1 // Copyright 2016 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 ETC_Decoder
16 {
17 public:
18 	enum InputType
19 	{
20 		ETC_R_SIGNED,
21 		ETC_R_UNSIGNED,
22 		ETC_RG_SIGNED,
23 		ETC_RG_UNSIGNED,
24 		ETC_RGB,
25 		ETC_RGB_PUNCHTHROUGH_ALPHA,
26 		ETC_RGBA
27 	};
28 
29 	/// ETC_Decoder::Decode - Decodes 1 to 4 channel images to 8 bit output
30 	/// @param src            Pointer to ETC2 encoded image
31 	/// @param dst            Pointer to BGRA, 8 bit output
32 	/// @param w              src image width
33 	/// @param h              src image height
34 	/// @param dstW           dst image width
35 	/// @param dstH           dst image height
36 	/// @param dstPitch       dst image pitch (bytes per row)
37 	/// @param dstBpp         dst image bytes per pixel
38 	/// @param inputType      src's format
39 	/// @return               true if the decoding was performed
40 	static bool Decode(const unsigned char* src, unsigned char *dst, int w, int h, int dstW, int dstH, int dstPitch, int dstBpp, InputType inputType);
41 };
42