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Fix single-tile export: scale tile instead of cropping in canvas stit… #29

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Merged
zeke merged 1 commit into from
Aug 25, 2025
Merged

Fix single-tile export: scale tile instead of cropping in canvas stit… #29

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26 changes: 13 additions & 13 deletions pages/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -249,7 +249,7 @@ export default function Home({ prediction, baseUrl }) {
}, 10);
};

const stitchImages = async (imageUrl, screenWidth, screenHeight) => {
const stitchImages = async (imageUrl, screenWidth, screenHeight, tileSize) => {
/**
* Given a url for an image (which comes from replicate),
* stitch it into a canvas and return the canvas so we can download it.
Expand All @@ -269,25 +269,25 @@ export default function Home({ prediction, baseUrl }) {
var img = new Image();
img.src = imageURL;

var x = 0;
var y = 0;

img.addEventListener("load", (e) => {
while (y < screenHeight) {
while (x < screenWidth) {
ctx.drawImage(img, x, y);
x += 512;
const srcW = img.naturalWidth || 512;
const srcH = img.naturalHeight || 512;
const drawW = tileSize || srcW;
const drawH = tileSize || srcH;

for (let y = 0; y < screenHeight; y += drawH) {
for (let x = 0; x < screenWidth; x += drawW) {
// Draw full source tile scaled to desired draw size
ctx.drawImage(img, 0, 0, srcW, srcH, x, y, drawW, drawH);
}
x = 0;
y += 512;
}
});

return myCanvas.toDataURL("image/png");
};

const download = async (image, width, height) => {
stitchImages(image, width, height);
const download = async (image, width, height, tileSize) => {
stitchImages(image, width, height, tileSize);

const idStr = id ? `(${id})` : "";
// I couldn't figure out the async/await version of this
Expand Down Expand Up @@ -851,7 +851,7 @@ export function Save({ open, setOpen, wallpaper, download }) {
<div className="mt-2">
<button
className="inline-flex items-center rounded-md border border-gray-300 bg-white px-3 py-2 text-sm font-medium leading-4 text-gray-700 shadow-sm hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:ring-offset-2"
onClick={() => download(wallpaper, 256, 256)}
onClick={() => download(wallpaper, 256, 256, 256)}
>
Download
</button>
Expand Down