/* 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/. */

#ifndef MOZILLA_LAYERS_COMPOSITORTYPES_H
#define MOZILLA_LAYERS_COMPOSITORTYPES_H

#include <iosfwd>
#include <stdint.h>       // for uint32_t
#include <sys/types.h>    // for int32_t
#include "LayersTypes.h"  // for LayersBackend, etc
#include "nsXULAppAPI.h"  // for GeckoProcessType, etc
#include "mozilla/gfx/Types.h"
#include "mozilla/layers/SyncObject.h"

#include "mozilla/TypedEnumBits.h"

namespace mozilla {
namespace layers {

/**
 * Flags used by texture clients and texture hosts. These are passed from client
 * side to host side when textures and compositables are created. Usually set
 * by the compositableCient, they may be modified by either the compositable or
 * texture clients.
 */
enum class TextureFlags : uint32_t {
  NO_FLAGS = 0,
  // Use nearest-neighbour texture filtering (as opposed to linear filtering).
  USE_NEAREST_FILTER = 1 << 0,
  // The compositor assumes everything is origin-top-left by default.
  ORIGIN_BOTTOM_LEFT = 1 << 1,
  // Force the texture to be represented using a single tile (note that this
  // means tiled textures, not tiled layers).
  DISALLOW_BIGIMAGE = 1 << 2,
  // The buffer will be treated as if the RB bytes are swapped.
  // This is useful for rendering using Cairo/Thebes, because there is no
  // BGRX Android pixel format, and so we have to do byte swapping.
  //
  // For example, if the GraphicBuffer has an Android pixel format of
  // PIXEL_FORMAT_RGBA_8888 and isRBSwapped is true, when it is sampled
  // (for example, with GL), a BGRA shader should be used.
  RB_SWAPPED = 1 << 3,
  // Data in this texture has not been alpha-premultiplied.
  // XXX - Apparently only used with ImageClient/Host
  NON_PREMULTIPLIED = 1 << 4,
  // The TextureClient should be recycled with recycle callback when no longer
  // in used. When the texture is used in host side, ref count of TextureClient
  // is transparently added by ShadowLayerForwarder or ImageBridgeChild.
  RECYCLE = 1 << 5,
  // If DEALLOCATE_CLIENT is set, the shared data is deallocated on the
  // client side and requires some extra synchronizaion to ensure race-free
  // deallocation.
  // The default behaviour is to deallocate on the host side.
  DEALLOCATE_CLIENT = 1 << 6,
  DEALLOCATE_SYNC = 1 << 6,  // XXX - make it a separate flag.
  // After being shared ith the compositor side, an immutable texture is never
  // modified, it can only be read. It is safe to not Lock/Unlock immutable
  // textures.
  IMMUTABLE = 1 << 9,
  // The contents of the texture must be uploaded or copied immediately
  // during the transaction, because the producer may want to write
  // to it again.
  IMMEDIATE_UPLOAD = 1 << 10,
  // The texture is part of a component-alpha pair
  COMPONENT_ALPHA = 1 << 11,
  // The texture is being allocated for a compositor that no longer exists.
  // This flag is only used in the parent process.
  INVALID_COMPOSITOR = 1 << 12,
  // The texture was created by converting from YCBCR to RGB
  RGB_FROM_YCBCR = 1 << 13,
  // The texture is used for snapshot.
  SNAPSHOT = 1 << 14,
  // Enable a non blocking read lock.
  NON_BLOCKING_READ_LOCK = 1 << 15,
  // Enable a blocking read lock.
  BLOCKING_READ_LOCK = 1 << 16,
  // Keep TextureClient alive when host side is used
  WAIT_HOST_USAGE_END = 1 << 17,
  // The texture is guaranteed to have alpha 1.0 everywhere; some backends
  // have trouble with RGBX/BGRX formats, so we use RGBA/BGRA but set this
  // hint when we know alpha is opaque (eg. WebGL)
  IS_OPAQUE = 1 << 18,
  // The ExternalImageId bound to the texture is borrowed and should not be
  // explicitly released when the texture is freed. This is meant to be used
  // with WebRenderTextureHost wrapping another TextureHost which was
  // initialized with its own external image ID.
  BORROWED_EXTERNAL_ID = 1 << 19,
  // The texture is used for remote texture.
  REMOTE_TEXTURE = 1 << 20,
  // The texture is from a DRM source.
  DRM_SOURCE = 1 << 21,
  // The texture is dummy texture
  DUMMY_TEXTURE = 1 << 22,
  // Software decoded video
  SOFTWARE_DECODED_VIDEO = 1 << 23,
  // Whether the remote texture must wait for its owner to be created.
  WAIT_FOR_REMOTE_TEXTURE_OWNER = 1 << 24,
  // Buffer is allocated by buffer provider like Canvas2D
  ALLOC_BY_BUFFER_PROVIDER = 1 << 25,

