[igt-dev] [RFC PATCH 5/7] igt/color: Add SW color transform functionality
Harry Wentland
harry.wentland at amd.com
Fri Sep 8 15:03:13 UTC 2023
In order to test color we want to compare a HW (KMS) transform
with a SW transform. This introduces color transform for an
sRGB EOTF but this can be extended to other transforms. Code is
borrowed from Skia.
Signed-off-by: Harry Wentland <harry.wentland at amd.com>
Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
Cc: Pekka Paalanen <pekka.paalanen at collabora.com>
Cc: Simon Ser <contact at emersion.fr>
Cc: Harry Wentland <harry.wentland at amd.com>
Cc: Melissa Wen <mwen at igalia.com>
Cc: Jonas Ådahl <jadahl at redhat.com>
Cc: Sebastian Wick <sebastian.wick at redhat.com>
Cc: Shashank Sharma <shashank.sharma at amd.com>
Cc: Alexander Goins <agoins at nvidia.com>
Cc: Joshua Ashton <joshua at froggi.es>
Cc: Michel Dänzer <mdaenzer at redhat.com>
Cc: Aleix Pol <aleixpol at kde.org>
Cc: Xaver Hugl <xaver.hugl at gmail.com>
Cc: Victoria Brekenfeld <victoria at system76.com>
Cc: Daniel Vetter <daniel at ffwll.ch>
Cc: Uma Shankar <uma.shankar at intel.com>
Cc: Naseer Ahmed <quic_naseer at quicinc.com>
Cc: Christopher Braga <quic_cbraga at quicinc.com>
---
lib/igt_color.c | 330 ++++++++++++++++++++++++++++++++++++++++++++++++
lib/igt_color.h | 105 +++++++++++++++
lib/igt_fb.c | 6 +-
lib/igt_fb.h | 2 +
lib/meson.build | 1 +
5 files changed, 441 insertions(+), 3 deletions(-)
create mode 100644 lib/igt_color.c
create mode 100644 lib/igt_color.h
diff --git a/lib/igt_color.c b/lib/igt_color.c
new file mode 100644
index 000000000000..12ff9ad1f324
--- /dev/null
+++ b/lib/igt_color.c
@@ -0,0 +1,330 @@
+/*
+ * Copyright 2023 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <errno.h>
+#include <math.h>
+
+#include "igt_color.h"
+#include "igt_core.h"
+#include "igt_x86.h"
+
+
+static float clamp(float val, float min, float max)
+{
+ return ((val < min) ? min : ((val > max) ? max : val));
+}
+
+/*
+ * Below code is taken from Skia and adapted for style and needs of
+ * IGT.
+ *
+ * https://chromium.googlesource.com/chromium/src/+/3e1a26c44c024d97dc9a4c09bbc6a2365398ca2c/ui/gfx/skia_color_space_util.cc#15
+ *
+ * To comply with the original code's license we'll include it, as well
+ * as the original copyright here:
+ *
+ * // Copyright 2015 The Chromium Authors
+ * //
+ * // Redistribution and use in source and binary forms, with or without
+ * // modification, are permitted provided that the following conditions are
+ * // met:
+ * //
+ * // * Redistributions of source code must retain the above copyright
+ * // notice, this list of conditions and the following disclaimer.
+ * // * Redistributions in binary form must reproduce the above
+ * // copyright notice, this list of conditions and the following disclaimer
+ * // in the documentation and/or other materials provided with the
+ * // distribution.
+ * // * Neither the name of Google LLC nor the names of its
+ * // contributors may be used to endorse or promote products derived from
+ * // this software without specific prior written permission.
