CODEWITHSUNDEEP
c++bitmapskia
Aurlito
Aurlito

Reputation: 21

Skia SkCanvas cannot be constructed with SkBitmap

I have a draw(SkCanvas* canvas) function.

In main() I write:

SkBitmap myBitmap;
myBitmap.allocN32Pixels(640, 480);

SkCanvas *myCanvas(&myBitmap);
draw(myCanvas);

But Visual Studio generates this error:

"a value of type "SkBitmap *" cannot be used to initialize an entity of type "SkCanvas*"

What am I doing wrong?

My draw() function clutters the post and is completely useless for this question otherwise I've posted it.

This is the construction for SkCanvas.

/** Construct a canvas with the specified bitmap to draw into.
        @param bitmap   Specifies a bitmap for the canvas to draw into. Its
                        structure are copied to the canvas.
    */
explicit SkCanvas(const SkBitmap& bitmap);

Upvotes: 0

Views: 622

Answers (1)

Yakk - Adam Nevraumont
Yakk - Adam Nevraumont

Reputation: 275800

SkCanvas *myCanvas(&myBitmap);

this is a pointer to a canvas. The pointer types of SkCanvas* and SkBitmap* are unrelated.

SkCanvas myCanvas(&myBitmap);

this is a value of type myCanvas, initialized with a pointer to bitmap. If SkCanvas has a ctor taking a SkBitmap*, this should work.

It does not. It does have:

explicit SkCanvas(const SkBitmap& bitmap);

so this means:

SkCanvas myCanvas(myBitmap);

You'll probably also need to change the draw call to this:

draw(&myCanvas);

assuming that works. As a guess, you also need a refresher on the difference between pointers and values.

Upvotes: 1

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