impeller::testing::MetalScreenshotter Class Reference

#include <metal_screenshotter.h>

Inheritance diagram for impeller::testing::MetalScreenshotter:

Public Member Functions
	MetalScreenshotter (bool enable_wide_gamut)
std::unique_ptr< Screenshot >	MakeScreenshot (AiksContext &aiks_context, const Picture &picture, const ISize &size={300, 300}, bool scale_content=true) 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 ( bool  enable_wide_gamut )

explicit

Definition at line 16 of file metal_screenshotter.mm.

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

References impeller::PlaygroundImpl::Create(), impeller::PlaygroundSwitches::enable_wide_gamut, and impeller::kMetal.

Member Function Documentation

GetPlayground()

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

inlineoverridevirtual

Implements impeller::testing::Screenshotter.

Definition at line 28 of file metal_screenshotter.h.

{ return *playground_; }

MakeScreenshot()

std::unique_ptr< Screenshot > impeller::testing::MetalScreenshotter::MakeScreenshot ( AiksContext &  aiks_context, const Picture &  picture, const ISize &  size = {300, 300}, bool  scale_content = true  )

overridevirtual

Implements impeller::testing::Screenshotter.

Definition at line 23 of file metal_screenshotter.mm.

                        {
  Vector2 content_scale =
      scale_content ? playground_->GetContentScale() : Vector2{1, 1};
  std::shared_ptr<Image> image = picture.ToImage(
      aiks_context,
      ISize(size.width * content_scale.x, size.height * content_scale.y));
  std::shared_ptr<Texture> texture = image->GetTexture();
  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<Context> context = playground_->GetContext();
  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:[ciImage extent]];
 
  return std::unique_ptr<MetalScreenshot>(new MetalScreenshot(cgImage));
}

References impeller::TSize< T >::height, impeller::Picture::ToImage(), impeller::TSize< T >::width, impeller::TPoint< T >::x, and impeller::TPoint< T >::y.

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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