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+From 59c9e3a4aeb4753be97b3817d106816d9a4ebe73 Mon Sep 17 00:00:00 2001
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+From: Adrian Perez de Castro <aperez@igalia.com>
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+Date: Thu, 2 Jun 2022 11:19:06 +0300
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+Subject: [PATCH] FELightningNEON.cpp fails to build, NEON fast path seems
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+ unused https://bugs.webkit.org/show_bug.cgi?id=241182
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+
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+Reviewed by NOBODY (OOPS!).
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+
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+Move the NEON fast path for the SVG lighting filter effects into
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+FELightingSoftwareApplier, and arrange to actually use them by
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+forwarding calls to applyPlatformGeneric() into applyPlatformNeon().
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+
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+Some changes were needed to adapt platformApplyNeon() to the current
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+state of filters after r286140. This was not detected because the code
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+bitrotted due to it being guarded with CPU(ARM_TRADITIONAL), which does
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+not get used much these days: CPU(ARM_THUMB2) is more common. It should
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+be possible to use the NEON fast paths also in Thumb mode, but that is
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+left for a follow-up fix.
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+
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+* Source/WebCore/Sources.txt:
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+* Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.cpp:
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+(WebCore::FELightingSoftwareApplier::platformApplyNeonWorker):
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+(WebCore::FELightingSoftwareApplier::getPowerCoefficients):
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+(WebCore::FELighting::platformApplyNeonWorker): Deleted.
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+(WebCore::FELighting::getPowerCoefficients): Deleted.
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+* Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.h:
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+(WebCore::FELightingSoftwareApplier::applyPlatformNeon):
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+(WebCore::FELighting::platformApplyNeon): Deleted.
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+* Source/WebCore/platform/graphics/filters/DistantLightSource.h:
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+* Source/WebCore/platform/graphics/filters/FELighting.h:
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+* Source/WebCore/platform/graphics/filters/PointLightSource.h:
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+* Source/WebCore/platform/graphics/filters/SpotLightSource.h:
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+* Source/WebCore/platform/graphics/filters/software/FELightingSoftwareApplier.h:
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+
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+Signed-off-by: Adrian Perez de Castro <aperez@igalia.com>
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+[Upstream status: https://bugs.webkit.org/show_bug.cgi?id=241182]
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+---
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+ .../cpu/arm/filters/FELightingNEON.cpp | 4 +-
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+ .../graphics/cpu/arm/filters/FELightingNEON.h | 52 +++++++++----------
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+ .../graphics/filters/DistantLightSource.h | 4 ++
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+ .../platform/graphics/filters/FELighting.h | 7 ---
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+ .../graphics/filters/PointLightSource.h | 4 ++
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+ .../graphics/filters/SpotLightSource.h | 4 ++
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+ .../software/FELightingSoftwareApplier.h | 16 ++++++
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+ 7 files changed, 56 insertions(+), 35 deletions(-)
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+
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+diff --git a/Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.cpp b/Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.cpp
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+index f6ff8c20a5a8..42a97ffc5372 100644
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+--- a/Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.cpp
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++++ b/Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.cpp
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+@@ -49,7 +49,7 @@ short* feLightingConstantsForNeon()
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+ return s_FELightingConstantsForNeon;
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+ }
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+
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+-void FELighting::platformApplyNeonWorker(FELightingPaintingDataForNeon* parameters)
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++void FELightingSoftwareApplier::platformApplyNeonWorker(FELightingPaintingDataForNeon* parameters)
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+ {
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+ neonDrawLighting(parameters);
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+ }
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+@@ -464,7 +464,7 @@ TOSTRING(neonDrawLighting) ":" NL
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+ "b .lightStrengthCalculated" NL
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+ ); // NOLINT
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+
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+-int FELighting::getPowerCoefficients(float exponent)
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++int FELightingSoftwareApplier::getPowerCoefficients(float exponent)
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+ {
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+ // Calling a powf function from the assembly code would require to save
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+ // and reload a lot of NEON registers. Since the base is in range [0..1]
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+diff --git a/Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.h b/Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.h
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+index b17c603d40d3..e4629cda0b7c 100644
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+--- a/Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.h
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++++ b/Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.h
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+@@ -24,14 +24,15 @@
