2 files changed, 254 insertions, 0 deletions

diff --git a/home-config/home-configuration.scm b/home-config/home-configuration.scm
index 8dc46b9..f9fb2fd 100644
--- a/home-config/home-configuration.scm
+++ b/home-config/home-configuration.scm
@@ -115,6 +115,7 @@
                     ("waybar" ,(local-file "waybar" #:recursive? #t))
                     ("alacritty" ,(local-file "alacritty" #:recursive? #t))
                     ("aerc" ,(local-file "aerc" #:recursive? #t))
+                    ("mpv" ,(local-file "mpv" #:recursive? #t))
                     ("home-manager" ,(local-file "nix-home-manager" #:recursive? #t)) ))
          (service home-files-service-type
                   `((".local/share/nvim/site/autoload/plug.vim" ,(local-file "nvim/plugin-manager/plug.vim"))
diff --git a/home-config/mpv/scripts/easycrop.lua b/home-config/mpv/scripts/easycrop.lua
new file mode 100644
index 0000000..b3a84a7
--- /dev/null
+++ b/home-config/mpv/scripts/easycrop.lua
@@ -0,0 +1,253 @@
+local msg = require('mp.msg')
+local assdraw = require('mp.assdraw')
+
+local script_name = "easycrop"
+
+-- Number of crop points currently chosen (0 to 2)
+local points = {}
+-- True if in cropping selection mode
+local cropping = false
+-- Original value of osc property
+local osc_prop = false
+
+-- Helper that converts two points to top-left and bottom-right
+local swizzle_points = function (p1, p2)
+    if p1.x > p2.x then p1.x, p2.x = p2.x, p1.x end
+    if p1.y > p2.y then p1.y, p2.y = p2.y, p1.y end
+end
+
+local clamp = function (val, min, max)
+    assert(min <= max)
+    if val < min then return min end
+    if val > max then return max end
+    return val
+end
+
+local video_space_from_screen_space = function (ssp)
+    -- Video native dimensions and screen size
+    local vid_w = mp.get_property("width")
+    local vid_h = mp.get_property("height")
+    local osd_w = mp.get_property("osd-width")
+    local osd_h = mp.get_property("osd-height")
+
+    -- Factor by which the video is scaled to fit the screen
+    local scale = math.min(osd_w/vid_w, osd_h/vid_h)
+
+    -- Size video takes up in screen
+    local vid_sw, vid_sh = scale*vid_w, scale*vid_h
+
+    -- Video offset within screen
+    local off_x = math.floor((osd_w - vid_sw)/2)
+    local off_y = math.floor((osd_h - vid_sh)/2)
+
+    local vsp = {}
+
+    -- Move the point to within the video
+    vsp.x = clamp(ssp.x, off_x, off_x + vid_sw)
+    vsp.y = clamp(ssp.y, off_y, off_y + vid_sh)
+
+    -- Convert screen-space to video-space
+    vsp.x = math.floor((vsp.x - off_x) / scale)
+    vsp.y = math.floor((vsp.y - off_y) / scale)
+
+    return vsp
+end
+
+local screen_space_from_video_space = function (vsp)
+    -- Video native dimensions and screen size
+    local vid_w = mp.get_property("width")
+    local vid_h = mp.get_property("height")
+    local osd_w = mp.get_property("osd-width")
+    local osd_h = mp.get_property("osd-height")
+
+    -- Factor by which the video is scaled to fit the screen
+    local scale = math.min(osd_w/vid_w, osd_h/vid_h)
+
+    -- Size video takes up in screen
+    local vid_sw, vid_sh = scale*vid_w, scale*vid_h
+
+    -- Video offset within screen
+    local off_x = math.floor((osd_w - vid_sw)/2)
+    local off_y = math.floor((osd_h - vid_sh)/2)
+
+    local ssp = {}
+    ssp.x = vsp.x * scale + off_x
+    ssp.y = vsp.y * scale + off_y
+    return ssp
+end
+
+-- Wrapper that converts RRGGBB / RRGGBBAA to ASS format
+local ass_set_color = function (idx, color)
+    assert(color:len() == 8 or color:len() == 6)
+    local ass = ""
+
+    -- Set alpha value (if present)
+    if color:len() == 8 then
+        local alpha = 0xff - tonumber(color:sub(7, 8), 16)
+        ass = ass .. string.format("\\%da&H%X&", idx, alpha)
+    end
+
+    -- Swizzle RGB to BGR and build ASS string
+    color = color:sub(5, 6) .. color:sub(3, 4) .. color:sub(1, 2)
+    return "{" .. ass .. string.format("\\%dc&H%s&", idx, color) .. "}"
+end
+
+local draw_rect = function (p1, p2)
+    local osd_w, osd_h = mp.get_property("osd-width"), mp.get_property("osd-height")
