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[Linux] Fix layer position when compositing without glBlitFramebuffer - #196083
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Regression from 8f5e9b0. Fixes flutter#195885
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It looks like this pull request may not have tests. Please make sure to add tests or get an explicit test exemption before merging. If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix? Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing. If both you and the PR author believe this PR qualifies for a test exemption, escalate to the tech lead for the changed area to review and apply the |
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This pull request updates the OpenGL compositor on Linux to calculate scale factors as doubles and adjusts the shader offset and scale calculations. Feedback suggests adding a defensive guard to prevent potential division by zero when the viewport width or height is zero or negative.
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Since this is a rendering issue it is not easy to add a test. I did have a test that checked the uniforms passed to the shader but this seems too indirect and required on specific knowledge of the shader in use. |
| layer->size.height, layer->offset.x, | ||
| layer->offset.y, layer->size.width, | ||
| layer->size.height, GL_COLOR_BUFFER_BIT, | ||
| GL_NEAREST); |
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Hey, when reviewing this change Opus bubbled up that:
- Instead of passing just
layer->size, we should be adding thelayer->offsettoo. - Flutter's origin is at the top-left with y growing downwards, but OpenGL's origin is at the bottom-left, with y growing upward. We shouldn't pass the
layer->offset.ydirectly to OpenGL.
Today, this works because the offset is always (0, 0). I'd consider fixing this in a follow-up PR.
(Windows isn't affected. It asserts that the offset is 0,0 and hardcodes 0s everywhere).
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Reason for test exemption: This should be covered by a golden integration tests, but we do not have hardware that uses this path. |
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flutter/flutter@09175cd...e36b370 2026-11-07 [email protected] Roll Fuchsia Linux SDK from KIc0XZbhLmvDpTluZ... to Sf2yvdTiFXAKkfLkD... (flutter/flutter#196160) 2026-11-07 [email protected] Roll pub packages (flutter/flutter#196155) 2026-11-07 [email protected] [iOS a11y] Use a real `UIScrollView` as a11y scrollable container (flutter/flutter#195731) 2026-11-07 [email protected] Add ParagraphStyle.hyphenCharacter to dart:ui (flutter/flutter#195345) 2026-11-07 [email protected] Roll pub packages (flutter/flutter#196143) 2026-11-06 [email protected] [Linux] Fix layer position when compositing without glBlitFramebuffer (flutter/flutter#196083) 2026-11-06 [email protected] Add support for riscv64 desktop linux engine (flutter/flutter#178712) 2026-11-06 [email protected] Add ResizeImagePolicy.cover (flutter/flutter#194665) 2026-11-06 [email protected] Roll Skia from f533d4034900 to b11315d0a096 (6 revisions) (flutter/flutter#196138) 2026-11-06 [email protected] iOS: Remove dead code/unused imports from FlutterPlatformViewsController (flutter/flutter#196084) 2026-11-06 [email protected] Replace pull_request_target workflows with pull_request + workflow_run (flutter/flutter#195536) 2026-11-06 [email protected] [master] Update Flutter DEPS to Dart 3b174b7217fe09b21da836ea623932b5f041b091 (flutter/flutter#196004) 2026-11-06 [email protected] Fix android_hardware_smoke_test retry mechanisms (flutter/flutter#195708) 2026-11-06 [email protected] Roll Skia from 452b9c1e5db6 to f533d4034900 (1 revision) (flutter/flutter#196129) 2026-11-06 [email protected] [flutter_tools] Use `ErrorHandlingFileSystem.deleteIfExists` for `IOSCoreDeviceControl` temp directory cleanup (flutter/flutter#195913) 2026-11-06 [email protected] Adds guideline tests to flutter create samples (flutter/flutter#195827) 2026-11-06 [email protected] refactor(flutter_tools): unify OptionDescriptor identity and addTo (flutter/flutter#196076) 2026-11-06 [email protected] Roll pub packages (flutter/flutter#196114) 2026-11-06 [email protected] Roll Skia from 5ce64e63a0e7 to 452b9c1e5db6 (5 revisions) (flutter/flutter#196111) 2026-11-06 [email protected] Add PlatformDispatcher.onAlwaysUse24HourFormatChanged callback (flutter/flutter#194670) 2026-11-06 [email protected] Roll Packages from 0478162 to 63881f9 (10 revisions) (flutter/flutter#196108) 2026-11-06 [email protected] Roll Skia from 793b8ac73d4b to 5ce64e63a0e7 (4 revisions) (flutter/flutter#196107) If this roll has caused a breakage, revert this CL and set the roller to dry run mode using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC [email protected],[email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
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Regression from 8f5e9b0.
Fixes #195885