DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (c221a75fbf29)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "ShareableCanvasRenderer.h"

#include "GLContext.h"        // for GLContext
#include "GLScreenBuffer.h"   // for GLScreenBuffer
#include "SharedSurfaceGL.h"  // for SurfaceFactory_GLTexture, etc
#include "gfxUtils.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/layers/AsyncCanvasRenderer.h"
#include "mozilla/layers/TextureClientSharedSurface.h"
#include "mozilla/layers/CompositableForwarder.h"

using namespace mozilla::gfx;

namespace mozilla {
namespace layers {

ShareableCanvasRenderer::ShareableCanvasRenderer()
    : mCanvasClient(nullptr),
      mFactory(nullptr),
      mFlags(TextureFlags::NO_FLAGS) {
  MOZ_COUNT_CTOR(ShareableCanvasRenderer);
}

ShareableCanvasRenderer::~ShareableCanvasRenderer() {
  MOZ_COUNT_DTOR(ShareableCanvasRenderer);

  Destroy();
}

void ShareableCanvasRenderer::Initialize(const CanvasInitializeData& aData) {
  CopyableCanvasRenderer::Initialize(aData);

  mCanvasClient = nullptr;

  if (!mGLContext) return;

  gl::GLScreenBuffer* screen = mGLContext->Screen();
  MOZ_ASSERT(screen);
  gl::SurfaceCaps caps = screen->mCaps;

  auto forwarder = GetForwarder();

  mFlags = TextureFlags::ORIGIN_BOTTOM_LEFT;
  if (!aData.mIsGLAlphaPremult) {
    mFlags |= TextureFlags::NON_PREMULTIPLIED;
  }

  UniquePtr<gl::SurfaceFactory> factory =
      gl::GLScreenBuffer::CreateFactory(mGLContext, caps, forwarder, mFlags);
  if (factory) {
    screen->Morph(std::move(factory));
  }
}

void ShareableCanvasRenderer::ClearCachedResources() {
  CopyableCanvasRenderer::ClearCachedResources();

  if (mCanvasClient) {
    mCanvasClient->Clear();
  }
}

void ShareableCanvasRenderer::Destroy() {
  CopyableCanvasRenderer::Destroy();

  if (mCanvasClient) {
    mCanvasClient->OnDetach();
    mCanvasClient = nullptr;
  }
}

bool ShareableCanvasRenderer::UpdateTarget(DrawTarget* aDestTarget) {
  MOZ_ASSERT(aDestTarget);
  if (!aDestTarget) {
    return false;
  }

  RefPtr<SourceSurface> surface;

  if (!mGLContext) {
    AutoReturnSnapshot autoReturn;

    if (mAsyncRenderer) {
      surface = mAsyncRenderer->GetSurface();
    } else if (mBufferProvider) {
      surface = mBufferProvider->BorrowSnapshot();
      autoReturn.mSnapshot = &surface;
      autoReturn.mBufferProvider = mBufferProvider;
    }

    MOZ_ASSERT(surface);
    if (!surface) {
      return false;
    }

    aDestTarget->CopySurface(surface, IntRect(0, 0, mSize.width, mSize.height),
                             IntPoint(0, 0));
    return true;
  }

  gl::SharedSurface* frontbuffer = nullptr;

  gl::GLScreenBuffer* screen = mGLContext->Screen();
  const auto& front = screen->Front();
  if (front) {
    frontbuffer = front->Surf();
  }

  if (!frontbuffer) {
    NS_WARNING("Null frame received.");
    return false;
  }

  IntSize readSize(frontbuffer->mSize);
  SurfaceFormat format =
      mOpaque ? SurfaceFormat::B8G8R8X8 : SurfaceFormat::B8G8R8A8;
  bool needsPremult = frontbuffer->mHasAlpha && !mIsAlphaPremultiplied;

  // Try to read back directly into aDestTarget's output buffer
  uint8_t* destData;
  IntSize destSize;
  int32_t destStride;
  SurfaceFormat destFormat;
  if (aDestTarget->LockBits(&destData, &destSize, &destStride, &destFormat)) {
    if (destSize == readSize && destFormat == format) {
      RefPtr<DataSourceSurface> data = Factory::CreateWrappingDataSourceSurface(
          destData, destStride, destSize, destFormat);
      if (!mGLContext->Readback(frontbuffer, data)) {
        aDestTarget->ReleaseBits(destData);
        return false;
      }
      if (needsPremult) {
        gfxUtils::PremultiplyDataSurface(data, data);
      }
      aDestTarget->ReleaseBits(destData);
      return true;
    }
    aDestTarget->ReleaseBits(destData);
  }

  RefPtr<DataSourceSurface> resultSurf = GetTempSurface(readSize, format);
  // There will already be a warning from inside of GetTempSurface, but
  // it doesn't hurt to complain:
  if (NS_WARN_IF(!resultSurf)) {
    return false;
  }

  // Readback handles Flush/MarkDirty.
  if (!mGLContext->Readback(frontbuffer, resultSurf)) {
    return false;
  }
  if (needsPremult) {
    gfxUtils::PremultiplyDataSurface(resultSurf, resultSurf);
  }

  aDestTarget->CopySurface(resultSurf,
                           IntRect(0, 0, readSize.width, readSize.height),
                           IntPoint(0, 0));

  return true;
}

CanvasClient::CanvasClientType ShareableCanvasRenderer::GetCanvasClientType() {
  if (mAsyncRenderer) {
    return CanvasClient::CanvasClientAsync;
  }

  if (mGLContext) {
    return CanvasClient::CanvasClientTypeShSurf;
  }
  return CanvasClient::CanvasClientSurface;
}

void ShareableCanvasRenderer::UpdateCompositableClient(
    wr::RenderRoot aRenderRoot) {
  if (!CreateCompositable()) {
    return;
  }

  if (mCanvasClient && mAsyncRenderer) {
    mCanvasClient->UpdateAsync(mAsyncRenderer);
  }

  if (!IsDirty()) {
    return;
  }
  ResetDirty();

  FirePreTransactionCallback();
  if (mBufferProvider && mBufferProvider->GetTextureClient()) {
    if (!mBufferProvider->SetKnowsCompositor(GetForwarder())) {
      gfxCriticalNote << "BufferProvider::SetForwarder failed";
      return;
    }
    mCanvasClient->UpdateFromTexture(mBufferProvider->GetTextureClient(),
                                     aRenderRoot);
  } else {
    mCanvasClient->Update(gfx::IntSize(mSize.width, mSize.height), this,
                          aRenderRoot);
  }

  FireDidTransactionCallback();

  mCanvasClient->Updated(aRenderRoot);
}

}  // namespace layers
}  // namespace mozilla