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Jun 24, 2025
Merged

Support wide gamut colors when applying a DlColor to an SkPaint #170613

auto-submit merged 2 commits into from
Jun 24, 2025

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@jason-simmons jason-simmons commented Jun 13, 2025

Fixes #170203

@jason-simmons jason-simmons requested a review from flar June 13, 2025 20:52
@github-actions github-actions bot added the engine flutter/engine related. See also e: labels. label Jun 13, 2025
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Golden file changes have been found for this pull request. Click here to view and triage (e.g. because this is an intentional change).

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flar commented Jun 13, 2025

Skia supports color spaces, we should communicate the intended color space to them rather than just switching to Color4f and hoping that the range issues won't affect them.

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jason-simmons commented Jun 13, 2025

SkPaint::setColor interprets a default/null color space as sRGB (see https://skia.googlesource.com/skia/+/refs/heads/main/include/core/SkPaint.h#243).

The documentation mentions support for extended range (e.g. https://skia.googlesource.com/skia/+/refs/heads/main/include/core/SkPaint.h#227).

Does that cover this use case? Or does this change need to do something more specific?

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flar commented Jun 13, 2025

The version of setColor that takes a Color4f also takes an optional ColorSpace. I don't know if that reference to extended SRGB covers this without manually specifying a CS. The floats can express extended range, but how is that interpreted with no CS?

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flar commented Jun 14, 2025

After reviewing, their docs seems to imply that they will just clamp. I asked the team for clarification, but I'll proceed with the review as if that is the case.

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LGTM with suggestions, but we should fix the ToSkColor conversion.

engine/src/flutter/display_list/skia/dl_sk_conversions.h Outdated

inline SkColor ToSk(DlColor color) {
// Returns an SkColor4f representing this color in the sRGB color space.
inline SkColor4f ToSk(DlColor color) {
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How much is that used. Rather than reuse the name for a new type of conversion, it might be better to have both type-named as ToSkColor4f and ToSkColor.

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done

engine/src/flutter/display_list/skia/dl_sk_conversions_unittests.cc Outdated
TEST(DisplayListSkConversions, ToSkColor) {
// Red
ASSERT_EQ(ToSk(DlColor::kRed()), SK_ColorRED);
ASSERT_EQ(ToSk(DlColor::kRed()), SkColors::kRed);
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Add tests so that we test both 4f and regular.

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done

engine/src/flutter/display_list/skia/dl_sk_conversions.h
}
}

inline SkColor ToSkColor(DlColor color) {
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This will fail in the cases that use it with wide gamut colors because out of range floats corrupt the value as they are not clamped in the argb() conversion. Try rendering with a shadow and a wide color and you should see the old broken behavior as that code still uses the SkColor conversion.

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Also drawAtlas has an array of colors that doesn't use these macros but just calls argb() directly which produces bad data...

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Suggestion:

DlColor::argb() {
  if (!cs == sRGB) {
    return withCS(sRGB).argb();
  }
  // mul, shift
}

Then have withCS() do:

case ExtendedSRGB:
  case sRGB:
    return DlColor(alpha, clamp, clamp, clamp, sRGB);
...
case P3:
  case sRGB:
    return transform(extended)->withCS(sRGB);

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done

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LGTM

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Changes reported for pull request #170613 at sha c875d92

@jason-simmons jason-simmons added the autosubmit Merge PR when tree becomes green via auto submit App label Jun 24, 2025
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flutter/flutter@d733bea...2773c0c

