| /* |
| * Copyright 2015 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 "GrContextPriv.h" |
| #include "GrSurfaceContext.h" |
| #include "SkCanvas.h" |
| #include "SkGr.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; |
| } |
| } |
| } |
| |
| /** tests a conversion with an error tolerance */ |
| template <float (*CONVERT)(float)> static bool check_conversion(uint32_t input, uint32_t output, |
| float error) { |
| // alpha should always be exactly preserved. |
| if ((input & 0xff000000) != (output & 0xff000000)) { |
| return false; |
| } |
| |
| for (int c = 0; c < 3; ++c) { |
| uint8_t inputComponent = (uint8_t) ((input & (0xff << (c*8))) >> (c*8)); |
| float lower = SkTMax(0.f, (float) inputComponent - error); |
| float upper = SkTMin(255.f, (float) inputComponent + error); |
| lower = CONVERT(lower / 255.f); |
| upper = CONVERT(upper / 255.f); |
| SkASSERT(lower >= 0.f && lower <= 255.f); |
| SkASSERT(upper >= 0.f && upper <= 255.f); |
| uint8_t outputComponent = (output & (0xff << (c*8))) >> (c*8); |
| if (outputComponent < SkScalarFloorToInt(lower * 255.f) || |
| outputComponent > SkScalarCeilToInt(upper * 255.f)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** tests a forward and backward conversion with an error tolerance */ |
| template <float (*FORWARD)(float), float (*BACKWARD)(float)> |
| static bool check_double_conversion(uint32_t input, uint32_t output, float error) { |
| // alpha should always be exactly preserved. |
| if ((input & 0xff000000) != (output & 0xff000000)) { |
| return false; |
| } |
| |
| for (int c = 0; c < 3; ++c) { |
| uint8_t inputComponent = (uint8_t) ((input & (0xff << (c*8))) >> (c*8)); |
| float lower = SkTMax(0.f, (float) inputComponent - error); |
| float upper = SkTMin(255.f, (float) inputComponent + error); |
| lower = FORWARD(lower / 255.f); |
| upper = FORWARD(upper / 255.f); |
| SkASSERT(lower >= 0.f && lower <= 255.f); |
| SkASSERT(upper >= 0.f && upper <= 255.f); |
| uint8_t upperComponent = SkScalarCeilToInt(upper * 255.f); |
| uint8_t lowerComponent = SkScalarFloorToInt(lower * 255.f); |
| lower = SkTMax(0.f, (float) lowerComponent - error); |
| upper = SkTMin(255.f, (float) upperComponent + error); |
| lower = BACKWARD(lowerComponent / 255.f); |
| upper = BACKWARD(upperComponent / 255.f); |
| SkASSERT(lower >= 0.f && lower <= 255.f); |
| SkASSERT(upper >= 0.f && upper <= 255.f); |
| upperComponent = SkScalarCeilToInt(upper * 255.f); |
| lowerComponent = SkScalarFloorToInt(lower * 255.f); |
| |
| uint8_t outputComponent = (output & (0xff << (c*8))) >> (c*8); |
| if (outputComponent < lowerComponent || outputComponent > upperComponent) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| static bool check_srgb_to_linear_conversion(uint32_t srgb, uint32_t linear, float error) { |
| return check_conversion<srgb_to_linear>(srgb, linear, error); |
| } |
| |
| static bool check_linear_to_srgb_conversion(uint32_t linear, uint32_t srgb, float error) { |
| return check_conversion<linear_to_srgb>(linear, srgb, error); |
| } |
| |
| static bool check_linear_to_srgb_to_linear_conversion(uint32_t input, uint32_t output, float error) { |
| return check_double_conversion<linear_to_srgb, srgb_to_linear>(input, output, error); |
| } |
| |
| static bool check_srgb_to_linear_to_srgb_conversion(uint32_t input, uint32_t output, float error) { |
| return check_double_conversion<srgb_to_linear, linear_to_srgb>(input, output, error); |
| } |
| |
| typedef bool (*CheckFn) (uint32_t orig, uint32_t actual, float error); |
| |
| void read_and_check_pixels(skiatest::Reporter* reporter, GrSurfaceContext* context, |
| uint32_t* origData, |
| const SkImageInfo& dstInfo, CheckFn checker, float error, |
| const char* subtestName) { |
| int w = dstInfo.width(); |
| int h = dstInfo.height(); |
| SkAutoTMalloc<uint32_t> readData(w * h); |
| memset(readData.get(), 0, sizeof(uint32_t) * w * h); |
| |
| if (!context->readPixels(dstInfo, readData.get(), 0, 0, 0)) { |
| 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 orig = origData[j * w + i]; |
| uint32_t read = readData[j * w + i]; |
| |
| if (!checker(orig, read, error)) { |
| ERRORF(reporter, "Expected 0x%08x, read back as 0x%08x in %s at %d, %d).", |
| orig, read, subtestName, i, j); |
| return; |
| } |
| } |
| } |
| } |
| |
| // TODO: Add tests for copySurface between srgb/linear textures. Add tests for unpremul/premul |
| // conversion during read/write along with srgb/linear conversions. |
| DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SRGBReadWritePixels, reporter, ctxInfo) { |
