content/renderer/pepper/pepper_graphics_2d_host.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 "content/renderer/pepper/pepper_graphics_2d_host.h"
   6
   7 #include "base/bind.h"
   8 #include "base/location.h"
   9 #include "base/logging.h"
  10 #include "base/single_thread_task_runner.h"
  11 #include "base/thread_task_runner_handle.h"
  12 #include "base/trace_event/trace_event.h"
  13 #include "cc/resources/shared_bitmap.h"
  14 #include "cc/resources/texture_mailbox.h"
  15 #include "content/child/child_shared_bitmap_manager.h"
  16 #include "content/public/renderer/render_thread.h"
  17 #include "content/public/renderer/renderer_ppapi_host.h"
  18 #include "content/renderer/pepper/gfx_conversion.h"
  19 #include "content/renderer/pepper/pepper_plugin_instance_impl.h"
  20 #include "content/renderer/pepper/plugin_instance_throttler_impl.h"
  21 #include "content/renderer/pepper/ppb_image_data_impl.h"
  22 #include "content/renderer/render_thread_impl.h"
  23 #include "ppapi/c/pp_bool.h"
  24 #include "ppapi/c/pp_errors.h"
  25 #include "ppapi/c/pp_rect.h"
  26 #include "ppapi/c/pp_resource.h"
  27 #include "ppapi/host/dispatch_host_message.h"
  28 #include "ppapi/host/host_message_context.h"
  29 #include "ppapi/host/ppapi_host.h"
  30 #include "ppapi/proxy/ppapi_messages.h"
  31 #include "ppapi/shared_impl/ppb_view_shared.h"
  32 #include "ppapi/thunk/enter.h"
  33 #include "skia/ext/platform_canvas.h"
  34 #include "third_party/skia/include/core/SkBitmap.h"
  35 #include "ui/gfx/blit.h"
  36 #include "ui/gfx/geometry/point_conversions.h"
  37 #include "ui/gfx/geometry/rect.h"
  38 #include "ui/gfx/geometry/rect_conversions.h"
  39 #include "ui/gfx/geometry/size_conversions.h"
  40 #include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
  41 #include "ui/gfx/skia_util.h"
  42
  43 #if defined(OS_MACOSX)
  44 #include "base/mac/scoped_cftyperef.h"
  45 #endif
  46
  47 using ppapi::thunk::EnterResourceNoLock;
  48 using ppapi::thunk::PPB_ImageData_API;
  49
  50 namespace content {
  51
  52 namespace {
  53
  54 const int64 kOffscreenCallbackDelayMs = 1000 / 30;  // 30 fps
  55
  56 // Converts a rect inside an image of the given dimensions. The rect may be
  57 // NULL to indicate it should be the entire image. If the rect is outside of
  58 // the image, this will do nothing and return false.
  59 bool ValidateAndConvertRect(const PP_Rect* rect,
  60                             int image_width,
  61                             int image_height,
  62                             gfx::Rect* dest) {
  63   if (!rect) {
  64     // Use the entire image area.
  65     *dest = gfx::Rect(0, 0, image_width, image_height);
  66   } else {
  67     // Validate the passed-in area.
  68     if (rect->point.x < 0 || rect->point.y < 0 || rect->size.width <= 0 ||
  69         rect->size.height <= 0)
  70       return false;
  71
  72     // Check the max bounds, being careful of overflow.
  73     if (static_cast<int64>(rect->point.x) +
  74             static_cast<int64>(rect->size.width) >
  75         static_cast<int64>(image_width))
  76       return false;
  77     if (static_cast<int64>(rect->point.y) +
  78             static_cast<int64>(rect->size.height) >
  79         static_cast<int64>(image_height))
  80       return false;
  81
  82     *dest = gfx::Rect(
  83         rect->point.x, rect->point.y, rect->size.width, rect->size.height);
  84   }
  85   return true;
  86 }
  87
  88 // Converts BGRA <-> RGBA.
  89 void ConvertBetweenBGRAandRGBA(const uint32_t* input,
  90                                int pixel_length,
  91                                uint32_t* output) {
  92   for (int i = 0; i < pixel_length; i++) {
  93     const unsigned char* pixel_in =
  94         reinterpret_cast<const unsigned char*>(&input[i]);
  95     unsigned char* pixel_out = reinterpret_cast<unsigned char*>(&output[i]);
  96     pixel_out[0] = pixel_in[2];
  97     pixel_out[1] = pixel_in[1];
  98     pixel_out[2] = pixel_in[0];
  99     pixel_out[3] = pixel_in[3];
 100   }
 101 }
 102
 103 // Converts ImageData from PP_IMAGEDATAFORMAT_BGRA_PREMUL to
 104 // PP_IMAGEDATAFORMAT_RGBA_PREMUL, or reverse. It's assumed that the
 105 // destination image is always mapped (so will have non-NULL data).
