Automattic/node-canvas

Segmentation Fault in PutImageData

Open

#1972 aperta il 20 gen 2022

Vedi su GitHub
 (5 commenti) (2 reazioni) (0 assegnatari)JavaScript (1140 fork)batch import
BugHelp wanted

Metriche repository

Star
 (9524 star)
Metriche merge PR
 (Merge medio 47m) (6 PR mergiate in 30 g)

Descrizione

Issue or Feature

PID 14986 received SIGSEGV for address: 0x9bf00803 /home/pi/Discord-Bot/node_modules/segfault-handler/build/Release/segfault-handler.node(+0x25f4)[0xf72df5f4] /lib/arm-linux-gnueabihf/libc.so.6(__default_rt_sa_restorer+0x0)[0xf7b28db0] /home/pi/Discord-Bot/node_modules/canvas/build/Release/canvas.node(_ZN9Context2d12PutImageDataERKN3Nan20FunctionCallbackInfoIN2v85ValueEEE+0x684)[0xf4c331b4] /home/pi/Discord-Bot/node_modules/canvas/build/Release/canvas.node(+0x23db4)[0xf4c29db4]

Steps to Reproduce

const canvas = new Canvas.createCanvas();

    const ctx = canvas.getContext('2d');

    ctx.canvas.width = 1024;
    ctx.canvas.height = 576;

    const base = await Canvas.loadImage(avatarURL);

    var hRatio = canvas.width / base.width;
    var vRatio = canvas.height / base.height;
    var ratio = Math.min(hRatio, vRatio);
    var centerShift_x = (canvas.width - base.width * ratio) / 2;
    var centerShift_y = (canvas.height - base.height * ratio) / 2;

    ctx.drawImage(base, 0, 0, base.width, base.height, // source rectangle
      centerShift_x, centerShift_y, base.width * ratio - 10, base.height * ratio - 10); // destination rectangle

    var imgData = ctx.getImageData(0, 0, canvas.width, canvas.height);
    var pix = imgData.data;
    //convert the image into a silhouette
    for (var i = 0, n = pix.length; i < n; i += 4) {
      //set red to 0
      pix[i] = 0;
      //set green to 0
      pix[i + 1] = 0;
      //set blue to 0
      pix[i + 2] = 0;
      //retain the alpha value
      pix[i + 3] = pix[i + 3];
    }
    await ctx.putImageData(imgData, 0, 0);

canvas.toBuffer()

Your Environment

  • Version of node-canvas (output of npm list canvas or yarn list canvas): 2.9.0
  • Environment (e.g. node 4.2.0 on Mac OS X 10.8): Raspberry Pi OS , Debian bullseye

Guida contributor