mirror of
https://github.com/kovidgoyal/kitty.git
synced 2024-09-20 02:57:19 +03:00
402 lines
10 KiB
Go
402 lines
10 KiB
Go
// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
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package icat
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"image"
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"image/gif"
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"os"
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"os/exec"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"kitty/tools/tui/graphics"
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"kitty/tools/utils"
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"kitty/tools/utils/images"
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"kitty/tools/utils/shm"
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)
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var _ = fmt.Print
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var find_exe_lock sync.Once
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var magick_exe string = ""
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func find_magick_exe() {
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magick_exe = utils.Which("magick")
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}
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func run_magick(path string, cmd []string) ([]byte, error) {
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c := exec.Command(cmd[0], cmd[1:]...)
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output, err := c.Output()
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if err != nil {
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var exit_err *exec.ExitError
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if errors.As(err, &exit_err) {
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return nil, fmt.Errorf("Running the command: %s\nFailed with error:\n%s", strings.Join(cmd, " "), string(exit_err.Stderr))
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}
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return nil, fmt.Errorf("Could not find the program: %#v. Is ImageMagick installed and in your PATH?", cmd[0])
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}
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return output, nil
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}
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type IdentifyOutput struct {
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Fmt, Canvas, Transparency, Gap, Index, Size, Dpi, Dispose, Orientation string
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}
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type IdentifyRecord struct {
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FmtUppercase string
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Gap int
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Canvas struct{ Width, Height, Left, Top int }
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Width, Height int
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Dpi struct{ X, Y float64 }
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Index int
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Mode graphics.GRT_f
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NeedsBlend bool
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Disposal int
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DimensionsSwapped bool
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}
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func parse_identify_record(ans *IdentifyRecord, raw *IdentifyOutput) (err error) {
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ans.FmtUppercase = strings.ToUpper(raw.Fmt)
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if raw.Gap != "" {
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ans.Gap, err = strconv.Atoi(raw.Gap)
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if err != nil {
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return fmt.Errorf("Invalid gap value in identify output: %s", raw.Gap)
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}
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ans.Gap = utils.Max(0, ans.Gap)
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}
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area, pos, found := utils.Cut(raw.Canvas, "+")
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ok := false
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if found {
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w, h, found := utils.Cut(area, "x")
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if found {
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ans.Canvas.Width, err = strconv.Atoi(w)
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if err == nil {
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ans.Canvas.Height, err = strconv.Atoi(h)
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if err == nil {
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x, y, found := utils.Cut(pos, "+")
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if found {
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ans.Canvas.Left, err = strconv.Atoi(x)
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if err == nil {
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ans.Canvas.Top, err = strconv.Atoi(y)
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ok = true
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}
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}
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}
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}
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}
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}
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if !ok {
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return fmt.Errorf("Invalid canvas value in identify output: %s", raw.Canvas)
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}
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w, h, found := utils.Cut(raw.Size, "x")
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ok = false
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if found {
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ans.Width, err = strconv.Atoi(w)
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if err == nil {
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ans.Height, err = strconv.Atoi(h)
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ok = true
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}
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}
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if !ok {
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return fmt.Errorf("Invalid size value in identify output: %s", raw.Size)
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}
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x, y, found := utils.Cut(raw.Dpi, "x")
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ok = false
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if found {
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ans.Dpi.X, err = strconv.ParseFloat(x, 64)
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if err == nil {
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ans.Dpi.Y, err = strconv.ParseFloat(y, 64)
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ok = true
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}
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}
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if !ok {
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return fmt.Errorf("Invalid dpi value in identify output: %s", raw.Dpi)
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}
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ans.Index, err = strconv.Atoi(raw.Index)
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if err != nil {
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return fmt.Errorf("Invalid index value in identify output: %s", raw.Index)
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}
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q := strings.ToLower(raw.Transparency)
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if q == "blend" || q == "true" {
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ans.Mode = graphics.GRT_format_rgba
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} else {
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ans.Mode = graphics.GRT_format_rgb
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}
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ans.NeedsBlend = q == "blend"
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switch strings.ToLower(raw.Dispose) {
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case "undefined":
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ans.Disposal = 0
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case "none":
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ans.Disposal = gif.DisposalNone
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case "background":
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ans.Disposal = gif.DisposalBackground
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case "previous":
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ans.Disposal = gif.DisposalPrevious
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default:
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return fmt.Errorf("Invalid value for dispose: %s", raw.Dispose)
