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Use a trylock to simplify ColorMixerWidget. Fixes #3374.

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This commit is contained in:
Paul Chote
2013-06-28 22:58:36 +12:00
parent d7a580584d
commit 3e2f7b41d8
1 changed files with 31 additions and 30 deletions
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61
OpenRA.Mods.RA/Widgets/ColorMixerWidget.cs
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@@ -26,11 +26,11 @@ namespace OpenRA.Mods.RA.Widgets
public event Action OnChange = () => {};
float H, S, V;
Bitmap frontBitmap, swapBitmap, backBitmap;
Bitmap frontBitmap, backBitmap;
Sprite mixerSprite;
bool isMoving;
bool updateFront, updateBack;
bool update;
object syncWorker = new object();
Thread workerThread;
bool workerAlive;
@@ -51,7 +51,6 @@ namespace OpenRA.Mods.RA.Widgets
// Bitmap data is generated in a background thread and then flipped
frontBitmap = new Bitmap(256, 256);
swapBitmap = new Bitmap(256, 256);
backBitmap = new Bitmap(256, 256);
var rect = new Rectangle((int)(255*SRange[0]), (int)(255*(1 - VRange[1])), (int)(255*(SRange[1] - SRange[0]))+1, (int)(255*(VRange[1] - VRange[0])) + 1);
@@ -65,7 +64,7 @@ namespace OpenRA.Mods.RA.Widgets
// so we do it in a background thread
lock (syncWorker)
{
updateBack = true;
update = true;
if (workerThread == null || !workerAlive)
{
@@ -85,53 +84,55 @@ namespace OpenRA.Mods.RA.Widgets
float hue;
lock (syncWorker)
{
if (!updateBack)
if (!update)
{
workerAlive = false;
break;
}
updateBack = false;
update = false;
// Take a local copy of the hue to generate to avoid tearing
hue = H;
}
var bitmapData = backBitmap.LockBits(backBitmap.Bounds(),
ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
unsafe
lock (backBitmap)
{
int* c = (int*)bitmapData.Scan0;
var bitmapData = backBitmap.LockBits(backBitmap.Bounds(),
ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
// Generate palette in HSV
for (var v = 0; v < 256; v++)
for (var s = 0; s < 256; s++)
*(c + (v * bitmapData.Stride >> 2) + s) = HSLColor.FromHSV(hue, s / 255f, (255 - v) / 255f).RGB.ToArgb();
}
unsafe
{
int* c = (int*)bitmapData.Scan0;
backBitmap.UnlockBits(bitmapData);
lock (syncWorker)
{
var swap = swapBitmap;
swapBitmap = backBitmap;
backBitmap = swap;
updateFront = true;
// Generate palette in HSV
for (var v = 0; v < 256; v++)
for (var s = 0; s < 256; s++)
*(c + (v * bitmapData.Stride >> 2) + s) = HSLColor.FromHSV(hue, s / 255f, (255 - v) / 255f).RGB.ToArgb();
}
backBitmap.UnlockBits(bitmapData);
lock (frontBitmap)
{
var swap = frontBitmap;
frontBitmap = backBitmap;
backBitmap = swap;
}
}
}
}
public override void Draw()
{
lock (syncWorker)
if (Monitor.TryEnter(frontBitmap))
{
if (updateFront)
try
{
var swap = swapBitmap;
swapBitmap = frontBitmap;
frontBitmap = swap;
mixerSprite.sheet.Texture.SetData(frontBitmap);
updateFront = false;
}
finally
{
Monitor.Exit(frontBitmap);
}
}