This patch modifies the gradient walker to be able to generate floating
point values directly in addition to a8r8g8b8 32 bit values. This is
then used by the various gradient implementations to render in floating
point when asked to do so, instead of rendering to a8r8g8b8 and then
expanding to flo
This patch implements dithering in pixman. A "dither" property is added
to BITS images, which is used to:
- Force rendering to the image to go through the floating point
pipeline. Note that this is different from FAST_PATH_NARROW_FORMAT
as it should not enable the floating point pipeline
From: Basile Clement
This adds support for testing dithered destinations in tolerance-test.
When dithering is enabled, the pixel checker allows for an additional
quantization error.
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test/tolerance-test.c | 22 +++-
test/utils.c | 122 ++
From: Basile Clement
This adds a dither.c which provides a demo of the dithering feature.
This is based on the scale.c demo for scaling and provides a selection
of intermediate formats and dithering operators (currently, only
PIXMAN_DITHER_BAYER_8) to use. Images are first blitted onto a surface
This is essentially a duplicate of the recent patch by Maarten Lankhorst
(which spurred me into finally posting these, which laid on my laptop
for a couple months), with a slightly different approach. It is mostly
included as it is a prerequisite for the subsequent patches, but they
should wor
Quoting Maarten Lankhorst (2018-12-03 14:00:31)
> The high precision gradient path was falling back to the 8-bit path,
> then expanding it to float. This removed any advantage of the high
> precision path, so make sure our gradients are computed as floats
> by adding a separate path.
>
> Signed-of
The high precision gradient path was falling back to the 8-bit path,
then expanding it to float. This removed any advantage of the high
precision path, so make sure our gradients are computed as floats
by adding a separate path.
Signed-off-by: Maarten Lankhorst
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pixman/pixman-conical-gradient