  // OR union of all valid bits
  ALL_BITS = (1 << 26) - 1,
  // the default flags
  DEFAULT = NO_FLAGS
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(TextureFlags)

std::ostream& operator<<(std::ostream& aStream, const TextureFlags& aFlags);

static inline bool TextureRequiresLocking(TextureFlags aFlags) {
  // If we're not double buffered, or uploading
  // within a transaction, then we need to support
  // locking correctly.
  return !(aFlags & TextureFlags::IMMUTABLE);
}

/**
 * The type of debug diagnostic to enable.
 */
enum class DiagnosticTypes : uint8_t {
  NO_DIAGNOSTIC = 0,
  TILE_BORDERS = 1 << 0,
  LAYER_BORDERS = 1 << 1,
  BIGIMAGE_BORDERS = 1 << 2,
  FLASH_BORDERS = 1 << 3,
  ALL_BITS = (1 << 4) - 1
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(DiagnosticTypes)

/**
 * See gfx/layers/Effects.h
 */
enum class EffectTypes : uint8_t {
  ROUNDED_CLIP,
  RGB,
  YCBCR,
  NV12,
  MAX  // sentinel for the count of all effect types
};

/**
 * How the Compositable should manage textures.
 */
enum class CompositableType : uint8_t {
  UNKNOWN,
  IMAGE,  // image with single buffering
  COUNT
};

enum class ImageUsageType : uint8_t {
  UNKNOWN,
  WebRenderImageData,
  WebRenderFallbackData,
  Canvas,
  OffscreenCanvas,
  VideoFrameContainer,
  RemoteVideoDecoder,
  BlackImage,
  Webrtc,
  WebCodecs,
  COUNT
};

/**
 * Sent from the compositor to the content-side LayerManager, includes
 * properties of the compositor and should (in the future) include information
 * about what kinds of buffer and texture clients to create.
 */
struct TextureFactoryIdentifier {
  LayersBackend mParentBackend;
  WebRenderBackend mWebRenderBackend;
  WebRenderCompositor mWebRenderCompositor;
  GeckoProcessType mParentProcessType;
  int32_t mMaxTextureSize;
  bool mCompositorUseANGLE;
  bool mCompositorUseDComp;
  bool mUseLayerCompositor;
  bool mUseCompositorWnd;
  bool mSupportsTextureBlitting;
  bool mSupportsPartialUploads;
  bool mSupportsComponentAlpha;
  bool mSupportsD3D11NV12;
  SyncHandle mSyncHandle;

  explicit TextureFactoryIdentifier(
      LayersBackend aLayersBackend = LayersBackend::LAYERS_NONE,
      GeckoProcessType aParentProcessType = GeckoProcessType_Default,
      int32_t aMaxTextureSize = 4096, bool aCompositorUseANGLE = false,
      bool aCompositorUseDComp = false, bool aUseLayerCompositor = false,
      bool aUseCompositorWnd = false, bool aSupportsTextureBlitting = false,
      bool aSupportsPartialUploads = false, bool aSupportsComponentAlpha = true,
      bool aSupportsD3D11NV12 = false, SyncHandle aSyncHandle = {})
      : mParentBackend(aLayersBackend),
        mWebRenderBackend(WebRenderBackend::HARDWARE),
        mWebRenderCompositor(WebRenderCompositor::DRAW),
        mParentProcessType(aParentProcessType),
        mMaxTextureSize(aMaxTextureSize),
        mCompositorUseANGLE(aCompositorUseANGLE),
        mCompositorUseDComp(aCompositorUseDComp),
        mUseLayerCompositor(aUseLayerCompositor),
        mUseCompositorWnd(aUseCompositorWnd),
        mSupportsTextureBlitting(aSupportsTextureBlitting),
        mSupportsPartialUploads(aSupportsPartialUploads),
        mSupportsComponentAlpha(aSupportsComponentAlpha),
        mSupportsD3D11NV12(aSupportsD3D11NV12),
        mSyncHandle(aSyncHandle) {}

