SkAutoCanvasRestore Reference

Automatic Canvas Restore

Class SkAutoCanvasRestore

Stack helper class calls SkCanvas::restoreToCount when SkAutoCanvasRestore goes out of scope. Use this to guarantee that the canvas is restored to a known state.

Overview

Constructor

SkAutoCanvasRestore can be constructed or initialized by these functions, including C++ class constructors.

Member Function

SkAutoCanvasRestore member functions read and modify the structure properties.

SkAutoCanvasRestore

Preserves Canvas save count. Optionally saves Canvas Clip and Canvas Matrix.

Parameters

Return Value

utility to restore Canvas state on destructor

Example

See Also

SkCanvas::save SkCanvas::restore

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~SkAutoCanvasRestore

Restores Canvas to saved state. Destructor is called when container goes out of scope.

See Also

SkCanvas::save SkCanvas::restore

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restore

Restores Canvas to saved state immediately. Subsequent calls and ~SkAutoCanvasRestore have no effect.

Example

Example Output

saveCanvas: false  before restore: 2
saveCanvas: false  after restore: 2
saveCanvas: true  before restore: 2
saveCanvas: true  after restore: 2
saveCanvas: false  before restore: 2
saveCanvas: false  after restore: 1
saveCanvas: true  before restore: 2
saveCanvas: true  after restore: 1
final count: 1

See Also

SkCanvas::save SkCanvas::restore

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