impeller::NinePatchConverter Class Reference

#include <nine_patch_converter.h>

Public Member Functions
	NinePatchConverter ()
	~NinePatchConverter ()
void	DrawNinePatch (const std::shared_ptr< Texture > &image, Rect center, Rect dst, const SamplerDescriptor &sampler, Canvas *canvas, Paint *paint)

Detailed Description

Definition at line 17 of file nine_patch_converter.h.

Constructor & Destructor Documentation

NinePatchConverter()

impeller::NinePatchConverter::NinePatchConverter ( )

default

~NinePatchConverter()

impeller::NinePatchConverter::~NinePatchConverter ( )

default

Member Function Documentation

DrawNinePatch()

void impeller::NinePatchConverter::DrawNinePatch	(	const std::shared_ptr< Texture > &	image,
		Rect	center,
		Rect	dst,
		const SamplerDescriptor &	sampler,
		Canvas *	canvas,
		Paint *	paint
	)

Definition at line 60 of file nine_patch_converter.cc.

                                                     {
  if (dst.IsEmpty()) {
    return;
  }
  auto image_size = image->GetSize();
  auto hSlices = InitSlices(0, center.GetLeft(), center.GetRight(),
                            image_size.width, dst.GetLeft(), dst.GetRight());
  auto vSlices = InitSlices(0, center.GetTop(), center.GetBottom(),
                            image_size.height, dst.GetTop(), dst.GetBottom());
 
  for (size_t yi = 0; yi < vSlices.size(); yi += 4) {
    auto srcY0 = vSlices[yi];
    auto dstY0 = vSlices[yi + 1];
    auto srcY1 = vSlices[yi + 2];
    auto dstY1 = vSlices[yi + 3];
    for (size_t xi = 0; xi < hSlices.size(); xi += 4) {
      auto srcX0 = hSlices[xi];
      auto dstX0 = hSlices[xi + 1];
      auto srcX1 = hSlices[xi + 2];
      auto dstX1 = hSlices[xi + 3];
      // TODO(jonahwilliams): consider converting this into a single call to
      // DrawImageAtlas.
      canvas->DrawImageRect(image, Rect::MakeLTRB(srcX0, srcY0, srcX1, srcY1),
                            Rect::MakeLTRB(dstX0, dstY0, dstX1, dstY1), *paint,
                            sampler, SourceRectConstraint::kStrict);
    }
  }
}

References impeller::Canvas::DrawImageRect(), impeller::TRect< T >::GetBottom(), impeller::TRect< T >::GetLeft(), impeller::TRect< T >::GetRight(), impeller::TRect< T >::GetTop(), impeller::TRect< T >::IsEmpty(), impeller::kStrict, and impeller::TRect< Scalar >::MakeLTRB().

Referenced by impeller::DlDispatcherBase::drawImageNine().

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

• impeller/display_list/nine_patch_converter.h
• impeller/display_list/nine_patch_converter.cc