xref: /aosp_15_r20/external/swiftshader/src/Device/BC_Decoder.hpp (revision 03ce13f70fcc45d86ee91b7ee4cab1936a95046e)

// Copyright 2019 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

class BC_Decoder
{
public:
	/// BCn_Decoder::Decode - Decodes 1 to 4 channel images to 8 bit output
	/// @param src            Pointer to BCn encoded image
	/// @param dst            Pointer to decoded output image
	/// @param w              image width
	/// @param h              image height
	/// @param dstPitch       dst image pitch (bytes per row)
	/// @param dstBpp         dst image bytes per pixel
	/// @param n              n in BCn format
	/// @param isNoAlphaU     BC1: true if RGB, BC2/BC3: unused, BC4/BC5/BC6H: true if unsigned
	/// @return               true if the decoding was performed

	static bool Decode(const unsigned char *src, unsigned char *dst, int w, int h, int dstPitch, int dstBpp, int n, bool isNoAlphaU);
};