What the difference between SkImage/SkPicture/SkCanvas/SkSurface?

[xin...@intel.com]

Any brief sample to tell the differences?

[xin...@intel.com]

add SkBitmap.

[Hal Canary]

Image:. A read-only source of pixels.  May refer to encoded data.

Surface: A destination for drawing, either CPU or GPU.

Bitmap: before Surface and Image, was a source and a destination for drawing. Image/Source allows for more optimizationa.

Canvas: the abstract drawing interface.  Can point at a Surface, a Picture recorder, or Document.

Picture: a sequence of drawing commands; i.e. a command buffer

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[Peter Verswyvelen]

Is SkBitmap guaranteed to use the CPU backend?

For server side software rendering, would it be better to use SkBitmap for both reading and writing, or a separate SkSurface with raster backend and making a snapshot to encode the image? Wouldn’t the latter consume twice the memory and be slower because of copying? Some of our bitmaps are 20K by 20k pixels, so that matters...

 

On Saturday, May 20, 2017 at 1:37:30 AM UTC+2, Hal Canary wrote:

Image:. A read-only source of pixels.  May refer to encoded data.

Surface: A destination for drawing, either CPU or GPU.

Bitmap: before Surface and Image, was a source and a destination for drawing. Image/Source allows for more optimizationa.

Canvas: the abstract drawing interface.  Can point at a Surface, a Picture recorder, or Document.

Picture: a sequence of drawing commands; i.e. a command buffer

On May 19, 2017 7:04 PM, <xin...@intel.com> wrote:

add SkBitmap.

On Saturday, May 20, 2017 at 7:03:59 AM UTC+8, xin...@intel.com wrote:

Any brief sample to tell the differences?

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[Mike Reed]

The snapshot is designed to not make a copy.

draw into the surface -> snapshot image --> encode from the image --> release the image --> draw some more into the surface

We only perform the copy if you try drawing into the surface while still holding onto the snapped image.

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[Hal Canary]

On Fri, Jan 10, 2020 at 6:19 AM Peter Verswyvelen <bug...@gmail.com> wrote:

Is SkBitmap guaranteed to use the CPU backend?

Yes.