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feat(canvas): update canvas performance by setting willReadFrequently to true in context creation for improved read operations

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Ivan 2026-04-22 22:10:14 -05:00
parent 9fe768bec1
commit 11be22f7b8
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2 changed files with 77 additions and 0 deletions
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26
patches/ol-mapbox-style@13.4.1.patch Normal file
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@ -0,0 +1,26 @@
diff --git a/src/util.js b/src/util.js
index 93d48b4488def00cfa1641341435ea76516d9741..727ad1b3e6e668a8b34c8e544613710184cc9cd1 100644
--- a/src/util.js
+++ b/src/util.js
@@ -329,7 +329,9 @@ export function drawIconHalo(
2 * haloWidth * spriteImageData.pixelRatio + spriteImageData.height,
];
const imageCanvas = createCanvas(imgSize[0], imgSize[1]);
- const imageContext = imageCanvas.getContext('2d');
+ const imageContext = imageCanvas.getContext('2d', {
+ willReadFrequently: true,
+ });
imageContext.drawImage(
spriteImage,
spriteImageData.x,
@@ -379,7 +381,9 @@ function smoothstep(min, max, value) {
*/
export function drawSDF(image, area, color) {
const imageCanvas = createCanvas(area.width, area.height);
- const imageContext = imageCanvas.getContext('2d');
+ const imageContext = imageCanvas.getContext('2d', {
+ willReadFrequently: true,
+ });
imageContext.drawImage(
image,
area.x,

51
patches/ol@10.9.0.patch Normal file
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@ -0,0 +1,51 @@
diff --git a/render/canvas/ExecutorGroup.js b/render/canvas/ExecutorGroup.js
index e791ac73b7ca585c3892b5f02841e86aa83f47ce..75eb7d56e49d46bbfdf17ac303cc0557c53bb527 100644
--- a/render/canvas/ExecutorGroup.js
+++ b/render/canvas/ExecutorGroup.js
@@ -48,30 +48,7 @@ let canvasReadsBenchmarked = false;
/** Determine if canvas read operations are faster with willReadFrequently set to true or false */
function benchmarkCanvasReads() {
- let bestResult = 0;
- /**
- * @param {boolean} willReadFrequently Will read frequently.
- * @return {number} Operation count.
- */
- const measure = (willReadFrequently) => {
- const context = createCanvasContext2D(1, 1, null, {willReadFrequently});
- let count = 0;
- const start = performance.now();
- for (; performance.now() - start < 50; ++count) {
- context.fillStyle = `rgba(255,0,${count % 256},1)`;
- context.fillRect(0, 0, 1, 1);
- context.getImageData(0, 0, 1, 1);
- }
- bestResult = count > bestResult ? count : bestResult;
- return count;
- };
-
- const measures = {
- [measure(true)]: true,
- [measure(false)]: false,
- [measure(undefined)]: undefined,
- };
- willReadFrequently = measures[bestResult];
+ willReadFrequently = true;
canvasReadsBenchmarked = true;
}
diff --git a/render/canvas/hitdetect.js b/render/canvas/hitdetect.js
index 7f161bd7e94abb1293a5e61d5d11c87996ec9949..465c18663ccf257e494de0473ab6848e67d6f8f2 100644
--- a/render/canvas/hitdetect.js
+++ b/render/canvas/hitdetect.js
@@ -46,7 +46,9 @@ export function createHitDetectionImageData(
const userExtent = projection ? toUserExtent(extent, projection) : extent;
const width = size[0] * HIT_DETECT_RESOLUTION;
const height = size[1] * HIT_DETECT_RESOLUTION;
- const context = createCanvasContext2D(width, height);
+ const context = createCanvasContext2D(width, height, undefined, {
+ willReadFrequently: true,
+ });
context.imageSmoothingEnabled = false;
const canvas = context.canvas;
const renderer = new CanvasImmediateRenderer(