| 1 |
using System; |
| 2 |
|
| 3 |
namespace Oni.Imaging |
| 4 |
{ |
| 5 |
internal static class TgaReader |
| 6 |
{ |
| 7 |
public static Surface Read(string filePath) |
| 8 |
{ |
| 9 |
using (var reader = new BinaryReader(filePath)) |
| 10 |
{ |
| 11 |
var header = TgaHeader.Read(reader); |
| 12 |
|
| 13 |
Surface surface; |
| 14 |
|
| 15 |
switch (header.ImageType) |
| 16 |
{ |
| 17 |
case TgaImageType.TrueColor: |
| 18 |
surface = LoadTrueColor(header, reader); |
| 19 |
break; |
| 20 |
|
| 21 |
case TgaImageType.RleTrueColor: |
| 22 |
surface = LoadRleTrueColor(header, reader); |
| 23 |
break; |
| 24 |
|
| 25 |
default: |
| 26 |
throw new NotSupportedException(string.Format("Invalid or unsupported TGA image type {0}", header.ImageType)); |
| 27 |
} |
| 28 |
|
| 29 |
if (header.XFlip) |
| 30 |
surface.FlipHorizontal(); |
| 31 |
|
| 32 |
if (!header.YFlip) |
| 33 |
surface.FlipVertical(); |
| 34 |
|
| 35 |
return surface; |
| 36 |
} |
| 37 |
} |
| 38 |
|
| 39 |
private static Surface LoadTrueColor(TgaHeader header, BinaryReader reader) |
| 40 |
{ |
| 41 |
int pixelSize = header.PixelSize; |
| 42 |
var format = header.GetSurfaceFormat(); |
| 43 |
|
| 44 |
var dst = new Surface(header.Width, header.Height, format); |
| 45 |
var src = reader.ReadBytes(header.Width * header.Height * pixelSize); |
| 46 |
int srcOffset = 0; |
| 47 |
|
| 48 |
for (int y = 0; y < header.Height; y++) |
| 49 |
{ |
| 50 |
for (int x = 0; x < header.Width; x++) |
| 51 |
{ |
| 52 |
dst[x, y] = header.GetPixel(src, srcOffset); |
| 53 |
srcOffset += pixelSize; |
| 54 |
} |
| 55 |
} |
| 56 |
|
| 57 |
return dst; |
| 58 |
} |
| 59 |
|
| 60 |
private static Surface LoadRleTrueColor(TgaHeader header, BinaryReader reader) |
| 61 |
{ |
| 62 |
int pixelSize = header.PixelSize; |
| 63 |
var format = header.GetSurfaceFormat(); |
| 64 |
|
| 65 |
var dst = new Surface(header.Width, header.Height, format); |
| 66 |
|
| 67 |
var src = reader.ReadBytes(reader.Length - reader.Position); |
| 68 |
int srcOffset = 0; |
| 69 |
|
| 70 |
int y = 0; |
| 71 |
int x = 0; |
| 72 |
|
| 73 |
var color = Color.Black; |
| 74 |
|
| 75 |
while (y < header.Height) |
| 76 |
{ |
| 77 |
int packetType = src[srcOffset++]; |
| 78 |
|
| 79 |
int packetPixelCount = (packetType & 127) + 1; |
| 80 |
bool isRle = ((packetType & 128) != 0); |
| 81 |
|
| 82 |
for (int i = 0; i < packetPixelCount && y < header.Height; i++) |
| 83 |
{ |
| 84 |
if (i == 0 || !isRle) |
| 85 |
{ |
| 86 |
color = header.GetPixel(src, srcOffset); |
| 87 |
srcOffset += pixelSize; |
| 88 |
} |
| 89 |
|
| 90 |
dst[x, y] = color; |
| 91 |
x++; |
| 92 |
|
| 93 |
if (x == header.Width) |
| 94 |
{ |
| 95 |
x = 0; |
| 96 |
y++; |
| 97 |
} |
| 98 |
} |
| 99 |
} |
| 100 |
|
| 101 |
return dst; |
| 102 |
} |
| 103 |
} |
| 104 |
} |