+ * //
+ * // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+static float igt_color_tf_eval_unclamped(const struct igt_color_tf *fn, float x)
+{
+ if (x < fn->d)
+ return fn->c * x + fn->f;
+ return pow(fn->a * x + fn->b, fn->g) + fn->e;
+}
+
+static float igt_color_tf_eval(const struct igt_color_tf *fn, float x)
+{
+ float fn_at_x_unclamped = igt_color_tf_eval_unclamped(fn, x);
+ return clamp(fn_at_x_unclamped, 0.0f, 1.0f);
+}
+
+#if 0
+skcms_TransferFunction SkTransferFnInverse(const skcms_TransferFunction& fn) {
+ skcms_TransferFunction fn_inv = {0};
+ if (fn.a > 0 && fn.g > 0) {
+ double a_to_the_g = std::pow(fn.a, fn.g);
+ fn_inv.a = 1.f / a_to_the_g;
+ fn_inv.b = -fn.e / a_to_the_g;
+ fn_inv.g = 1.f / fn.g;
+ }
+ fn_inv.d = fn.c * fn.d + fn.f;
+ fn_inv.e = -fn.b / fn.a;
+ if (fn.c != 0) {
+ fn_inv.c = 1.f / fn.c;
+ fn_inv.f = -fn.f / fn.c;
+ }
+ return fn_inv;
+}
+#endif
+
+/* end of Skia-based code */
+
+static void igt_color_srgb_inv_eotf(igt_pixel_t *pixel)
+{
+}
+
+
+
+static void igt_color_srgb_eotf(igt_pixel_t *pixel)
+{
+ pixel->r = igt_color_tf_eval(&srgb_tf, pixel->r);
+ pixel->g = igt_color_tf_eval(&srgb_tf, pixel->g);
+ pixel->b = igt_color_tf_eval(&srgb_tf, pixel->b);
+}
+
+int igt_color_transform_pixels(igt_fb_t *fb, igt_pixel_transform transform)
+{
+ uint32_t *line = NULL;
+ void *map;
+ char *ptr;
+ int x, y, cpp = igt_drm_format_to_bpp(fb->drm_format) / 8;
+ uint32_t stride = igt_fb_calc_plane_stride(fb, 0);
+
+ if (fb->num_planes != 1)
+ return -EINVAL;
+
+ /* TODO expand for other formats */
+ if (fb->drm_format != DRM_FORMAT_XRGB8888)
+ return -EINVAL;
+
+ ptr = igt_fb_map_buffer(fb->fd, fb);
+ igt_assert(ptr);
+ map = ptr;
+
+ /*
+ * Framebuffers are often uncached, which can make byte-wise accesses
+ * very slow. We copy each line of the FB into a local buffer to speed
+ * up the hashing.
+ */
+ line = malloc(stride);
+ if (!line) {
+ munmap(map, fb->size);
+ return -ENOMEM;
+ }
+
+ for (y = 0; y < fb->height; y++, ptr += stride) {
+
+ /* get line from buffer */
+ igt_memcpy_from_wc(line, ptr, fb->width * cpp);
+
+ for (x = 0; x < fb->width; x++) {
+ uint32_t raw_pixel = le32_to_cpu(line[x]);
+ igt_pixel_t pixel;
+ raw_pixel &= 0x00ffffff;
+
+ /*
+ * unpack pixel into igt_pixel_t
+ *
+ * only for XRGB8888 for now
+ *
+ * TODO add "generic" mechanism for unpacking
+ * other FB formats
+ */
+ pixel.r = (raw_pixel & 0x00ff0000) >> 16;
+ pixel.g = (raw_pixel & 0x0000ff00) >> 8;
+ pixel.b = (raw_pixel & 0x000000ff);
+
+ /* normalize for 8-bit */
+ pixel.r /= (0xff);
+ pixel.g /= (0xff);
+ pixel.b /= (0xff);
+
+ /* TODO use read_rgb from igt_fb? */
+
+ /* run transform on pixel */
+ transform(&pixel);
+
+ /* de-normalize back to 8-bit */
+ pixel.r *= (0xff);
+ pixel.g *= (0xff);
+ pixel.b *= (0xff);
+
+ /* re-pack pixel into FB*/
+ raw_pixel = 0x0;
+ raw_pixel |= ((uint8_t) (lround(pixel.r) & 0xff)) << 16;
+ raw_pixel |= ((uint8_t) (lround(pixel.g) & 0xff)) << 8;
+ raw_pixel |= ((uint8_t) (lround(pixel.b) & 0xff));
+ /* TODO use write_rgb from igt_fb? */
+
+ /* write back to line */
+ line[x] = cpu_to_le32(raw_pixel);
+ }
+
+ /* copy line back to fb buffer */
+ igt_memcpy_from_wc(ptr, line, fb->width * cpp);
+ }
+
+ free(line);
+ igt_fb_unmap_buffer(fb, map);
+
+ return 0;
+
+ /* for each pixel */
+
+ /* convert to float and create igt_pixel */
+
+ /* call transform */
+
+ /* convert back to fb format from igt_pixel */
+
+
+}
+
+int igt_color_transform_srgb_eotf(igt_fb_t *fb)
+{
+ return igt_color_transform_pixels(fb, &igt_color_srgb_eotf);
+}
+
+int igt_color_transform_srgb_inv_eotf(igt_fb_t *fb)
+{