| GrContext* context = ctxInfo.grContext(); |
| #if defined(GOOGLE3) |
| // Stack frame size is limited in GOOGLE3. |
| static const int kW = 63; |
| static const int kH = 63; |
| #else |
| static const int kW = 255; |
| static const int kH = 255; |
| #endif |
| uint32_t origData[kW * kH]; |
| for (int j = 0; j < kH; ++j) { |
| for (int i = 0; i < kW; ++i) { |
| origData[j * kW + i] = (j << 24) | (i << 16) | (i << 8) | i; |
| } |
| } |
| |
| const SkImageInfo iiSRGBA = SkImageInfo::Make(kW, kH, kRGBA_8888_SkColorType, |
| kPremul_SkAlphaType, |
| SkColorSpace::MakeSRGB()); |
| const SkImageInfo iiRGBA = SkImageInfo::Make(kW, kH, kRGBA_8888_SkColorType, |
| kPremul_SkAlphaType); |
| GrSurfaceDesc desc; |
| desc.fFlags = kRenderTarget_GrSurfaceFlag; |
| desc.fOrigin = kBottomLeft_GrSurfaceOrigin; |
| desc.fWidth = kW; |
| desc.fHeight = kH; |
| desc.fConfig = kSRGBA_8888_GrPixelConfig; |
| if (context->caps()->isConfigRenderable(desc.fConfig, false) && |
| context->caps()->isConfigTexturable(desc.fConfig)) { |
| |
| sk_sp<GrSurfaceContext> sContext = context->contextPriv().makeDeferredSurfaceContext( |
| desc, SkBackingFit::kExact, |
| SkBudgeted::kNo); |
| if (!sContext) { |
| ERRORF(reporter, "Could not create SRGBA surface context."); |
| return; |
| } |
| |
| float error = context->caps()->shaderCaps()->floatPrecisionVaries() ? 1.2f : 0.5f; |
| |
| // Write srgba data and read as srgba and then as rgba |
| if (sContext->writePixels(iiSRGBA, origData, 0, 0, 0)) { |
| // For the all-srgba case, we allow a small error only for devices that have |
| // precision variation because the srgba data gets converted to linear and back in |
| // the shader. |
| float smallError = context->caps()->shaderCaps()->floatPrecisionVaries() ? 1.f : 0.0f; |
| read_and_check_pixels(reporter, sContext.get(), origData, iiSRGBA, |
| check_srgb_to_linear_to_srgb_conversion, smallError, |
| "write/read srgba to srgba texture"); |
| read_and_check_pixels(reporter, sContext.get(), origData, iiRGBA, |
| check_srgb_to_linear_conversion, error, |
| "write srgba/read rgba with srgba texture"); |
| } else { |
| ERRORF(reporter, "Could not write srgba data to srgba texture."); |
| } |
| |
| // Now verify that we can write linear data |
| if (sContext->writePixels(iiRGBA, origData, 0, 0, 0)) { |
| // We allow more error on GPUs with lower precision shader variables. |
| read_and_check_pixels(reporter, sContext.get(), origData, iiSRGBA, |
| check_linear_to_srgb_conversion, error, |
| "write rgba/read srgba with srgba texture"); |
| read_and_check_pixels(reporter, sContext.get(), origData, iiRGBA, |
| check_linear_to_srgb_to_linear_conversion, error, |
| "write/read rgba with srgba texture"); |
| } else { |
| ERRORF(reporter, "Could not write rgba data to srgba texture."); |
| } |
| |
| desc.fConfig = kRGBA_8888_GrPixelConfig; |
| sContext = context->contextPriv().makeDeferredSurfaceContext(desc, SkBackingFit::kExact, |
| SkBudgeted::kNo); |
| if (!sContext) { |
| ERRORF(reporter, "Could not create RGBA surface context."); |
| return; |
| } |
| |
| // Write srgba data to a rgba texture and read back as srgba and rgba |
| if (sContext->writePixels(iiSRGBA, origData, 0, 0, 0)) { |
| #if 0 |
| // We don't support this conversion (read from untagged source into tagged destination. |
| // If we decide there is a meaningful way to implement this, restore this test. |
| read_and_check_pixels(reporter, sContext.get(), origData, iiSRGBA, |
| check_srgb_to_linear_to_srgb_conversion, error, |
| "write/read srgba to rgba texture"); |
| #endif |
| // We expect the sRGB -> linear write to do no sRGB conversion (to match the behavior of |
| // drawing tagged sources). skbug.com/6547. So the data we read should still contain |
| // sRGB encoded values. |
| // |
| // srgb_to_linear_to_srgb is a proxy for the expected identity transform. |
| read_and_check_pixels(reporter, sContext.get(), origData, iiRGBA, |
| check_srgb_to_linear_to_srgb_conversion, error, |
| "write srgba/read rgba to rgba texture"); |
| } else { |
| ERRORF(reporter, "Could not write srgba data to rgba texture."); |
| } |
| |
| // Write rgba data to a rgba texture and read back as srgba |
| if (sContext->writePixels(iiRGBA, origData, 0, 0, 0)) { |
| read_and_check_pixels(reporter, sContext.get(), origData, iiSRGBA, |
| check_linear_to_srgb_conversion, 1.2f, |
| "write rgba/read srgba to rgba texture"); |
| } else { |
| ERRORF(reporter, "Could not write rgba data to rgba texture."); |
| } |
| } |
| } |
| #endif |
