view width height: [%d %d] ", width_, height_);
    966   base::StringAppendF(&str, "attached_to_window: %d ", attached_to_window_);
    967   base::StringAppendF(&str, "hardware_initialized: %d ", hardware_initialized_);
    968   base::StringAppendF(&str, "hardware_failed: %d ", hardware_failed_);
    969   base::StringAppendF(&str,
    970                       "global visible rect: %s ",
    971                       cached_global_visible_rect_.ToString().c_str());
    972   base::StringAppendF(&str,
    973                       "scroll_at_start_of_frame: %s ",
    974                       scroll_at_start_of_frame_.ToString().c_str());
    975   base::StringAppendF(
    976       &str, "scroll_offset_dip: %s ", scroll_offset_dip_.ToString().c_str());
    977   base::StringAppendF(&str,
    978                       "overscroll_rounding_error_: %s ",
    979                       overscroll_rounding_error_.ToString().c_str());
    980   base::StringAppendF(
    981       &str, "on_new_picture_enable: %d ", on_new_picture_enable_);
    982   if (draw_info) {
    983     base::StringAppendF(&str,
    984                         "clip left top right bottom: [%d %d %d %d] ",
    985                         draw_info->clip_left,
    986                         draw_info->clip_top,
    987                         draw_info->clip_right,
    988                         draw_info->clip_bottom);
    989     base::StringAppendF(&str,
    990                         "surface width height: [%d %d] ",
    991                         draw_info->width,
    992                         draw_info->height);
    993     base::StringAppendF(&str, "is_layer: %d ", draw_info->is_layer);
    994   }
    995   return str;
    996 }
    997 
    998 }  // namespace android_webview
    999