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Add BytesPerBlock helper #516

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merged 1 commit into from
Sep 20, 2024
Merged

Add BytesPerBlock helper #516

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2 changes: 2 additions & 0 deletions DirectXTex/DirectXTex.h
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Original file line number Diff line number Diff line change
Expand Up @@ -72,6 +72,8 @@ namespace DirectX

size_t __cdecl BitsPerColor(_In_ DXGI_FORMAT fmt) noexcept;

size_t __cdecl BytesPerBlock(_In_ DXGI_FORMAT fmt) noexcept;

enum FORMAT_TYPE
{
FORMAT_TYPE_TYPELESS,
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39 changes: 39 additions & 0 deletions DirectXTex/DirectXTexUtil.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -920,6 +920,45 @@ size_t DirectX::BitsPerColor(DXGI_FORMAT fmt) noexcept
}


//-------------------------------------------------------------------------------------
// Returns bytes per block for a given DXGI BC format, or 0 on failure
//-------------------------------------------------------------------------------------
_Use_decl_annotations_
size_t DirectX::BytesPerBlock(DXGI_FORMAT fmt) noexcept
{
switch (fmt)
{
case DXGI_FORMAT_BC1_TYPELESS:
case DXGI_FORMAT_BC1_UNORM:
case DXGI_FORMAT_BC1_UNORM_SRGB:
case DXGI_FORMAT_BC4_TYPELESS:
case DXGI_FORMAT_BC4_UNORM:
case DXGI_FORMAT_BC4_SNORM:
return 8;

case DXGI_FORMAT_BC2_TYPELESS:
case DXGI_FORMAT_BC2_UNORM:
case DXGI_FORMAT_BC2_UNORM_SRGB:
case DXGI_FORMAT_BC3_TYPELESS:
case DXGI_FORMAT_BC3_UNORM:
case DXGI_FORMAT_BC3_UNORM_SRGB:
case DXGI_FORMAT_BC5_TYPELESS:
case DXGI_FORMAT_BC5_UNORM:
case DXGI_FORMAT_BC5_SNORM:
case DXGI_FORMAT_BC6H_TYPELESS:
case DXGI_FORMAT_BC6H_UF16:
case DXGI_FORMAT_BC6H_SF16:
case DXGI_FORMAT_BC7_TYPELESS:
case DXGI_FORMAT_BC7_UNORM:
case DXGI_FORMAT_BC7_UNORM_SRGB:
return 16;

default:
return 0;
}
}


//-------------------------------------------------------------------------------------
// Computes the image row pitch in bytes, and the slice ptich (size in bytes of the image)
// based on DXGI format, width, and height
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