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Direct2DGraphicsContextTests: Ignore the image edges to allow for differences in anti-aliasing

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attila 2025-07-16 19:13:10 +02:00 • committed by Attila Szarvas
parent 3f898f6fee
commit 19906c9d2f
1 changed files with 28 additions and 4 deletions
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32
modules/juce_graphics/native/juce_Direct2DGraphicsContext_windows.cpp
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@ -1327,13 +1327,34 @@ public:
g.drawImageTransformed (imageToDraw, transform);
}
compareImages (targetNative, targetSoftware);
auto pixelsToIgnore = createEdgeMask (imageToDraw.getWidth(),
imageToDraw.getHeight(),
targetNative.getWidth(),
targetNative.getHeight(),
transform);
compareImages (targetNative, targetSoftware, 16, pixelsToIgnore);
}
}
}
}
void compareImages (const Image& a, const Image& b)
static Image createEdgeMask (int sourceWidth,
int sourceHeight,
int maskWidth,
int maskHeight,
const AffineTransform& transform)
{
Image mask { Image::SingleChannel, maskWidth, maskHeight, true, SoftwareImageType{} };
Graphics g { mask };
g.addTransform (transform);
g.setColour (Colours::white);
g.drawRect (Rectangle<int> { 0, 0, sourceWidth + 1, sourceHeight + 1 }.toFloat(), 2.0f);
return mask;
}
void compareImages (const Image& a, const Image& b, int stride, const Image& ignoreMask)
{
expect (a.getBounds() == b.getBounds());
@ -1344,10 +1365,13 @@ public:
int64_t accumulatedError{};
int64_t numSamples{};
for (auto y = 0; y < a.getHeight(); y += 16)
for (auto y = 0; y < a.getHeight(); y += stride)
{
for (auto x = 0; x < a.getWidth(); x += 16)
for (auto x = 0; x < a.getWidth(); x += stride)
{
if (ignoreMask.getPixelAt (x, y) != Colour{})
continue;
const auto expected = bitmapA.getPixelColour (x, y);
const auto actual = bitmapB.getPixelColour (x, y);