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More work on image preview rendering

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This commit is contained in:
Kovid Goyal
2025-10-08 22:00:12 +05:30
parent 811b4fa127
commit 49d8b1a9d0
7 changed files with 503 additions and 59 deletions
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62
tools/utils/images/loading.go
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@@ -175,13 +175,20 @@ type SerializableImageMetadata struct {
const SERIALIZE_VERSION = 1
func (self *ImageData) SerializeOnlyMetadata() SerializableImageMetadata {
f := make([]SerializableImageFrame, len(self.Frames))
for i, s := range self.Frames {
f[i] = s.Serialize()
}
return SerializableImageMetadata{Version: SERIALIZE_VERSION, Width: self.Width, Height: self.Height, Format_uppercase: self.Format_uppercase, Frames: f}
}
func (self *ImageData) Serialize() (SerializableImageMetadata, [][]byte) {
m := SerializableImageMetadata{Version: SERIALIZE_VERSION, Width: self.Width, Height: self.Height, Format_uppercase: self.Format_uppercase}
m := self.SerializeOnlyMetadata()
data := make([][]byte, len(self.Frames))
for i, f := range self.Frames {
m.Frames = append(m.Frames, f.Serialize())
data[i] = f.Data()
m.Frames[len(m.Frames)-1].Size = len(data[i])
m.Frames[i].Size = len(data[i])
}
return m, data
}
@@ -272,29 +279,7 @@ func MakeTempDir(template string) (ans string, err error) {
return os.MkdirTemp("", template)
}
func check_resize(frame *ImageFrame, filename string) error {
// ImageMagick sometimes generates RGBA images smaller than the specified
// size. See https://github.com/kovidgoyal/kitty/issues/276 for examples
s, err := os.Stat(filename)
if err != nil {
return err
}
sz := int(s.Size())
bytes_per_pixel := 4
if frame.Is_opaque {
bytes_per_pixel = 3
}
expected_size := bytes_per_pixel * frame.Width * frame.Height
if sz < expected_size {
missing := expected_size - sz
if missing%(bytes_per_pixel*frame.Width) != 0 {
return fmt.Errorf("ImageMagick failed to resize correctly. It generated %d < %d of data (w=%d h=%d bpp=%d)", sz, expected_size, frame.Width, frame.Height, bytes_per_pixel)
}
frame.Height -= missing / (bytes_per_pixel * frame.Width)
}
return nil
}
// Native {{{
func (frame *ImageFrame) set_delay(min_gap, delay int) {
frame.Delay_ms = int32(max(min_gap, delay) * 10)
if frame.Delay_ms == 0 {
@@ -344,11 +329,36 @@ func OpenNativeImageFromReader(f io.ReadSeeker) (ans *ImageData, err error) {
return
}
// }}}
// ImageMagick {{{
var MagickExe = sync.OnceValue(func() string {
return utils.FindExe("magick")
})
func check_resize(frame *ImageFrame, filename string) error {
// ImageMagick sometimes generates RGBA images smaller than the specified
// size. See https://github.com/kovidgoyal/kitty/issues/276 for examples
s, err := os.Stat(filename)
if err != nil {
return err
}
sz := int(s.Size())
bytes_per_pixel := 4
if frame.Is_opaque {
bytes_per_pixel = 3
}
expected_size := bytes_per_pixel * frame.Width * frame.Height
if sz < expected_size {
missing := expected_size - sz
if missing%(bytes_per_pixel*frame.Width) != 0 {
return fmt.Errorf("ImageMagick failed to resize correctly. It generated %d < %d of data (w=%d h=%d bpp=%d)", sz, expected_size, frame.Width, frame.Height, bytes_per_pixel)
}
frame.Height -= missing / (bytes_per_pixel * frame.Width)
}
return nil
}
func RunMagick(path string, cmd []string) ([]byte, error) {
if MagickExe() != "magick" {
cmd = append([]string{MagickExe()}, cmd...)