+ return igt_color_transform_pixels(fb, &igt_color_srgb_inv_eotf);
+}
+
+#if 0
+#define PRINT_PIXEL_CMP
+#endif
+
+bool igt_cmp_fb_component(uint16_t comp1, uint16_t comp2, uint8_t up, uint8_t down)
+{
+ int16_t diff = comp2 - comp1;
+
+ if ((diff < -down) || (diff > up)) {
+ printf("comp1 %x comp2 %x diff %d down %d, up %d\n", comp1, comp2, diff, -down, up);
+ return false;
+ }
+
+ return true;
+}
+
+bool igt_cmp_fb_pixels(igt_fb_t *fb1, igt_fb_t *fb2, uint8_t up, uint8_t down)
+{
+ uint32_t *ptr1, *ptr2;
+ uint32_t pixel1, pixel2, i, j;
+ bool matched = true;
+
+#ifdef PRINT_PIXEL_CMP
+ printf("hwhw: %s %d\n", __func__, __LINE__);
+#endif
+
+ ptr1 = igt_fb_map_buffer(fb1->fd, fb1);
+ ptr2 = igt_fb_map_buffer(fb2->fd, fb2);
+
+ igt_assert(fb1->drm_format == fb2->drm_format);
+ igt_assert(fb1->size == fb2->size);
+
+ for (i = 0; i < fb1->size / sizeof(uint32_t); i++) {
+ uint16_t mask = 0xff;
+ uint16_t shift = 8;
+
+ if (fb1->drm_format == DRM_FORMAT_XRGB2101010) {
+ /* ignore alpha */
+ pixel1 = ptr1[i] & ~0xc0000000;
+ pixel2 = ptr2[i] & ~0xc0000000;
+
+ mask = 0x3ff;
+ shift = 10;
+
+
+ } else if (fb1->drm_format == DRM_FORMAT_XRGB8888) {
+ /* ignore alpha */
+ pixel1 = ptr1[i] & ~0xff000000;
+ pixel2 = ptr2[i] & ~0xff000000;
+
+ mask = 0xff;
+ shift = 8;
+
+ } else {
+ pixel1 = ptr1[i];
+ pixel2 = ptr2[i];
+ }
+
+#ifdef PRINT_PIXEL_CMP
+ /* print first 5 pixels */
+ if (i < 5) {
+ printf("hwhw: %s %u\n", __func__, i);
+ printf("\t\traw_in\t%u\n", ptr1[i]);
+ printf("\t\traw_out\t%u\n", ptr2[i]);
+ printf("\t\tin\t%u\n", pixel1);
+ printf("\t\tout\t%u\n", pixel2);
+ }
+#endif
+
+ for (j = 0; j < 3; j++) {
+ uint16_t comp1 = (pixel1 >> (shift*j)) & mask;
+ uint16_t comp2 = (pixel2 >> (shift*j)) & mask;
+
+ if (!igt_cmp_fb_component(comp1, comp2, up, down)) {
+ /* TODO use proper log*/
+ printf("i %d j %d shift %d mask %x comp1 %x comp2 %x, pixel1 %x pixel2 %x\n",
+ i, j, shift, mask, comp1, comp2, pixel1, pixel2);
+ return false;
+ }
+ }
+ }
+
+ igt_fb_unmap_buffer(fb1, ptr1);
+ igt_fb_unmap_buffer(fb2, ptr2);
+
+ return matched;
+}
+
+
+void igt_dump_fb(igt_display_t *display, igt_fb_t *fb,
+ const char *path_name, const char *file_name)
+{
+ char filepath_out[PATH_MAX];
+ cairo_surface_t *fb_surface_out;
+ cairo_status_t status;
+
+ snprintf(filepath_out, PATH_MAX, "%s/%s.png", path_name, file_name);
+ fb_surface_out = igt_get_cairo_surface(display->drm_fd, fb);
+ status = cairo_surface_write_to_png(fb_surface_out, filepath_out);
+ igt_assert_eq(status, CAIRO_STATUS_SUCCESS);
+ cairo_surface_destroy(fb_surface_out);
+}
\ No newline at end of file
diff --git a/lib/igt_color.h b/lib/igt_color.h
new file mode 100644
index 000000000000..fc136eecfd17
--- /dev/null
+++ b/lib/igt_color.h
@@ -0,0 +1,105 @@
+/*
+ * Copyright 2023 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+#ifndef __IGT_COLOR_H__
+#define __IGT_COLOR_H__
+
+#include <limits.h>
+
+#include "igt_fb.h"
+#include "igt_kms.h"
+
+/*
+ * Below code is taken from Skia and adapted for style and needs of
+ * IGT.
+ *
+ * https://chromium.googlesource.com/chromium/src/+/3e1a26c44c024d97dc9a4c09bbc6a2365398ca2c/ui/gfx/skia_color_space_util.cc#15
+ *
+ * To comply with the original code's license we'll include it, as well
+ * as the original copyright here:
+ *
+ * // Copyright 2015 The Chromium Authors
+ * //
+ * // Redistribution and use in source and binary forms, with or without
+ * // modification, are permitted provided that the following conditions are
+ * // met:
+ * //
+ * // * Redistributions of source code must retain the above copyright
+ * // notice, this list of conditions and the following disclaimer.
