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UpdateRegion: Fix bug where storage for update regions was never reallocated

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reuk 2025-12-15 17:41:26 +00:00
parent 65206568c4
commit cd6176bd00
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1 changed files with 21 additions and 18 deletions
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39
modules/juce_graphics/native/juce_DirectX_windows.cpp
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@ -364,7 +364,7 @@ void UpdateRegion::findRECTAndValidate (HWND windowHandle)
{
numRect = 0;
auto regionHandle = CreateRectRgn (0, 0, 0, 0);
auto* regionHandle = CreateRectRgn (0, 0, 0, 0);
if (regionHandle == nullptr)
{
@ -372,33 +372,36 @@ void UpdateRegion::findRECTAndValidate (HWND windowHandle)
return;
}
auto regionType = GetUpdateRgn (windowHandle, regionHandle, false);
const ScopeGuard regionDeleter { [&] { DeleteObject (regionHandle); } };
const auto regionType = GetUpdateRgn (windowHandle, regionHandle, false);
if (regionType == SIMPLEREGION || regionType == COMPLEXREGION)
if (regionType == ERROR || regionType == NULLREGION)
return;
const auto requiredBytes = GetRegionData (regionHandle, 0, nullptr);
block.ensureSize (requiredBytes);
const auto regionDataResult = GetRegionData (regionHandle,
(DWORD) block.getSize(),
static_cast<RGNDATA*> (block.getData()));
numRect = std::invoke ([&]() -> decltype (numRect)
{
auto regionDataBytes = GetRegionData (regionHandle, (DWORD) block.getSize(), (RGNDATA*) block.getData());
if (regionDataResult < sizeof (RGNDATAHEADER))
return 0;
if (regionDataBytes > block.getSize())
{
block.ensureSize (regionDataBytes);
regionDataBytes = GetRegionData (regionHandle, (DWORD) block.getSize(), (RGNDATA*) block.getData());
}
const auto* header = static_cast<RGNDATAHEADER const* const> (block.getData());
if (regionDataBytes > 0)
{
auto header = (RGNDATAHEADER const* const) block.getData();
if (header->iType != RDH_RECTANGLES)
return 0;
if (header->iType == RDH_RECTANGLES)
numRect = header->nCount;
}
}
return header->nCount;
});
if (numRect > 0)
ValidateRgn (windowHandle, regionHandle);
else
ValidateRect (windowHandle, nullptr);
DeleteObject (regionHandle);
}
//==============================================================================