desktop-packages team mailing list archive

[Marcus Comstedt <marcus@xxxxxxxx>]

Public bug reported:

When using gdk_cairo_region_create_from_surface() on a big endian
system, the points in the resulting region get reversed in horizontal
groups of 8.  I've attached an example program that clearly shows the
problem, and I'll attach screenshots from running it on  amd64 (little
endian, works) and ppc (big endian, does not work).

The output from the program when running on ppc is

R 0: 0
R 1: 0
R 2: 0
R 3: 0
R 4: 0
R 5: 0
R 6: 0
R 7: 8
R 8: 8
R 9: 8

but the expected output is

R 0: 1
R 1: 2
R 2: 3
R 3: 4
R 4: 5
R 5: 6
R 6: 7
R 7: 8
R 8: 9
R 9: 10

Since the text output is wrong, my conclusion is that the bug is in
gdk_cairo_region_create_from_surface(), and not in
gtk_widget_shape_combine_region().

** Affects: gtk+3.0 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/916196

Title:
  gdk_cairo_region_create_from_surface() broken on big endian

Status in “gtk+3.0” package in Ubuntu:
  New

Bug description:
  When using gdk_cairo_region_create_from_surface() on a big endian
  system, the points in the resulting region get reversed in horizontal
  groups of 8.  I've attached an example program that clearly shows the
  problem, and I'll attach screenshots from running it on  amd64 (little
  endian, works) and ppc (big endian, does not work).

  The output from the program when running on ppc is

  R 0: 0
  R 1: 0
  R 2: 0
  R 3: 0
  R 4: 0
  R 5: 0
  R 6: 0
  R 7: 8
  R 8: 8
  R 9: 8

  but the expected output is

  R 0: 1
  R 1: 2
  R 2: 3
  R 3: 4
  R 4: 5
  R 5: 6
  R 6: 7
  R 7: 8
  R 8: 9
  R 9: 10

  Since the text output is wrong, my conclusion is that the bug is in
  gdk_cairo_region_create_from_surface(), and not in
  gtk_widget_shape_combine_region().

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