 106 void ConvertImageData(PPB_ImageData_Impl* src_image,
 107                       const SkIRect& src_rect,
 108                       PPB_ImageData_Impl* dest_image,
 109                       const SkRect& dest_rect) {
 110   ImageDataAutoMapper auto_mapper(src_image);
 111
 112   DCHECK(src_image->format() != dest_image->format());
 113   DCHECK(PPB_ImageData_Impl::IsImageDataFormatSupported(src_image->format()));
 114   DCHECK(PPB_ImageData_Impl::IsImageDataFormatSupported(dest_image->format()));
 115
 116   const SkBitmap* src_bitmap = src_image->GetMappedBitmap();
 117   const SkBitmap* dest_bitmap = dest_image->GetMappedBitmap();
 118   if (src_rect.width() == src_image->width() &&
 119       dest_rect.width() == dest_image->width()) {
 120     // Fast path if the full line needs to be converted.
 121     ConvertBetweenBGRAandRGBA(
 122         src_bitmap->getAddr32(static_cast<int>(src_rect.fLeft),
 123                               static_cast<int>(src_rect.fTop)),
 124         src_rect.width() * src_rect.height(),
 125         dest_bitmap->getAddr32(static_cast<int>(dest_rect.fLeft),
 126                                static_cast<int>(dest_rect.fTop)));
 127   } else {
 128     // Slow path where we convert line by line.
 129     for (int y = 0; y < src_rect.height(); y++) {
 130       ConvertBetweenBGRAandRGBA(
 131           src_bitmap->getAddr32(static_cast<int>(src_rect.fLeft),
 132                                 static_cast<int>(src_rect.fTop + y)),
 133           src_rect.width(),
 134           dest_bitmap->getAddr32(static_cast<int>(dest_rect.fLeft),
 135                                  static_cast<int>(dest_rect.fTop + y)));
 136     }
 137   }
 138 }
 139
 140 }  // namespace
 141
 142 struct PepperGraphics2DHost::QueuedOperation {
 143   enum Type { PAINT, SCROLL, REPLACE, };
 144
 145   QueuedOperation(Type t)
 146       : type(t), paint_x(0), paint_y(0), scroll_dx(0), scroll_dy(0) {}
 147
 148   Type type;
 149
 150   // Valid when type == PAINT.
 151   scoped_refptr<PPB_ImageData_Impl> paint_image;
 152   int paint_x, paint_y;
 153   gfx::Rect paint_src_rect;
 154
 155   // Valid when type == SCROLL.
 156   gfx::Rect scroll_clip_rect;
 157   int scroll_dx, scroll_dy;
 158
 159   // Valid when type == REPLACE.
 160   scoped_refptr<PPB_ImageData_Impl> replace_image;
 161 };
 162
 163 // static
 164 PepperGraphics2DHost* PepperGraphics2DHost::Create(
 165     RendererPpapiHost* host,
 166     PP_Instance instance,
 167     PP_Resource resource,
 168     const PP_Size& size,
 169     PP_Bool is_always_opaque,
 170     scoped_refptr<PPB_ImageData_Impl> backing_store) {
 171   PepperGraphics2DHost* resource_host =
 172       new PepperGraphics2DHost(host, instance, resource);
 173   if (!resource_host->Init(size.width,
 174                            size.height,
 175                            PP_ToBool(is_always_opaque),
 176                            backing_store)) {
 177     delete resource_host;
 178     return NULL;
 179   }
 180   return resource_host;
 181 }
 182
 183 PepperGraphics2DHost::PepperGraphics2DHost(RendererPpapiHost* host,
 184                                            PP_Instance instance,
 185                                            PP_Resource resource)
 186     : ResourceHost(host->GetPpapiHost(), instance, resource),
 187       renderer_ppapi_host_(host),
 188       bound_instance_(NULL),
 189       need_flush_ack_(false),
 190       offscreen_flush_pending_(false),
 191       is_always_opaque_(false),
 192       scale_(1.0f),
 193       is_running_in_process_(host->IsRunningInProcess()),
 194       texture_mailbox_modified_(true) {}
 195
 196 PepperGraphics2DHost::~PepperGraphics2DHost() {
 197   // Unbind from the instance when destroyed if we're still bound.
 198   if (bound_instance_)
 199     bound_instance_->BindGraphics(bound_instance_->pp_instance(), 0);
 200 }
 201
 202 bool PepperGraphics2DHost::Init(
 203     int width,
 204     int height,
 205     bool is_always_opaque,
 206     scoped_refptr<PPB_ImageData_Impl> backing_store) {
 207   // The underlying PPB_ImageData_Impl will validate the dimensions.
