Allow controlling "zoom" level, to proportionally increase image size

[asfaltboy]

Some images may look small, especially on screens with high DPI (e.g retina). So it would be cool to control the image size by allowing one to zoom in.

[maxbol]

+1 for this!

I did my own little solution for this, it more or less works, but with some unexpected behaviors. Give it a try!

local autocmd = vim.api.nvim_create_autocmd
local map = vim.keymap.set

autocmd("BufRead", {
  group = "image.nvim",
  callback = function(o)
    local bufnr = o.buf
    local images = image.get_images({ buffer = bufnr })
    if #images ~= 1 then
      return
    end

    local preview_image = images[1]

    map("n", "+", function()
      preview_image.image_width = preview_image.image_width * 1.25
      preview_image.image_height = preview_image.image_height * 1.25
      preview_image:render()
    end, {
      buffer = bufnr,
      desc = "Zoom in image",
    })

    map("n", "_", function()
      preview_image.image_width = preview_image.image_width / 1.25
      preview_image.image_height = preview_image.image_height / 1.25
      preview_image:render()
    end, {
      buffer = bufnr,
      desc = "Zoom out image",
    })
  end,
})

[3rd]

Ha that's cool, we'll add a global scaling option as well!