whiteoutlib 0.1.4

Read and write Blizzard game assets from Rust: models (MDX, M2, M3), textures (BLP, DDS, PNG, JPEG, BMP, TGA, TIFF, GIF) and archives (CASC, MPQ).
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41

// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) 2026 Fernando Sahmkow

/// @file bc3.h
/// @brief BC3 (DXT5) encode and decode.
///
/// BC3 stores a BC4-style interpolated alpha block (8 bytes) followed by
/// a BC1 colour block (8 bytes), giving 16 bytes per 4x4 block.
///
/// No external dependencies -- pure C++20.

#pragma once

#include "bcn_common.h"

namespace whiteout::textures {
namespace bc3 {

// ---- Decode ----------------------------------------------------------------

/// Decode a BC3 Texture into a new Texture with RGBA8 pixel format.
///
/// @param src       Source texture (must be BC3).
/// @param out_error Optional string to receive an error message on failure.
/// @return The decoded texture, or std::nullopt on error.
std::optional<Texture> decodeTexture(const Texture& src, std::string* out_error = nullptr,
                                     interfaces::WorkerPool* pool = nullptr);

// ---- Encode ----------------------------------------------------------------

/// Compress an RGBA8 Texture into a new Texture with BC3 pixel format.
///
/// @param src       Source texture (must be RGBA8).
/// @param out_error Optional string to receive an error message on failure.
/// @param pool  Optional WorkerPool for parallel tile processing.
/// @return The compressed texture, or std::nullopt on error.
std::optional<Texture> encodeTexture(const Texture& src, std::string* out_error = nullptr,
                                     interfaces::WorkerPool* pool = nullptr);

} // namespace bc3
} // namespace whiteout::textures