 208   image_data_ = backing_store;
 209   if (!image_data_->Init(PPB_ImageData_Impl::GetNativeImageDataFormat(),
 210                          width,
 211                          height,
 212                          true) ||
 213       !image_data_->Map()) {
 214     image_data_ = NULL;
 215     return false;
 216   }
 217   is_always_opaque_ = is_always_opaque;
 218   scale_ = 1.0f;
 219   return true;
 220 }
 221
 222 int32_t PepperGraphics2DHost::OnResourceMessageReceived(
 223     const IPC::Message& msg,
 224     ppapi::host::HostMessageContext* context) {
 225   PPAPI_BEGIN_MESSAGE_MAP(PepperGraphics2DHost, msg)
 226     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Graphics2D_PaintImageData,
 227                                       OnHostMsgPaintImageData)
 228     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Graphics2D_Scroll,
 229                                       OnHostMsgScroll)
 230     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Graphics2D_ReplaceContents,
 231                                       OnHostMsgReplaceContents)
 232     PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_Graphics2D_Flush,
 233                                         OnHostMsgFlush)
 234     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Graphics2D_SetScale,
 235                                       OnHostMsgSetScale)
 236     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_Graphics2D_ReadImageData,
 237                                       OnHostMsgReadImageData)
 238   PPAPI_END_MESSAGE_MAP()
 239   return PP_ERROR_FAILED;
 240 }
 241
 242 bool PepperGraphics2DHost::IsGraphics2DHost() { return true; }
 243
 244 bool PepperGraphics2DHost::ReadImageData(PP_Resource image,
 245                                          const PP_Point* top_left) {
 246   // Get and validate the image object to paint into.
 247   EnterResourceNoLock<PPB_ImageData_API> enter(image, true);
 248   if (enter.failed())
 249     return false;
 250   PPB_ImageData_Impl* image_resource =
 251       static_cast<PPB_ImageData_Impl*>(enter.object());
 252   if (!PPB_ImageData_Impl::IsImageDataFormatSupported(image_resource->format()))
 253     return false;  // Must be in the right format.
 254
 255   // Validate the bitmap position.
 256   int x = top_left->x;
 257   if (x < 0 ||
 258       static_cast<int64>(x) + static_cast<int64>(image_resource->width()) >
 259           image_data_->width())
 260     return false;
 261   int y = top_left->y;
 262   if (y < 0 ||
 263       static_cast<int64>(y) + static_cast<int64>(image_resource->height()) >
 264           image_data_->height())
 265     return false;
 266
 267   ImageDataAutoMapper auto_mapper(image_resource);
 268   if (!auto_mapper.is_valid())
 269     return false;
 270
 271   SkIRect src_irect = {x, y, x + image_resource->width(),
 272                        y + image_resource->height()};
 273   SkRect dest_rect = {SkIntToScalar(0), SkIntToScalar(0),
 274                       SkIntToScalar(image_resource->width()),
 275                       SkIntToScalar(image_resource->height())};
 276
 277   if (image_resource->format() != image_data_->format()) {
 278     // Convert the image data if the format does not match.
 279     ConvertImageData(image_data_.get(), src_irect, image_resource, dest_rect);
 280   } else {
 281     SkCanvas* dest_canvas = image_resource->GetCanvas();
 282
 283     // We want to replace the contents of the bitmap rather than blend.
 284     SkPaint paint;
 285     paint.setXfermodeMode(SkXfermode::kSrc_Mode);
 286     dest_canvas->drawBitmapRect(
 287         *image_data_->GetMappedBitmap(), src_irect, dest_rect, &paint);
 288   }
 289   return true;
 290 }
 291
 292 bool PepperGraphics2DHost::BindToInstance(
 293     PepperPluginInstanceImpl* new_instance) {
 294   if (new_instance && new_instance->pp_instance() != pp_instance())
 295     return false;  // Can't bind other instance's contexts.
 296   if (bound_instance_ == new_instance)
 297     return true;  // Rebinding the same device, nothing to do.
 298   if (bound_instance_ && new_instance)
 299     return false;  // Can't change a bound device.
 300
 301   if (!new_instance) {
 302     // When the device is detached, we'll not get any more paint callbacks so
 303     // we need to clear the list, but we still want to issue any pending
 304     // callbacks to the plugin.
 305     if (need_flush_ack_)
 306       ScheduleOffscreenFlushAck();
 307   } else {
 308     // Devices being replaced, redraw the plugin.
