301431d751
This is pulled out of: https://skia-review.googlesource.com/c/10284/ (Remove GrSurface-derived classes from ops) Change-Id: I083c0beefe4899b3517d0b0569bb25096809f410 Reviewed-on: https://skia-review.googlesource.com/10483 Commit-Queue: Robert Phillips <robertphillips@google.com> Reviewed-by: Brian Salomon <bsalomon@google.com>
248 lines
10 KiB
C++
248 lines
10 KiB
C++
/*
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* Copyright 2015 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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#if SK_SUPPORT_GPU
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#include "GrCaps.h"
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#include "GrContext.h"
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#include "GrContextPriv.h"
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#include "GrResourceProvider.h"
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#include "GrSurfaceContext.h"
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#include "SkCanvas.h"
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#include "SkGr.h"
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#include "SkSurface.h"
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// using anonymous namespace because these functions are used as template params.
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namespace {
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/** convert 0..1 srgb value to 0..1 linear */
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float srgb_to_linear(float srgb) {
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if (srgb <= 0.04045f) {
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return srgb / 12.92f;
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} else {
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return powf((srgb + 0.055f) / 1.055f, 2.4f);
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}
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}
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/** convert 0..1 linear value to 0..1 srgb */
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float linear_to_srgb(float linear) {
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if (linear <= 0.0031308) {
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return linear * 12.92f;
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} else {
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return 1.055f * powf(linear, 1.f / 2.4f) - 0.055f;
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}
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}
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}
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/** tests a conversion with an error tolerance */
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template <float (*CONVERT)(float)> static bool check_conversion(uint32_t input, uint32_t output,
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float error) {
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// alpha should always be exactly preserved.
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if ((input & 0xff000000) != (output & 0xff000000)) {
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return false;
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}
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for (int c = 0; c < 3; ++c) {
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uint8_t inputComponent = (uint8_t) ((input & (0xff << (c*8))) >> (c*8));
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float lower = SkTMax(0.f, (float) inputComponent - error);
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float upper = SkTMin(255.f, (float) inputComponent + error);
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lower = CONVERT(lower / 255.f);
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upper = CONVERT(upper / 255.f);
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SkASSERT(lower >= 0.f && lower <= 255.f);
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SkASSERT(upper >= 0.f && upper <= 255.f);
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uint8_t outputComponent = (output & (0xff << (c*8))) >> (c*8);
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if (outputComponent < SkScalarFloorToInt(lower * 255.f) ||
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outputComponent > SkScalarCeilToInt(upper * 255.f)) {
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return false;
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}
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}
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return true;
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}
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/** tests a forward and backward conversion with an error tolerance */
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template <float (*FORWARD)(float), float (*BACKWARD)(float)>
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static bool check_double_conversion(uint32_t input, uint32_t output, float error) {
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// alpha should always be exactly preserved.
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if ((input & 0xff000000) != (output & 0xff000000)) {
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return false;
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}
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for (int c = 0; c < 3; ++c) {
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uint8_t inputComponent = (uint8_t) ((input & (0xff << (c*8))) >> (c*8));
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float lower = SkTMax(0.f, (float) inputComponent - error);
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float upper = SkTMin(255.f, (float) inputComponent + error);
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lower = FORWARD(lower / 255.f);
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upper = FORWARD(upper / 255.f);
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SkASSERT(lower >= 0.f && lower <= 255.f);
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SkASSERT(upper >= 0.f && upper <= 255.f);
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uint8_t upperComponent = SkScalarCeilToInt(upper * 255.f);
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uint8_t lowerComponent = SkScalarFloorToInt(lower * 255.f);
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lower = SkTMax(0.f, (float) lowerComponent - error);
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upper = SkTMin(255.f, (float) upperComponent + error);
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lower = BACKWARD(lowerComponent / 255.f);
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upper = BACKWARD(upperComponent / 255.f);
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SkASSERT(lower >= 0.f && lower <= 255.f);
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SkASSERT(upper >= 0.f && upper <= 255.f);
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upperComponent = SkScalarCeilToInt(upper * 255.f);
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lowerComponent = SkScalarFloorToInt(lower * 255.f);
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uint8_t outputComponent = (output & (0xff << (c*8))) >> (c*8);
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if (outputComponent < lowerComponent || outputComponent > upperComponent) {
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return false;
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}
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}
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return true;
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}
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static bool check_srgb_to_linear_conversion(uint32_t srgb, uint32_t linear, float error) {
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return check_conversion<srgb_to_linear>(srgb, linear, error);
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}
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static bool check_linear_to_srgb_conversion(uint32_t linear, uint32_t srgb, float error) {
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return check_conversion<linear_to_srgb>(linear, srgb, error);
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}
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static bool check_linear_to_srgb_to_linear_conversion(uint32_t input, uint32_t output, float error) {
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return check_double_conversion<linear_to_srgb, srgb_to_linear>(input, output, error);
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}
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static bool check_srgb_to_linear_to_srgb_conversion(uint32_t input, uint32_t output, float error) {
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return check_double_conversion<srgb_to_linear, linear_to_srgb>(input, output, error);
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}
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typedef bool (*CheckFn) (uint32_t orig, uint32_t actual, float error);
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void read_and_check_pixels(skiatest::Reporter* reporter, GrSurfaceContext* context,
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uint32_t* origData,
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const SkImageInfo& dstInfo, CheckFn checker, float error,
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const char* subtestName) {
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int w = dstInfo.width();
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int h = dstInfo.height();
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SkAutoTMalloc<uint32_t> readData(w * h);
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memset(readData.get(), 0, sizeof(uint32_t) * w * h);
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if (!context->readPixels(dstInfo, readData.get(), 0, 0, 0)) {
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ERRORF(reporter, "Could not read pixels for %s.", subtestName);
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return;
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}
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for (int j = 0; j < h; ++j) {
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for (int i = 0; i < w; ++i) {
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uint32_t orig = origData[j * w + i];
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uint32_t read = readData[j * w + i];
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if (!checker(orig, read, error)) {
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ERRORF(reporter, "Expected 0x%08x, read back as 0x%08x in %s at %d, %d).",
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orig, read, subtestName, i, j);
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return;
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}
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}
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}
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}
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// TODO: Add tests for copySurface between srgb/linear textures. Add tests for unpremul/premul
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// conversion during read/write along with srgb/linear conversions.
