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Optimise DrawNoise in launcher by removing function calls in the inner loop (which can be called millions of time when launcher is full screen).

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This commit is contained in:
UnknownShadow200 2016-04-04 12:43:59 +10:00
parent eb081bca76
commit 15d73ab7ac
1 changed files with 15 additions and 10 deletions
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19
Launcher2/Gui/Drawer2DExt.cs
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@ -35,7 +35,7 @@ namespace Launcher {
}
public unsafe static void DrawTiledPixels( FastBitmap src, FastBitmap dst,
Rectangle srcRect, Rectangle dstRect ) {
Rectangle srcRect, Rectangle dstRect ) {
int srcWidth = srcRect.Width, dstWidth = dstRect.Width;
int srcHeight = srcRect.Height, dstHeight = dstRect.Height;
int srcX = srcRect.X, dstX = dstRect.X;
@ -55,14 +55,19 @@ namespace Launcher {
if( !CheckCoords( dst, dstRect, out dstX, out dstY, out dstWidth, out dstHeight ) )
return;
const int alpha = 255 << 24;
for( int yy = 0; yy < dstHeight; yy++ ) {
int* row = dst.GetRowPtr( dstY + yy );
for( int xx = 0; xx < dstWidth; xx++ ) {
float n = Noise( dstX + xx, dstY + yy );
int r = col.R + (int)(n * variation); Utils.Clamp( ref r, 0, 255 );
int g = col.G + (int)(n * variation); Utils.Clamp( ref g, 0, 255 );
int b = col.B + (int)(n * variation); Utils.Clamp( ref b, 0, 255 );
int n = (dstX + xx) + (dstY + yy) * 57;
n = (n << 13) ^ n;
float noise = 1f - ((n * (n * n * 15731 + 789221) + 1376312589) & 0x7fffffff) / 1073741824f;
int r = col.R + (int)(noise * variation);
r = r < 0 ? 0 : (r > 255 ? 255 : r);
int g = col.G + (int)(noise * variation);
g = g < 0 ? 0 : (g > 255 ? 255 : g);
int b = col.B + (int)(noise * variation);
b = b < 0 ? 0 : (b > 255 ? 255 : b);
row[dstX + xx] = alpha | (r << 16) | (g << 8) | b;
}
}
@ -82,7 +87,7 @@ namespace Launcher {
}
static bool CheckCoords( FastBitmap dst, Rectangle dstRect, out int dstX,
out int dstY, out int dstWidth, out int dstHeight ) {
out int dstY, out int dstWidth, out int dstHeight ) {
dstWidth = dstRect.Width; dstHeight = dstRect.Height;
dstX = dstRect.X; dstY = dstRect.Y;
if( dstX >= dst.Width || dstY >= dst.Height ) return false;