 309     new_instance->InvalidateRect(gfx::Rect());
 310   }
 311
 312   cached_bitmap_.reset();
 313   texture_mailbox_modified_ = true;
 314
 315   bound_instance_ = new_instance;
 316   return true;
 317 }
 318
 319 // The |backing_bitmap| must be clipped to the |plugin_rect| to avoid painting
 320 // outside the plugin area. This can happen if the plugin has been resized since
 321 // PaintImageData verified the image is within the plugin size.
 322 void PepperGraphics2DHost::Paint(blink::WebCanvas* canvas,
 323                                  const gfx::Rect& plugin_rect,
 324                                  const gfx::Rect& paint_rect) {
 325   TRACE_EVENT0("pepper", "PepperGraphics2DHost::Paint");
 326   ImageDataAutoMapper auto_mapper(image_data_.get());
 327   const SkBitmap& backing_bitmap = *image_data_->GetMappedBitmap();
 328
 329   gfx::Rect invalidate_rect = plugin_rect;
 330   invalidate_rect.Intersect(paint_rect);
 331   SkRect sk_invalidate_rect = gfx::RectToSkRect(invalidate_rect);
 332   SkAutoCanvasRestore auto_restore(canvas, true);
 333   canvas->clipRect(sk_invalidate_rect);
 334   gfx::Size pixel_image_size(image_data_->width(), image_data_->height());
 335   gfx::Size image_size =
 336       gfx::ToFlooredSize(gfx::ScaleSize(pixel_image_size, scale_));
 337
 338   PepperPluginInstance* plugin_instance =
 339       renderer_ppapi_host_->GetPluginInstance(pp_instance());
 340   if (!plugin_instance)
 341     return;
 342   if (plugin_instance->IsFullPagePlugin()) {
 343     // When we're resizing a window with a full-frame plugin, the plugin may
 344     // not yet have bound a new device, which will leave parts of the
 345     // background exposed if the window is getting larger. We want this to
 346     // show white (typically less jarring) rather than black or uninitialized.
 347     // We don't do this for non-full-frame plugins since we specifically want
 348     // the page background to show through.
 349     SkAutoCanvasRestore auto_restore(canvas, true);
 350     SkRect image_data_rect =
 351         gfx::RectToSkRect(gfx::Rect(plugin_rect.origin(), image_size));
 352     canvas->clipRect(image_data_rect, SkRegion::kDifference_Op);
 353
 354     SkPaint paint;
 355     paint.setXfermodeMode(SkXfermode::kSrc_Mode);
 356     paint.setColor(SK_ColorWHITE);
 357     canvas->drawRect(sk_invalidate_rect, paint);
 358   }
 359
 360   SkBitmap image;
 361   // Copy to device independent bitmap when target canvas doesn't support
 362   // platform paint.
 363   if (!skia::SupportsPlatformPaint(canvas))
 364     backing_bitmap.copyTo(&image, kN32_SkColorType);
 365   else
 366     image = backing_bitmap;
 367
 368   SkPaint paint;
 369   if (is_always_opaque_) {
 370     // When we know the device is opaque, we can disable blending for slightly
 371     // more optimized painting.
 372     paint.setXfermodeMode(SkXfermode::kSrc_Mode);
 373   }
 374
 375   SkPoint origin;
 376   origin.set(SkIntToScalar(plugin_rect.x()), SkIntToScalar(plugin_rect.y()));
 377
 378   SkPoint pixel_origin = origin;
 379
 380   if (scale_ != 1.0f && scale_ > 0.0f) {
 381     canvas->scale(scale_, scale_);
 382     pixel_origin.set(pixel_origin.x() * (1.0f / scale_),
 383                      pixel_origin.y() * (1.0f / scale_));
 384   }
 385   canvas->drawBitmap(image, pixel_origin.x(), pixel_origin.y(), &paint);
 386 }
 387
 388 void PepperGraphics2DHost::ViewInitiatedPaint() {
 389   TRACE_EVENT0("pepper", "PepperGraphics2DHost::ViewInitiatedPaint");
 390   if (need_flush_ack_) {
 391     SendFlushAck();
 392     need_flush_ack_ = false;
 393   }
 394 }
 395
 396 void PepperGraphics2DHost::SetScale(float scale) { scale_ = scale; }
 397
 398 float PepperGraphics2DHost::GetScale() const { return scale_; }
 399
 400 bool PepperGraphics2DHost::IsAlwaysOpaque() const { return is_always_opaque_; }
 401
 402 PPB_ImageData_Impl* PepperGraphics2DHost::ImageData() {
 403   return image_data_.get();
 404 }
 405
 406 gfx::Size PepperGraphics2DHost::Size() const {
 407   if (!image_data_.get())
 408     return gfx::Size();
 409   return gfx::Size(image_data_->width(), image_data_->height());
 410 }
 411
 412 void PepperGraphics2DHost::ClearCache() {
 413   cached_bitmap_.reset();
 414 }
 415
 416 int32_t PepperGraphics2DHost::OnHostMsgPaintImageData(
 417     ppapi::host::HostMessageContext* context,
 418     const ppapi::HostResource& image_data,
 419     const PP_Point& top_left,
 420     bool src_rect_specified,
 421     const PP_Rect& src_rect) {
 422   EnterResourceNoLock<PPB_ImageData_API> enter(image_data.host_resource(),
 423                                                true);
 424   if (enter.failed())
 425     return PP_ERROR_BADRESOURCE;
 426   PPB_ImageData_Impl* image_resource =
 427       static_cast<PPB_ImageData_Impl*>(enter.object());
 428
 429   QueuedOperation operation(QueuedOperation::PAINT);
 430   operation.paint_image = image_resource;
 431   if (!ValidateAndConvertRect(src_rect_specified ? &src_rect : NULL,
 432                               image_resource->width(),
 433                               image_resource->height(),
 434                               &operation.paint_src_rect))
 435     return PP_ERROR_BADARGUMENT;
 436
 437   // Validate the bitmap position using the previously-validated rect, there
 438   // should be no painted area outside of the image.
