libs/renderengine/skia/Cache.cpp - platform/frameworks/native - Git at Google

 /*
  * Copyright 2021 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 #include "Cache.h"
 #include "AutoBackendTexture.h"
 #include "SkiaRenderEngine.h"
 #include "android-base/unique_fd.h"
 #include "renderengine/DisplaySettings.h"
 #include "renderengine/LayerSettings.h"
 #include "renderengine/impl/ExternalTexture.h"
 #include "ui/GraphicBuffer.h"
 #include "ui/GraphicTypes.h"
 #include "ui/PixelFormat.h"
 #include "ui/Rect.h"
 #include "utils/Timers.h"

 namespace android::renderengine::skia {

 namespace {
 // Warming shader cache, not framebuffer cache.
 constexpr bool kUseFrameBufferCache = false;

 // clang-format off
 // Any non-identity matrix will do.
 const auto kScaleAndTranslate = mat4(0.7f,   0.f, 0.f, 0.f,
                                      0.f,  0.7f, 0.f, 0.f,
                                      0.f,   0.f, 1.f, 0.f,
                                    67.3f, 52.2f, 0.f, 1.f);
 const auto kScaleAsymmetric = mat4(0.8f, 0.f,  0.f, 0.f,
                                    0.f,  1.1f, 0.f, 0.f,
                                    0.f,  0.f,  1.f, 0.f,
                                    0.f,  0.f,  0.f, 1.f);
 const auto kFlip = mat4(1.1f, -0.1f,  0.f, 0.f,
                         0.1f,  1.1f,  0.f, 0.f,
                         0.f,    0.f,  1.f, 0.f,
                         2.f,    2.f,  0.f, 1.f);
 // clang-format on
 // When setting layer.sourceDataspace, whether it matches the destination or not determines whether
 // a color correction effect is added to the shader.
 constexpr auto kDestDataSpace = ui::Dataspace::SRGB;
 constexpr auto kOtherDataSpace = ui::Dataspace::DISPLAY_P3;
 } // namespace

 static void drawShadowLayers(SkiaRenderEngine* renderengine, const DisplaySettings& display,
                              const std::shared_ptr<ExternalTexture>& dstTexture) {
     // Somewhat arbitrary dimensions, but on screen and slightly shorter, based
     // on actual use.
     const Rect& displayRect = display.physicalDisplay;
     FloatRect rect(0, 0, displayRect.width(), displayRect.height());
     FloatRect smallerRect(20, 20, displayRect.width()-20, displayRect.height()-20);

     LayerSettings layer{
             .geometry =
                     Geometry{
                             .boundaries = rect,
                             .roundedCornersCrop = rect,
                             .roundedCornersRadius = 50.f,
                     },
             // drawShadow ignores alpha
             .shadow =
                     ShadowSettings{
                             .boundaries = rect,
                             .ambientColor = vec4(0, 0, 0, 0.00935997f),
                             .spotColor = vec4(0, 0, 0, 0.0455841f),
                             .lightPos = vec3(500.f, -1500.f, 1500.f),
                             .lightRadius = 2500.0f,
                             .length = 15.f,
                     },
             // setting this is mandatory for shadows and blurs
             .skipContentDraw = true,
             .alpha = 1,
     };
     LayerSettings caster{
             .geometry =
                     Geometry{
                             .boundaries = smallerRect,
                             .roundedCornersCrop = rect,
                             .roundedCornersRadius = 50.f,
                     },
             .source =
                     PixelSource{
                             .solidColor = half3(0.f, 0.f, 0.f),
                     },
             .alpha = 1,
     };

     auto layers = std::vector<LayerSettings>{layer, caster};
     // Four combinations of settings are used (two transforms here, and drawShadowLayers is
     // called with two different destination data spaces) They're all rounded rect.
     // Three of these are cache misses that generate new shaders.
     // The first combination generates a short and simple shadow shader.
     // The second combination, flip transform, generates two shaders. The first appears to involve
     //   gaussian_fp. The second is a long and general purpose shadow shader with a device space
     //   transformation stage.
     // The third combination is a cache hit, nothing new.
     // The fourth combination, flip transform with a non-SRGB destination dataspace, is new.
     //   It is unique in that nearly everything is done in the vertex shader, and that vertex shader
     //   requires color correction. This is triggered differently from every other instance of color
     //   correction. All other instances are triggered when src and dst dataspaces differ, while
     //   this one is triggered by the destination being non-srgb. Apparently since the third
     //   combination is a cache hit, this color correction is only added when the vertex shader is
     //   doing something non-trivial.
     for (auto transform : {mat4(), kFlip}) {
         layer.geometry.positionTransform = transform;
         caster.geometry.positionTransform = transform;
         renderengine->drawLayers(display, layers, dstTexture, kUseFrameBufferCache,
                                  base::unique_fd());
     }
 }

