8f2911f840
Change-Id: I7fab6d1c7240c17f2cc8436e8c6e7c8d2df940bb Reviewed-on: https://skia-review.googlesource.com/13814 Reviewed-by: Matt Sarett <msarett@google.com> Commit-Queue: Mike Klein <mtklein@chromium.org>
76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
/*
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* Copyright 2017 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkColorSpace.h"
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#include "SkRasterPipeline.h"
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#include "Test.h"
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static void check_error(skiatest::Reporter* r, float limit, SkColorSpaceTransferFn fn) {
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float in[256], out[256];
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for (int i = 0; i < 256; i++) {
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in [i] = i / 255.0f;
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out[i] = 0.0f; // Not likely important. Just being tidy.
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}
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const float* ip = in;
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float* op = out;
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SkRasterPipeline p;
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p.append(SkRasterPipeline::load_f32, &ip);
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p.append(SkRasterPipeline::parametric_r, &fn);
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p.append(SkRasterPipeline::parametric_g, &fn);
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p.append(SkRasterPipeline::parametric_b, &fn);
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p.append(SkRasterPipeline::parametric_a, &fn);
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p.append(SkRasterPipeline::store_f32, &op);
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p.run(0, 256/4);
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for (int i = 0; i < 256; i++) {
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float want = (in[i] <= fn.fD) ? fn.fC * in[i] + fn.fF
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: powf(in[i] * fn.fA + fn.fB, fn.fG) + fn.fE;
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float err = fabsf(out[i] - want);
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if (err > limit) {
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ERRORF(r, "At %d, error was %g (got %g, want %g)", i, err, out[i], want);
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}
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}
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}
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static void check_error(skiatest::Reporter* r, float limit, float gamma) {
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check_error(r, limit, { gamma, 1.0f,0,0,0,0,0 });
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}
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DEF_TEST(Parametric_sRGB, r) {
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// Test our good buddy the sRGB transfer function in resplendent 7-parameter glory.
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check_error(r, 1/510.0f, {
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2.4f,
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1.0f / 1.055f,
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0.055f / 1.055f,
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1.0f / 12.92f,
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0.04045f,
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0.0f,
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0.0f,
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});
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}
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// A nice little spread of simple gammas.
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DEF_TEST(Parametric_1dot0, r) { check_error(r, 1/510.0f, 1.0f); }
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DEF_TEST(Parametric_1dot2, r) { check_error(r, 1/510.0f, 1.2f); }
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DEF_TEST(Parametric_1dot4, r) { check_error(r, 1/510.0f, 1.4f); }
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DEF_TEST(Parametric_1dot8, r) { check_error(r, 1/510.0f, 1.8f); }
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DEF_TEST(Parametric_2dot0, r) { check_error(r, 1/510.0f, 2.0f); }
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DEF_TEST(Parametric_2dot2, r) { check_error(r, 1/510.0f, 2.2f); }
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DEF_TEST(Parametric_2dot4, r) { check_error(r, 1/510.0f, 2.4f); }
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DEF_TEST(Parametric_inv_1dot2, r) { check_error(r, 1/510.0f, 1/1.2f); }
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DEF_TEST(Parametric_inv_1dot4, r) { check_error(r, 1/510.0f, 1/1.4f); }
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DEF_TEST(Parametric_inv_1dot8, r) { check_error(r, 1/510.0f, 1/1.8f); }
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DEF_TEST(Parametric_inv_2dot0, r) { check_error(r, 1/510.0f, 1/2.0f); }
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DEF_TEST(Parametric_inv_2dot2, r) { check_error(r, 1/510.0f, 1/2.2f); }
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DEF_TEST(Parametric_inv_2dot4, r) { check_error(r, 1/510.0f, 1/2.4f); }
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