[cc] Support 2D scales in raster transforms

Before this patch, AxisTransform2d used to store the transform scale as
a single float, and then all the logic was 1D. This produced suboptimal
results for things like 'transform: scale3d(1, 5, 1)'.

This patch changes AxisTransform2d to store the scale as a Vector2dF,
and updates PictureLayerImpl to use 2D logic. Most of the tiling logic
is kept unchanged, using the maximum component of the scale.

Note that the ideal scale continues clamping the maximum scale component
to not be greater than 5 times the minimum one.

Bug: 1119996

TEST=third_party/blink/web_tests/compositing/transform-3d-scales-different-x-y.html

Change-Id: I13fb3605455393d4a65c788103ba28b923e1cb4a
Cq-Do-Not-Cancel-Tryjobs: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2642377
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Victor Miura <vmiura@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Cr-Commit-Position: refs/heads/master@{#872117}
48 files changed
tree: 58aa71d68a0b81dc0284e721463d5b0474c309a5
  1. .clang-format
  2. .clang-tidy
  3. .eslintrc.js
  4. .git-blame-ignore-revs
  5. .gitattributes
  6. .gitignore
  7. .gn
  8. .vpython
  9. .vpython3
  10. .yapfignore
  11. AUTHORS
  12. BUILD.gn
  13. CODE_OF_CONDUCT.md
  14. DEPS
  15. DIR_METADATA
  16. ENG_REVIEW_OWNERS
  17. LICENSE
  18. LICENSE.chromium_os
  19. OWNERS
  20. PRESUBMIT.py
  21. PRESUBMIT_test.py
  22. PRESUBMIT_test_mocks.py
  23. README.md
  24. WATCHLISTS
  25. android_webview/
  26. apps/
  27. ash/
  28. base/
  29. build/
  30. build_overrides/
  31. buildtools/
  32. cc/
  33. chrome/
  34. chromecast/
  35. chromeos/
  36. cloud_print/
  37. codelabs/
  38. codereview.settings
  39. components/
  40. content/
  41. courgette/
  42. crypto/
  43. dbus/
  44. device/
  45. docs/
  46. extensions/
  47. fuchsia/
  48. gin/
  49. google_apis/
  50. google_update/
  51. gpu/
  52. headless/
  53. infra/
  54. ios/
  55. ipc/
  56. jingle/
  57. media/
  58. mojo/
  59. native_client_sdk/
  60. net/
  61. pdf/
  62. ppapi/
  63. printing/
  64. remoting/
  65. rlz/
  66. sandbox/
  67. services/
  68. skia/
  69. sql/
  70. storage/
  71. styleguide/
  72. testing/
  73. third_party/
  74. tools/
  75. ui/
  76. url/
  77. weblayer/
README.md

Logo Chromium

Chromium is an open-source browser project that aims to build a safer, faster, and more stable way for all users to experience the web.

The project's web site is https://www.chromium.org.

To check out the source code locally, don't use git clone! Instead, follow the instructions on how to get the code.

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For historical reasons, there are some small top level directories. Now the guidance is that new top level directories are for product (e.g. Chrome, Android WebView, Ash). Even if these products have multiple executables, the code should be in subdirectories of the product.