 static void drawImageLayers(SkiaRenderEngine* renderengine, const DisplaySettings& display,
                             const std::shared_ptr<ExternalTexture>& dstTexture,
                             const std::shared_ptr<ExternalTexture>& srcTexture) {
     const Rect& displayRect = display.physicalDisplay;
     FloatRect rect(0, 0, displayRect.width(), displayRect.height());
     LayerSettings layer{
             .geometry =
                     Geometry{
                             // The position transform doesn't matter when the reduced shader mode
                             // in in effect. A matrix transform stage is always included.
                             .positionTransform = mat4(),
                             .boundaries = rect,
                             .roundedCornersCrop = rect,
                     },
             .source = PixelSource{.buffer =
                                           Buffer{
                                                   .buffer = srcTexture,
                                                   .maxLuminanceNits = 1000.f,
                                           }},
     };

     auto layers = std::vector<LayerSettings>{layer};
     for (auto dataspace : {kDestDataSpace, kOtherDataSpace}) {
         layer.sourceDataspace = dataspace;
         // Cache shaders for both rects and round rects.
         // In reduced shader mode, all non-zero round rect radii get the same code path.
         for (float roundedCornersRadius : {0.0f, 50.0f}) {
             // roundedCornersCrop is always set, but the radius triggers the behavior
             layer.geometry.roundedCornersRadius = roundedCornersRadius;
             for (bool isOpaque : {true, false}) {
                 layer.source.buffer.isOpaque = isOpaque;
                 for (auto alpha : {half(.2f), half(1.0f)}) {
                     layer.alpha = alpha;
                     renderengine->drawLayers(display, layers, dstTexture, kUseFrameBufferCache,
                                              base::unique_fd());
                 }
             }
         }
     }
 }

 static void drawSolidLayers(SkiaRenderEngine* renderengine, const DisplaySettings& display,
                             const std::shared_ptr<ExternalTexture>& dstTexture) {
     const Rect& displayRect = display.physicalDisplay;
     FloatRect rect(0, 0, displayRect.width(), displayRect.height());
     LayerSettings layer{
             .geometry =
                     Geometry{
                             .boundaries = rect,
                     },
             .source =
                     PixelSource{
                             .solidColor = half3(0.1f, 0.2f, 0.3f),
                     },
             .alpha = 0.5,
     };

     auto layers = std::vector<LayerSettings>{layer};
     for (auto transform : {mat4(), kScaleAndTranslate}) {
         layer.geometry.positionTransform = transform;
         for (float roundedCornersRadius : {0.0f, 50.f}) {
             layer.geometry.roundedCornersRadius = roundedCornersRadius;
             renderengine->drawLayers(display, layers, dstTexture, kUseFrameBufferCache,
                                      base::unique_fd());
         }
     }
 }

 static void drawBlurLayers(SkiaRenderEngine* renderengine, const DisplaySettings& display,
                            const std::shared_ptr<ExternalTexture>& dstTexture) {
     const Rect& displayRect = display.physicalDisplay;
     FloatRect rect(0, 0, displayRect.width(), displayRect.height());
     LayerSettings layer{
             .geometry =
                     Geometry{
                             .boundaries = rect,
                     },
             .alpha = 1,
             // setting this is mandatory for shadows and blurs
             .skipContentDraw = true,
     };

     auto layers = std::vector<LayerSettings>{layer};
     // Different blur code is invoked for radii less and greater than 30 pixels
     for (int radius : {9, 60}) {
         layer.backgroundBlurRadius = radius;
         renderengine->drawLayers(display, layers, dstTexture, kUseFrameBufferCache,
                                  base::unique_fd());
     }
 }

 // The unique feature of these layers is that the boundary is slightly smaller than the rounded
 // rect crop, so the rounded edges intersect that boundary and require a different clipping method.
 // For buffers, this is done with a stage that computes coverage and it will differ for round and
 // elliptical corners.
 static void drawClippedLayers(SkiaRenderEngine* renderengine, const DisplaySettings& display,
                               const std::shared_ptr<ExternalTexture>& dstTexture,
                               const std::shared_ptr<ExternalTexture>& srcTexture) {
     const Rect& displayRect = display.physicalDisplay;
     FloatRect rect(0, 0, displayRect.width(), displayRect.height() - 20); // boundary is smaller

     PixelSource bufferSource{.buffer = Buffer{
                                      .buffer = srcTexture,
                                      .isOpaque = 0,
                                      .maxLuminanceNits = 1000.f,
                              }};
     PixelSource bufferOpaque{.buffer = Buffer{
                                      .buffer = srcTexture,
                                      .isOpaque = 1,
                                      .maxLuminanceNits = 1000.f,
                              }};
     PixelSource colorSource{.solidColor = half3(0.1f, 0.2f, 0.3f)};

