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Support 24 bit png loading.

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This commit is contained in:
Paul Chote
2019-03-04 18:55:11 +00:00
committed by abcdefg30
parent ea2e452075
commit ab6ae7bc8d
1 changed files with 24 additions and 6 deletions
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30
OpenRA.Game/FileFormats/Png.cs
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@@ -38,6 +38,7 @@ namespace OpenRA.FileFormats
s.Position += 8;
var headerParsed = false;
var isPaletted = false;
var is24Bit = false;
var data = new List<byte>();
for (;;)
@@ -64,6 +65,7 @@ namespace OpenRA.FileFormats
var bitDepth = ms.ReadUInt8();
var colorType = (PngColorType)ms.ReadByte();
isPaletted = IsPaletted(bitDepth, colorType);
is24Bit = colorType == PngColorType.Color;
var dataLength = Width * Height;
if (!isPaletted)
@@ -130,21 +132,33 @@ namespace OpenRA.FileFormats
{
using (var ds = new InflaterInputStream(ns))
{
var pxStride = isPaletted ? 1 : 4;
var stride = Width * pxStride;
var pxStride = isPaletted ? 1 : is24Bit ? 3 : 4;
var srcStride = Width * pxStride;
var destStride = Width * (isPaletted ? 1 : 4);
var prevLine = new byte[stride];
var prevLine = new byte[srcStride];
for (var y = 0; y < Height; y++)
{
var filter = (PngFilter)ds.ReadByte();
var line = ds.ReadBytes(stride);
var line = ds.ReadBytes(srcStride);
for (var i = 0; i < stride; i++)
for (var i = 0; i < srcStride; i++)
line[i] = i < pxStride
? UnapplyFilter(filter, line[i], 0, prevLine[i], 0)
: UnapplyFilter(filter, line[i], line[i - pxStride], prevLine[i], prevLine[i - pxStride]);
Array.Copy(line, 0, Data, y * stride, line.Length);
if (is24Bit)
{
// Fold alpha channel into RGB data
for (var i = 0; i < line.Length / 3; i++)
{
Array.Copy(line, 3 * i, Data, y * destStride + 4 * i, 3);
Data[y * destStride + 4 * i + 3] = 255;
}
}
else
Array.Copy(line, 0, Data, y * destStride, line.Length);
prevLine = line;
}
}
@@ -169,6 +183,7 @@ namespace OpenRA.FileFormats
if (data.Length != expectLength)
throw new InvalidDataException("Input data does not match expected length");
Width = width;
Height = height;
@@ -225,6 +240,9 @@ namespace OpenRA.FileFormats
if (bitDepth == 8 && colorType == (PngColorType.Color | PngColorType.Alpha))
return false;
if (bitDepth == 8 && colorType == PngColorType.Color)
return false;
throw new InvalidDataException("Unknown pixel format");
}