| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "Test.h" |
| #if SK_SUPPORT_GPU |
| #include "GrCaps.h" |
| #include "GrContext.h" |
| #include "GrRenderTargetContext.h" |
| #include "SkCanvas.h" |
| #include "SkSurface.h" |
| |
| // using anonymous namespace because these functions are used as template params. |
| namespace { |
| /** convert 0..1 srgb value to 0..1 linear */ |
| float srgb_to_linear(float srgb) { |
| if (srgb <= 0.04045f) { |
| return srgb / 12.92f; |
| } else { |
| return powf((srgb + 0.055f) / 1.055f, 2.4f); |
| } |
| } |
| |
| /** convert 0..1 linear value to 0..1 srgb */ |
| float linear_to_srgb(float linear) { |
| if (linear <= 0.0031308) { |
| return linear * 12.92f; |
| } else { |
| return 1.055f * powf(linear, 1.f / 2.4f) - 0.055f; |
| } |
| } |
| } |
| |
| static bool check_value(U8CPU value, U8CPU expected, U8CPU error) { |
| if (value >= expected) { |
| return (value - expected) <= error; |
| } else { |
| return (expected - value) <= error; |
| } |
| } |
| |
| void read_and_check_pixels(skiatest::Reporter* reporter, GrTexture* texture, U8CPU expected, |
| U8CPU error, const char* subtestName) { |
| int w = texture->width(); |
| int h = texture->height(); |
| SkAutoTMalloc<uint32_t> readData(w * h); |
| memset(readData.get(), 0, sizeof(uint32_t) * w * h); |
| if (!texture->readPixels(0, 0, w, h, texture->config(), readData.get())) { |
| ERRORF(reporter, "Could not read pixels for %s.", subtestName); |
| return; |
| } |
| for (int j = 0; j < h; ++j) { |
| for (int i = 0; i < w; ++i) { |
| uint32_t read = readData[j * w + i]; |
| |
| bool success = |
| check_value(read & 0xff, expected, error) && |
| check_value((read >> 8) & 0xff, expected, error) && |
| check_value((read >> 16) & 0xff, expected, error); |
| |
| if (!success) { |
| ERRORF(reporter, "Expected 0xff%02x%02x%02x, read back as 0x%08x in %s at %d, %d.", |
| expected, expected, expected, read, subtestName, i, j); |
| return; |
| } |
| } |
| } |
| } |
| |
| DEF_GPUTEST_FOR_GL_RENDERING_CONTEXTS(SRGBMipMaps, reporter, ctxInfo) { |
| GrContext* context = ctxInfo.grContext(); |
| if (!context->caps()->srgbSupport()) { |
| return; |
| } |
| |
| const int rtS = 16; |
| const int texS = rtS * 2; |
| |
| // Fill texture with a dither of black and 60% sRGB (~ 32.5% linear) gray. Although there is |
| // only one likely failure mode (doing a direct downsample of the sRGB values), this pattern |
| // maximizes the minimum error across all three conceivable failure modes: |
| // 1) Likely incorrect: |
| // (A + B) / 2 |
| // 2) No input decode, decode output: |
| // linear_to_srgb((A + B) / 2) |
| // 3) Decode input, no output encode: |
| // (srgb_to_linear(A) + srgb_to_linear(B)) / 2 |
| |
| const U8CPU srgb60 = sk_float_round2int(0.6f * 255.0f); |
| static const SkPMColor colors[2] = { |
| SkPackARGB32(0xFF, srgb60, srgb60, srgb60), |
| SkPackARGB32(0xFF, 0x00, 0x00, 0x00) |
| }; |
| uint32_t texData[texS * texS]; |
| for (int y = 0; y < texS; ++y) { |
| for (int x = 0; x < texS; ++x) { |
| texData[y * texS + x] = colors[(x + y) % 2]; |
| } |
| } |
| |
| // We can be pretty generous with the error detection, thanks to the choice of input. |
| // The closest likely failure mode is off by > 0.1, so anything that encodes within |
| // 10/255 of optimal is more than good enough for this test. |
| const U8CPU expectedSRGB = sk_float_round2int( |
| linear_to_srgb(srgb_to_linear(srgb60 / 255.0f) / 2.0f) * 255.0f); |
| const U8CPU expectedLinear = srgb60 / 2; |
| const U8CPU error = 10; |
| |
| // Create our test texture |
| GrSurfaceDesc desc; |
| desc.fFlags = kNone_GrSurfaceFlags; |
| desc.fConfig = kSRGBA_8888_GrPixelConfig; |
| desc.fWidth = texS; |
| desc.fHeight = texS; |
| |
| GrTextureProvider* texProvider = context->textureProvider(); |
| SkAutoTUnref<GrTexture> texture(texProvider->createTexture(desc, SkBudgeted::kNo, texData, 0)); |
| |
| // Create two render target contexts (L32 and S32) |
| sk_sp<SkColorSpace> srgbColorSpace = SkColorSpace::MakeNamed(SkColorSpace::kSRGB_Named); |
| sk_sp<GrRenderTargetContext> l32RenderTargetContext = context->makeRenderTargetContext( |
| SkBackingFit::kExact, rtS, rtS, kRGBA_8888_GrPixelConfig, nullptr); |
| sk_sp<GrRenderTargetContext> s32RenderTargetContext = context->makeRenderTargetContext( |
| SkBackingFit::kExact, rtS, rtS, kSRGBA_8888_GrPixelConfig, std::move(srgbColorSpace)); |
| |
| SkRect rect = SkRect::MakeWH(SkIntToScalar(rtS), SkIntToScalar(rtS)); |
| GrNoClip noClip; |
| GrPaint paint; |
| paint.setPorterDuffXPFactory(SkBlendMode::kSrc); |
| GrTextureParams mipMapParams(SkShader::kRepeat_TileMode, GrTextureParams::kMipMap_FilterMode); |
| paint.addColorTextureProcessor(texture, nullptr, SkMatrix::MakeScale(0.5f), mipMapParams); |
| |
| // 1) Draw texture to S32 surface (should generate/use sRGB mips) |
| paint.setGammaCorrect(true); |
| s32RenderTargetContext->drawRect(noClip, paint, SkMatrix::I(), rect); |
| read_and_check_pixels(reporter, s32RenderTargetContext->asTexture().get(), expectedSRGB, error, |
| "first render of sRGB"); |
| |
| // 2) Draw texture to L32 surface (should generate/use linear mips) |
| paint.setGammaCorrect(false); |
| l32RenderTargetContext->drawRect(noClip, paint, SkMatrix::I(), rect); |
| read_and_check_pixels(reporter, l32RenderTargetContext->asTexture().get(), expectedLinear, |
| error, "re-render as linear"); |
| |
| // 3) Go back to sRGB |
| paint.setGammaCorrect(true); |
| s32RenderTargetContext->drawRect(noClip, paint, SkMatrix::I(), rect); |
| read_and_check_pixels(reporter, s32RenderTargetContext->asTexture().get(), expectedSRGB, error, |
| "re-render as sRGB"); |
| } |
| #endif |