 439   int64 x64 = static_cast<int64>(top_left.x);
 440   int64 y64 = static_cast<int64>(top_left.y);
 441   if (x64 + static_cast<int64>(operation.paint_src_rect.x()) < 0 ||
 442       x64 + static_cast<int64>(operation.paint_src_rect.right()) >
 443           image_data_->width())
 444     return PP_ERROR_BADARGUMENT;
 445   if (y64 + static_cast<int64>(operation.paint_src_rect.y()) < 0 ||
 446       y64 + static_cast<int64>(operation.paint_src_rect.bottom()) >
 447           image_data_->height())
 448     return PP_ERROR_BADARGUMENT;
 449   operation.paint_x = top_left.x;
 450   operation.paint_y = top_left.y;
 451
 452   queued_operations_.push_back(operation);
 453   return PP_OK;
 454 }
 455
 456 int32_t PepperGraphics2DHost::OnHostMsgScroll(
 457     ppapi::host::HostMessageContext* context,
 458     bool clip_specified,
 459     const PP_Rect& clip,
 460     const PP_Point& amount) {
 461   QueuedOperation operation(QueuedOperation::SCROLL);
 462   if (!ValidateAndConvertRect(clip_specified ? &clip : NULL,
 463                               image_data_->width(),
 464                               image_data_->height(),
 465                               &operation.scroll_clip_rect))
 466     return PP_ERROR_BADARGUMENT;
 467
 468   // If we're being asked to scroll by more than the clip rect size, just
 469   // ignore this scroll command and say it worked.
 470   int32 dx = amount.x;
 471   int32 dy = amount.y;
 472   if (dx <= -image_data_->width() || dx >= image_data_->width() ||
 473       dy <= -image_data_->height() || dy >= image_data_->height())
 474     return PP_ERROR_BADARGUMENT;
 475
 476   operation.scroll_dx = dx;
 477   operation.scroll_dy = dy;
 478
 479   queued_operations_.push_back(operation);
 480   return PP_OK;
 481 }
 482
 483 int32_t PepperGraphics2DHost::OnHostMsgReplaceContents(
 484     ppapi::host::HostMessageContext* context,
 485     const ppapi::HostResource& image_data) {
 486   EnterResourceNoLock<PPB_ImageData_API> enter(image_data.host_resource(),
 487                                                true);
 488   if (enter.failed())
 489     return PP_ERROR_BADRESOURCE;
 490   PPB_ImageData_Impl* image_resource =
 491       static_cast<PPB_ImageData_Impl*>(enter.object());
 492
 493   if (!PPB_ImageData_Impl::IsImageDataFormatSupported(image_resource->format()))
 494     return PP_ERROR_BADARGUMENT;
 495
 496   if (image_resource->width() != image_data_->width() ||
 497       image_resource->height() != image_data_->height())
 498     return PP_ERROR_BADARGUMENT;
 499
 500   QueuedOperation operation(QueuedOperation::REPLACE);
 501   operation.replace_image = image_resource;
 502   queued_operations_.push_back(operation);
 503   return PP_OK;
 504 }
 505
 506 int32_t PepperGraphics2DHost::OnHostMsgFlush(
 507     ppapi::host::HostMessageContext* context) {
 508   // Don't allow more than one pending flush at a time.
 509   if (HasPendingFlush())
 510     return PP_ERROR_INPROGRESS;
 511
 512   PP_Resource old_image_data = 0;
 513   flush_reply_context_ = context->MakeReplyMessageContext();
 514   if (is_running_in_process_)
 515     return Flush(NULL);
 516
 517   // Reuse image data when running out of process.
