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using System; |
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using System.Collections.Generic; |
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using System.IO; |
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|
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namespace Oni.Imaging |
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{ |
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internal static class TgaWriter |
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{ |
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public static void Write(Surface surface, string filePath) |
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{ |
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surface = surface.Convert(SurfaceFormat.BGRA); |
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|
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var imageType = TgaImageType.TrueColor; |
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byte[] rleData = null; |
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|
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if (surface.Width > 2 && surface.Height > 2) |
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{ |
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rleData = Rle32Compress(surface.Width, surface.Height, surface.Data); |
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|
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if (rleData.Length > surface.Data.Length) |
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rleData = null; |
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else |
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imageType = TgaImageType.RleTrueColor; |
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} |
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|
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var header = TgaHeader.Create(surface.Width, surface.Height, imageType); |
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|
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Directory.CreateDirectory(Path.GetDirectoryName(filePath)); |
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|
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using (var stream = File.Create(filePath)) |
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using (var writer = new BinaryWriter(stream)) |
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{ |
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header.Write(writer); |
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|
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if (rleData != null) |
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writer.Write(rleData, 0, rleData.Length); |
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else |
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writer.Write(surface.Data, 0, surface.Data.Length); |
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} |
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} |
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|
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private static byte[] Rle32Compress(int width, int height, byte[] sourceData) |
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{ |
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var result = new List<byte>(); |
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|
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for (int y = height - 1; y >= 0; y--) |
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{ |
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int lineOffset = y * width * 4; |
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int lastPixel = BitConverter.ToInt32(sourceData, y * width * 4); |
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int runStart = 0; |
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byte packetType = 64; |
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|
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for (int x = 1; x < width; x++) |
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{ |
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int pixel = BitConverter.ToInt32(sourceData, x * 4 + lineOffset); |
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|
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if (pixel == lastPixel) |
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{ |
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if (packetType == 0) |
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{ |
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Rle32WritePackets(result, packetType, sourceData, runStart, x - 1, lineOffset); |
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runStart = x - 1; |
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} |
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|
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packetType = 128; |
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} |
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else |
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{ |
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if (packetType == 128) |
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{ |
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Rle32WritePackets(result, packetType, sourceData, runStart, x, lineOffset); |
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runStart = x; |
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} |
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|
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packetType = 0; |
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} |
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|
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lastPixel = pixel; |
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|
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if (x == width - 1) |
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{ |
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Rle32WritePackets(result, packetType, sourceData, runStart, width, lineOffset); |
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} |
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} |
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} |
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|
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return result.ToArray(); |
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} |
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|
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private static void Rle32WritePackets(List<byte> result, byte packetType, byte[] sourceData, int xStart, int xStop, int lineOffset) |
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{ |
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int count = xStop - xStart; |
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|
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if (count == 0) |
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return; |
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|
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int startOffset = (xStart * 4) + lineOffset; |
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|
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if (packetType == 128) |
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{ |
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for (; count > 128; count -= 128) |
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{ |
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result.Add((byte)(packetType | 127)); |
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|
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for (int i = 0; i < 4; i++) |
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result.Add(sourceData[startOffset + i]); |
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} |
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|
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result.Add((byte)(packetType | (count - 1))); |
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|
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for (int i = 0; i < 4; i++) |
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result.Add(sourceData[startOffset + i]); |
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} |
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else |
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{ |
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for (; count > 128; count -= 128) |
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{ |
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result.Add((byte)(packetType | 127)); |
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|
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for (int i = 0; i < 4 * 128; i++) |
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result.Add(sourceData[startOffset + i]); |
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|
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startOffset += 4 * 128; |
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} |
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|
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result.Add((byte)(packetType | (count - 1))); |
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|
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for (int i = 0; i < 4 * count; i++) |
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result.Add(sourceData[startOffset + i]); |
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} |
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} |
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} |
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} |
