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readResources.js
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readResources.js
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'use strict';
var Cesium = require('cesium');
var fsExtra = require('fs-extra');
var Jimp = require('jimp');
var path = require('path');
var Promise = require('bluebird');
var addPipelineExtras = require('./addPipelineExtras');
var dataUriToBuffer = require('./dataUriToBuffer');
var ForEach = require('./ForEach');
var getImageExtension = require('./getImageExtension');
var defined = Cesium.defined;
var defaultValue = Cesium.defaultValue;
var isDataUri = Cesium.isDataUri;
var RuntimeError = Cesium.RuntimeError;
module.exports = readResources;
/**
* Read data uris, buffer views, or files referenced by the glTF into buffers.
* The buffer data is placed into extras._pipeline.source for the corresponding object.
* This stage runs before updateVersion and handles both glTF 1.0 and glTF 2.0 assets.
*
* @param {Object} gltf A javascript object containing a glTF asset.
* @param {Object} [options] Object with the following properties:
* @param {Boolean} [options.secure=false] Prevent the converter from reading separate resources from outside of the <code>resourceDirectory</code>.
* @param {String} [options.resourceDirectory] The path to look in when reading separate files.
* @param {Boolean} [options.decodeImages=false] Whether images should be decoded with Jimp.
* @param {Boolean} [options.checkTransparency=false] Do a more exhaustive check for texture transparency by looking at the alpha channel of each pixel.
* @returns {Promise} A promise that resolves to the glTF asset when all resources are read.
*
* @private
*/
function readResources(gltf, options) {
addPipelineExtras(gltf);
options = defaultValue(options, {});
options.checkTransparency = defaultValue(options.checkTransparency, false);
options.decodeImages = defaultValue(options.decodeImages, false) || options.checkTransparency;
var bufferPromises = [];
var resourcePromises = [];
ForEach.bufferLegacy(gltf, function(buffer) {
bufferPromises.push(readBuffer(gltf, buffer, options));
});
// Buffers need to be read first because images and shader may resolve to bufferViews
return Promise.all(bufferPromises)
.then(function() {
ForEach.shaderLegacy(gltf, function (shader) {
resourcePromises.push(readShader(gltf, shader, options));
});
ForEach.imageLegacy(gltf, function (image) {
resourcePromises.push(readImage(gltf, image, options));
ForEach.compressedImage(image, function(compressedImage) {
resourcePromises.push(readImage(gltf, compressedImage, options));
});
});
return Promise.all(resourcePromises);
})
.then(function() {
return gltf;
});
}
function readBuffer(gltf, buffer, options) {
return readResource(gltf, buffer, options)
.then(function(data) {
buffer.extras._pipeline.source = data;
});
}
function readImage(gltf, image, options) {
return readResource(gltf, image, options)
.then(function(data) {
image.extras._pipeline.source = data;
image.extras._pipeline.transparent = false;
if (options.decodeImages) {
return generateJimpImage(image, options);
}
});
}
function readShader(gltf, shader, options) {
return readResource(gltf, shader, options)
.then(function(data) {
shader.extras._pipeline.source = data.toString();
});
}
function readResource(gltf, object, options) {
var uri = object.uri;
delete object.uri; // Don't hold onto the uri, its contents will be stored in extras._pipeline.source
// Source already exists if the gltf was converted from a glb
var source = object.extras._pipeline.source;
if (defined(source)) {
return Promise.resolve(source);
}
// Handle reading buffer view from 1.0 glb model
var extensions = object.extensions;
if (defined(extensions)) {
var khrBinaryGltf = extensions.KHR_binary_glTF;
if (defined(khrBinaryGltf)) {
return Promise.resolve(readBufferView(gltf, khrBinaryGltf.bufferView));
}
}
if (defined(object.bufferView)) {
return Promise.resolve(readBufferView(gltf, object.bufferView));
}
if (isDataUri(uri)) {
return Promise.resolve(dataUriToBuffer(uri));
}
return readFile(object, uri, options);
}
function readBufferView(gltf, bufferViewId) {
var bufferView = gltf.bufferViews[bufferViewId];
var buffer = gltf.buffers[bufferView.buffer];
var source = buffer.extras._pipeline.source;
return source.slice(bufferView.byteOffset, bufferView.byteOffset + bufferView.byteLength);
}
function readFile(object, uri, options) {
var resourceDirectory = options.resourceDirectory;
var relativePath;
var absolutePath;
if (path.isAbsolute(uri)) {
relativePath = path.basename(uri);
absolutePath = uri;
} else {
if (!defined(resourceDirectory)) {
return Promise.reject(new RuntimeError('glTF model references separate files but no resourceDirectory is supplied'));
}
relativePath = uri;
absolutePath = path.join(resourceDirectory, uri);
}
if (relativePath.indexOf('..') === 0) {
return Promise.reject(new RuntimeError(uri + ' is outside of the resource directory and the secure flag is true.'));
}
if (!defined(object.name)) {
var extension = path.extname(uri);
object.name = path.basename(uri, extension);
}
object.extras._pipeline.absolutePath = absolutePath;
object.extras._pipeline.relativePath = relativePath;
return fsExtra.readFile(absolutePath);
}
var supportedExtensions = /\.(jpg|jpeg|bmp|png)$/i;
function generateJimpImage(image, options) {
var pipelineExtras = image.extras._pipeline;
var extension = getImageExtension(pipelineExtras.source);
if (!supportedExtensions.test(extension)) {
return;
}
// Workaround since Jimp (via pngjs) throws error when reading 1x1 png: https://github.com/oliver-moran/jimp/issues/181
var buffer = pipelineExtras.source;
if (extension === '.png') {
var width = buffer.readUInt32BE(16);
var height = buffer.readUInt32BE(20);
if (width === 1 && height === 1) {
pipelineExtras.jimpImage = new Jimp(1, 1, 0xFFFFFFFF);
pipelineExtras.imageChanged = false;
pipelineExtras.transparent = false;
return;
}
}
return Jimp.read(pipelineExtras.source)
.then(function(jimpImage) {
pipelineExtras.jimpImage = jimpImage;
pipelineExtras.imageChanged = false;
pipelineExtras.transparent = options.checkTransparency ? isTransparent(jimpImage) : false;
});
}
function isTransparent(jimpImage) {
var width = jimpImage.bitmap.width;
var height = jimpImage.bitmap.height;
for (var x = 0; x < width; ++x) {
for (var y = 0; y < height; ++y) {
var color = jimpImage.getPixelColor(x, y);
color = color & 0x000000FF;
if (color < 255) {
return true;
}
}
}
return false;
}