 518   int32_t result = Flush(&old_image_data);
 519
 520   if (old_image_data) {
 521     // If the Graphics2D has an old image data it's not using any more, send
 522     // it back to the plugin for possible re-use. See ppb_image_data_proxy.cc
 523     // for a description how this process works.
 524     ppapi::HostResource old_image_data_host_resource;
 525     old_image_data_host_resource.SetHostResource(pp_instance(), old_image_data);
 526     host()->Send(new PpapiMsg_PPBImageData_NotifyUnusedImageData(
 527         ppapi::API_ID_PPB_IMAGE_DATA, old_image_data_host_resource));
 528   }
 529
 530   return result;
 531 }
 532
 533 int32_t PepperGraphics2DHost::OnHostMsgSetScale(
 534     ppapi::host::HostMessageContext* context,
 535     float scale) {
 536   if (scale > 0.0f) {
 537     scale_ = scale;
 538     return PP_OK;
 539   }
 540   return PP_ERROR_BADARGUMENT;
 541 }
 542
 543 int32_t PepperGraphics2DHost::OnHostMsgReadImageData(
 544     ppapi::host::HostMessageContext* context,
 545     PP_Resource image,
 546     const PP_Point& top_left) {
 547   context->reply_msg = PpapiPluginMsg_Graphics2D_ReadImageDataAck();
 548   return ReadImageData(image, &top_left) ? PP_OK : PP_ERROR_FAILED;
 549 }
 550
 551 void PepperGraphics2DHost::ReleaseCallback(scoped_ptr<cc::SharedBitmap> bitmap,
 552                                            const gfx::Size& bitmap_size,
 553                                            uint32 sync_point,
 554                                            bool lost_resource) {
 555   cached_bitmap_.reset();
 556   // Only keep around a cached bitmap if the plugin is currently drawing (has
 557   // need_flush_ack_ set).
 558   if (need_flush_ack_ && bound_instance_)
 559     cached_bitmap_ = bitmap.Pass();
 560   cached_bitmap_size_ = bitmap_size;
 561 }
 562
 563 bool PepperGraphics2DHost::PrepareTextureMailbox(
 564     cc::TextureMailbox* mailbox,
 565     scoped_ptr<cc::SingleReleaseCallback>* release_callback) {
 566   if (!texture_mailbox_modified_)
 567     return false;
 568   // TODO(jbauman): Send image_data_ through mailbox to avoid copy.
 569   gfx::Size pixel_image_size(image_data_->width(), image_data_->height());
 570   scoped_ptr<cc::SharedBitmap> shared_bitmap;
 571   if (cached_bitmap_) {
 572     if (cached_bitmap_size_ == pixel_image_size)
 573       shared_bitmap = cached_bitmap_.Pass();
 574     else
 575       cached_bitmap_.reset();
 576   }
 577   if (!shared_bitmap) {
 578     shared_bitmap = RenderThreadImpl::current()
 579                         ->shared_bitmap_manager()
 580                         ->AllocateSharedBitmap(pixel_image_size);
 581   }
 582   if (!shared_bitmap)
 583     return false;
 584   void* src = image_data_->Map();
 585   memcpy(shared_bitmap->pixels(),
 586          src,
 587          cc::SharedBitmap::CheckedSizeInBytes(pixel_image_size));
 588   image_data_->Unmap();
 589
 590   *mailbox = cc::TextureMailbox(shared_bitmap.get(), pixel_image_size);
 591   *release_callback = cc::SingleReleaseCallback::Create(
 592       base::Bind(&PepperGraphics2DHost::ReleaseCallback,
 593                  this->AsWeakPtr(),
 594                  base::Passed(&shared_bitmap),
 595                  pixel_image_size));
 596   texture_mailbox_modified_ = false;
 597   return true;
 598 }
 599
 600 void PepperGraphics2DHost::AttachedToNewLayer() {
 601   texture_mailbox_modified_ = true;
 602 }
 603
 604 int32_t PepperGraphics2DHost::Flush(PP_Resource* old_image_data) {
 605   bool done_replace_contents = false;
 606   bool no_update_visible = true;
 607   bool is_plugin_visible = true;
 608   for (size_t i = 0; i < queued_operations_.size(); i++) {
 609     QueuedOperation& operation = queued_operations_[i];
 610     gfx::Rect op_rect;
 611     switch (operation.type) {
 612       case QueuedOperation::PAINT:
 613         ExecutePaintImageData(operation.paint_image.get(),
 614                               operation.paint_x,
 615                               operation.paint_y,
 616                               operation.paint_src_rect,
 617                               &op_rect);
 618         break;
 619       case QueuedOperation::SCROLL:
 620         ExecuteScroll(operation.scroll_clip_rect,
 621                       operation.scroll_dx,
 622                       operation.scroll_dy,
 623                       &op_rect);
 624         break;
 625       case QueuedOperation::REPLACE:
 626         // Since the out parameter |old_image_data| takes ownership of the
 627         // reference, if there are more than one ReplaceContents calls queued
 628         // the first |old_image_data| will get overwritten and leaked. So we
 629         // only supply this for the first call.