     LayerSettings layer{
             .geometry =
                     Geometry{
                             .boundaries = rect,
                             .roundedCornersRadius = 27, // larger than the 20 above.
                             .roundedCornersCrop =
                                     FloatRect(0, 0, displayRect.width(), displayRect.height()),
                     },
     };

     auto layers = std::vector<LayerSettings>{layer};
     for (auto pixelSource : {bufferSource, bufferOpaque, colorSource}) {
         layer.source = pixelSource;
         for (auto dataspace : {kDestDataSpace, kOtherDataSpace}) {
             layer.sourceDataspace = dataspace;
             // Produce a CircularRRect clip and an EllipticalRRect clip.
             for (auto transform : {kScaleAndTranslate, kScaleAsymmetric}) {
                 layer.geometry.positionTransform = transform;
                 for (float alpha : {0.5f, 1.f}) {
                     layer.alpha = alpha,
                     renderengine->drawLayers(display, layers, dstTexture, kUseFrameBufferCache,
                                              base::unique_fd());
                 }
             }
         }
     }
 }

 static void drawPIPImageLayer(SkiaRenderEngine* renderengine, const DisplaySettings& display,
                             const std::shared_ptr<ExternalTexture>& dstTexture,
                             const std::shared_ptr<ExternalTexture>& srcTexture) {
     const Rect& displayRect = display.physicalDisplay;
     FloatRect rect(0, 0, displayRect.width(), displayRect.height());
     LayerSettings layer{
             .geometry =
                     Geometry{
                             // Note that this flip matrix only makes a difference when clipping,
                             // which happens in this layer because the roundrect crop is just a bit
                             // larger than the layer bounds.
                             .positionTransform = kFlip,
                             .boundaries = rect,
                             .roundedCornersRadius = 94.2551,
                             .roundedCornersCrop = FloatRect(
                                 -93.75, 0, displayRect.width() + 93.75, displayRect.height()),
                     },
             .source = PixelSource{.buffer =
                                           Buffer{
                                                   .buffer = srcTexture,
                                                   .maxLuminanceNits = 1000.f,
                                                   .isOpaque = 0,
                                                   .usePremultipliedAlpha = 1,
                                           }},
             .sourceDataspace = kOtherDataSpace,
             .alpha = 1,

     };

     auto layers = std::vector<LayerSettings>{layer};
     renderengine->drawLayers(display, layers, dstTexture, kUseFrameBufferCache, base::unique_fd());
 }

 static void drawHolePunchLayer(SkiaRenderEngine* renderengine, const DisplaySettings& display,
                             const std::shared_ptr<ExternalTexture>& dstTexture) {
     const Rect& displayRect = display.physicalDisplay;
     FloatRect rect(0, 0, displayRect.width(), displayRect.height());
     FloatRect small(0, 0, displayRect.width()-20, displayRect.height()+20);
     LayerSettings layer{
             .geometry =
                     Geometry{
                             .positionTransform = kScaleAndTranslate,
                             // the boundaries have to be smaller than the rounded crop so that
                             // clipRRect is used instead of drawRRect
                             .boundaries = small,
                             .roundedCornersRadius = 50.f,
                             .roundedCornersCrop = rect,
                     },
             .source = PixelSource{
                             .solidColor = half3(0.f, 0.f, 0.f),
                     },
             .sourceDataspace = kDestDataSpace,
             .alpha = 0,
             .disableBlending = true,

     };

     auto layers = std::vector<LayerSettings>{layer};
     renderengine->drawLayers(display, layers, dstTexture, kUseFrameBufferCache, base::unique_fd());
 }

 //
 // The collection of shaders cached here were found by using perfetto to record shader compiles
 // during actions that involve RenderEngine, logging the layer settings, and the shader code
 // and reproducing those settings here.
 //
 // It is helpful when debugging this to turn on
 // in SkGLRenderEngine.cpp:
 //    kPrintLayerSettings = true
 //    kFlushAfterEveryLayer = true
 // in external/skia/src/gpu/gl/builders/GrGLShaderStringBuilder.cpp
 //    gPrintSKSL = true
 void Cache::primeShaderCache(SkiaRenderEngine* renderengine) {
     const int previousCount = renderengine->reportShadersCompiled();
     if (previousCount) {
         ALOGD("%d Shaders already compiled before Cache::primeShaderCache ran\n", previousCount);
     }