2025-06-25 jason-simmons@users.noreply.github.com Log stack traces from exceptions thrown by devicelab test tasks (flutter/flutter#171165)
2025-06-25 mdebbar@google.com Revert "Move `web_long_running_tests_{1,5}_5` to `bringup`." (flutter/flutter#171100)
2025-06-25 bruno.leroux@gmail.com Add missing M3 tests for InputDecoration.isDense (flutter/flutter#171058)
2025-06-25 34871572+gmackall@users.noreply.github.com Add Android specific sub-step to validate the Android sdk path has no spaces (flutter/flutter#170829)
2025-06-24 737941+loic-sharma@users.noreply.github.com Update foundation library to export internal (flutter/flutter#170563)
2025-06-24 matanlurey@users.noreply.github.com Remove stale references to `Release-process.md` and `conductor` (flutter/flutter#171046)
2025-06-24 30870216+gaaclarke@users.noreply.github.com License cpp jun23 (flutter/flutter#171047)
2025-06-24 magder@google.com Add android-reviewers to CODEOWNERS (flutter/flutter#170157)
2025-06-24 srawlins@google.com Update tool/README.md regarding locally-built engine (flutter/flutter#171102)
2025-06-24 mdebbar@google.com [web] Align the PR triage process with the ecosystem's triage flow (flutter/flutter#171086)
2025-06-24 danny@tuppeny.com [flutter_tool] Migrate DAP off `ProcessUtils.writelnToStdinUnsafe` (flutter/flutter#171081)
2025-06-24 mdebbar@google.com [web] More granular configuration of the test environment (flutter/flutter#168767)
2025-06-24 127918074+salemiranloye@users.noreply.github.com Clean up Devfs_Web into separate files (flutter/flutter#170769)
2025-06-24 59215665+davidhicks980@users.noreply.github.com Add RawMenuAnchor animation callbacks (flutter/flutter#167806)
2025-06-24 jason-simmons@users.noreply.github.com Support wide gamut colors when applying a DlColor to an SkPaint (flutter/flutter#170613)
2025-06-24 nshahan@google.com Remove temporary workaround for web testing (flutter/flutter#170949)
2025-06-24 engine-flutter-autoroll@skia.org Roll Packages from 02770da to d9d3191 (6 revisions) (flutter/flutter#171075)
2025-06-24 15619084+vashworth@users.noreply.github.com Add LLDB warnings (flutter/flutter#170827)
2025-06-24 bruno.leroux@gmail.com Update FormField.initialValue documentation (flutter/flutter#171061)
2025-06-24 engine-flutter-autoroll@skia.org Roll Skia from 132cb2052565 to a462e701b493 (2 revisions) (flutter/flutter#171063)
2025-06-24 engine-flutter-autoroll@skia.org Roll Skia from f88706e3a863 to 132cb2052565 (4 revisions) (flutter/flutter#171057)
2025-06-24 zeqinjie@qq.com When maintainHintSize is false, hint is centered and aligned, it is different from the original one (flutter/flutter#168654)
2025-06-24 bruno.leroux@gmail.com Deprecate DropdownButtonFormField "value" parameter in favor of "initialValue" (flutter/flutter#170805)
2025-06-24 engine-flutter-autoroll@skia.org Roll Skia from af6feb799ea6 to f88706e3a863 (2 revisions) (flutter/flutter#171056)
2025-06-24 engine-flutter-autoroll@skia.org Roll Dart SDK from aebd78999b1a to d9edd9e7a634 (1 revision) (flutter/flutter#171053)
2025-06-24 engine-flutter-autoroll@skia.org Roll Skia from ae517eba0170 to af6feb799ea6 (1 revision) (flutter/flutter#171052)
2025-06-24 engine-flutter-autoroll@skia.org Roll Skia from a7735d517e6a to ae517eba0170 (9 revisions) (flutter/flutter#171049)
2025-06-24 rmacnak@google.com Enable interpretation fallback when unable to JIT on iOS. (flutter/flutter#170835)
2025-06-24 kevmoo@users.noreply.github.com Flutter test cleanup (flutter/flutter#170891)
2025-06-24 matanlurey@users.noreply.github.com Move `packages_autoroller` out of the carcass of `conductor`, delete `conductor` (flutter/flutter#171029)
2025-06-23 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Don't strip symbols from `libapp.so` on android by default (#162464)" (flutter/flutter#171044)
2025-06-23 engine-flutter-autoroll@skia.org Roll Dart SDK from a09de0d3556c to aebd78999b1a (2 revisions) (flutter/flutter#171039)
2025-06-23 34871572+gmackall@users.noreply.github.com Don't strip symbols from `libapp.so` on android by default (flutter/flutter#162464)
2025-06-23 engine-flutter-autoroll@skia.org Roll Skia from 0311837abe86 to a7735d517e6a (12 revisions) (flutter/flutter#171037)
2025-06-23 bungeman@chromium.org Pass font scanner to font mgr that need it (flutter/flutter#170701)
2025-06-23 jacksongardner@google.com Make service worker tests more lenient. (flutter/flutter#170939)
2025-06-23 737941+loic-sharma@users.noreply.github.com Remove update CHANGELOG step from stable cherry pick process (flutter/flutter#171017)
2025-06-23 15619084+vashworth@users.noreply.github.com Include dev_dependencies in all builds for iOS and macOS (flutter/flutter#171015)
2025-06-23 matanlurey@users.noreply.github.com Move `web_long_running_tests_{1,5}_5` to `bringup`. (flutter/flutter#171026)
2025-06-23 muhatashim@google.com rename from announce to supportsAnnounce on engine (flutter/flutter#170618)
2025-06-23 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#171016)
2025-06-23 azat24680@gmail.com Enhance Text Contrast for WCAG AAA Compliance (flutter/flutter#170758)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-packages
...
mboetger pushed a commit to mboetger/flutter that referenced this pull request Jul 21, 2025
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Support wide gamut colors when applying a DlColor to an SkPaint (flut…
956dcd5 
…ter#170613)

