77 lines
2.7 KiB
C++
77 lines
2.7 KiB
C++
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/*
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* Copyright 2018 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 "Test.h"
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#include "SkHalf.h"
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#include "SkSurface.h"
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#include "SkCanvas.h"
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DEF_TEST(NonlinearBlending, r) {
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// First check our familiar basics with linear F16.
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{
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auto info = SkImageInfo::Make(1,1, kRGBA_F16_SkColorType, kPremul_SkAlphaType,
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SkColorSpace::MakeSRGBLinear());
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auto surface = SkSurface::MakeRaster(info);
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surface->getCanvas()->clear(0xff808080);
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uint64_t pix;
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REPORTER_ASSERT(r, surface->readPixels(info, &pix, sizeof(pix),0,0));
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// 0x80 in sRGB is ≈ 0.22 linear.
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REPORTER_ASSERT(r, SkHalfToFloat(pix & 0xffff) < 0.25f);
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}
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// Test that we support sRGB-encoded F16. This is somewhat new.
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{
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auto info = SkImageInfo::Make(1,1, kRGBA_F16_SkColorType, kPremul_SkAlphaType,
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SkColorSpace::MakeSRGB());
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auto surface = SkSurface::MakeRaster(info);
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surface->getCanvas()->clear(0xff808080);
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uint64_t pix;
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REPORTER_ASSERT(r, surface->readPixels(info, &pix, sizeof(pix),0,0));
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// 0x80 sRGB is ≈ 0.501.
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REPORTER_ASSERT(r, SkHalfToFloat(pix & 0xffff) >= 0.5f);
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}
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// Since we're only clear()ing, this should work the same as the last block.
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{
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auto info = SkImageInfo::Make(1,1, kRGBA_F16_SkColorType, kPremul_SkAlphaType,
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SkColorSpace::MakeSRGB()->makeNonlinearBlending());
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auto surface = SkSurface::MakeRaster(info);
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surface->getCanvas()->clear(0xff808080);
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uint64_t pix;
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REPORTER_ASSERT(r, surface->readPixels(info, &pix, sizeof(pix),0,0));
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// 0x80 sRGB is ≈ 0.501.
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REPORTER_ASSERT(r, SkHalfToFloat(pix & 0xffff) >= 0.5f);
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}
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// This won't work until we actually support color spaces with non-linear blending.
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if (0) {
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auto info = SkImageInfo::Make(1,1, kRGBA_F16_SkColorType, kPremul_SkAlphaType,
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SkColorSpace::MakeSRGB()->makeNonlinearBlending());
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auto surface = SkSurface::MakeRaster(info);
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surface->getCanvas()->clear(SK_ColorWHITE);
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SkPaint p;
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p.setColor(0x80000000);
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surface->getCanvas()->drawPaint(p);
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uint64_t pix;
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REPORTER_ASSERT(r, surface->readPixels(info, &pix, sizeof(pix),0,0));
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// 0x80 sRGB is ≈ 0.501. A likely failure here is ~0.75, linear blending.
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REPORTER_ASSERT(r, SkHalfToFloat(pix & 0xffff) >= 0.45f &&
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SkHalfToFloat(pix & 0xffff) <= 0.55f);
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}
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}
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