mpv.rc: update Windows icon

Based on the OSX bundle icon.

Makefile

@@ -391,7 +391,7 @@ version.h .version: version.sh
 
 core/version.c osdep/mpv-rc.o: version.h
 
-osdep/mpv-rc.o: osdep/mpv.exe.manifest
+osdep/mpv-rc.o: osdep/mpv.exe.manifest etc/mpv-icon.ico
 
 DOCS/man/en/mpv.1: DOCS/man/en/af.rst \
                    DOCS/man/en/ao.rst \

TOOLS/svg2ico.sh

@@ -0,0 +1,64 @@
+#!/bin/sh
+set -e
+
+if [ $# -ne 2 ]; then
+    echo >&2 "Usage: $0 input.svg output.ico"
+    exit 1
+fi
+
+# For smooth rendering on high-DPI displays, the standard three app icon sizes
+# (16x16, 32x32 and 48x48) have to be scaled to the four Windows DPI settings
+# as in the table below:
+
+#                   Small  Regular    Tiles
+#  96 DPI (100%)    16x16    32x32    48x48
+# 120 DPI (125%)    20x20    40x40    60x60
+# 144 DPI (150%)    24x24    48x48    72x72
+# 196 DPI (200%)    32x32    64x64    96x96
+
+# Also, there should also be an extra large 256x256 icon and some low colour
+# 8-bit and 4-bit variants, which are still used in Remote Desktop.
+
+# Note: Windows Vista has a bug in its icon scaling that makes no sense.
+# Instead of following the DPI setting, small icons are always a bit larger
+# than they should be at 22x22, 26x26 and 36x36 for 120, 144 and 196 DPI. This
+# script doesn't generate icons with those sizes, since computers with Vista
+# and a high-DPI display are probably fairly rare these days.
+
+temppng=".$(basename "$1" .svg)-temp.png"
+
+inkscape --without-gui --export-png="$temppng" --export-dpi=72 \
+         --export-background-opacity=0 --export-width=512 --export-height=512 \
+         "$1" >/dev/null 2>&1
+
+# Old versions of ImageMagick (like the one in Cygwin) use the wrong gamma when
+# exporting icon files. To fix, add -gamma 2.2 after the input file.
+
+convert png:"$temppng" -filter lanczos2 \
+        \( -clone 0 -resize  96x96  \) \
+        \( -clone 0 -resize  72x72  \) \
+        \( -clone 0 -resize  64x64  \) \
+        \( -clone 0 -resize  60x60  \) \
+        \( -clone 0 -resize  48x48  \) \
+        \( -clone 0 -resize  40x40  \) \
+        \( -clone 0 -resize  32x32  \) \
+        \( -clone 0 -resize  24x24  \) \
+        \( -clone 0 -resize  20x20  \) \
+        \( -clone 0 -resize  16x16  \) \
+        \( -clone 0 -resize 256x256 \) \
+        \( -clone 0 -resize  32x32  \( -clone 0 -alpha opaque -colors 255 \) \
+                                    \( -clone 0 -channel A -threshold 50% \) \
+               -delete 0 -compose CopyOpacity -composite -colors 256 \) \
+        \( -clone 0 -resize  16x16  \( -clone 0 -alpha opaque -colors 255 \) \
+                                    \( -clone 0 -channel A -threshold 50% \) \
+               -delete 0 -compose CopyOpacity -composite -colors 256 \) \
+        \( -clone 0 -resize  32x32  \( -clone 0 -alpha opaque -colors  15 \) \
+                                    \( -clone 0 -channel A -threshold 50% \) \
+               -delete 0 -compose CopyOpacity -composite -colors  16 \) \
+        \( -clone 0 -resize  16x16  \( -clone 0 -alpha opaque -colors  15 \) \
+                                    \( -clone 0 -channel A -threshold 50% \) \
+               -delete 0 -compose CopyOpacity -composite -colors  16 \) \
+        -delete 0 \
+        -define png:compression-level=9 -define png:include-chunk=none ico:"$2"
+
+rm "$temppng"

osdep/mpv.rc

@@ -49,7 +49,7 @@ FILETYPE VFT_APP
     }
 }
 
-IDI_ICON1 ICON DISCARDABLE  "etc/mplayer.ico"
+IDI_ICON1 ICON DISCARDABLE  "etc/mpv-icon.ico"
 
 // for some reason RT_MANIFEST does not work
 1 24 "mpv.exe.manifest"