 630         ExecuteReplaceContents(operation.replace_image.get(),
 631                                &op_rect,
 632                                done_replace_contents ? NULL : old_image_data);
 633         done_replace_contents = true;
 634         break;
 635     }
 636
 637     // For correctness with accelerated compositing, we must issue an invalidate
 638     // on the full op_rect even if it is partially or completely off-screen.
 639     // However, if we issue an invalidate for a clipped-out region, WebKit will
 640     // do nothing and we won't get any ViewFlushedPaint calls, leaving our
 641     // callback stranded. So we still need to check whether the repainted area
 642     // is visible to determine how to deal with the callback.
 643     if (bound_instance_ && !op_rect.IsEmpty()) {
 644       gfx::Point scroll_delta(operation.scroll_dx, operation.scroll_dy);
 645       if (!ConvertToLogicalPixels(scale_,
 646                                   &op_rect,
 647                                   operation.type == QueuedOperation::SCROLL
 648                                       ? &scroll_delta
 649                                       : NULL)) {
 650         // Conversion requires falling back to InvalidateRect.
 651         operation.type = QueuedOperation::PAINT;
 652       }
 653
 654       gfx::Rect clip = PP_ToGfxRect(bound_instance_->view_data().clip_rect);
 655       is_plugin_visible = !clip.IsEmpty();
 656
 657       // Set |no_update_visible| to false if the change overlaps the visible
 658       // area.
 659       if (!gfx::IntersectRects(clip, op_rect).IsEmpty()) {
 660         no_update_visible = false;
 661       }
 662
 663       // Notify the plugin of the entire change (op_rect), even if it is
 664       // partially or completely off-screen.
 665       if (operation.type == QueuedOperation::SCROLL) {
 666         bound_instance_->ScrollRect(
 667             scroll_delta.x(), scroll_delta.y(), op_rect);
 668       } else {
 669         if (!op_rect.IsEmpty())
 670           bound_instance_->InvalidateRect(op_rect);
 671       }
 672       texture_mailbox_modified_ = true;
 673     }
 674   }
 675   queued_operations_.clear();
 676
 677   if (!bound_instance_) {
 678     // As promised in the API, we always schedule callback when unbound.
 679     ScheduleOffscreenFlushAck();
 680   } else if (no_update_visible && is_plugin_visible &&
 681              bound_instance_->view_data().is_page_visible) {
 682     // There's nothing visible to invalidate so just schedule the callback to
 683     // execute in the next round of the message loop.
 684     ScheduleOffscreenFlushAck();
 685   } else {
 686     need_flush_ack_ = true;
 687   }
 688
 689   if (bound_instance_ && bound_instance_->throttler() &&
 690       bound_instance_->throttler()->needs_representative_keyframe()) {
 691     bound_instance_->throttler()->OnImageFlush(image_data_->GetMappedBitmap());
 692   }
 693
 694   return PP_OK_COMPLETIONPENDING;
 695 }
 696
 697 void PepperGraphics2DHost::ExecutePaintImageData(PPB_ImageData_Impl* image,
 698                                                  int x,
 699                                                  int y,
 700                                                  const gfx::Rect& src_rect,
 701                                                  gfx::Rect* invalidated_rect) {
 702   // Ensure the source image is mapped to read from it.
 703   ImageDataAutoMapper auto_mapper(image);
 704   if (!auto_mapper.is_valid())
 705     return;
 706
 707   // Portion within the source image to cut out.
 708   SkIRect src_irect = {src_rect.x(), src_rect.y(), src_rect.right(),
 709                        src_rect.bottom()};
 710
 711   // Location within the backing store to copy to.
 712   *invalidated_rect = src_rect;
 713   invalidated_rect->Offset(x, y);
 714   SkRect dest_rect = {SkIntToScalar(invalidated_rect->x()),
 715                       SkIntToScalar(invalidated_rect->y()),
 716                       SkIntToScalar(invalidated_rect->right()),
 717                       SkIntToScalar(invalidated_rect->bottom())};
 718
 719   if (image->format() != image_data_->format()) {
 720     // Convert the image data if the format does not match.