     // The loop is beneficial for debugging and should otherwise be optimized out by the compiler.
     // Adding additional bounds to the loop is useful for verifying that the size of the dst buffer
     // does not impact the shader compilation counts by triggering different behaviors in RE/Skia.
     for (SkSize bounds : {SkSize::Make(128, 128), /*SkSize::Make(1080, 2340)*/}) {
         const nsecs_t timeBefore = systemTime();
         // The dimensions should not matter, so long as we draw inside them.
         const Rect displayRect(0, 0, bounds.fWidth, bounds.fHeight);
         DisplaySettings display{
                 .physicalDisplay = displayRect,
                 .clip = displayRect,
                 .maxLuminance = 500,
                 .outputDataspace = kDestDataSpace,
         };
         DisplaySettings p3Display{
                 .physicalDisplay = displayRect,
                 .clip = displayRect,
                 .maxLuminance = 500,
                 .outputDataspace = kOtherDataSpace,
         };

         const int64_t usage = GRALLOC_USAGE_HW_RENDER | GRALLOC_USAGE_HW_TEXTURE;

         sp<GraphicBuffer> dstBuffer =
                 new GraphicBuffer(displayRect.width(), displayRect.height(), PIXEL_FORMAT_RGBA_8888,
                                   1, usage, "primeShaderCache_dst");

         const auto dstTexture =
                 std::make_shared<impl::ExternalTexture>(dstBuffer, *renderengine,
                                                         impl::ExternalTexture::Usage::WRITEABLE);
         // This buffer will be the source for the call to drawImageLayers. Draw
         // something to it as a placeholder for what an app draws. We should draw
         // something, but the details are not important. Make use of the shadow layer drawing step
         // to populate it.
         sp<GraphicBuffer> srcBuffer =
                 new GraphicBuffer(displayRect.width(), displayRect.height(), PIXEL_FORMAT_RGBA_8888,
                                   1, usage, "drawImageLayer_src");

         const auto srcTexture = std::make_shared<
                 impl::ExternalTexture>(srcBuffer, *renderengine,
                                        impl::ExternalTexture::Usage::READABLE |
                                                impl::ExternalTexture::Usage::WRITEABLE);
         drawHolePunchLayer(renderengine, display, dstTexture);
         drawSolidLayers(renderengine, display, dstTexture);

         drawShadowLayers(renderengine, display, srcTexture);
         drawShadowLayers(renderengine, p3Display, srcTexture);

         if (renderengine->supportsBackgroundBlur()) {
             drawBlurLayers(renderengine, display, dstTexture);
         }

         // The majority of skia shaders needed by RenderEngine are related to sampling images.
         // These need to be generated with various source textures.
         // Make a list of applicable sources.
         // GRALLOC_USAGE_HW_TEXTURE should be the same as AHARDWAREBUFFER_USAGE_GPU_SAMPLED_IMAGE.
         const int64_t usageExternal = GRALLOC_USAGE_HW_TEXTURE;
         sp<GraphicBuffer> externalBuffer =
                 new GraphicBuffer(displayRect.width(), displayRect.height(), PIXEL_FORMAT_RGBA_8888,
                                   1, usageExternal, "primeShaderCache_external");
         const auto externalTexture =
                 std::make_shared<impl::ExternalTexture>(externalBuffer, *renderengine,
                                                         impl::ExternalTexture::Usage::READABLE);
         std::vector<const std::shared_ptr<ExternalTexture>> textures =
             {srcTexture, externalTexture};

         // Another external texture with a different pixel format triggers useIsOpaqueWorkaround.
         // It doesn't have to be f16, but it can't be the usual 8888.
         sp<GraphicBuffer> f16ExternalBuffer =
                 new GraphicBuffer(displayRect.width(), displayRect.height(), PIXEL_FORMAT_RGBA_FP16,
                                   1, usageExternal, "primeShaderCache_external_f16");
         // The F16 texture may not be usable on all devices, so check first that it was created.
         status_t error = f16ExternalBuffer->initCheck();
         if (!error) {
             const auto f16ExternalTexture =
                     std::make_shared<impl::ExternalTexture>(f16ExternalBuffer, *renderengine,
                                                             impl::ExternalTexture::Usage::READABLE);
             textures.push_back(f16ExternalTexture);
         }

         for (auto texture : textures) {
             drawImageLayers(renderengine, display, dstTexture, texture);
             // Draw layers for b/185569240.
             drawClippedLayers(renderengine, display, dstTexture, texture);
         }

         drawPIPImageLayer(renderengine, display, dstTexture, externalTexture);

         // draw one final layer synchronously to force GL submit
         LayerSettings layer{
                 .source = PixelSource{.solidColor = half3(0.f, 0.f, 0.f)},
         };
         auto layers = std::vector<LayerSettings>{layer};
         // call get() to make it synchronous
         renderengine
                 ->drawLayers(display, layers, dstTexture, kUseFrameBufferCache, base::unique_fd())
                 .get();

         const nsecs_t timeAfter = systemTime();
         const float compileTimeMs = static_cast<float>(timeAfter - timeBefore) / 1.0E6;
         const int shadersCompiled = renderengine->reportShadersCompiled();
         ALOGD("Shader cache generated %d shaders in %f ms\n", shadersCompiled, compileTimeMs);
     }
 }

