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fix: respect device screen DPI #49

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fix: respect device screen DPI #49

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7d577cc
fix: respect screen DPI
x1unix Feb 26, 2024
f8f6007
fix: return non-scaled size for GetScreen functions
x1unix Feb 26, 2024
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24 changes: 20 additions & 4 deletions raylib.js
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,9 @@ class RaylibJs {
#FONT_SCALE_MAGIC = 0.65;

#reset() {
this.height = 0;
this.width = 0;
this.dpi = window.devicePixelRatio || 1;
this.previous = undefined;
this.wasm = undefined;
this.ctx = undefined;
Expand Down Expand Up @@ -107,8 +110,21 @@ class RaylibJs {
}

InitWindow(width, height, title_ptr) {
this.ctx.canvas.width = width;
this.ctx.canvas.height = height;
// Adjust viewport size according to screen DPI for HiDPI screens.
// see: https://web.dev/articles/canvas-hidipi
const { canvas } = this.ctx;
canvas.height = height * this.dpi;
canvas.width = width * this.dpi;
canvas.style.height = `${height}px`;
canvas.style.width = `${width}px`;
this.ctx.scale(this.dpi, this.dpi);

// Store original size for GetScreenWidth and GetScreenHeight calls.
// Necessary as some platforms allow fractional scaling (e.g 1.3)
// and dividing canvas size by DPR can cause rounding issues.
this.height = height;
this.width = width;

const buffer = this.wasm.instance.exports.memory.buffer;
document.title = cstr_by_ptr(buffer, title_ptr);
}
Expand All @@ -123,11 +139,11 @@ class RaylibJs {
}

GetScreenWidth() {
return this.ctx.canvas.width;
return this.width;
}

GetScreenHeight() {
return this.ctx.canvas.height;
return this.height;
}

GetFrameTime() {
Expand Down