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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// The spec for HTMLCanvasElement.getContext() defines the context
// creation attributes as type "any". In order to eliminate custom
// bindings for getContext(), we define a dictionary that contains the
// union of all of the context types' attributes. Note that it is not
// possible to use a union type for this purpose because two dictionary
// types are not distinguishable.
//
// Fortunately, there aren't any context creation attributes which are
// defined with different default values in different context
// specifications. (The "alpha" value, in particular, has a default
// value of true for both the Canvas2D and WebGL specifications.)
//
// The PermissiveDictionaryConversion extended attribute ignores
// non-object types (like 'true' and 'false') passed to getContext() for
// the attributes instead of raising TypeError, following the behavior
// of the previous custom binding.
//
// N.B.: Web IDL doesn't support multiple inheritance of dictionaries.
enum CanvasPixelFormat {
"uint8", // default
"10-10-10-2",
"12-12-12-12",
"float16",
};
enum CanvasPowerPreference {
"default",
"low-power",
"high-performance",
};
[PermissiveDictionaryConversion]
dictionary CanvasContextCreationAttributesModule {
// This is an experimental feature, but it is not hidden behind a flag in
// the bindings because origin trial bindings don't work in extensions.
// The trial's runtime flag is instead checked inside
// HTMLCanvasElement.getContext().
[RuntimeEnabled=SurfaceEmbeddingFeatures] boolean desynchronized = false;
// Canvas 2D attributes
boolean alpha = true; // Also used for WebGL.
[RuntimeEnabled=CanvasColorManagement] CanvasColorSpace colorSpace = "srgb";
[RuntimeEnabled=CanvasColorManagement] CanvasPixelFormat pixelFormat = "uint8";
// WebGL attributes
boolean depth = true;
boolean stencil = false;
boolean antialias = true;
boolean premultipliedAlpha = true;
boolean preserveDrawingBuffer = false;
CanvasPowerPreference powerPreference = "default";
boolean failIfMajorPerformanceCaveat = false;
[RuntimeEnabled=WebXR] boolean xrCompatible = false;
};
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