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Fixed missing alpha blending and optimized performance.

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git-svn-id: http://svn.code.sf.net/p/greenshot/code/trunk@1718 7dccd23d-a4a3-4e1f-8c07-b4c1b4018ab4
This commit is contained in:
RKrom 2012-03-21 13:12:19 +00:00
parent 4a5e04ae23
commit 64bc855652
2 changed files with 34 additions and 40 deletions
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38
GreenshotPlugin/Core/QuantizerHelper.cs
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@ -71,8 +71,6 @@ namespace GreenshotPlugin.Core {
public class WuQuantizer {
private static log4net.ILog LOG = log4net.LogManager.GetLogger(typeof(WuQuantizer));
private static readonly Color BackgroundColor;
private static readonly Double[] Factors;
private const Int32 MAXCOLOR = 512;
private const Int32 RED = 2;
@ -102,14 +100,6 @@ namespace GreenshotPlugin.Core {
private Bitmap sourceBitmap;
private Bitmap resultBitmap;
static WuQuantizer() {
BackgroundColor = Color.White;
Factors = new Double[256];
for (Int32 value = 0; value < 256; value++) {
Factors[value] = value / 255.0;
}
}
/// <summary>
/// See <see cref="IColorQuantizer.Prepare"/> for more details.
/// </summary>
@ -157,8 +147,7 @@ namespace GreenshotPlugin.Core {
bbbDest.Lock();
for (int y = 0; y < bbbSrc.Height; y++) {
for (int x = 0; x < bbbSrc.Width; x++) {
Color color = bbbSrc.GetColorAt(x, y);
color = ConvertAlpha(color);
Color color = bbbSrc.GetColorAtWithoutAlpha(x, y);
// To count the colors
int index = color.ToArgb() & 0x00ffffff;
// Check if we already have this color
@ -270,8 +259,7 @@ namespace GreenshotPlugin.Core {
byte bestMatch;
for (int y = 0; y < bbbSrc.Height; y++) {
for (int x = 0; x < bbbSrc.Width; x++) {
Color color = bbbSrc.GetColorAt(x, y);
Color color = bbbSrc.GetColorAtWithoutAlpha(x, y);
// Check if we already matched the color
if (!lookup.ContainsKey(color)) {
// If not we need to find the best match
@ -329,28 +317,6 @@ namespace GreenshotPlugin.Core {
return resultBitmap;
}
/// <summary>
/// Converts the alpha blended color to a non-alpha blended color.
/// </summary>
/// <param name="color">The alpha blended color (ARGB).</param>
/// <returns>The non-alpha blended color (RGB).</returns>
private static Color ConvertAlpha(Color color) {
Color result = color;
if (color.A < 255) {
// performs a alpha blending (second color is BackgroundColor, by default a Control color)
Double colorFactor = Factors[color.A];
Double backgroundFactor = Factors[255 - color.A];
Int32 red = (Int32)(color.R * colorFactor + BackgroundColor.R * backgroundFactor);
Int32 green = (Int32)(color.G * colorFactor + BackgroundColor.G * backgroundFactor);
Int32 blue = (Int32)(color.B * colorFactor + BackgroundColor.B * backgroundFactor);
Int32 argb = 255 << 24 | red << 16 | green << 8 | blue;
result = Color.FromArgb(argb);
}
return result;
}
/// <summary>
/// Converts the histogram to a series of moments.
/// </summary>