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}
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switch raw.Orientation {
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case "5", "6", "7", "8":
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ans.DimensionsSwapped = true
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}
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if ans.DimensionsSwapped {
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ans.Canvas.Width, ans.Canvas.Height = ans.Canvas.Height, ans.Canvas.Width
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ans.Width, ans.Height = ans.Height, ans.Width
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}
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return
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}
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func Identify(path string) (ans []IdentifyRecord, err error) {
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find_exe_lock.Do(find_magick_exe)
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cmd := []string{"identify"}
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if magick_exe != "" {
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cmd = []string{magick_exe, cmd[0]}
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}
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q := `{"fmt":"%m","canvas":"%g","transparency":"%A","gap":"%T","index":"%p","size":"%wx%h",` +
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`"dpi":"%xx%y","dispose":"%D","orientation":"%[EXIF:Orientation]"},`
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cmd = append(cmd, "-format", q, "--", path)
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output, err := run_magick(path, cmd)
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if err != nil {
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return nil, err
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}
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output = bytes.TrimRight(bytes.TrimSpace(output), ",")
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raw_json := make([]byte, 0, len(output)+2)
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raw_json = append(raw_json, '[')
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raw_json = append(raw_json, output...)
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raw_json = append(raw_json, ']')
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var records []IdentifyOutput
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err = json.Unmarshal(raw_json, &records)
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if err != nil {
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return nil, fmt.Errorf("The ImageMagick identify program returned malformed output, with error: %w", err)
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}
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ans = make([]IdentifyRecord, len(records))
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for i, rec := range records {
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err = parse_identify_record(&ans[i], &rec)
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if err != nil {
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return nil, err
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}
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}
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return ans, nil
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}
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type RenderOptions struct {
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RemoveAlpha *images.NRGBColor
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Flip, Flop bool
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ResizeTo image.Point
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OnlyFirstFrame bool
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}
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func make_temp_dir() (ans string, err error) {
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if shm.SHM_DIR != "" {
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ans, err = os.MkdirTemp(shm.SHM_DIR, shm_template)
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if err == nil {
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return
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}
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}
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return os.MkdirTemp("", shm_template)
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}
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func check_resize(frame *image_frame) error {
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// ImageMagick sometimes generates RGBA images smaller than the specified
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// size. See https://github.com/kovidgoyal/kitty/issues/276 for examples
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s, err := os.Stat(frame.filename)
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if err != nil {
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return err
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}
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sz := int(s.Size())
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bytes_per_pixel := 4
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if frame.transmission_format == graphics.GRT_format_rgb {
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bytes_per_pixel = 3
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}
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expected_size := bytes_per_pixel * frame.width * frame.height
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if sz < expected_size {
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missing := expected_size - sz
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if missing%(bytes_per_pixel*frame.width) != 0 {
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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)
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}
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frame.height -= missing / (bytes_per_pixel * frame.width)
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}
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return nil
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}
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func Render(path string, ro *RenderOptions, frames []IdentifyRecord) (ans []*image_frame, err error) {
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find_exe_lock.Do(find_magick_exe)
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cmd := []string{"convert"}
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if magick_exe != "" {
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cmd = []string{magick_exe, cmd[0]}
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}
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ans = make([]*image_frame, 0, len(frames))
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defer func() {
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if err != nil && ans != nil {
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for _, frame := range ans {
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if frame.filename_is_temporary {
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os.Remove(frame.filename)
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}
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}
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ans = nil
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}
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}()
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if ro.RemoveAlpha != nil {
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cmd = append(cmd, "-background", ro.RemoveAlpha.AsSharp(), "-alpha", "remove")
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} else {
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cmd = append(cmd, "-background", "none")
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}
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if ro.Flip {
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cmd = append(cmd, "-flip")
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}
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if ro.Flop {
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cmd = append(cmd, "-flop")
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}
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cpath := path
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if ro.OnlyFirstFrame {
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cpath += "[0]"
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}
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has_multiple_frames := len(frames) > 1
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get_multiple_frames := has_multiple_frames && !ro.OnlyFirstFrame
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cmd = append(cmd, "--", cpath, "-auto-orient")
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if ro.ResizeTo.X > 0 {
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rcmd := []string{"-resize", fmt.Sprintf("%dx%d!", ro.ResizeTo.X, ro.ResizeTo.Y)}
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if get_multiple_frames {
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cmd = append(cmd, "-coalesce")
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cmd = append(cmd, rcmd...)