 } // namespace android::renderengine::skia
	/*
	* Copyright 2021 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
	#include "Cache.h"
	#include "AutoBackendTexture.h"
	#include "SkiaRenderEngine.h"
	#include "android-base/unique_fd.h"
	#include "renderengine/DisplaySettings.h"
	#include "renderengine/LayerSettings.h"
	#include "renderengine/impl/ExternalTexture.h"
	#include "ui/GraphicBuffer.h"
	#include "ui/GraphicTypes.h"
	#include "ui/PixelFormat.h"
	#include "ui/Rect.h"
	#include "utils/Timers.h"

	namespace android::renderengine::skia {

	namespace {
	// Warming shader cache, not framebuffer cache.
	constexpr bool kUseFrameBufferCache = false;

	// clang-format off
	// Any non-identity matrix will do.
	const auto kScaleAndTranslate = mat4(0.7f, 0.f, 0.f, 0.f,
	0.f, 0.7f, 0.f, 0.f,
	0.f, 0.f, 1.f, 0.f,
	67.3f, 52.2f, 0.f, 1.f);
	const auto kScaleAsymmetric = mat4(0.8f, 0.f, 0.f, 0.f,
	0.f, 1.1f, 0.f, 0.f,
	0.f, 0.f, 1.f, 0.f,
	0.f, 0.f, 0.f, 1.f);
	const auto kFlip = mat4(1.1f, -0.1f, 0.f, 0.f,
	0.1f, 1.1f, 0.f, 0.f,
	0.f, 0.f, 1.f, 0.f,
	2.f, 2.f, 0.f, 1.f);
	// clang-format on
	// When setting layer.sourceDataspace, whether it matches the destination or not determines whether
	// a color correction effect is added to the shader.
	constexpr auto kDestDataSpace = ui::Dataspace::SRGB;
	constexpr auto kOtherDataSpace = ui::Dataspace::DISPLAY_P3;
	} // namespace

	static void drawShadowLayers(SkiaRenderEngine* renderengine, const DisplaySettings& display,
	const std::shared_ptr<ExternalTexture>& dstTexture) {
	// Somewhat arbitrary dimensions, but on screen and slightly shorter, based
	// on actual use.
	const Rect& displayRect = display.physicalDisplay;
	FloatRect rect(0, 0, displayRect.width(), displayRect.height());
	FloatRect smallerRect(20, 20, displayRect.width()-20, displayRect.height()-20);

	LayerSettings layer{
	.geometry =
	Geometry{
	.boundaries = rect,
	.roundedCornersCrop = rect,
	.roundedCornersRadius = 50.f,
	},
	// drawShadow ignores alpha
	.shadow =
	ShadowSettings{
	.boundaries = rect,
	.ambientColor = vec4(0, 0, 0, 0.00935997f),
	.spotColor = vec4(0, 0, 0, 0.0455841f),
	.lightPos = vec3(500.f, -1500.f, 1500.f),
	.lightRadius = 2500.0f,
	.length = 15.f,
	},
	// setting this is mandatory for shadows and blurs
	.skipContentDraw = true,
	.alpha = 1,
	};
	LayerSettings caster{
	.geometry =
	Geometry{
	.boundaries = smallerRect,
	.roundedCornersCrop = rect,
	.roundedCornersRadius = 50.f,
	},
	.source =
	PixelSource{
	.solidColor = half3(0.f, 0.f, 0.f),
	},
	.alpha = 1,
	};

	auto layers = std::vector<LayerSettings>{layer, caster};
	// Four combinations of settings are used (two transforms here, and drawShadowLayers is
	// called with two different destination data spaces) They're all rounded rect.
	// Three of these are cache misses that generate new shaders.
	// The first combination generates a short and simple shadow shader.
	// The second combination, flip transform, generates two shaders. The first appears to involve
	// gaussian_fp. The second is a long and general purpose shadow shader with a device space
	// transformation stage.
	// The third combination is a cache hit, nothing new.
	// The fourth combination, flip transform with a non-SRGB destination dataspace, is new.
	// It is unique in that nearly everything is done in the vertex shader, and that vertex shader
	// requires color correction. This is triggered differently from every other instance of color
	// correction. All other instances are triggered when src and dst dataspaces differ, while
	// this one is triggered by the destination being non-srgb. Apparently since the third
	// combination is a cache hit, this color correction is only added when the vertex shader is
	// doing something non-trivial.
	for (auto transform : {mat4(), kFlip}) {
	layer.geometry.positionTransform = transform;
	caster.geometry.positionTransform = transform;
	renderengine->drawLayers(display, layers, dstTexture, kUseFrameBufferCache,
	base::unique_fd());
	}
	}

