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icat: allow specifying image ids

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This commit is contained in:
Kovid Goyal
2023-03-09 10:17:53 +05:30
parent a56f111f98
commit 88443ef8a5
3 changed files with 31 additions and 13 deletions
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8
tools/cmd/icat/main.go
View File

@@ -240,8 +240,16 @@ func main(cmd *cli.Command, o *Options, args []string) (rc int, err error) {
if passthrough_mode != no_passthrough {
use_unicode_placeholder = true
}
base_id := uint32(opts.ImageId)
for num_of_items > 0 {
imgd := <-output_channel
if base_id != 0 {
imgd.image_id = base_id
base_id++
if base_id == 0 {
base_id++
}
}
imgd.use_unicode_placeholder = use_unicode_placeholder
imgd.passthrough_mode = passthrough_mode
num_of_items--

28
tools/cmd/icat/transmit.go
View File

@@ -313,19 +313,21 @@ func transmit_image(imgd *image_data) {
if f == nil {
f = transmit_stream
}
if imgd.use_unicode_placeholder {
for imgd.image_id&0xFF000000 == 0 || imgd.image_id&0x00FFFF00 == 0 {
// Generate a 32-bit image id using rejection sampling such that the most
// significant byte and the two bytes in the middle are non-zero to avoid
// collisions with applications that cannot represent non-zero most
// significant bytes (which is represented by the third combining character)
// or two non-zero bytes in the middle (which requires 24-bit color mode).
imgd.image_id = next_random()
}
} else {
if len(imgd.frames) > 1 {
for imgd.image_number == 0 {
imgd.image_number = next_random()
if imgd.image_id == 0 {
if imgd.use_unicode_placeholder {
for imgd.image_id&0xFF000000 == 0 || imgd.image_id&0x00FFFF00 == 0 {
// Generate a 32-bit image id using rejection sampling such that the most
// significant byte and the two bytes in the middle are non-zero to avoid
// collisions with applications that cannot represent non-zero most
// significant bytes (which is represented by the third combining character)
// or two non-zero bytes in the middle (which requires 24-bit color mode).
imgd.image_id = next_random()
}
} else {
if len(imgd.frames) > 1 {
for imgd.image_number == 0 {
imgd.image_number = next_random()
}
}
}
}