@lightningjs/renderer
Version:
Lightning 3 Renderer
67 lines • 2.56 kB
JavaScript
/*
* If not stated otherwise in this file or this component's LICENSE file the
* following copyright and licenses apply:
*
* Copyright 2023 Comcast Cable Communications Management, LLC.
*
* Licensed under the Apache License, Version 2.0 (the License);
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { assertTruthy } from '../../../utils.js';
import { WebGlCtxTexture } from './WebGlCtxTexture.js';
export class WebGlCtxSubTexture extends WebGlCtxTexture {
constructor(glw, memManager, textureSource) {
super(glw, memManager, textureSource);
}
async onLoadRequest() {
const props = this.textureSource.textureData;
assertTruthy(props, 'SubTexture must have texture data');
if (props.data instanceof Uint8Array) {
// its a 1x1 Color Texture
return { w: 1, h: 1 };
}
return this.extractDimensions(props.data);
}
/**
* Efficiently extracts width/height from polymorphic texture data
* Optimized for performance by using type guards and avoiding unnecessary property access
*/
extractDimensions(data) {
if (data === null) {
return { w: 0, h: 0 };
}
// Check for standard web API objects first (most common case)
// These use width/height properties: ImageBitmap, ImageData, HTMLImageElement
if (this.hasWidthHeight(data) === true) {
return { w: data.width, h: data.height };
}
// Check for internal objects that use w/h properties: SubTextureProps, CompressedData
if (this.hasWH(data) === true) {
return { w: data.w, h: data.h };
}
// Fallback
return { w: 0, h: 0 };
}
/**
* Type guard for objects with width/height properties
*/
hasWidthHeight(data) {
return typeof data.width === 'number' && typeof data.height === 'number';
}
/**
* Type guard for objects with w/h properties
*/
hasWH(data) {
return typeof data.w === 'number' && typeof data.h === 'number';
}
}
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