impeller::testing::MetalScreenshotter Class Reference

#include <metal_screenshotter.h>

Inheritance diagram for impeller::testing::MetalScreenshotter:

Public Member Functions
	MetalScreenshotter (const PlaygroundSwitches &switches)
std::unique_ptr< Screenshot >	MakeScreenshot (const AiksContext &aiks_context, const std::shared_ptr< Texture > texture) override
PlaygroundImpl &	GetPlayground () override
Public Member Functions inherited from impeller::testing::Screenshotter
virtual	~Screenshotter ()=default

Detailed Description

Converts Pictures and DisplayLists to MetalScreenshots with the playground backend.

Definition at line 18 of file metal_screenshotter.h.

Constructor & Destructor Documentation

MetalScreenshotter()

impeller::testing::MetalScreenshotter::MetalScreenshotter ( const PlaygroundSwitches &  switches )

explicit

Definition at line 17 of file metal_screenshotter.mm.

                                                                         {
  FML_CHECK(::glfwInit() == GLFW_TRUE);
  playground_ = PlaygroundImpl::Create(PlaygroundBackend::kMetal, switches);
}

References impeller::PlaygroundImpl::Create(), FML_CHECK, GLFW_TRUE, and impeller::kMetal.

Member Function Documentation

GetPlayground()

PlaygroundImpl & impeller::testing::MetalScreenshotter::GetPlayground ( )

inlineoverridevirtual

Implements impeller::testing::Screenshotter.

Definition at line 26 of file metal_screenshotter.h.

{ return *playground_; }

MakeScreenshot()

std::unique_ptr< Screenshot > impeller::testing::MetalScreenshotter::MakeScreenshot ( const AiksContext &  aiks_context, const std::shared_ptr< Texture >  texture  )

overridevirtual

Implements impeller::testing::Screenshotter.

Definition at line 22 of file metal_screenshotter.mm.

                                          {
  @autoreleasepool {
    std::shared_ptr<Context> context = aiks_context.GetContext();
    fml::AutoResetWaitableEvent latch;
    if (auto cmd_buffer = context->CreateCommandBuffer()) {
      if (context->GetCommandQueue()
              ->Submit({cmd_buffer},
                       [&latch](CommandBuffer::Status status) {
                         FML_CHECK(status == CommandBuffer::Status::kCompleted);
                         latch.Signal();
                       })
              .ok()) {
        latch.Wait();
      }
    }
 
    id<MTLTexture> metal_texture =
        std::static_pointer_cast<TextureMTL>(texture)->GetMTLTexture();
 
    CGColorSpaceRef color_space = CGColorSpaceCreateDeviceRGB();
    CIImage* ciImage = [[CIImage alloc]
        initWithMTLTexture:metal_texture
                   options:@{kCIImageColorSpace : (__bridge id)color_space}];
    CGColorSpaceRelease(color_space);
    FML_CHECK(ciImage);
 
    std::shared_ptr<ContextMTL> context_mtl =
        std::static_pointer_cast<ContextMTL>(context);
    CIContext* cicontext =
        [CIContext contextWithMTLDevice:context_mtl->GetMTLDevice()];
    FML_CHECK(context);
 
    CIImage* flipped = [ciImage
        imageByApplyingOrientation:kCGImagePropertyOrientationDownMirrored];
 
    CGImageRef cgImage = [cicontext createCGImage:flipped
                                         fromRect:[flipped extent]];
 
    // NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDeleteLeaks)
    return std::unique_ptr<MetalScreenshot>(new MetalScreenshot(cgImage));
  }
}

References FML_CHECK, impeller::AiksContext::GetContext(), id, texture, and fml::AutoResetWaitableEvent::Wait().

Referenced by flutter::testing::DlSurfaceInstanceImpeller::SnapshotToPixelData().

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The documentation for this class was generated from the following files:

• impeller/golden_tests/metal_screenshotter.h
• impeller/golden_tests/metal_screenshotter.mm