1 // Copyright 2019 The SwiftShader Authors. All Rights Reserved.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 //    http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 class BC_Decoder
16 {
17 public:
18 	/// BCn_Decoder::Decode - Decodes 1 to 4 channel images to 8 bit output
19 	/// @param src            Pointer to BCn encoded image
20 	/// @param dst            Pointer to decoded output image
21 	/// @param w              image width
22 	/// @param h              image height
23 	/// @param dstPitch       dst image pitch (bytes per row)
24 	/// @param dstBpp         dst image bytes per pixel
25 	/// @param n              n in BCn format
26 	/// @param isNoAlphaU     BC1: true if RGB, BC2/BC3: unused, BC4/BC5/BC6H: true if unsigned
27 	/// @return               true if the decoding was performed
28 
29 	static bool Decode(const unsigned char *src, unsigned char *dst, int w, int h, int dstPitch, int dstBpp, int n, bool isNoAlphaU);
30 };
31