Merge "Trigger external shader sampling wihout AHardwareBuffer" into sc-dev

#include "ui/Rect.h"

#include "utils/Timers.h"

#include <android/hardware_buffer.h>

namespace android::renderengine::skia {

namespace {

    }

}

namespace {

struct AHardwareBuffer_deleter {

    void operator()(AHardwareBuffer* ahb) const { AHardwareBuffer_release(ahb); }

};

std::unique_ptr<AHardwareBuffer, AHardwareBuffer_deleter> makeAHardwareBuffer() {

    AHardwareBuffer* buffer = nullptr;

    int w = 32;

    int h = 32;

    AHardwareBuffer_Desc hwbDesc;

    hwbDesc.width = w;

    hwbDesc.height = h;

    hwbDesc.layers = 1;

    hwbDesc.usage = AHARDWAREBUFFER_USAGE_CPU_READ_NEVER | AHARDWAREBUFFER_USAGE_CPU_WRITE_NEVER |

            AHARDWAREBUFFER_USAGE_GPU_SAMPLED_IMAGE;

    hwbDesc.format = AHARDWAREBUFFER_FORMAT_R8G8B8A8_UNORM;

    // The following three are not used in the allocate

    hwbDesc.stride = 0;

    hwbDesc.rfu0 = 0;

    hwbDesc.rfu1 = 0;

    if (int error = AHardwareBuffer_allocate(&hwbDesc, &buffer)) {

        ALOGE("Failed to allocated hardware buffer, error: %d", error);

        if (buffer) {

            AHardwareBuffer_release(buffer);

        }

        return nullptr;

    }

    return std::unique_ptr<AHardwareBuffer, AHardwareBuffer_deleter>(buffer);

}

} // namespace

//

// 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

    // The majority of shaders are related to sampling images.

    drawImageLayers(renderengine, display, dstBuffer, srcBuffer);

    // Draw image layers again sampling from an AHardwareBuffer if it is possible to create one.

    if (auto ahb = makeAHardwareBuffer()) {

        sp<GraphicBuffer> externalBuffer = GraphicBuffer::fromAHardwareBuffer(ahb.get());

    // 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");

    // TODO(b/184665179) doubles number of image shader compilations, but only somewhere

    // between 6 and 8 will occur in real uses.

    drawImageLayers(renderengine, display, dstBuffer, externalBuffer);

    renderengine->unbindExternalTextureBuffer(externalBuffer->getId());

    }

    renderengine->unbindExternalTextureBuffer(srcBuffer->getId());