+
+    ass = assdraw.ass_new()
+
+    -- Draw overlay over surrounding unselected region
+
+    ass:draw_start()
+    ass:pos(0, 0)
+
+    ass:append(ass_set_color(1, "000000aa"))
+    ass:append(ass_set_color(3, "00000000"))
+
+    local l = math.min(p1.x, p2.x)
+    local r = math.max(p1.x, p2.x)
+    local u = math.min(p1.y, p2.y)
+    local d = math.max(p1.y, p2.y)
+
+    ass:rect_cw(0, 0, l, osd_h)
+    ass:rect_cw(r, 0, osd_w, osd_h)
+    ass:rect_cw(l, 0, r, u)
+    ass:rect_cw(l, d, r, osd_h)
+
+    ass:draw_stop()
+
+    -- Draw border around selected region
+
+    ass:new_event()
+    ass:draw_start()
+    ass:pos(0, 0)
+
+    ass:append(ass_set_color(1, "00000000"))
+    ass:append(ass_set_color(3, "000000ff"))
+    ass:append("{\\bord2}")
+
+    ass:rect_cw(p1.x, p1.y, p2.x, p2.y)
+
+    ass:draw_stop()
+
+    mp.set_osd_ass(osd_w, osd_h, ass.text)
+end
+
+local draw_fill = function ()
+    local osd_w, osd_h = mp.get_property("osd-width"), mp.get_property("osd-height")
+
+    ass = assdraw.ass_new()
+    ass:draw_start()
+    ass:pos(0, 0)
+
+    ass:append(ass_set_color(1, "000000aa"))
+    ass:append(ass_set_color(3, "00000000"))
+    ass:rect_cw(0, 0, osd_w, osd_h)
+
+    ass:draw_stop()
+    mp.set_osd_ass(osd_w, osd_h, ass.text)
+end
+
+local draw_clear = function ()
+    local osd_w, osd_h = mp.get_property("osd-width"), mp.get_property("osd-height")
+    mp.set_osd_ass(osd_w, osd_h, "")
+end
+
+local draw_cropper = function ()
+    if #points == 1 then
+        local p1 = screen_space_from_video_space(points[1])
+        local p2 = {}
+        p2.x, p2.y = mp.get_mouse_pos()
+        draw_rect(p1, p2)
+    end
+end
+
+local uncrop = function ()
+    mp.command("no-osd vf del @" .. script_name .. ":crop")
+end
+
+local crop = function(p1, p2)
+    swizzle_points(p1, p2)
+
+    local w = p2.x - p1.x
+    local h = p2.y - p1.y
+    local ok, err = mp.command(string.format(
+        "no-osd vf add @%s:crop=%s:%s:%s:%s", script_name, w, h, p1.x, p1.y))
+
+    if not ok then
+        mp.osd_message("Cropping failed")
+        points = {}
+    end
+end
+
+local easycrop_stop = function ()
+    mp.set_property("osc", osc_prop)
+    cropping = false
+    mp.remove_key_binding("easycrop_mouse_btn0")
+    draw_clear()
+end
+
+local mouse_btn0_cb = function ()
+    if not cropping then
+        return
+    end
+
+    local mx, my = mp.get_mouse_pos()
+    table.insert(points, video_space_from_screen_space({ x = mx, y = my }))
+
+    if #points == 2 then
+        crop(points[1], points[2])
+        easycrop_stop()
+    end
+end
+
+local easycrop_start = function ()
+    -- Cropping requires swdec or hwdec with copy-back
+    local hwdec = mp.get_property("hwdec-current")
+    if hwdec == nil then
+        return mp.msg.error("Cannot determine current hardware decoder mode")
+    end
+    -- Check whitelist of ok values
+    local valid_hwdec = {
+       ["no"] = true, -- software decoding
+       -- Taken from mpv manual
+       ["videotoolbox-co"] = true,
+       ["vaapi-copy"] = true,
+       ["dxva2-copy"] = true,
+       ["d3d11va-copy"] = true,
+       ["mediacodec"] = true
+    }
+    if not valid_hwdec[hwdec] then
+        return mp.osd_message("Cropping requires swdec or hwdec with copy-back (see mpv manual)")
+    end
+
+    -- Just clear the current crop and return, if there is one
+    if #points ~= 0 then
+        uncrop()
+        points = {}
+        return
+    end
+
+    -- Hide OSC
+    osc_prop = mp.get_property("osc")
+    mp.set_property("osc", "no")
+
+    cropping = true
+    mp.add_forced_key_binding("mouse_btn0", "easycrop_mouse_btn0", mouse_btn0_cb)
+    draw_fill()
+end
+
+local easycrop_activate = function ()
+    if cropping then
+        easycrop_stop()
+    else
+        easycrop_start()
+    end
+end
+
+mp.add_key_binding("mouse_move", draw_cropper)
+mp.observe_property("osd-width", "native", draw_cropper)
+mp.observe_property("osd-height", "native", draw_cropper)
+
+mp.add_key_binding("c", "easy_crop", easycrop_activate)