	static void drawImageLayers(SkiaRenderEngine* renderengine, const DisplaySettings& display,
	const std::shared_ptr<ExternalTexture>& dstTexture,
	const std::shared_ptr<ExternalTexture>& srcTexture) {
	const Rect& displayRect = display.physicalDisplay;
	FloatRect rect(0, 0, displayRect.width(), displayRect.height());
	LayerSettings layer{
	.geometry =
	Geometry{
	// The position transform doesn't matter when the reduced shader mode
	// in in effect. A matrix transform stage is always included.
	.positionTransform = mat4(),
	.boundaries = rect,
	.roundedCornersCrop = rect,
	},
	.source = PixelSource{.buffer =
	Buffer{
	.buffer = srcTexture,
	.maxLuminanceNits = 1000.f,
	}},
	};

	auto layers = std::vector<LayerSettings>{layer};
	for (auto dataspace : {kDestDataSpace, kOtherDataSpace}) {
	layer.sourceDataspace = dataspace;
	// Cache shaders for both rects and round rects.
	// In reduced shader mode, all non-zero round rect radii get the same code path.
	for (float roundedCornersRadius : {0.0f, 50.0f}) {
	// roundedCornersCrop is always set, but the radius triggers the behavior
	layer.geometry.roundedCornersRadius = roundedCornersRadius;
	for (bool isOpaque : {true, false}) {
	layer.source.buffer.isOpaque = isOpaque;
	for (auto alpha : {half(.2f), half(1.0f)}) {
	layer.alpha = alpha;
	renderengine->drawLayers(display, layers, dstTexture, kUseFrameBufferCache,
	base::unique_fd());
	}
	}
	}
	}
	}

	static void drawSolidLayers(SkiaRenderEngine* renderengine, const DisplaySettings& display,
	const std::shared_ptr<ExternalTexture>& dstTexture) {
	const Rect& displayRect = display.physicalDisplay;
	FloatRect rect(0, 0, displayRect.width(), displayRect.height());
	LayerSettings layer{
	.geometry =
	Geometry{
	.boundaries = rect,
	},
	.source =
	PixelSource{
	.solidColor = half3(0.1f, 0.2f, 0.3f),
	},
	.alpha = 0.5,
	};

	auto layers = std::vector<LayerSettings>{layer};
	for (auto transform : {mat4(), kScaleAndTranslate}) {
	layer.geometry.positionTransform = transform;
	for (float roundedCornersRadius : {0.0f, 50.f}) {
	layer.geometry.roundedCornersRadius = roundedCornersRadius;
	renderengine->drawLayers(display, layers, dstTexture, kUseFrameBufferCache,
	base::unique_fd());
	}
	}
	}

	static void drawBlurLayers(SkiaRenderEngine* renderengine, const DisplaySettings& display,
	const std::shared_ptr<ExternalTexture>& dstTexture) {
	const Rect& displayRect = display.physicalDisplay;
	FloatRect rect(0, 0, displayRect.width(), displayRect.height());
	LayerSettings layer{
	.geometry =
	Geometry{
	.boundaries = rect,
	},
	.alpha = 1,
	// setting this is mandatory for shadows and blurs
	.skipContentDraw = true,
	};

	auto layers = std::vector<LayerSettings>{layer};
	// Different blur code is invoked for radii less and greater than 30 pixels
	for (int radius : {9, 60}) {
	layer.backgroundBlurRadius = radius;
	renderengine->drawLayers(display, layers, dstTexture, kUseFrameBufferCache,
	base::unique_fd());
	}
	}

	// The unique feature of these layers is that the boundary is slightly smaller than the rounded
	// rect crop, so the rounded edges intersect that boundary and require a different clipping method.
	// For buffers, this is done with a stage that computes coverage and it will differ for round and
	// elliptical corners.
	static void drawClippedLayers(SkiaRenderEngine* renderengine, const DisplaySettings& display,
	const std::shared_ptr<ExternalTexture>& dstTexture,
	const std::shared_ptr<ExternalTexture>& srcTexture) {
	const Rect& displayRect = display.physicalDisplay;
	FloatRect rect(0, 0, displayRect.width(), displayRect.height() - 20); // boundary is smaller

	PixelSource bufferSource{.buffer = Buffer{
	.buffer = srcTexture,
	.isOpaque = 0,
	.maxLuminanceNits = 1000.f,
	}};
	PixelSource bufferOpaque{.buffer = Buffer{
	.buffer = srcTexture,
	.isOpaque = 1,
	.maxLuminanceNits = 1000.f,
	}};
	PixelSource colorSource{.solidColor = half3(0.1f, 0.2f, 0.3f)};

