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gallium/vl: rename scale/bias variables

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This is just cleaning up some naming, so we consistently refer to things
dealing with luma as "y" and things dealing with chroma as "c".

Reviewed-by: Eric R. Smith <eric.smith@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40175>
This commit is contained in:
Erik Faye-Lund 2026-02-27 15:32:05 +01:00 • committed by Marge Bot
parent e32f7ac381
commit fdfce5c57f
1 changed files with 29 additions and 29 deletions
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58
src/gallium/auxiliary/vl/vl_csc.c
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@ -59,11 +59,11 @@ void vl_csc_get_rgbyuv_matrix(enum pipe_video_vpp_matrix_coefficients coefficien
const bool out_yuv = util_format_is_yuv(out_format);
const unsigned bpc = format_bpc(in_format);
const float scale = (1 << bpc) / ((1 << bpc) - 1.0);
const float r_min = 16.0 / 256.0 * scale;
const float r_max = 235.0 / 256.0 * scale;
const float y_min = 16.0 / 256.0 * scale;
const float y_max = 235.0 / 256.0 * scale;
const float c_mid = 128.0 / 256.0 * scale;
const float c_max = 240.0 / 256.0 * scale;
float r_scale, g_scale, r_bias, g_bias;
float y_scale, c_scale, y_bias, c_bias;
memcpy(matrix, &identity, sizeof(vl_csc_matrix));
@ -72,23 +72,23 @@ void vl_csc_get_rgbyuv_matrix(enum pipe_video_vpp_matrix_coefficients coefficien
/* Convert input to full range, chroma to [-0.5,0.5]. */
if (in_color_range == PIPE_VIDEO_VPP_CHROMA_COLOR_RANGE_REDUCED) {
r_scale = 1.0 / (r_max - r_min);
g_scale = in_yuv ? 0.5 / (c_max - c_mid) : r_scale;
r_bias = -r_min;
g_bias = in_yuv ? -c_mid : r_bias;
y_scale = 1.0 / (y_max - y_min);
c_scale = in_yuv ? 0.5 / (c_max - c_mid) : y_scale;
y_bias = -y_min;
c_bias = in_yuv ? -c_mid : y_bias;
} else if (in_yuv) {
r_scale = 1.0;
g_scale = 0.5 / (1.0 - c_mid);
r_bias = 0.0;
g_bias = -c_mid;
y_scale = 1.0;
c_scale = 0.5 / (1.0 - c_mid);
y_bias = 0.0;
c_bias = -c_mid;
} else {
r_scale = g_scale = 1.0;
r_bias = g_bias = 0.0;
y_scale = c_scale = 1.0;
y_bias = c_bias = 0.0;
}
for (unsigned i = 0; i < 3; i++) {
(*matrix)[i][i] = i == 0 ? r_scale : g_scale;
(*matrix)[i][3] = (i == 0 ? r_bias : g_bias) * (*matrix)[i][i];
(*matrix)[i][i] = i == 0 ? y_scale : c_scale;
(*matrix)[i][3] = (i == 0 ? y_bias : c_bias) * (*matrix)[i][i];
}
if (in_yuv != out_yuv) {
@ -149,32 +149,32 @@ void vl_csc_get_rgbyuv_matrix(enum pipe_video_vpp_matrix_coefficients coefficien
for (unsigned i = 0; i < 3; i++) {
for (unsigned j = 0; j < 3; j++) {
(*matrix)[i][j] *= j == 0 ? r_scale : g_scale;
(*matrix)[i][3] += (*matrix)[i][j] * (j == 0 ? r_bias : g_bias);
(*matrix)[i][j] *= j == 0 ? y_scale : c_scale;
(*matrix)[i][3] += (*matrix)[i][j] * (j == 0 ? y_bias : c_bias);
}
}
}
/* Convert output to reduced range, chroma to [0.0,1.0]. */
if (out_color_range == PIPE_VIDEO_VPP_CHROMA_COLOR_RANGE_REDUCED) {
r_scale = (r_max - r_min) / 1.0;
g_scale = in_yuv ? r_scale : (c_max - c_mid) / 0.5;
r_bias = r_min;
g_bias = in_yuv ? r_bias : c_mid;
y_scale = (y_max - y_min) / 1.0;
c_scale = in_yuv ? y_scale : (c_max - c_mid) / 0.5;
y_bias = y_min;
c_bias = in_yuv ? y_bias : c_mid;
} else if (out_yuv) {
r_scale = 1.0;
g_scale = (1.0 - c_mid) / 0.5;
r_bias = 0.0;
g_bias = c_mid;
y_scale = 1.0;
c_scale = (1.0 - c_mid) / 0.5;
y_bias = 0.0;
c_bias = c_mid;
} else {
r_scale = g_scale = 1.0;
r_bias = g_bias = 0.0;
y_scale = c_scale = 1.0;
y_bias = c_bias = 0.0;
}
for (unsigned i = 0; i < 3; i++) {
for (unsigned j = 0; j < 4; j++)
(*matrix)[i][j] *= i == 0 ? r_scale : g_scale;
(*matrix)[i][3] += i == 0 ? r_bias : g_bias;
(*matrix)[i][j] *= i == 0 ? y_scale : c_scale;
(*matrix)[i][3] += i == 0 ? y_bias : c_bias;
}
}