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set scale when generating png

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Júlio César Batista 2023-04-11 14:38:44 -03:00
parent cbd1afeaef
commit 1b8122b0f9
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GPG key ID: 10C4B861BF314878
2 changed files with 8 additions and 5 deletions
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8
lib/png/generate_png.js
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@ -1,18 +1,18 @@
async (imgString) => { async ({imgString, scale}) => {
const tempImg = new Image(); const tempImg = new Image();
const loadImage = () => { const loadImage = () => {
return new Promise((resolve, reject) => { return new Promise((resolve, reject) => {
tempImg.onload = (event) => resolve(event.currentTarget); tempImg.onload = (event) => resolve(event.currentTarget);
tempImg.onerror = () => { tempImg.onerror = () => {
reject("error loading string as an image"); reject("error loading string as an image:\n" + imgString);
}; };
tempImg.src = imgString; tempImg.src = imgString;
}); });
}; };
const img = await loadImage(); const img = await loadImage();
const canvas = document.createElement("canvas"); const canvas = document.createElement("canvas");
canvas.width = img.width * 2; canvas.width = img.width * scale;
canvas.height = img.height * 2; canvas.height = img.height * scale;
const ctx = canvas.getContext("2d"); const ctx = canvas.getContext("2d");
if (!ctx) { if (!ctx) {
return new Error("could not get canvas context"); return new Error("could not get canvas context");

5
lib/png/png.go
View file

@ -95,7 +95,10 @@ func ConvertSVG(ms *xmain.State, page playwright.Page, svg []byte) ([]byte, erro
defer cancel() defer cancel()
encodedSVG := base64.StdEncoding.EncodeToString(svg) encodedSVG := base64.StdEncoding.EncodeToString(svg)
pngInterface, err := page.Evaluate(genPNGScript, "data:image/svg+xml;charset=utf-8;base64,"+encodedSVG) pngInterface, err := page.Evaluate(genPNGScript, map[string]interface{}{
"imgString": "data:image/svg+xml;charset=utf-8;base64," + encodedSVG,
"scale": int(SCALE),
})
if err != nil { if err != nil {
return nil, fmt.Errorf("failed to generate png: %w", err) return nil, fmt.Errorf("failed to generate png: %w", err)
} }