+ * // * Redistributions in binary form must reproduce the above
+ * // copyright notice, this list of conditions and the following disclaimer
+ * // in the documentation and/or other materials provided with the
+ * // distribution.
+ * // * Neither the name of Google LLC nor the names of its
+ * // contributors may be used to endorse or promote products derived from
+ * // this software without specific prior written permission.
+ * //
+ * // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+/*
+ * A transfer function mapping encoded values to linear values,
+ * represented by this 7-parameter piecewise function:
+ *
+ * linear = sign(encoded) * (c*|encoded| + f) , 0 <= |encoded| < d
+ * = sign(encoded) * ((a*|encoded| + b)^g + e), d <= |encoded|
+ *
+ * (A simple gamma transfer function sets g to gamma and a to 1.)
+ */
+struct igt_color_tf {
+ float g, a,b,c,d,e,f;
+};
+
+const struct igt_color_tf srgb_tf = {2.4f, (float)(1/1.055), (float)(0.055/1.055), (float)(1/12.92), 0.04045f, 0, 0};
+
+/* end of Skia-based code */
+
+typedef struct igt_pixel {
+ float r;
+ float g;
+ float b;
+} igt_pixel_t;
+
+bool igt_cmp_fb_component(uint16_t comp1, uint16_t comp2, uint8_t up, uint8_t down);
+bool igt_cmp_fb_pixels(igt_fb_t *fb1, igt_fb_t *fb2, uint8_t up, uint8_t down);
+
+void igt_dump_fb(igt_display_t *display, igt_fb_t *fb, const char *path_name, const char *file_name);
+
+/* TODO also allow 64-bit pixels, or other weird sizes */
+typedef void (*igt_pixel_transform)(igt_pixel_t *pixel);
+
+int igt_color_transform_pixels(igt_fb_t *fb, igt_pixel_transform transform);
+
+int igt_color_transform_srgb_eotf(igt_fb_t *fb);
+int igt_color_transform_srgb_inv_eotf(igt_fb_t *fb);
+
+#endif
\ No newline at end of file
diff --git a/lib/igt_fb.c b/lib/igt_fb.c
index 0fe5b6adf8f4..0667d3fcbcff 100644
--- a/lib/igt_fb.c
+++ b/lib/igt_fb.c
@@ -739,7 +739,7 @@ void igt_init_fb(struct igt_fb *fb, int fd, int width, int height,
}
}
-static uint32_t calc_plane_stride(struct igt_fb *fb, int plane)
+uint32_t igt_fb_calc_plane_stride(struct igt_fb *fb, int plane)
{
uint32_t min_stride = fb->plane_width[plane] *
(fb->plane_bpp[plane] / 8);
@@ -916,7 +916,7 @@ static uint64_t calc_fb_size(struct igt_fb *fb)
/* respect the stride requested by the caller */
if (!fb->strides[plane])
- fb->strides[plane] = calc_plane_stride(fb, plane);
+ fb->strides[plane] = igt_fb_calc_plane_stride(fb, plane);
align = get_plane_alignment(fb, plane);
if (align)
@@ -4471,7 +4471,7 @@ int igt_fb_get_fnv1a_crc(struct igt_fb *fb, igt_crc_t *crc)
void *map;
char *ptr;
int x, y, cpp = igt_drm_format_to_bpp(fb->drm_format) / 8;
- uint32_t stride = calc_plane_stride(fb, 0);
+ uint32_t stride = igt_fb_calc_plane_stride(fb, 0);
if (fb->num_planes != 1)
return -EINVAL;
diff --git a/lib/igt_fb.h b/lib/igt_fb.h
index 73bdfc8669d8..b753c1580884 100644
--- a/lib/igt_fb.h
+++ b/lib/igt_fb.h
@@ -170,6 +170,8 @@ int igt_dirty_fb(int fd, struct igt_fb *fb);
void *igt_fb_map_buffer(int fd, struct igt_fb *fb);
void igt_fb_unmap_buffer(struct igt_fb *fb, void *buffer);
+uint32_t igt_fb_calc_plane_stride(struct igt_fb *fb, int plane);
+
void igt_create_bo_for_fb(int fd, int width, int height,
uint32_t format, uint64_t modifier,
struct igt_fb *fb);
diff --git a/lib/meson.build b/lib/meson.build
index 85f100f75510..7c9aa56d429c 100644
--- a/lib/meson.build
+++ b/lib/meson.build
@@ -97,6 +97,7 @@ lib_sources = [
'igt_edid.c',
'igt_eld.c',
'igt_infoframe.c',
+ 'igt_color.c',
'veboxcopy_gen12.c',
'igt_msm.c',
'igt_dsc.c',
--
2.42.0
More information about the igt-dev
mailing list