	LayerSettings layer{
	.geometry =
	Geometry{
	.boundaries = rect,
	.roundedCornersRadius = 27, // larger than the 20 above.
	.roundedCornersCrop =
	FloatRect(0, 0, displayRect.width(), displayRect.height()),
	},
	};

	auto layers = std::vector<LayerSettings>{layer};
	for (auto pixelSource : {bufferSource, bufferOpaque, colorSource}) {
	layer.source = pixelSource;
	for (auto dataspace : {kDestDataSpace, kOtherDataSpace}) {
	layer.sourceDataspace = dataspace;
	// Produce a CircularRRect clip and an EllipticalRRect clip.
	for (auto transform : {kScaleAndTranslate, kScaleAsymmetric}) {
	layer.geometry.positionTransform = transform;
	for (float alpha : {0.5f, 1.f}) {
	layer.alpha = alpha,
	renderengine->drawLayers(display, layers, dstTexture, kUseFrameBufferCache,
	base::unique_fd());
	}
	}
	}
	}
	}

	static void drawPIPImageLayer(SkiaRenderEngine* renderengine, const DisplaySettings& display,
	const std::shared_ptr<ExternalTexture>& dstTexture,
	const std::shared_ptr<ExternalTexture>& srcTexture) {
	const Rect& displayRect = display.physicalDisplay;
	FloatRect rect(0, 0, displayRect.width(), displayRect.height());
	LayerSettings layer{
	.geometry =
	Geometry{
	// Note that this flip matrix only makes a difference when clipping,
	// which happens in this layer because the roundrect crop is just a bit
	// larger than the layer bounds.
	.positionTransform = kFlip,
	.boundaries = rect,
	.roundedCornersRadius = 94.2551,
	.roundedCornersCrop = FloatRect(
	-93.75, 0, displayRect.width() + 93.75, displayRect.height()),
	},
	.source = PixelSource{.buffer =
	Buffer{
	.buffer = srcTexture,
	.maxLuminanceNits = 1000.f,
	.isOpaque = 0,
	.usePremultipliedAlpha = 1,
	}},
	.sourceDataspace = kOtherDataSpace,
	.alpha = 1,

	};

	auto layers = std::vector<LayerSettings>{layer};
	renderengine->drawLayers(display, layers, dstTexture, kUseFrameBufferCache, base::unique_fd());
	}

	static void drawHolePunchLayer(SkiaRenderEngine* renderengine, const DisplaySettings& display,
	const std::shared_ptr<ExternalTexture>& dstTexture) {
	const Rect& displayRect = display.physicalDisplay;
	FloatRect rect(0, 0, displayRect.width(), displayRect.height());
	FloatRect small(0, 0, displayRect.width()-20, displayRect.height()+20);
	LayerSettings layer{
	.geometry =
	Geometry{
	.positionTransform = kScaleAndTranslate,
	// the boundaries have to be smaller than the rounded crop so that
	// clipRRect is used instead of drawRRect
	.boundaries = small,
	.roundedCornersRadius = 50.f,
	.roundedCornersCrop = rect,
	},
	.source = PixelSource{
	.solidColor = half3(0.f, 0.f, 0.f),
	},
	.sourceDataspace = kDestDataSpace,
	.alpha = 0,
	.disableBlending = true,

	};

	auto layers = std::vector<LayerSettings>{layer};
	renderengine->drawLayers(display, layers, dstTexture, kUseFrameBufferCache, base::unique_fd());
	}

	//
	// The collection of shaders cached here were found by using perfetto to record shader compiles
	// during actions that involve RenderEngine, logging the layer settings, and the shader code
	// and reproducing those settings here.
	//
	// It is helpful when debugging this to turn on
	// in SkGLRenderEngine.cpp:
	// kPrintLayerSettings = true
	// kFlushAfterEveryLayer = true
	// in external/skia/src/gpu/gl/builders/GrGLShaderStringBuilder.cpp
	// gPrintSKSL = true
	void Cache::primeShaderCache(SkiaRenderEngine* renderengine) {
	const int previousCount = renderengine->reportShadersCompiled();
	if (previousCount) {
	ALOGD("%d Shaders already compiled before Cache::primeShaderCache ran\n", previousCount);
	}