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+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ */
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+
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+-#ifndef FELightingNEON_h
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+-#define FELightingNEON_h
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++#pragma once
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+
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+ #if CPU(ARM_NEON) && CPU(ARM_TRADITIONAL) && COMPILER(GCC_COMPATIBLE)
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+
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+-#include "FELighting.h"
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++#include "FELightingSoftwareApplier.h"
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++#include "ImageBuffer.h"
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+ #include "PointLightSource.h"
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+ #include "SpotLightSource.h"
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++#include <wtf/ObjectIdentifier.h>
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+ #include <wtf/ParallelJobs.h>
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+
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+ namespace WebCore {
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+@@ -93,14 +94,14 @@ extern "C" {
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+ void neonDrawLighting(FELightingPaintingDataForNeon*);
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+ }
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+
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+-inline void FELighting::platformApplyNeon(const LightingData& data, const LightSource::PaintingData& paintingData)
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++inline void FELightingSoftwareApplier::applyPlatformNeon(const FELightingSoftwareApplier::LightingData& data, const LightSource::PaintingData& paintingData)
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+ {
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+- alignas(16) FELightingFloatArgumentsForNeon floatArguments;
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+- FELightingPaintingDataForNeon neonData = {
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++ WebCore::FELightingFloatArgumentsForNeon alignas(16) floatArguments;
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++ WebCore::FELightingPaintingDataForNeon neonData = {
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+ data.pixels->data(),
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+ 1,
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+- data.widthDecreasedByOne - 1,
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+- data.heightDecreasedByOne - 1,
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++ data.width - 2,
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++ data.height - 2,
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+ 0,
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+ 0,
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+ 0,
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+@@ -111,23 +112,23 @@ inline void FELighting::platformApplyNeon(const LightingData& data, const LightS
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+ // Set light source arguments.
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+ floatArguments.constOne = 1;
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+
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+- auto color = m_lightingColor.toColorTypeLossy<SRGBA<uint8_t>>().resolved();
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++ auto color = data.lightingColor.toColorTypeLossy<SRGBA<uint8_t>>().resolved();
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+
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+ floatArguments.colorRed = color.red;
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+ floatArguments.colorGreen = color.green;
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+ floatArguments.colorBlue = color.blue;
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+ floatArguments.padding4 = 0;
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+
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+- if (m_lightSource->type() == LS_POINT) {
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++ if (data.lightSource->type() == LS_POINT) {
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+ neonData.flags |= FLAG_POINT_LIGHT;
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+- PointLightSource& pointLightSource = static_cast<PointLightSource&>(m_lightSource.get());
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++ const auto& pointLightSource = *static_cast<const PointLightSource*>(data.lightSource);
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+ floatArguments.lightX = pointLightSource.position().x();
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+ floatArguments.lightY = pointLightSource.position().y();
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+ floatArguments.lightZ = pointLightSource.position().z();
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+ floatArguments.padding2 = 0;
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+- } else if (m_lightSource->type() == LS_SPOT) {
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++ } else if (data.lightSource->type() == LS_SPOT) {
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+ neonData.flags |= FLAG_SPOT_LIGHT;
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+- SpotLightSource& spotLightSource = static_cast<SpotLightSource&>(m_lightSource.get());
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++ const auto& spotLightSource = *static_cast<const SpotLightSource*>(data.lightSource);
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+ floatArguments.lightX = spotLightSource.position().x();
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+ floatArguments.lightY = spotLightSource.position().y();
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+ floatArguments.lightZ = spotLightSource.position().z();
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+@@ -145,7 +146,7 @@ inline void FELighting::platformApplyNeon(const LightingData& data, const LightS
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+ if (spotLightSource.specularExponent() == 1)
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+ neonData.flags |= FLAG_CONE_EXPONENT_IS_1;
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+ } else {
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+- ASSERT(m_lightSource->type() == LS_DISTANT);
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++ ASSERT(data.lightSource->type() == LS_DISTANT);
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+ floatArguments.lightX = paintingData.initialLightingData.lightVector.x();
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+ floatArguments.lightY = paintingData.initialLightingData.lightVector.y();
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+ floatArguments.lightZ = paintingData.initialLightingData.lightVector.z();
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+@@ -155,38 +156,39 @@ inline void FELighting::platformApplyNeon(const LightingData& data, const LightS
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+ // Set lighting arguments.
