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https://gitlab.freedesktop.org/wayland/weston
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a0584e64cf
compare_float() was an ad hoc max error logger with optional debug logging. Now that we have rgb_diff_stat, we can get the same statistics and more with less code. It looks like we would lose the pixel index x, but that can be recovered from the dump file line number. This patch takes care to keep the test condition exactly the same as it was before. The statistics print-out has more details now. The recorded dump position is the foreground color as that varies while the background color is constant. An example Octave function is included to show how to visualize the rgb_diff_stat dump. Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
78 lines
1.9 KiB
Matlab
78 lines
1.9 KiB
Matlab
% -- weston_plot_rgb_diff_stat (fname)
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% -- weston_plot_rgb_diff_stat (fname, scale)
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% -- weston_plot_rgb_diff_stat (fname, scale, x_column)
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% Plot an rgb_diff_stat dump file
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%
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% Creates a new figure and draws four sub-plots: R difference,
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% G difference, B difference, and two-norm error.
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%
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% Scale defaults to 255. It is used to multiply both x and y values
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% in all plots. Note that R, G and B plots will contain horizontal lines
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% at y = +/- 0.5 to help you see the optimal rounding error range for
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% the integer encoding [0, scale]. Two-norm plot contains a horizontal
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% line at y = sqrt(0.75) which represents an error sphere with the radius
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% equal to the two-norm of RGB error (0.5, 0.5, 0.5).
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%
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% By default, x-axis is sample index, not multiplied by scale. If
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% x_column is given, it is a column index in the dump file to be used as
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% the x-axis values, multiplied by scale. Indices start from 1, not 0.
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% SPDX-FileCopyrightText: 2022 Collabora, Ltd.
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% SPDX-License-Identifier: MIT
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function weston_plot_rgb_diff_stat(fname, scale, x_column);
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S = load(fname);
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if nargin < 2
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scale = 255;
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end
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if nargin < 3
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x = 1:size(S, 1);
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else
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x = S(:, x_column) .* scale;
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end
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x_lim = [min(x) max(x)];
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evec = S(:, 1) .* scale; # two-norm error
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rvec = S(:, 2) .* scale; # r diff
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gvec = S(:, 3) .* scale; # g diff
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bvec = S(:, 4) .* scale; # b diff
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figure
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subplot(4, 1, 1);
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plot(x, rvec, 'r');
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plus_minus_half_lines(x_lim);
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title(fname, "Interpreter", "none");
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ylabel('R diff');
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axis("tight");
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subplot(4, 1, 2);
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plot(x, gvec, 'g');
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plus_minus_half_lines(x_lim);
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ylabel('G diff');
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axis("tight");
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subplot(4, 1, 3);
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plot(x, bvec, 'b');
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plus_minus_half_lines(x_lim);
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ylabel('B diff');
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axis("tight");
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subplot(4, 1, 4);
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plot(x, evec, 'k');
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hold on;
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plot(x_lim, [1 1] .* sqrt(0.75), 'k:');
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ylabel('Two-norm');
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axis("tight");
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max_abs_err = [max(abs(rvec)) max(abs(gvec)) max(abs(bvec))]
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function plus_minus_half_lines(x_lim);
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hold on;
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plot(x_lim, [0.5 -0.5; 0.5 -0.5], 'k:');
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