4eebd9eed0
parametric_a and gamma_dst were unused outside of unit tests.
In all other cases, we always use parametric_{r,g,b} together
and always pass them the same argument. So we can collapse
them into a single stage like gamma and to/from_srgb.
Change-Id: I08cea896c7744f97b4f4bf9e029f5d643e45e177
Reviewed-on: https://skia-review.googlesource.com/140576
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Brian Osman <brianosman@google.com>
80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
/*
|
|
* Copyright 2017 Google Inc.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
#include "SkColorSpace.h"
|
|
#include "SkRasterPipeline.h"
|
|
#include "Test.h"
|
|
#include "../src/jumper/SkJumper.h"
|
|
|
|
static void check_error(skiatest::Reporter* r, float limit, SkColorSpaceTransferFn fn) {
|
|
float in[256], out[256];
|
|
for (int i = 0; i < 256; i++) {
|
|
in [i] = i / 255.0f;
|
|
out[i] = 0.0f; // Not likely important. Just being tidy.
|
|
}
|
|
|
|
SkJumper_MemoryCtx ip = { in, 0},
|
|
op = {out, 0};
|
|
|
|
SkRasterPipeline_<256> p;
|
|
p.append(SkRasterPipeline::load_f32, &ip);
|
|
p.append(SkRasterPipeline::parametric, &fn);
|
|
p.append(SkRasterPipeline::store_f32, &op);
|
|
|
|
p.run(0,0, 256/4,1);
|
|
|
|
|
|
for (int i = 0; i < 256; i++) {
|
|
float want = (in[i] <= fn.fD) ? fn.fC * in[i] + fn.fF
|
|
: powf(in[i] * fn.fA + fn.fB, fn.fG) + fn.fE;
|
|
if (i % 4 == 3) { // alpha should stay unchanged.
|
|
want = in[i];
|
|
}
|
|
float err = fabsf(out[i] - want);
|
|
if (err > limit) {
|
|
ERRORF(r, "At %d, error was %g (got %g, want %g)", i, err, out[i], want);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void check_error(skiatest::Reporter* r, float limit, float gamma) {
|
|
SkColorSpaceTransferFn fn = {0,0,0,0,0,0,0};
|
|
fn.fG = gamma;
|
|
fn.fA = 1;
|
|
check_error(r, limit, fn);
|
|
}
|
|
|
|
DEF_TEST(Parametric_sRGB, r) {
|
|
// Test our good buddy the sRGB transfer function in resplendent 7-parameter glory.
|
|
check_error(r, 1/510.0f, {
|
|
2.4f,
|
|
1.0f / 1.055f,
|
|
0.055f / 1.055f,
|
|
1.0f / 12.92f,
|
|
0.04045f,
|
|
0.0f,
|
|
0.0f,
|
|
});
|
|
}
|
|
|
|
// A nice little spread of simple gammas.
|
|
DEF_TEST(Parametric_1dot0, r) { check_error(r, 1/510.0f, 1.0f); }
|
|
|
|
DEF_TEST(Parametric_1dot2, r) { check_error(r, 1/510.0f, 1.2f); }
|
|
DEF_TEST(Parametric_1dot4, r) { check_error(r, 1/510.0f, 1.4f); }
|
|
DEF_TEST(Parametric_1dot8, r) { check_error(r, 1/510.0f, 1.8f); }
|
|
DEF_TEST(Parametric_2dot0, r) { check_error(r, 1/510.0f, 2.0f); }
|
|
DEF_TEST(Parametric_2dot2, r) { check_error(r, 1/510.0f, 2.2f); }
|
|
DEF_TEST(Parametric_2dot4, r) { check_error(r, 1/510.0f, 2.4f); }
|
|
|
|
DEF_TEST(Parametric_inv_1dot2, r) { check_error(r, 1/510.0f, 1/1.2f); }
|
|
DEF_TEST(Parametric_inv_1dot4, r) { check_error(r, 1/510.0f, 1/1.4f); }
|
|
DEF_TEST(Parametric_inv_1dot8, r) { check_error(r, 1/510.0f, 1/1.8f); }
|
|
DEF_TEST(Parametric_inv_2dot0, r) { check_error(r, 1/510.0f, 1/2.0f); }
|
|
DEF_TEST(Parametric_inv_2dot2, r) { check_error(r, 1/510.0f, 1/2.2f); }
|
|
DEF_TEST(Parametric_inv_2dot4, r) { check_error(r, 1/510.0f, 1/2.4f); }
|