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Add caching to DeviceN and Separation colors spaces when rendering images

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This commit is contained in:
BobLd
2023-05-21 20:47:22 +01:00
parent c3dd69388d
commit d244c10a94
1 changed files with 20 additions and 5 deletions
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25
src/UglyToad.PdfPig/Graphics/Colors/ColorSpaceDetails.cs
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@@ -533,23 +533,31 @@
/// <inheritdoc/>
internal override IReadOnlyList<byte> Transform(IReadOnlyList<byte> decoded)
{
var cache = new Dictionary<int, double[]>();
var transformed = new List<byte>();
for (var i = 0; i < decoded.Count; i += NumberOfColorComponents)
{
int key = 0;
double[] comps = new double[NumberOfColorComponents];
for (int n = 0; n < NumberOfColorComponents; n++)
{
comps[n] = decoded[i + n] / 255.0;
byte b = decoded[i + n];
key = (key * 31) ^ b;
comps[n] = b / 255.0;
}
if (!cache.TryGetValue(key, out double[] colors))
{
colors = Process(comps);
cache[key] = colors;
}
var colors = Process(comps);
for (int c = 0; c < colors.Length; c++)
{
transformed.Add(ConvertToByte(colors[c]));
}
}
return transformed;
return transformed.ToArray();
}
/// <inheritdoc/>
@@ -697,10 +705,17 @@
/// <inheritdoc/>
internal override IReadOnlyList<byte> Transform(IReadOnlyList<byte> values)
{
var cache = new Dictionary<int, double[]>();
var transformed = new List<byte>();
for (var i = 0; i < values.Count; i += 3)
{
var colors = Process(values[i++] / 255.0);
byte b = values[i++];
if (!cache.TryGetValue(b, out double[] colors))
{
colors = Process(b / 255.0);
cache[b] = colors;
}
for (int c = 0; c < colors.Length; c++)
{
transformed.Add(ConvertToByte(colors[c]));