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+ floatArguments.surfaceScale = data.surfaceScale;
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+ floatArguments.minusSurfaceScaleDividedByFour = -data.surfaceScale / 4;
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+- if (m_lightingType == FELighting::DiffuseLighting)
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+- floatArguments.diffuseConstant = m_diffuseConstant;
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++ if (data.filterType == FilterEffect::Type::FEDiffuseLighting)
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++ floatArguments.diffuseConstant = data.diffuseConstant;
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+ else {
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+ neonData.flags |= FLAG_SPECULAR_LIGHT;
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+- floatArguments.diffuseConstant = m_specularConstant;
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+- neonData.specularExponent = getPowerCoefficients(m_specularExponent);
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+- if (m_specularExponent == 1)
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++ floatArguments.diffuseConstant = data.specularConstant;
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++ neonData.specularExponent = getPowerCoefficients(data.specularExponent);
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++ if (data.specularExponent == 1)
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+ neonData.flags |= FLAG_SPECULAR_EXPONENT_IS_1;
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+ }
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+ if (floatArguments.diffuseConstant == 1)
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+ neonData.flags |= FLAG_DIFFUSE_CONST_IS_1;
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+
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+- int optimalThreadNumber = ((data.widthDecreasedByOne - 1) * (data.heightDecreasedByOne - 1)) / s_minimalRectDimension;
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++ static constexpr int minimalRectDimension = 100 * 100; // Empirical data limit for parallel jobs
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++ int optimalThreadNumber = ((data.width - 2) * (data.height - 2)) / minimalRectDimension;
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+ if (optimalThreadNumber > 1) {
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+ // Initialize parallel jobs
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+- ParallelJobs<FELightingPaintingDataForNeon> parallelJobs(&WebCore::FELighting::platformApplyNeonWorker, optimalThreadNumber);
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++ ParallelJobs<FELightingPaintingDataForNeon> parallelJobs(&FELightingSoftwareApplier::platformApplyNeonWorker, optimalThreadNumber);
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+
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+ // Fill the parameter array
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+ int job = parallelJobs.numberOfJobs();
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+ if (job > 1) {
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+ int yStart = 1;
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+- int yStep = (data.heightDecreasedByOne - 1) / job;
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++ int yStep = (data.height - 2) / job;
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+ for (--job; job >= 0; --job) {
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+ FELightingPaintingDataForNeon& params = parallelJobs.parameter(job);
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+ params = neonData;
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+ params.yStart = yStart;
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+- params.pixels += (yStart - 1) * (data.widthDecreasedByOne + 1) * 4;
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++ params.pixels += (yStart - 1) * data.width * 4;
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+ if (job > 0) {
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+ params.absoluteHeight = yStep;
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+ yStart += yStep;
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+ } else
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+- params.absoluteHeight = data.heightDecreasedByOne - yStart;
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++ params.absoluteHeight = (data.height - 1) - yStart;
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+ }
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+ parallelJobs.execute();
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+ return;
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+@@ -199,5 +201,3 @@ inline void FELighting::platformApplyNeon(const LightingData& data, const LightS
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+ } // namespace WebCore
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+
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+ #endif // CPU(ARM_NEON) && COMPILER(GCC_COMPATIBLE)
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+-
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+-#endif // FELightingNEON_h
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+diff --git a/Source/WebCore/platform/graphics/filters/DistantLightSource.h b/Source/WebCore/platform/graphics/filters/DistantLightSource.h
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+index 0660143fc1cf..2b1e86d99fa4 100644
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+--- a/Source/WebCore/platform/graphics/filters/DistantLightSource.h
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++++ b/Source/WebCore/platform/graphics/filters/DistantLightSource.h
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+@@ -25,6 +25,10 @@
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+ #include "LightSource.h"
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+ #include <wtf/Ref.h>
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+
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++namespace WTF {
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++class TextStream;
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++} // namespace WTF
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++
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+ namespace WebCore {
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+
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+ class DistantLightSource : public LightSource {
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+diff --git a/Source/WebCore/platform/graphics/filters/FELighting.h b/Source/WebCore/platform/graphics/filters/FELighting.h
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+index 0c073bc13f8c..e0db00545c17 100644
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+--- a/Source/WebCore/platform/graphics/filters/FELighting.h
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++++ b/Source/WebCore/platform/graphics/filters/FELighting.h
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+@@ -35,8 +35,6 @@
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+
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+ namespace WebCore {
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+
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+-struct FELightingPaintingDataForNeon;
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+-
