libs/renderengine/skia/Cache.cpp

/*
 * 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 "ui/GraphicBuffer.h"
#include "ui/GraphicTypes.h"
#include "ui/PixelFormat.h"
#include "ui/Rect.h"
#include "utils/Timers.h"

namespace android::renderengine::skia {

static void drawShadowLayer(SkiaRenderEngine* renderengine, const DisplaySettings& display,
                            sp<GraphicBuffer> dstBuffer) {
    // Somewhat arbitrary dimensions, but on screen and slightly shorter, based
    // on actual use.
    FloatRect rect(0, 0, display.physicalDisplay.width(), display.physicalDisplay.height() - 30);
    LayerSettings layer{
            .geometry =
                    Geometry{
                            .boundaries = rect,
                            .roundedCornersCrop = rect,
                    },
            .shadow =
                    ShadowSettings{
                            .ambientColor = vec4(0, 0, 0, 0.00935997f),
                            .spotColor = vec4(0, 0, 0, 0.0455841f),
                            .lightPos = vec3(370.508f, -1527.03f, 1650.f),
                            .lightRadius = 2200.0f,
                            .length = 0.955342f,
                    },
    };

    auto layers = std::vector<const LayerSettings*>{&layer};
    // The identity matrix will generate the fast shaders, and the second matrix
    // (based on one seen while going from dialer to the home screen) will
    // generate the slower (more general case) version. If we also need a
    // slow version without color correction, we should use this matrix with
    // display.outputDataspace set to SRGB.
    for (const mat4 transform : { mat4(), mat4(0.728872f,   0.f,          0.f, 0.f,
                                               0.f,         0.727627f,    0.f, 0.f,
                                               0.f,         0.f,          1.f, 0.f,
                                               167.355743f, 1852.257812f, 0.f, 1.f) }) {
        layer.geometry.positionTransform = transform;
        renderengine->drawLayers(display, layers, dstBuffer, false /* useFrameBufferCache*/,
                                 base::unique_fd(), nullptr);
    }
}

static void drawImageLayers(SkiaRenderEngine* renderengine, const DisplaySettings& display,
                            sp<GraphicBuffer> dstBuffer, sp<GraphicBuffer> srcBuffer) {
    const Rect& displayRect = display.physicalDisplay;
    FloatRect rect(0, 0, displayRect.width(), displayRect.height());
    LayerSettings layer{
            .geometry =
                    Geometry{
                            .boundaries = rect,
                            // This matrix is based on actual data seen when opening the dialer.
                            // What seems to be important in matching the actual use cases are:
                            // - it is not identity
                            // - the layer will be drawn (not clipped out etc)
                            .positionTransform = mat4(.19f,     .0f, .0f,   .0f,
                                                      .0f,     .19f, .0f,   .0f,
                                                      .0f,      .0f, 1.f,   .0f,
                                                      169.f, 1527.f, .0f,   1.f),
                            .roundedCornersCrop = rect,
                    },
            .source = PixelSource{.buffer =
                                          Buffer{
                                                  .buffer = srcBuffer,
                                                  .maxMasteringLuminance = 1000.f,
                                                  .maxContentLuminance = 1000.f,
                                          }},
    };

    // Test both drawRect and drawRRect
    auto layers = std::vector<const LayerSettings*>{&layer};
    for (float roundedCornersRadius : {0.0f, 500.f}) {
        layer.geometry.roundedCornersRadius = roundedCornersRadius;
        // No need to check UNKNOWN, which is treated as SRGB.
        for (auto dataspace : {ui::Dataspace::SRGB, ui::Dataspace::DISPLAY_P3}) {
            layer.sourceDataspace = dataspace;
            for (bool isOpaque : {true, false}) {
                layer.source.buffer.isOpaque = isOpaque;
                for (auto alpha : {half(.23999f), half(1.0f)}) {
                    layer.alpha = alpha;
                    renderengine->drawLayers(display, layers, dstBuffer,
                                             false /* useFrameBufferCache*/, base::unique_fd(),
                                             nullptr);
                }
            }
        }
    }
}

void Cache::primeShaderCache(SkiaRenderEngine* renderengine) {
    const nsecs_t timeBefore = systemTime();
    // The dimensions should not matter, so long as we draw inside them.
    const Rect displayRect(0, 0, 1080, 2340);
    DisplaySettings display{
            .physicalDisplay = displayRect,
            .clip = displayRect,
            .maxLuminance = 500,
            .outputDataspace = ui::Dataspace::DISPLAY_P3,
    };

    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");
    // 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. We only need one version of
    // the shadow's SkSL, so draw it here, giving us both a placeholder image
    // and a chance to compile the shadow's SkSL.
    sp<GraphicBuffer> srcBuffer =
            new GraphicBuffer(displayRect.width(), displayRect.height(), PIXEL_FORMAT_RGBA_8888, 1,
                              usage, "drawImageLayer_src");
    drawShadowLayer(renderengine, display, srcBuffer);

    drawImageLayers(renderengine, display, dstBuffer, srcBuffer);
    const nsecs_t timeAfter = systemTime();
    const float compileTimeMs = static_cast<float>(timeAfter - timeBefore) / 1.0E6;
    ALOGD("shader cache generated in %f ms\n", compileTimeMs);
}

} // namespace android::renderengine::skia