  explicit TextureFactoryIdentifier(
      WebRenderBackend aWebRenderBackend,
      WebRenderCompositor aWebRenderCompositor,
      GeckoProcessType aParentProcessType = GeckoProcessType_Default,
      int32_t aMaxTextureSize = 4096, bool aCompositorUseANGLE = false,
      bool aCompositorUseDComp = false, bool aUseLayerCompositor = false,
      bool aUseCompositorWnd = false, bool aSupportsTextureBlitting = false,
      bool aSupportsPartialUploads = false, bool aSupportsComponentAlpha = true,
      bool aSupportsD3D11NV12 = false, SyncHandle aSyncHandle = {})
      : mParentBackend(LayersBackend::LAYERS_WR),
        mWebRenderBackend(aWebRenderBackend),
        mWebRenderCompositor(aWebRenderCompositor),
        mParentProcessType(aParentProcessType),
        mMaxTextureSize(aMaxTextureSize),
        mCompositorUseANGLE(aCompositorUseANGLE),
        mCompositorUseDComp(aCompositorUseDComp),
        mUseLayerCompositor(aUseLayerCompositor),
        mUseCompositorWnd(aUseCompositorWnd),
        mSupportsTextureBlitting(aSupportsTextureBlitting),
        mSupportsPartialUploads(aSupportsPartialUploads),
        mSupportsComponentAlpha(aSupportsComponentAlpha),
        mSupportsD3D11NV12(aSupportsD3D11NV12),
        mSyncHandle(aSyncHandle) {}
};

/**
 * Information required by the compositor from the content-side for creating or
 * using compositables and textures.
 * XXX - TextureInfo is a bad name: this information is useful for the
 * compositable, not the Texture. And ith new Textures, only the compositable
 * type is really useful. This may (should) be removed in the near future.
 */
struct TextureInfo {
  CompositableType mCompositableType;
  ImageUsageType mUsageType;
  TextureFlags mTextureFlags;

  TextureInfo()
      : mCompositableType(CompositableType::UNKNOWN),
        mUsageType(ImageUsageType::UNKNOWN),
        mTextureFlags(TextureFlags::NO_FLAGS) {}

  TextureInfo(CompositableType aType, ImageUsageType aUsageType,
              TextureFlags aTextureFlags)
      : mCompositableType(aType),
        mUsageType(aUsageType),
        mTextureFlags(aTextureFlags) {}

  bool operator==(const TextureInfo& aOther) const {
    return mCompositableType == aOther.mCompositableType &&
           mTextureFlags == aOther.mTextureFlags;
  }
};

/**
 * How a SurfaceDescriptor will be opened.
 *
 * See ShadowLayerForwarder::OpenDescriptor for example.
 */
enum class OpenMode : uint8_t {
  OPEN_NONE = 0,
  OPEN_READ = 0x1,
  OPEN_WRITE = 0x2,

  OPEN_READ_WRITE = OPEN_READ | OPEN_WRITE,
  OPEN_READ_ONLY = OPEN_READ,
  OPEN_WRITE_ONLY = OPEN_WRITE,
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(OpenMode)

// The kinds of complex clip a shader can support
// We rely on the items in this enum being sequential
enum class ClipType : uint8_t {
  ClipNone = 0,  // no complex clip
  RoundedRect,
  NumClipTypes
};

}  // namespace layers
}  // namespace mozilla

#endif