# VkImageCompressionFlagBitsEXT(3) Manual Page

## Name

VkImageCompressionFlagBitsEXT - Bitmask specifying image compression controls

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## C Specification

Possible values of VkImageCompressionControlEXT::`flags`, specifying compression controls for an image, are:

    // Provided by VK_EXT_image_compression_control
    typedef enum VkImageCompressionFlagBitsEXT {
        VK_IMAGE_COMPRESSION_DEFAULT_EXT = 0,
        VK_IMAGE_COMPRESSION_FIXED_RATE_DEFAULT_EXT = 0x00000001,
        VK_IMAGE_COMPRESSION_FIXED_RATE_EXPLICIT_EXT = 0x00000002,
        VK_IMAGE_COMPRESSION_DISABLED_EXT = 0x00000004,
    } VkImageCompressionFlagBitsEXT;

## Description

- `VK_IMAGE_COMPRESSION_DEFAULT_EXT` specifies that the default image compression setting is used. Implementations must not apply fixed-rate compression.

- `VK_IMAGE_COMPRESSION_FIXED_RATE_DEFAULT_EXT` specifies that the implementation may choose any supported fixed-rate compression setting in an implementation-defined manner based on the properties of the image.

- `VK_IMAGE_COMPRESSION_FIXED_RATE_EXPLICIT_EXT` specifies that fixed-rate compression may be used and that the allowed compression rates are specified by VkImageCompressionControlEXT::`pFixedRateFlags`.

- `VK_IMAGE_COMPRESSION_DISABLED_EXT` specifies that all lossless and fixed-rate compression should be disabled.

If VkImageCompressionControlEXT::`flags` is `VK_IMAGE_COMPRESSION_FIXED_RATE_EXPLICIT_EXT`, then the `i`th member of the `pFixedRateFlags` array specifies the allowed compression rates for the image’s `i`th plane.

Note | If `VK_IMAGE_COMPRESSION_DISABLED_EXT` is included in VkImageCompressionControlEXT::`flags`, both lossless and fixed-rate compression will be disabled. This is likely to have a negative impact on performance and is only intended to be used for debugging purposes.

## See Also

VK_EXT_image_compression_control, VkImageCompressionFlagsEXT

## Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

## Copyright

Copyright 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0