gecko-dev/gfx/layers/ImageDataSerializer.h

96 lines
2.5 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=8 et :
*/
/* 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 GFX_LAYERS_BLOBSURFACE_H
#define GFX_LAYERS_BLOBSURFACE_H
#include <stdint.h> // for uint8_t, uint32_t
#include "mozilla/Attributes.h" // for MOZ_STACK_CLASS
#include "mozilla/RefPtr.h" // for TemporaryRef
#include "mozilla/gfx/Point.h" // for IntSize
#include "mozilla/gfx/Types.h" // for SurfaceFormat
namespace mozilla {
namespace gfx {
class DataSourceSurface;
class DrawTarget;
} // namespace gfx
} // namespace mozilla
namespace mozilla {
namespace layers {
class ImageDataSerializerBase
{
public:
bool IsValid() const { return mIsValid; }
uint8_t* GetData();
uint32_t GetStride() const;
gfx::IntSize GetSize() const;
gfx::SurfaceFormat GetFormat() const;
TemporaryRef<gfx::DataSourceSurface> GetAsSurface();
TemporaryRef<gfx::DrawTarget> GetAsDrawTarget(gfx::BackendType aBackend);
static uint32_t ComputeMinBufferSize(gfx::IntSize aSize,
gfx::SurfaceFormat aFormat);
protected:
ImageDataSerializerBase(uint8_t* aData, size_t aDataSize)
: mData(aData)
, mDataSize(aDataSize)
, mIsValid(false)
{}
void Validate();
uint8_t* mData;
size_t mDataSize;
bool mIsValid;
};
/**
* A facility to serialize an image into a buffer of memory.
* This is intended for use with the IPC code, in order to copy image data
* into shared memory.
* Note that there is a separate serializer class for YCbCr images
* (see YCbCrImageDataSerializer.h).
*/
class MOZ_STACK_CLASS ImageDataSerializer : public ImageDataSerializerBase
{
public:
ImageDataSerializer(uint8_t* aData, size_t aDataSize)
: ImageDataSerializerBase(aData, aDataSize)
{
// a serializer needs to be usable before correct buffer info has been written to it
mIsValid = !!mData;
}
void InitializeBufferInfo(gfx::IntSize aSize,
gfx::SurfaceFormat aFormat);
};
/**
* A facility to deserialize image data that has been serialized by an
* ImageDataSerializer.
*/
class MOZ_STACK_CLASS ImageDataDeserializer : public ImageDataSerializerBase
{
public:
ImageDataDeserializer(uint8_t* aData, size_t aDataSize)
: ImageDataSerializerBase(aData, aDataSize)
{
Validate();
}
};
} // namespace layers
} // namespace mozilla
#endif