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[vector_graphics_compiler] Fix em units in text positions - #13388
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Text `x`, `y`, `dx` and `dy` values in `em` were parsed with the unit stripped, so `dy=".35em"` moved the text by 0.35 pixels. They are now multiplied by the element's font size, falling back to the same default of 16 used when drawing the text. Fixes flutter/flutter#158758
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rohanjariwala03
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October 22, 2026 18:39
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This pull request introduces support for 'em' units in SVG text positions (x, y, dx, dy) by updating the DoubleOrPercentage class to parse and calculate values relative to the font size. Feedback suggests converting the parsed string to lowercase to ensure case-insensitive matching of the 'em' unit.
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gaaclarke
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October 26, 2026 18:22
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# Conflicts: # packages/vector_graphics_compiler/CHANGELOG.md
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@gaaclarke Thanks for the review! Merged upstream. Since 1.3.3 is now the coordinate list change, I moved this entry to 1.3.4. |
gaaclarke
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Oct 28, 2026
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@flar can you be a second review on this please? |
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Mostly LGTM, but there's a nit that I'd like to hear back about...
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@gaaclarke @flar I've merged the main branch and updated the PR. Can you merge this? |
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flutter/packages@0b72e92...3742a4e 2026-10-30 [email protected] [pigeon] Allow event channel unregistration (flutter/packages#13438) 2026-10-30 [email protected] [material_ui] Fix Escape key not closing MenuAnchor opened by tap or click (flutter/packages#13430) 2026-10-30 [email protected] manual roll and manual build and copy (flutter/packages#13495) 2026-10-29 [email protected] [pigeon] Separate native interop Dart bindings into a conditionally imported companion file (flutter/packages#13393) 2026-10-29 [email protected] [image_picker_ios] PR 4/5 Migrate the view provider, PHPicker save operation, and image utilities to Swift (flutter/packages#13394) 2026-10-29 [email protected] Sync release-material_ui-1.9.0 to main (flutter/packages#13479) 2026-10-29 [email protected] [material_ui] Unskip web tests that pass on CanvasKit and Skwasm: time_picker_test (flutter/packages#13471) 2026-10-29 [email protected] [vector_graphics] Dispose pictures decoded after their VectorGraphic is removed (flutter/packages#13435) 2026-10-29 [email protected] [camera_android_x] implement CameraX RecordingStats and VideoRecordEvent APIs (flutter/packages#13330) 2026-10-29 [email protected] Sync release-go_router-18.1.2 to main (flutter/packages#13480) 2026-10-29 [email protected] Sync release-cupertino_ui-1.1.5 to main (flutter/packages#13481) 2026-10-29 [email protected] [vector_graphics_compiler] Fix em units in text positions (flutter/packages#13388) 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-flutter-autoroll Please CC [email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Flutter: 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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flutter/packages@0b72e92...3742a4e 2026-10-30 [email protected] [pigeon] Allow event channel unregistration (flutter/packages#13438) 2026-10-30 [email protected] [material_ui] Fix Escape key not closing MenuAnchor opened by tap or click (flutter/packages#13430) 2026-10-30 [email protected] manual roll and manual build and copy (flutter/packages#13495) 2026-10-29 [email protected] [pigeon] Separate native interop Dart bindings into a conditionally imported companion file (flutter/packages#13393) 2026-10-29 [email protected] [image_picker_ios] PR 4/5 Migrate the view provider, PHPicker save operation, and image utilities to Swift (flutter/packages#13394) 2026-10-29 [email protected] Sync release-material_ui-1.9.0 to main (flutter/packages#13479) 2026-10-29 [email protected] [material_ui] Unskip web tests that pass on CanvasKit and Skwasm: time_picker_test (flutter/packages#13471) 2026-10-29 [email protected] [vector_graphics] Dispose pictures decoded after their VectorGraphic is removed (flutter/packages#13435) 2026-10-29 [email protected] [camera_android_x] implement CameraX RecordingStats and VideoRecordEvent APIs (flutter/packages#13330) 2026-10-29 [email protected] Sync release-go_router-18.1.2 to main (flutter/packages#13480) 2026-10-29 [email protected] Sync release-cupertino_ui-1.1.5 to main (flutter/packages#13481) 2026-10-29 [email protected] [vector_graphics_compiler] Fix em units in text positions (flutter/packages#13388) 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-flutter-autoroll Please CC [email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Flutter: 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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Text
x,y,dxanddyvalues inemwere treated as pixels. For example,dy=".35em"withfont-size="425px"moved the text down by 0.35 pixels instead of about 149, so text centered this way was drawn too high.DoubleOrPercentage.fromStringstripped the unit withparseDouble, so anemvalue ended up the same as a plain number. Now it remembers that the value is inem, andcomputeTextPositionmultiplies it by the element's font size, including one inherited from a parent. Without a font size it useskDefaultFontSize(16), the same defaultcomputeTextConfiguses when drawing the text. The bug is invector_graphics_compiler, whichflutter_svguses to parse SVGs.Fixes flutter/flutter#158758
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