dc27a648d2
I'd like to start optimizing the common case for color xforms, but before doing that, I think it makes sense to have correct code to support all xforms. BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2038823002 Review-Url: https://codereview.chromium.org/2038823002
104 lines
4.0 KiB
C++
104 lines
4.0 KiB
C++
/*
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* Copyright 2016 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 "Resources.h"
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#include "SkCodec.h"
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#include "SkColorPriv.h"
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#include "SkColorSpace.h"
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#include "SkColorSpace_Base.h"
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#include "SkColorSpaceXform.h"
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#include "Test.h"
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class ColorSpaceXformTest {
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public:
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static SkDefaultXform* CreateDefaultXform(const sk_sp<SkGammas>& srcGamma,
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const SkMatrix44& srcToDst, const sk_sp<SkGammas>& dstGamma) {
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return new SkDefaultXform(srcGamma, srcToDst, dstGamma);
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}
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};
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static void test_xform(skiatest::Reporter* r, const sk_sp<SkGammas>& gammas) {
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// Arbitrary set of 10 pixels
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constexpr int width = 10;
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constexpr uint32_t srcPixels[width] = {
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0xFFABCDEF, 0xFF146829, 0xFF382759, 0xFF184968, 0xFFDE8271,
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0xFF32AB52, 0xFF0383BC, 0xFF000000, 0xFFFFFFFF, 0xFFDDEEFF, };
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uint32_t dstPixels[width];
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// Identity matrix
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SkMatrix44 srcToDst = SkMatrix44::I();
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// Create and perform xform
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std::unique_ptr<SkColorSpaceXform> xform(
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ColorSpaceXformTest::CreateDefaultXform(gammas, srcToDst, gammas));
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xform->xform_RGBA_8888(dstPixels, srcPixels, width);
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// Since the matrix is the identity, and the gamma curves match, the pixels
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// should be unchanged.
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for (int i = 0; i < width; i++) {
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// TODO (msarett):
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// As the implementation changes, we may want to use a tolerance here.
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REPORTER_ASSERT(r, ((srcPixels[i] >> 0) & 0xFF) == SkGetPackedR32(dstPixels[i]));
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REPORTER_ASSERT(r, ((srcPixels[i] >> 8) & 0xFF) == SkGetPackedG32(dstPixels[i]));
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REPORTER_ASSERT(r, ((srcPixels[i] >> 16) & 0xFF) == SkGetPackedB32(dstPixels[i]));
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REPORTER_ASSERT(r, ((srcPixels[i] >> 24) & 0xFF) == SkGetPackedA32(dstPixels[i]));
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}
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}
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DEF_TEST(ColorSpaceXform_TableGamma, r) {
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// Lookup-table based gamma curves
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SkGammaCurve red, green, blue;
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constexpr size_t tableSize = 10;
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red.fTable = std::unique_ptr<float[]>(new float[tableSize]);
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green.fTable = std::unique_ptr<float[]>(new float[tableSize]);
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blue.fTable = std::unique_ptr<float[]>(new float[tableSize]);
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red.fTableSize = green.fTableSize = blue.fTableSize = 10;
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red.fTable[0] = green.fTable[0] = blue.fTable[0] = 0.00f;
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red.fTable[1] = green.fTable[1] = blue.fTable[1] = 0.05f;
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red.fTable[2] = green.fTable[2] = blue.fTable[2] = 0.10f;
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red.fTable[3] = green.fTable[3] = blue.fTable[3] = 0.15f;
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red.fTable[4] = green.fTable[4] = blue.fTable[4] = 0.25f;
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red.fTable[5] = green.fTable[5] = blue.fTable[5] = 0.35f;
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red.fTable[6] = green.fTable[6] = blue.fTable[6] = 0.45f;
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red.fTable[7] = green.fTable[7] = blue.fTable[7] = 0.60f;
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red.fTable[8] = green.fTable[8] = blue.fTable[8] = 0.75f;
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red.fTable[9] = green.fTable[9] = blue.fTable[9] = 1.00f;
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sk_sp<SkGammas> gammas =
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sk_make_sp<SkGammas>(std::move(red), std::move(green), std::move(blue));
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test_xform(r, gammas);
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}
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DEF_TEST(ColorSpaceXform_ParametricGamma, r) {
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// Parametric gamma curves
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SkGammaCurve red, green, blue;
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// Interval, switch xforms at 0.5f
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red.fD = green.fD = blue.fD = 0.5f;
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// First equation, Y = 0.5f * X
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red.fE = green.fE = blue.fE = 0.5f;
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// Second equation, Y = ((1.0f * X) + 0.0f) ^ 3.0f + 0.125f
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// Note that the function is continuous:
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// 0.5f * 0.5f = ((1.0f * 0.5f) + 0.0f) ^ 3.0f + 0.125f = 0.25f
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red.fA = green.fA = blue.fA = 1.0f;
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red.fB = green.fB = blue.fB = 0.0f;
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red.fC = green.fC = blue.fC = 0.125f;
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red.fG = green.fG = blue.fG = 3.0f;
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sk_sp<SkGammas> gammas = sk_make_sp<SkGammas>(std::move(red), std::move(green), std::move(blue));
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test_xform(r, gammas);
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}
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DEF_TEST(ColorSpaceXform_ExponentialGamma, r) {
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// Exponential gamma curves
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SkGammaCurve red, green, blue;
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red.fValue = green.fValue = blue.fValue = 4.0f;
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sk_sp<SkGammas> gammas =
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sk_make_sp<SkGammas>(std::move(red), std::move(green), std::move(blue));
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test_xform(r, gammas);
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}
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