RMatrixUtils Class Reference

Helpers for building the coordinate-space transformation matrices used during rendering. More...

#include <RMatrixUtils.h>

Static Public Member Functions
static SkMatrix	DstTransform (CZTransform transform, SkSize dstSize) noexcept
	Returns a matrix that applies the transform to RSurface::dst(), producing framebuffer pixel-space coordinates.
static SkMatrix	VirtualToNDC (CZTransform transform, SkRect viewport, SkRect dst, SkISize imageSize, bool flipY) noexcept
	Virtual -> RImage -> NDC coords.
static SkMatrix	VirtualToImage (CZTransform transform, SkRect viewport, SkRect dst) noexcept
	Virtual -> RImage coords.
static SkMatrix	VirtualToUV (SkRect dst, CZTransform srcTransform, SkScalar srcScale, SkRect srcRect, SkISize texSize) noexcept
	Virtual -> RImage -> UV coords.
static SkRect	SkImageSrcRect (const RDrawImageInfo &image) noexcept
	RDrawImageInfo src rect -> SkCanvas->drawImageRect src rect.
static SkMatrix	SkImageDstTransform (const RDrawImageInfo &image) noexcept
	Flips/rotates SkImage dst, the inverse should be applied to SkCanvas->drawImageRect dstRect.

Detailed Description

Helpers for building the coordinate-space transformation matrices used during rendering.

Provides static factories that produce SkMatrix / SkRect values mapping between the various coordinate spaces involved in drawing (virtual/viewport, image, NDC, UV and framebuffer pixel spaces).

Member Function Documentation

DstTransform()

static SkMatrix DstTransform ( CZTransform  transform, SkSize  dstSize  )

staticnoexcept

Returns a matrix that applies the transform to RSurface::dst(), producing framebuffer pixel-space coordinates.

VirtualToNDC()

static SkMatrix VirtualToNDC ( CZTransform  transform, SkRect  viewport, SkRect  dst, SkISize  imageSize, bool  flipY  )

staticnoexcept

Virtual -> RImage -> NDC coords.

VirtualToImage()

static SkMatrix VirtualToImage ( CZTransform  transform, SkRect  viewport, SkRect  dst  )

staticnoexcept

Virtual -> RImage coords.

VirtualToUV()

static SkMatrix VirtualToUV ( SkRect  dst, CZTransform  srcTransform, SkScalar  srcScale, SkRect  srcRect, SkISize  texSize  )

staticnoexcept

Virtual -> RImage -> UV coords.

SkImageSrcRect()

static SkRect SkImageSrcRect ( const RDrawImageInfo &  image )

staticnoexcept

RDrawImageInfo src rect -> SkCanvas->drawImageRect src rect.

SkImageDstTransform()

static SkMatrix SkImageDstTransform ( const RDrawImageInfo &  image )

staticnoexcept

Flips/rotates SkImage dst, the inverse should be applied to SkCanvas->drawImageRect dstRect.