author Lee Salzman <>
Mon, 06 Nov 2017 20:19:46 -0500
changeset 390416 e0ad40dad503e8d176512140c32d05513a57e4a9
parent 389121 5f74d262924171a8fa0b4483a64f4cac34c4c9b8
child 397950 c5f975c4bfc7834fce3677a9e2547168bef53cd3
permissions -rw-r--r--
Bug 1403198 - send font descriptors to WR instead of raw fonts where possible. r=jrmuizel MozReview-Commit-ID: DYcaO3fE1fc

/* -*- 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 */


#include "mozilla/layers/WebRenderMessages.h"
#include "mozilla/webrender/WebRenderTypes.h"

namespace mozilla {
namespace ipc {
class IShmemAllocator;
namespace wr {

/// ShmSegmentsWriter pushes bytes in a sequence of fixed size shmems for small
/// allocations and creates dedicated shmems for large allocations.
class ShmSegmentsWriter {
  ShmSegmentsWriter(ipc::IShmemAllocator* aAllocator, size_t aChunkSize);

  layers::OffsetRange Write(Range<uint8_t> aBytes);

  template<typename T>
  layers::OffsetRange WriteAsBytes(Range<T> aValues)
    return Write(Range<uint8_t>((uint8_t*)aValues.begin().get(), aValues.length() * sizeof(T)));

  void Flush(nsTArray<ipc::Shmem>& aSmallAllocs, nsTArray<ipc::Shmem>& aLargeAllocs);

  void Clear();

  bool AllocChunk();
  layers::OffsetRange AllocLargeChunk(size_t aSize);

  nsTArray<ipc::Shmem> mSmallAllocs;
  nsTArray<ipc::Shmem> mLargeAllocs;
  ipc::IShmemAllocator* mShmAllocator;
  size_t mCursor;
  size_t mChunkSize;

class ShmSegmentsReader {
  ShmSegmentsReader(const nsTArray<ipc::Shmem>& aSmallShmems,
                    const nsTArray<ipc::Shmem>& aLargeShmems);

  bool Read(const layers::OffsetRange& aRange, wr::Vec_u8& aInto);

  bool ReadLarge(const layers::OffsetRange& aRange, wr::Vec_u8& aInto);

  const nsTArray<ipc::Shmem>& mSmallAllocs;
  const nsTArray<ipc::Shmem>& mLargeAllocs;
  size_t mChunkSize;

class IpcResourceUpdateQueue {
  // Because we are using shmems, the size should be a multiple of the page size.
  // Each shmem has two guard pages, and the minimum shmem size (at least one Windows)
  // is 64k which is already quite large for a lot of the resources we use here.
  // So we pick 64k - 2 * 4k = 57344 bytes as the defautl alloc
  explicit IpcResourceUpdateQueue(ipc::IShmemAllocator* aAllocator, size_t aChunkSize = 57344);

  bool AddImage(wr::ImageKey aKey,
                const ImageDescriptor& aDescriptor,
                Range<uint8_t> aBytes);

  bool AddBlobImage(wr::ImageKey aKey,
                    const ImageDescriptor& aDescriptor,
                    Range<uint8_t> aBytes);

  void AddExternalImage(wr::ExternalImageId aExtId, wr::ImageKey aKey);

  bool UpdateImageBuffer(wr::ImageKey aKey,
                         const ImageDescriptor& aDescriptor,
                         Range<uint8_t> aBytes);

  bool UpdateBlobImage(wr::ImageKey aKey,
                       const ImageDescriptor& aDescriptor,
                       Range<uint8_t> aBytes,
                       ImageIntRect aDirtyRect);

  void UpdateExternalImage(ImageKey aKey,
                           const ImageDescriptor& aDescriptor,
                           ExternalImageId aExtID,
                           wr::WrExternalImageBufferType aBufferType,
                           uint8_t aChannelIndex = 0);

  void DeleteImage(wr::ImageKey aKey);

  bool AddRawFont(wr::FontKey aKey, Range<uint8_t> aBytes, uint32_t aIndex);

  bool AddFontDescriptor(wr::FontKey aKey, Range<uint8_t> aBytes, uint32_t aIndex);

  void DeleteFont(wr::FontKey aKey);

  void AddFontInstance(wr::FontInstanceKey aKey,
                       wr::FontKey aFontKey,
                       float aGlyphSize,
                       const wr::FontInstanceOptions* aOptions,
                       const wr::FontInstancePlatformOptions* aPlatformOptions,
                       Range<const gfx::FontVariation> aVariations);

  void DeleteFontInstance(wr::FontInstanceKey aKey);

  void Clear();

  void Flush(nsTArray<layers::OpUpdateResource>& aUpdates,
             nsTArray<ipc::Shmem>& aSmallAllocs,
             nsTArray<ipc::Shmem>& aLargeAllocs);

  ShmSegmentsWriter mWriter;
  nsTArray<layers::OpUpdateResource> mUpdates;

} // namespace
} // namespace