These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.63 s (backtrack: 0/20).

[ebuild  N     ] media-libs/giflib-6.1.3:0/7::gentoo  USE="-doc -static-libs" 460 KiB
[ebuild  N     ] dev-util/vulkan-headers-1.4.363.0::gentoo  USE="-test" 3337 KiB
[ebuild     U  ] dev-util/spirv-headers-1.4.363.0::gentoo [1.4.341.0::gentoo] 581 KiB
[ebuild     U  ] dev-util/spirv-tools-1.4.363.0::gentoo [1.4.341.0::gentoo] USE="-test" 3474 KiB
[ebuild  N     ] media-libs/libwebp-1.6.0:0/7::gentoo  USE="gif jpeg opengl png tiff -static-libs -swap-16bit-csp" CPU_FLAGS_X86="avx2 sse2 sse4_1" 4196 KiB
[ebuild  N     ] media-libs/vulkan-loader-1.4.363.0::gentoo  USE="X -wayland" 1823 KiB
[ebuild  N     ] dev-util/glslang-1.4.363.0:0/16.6::gentoo  4528 KiB
[ebuild  N     ] dev-libs/ncnn-20250503:0/20250503::gentoo  USE="openmp vulkan -tools" 12892 KiB
[ebuild  N     ] media-gfx/waifu2x-ncnn-vulkan-20250504::gentoo  33279 KiB

Total: 9 packages (2 upgrades, 7 new), Size of downloads: 64565 KiB