Incorrect fragment shading when drawing shapes with short edge
Reported by
guardian...@gmail.com,
May 31 2017
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Issue descriptionUserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36 Steps to reproduce the problem: 1. Create a webpage with the code provided (shortedge.txt) 2. Notice the shape rendered in screenshot, the fill is incorrect towards the bottom right 3. Remove the bogus line and refresh 4. The shape renders correctly What is the expected behavior? A blue "emblem" shape should be drawn on the canvas What went wrong? The fill of the shape is "washing out" towards to bottom right corner Did this work before? No Does this work in other browsers? Yes Chrome version: 58.0.3029.110 Channel: stable OS Version: OS X 10.12.4 Flash Version: Shockwave Flash 25.0 r0 The same problem does not happen if Hardware acceleration is turned off.
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May 31 2017
Note to self: the problem is in edge inversion handling. Disabling fix_inversions() ameliorates the problem, but introduces artifacts in the thinconcavepaths GM.
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Nov 28 2017
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Jan 2 2018
The following revision refers to this bug: https://chromium.googlesource.com/chromium/src.git/+/e4d6d0b50ec2e40aabe6a8c9928f512101771bb1 commit e4d6d0b50ec2e40aabe6a8c9928f512101771bb1 Author: Stephen White <senorblanco@chromium.org> Date: Tue Jan 02 17:16:48 2018 Enable new edge inversion handling in Skia. Remove the GR_TESSELLATOR_LEGACY_INVERSION_HANDLING #ifdef. This enables the partial straight skeleton (phase 2) in Skia. BUG= 756823 , 754612 , 754293 , 723980 , 728070 Change-Id: I70b4daef016dc950002cb0e98073bc90696b2ab9 Reviewed-on: https://chromium-review.googlesource.com/843082 Reviewed-by: Brian Salomon <bsalomon@chromium.org> Commit-Queue: Stephen White <senorblanco@chromium.org> Cr-Commit-Position: refs/heads/master@{#526496} [modify] https://crrev.com/e4d6d0b50ec2e40aabe6a8c9928f512101771bb1/skia/config/SkUserConfig.h [add] https://crrev.com/e4d6d0b50ec2e40aabe6a8c9928f512101771bb1/third_party/WebKit/LayoutTests/platform/mac/virtual/gpu/fast/canvas/canvas-arc-circumference-fill-expected.png [add] https://crrev.com/e4d6d0b50ec2e40aabe6a8c9928f512101771bb1/third_party/WebKit/LayoutTests/platform/mac/virtual/gpu/fast/canvas/canvas-ellipse-circumference-fill-expected.png [modify] https://crrev.com/e4d6d0b50ec2e40aabe6a8c9928f512101771bb1/third_party/WebKit/LayoutTests/platform/win/virtual/gpu/fast/canvas/canvas-arc-circumference-fill-expected.png [modify] https://crrev.com/e4d6d0b50ec2e40aabe6a8c9928f512101771bb1/third_party/WebKit/LayoutTests/platform/win/virtual/gpu/fast/canvas/canvas-ellipse-circumference-fill-expected.png [delete] https://crrev.com/5b2de20541d2b08bf64e81804b538eb4d03a4e21/third_party/WebKit/LayoutTests/virtual/gpu/fast/canvas/canvas-arc-circumference-fill-expected.png [delete] https://crrev.com/5b2de20541d2b08bf64e81804b538eb4d03a4e21/third_party/WebKit/LayoutTests/virtual/gpu/fast/canvas/canvas-ellipse-circumference-fill-expected.png
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Jan 6 2018
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Comment 1 by senorblanco@chromium.org
, May 31 2017Status: Assigned (was: Unconfirmed)
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