public static ReducedClip create(ClipStack stack, uiRect layerBounds, uiRect queryBounds)
{
ReducedClip clip = ObjectPool <ReducedClip> .alloc();
uiRect?stackBounds;
bool iior;
stack.getBounds(out stackBounds, out iior);
if (stackBounds == null)
{
clip.scissor = layerBounds;
return(clip);
}
stackBounds = uiRectHelper.intersect(layerBounds, stackBounds.Value);
if (iior)
{
clip.scissor = stackBounds;
return(clip);
}
queryBounds = uiRectHelper.intersect(stackBounds.Value, queryBounds);
if (queryBounds.isEmpty)
{
clip.scissor = uiRectHelper.zero;
return(clip);
}
clip.scissor = queryBounds;
clip._walkStack(stack, clip.scissor.Value);
return(clip);
}
bool _applyClip(uiRect?queryBounds)
{
if (queryBounds == null || queryBounds.Value.isEmpty)
{
return(false);
}
var layer = this._currentLayer;
var layerBounds = layer.layerBounds;
ReducedClip reducedClip = ReducedClip.create(layer.clipStack, layerBounds, queryBounds.Value);
if (reducedClip.isEmpty())
{
ObjectPool <ReducedClip> .release(reducedClip);
return(false);
}
var scissor = reducedClip.scissor;
var physicalRect = uiRectHelper.fromLTRB(0, 0, layer.width, layer.height);
if (uiRectHelper.equals(scissor, layerBounds))
{
this._tryAddScissor(layer, null);
}
else
{
var deviceScissor = uiRectHelper.fromLTRB(
scissor.Value.left - layerBounds.left, layerBounds.bottom - scissor.Value.bottom,
scissor.Value.right - layerBounds.left, layerBounds.bottom - scissor.Value.top
);
deviceScissor = uiRectHelper.scale(deviceScissor, layer.width / layerBounds.width,
layer.height / layerBounds.height);
deviceScissor = uiRectHelper.roundOut(deviceScissor);
deviceScissor = uiRectHelper.intersect(deviceScissor, physicalRect);
if (deviceScissor.isEmpty)
{
ObjectPool <ReducedClip> .release(reducedClip);
return(false);
}
this._tryAddScissor(layer, deviceScissor);
}
var maskGenID = reducedClip.maskGenID();
if (this._mustRenderClip(maskGenID, reducedClip.scissor.Value))
{
if (maskGenID == ClipStack.wideOpenGenID)
{
layer.ignoreClip = true;
}
else
{
layer.ignoreClip = false;
// need to inflate a bit to make sure all area is cleared.
var inflatedScissor = uiRectHelper.inflate(reducedClip.scissor.Value, this._fringeWidth);
var boundsMesh = uiMeshMesh.create(inflatedScissor);
layer.draws.Add(CanvasShader.stencilClear(layer, boundsMesh));
foreach (var maskElement in reducedClip.maskElements)
{
layer.draws.Add(CanvasShader.stencil0(layer, maskElement.mesh.duplicate()));
layer.draws.Add(CanvasShader.stencil1(layer, boundsMesh.duplicate()));
}
}
this._setLastClipGenId(maskGenID, reducedClip.scissor.Value);
}
ObjectPool <ReducedClip> .release(reducedClip);
return(true);
}
bool _applyClip(Rect queryBounds)
{
var layer = this._currentLayer;
var layerBounds = layer.layerBounds;
ReducedClip reducedClip = new ReducedClip(layer.clipStack, layerBounds, queryBounds);
if (reducedClip.isEmpty())
{
return(false);
}
var scissor = reducedClip.scissor;
var physicalRect = Rect.fromLTRB(0, 0, layer.width, layer.height);
if (scissor == layerBounds)
{
this._tryAddScissor(layer, null);
}
else
{
var deviceScissor = Rect.fromLTRB(
scissor.left - layerBounds.left, layerBounds.bottom - scissor.bottom,
scissor.right - layerBounds.left, layerBounds.bottom - scissor.top
).scale(layer.width / layerBounds.width, layer.height / layerBounds.height);
deviceScissor = deviceScissor.roundOut();
deviceScissor = deviceScissor.intersect(physicalRect);
if (deviceScissor.isEmpty)
{
return(false);
}
this._tryAddScissor(layer, deviceScissor);
}
var maskGenID = reducedClip.maskGenID();
if (this._mustRenderClip(maskGenID, reducedClip.scissor))
{
if (maskGenID == ClipStack.wideOpenGenID)
{
layer.ignoreClip = true;
}
else
{
layer.ignoreClip = false;
var boundsMesh = new MeshMesh(reducedClip.scissor);
layer.draws.Add(CanvasShader.stencilClear(layer, boundsMesh));
foreach (var maskElement in reducedClip.maskElements)
{
layer.draws.Add(CanvasShader.stencil0(layer, maskElement.mesh));
layer.draws.Add(CanvasShader.stencil1(layer, boundsMesh));
}
}
this._setLastClipGenId(maskGenID, reducedClip.scissor);
}
return(true);
}