Fixes flutter#170203
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@engine-flutter-autoroll @vashworth
Roll Flutter from d733bea to 2773c0c (42 revisions) (flutter#9495)
ae14bed 
Roll Flutter from d733bea to 2773c0c (42 revisions)

flutter/flutter@d733bea...2773c0c

2025-06-25 jason-simmons@users.noreply.github.com Log stack traces from exceptions thrown by devicelab test tasks (flutter/flutter#171165)
2025-06-25 mdebbar@google.com Revert "Move `web_long_running_tests_{1,5}_5` to `bringup`." (flutter/flutter#171100)
2025-06-25 bruno.leroux@gmail.com Add missing M3 tests for InputDecoration.isDense (flutter/flutter#171058)
2025-06-25 34871572+gmackall@users.noreply.github.com Add Android specific sub-step to validate the Android sdk path has no spaces (flutter/flutter#170829)
2025-06-24 737941+loic-sharma@users.noreply.github.com Update foundation library to export internal (flutter/flutter#170563)
2025-06-24 matanlurey@users.noreply.github.com Remove stale references to `Release-process.md` and `conductor` (flutter/flutter#171046)
2025-06-24 30870216+gaaclarke@users.noreply.github.com License cpp jun23 (flutter/flutter#171047)
2025-06-24 magder@google.com Add android-reviewers to CODEOWNERS (flutter/flutter#170157)
2025-06-24 srawlins@google.com Update tool/README.md regarding locally-built engine (flutter/flutter#171102)
2025-06-24 mdebbar@google.com [web] Align the PR triage process with the ecosystem's triage flow (flutter/flutter#171086)
2025-06-24 danny@tuppeny.com [flutter_tool] Migrate DAP off `ProcessUtils.writelnToStdinUnsafe` (flutter/flutter#171081)
2025-06-24 mdebbar@google.com [web] More granular configuration of the test environment (flutter/flutter#168767)
2025-06-24 127918074+salemiranloye@users.noreply.github.com Clean up Devfs_Web into separate files (flutter/flutter#170769)
2025-06-24 59215665+davidhicks980@users.noreply.github.com Add RawMenuAnchor animation callbacks (flutter/flutter#167806)
2025-06-24 jason-simmons@users.noreply.github.com Support wide gamut colors when applying a DlColor to an SkPaint (flutter/flutter#170613)
2025-06-24 nshahan@google.com Remove temporary workaround for web testing (flutter/flutter#170949)
2025-06-24 engine-flutter-autoroll@skia.org Roll Packages from 02770da to d9d3191 (6 revisions) (flutter/flutter#171075)
2025-06-24 15619084+vashworth@users.noreply.github.com Add LLDB warnings (flutter/flutter#170827)
2025-06-24 bruno.leroux@gmail.com Update FormField.initialValue documentation (flutter/flutter#171061)
2025-06-24 engine-flutter-autoroll@skia.org Roll Skia from 132cb2052565 to a462e701b493 (2 revisions) (flutter/flutter#171063)
2025-06-24 engine-flutter-autoroll@skia.org Roll Skia from f88706e3a863 to 132cb2052565 (4 revisions) (flutter/flutter#171057)
2025-06-24 zeqinjie@qq.com When maintainHintSize is false, hint is centered and aligned, it is different from the original one (flutter/flutter#168654)
2025-06-24 bruno.leroux@gmail.com Deprecate DropdownButtonFormField "value" parameter in favor of "initialValue" (flutter/flutter#170805)
2025-06-24 engine-flutter-autoroll@skia.org Roll Skia from af6feb799ea6 to f88706e3a863 (2 revisions) (flutter/flutter#171056)
