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  29. Sep 02, 2016
    • Bill Spitzak's avatar
      pixman-image: Added enable-gnuplot config to view filters in gnuplot · d0e6c9f4
      Bill Spitzak authored and Søren Sandmann's avatar Søren Sandmann committed 
      
If enable-gnuplot is configured, then you can pipe the output of a
pixman-using program to gnuplot and get a continuously-updated plot of
the horizontal filter. This works well with demos/scale to test the
filter generation.

The plot is all the different subposition filters shuffled
together. This is misleading in a few cases:

  IMPULSE.BOX - goes up and down as the subfilters have different
                numbers of non-zero samples

  IMPULSE.TRIANGLE - somewhat crooked for the same reason

  1-wide filters - looks triangular, but a 1-wide box would be more
                   accurate

Changes by Søren: Rewrote the pixman-filter.c part to
     - make it generate correct coordinates
     - add a comment on how coordinates are generated
     - in rounding.txt, add a ceil() variant of the first-sample
       formula
     - make the gnuplot output slightly prettier

v7: First time this ability was included

v8: Use config option
    Moved code to the filter generator
    Modified scale demo to not call filter generator a second time.

v10: Only print if successful generation of plots
     Use #ifdef, not #if

v11: small whitespace fixes
v12: output range from -width/2 to width/2 and include y==0, to avoid misleading plots
     for subsample_bits==0 and for box filters which may have no small values.

Signed-off-by: default avatarBill Spitzak <spitzak@gmail.com>
      d0e6c9f4
  31. Dec 23, 2015
  33. Dec 22, 2015
  35. Nov 18, 2015
  37. Oct 23, 2015
  39. Oct 13, 2015
  41. Sep 20, 2015
  43. Aug 01, 2015
  45. Apr 02, 2014
    • Siarhei Siamashka's avatar
      configure.ac: Check if the compiler supports GCC vector extensions · 840912b3
      Siarhei Siamashka authored 
      The Intel Compiler 14.0.0 claims version GCC 4.7.3 compatibility
via __GNUC__/__GNUC__MINOR__ macros, but does not provide the same
level of GCC vector extensions support as the original GCC compiler:
    http://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html

Which results in the following compilation failure:

In file included from ../test/utils.h(7),
                 from ../test/utils.c(3):
../test/utils-prng.h(138): error: expression must have integral type
      uint32x4 e = x->a - ((x->b << 27) + (x->b >> (32 - 27)));
                            ^

The problem is fixed by doing a special check in configure for
this feature.
      840912b3
  47. Dec 26, 2013
    • Søren Sandmann's avatar
      configure.ac: Check and use -Wno-unused-local-typedefs GCC option · b29d74ef
      Søren Sandmann authored 
      With GCC 4.8.2 the COMPILE_TIME_ASSERT macro produces a spurious
warning about an unused local typedef:

    In file included from pixman.c:29:0:
    pixman.c: In function 'optimize_operator':
    pixman-private.h:1019:22: warning: typedef 'compile_time_assertion' locally defined but not used [-Wunused-local-typedefs]

The flag -Wno-unused-local-typedefs suppresses that warning.
      b29d74ef
  49. Nov 10, 2013
  51. Nov 02, 2013