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content / test / data / gpu / webcodecs / convert-to-rgb.js [blame]
// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
'use strict';
function rgb2yuv(r, g, b) {
let y = r * .299000 + g * .587000 + b * .114000
let u = r * -.168736 + g * -.331264 + b * .500000 + 128
let v = r * .500000 + g * -.418688 + b * -.081312 + 128
y = Math.round(y);
u = Math.round(u);
v = Math.round(v);
return {
y, u, v
}
}
function makeI420_frames() {
const kYellow = {r: 0xFF, g: 0xFF, b: 0x00};
const kRed = {r: 0xFF, g: 0x00, b: 0x00};
const kBlue = {r: 0x00, g: 0x00, b: 0xFF};
const kGreen = {r: 0x00, g: 0xFF, b: 0x00};
const kPink = {r: 0xFF, g: 0x78, b: 0xFF};
const kMagenta = {r: 0xFF, g: 0x00, b: 0xFF};
const kBlack = {r: 0x00, g: 0x00, b: 0x00};
const kWhite = {r: 0xFF, g: 0xFF, b: 0xFF};
const smpte170m = {
matrix: 'smpte170m',
primaries: 'smpte170m',
transfer: 'smpte170m',
fullRange: false
};
const bt709 = {
matrix: 'bt709',
primaries: 'bt709',
transfer: 'bt709',
fullRange: false
};
const result = [];
const init = {format: 'I420', timestamp: 0, codedWidth: 4, codedHeight: 4};
const colors =
[kYellow, kRed, kBlue, kGreen, kMagenta, kBlack, kWhite, kPink];
const data = new Uint8Array(24);
for (let colorSpace of [null, smpte170m, bt709]) {
init.colorSpace = colorSpace;
result.push(new VideoFrame(data, init));
for (let color of colors) {
color = rgb2yuv(color.r, color.g, color.b);
data.fill(color.y, 0, 16);
data.fill(color.u, 16, 20);
data.fill(color.v, 20, 24);
result.push(new VideoFrame(data, init));
}
}
return result;
}
async function test_frame(frame, colorSpace) {
const width = frame.visibleRect.width;
const height = frame.visibleRect.height;
const frame_description = JSON.stringify({
format: frame.format,
width: width,
height: height,
codedHeight: frame.codedHeight,
codedWidth: frame.codedWidth,
displayHeight: frame.displayHeight,
displayWidth: frame.displayWidth,
matrix: frame.colorSpace?.matrix,
primaries: frame.colorSpace?.primaries,
transfer: frame.colorSpace?.transfer
});
TEST.log(`Test color: ${colorSpace} frame:${frame_description}`);
const cnv = new OffscreenCanvas(width, height);
const ctx =
cnv.getContext('2d', {colorSpace: colorSpace, willReadFrequently: true});
// Read VideoFrame pixels via copyTo()
let imageData = ctx.createImageData(width, height);
let copy_to_buf = imageData.data.buffer;
let layout = null;
try {
const options = {
rect: {x: 0, y: 0, width: width, height: height},
format: 'RGBA',
colorSpace: colorSpace
};
layout = await frame.copyTo(copy_to_buf, options);
} catch (e) {
TEST.reportFailure(`copyTo() failure: ${e}`);
return;
}
if (layout.length != 1) {
TEST.skip('Conversion to RGB is not supported by the browser');
return;
}
// Read VideoFrame pixels via drawImage()
ctx.drawImage(frame, 0, 0, width, height, 0, 0, width, height);
imageData = ctx.getImageData(0, 0, width, height, {colorSpace: colorSpace});
let get_image_buf = imageData.data.buffer;
// Compare!
const tolerance = 1;
for (let i = 0; i < copy_to_buf.byteLength; i += 4) {
compareColors(
new Uint8Array(copy_to_buf, i, 4), new Uint8Array(get_image_buf, i, 4),
tolerance, `Mismatch at offset ${i}`);
if (TEST.finished) {
break;
}
}
}
async function check_predefined_frames() {
// Test frames constructed from an array buffer.
// This should be a part of the WPT tests some day.
for (let frame of makeI420_frames()) {
await test_frame(frame, 'srgb');
await test_frame(frame, 'display-p3');
frame.close();
}
}
async function main(arg) {
let source_type = arg.source_type;
TEST.log('Starting test with arguments: ' + JSON.stringify(arg));
let source = await createFrameSource(source_type, FRAME_WIDTH, FRAME_HEIGHT);
if (!source) {
TEST.skip('Unsupported source: ' + source_type);
return;
}
let frame = await source.getNextFrame();
await test_frame(frame, 'srgb');
await test_frame(frame, 'display-p3');
frame.close();
await check_predefined_frames();
source.close();
TEST.log('Test completed');
}