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+ class FELighting : public FilterEffect {
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+ public:
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+ const Color& lightingColor() const { return m_lightingColor; }
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+@@ -67,11 +65,6 @@ protected:
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+
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+ std::unique_ptr<FilterEffectApplier> createSoftwareApplier() const override;
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+
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+-#if CPU(ARM_NEON) && CPU(ARM_TRADITIONAL) && COMPILER(GCC_COMPATIBLE)
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+- static int getPowerCoefficients(float exponent);
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+- inline void platformApplyNeon(const LightingData&, const LightSource::PaintingData&);
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+-#endif
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+-
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+ Color m_lightingColor;
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+ float m_surfaceScale;
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+ float m_diffuseConstant;
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+diff --git a/Source/WebCore/platform/graphics/filters/PointLightSource.h b/Source/WebCore/platform/graphics/filters/PointLightSource.h
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+index 5c9c7fb783e6..e53aa012ac1c 100644
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+--- a/Source/WebCore/platform/graphics/filters/PointLightSource.h
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++++ b/Source/WebCore/platform/graphics/filters/PointLightSource.h
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+@@ -26,6 +26,10 @@
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+ #include "LightSource.h"
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+ #include <wtf/Ref.h>
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+
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++namespace WTF {
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++class TextStream;
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++} // namespace WTF
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++
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+ namespace WebCore {
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+
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+ class PointLightSource : public LightSource {
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+diff --git a/Source/WebCore/platform/graphics/filters/SpotLightSource.h b/Source/WebCore/platform/graphics/filters/SpotLightSource.h
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+index 04e331ec4ec0..763c8d400b00 100644
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+--- a/Source/WebCore/platform/graphics/filters/SpotLightSource.h
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++++ b/Source/WebCore/platform/graphics/filters/SpotLightSource.h
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+@@ -26,6 +26,10 @@
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+ #include "LightSource.h"
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+ #include <wtf/Ref.h>
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+
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++namespace WTF {
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++class TextStream;
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++} // namespace WTF
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++
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+ namespace WebCore {
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+
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+ class SpotLightSource : public LightSource {
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+diff --git a/Source/WebCore/platform/graphics/filters/software/FELightingSoftwareApplier.h b/Source/WebCore/platform/graphics/filters/software/FELightingSoftwareApplier.h
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+index 3875b0a4b5de..6d3864aafb9a 100644
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+--- a/Source/WebCore/platform/graphics/filters/software/FELightingSoftwareApplier.h
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++++ b/Source/WebCore/platform/graphics/filters/software/FELightingSoftwareApplier.h
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+@@ -36,6 +36,7 @@
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+ namespace WebCore {
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+
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+ class FELighting;
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++struct FELightingPaintingDataForNeon;
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+
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+ class FELightingSoftwareApplier final : public FilterEffectConcreteApplier<FELighting> {
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+ WTF_MAKE_FAST_ALLOCATED;
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+@@ -132,8 +133,23 @@ private:
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+
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+ static void applyPlatformGenericPaint(const LightingData&, const LightSource::PaintingData&, int startY, int endY);
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+ static void applyPlatformGenericWorker(ApplyParameters*);
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++
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++#if CPU(ARM_NEON) && CPU(ARM_TRADITIONAL) && COMPILER(GCC_COMPATIBLE)
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++ static int getPowerCoefficients(float exponent);
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++ static void platformApplyNeonWorker(FELightingPaintingDataForNeon*);
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++ inline static void applyPlatformNeon(const LightingData&, const LightSource::PaintingData&);
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++
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++ inline static void applyPlatformGeneric(const LightingData& data, const LightSource::PaintingData& paintingData)
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++ {
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++ applyPlatformNeon(data, paintingData);
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++ }
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++#else
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+ static void applyPlatformGeneric(const LightingData&, const LightSource::PaintingData&);
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++#endif
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++
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+ static void applyPlatform(const LightingData&);
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+ };
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+
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+ } // namespace WebCore
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++
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++#include "FELightingNEON.h"
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+--
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+2.37.3
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+
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