[Webkit-unassigned] [Bug 102374] New: [EFL, Cairo?, Freetype?] Subpixel Layout results are vertically off-by-minus-one

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=102374

           Summary: [EFL, Cairo?, Freetype?] Subpixel Layout results are
                    vertically off-by-minus-one
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit EFL
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: dominik.rottsches at intel.com
                CC: demarchi at webkit.org, eae at chromium.org,
                    leviw at chromium.org
            Blocks: 89458


When enabling subpixel layout on EFL, many fast/css/* tests have enclosed elements positioned 1 pixel too high.

Example:

--- /fast/dominik/dev/WebKitGit_EFL/lt_sub/fast/css/background-image-with-baseurl-expected.txt
+++ /fast/dominik/dev/WebKitGit_EFL/lt_sub/fast/css/background-image-with-baseurl-actual.txt
@@ -3,5 +3,5 @@
 layer at (0,0) size 800x600
   RenderBlock {HTML} at (0,0) size 800x600
     RenderBody {BODY} at (8,8) size 784x584
-      RenderText {#text} at (0,0) size 196x19
-        text run at (0,0) width 196: "red squares background image."
+      RenderText {#text} at (0,-1) size 196x19
+        text run at (0,-1) width 196: "red squares background image."

Mac & Chromium subpixel-enabled expectations have:

layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x600
  RenderBlock {HTML} at (0,0) size 800x600
    RenderBody {BODY} at (8,8) size 784x584
      RenderText {#text} at (0,0) size 196x18
        text run at (0,0) width 196: "red squares background image."

Levi, Emil, any suggestions what kind of platform-specific metrics input to the line layout calculations could lead to such an offset?

-- 
Configure bugmail: https://bugs.webkit.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.