| Flutter Impeller |

Public Member Functions | Static Public Member Functions | Public Attributes | List of all members
impeller::android::HardwareBufferDescriptor Struct Reference

A descriptor use to specify hardware buffer allocations. More...

`#include <hardware_buffer.h>`

## Public Member Functions
bool | IsAllocatable () const
| If hardware buffers can be created using this descriptor. Allocatable descriptors may still cause failing allocations in case of resource exhaustion. More...
constexpr bool | operator== (const HardwareBufferDescriptor &o) const =default

## Static Public Member Functions
static HardwareBufferDescriptor | MakeForSwapchainImage (const ISize &size)
| Create a descriptor of the given size that is suitable for use as a swapchain image. More...

## Public Attributes
HardwareBufferFormat | format = HardwareBufferFormat::kR8G8B8A8UNormInt
ISize | size
HardwareBufferUsage | usage = HardwareBufferUsageFlags::kNone

## Detailed Description

A descriptor use to specify hardware buffer allocations.

Definition at line 47 of file hardware_buffer.h.

## Member Function Documentation

## ◆ IsAllocatable()

bool impeller::android::HardwareBufferDescriptor::IsAllocatable | ( |  | ) | const

If hardware buffers can be created using this descriptor. Allocatable descriptors may still cause failing allocations in case of resource exhaustion.

Returns
  `true` if allocatable (unless resource exhaustion).

Definition at line 52 of file hardware_buffer.cc.

52 {
53 const auto desc = ToAHardwareBufferDesc(*this);
54 return GetProcTable().AHardwareBuffer_isSupported(&desc) != 0u;
55 }
impeller::android::GetProcTable
const ProcTable & GetProcTable()
Definition: proc_table.cc:12
impeller::android::ToAHardwareBufferDesc
static AHardwareBuffer_Desc ToAHardwareBufferDesc(const HardwareBufferDescriptor &desc)
Definition: hardware_buffer.cc:20

References impeller::android::GetProcTable(), and impeller::android::ToAHardwareBufferDesc().

Referenced by impeller::AHBTexturePoolVK::AHBTexturePoolVK(), and impeller::android::HardwareBuffer::HardwareBuffer().

## ◆ MakeForSwapchainImage()

HardwareBufferDescriptor impeller::android::HardwareBufferDescriptor::MakeForSwapchainImage | ( | const ISize & | size | ) |
| static

Create a descriptor of the given size that is suitable for use as a swapchain image.

Warning
  Descriptors of zero size are not allocatable. The next best valid size is picked. So make sure to check the actual size of the descriptor after this call is made to determine the size of the allocated hardware buffer.

Parameters

  [in] | size | The size. See the restrictions about valid sizes above.

Returns
  The hardware buffer descriptor.

Definition at line 87 of file hardware_buffer.cc.

88 {
89 HardwareBufferDescriptor desc;
90 desc.format = HardwareBufferFormat::kR8G8B8A8UNormInt;
91 // Zero sized hardware buffers cannot be allocated.
92 desc.size = size.Max(ISize{1u, 1u});
93 desc.usage = HardwareBufferUsageFlags::kFrameBufferAttachment |
94 HardwareBufferUsageFlags::kCompositorOverlay |
95 HardwareBufferUsageFlags::kSampledImage;
96 return desc;
97 }
impeller::android::HardwareBufferFormat::kR8G8B8A8UNormInt
@ kR8G8B8A8UNormInt
impeller::android::HardwareBufferUsageFlags::kCompositorOverlay
@ kCompositorOverlay
impeller::android::HardwareBufferUsageFlags::kFrameBufferAttachment
@ kFrameBufferAttachment
impeller::android::HardwareBufferUsageFlags::kSampledImage
@ kSampledImage
impeller::ISize
ISize64 ISize
Definition: size.h:162
impeller::TSize::Max
constexpr TSize Max(const TSize &o) const
Definition: size.h:97
impeller::android::HardwareBufferDescriptor::size
ISize size
Definition: hardware_buffer.h:49

References format, impeller::android::kCompositorOverlay, impeller::android::kFrameBufferAttachment, impeller::android::kR8G8B8A8UNormInt, impeller::android::kSampledImage, impeller::TSize< T >::Max(), size, and usage.

Referenced by impeller::android::testing::TEST().

## ◆ operator==()

constexpr bool impeller::android::HardwareBufferDescriptor::operator== | ( | const HardwareBufferDescriptor & | o | ) | const
| constexprdefault

## Member Data Documentation

## ◆ format

HardwareBufferFormat impeller::android::HardwareBufferDescriptor::format = HardwareBufferFormat::kR8G8B8A8UNormInt

Definition at line 48 of file hardware_buffer.h.

Referenced by MakeForSwapchainImage(), impeller::android::testing::TEST(), impeller::android::ToAHardwareBufferDesc(), and impeller::ToSwapchainTextureDescriptor().

## ◆ size

ISize impeller::android::HardwareBufferDescriptor::size

Definition at line 49 of file hardware_buffer.h.

Referenced by impeller::AHBSwapchainImplVK::GetSize(), MakeForSwapchainImage(), impeller::android::testing::TEST(), impeller::android::ToAHardwareBufferDesc(), and impeller::ToSwapchainTextureDescriptor().

## ◆ usage

HardwareBufferUsage impeller::android::HardwareBufferDescriptor::usage = HardwareBufferUsageFlags::kNone

Definition at line 50 of file hardware_buffer.h.

Referenced by MakeForSwapchainImage(), impeller::android::testing::TEST(), and impeller::android::ToAHardwareBufferDesc().

The documentation for this struct was generated from the following files:

- impeller/toolkit/android/hardware_buffer.h
- impeller/toolkit/android/hardware_buffer.cc