	// The loop is beneficial for debugging and should otherwise be optimized out by the compiler.
	// Adding additional bounds to the loop is useful for verifying that the size of the dst buffer
	// does not impact the shader compilation counts by triggering different behaviors in RE/Skia.
	for (SkSize bounds : {SkSize::Make(128, 128), /SkSize::Make(1080, 2340)/}) {
	const nsecs_t timeBefore = systemTime();
	// The dimensions should not matter, so long as we draw inside them.
	const Rect displayRect(0, 0, bounds.fWidth, bounds.fHeight);
	DisplaySettings display{
	.physicalDisplay = displayRect,
	.clip = displayRect,
	.maxLuminance = 500,
	.outputDataspace = kDestDataSpace,
	};
	DisplaySettings p3Display{
	.physicalDisplay = displayRect,
	.clip = displayRect,
	.maxLuminance = 500,
	.outputDataspace = kOtherDataSpace,
	};

	const int64_t usage = GRALLOC_USAGE_HW_RENDER \| GRALLOC_USAGE_HW_TEXTURE;

	sp<GraphicBuffer> dstBuffer =
	new GraphicBuffer(displayRect.width(), displayRect.height(), PIXEL_FORMAT_RGBA_8888,
	1, usage, "primeShaderCache_dst");

	const auto dstTexture =
	std::make_shared<impl::ExternalTexture>(dstBuffer, *renderengine,
	impl::ExternalTexture::Usage::WRITEABLE);
	// This buffer will be the source for the call to drawImageLayers. Draw
	// something to it as a placeholder for what an app draws. We should draw
	// something, but the details are not important. Make use of the shadow layer drawing step
	// to populate it.
	sp<GraphicBuffer> srcBuffer =
	new GraphicBuffer(displayRect.width(), displayRect.height(), PIXEL_FORMAT_RGBA_8888,
	1, usage, "drawImageLayer_src");

	const auto srcTexture = std::make_shared<
	impl::ExternalTexture>(srcBuffer, *renderengine,
	impl::ExternalTexture::Usage::READABLE \|
	impl::ExternalTexture::Usage::WRITEABLE);
	drawHolePunchLayer(renderengine, display, dstTexture);
	drawSolidLayers(renderengine, display, dstTexture);

	drawShadowLayers(renderengine, display, srcTexture);
	drawShadowLayers(renderengine, p3Display, srcTexture);

	if (renderengine->supportsBackgroundBlur()) {
	drawBlurLayers(renderengine, display, dstTexture);
	}

	// The majority of skia shaders needed by RenderEngine are related to sampling images.
	// These need to be generated with various source textures.
	// Make a list of applicable sources.
	// GRALLOC_USAGE_HW_TEXTURE should be the same as AHARDWAREBUFFER_USAGE_GPU_SAMPLED_IMAGE.
	const int64_t usageExternal = GRALLOC_USAGE_HW_TEXTURE;
	sp<GraphicBuffer> externalBuffer =
	new GraphicBuffer(displayRect.width(), displayRect.height(), PIXEL_FORMAT_RGBA_8888,
	1, usageExternal, "primeShaderCache_external");
	const auto externalTexture =
	std::make_shared<impl::ExternalTexture>(externalBuffer, *renderengine,
	impl::ExternalTexture::Usage::READABLE);
	std::vector<const std::shared_ptr<ExternalTexture>> textures =
	{srcTexture, externalTexture};

	// Another external texture with a different pixel format triggers useIsOpaqueWorkaround.
	// It doesn't have to be f16, but it can't be the usual 8888.
	sp<GraphicBuffer> f16ExternalBuffer =
	new GraphicBuffer(displayRect.width(), displayRect.height(), PIXEL_FORMAT_RGBA_FP16,
	1, usageExternal, "primeShaderCache_external_f16");
	// The F16 texture may not be usable on all devices, so check first that it was created.
	status_t error = f16ExternalBuffer->initCheck();
	if (!error) {
	const auto f16ExternalTexture =
	std::make_shared<impl::ExternalTexture>(f16ExternalBuffer, *renderengine,
	impl::ExternalTexture::Usage::READABLE);
	textures.push_back(f16ExternalTexture);
	}

	for (auto texture : textures) {
	drawImageLayers(renderengine, display, dstTexture, texture);
	// Draw layers for b/185569240.
	drawClippedLayers(renderengine, display, dstTexture, texture);
	}

	drawPIPImageLayer(renderengine, display, dstTexture, externalTexture);

	// draw one final layer synchronously to force GL submit
	LayerSettings layer{
	.source = PixelSource{.solidColor = half3(0.f, 0.f, 0.f)},
	};
	auto layers = std::vector<LayerSettings>{layer};
	// call get() to make it synchronous
	renderengine
	->drawLayers(display, layers, dstTexture, kUseFrameBufferCache, base::unique_fd())
	.get();

	const nsecs_t timeAfter = systemTime();
	const float compileTimeMs = static_cast<float>(timeAfter - timeBefore) / 1.0E6;
	const int shadersCompiled = renderengine->reportShadersCompiled();
	ALOGD("Shader cache generated %d shaders in %f ms\n", shadersCompiled, compileTimeMs);
	}
	}

	} // namespace android::renderengine::skia