impeller::testing::MetalScreenshoter Class Reference

Converts Pictures to MetalScreenshots with the playground backend. More...

#include <metal_screenshoter.h>

Public Member Functions
	MetalScreenshoter ()
std::unique_ptr< MetalScreenshot >	MakeScreenshot (AiksContext &aiks_context, const Picture &picture, const ISize &size={300, 300})
const PlaygroundImpl &	GetPlayground () const

Detailed Description

Converts Pictures to MetalScreenshots with the playground backend.

Definition at line 16 of file metal_screenshoter.h.

Constructor & Destructor Documentation

MetalScreenshoter()

impeller::testing::MetalScreenshoter::MetalScreenshoter

(

)

Definition at line 16 of file metal_screenshoter.mm.

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

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

Member Function Documentation

GetPlayground()

const PlaygroundImpl& impeller::testing::MetalScreenshoter::GetPlayground ( ) const

inline

Definition at line 25 of file metal_screenshoter.h.

{ return *playground_; }

MakeScreenshot()

std::unique_ptr< MetalScreenshot > impeller::testing::MetalScreenshoter::MakeScreenshot	(	AiksContext &	aiks_context,
		const Picture &	picture,
		const ISize &	size = {300, 300}
	)

Definition at line 22 of file metal_screenshoter.mm.

                       {
  Vector2 content_scale = playground_->GetContentScale();
  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();
 
  if (metal_texture.pixelFormat != MTLPixelFormatBGRA8Unorm) {
    return {};
  }
 
  CIImage* ciImage = [[CIImage alloc] initWithMTLTexture:metal_texture
                                                 options:@{}];
  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_screenshoter.h
• impeller/golden_tests/metal_screenshoter.mm