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Export sk_canvas_save_layer_rec to expose SkCanvas::SaveLayerRec functionality #130

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@ahmed605 ahmed605 commented Jul 30, 2024

Description of Change

Export sk_canvas_save_layer_rec to expose SkCanvas::SaveLayerRec functionality

SkiaSharp Issue

Related to mono/SkiaSharp#2773

API Changes

Added:

  • int sk_canvas_save_layer_rec(sk_canvas_t* ccanvas, const sk_rect_t* cbounds, const sk_paint_t* cpaint, const sk_imagefilter_t* cfilter, uint32_t flags)

Behavioral Changes

None.

Required SkiaSharp PR

Requires mono/SkiaSharp#2962

PR Checklist

  • Rebased on top of skiasharp at time of PR
  • Changes adhere to coding standard
  • Updated documentation

@ahmed605 ahmed605 marked this pull request as ready for review August 1, 2024 13:49
@@ -113,6 +113,10 @@ int sk_canvas_save_layer(sk_canvas_t* ccanvas, const sk_rect_t* crect, const sk_
return AsCanvas(ccanvas)->saveLayer(AsRect(crect), AsPaint(cpaint));
}

int sk_canvas_save_layer_rec(sk_canvas_t* ccanvas, const sk_rect_t* cbounds, const sk_paint_t* cpaint, const sk_imagefilter_t* cfilter, uint32_t flags) {
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@mattleibow mattleibow Aug 20, 2024

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Can the enum also live in the C world and then the generator can find it and do the work. This also helps because you also need to update the src/c/sk_enums.cpp to do static checking. Enums go into include/c/sk_types.h

Many times, the C++ api inserts a new enum or changes the order and thus we have to catch this.

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The C++ API doesn't actually use an enum but a uint32_t typedef, that's why I did it this way

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I see what you mean, but I still think we can make the C API more sensible and also get the benefit of static value checking as I know the enum values do change between releases. For example, they have re-ordered/inserted values in the SkColorType enum several times already breaking the whole system because .NET does not work the same way as headers.

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@mattleibow mattleibow Aug 20, 2024

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Also, since the enum is part of the SkCanvas type, to avoid conflicts when they inevatably add a different save layer rec, the name should be sk_canvas_savelayerrec_flags_t.

I see in later versions of skia there are some other options available in the rec, such as filters and colorspace: https://github.com/google/skia/blob/main/include/core/SkCanvas.h#L684

So I think to avoid future confusion, the filter arg name should maybe be backdrop.

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2 participants