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DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SRGBReadWritePixels, reporter, ctxInfo) {
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GrContext* context = ctxInfo.grContext();
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#if defined(GOOGLE3)
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// Stack frame size is limited in GOOGLE3.
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static const int kW = 63;
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static const int kH = 63;
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#else
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static const int kW = 255;
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static const int kH = 255;
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#endif
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uint32_t origData[kW * kH];
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for (int j = 0; j < kH; ++j) {
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for (int i = 0; i < kW; ++i) {
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origData[j * kW + i] = (j << 24) | (i << 16) | (i << 8) | i;
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}
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}
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const SkImageInfo iiSRGBA = SkImageInfo::Make(kW, kH, kRGBA_8888_SkColorType,
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kPremul_SkAlphaType,
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SkColorSpace::MakeSRGB());
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const SkImageInfo iiRGBA = SkImageInfo::Make(kW, kH, kRGBA_8888_SkColorType,
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kPremul_SkAlphaType);
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GrSurfaceDesc desc;
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desc.fFlags = kRenderTarget_GrSurfaceFlag;
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desc.fWidth = kW;
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desc.fHeight = kH;
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desc.fConfig = kSRGBA_8888_GrPixelConfig;
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if (context->caps()->isConfigRenderable(desc.fConfig, false) &&
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context->caps()->isConfigTexturable(desc.fConfig)) {
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sk_sp<GrSurfaceContext> sContext = context->contextPriv().makeDeferredSurfaceContext(
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desc, SkBackingFit::kExact,
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SkBudgeted::kNo);
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if (!sContext) {
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ERRORF(reporter, "Could not create SRGBA surface context.");
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return;
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}
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float error = context->caps()->shaderCaps()->floatPrecisionVaries() ? 1.2f : 0.5f;
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// Write srgba data and read as srgba and then as rgba
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if (sContext->writePixels(iiSRGBA, origData, 0, 0, 0)) {
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// For the all-srgba case, we allow a small error only for devices that have
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// precision variation because the srgba data gets converted to linear and back in
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// the shader.
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float smallError = context->caps()->shaderCaps()->floatPrecisionVaries() ? 1.f : 0.0f;
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read_and_check_pixels(reporter, sContext.get(), origData, iiSRGBA,
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check_srgb_to_linear_to_srgb_conversion, smallError,
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"write/read srgba to srgba texture");
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read_and_check_pixels(reporter, sContext.get(), origData, iiRGBA,
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check_srgb_to_linear_conversion, error,
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"write srgba/read rgba with srgba texture");
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} else {
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ERRORF(reporter, "Could not write srgba data to srgba texture.");
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}
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// Now verify that we can write linear data
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if (sContext->writePixels(iiRGBA, origData, 0, 0, 0)) {
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// We allow more error on GPUs with lower precision shader variables.
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read_and_check_pixels(reporter, sContext.get(), origData, iiSRGBA,
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check_linear_to_srgb_conversion, error,
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"write rgba/read srgba with srgba texture");
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read_and_check_pixels(reporter, sContext.get(), origData, iiRGBA,
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check_linear_to_srgb_to_linear_conversion, error,
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"write/read rgba with srgba texture");
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} else {
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ERRORF(reporter, "Could not write rgba data to srgba texture.");
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}
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desc.fConfig = kRGBA_8888_GrPixelConfig;
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sContext = context->contextPriv().makeDeferredSurfaceContext(desc, SkBackingFit::kExact,
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SkBudgeted::kNo);
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if (!sContext) {
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ERRORF(reporter, "Could not create RGBA surface context.");
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return;
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}
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// Write srgba data to a rgba texture and read back as srgba and rgba
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if (sContext->writePixels(iiSRGBA, origData, 0, 0, 0)) {
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read_and_check_pixels(reporter, sContext.get(), origData, iiSRGBA,
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check_srgb_to_linear_to_srgb_conversion, error,
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"write/read srgba to rgba texture");
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read_and_check_pixels(reporter, sContext.get(), origData, iiRGBA,
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check_srgb_to_linear_conversion, error,
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"write srgba/read rgba to rgba texture");
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} else {
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ERRORF(reporter, "Could not write srgba data to rgba texture.");
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}
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// Write rgba data to a rgba texture and read back as srgba
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if (sContext->writePixels(iiRGBA, origData, 0, 0, 0)) {
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read_and_check_pixels(reporter, sContext.get(), origData, iiSRGBA,
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check_linear_to_srgb_conversion, 1.2f,
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"write rgba/read srgba to rgba texture");
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} else {
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ERRORF(reporter, "Could not write rgba data to rgba texture.");
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}
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}
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}
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#endif
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