RPixelBufferRegion Struct Reference

Describes a region to be copied from/to a pixel buffer. More...

#include <RImage.h>

Static Public Member Functions
static constexpr UInt8 *	AddressAt (UInt8 *origin, SkIPoint offset, UInt32 bytesPerPixel, UInt32 stride) noexcept
	Computes the address of a pixel within a buffer.

Public Attributes
SkIPoint	offset
	Offset in pixels applied to each source rect before copying.
UInt32	stride
	Stride in bytes of the pixel buffer.
UInt8 *	pixels
	Pointer to the top-left corner of the pixel buffer.
SkRegion	region
	Set of rectangles to copy, relative to the top-left corner of the source buffer.
RFormat	format
	The DRM format of the 'pixels' parameter.

Detailed Description

Describes a region to be copied from/to a pixel buffer.

Member Function Documentation

AddressAt()

static constexpr UInt8 * AddressAt ( UInt8 *  origin, SkIPoint  offset, UInt32  bytesPerPixel, UInt32  stride  )

inlinestaticconstexprnoexcept

Computes the address of a pixel within a buffer.

Parameters

origin	Pointer to the top-left corner of the buffer.
offset	Pixel offset from the origin.
bytesPerPixel	Number of bytes per pixel.
stride	Number of bytes per row.

Returns

Pointer to the pixel at offset.

Member Data Documentation

offset

SkIPoint offset

Offset in pixels applied to each source rect before copying.

Note

The offset is only applied to the source.

For example:

• To copy src(10, 10, 100, 100) to dest(0, 0, 100, 100), set offset = (10, 10) and region = (0, 0, 100, 100).
• To copy src(0, 0, 100, 100) to dest(10, 10, 100, 100), set offset = (-10, -10) and region = (10, 10, 100, 100).

stride

UInt32 stride

Stride in bytes of the pixel buffer.

• If used in RImage::writePixels() it represents the stride of the source buffer.
• If used in RImage::readPixels() it represents the stride of the destination buffer.

pixels

UInt8* pixels

Pointer to the top-left corner of the pixel buffer.

• If used in RImage::writePixels() it represents the source buffer.
• If used in RImage::readPixels() it represents the destination buffer.

region

SkRegion region

Set of rectangles to copy, relative to the top-left corner of the source buffer.

format

RFormat format

The DRM format of the 'pixels' parameter.