This benchmark renders one of the radial gradients used in the
swfdec-youtube cairo trace 500 times and reports the average time it
took.
V2: Update .gitignore
This program displays a linear gradient from blue to yellow. Due to
limited precision in pixman-gradient-walker.c, it currently has some
ugly artefacts that gives it a 'brushed metal' appearance.
V2: Update .gitignore
Since pixman-combine64.[ch] are not used anymore, there is no point
generating these files from pixman-combine.[ch].template.
Also get rid of dependency on perl in configure.ac.
The 64 bit pipeline is not used anymore, so it can now be removed.
Don't generate pixman-combine64.[ch] anymore. Don't generate the
pixman-srgb.c anymore. Delete all the 64 bit fetchers in
pixman-access.c, all the 64 bit iterator functions in
pixman-bits-image.c and all the functions that expand from 8 to 16
bits.
Simple sRGB color blender test can be used to determine if the sRGB processing
works as expected. It blends alpha ramps of purple and green together such that
at midpoint of image, 50 % blend of both is realized. At that point, sRGB-aware
processing yields a result close to #bbb rather than #888, which is the linear
light blending result.
The demo also contains the sample computation for sRGB premultiplied alpha.
sRGB format is defined as a new format type, PIXMAN_TYPE_ARGB_SRGB. One form of
this type is provided, PIXMAN_a8r8g8b8_sRGB. Use of an sRGB format triggers
wide processing, and the pixel fetch/store functions handle the relevant
conversion between color spaces. Pixman itself is thought to compose in the
linearized sRGB color space.
sRGB conversion is tabularized. For sRGB to linear, we are using only 256
values because the current source format uses 8 bits per component precision.
For linear to sRGB, it turns out that only 4096 brightness levels are required
to generate all of the 256 sRGB color values, and therefore only 12 bits per
component are considered during store. As a special case, a no-op
sRGB->linear->sRGB conversion is constructed to be lossless by adjusting the
sRGB->linear conversion table where necessary.
The complete new API here makes available compile-tim version checks:
PIXMAN_VERSION
PIXMAN_VERSION_STRING
PIXMAN_VERSION_ENCODE
as well as run-time version checks:
pixman_version()
pixman_version_string()
