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| /*
| * 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"
|
| static void check_error(skiatest::Reporter* r, float limit, skcms_TransferFunction 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.
| }
|
| SkRasterPipeline_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.d) ? fn.c * in[i] + fn.f
| : powf(in[i] * fn.a + fn.b, fn.g) + fn.e;
| 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) {
| skcms_TransferFunction fn = {0,0,0,0,0,0,0};
| fn.g = gamma;
| fn.a = 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); }
|
|