 721     ConvertImageData(image, src_irect, image_data_.get(), dest_rect);
 722   } else {
 723     // We're guaranteed to have a mapped canvas since we mapped it in Init().
 724     SkCanvas* backing_canvas = image_data_->GetCanvas();
 725
 726     // We want to replace the contents of the bitmap rather than blend.
 727     SkPaint paint;
 728     paint.setXfermodeMode(SkXfermode::kSrc_Mode);
 729     backing_canvas->drawBitmapRect(
 730         *image->GetMappedBitmap(), src_irect, dest_rect, &paint);
 731   }
 732 }
 733
 734 void PepperGraphics2DHost::ExecuteScroll(const gfx::Rect& clip,
 735                                          int dx,
 736                                          int dy,
 737                                          gfx::Rect* invalidated_rect) {
 738   gfx::ScrollCanvas(image_data_->GetCanvas(), clip, gfx::Vector2d(dx, dy));
 739   *invalidated_rect = clip;
 740 }
 741
 742 void PepperGraphics2DHost::ExecuteReplaceContents(PPB_ImageData_Impl* image,
 743                                                   gfx::Rect* invalidated_rect,
 744                                                   PP_Resource* old_image_data) {
 745   if (image->format() != image_data_->format()) {
 746     DCHECK(image->width() == image_data_->width() &&
 747            image->height() == image_data_->height());
 748     // Convert the image data if the format does not match.
 749     SkIRect src_irect = {0, 0, image->width(), image->height()};
 750     SkRect dest_rect = {SkIntToScalar(0), SkIntToScalar(0),
 751                         SkIntToScalar(image_data_->width()),
 752                         SkIntToScalar(image_data_->height())};
 753     ConvertImageData(image, src_irect, image_data_.get(), dest_rect);
 754   } else {
 755     // The passed-in image may not be mapped in our process, and we need to
 756     // guarantee that the current backing store is always mapped.
 757     if (!image->Map())
 758       return;
 759
 760     if (old_image_data)
 761       *old_image_data = image_data_->GetReference();
 762     image_data_ = image;
 763   }
 764   *invalidated_rect =
 765       gfx::Rect(0, 0, image_data_->width(), image_data_->height());
 766 }
 767
 768 void PepperGraphics2DHost::SendFlushAck() {
 769   host()->SendReply(flush_reply_context_, PpapiPluginMsg_Graphics2D_FlushAck());
 770 }
 771
 772 void PepperGraphics2DHost::SendOffscreenFlushAck() {
 773   DCHECK(offscreen_flush_pending_);
 774
 775   // We must clear this flag before issuing the callback. It will be
 776   // common for the plugin to issue another invalidate in response to a flush
 777   // callback, and we don't want to think that a callback is already pending.
 778   offscreen_flush_pending_ = false;
 779   SendFlushAck();
 780 }
 781
 782 void PepperGraphics2DHost::ScheduleOffscreenFlushAck() {
 783   offscreen_flush_pending_ = true;
 784   base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
 785       FROM_HERE,
 786       base::Bind(&PepperGraphics2DHost::SendOffscreenFlushAck, AsWeakPtr()),
 787       base::TimeDelta::FromMilliseconds(kOffscreenCallbackDelayMs));
 788 }
 789
 790 bool PepperGraphics2DHost::HasPendingFlush() const {
 791   return need_flush_ack_ || offscreen_flush_pending_;
 792 }
 793
 794 // static
 795 bool PepperGraphics2DHost::ConvertToLogicalPixels(float scale,
 796                                                   gfx::Rect* op_rect,
 797                                                   gfx::Point* delta) {
 798   if (scale == 1.0f || scale <= 0.0f)
 799     return true;
 800
 801   gfx::Rect original_rect = *op_rect;
 802   // Take the enclosing rectangle after scaling so a rectangle scaled down then
 803   // scaled back up by the inverse scale would fully contain the entire area
 804   // affected by the original rectangle.
 805   *op_rect = gfx::ScaleToEnclosingRect(*op_rect, scale);
 806   if (delta) {
 807     gfx::Point original_delta = *delta;
 808     float inverse_scale = 1.0f / scale;
 809     *delta = gfx::ToFlooredPoint(gfx::ScalePoint(*delta, scale));
 810
 811     gfx::Rect inverse_scaled_rect =
 812         gfx::ScaleToEnclosingRect(*op_rect, inverse_scale);
 813     if (original_rect != inverse_scaled_rect)
 814       return false;
 815     gfx::Point inverse_scaled_point =
 816         gfx::ToFlooredPoint(gfx::ScalePoint(*delta, inverse_scale));
 817     if (original_delta != inverse_scaled_point)
 818       return false;
 819   }
 820
 821   return true;
 822 }
 823
 824 }  // namespace content