using System;

using BCnEncoder.Shared;

namespace BCnEncoder.Decoder

{

internal interface IRawDecoder {

Rgba32[] Decode(byte[] data, int pixelWidth, int pixelHeight);

}

public class RawRDecoder : IRawDecoder {

private readonly bool redAsLuminance;

public RawRDecoder(bool redAsLuminance) {

this.redAsLuminance = redAsLuminance;

}

public Rgba32[] Decode(byte[] data, int pixelWidth, int pixelHeight) {

Rgba32[] output = new Rgba32[pixelWidth * pixelHeight];

for (int i = 0; i < output.Length; i++) {

if (redAsLuminance) {

output[i].R = data[i];

output[i].G = data[i];

output[i].B = data[i];

}

else {

output[i].R = data[i];

output[i].G = 0;

output[i].B = 0;

}

output[i].A = 255;

}

return output;

}

}

public class RawRGDecoder : IRawDecoder

{

public Rgba32[] Decode(byte[] data, int pixelWidth, int pixelHeight) {

Rgba32[] output = new Rgba32[pixelWidth * pixelHeight];

for (int i = 0; i < output.Length; i++) {

output[i].R = data[i * 2];

output[i].G = data[i * 2 + 1];

output[i].B = 0;

output[i].A = 255;

}

return output;

}

}

public class RawRGBDecoder : IRawDecoder

{

public Rgba32[] Decode(byte[] data, int pixelWidth, int pixelHeight) {

Rgba32[] output = new Rgba32[pixelWidth * pixelHeight];

for (int i = 0; i < output.Length; i++) {

output[i].R = data[i * 3];

output[i].G = data[i * 3 + 1];

output[i].B = data[i * 3 + 2];

output[i].A = 255;

}

return output;

}

}

public class RawRGBADecoder : IRawDecoder

{

public Rgba32[] Decode(byte[] data, int pixelWidth, int pixelHeight) {

Rgba32[] output = new Rgba32[pixelWidth * pixelHeight];

for (int i = 0; i < output.Length; i++) {

output[i].R = data[i * 4];

output[i].G = data[i * 4 + 1];

output[i].B = data[i * 4 + 2];

output[i].A = data[i * 4 + 3];

}

return output;

}

}

}