2025-06-24 engine-flutter-autoroll@skia.org Roll Dart SDK from aebd78999b1a to d9edd9e7a634 (1 revision) (flutter/flutter#171053)
2025-06-24 engine-flutter-autoroll@skia.org Roll Skia from ae517eba0170 to af6feb799ea6 (1 revision) (flutter/flutter#171052)
2025-06-24 engine-flutter-autoroll@skia.org Roll Skia from a7735d517e6a to ae517eba0170 (9 revisions) (flutter/flutter#171049)
2025-06-24 rmacnak@google.com Enable interpretation fallback when unable to JIT on iOS. (flutter/flutter#170835)
2025-06-24 kevmoo@users.noreply.github.com Flutter test cleanup (flutter/flutter#170891)
2025-06-24 matanlurey@users.noreply.github.com Move `packages_autoroller` out of the carcass of `conductor`, delete `conductor` (flutter/flutter#171029)
2025-06-23 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Don't strip symbols from `libapp.so` on android by default (#162464)" (flutter/flutter#171044)
2025-06-23 engine-flutter-autoroll@skia.org Roll Dart SDK from a09de0d3556c to aebd78999b1a (2 revisions) (flutter/flutter#171039)
2025-06-23 34871572+gmackall@users.noreply.github.com Don't strip symbols from `libapp.so` on android by default (flutter/flutter#162464)
2025-06-23 engine-flutter-autoroll@skia.org Roll Skia from 0311837abe86 to a7735d517e6a (12 revisions) (flutter/flutter#171037)
2025-06-23 bungeman@chromium.org Pass font scanner to font mgr that need it (flutter/flutter#170701)
2025-06-23 jacksongardner@google.com Make service worker tests more lenient. (flutter/flutter#170939)
2025-06-23 737941+loic-sharma@users.noreply.github.com Remove update CHANGELOG step from stable cherry pick process (flutter/flutter#171017)
2025-06-23 15619084+vashworth@users.noreply.github.com Include dev_dependencies in all builds for iOS and macOS (flutter/flutter#171015)
2025-06-23 matanlurey@users.noreply.github.com Move `web_long_running_tests_{1,5}_5` to `bringup`. (flutter/flutter#171026)
2025-06-23 muhatashim@google.com rename from announce to supportsAnnounce on engine (flutter/flutter#170618)
2025-06-23 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#171016)
2025-06-23 azat24680@gmail.com Enhance Text Contrast for WCAG AAA Compliance (flutter/flutter#170758)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-packages
...
engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Aug 14, 2025
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12e4a89 Support wide gamut colors when applying a DlColor to an SkPai…
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engine-flutter-autoroll added a commit to engine-flutter-autoroll/packages that referenced this pull request Aug 14, 2025
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12e4a89 Support wide gamut colors when applying a DlColor to an SkPai…
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12e4a89 Support wide gamut colors when applying a DlColor to an SkPai…
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[Impeller] Colors with ColorSpace.displayP3 are displayed incorrectly on Mac in release mode.

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