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Direct2D: Add debug check for axis-aligned clip layers

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This is similar to the check performed by the D2D debug layer that will still work with the debug layer disabled.
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Matt Gonzalez 2024-05-10 20:31:30 -07:00 • committed by reuk
parent 2ca5fdf18d
commit 6ca54e8c97
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1 changed files with 64 additions and 3 deletions
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67
modules/juce_graphics/native/juce_Direct2DGraphicsContext_windows.cpp
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@ -54,9 +54,70 @@ public:
void push (ComSmartPtr<ID2D1DeviceContext1> context, const D2D1_LAYER_PARAMETERS& layerParameters)
{
// Clipping and transparency are all handled by pushing Direct2D layers. The SavedState creates an internal stack
// of Layer objects to keep track of how many layers need to be popped.
// Pass nullptr for the PushLayer layer parameter to allow Direct2D to manage the layers (Windows 8 or later)
// Clipping and transparency are all handled by pushing Direct2D
// layers.The SavedState creates an internal stack of Layer objects to
// keep track of how many layers need to be popped. Pass nullptr for
// the PushLayer layer parameter to allow Direct2D to manage the layers
// (Windows 8 or later)
#if JUCE_DEBUG
// Check if this should be an axis-aligned clip layer (per the D2D
// debug layer)
const auto isGeometryAxisAlignedRectangle = [&]
{
auto* geometry = layerParameters.geometricMask;
if (geometry == nullptr)
return false;
struct Sink : public ComBaseClassHelper<ID2D1SimplifiedGeometrySink>
{
D2D1_POINT_2F lastPoint{};
bool axisAlignedLines = true;
UINT32 lineCount = 0;
STDMETHOD (Close)() override { return S_OK; }
STDMETHOD_ (void, SetFillMode) (D2D1_FILL_MODE) override {}
STDMETHOD_ (void, SetSegmentFlags) (D2D1_PATH_SEGMENT) override {}
STDMETHOD_ (void, EndFigure) (D2D1_FIGURE_END) override {}
STDMETHOD_ (void, BeginFigure) (D2D1_POINT_2F p, D2D1_FIGURE_BEGIN) override { lastPoint = p; }
STDMETHOD_ (void, AddLines) (const D2D1_POINT_2F* points, UINT32 count) override
{
for (UINT32 i = 0; i < count; ++i)
{
auto p = points[i];
axisAlignedLines &= (approximatelyEqual (p.x, lastPoint.x) || approximatelyEqual (p.y, lastPoint.y));
lastPoint = p;
}
lineCount += count;
}
STDMETHOD_ (void, AddBeziers) (const D2D1_BEZIER_SEGMENT*, UINT32) override
{
axisAlignedLines = false;
}
};
Sink sink;
geometry->Simplify (D2D1_GEOMETRY_SIMPLIFICATION_OPTION_CUBICS_AND_LINES,
D2D1::Matrix3x2F::Identity(),
1.0f,
&sink);
// Check for 3 lines; the BeginFigure counts as 1 line
return sink.axisAlignedLines && sink.lineCount == 3;
}();
jassert (layerParameters.opacity != 1.0f
|| layerParameters.opacityBrush
|| ! isGeometryAxisAlignedRectangle);
#endif
context->PushLayer (layerParameters, nullptr);
pushedLayers.emplace_back (popLayerFlag);
}