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Fix ScrollRect to DECCRA translation (#17849) 

By translating the clip rectangle into a source-relative coordinate
space we can calculate the intersection that must be copied
much much more easily. I should've done that from the start.

Closes #17801

## Validation Steps Performed
* Test code provided in #17801
This commit is contained in:
Leonard Hecker 2024-09-05 01:06:36 +02:00 committed by GitHub
parent 5fdfd51209
commit d2c3cfd164
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GPG Key ID: B5690EEEBB952194
1 changed files with 20 additions and 18 deletions
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38
src/host/getset.cpp
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@ -995,7 +995,9 @@ void ApiRoutines::GetLargestConsoleWindowSizeImpl(const SCREEN_INFORMATION& cont
try
{
// Just in case if the client application didn't check if this request is useless.
if (source.left == target.x && source.top == target.y)
// Checking if the source is empty also prevents bugs where we use the size of calculations.
if ((source.left == target.x && source.top == target.y) ||
source.left > source.right || source.top > source.bottom)
{
return S_OK;
}
@ -1044,23 +1046,23 @@ void ApiRoutines::GetLargestConsoleWindowSizeImpl(const SCREEN_INFORMATION& cont
if (gci.GetVtIo()->GetDeviceAttributes().test(Microsoft::Console::VirtualTerminal::DeviceAttribute::RectangularAreaOperations))
{
// This calculates just the positive offsets caused by out-of-bounds (OOB) source and target coordinates.
//
// If the source rectangle is OOB to the bottom-right, then the size of the rectangle that can
// be copied shrinks, but its origin stays the same. However, if the rectangle is OOB to the
// top-left then the origin of the to-be-copied rectangle will be offset by an inverse amount.
// Similarly, if the *target* rectangle is OOB to the bottom-right, its size shrinks while
// the origin stays the same, and if it's OOB to the top-left, then the origin is offset.
//
// In other words, this calculates the total offset that needs to be applied to the to-be-copied rectangle.
// Later down below we'll then clamp that rectangle which will cause its size to shrink as needed.
const til::point offset{
std::max(0, -source.left) + std::max(0, clipViewport.Left() - target.x),
std::max(0, -source.top) + std::max(0, clipViewport.Top() - target.y),
};
const til::point targetSourceDistance{ target - sourceViewport.Origin() };
const til::point sourceTargetDistance{ -targetSourceDistance.x, -targetSourceDistance.y };
const auto copyTargetViewport = Viewport::FromDimensions(target + offset, sourceViewport.Dimensions()).Clamp(clipViewport);
const auto copySourceViewport = Viewport::FromDimensions(sourceViewport.Origin() + offset, copyTargetViewport.Dimensions()).Clamp(bufferSize);
// To figure out what part of "source" we can copy to "target" without
// * reading outside the bufferSize
// * writing outside the clipViewport
// we move the clipViewport into a coordinate system relative to the source rectangle (= clipAtSource).
// Then we can intersect the source rectangle with both the valid bufferSize and clipAtSource at once.
const auto clipAtSource = Viewport::Offset(clipViewport, sourceTargetDistance);
auto copySourceViewport = sourceViewport.Clamp(bufferSize).Clamp(clipAtSource);
if (!copySourceViewport.IsValid())
{
copySourceViewport = Viewport::Empty();
}
// Afterward we can undo the translation of clipAtSource to get the target rectangle.
const auto copyTargetViewport = Viewport::Offset(copySourceViewport, targetSourceDistance);
const auto fills = Viewport::Subtract(fillViewport, copyTargetViewport);
std::wstring buf;
@ -1069,7 +1071,7 @@ void ApiRoutines::GetLargestConsoleWindowSizeImpl(const SCREEN_INFORMATION& cont
Microsoft::Console::VirtualTerminal::VtIo::FormatAttributes(buf, TextAttribute{ fillAttribute });
}
if (copySourceViewport.IsValid() && copyTargetViewport.IsValid())
if (copyTargetViewport.IsValid())
{
// DECCRA: Copy Rectangular Area
fmt::format_to(