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cmd = append(cmd, "-deconstruct")
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} else {
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cmd = append(cmd, rcmd...)
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}
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}
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cmd = append(cmd, "-depth", "8", "-set", "filename:f", "%w-%h-%g-%p")
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if get_multiple_frames {
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cmd = append(cmd, "+adjoin")
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}
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tdir, err := make_temp_dir()
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if err != nil {
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err = fmt.Errorf("Failed to create temporary directory to hold ImageMagick output with error: %w", err)
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return
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}
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defer os.RemoveAll(tdir)
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mode := "rgba"
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if frames[0].Mode == graphics.GRT_format_rgb {
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mode = "rgb"
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}
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cmd = append(cmd, filepath.Join(tdir, "im-%[filename:f]."+mode))
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_, err = run_magick(path, cmd)
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if err != nil {
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return
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}
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entries, err := os.ReadDir(tdir)
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if err != nil {
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err = fmt.Errorf("Failed to read temp dir used to store ImageMagick output with error: %w", err)
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return
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}
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base_dir := filepath.Dir(tdir)
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gaps := make([]int, len(frames))
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for i, frame := range frames {
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gaps[i] = frame.Gap
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}
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min_gap := calc_min_gap(gaps)
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for _, entry := range entries {
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fname := entry.Name()
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p, _, _ := utils.Cut(fname, ".")
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parts := strings.Split(p, "-")
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if len(parts) < 5 {
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continue
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}
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index, cerr := strconv.Atoi(parts[len(parts)-1])
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if cerr != nil || index < 0 || index >= len(frames) {
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continue
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}
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width, cerr := strconv.Atoi(parts[1])
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if cerr != nil {
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continue
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}
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height, cerr := strconv.Atoi(parts[2])
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if cerr != nil {
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continue
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}
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_, pos, found := utils.Cut(parts[3], "+")
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if !found {
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continue
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}
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px, py, found := utils.Cut(pos, "+")
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if !found {
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continue
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}
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x, cerr := strconv.Atoi(px)
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if cerr != nil {
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continue
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}
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y, cerr := strconv.Atoi(py)
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if cerr != nil {
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continue
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}
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identify_data := frames[index]
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df, cerr := os.CreateTemp(base_dir, graphics.TempTemplate+"."+mode)
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if cerr != nil {
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err = fmt.Errorf("Failed to create a temporary file in %s with error: %w", base_dir, cerr)
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return
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}
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err = os.Rename(filepath.Join(tdir, fname), df.Name())
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if err != nil {
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err = fmt.Errorf("Failed to rename a temporary file in %s with error: %w", tdir, err)
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return
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}
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df.Close()
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frame := image_frame{
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number: index + 1, width: width, height: height, left: x, top: y,
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transmission_format: identify_data.Mode, filename_is_temporary: true,
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filename: df.Name(),
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}
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frame.set_delay(identify_data.Gap, min_gap)
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err = check_resize(&frame)
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if err != nil {
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return
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}
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ans = append(ans, &frame)
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}
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if len(ans) < len(frames) {
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err = fmt.Errorf("Failed to render %d out of %d frames", len(frames)-len(ans), len(frames))
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return
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}
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ans = utils.Sort(ans, func(a, b *image_frame) bool { return a.number < b.number })
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anchor_frame := 1
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for i, frame := range ans {
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anchor_frame = frame.set_disposal(anchor_frame, byte(frames[i].Disposal))
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}
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return
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}
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func render_image_with_magick(imgd *image_data, src *opened_input) (err error) {
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err = src.PutOnFilesystem()
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if err != nil {
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return err
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}
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frames, err := Identify(src.FileSystemName())
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if err != nil {
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return err
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}
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imgd.format_uppercase = frames[0].FmtUppercase
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imgd.canvas_width, imgd.canvas_height = frames[0].Canvas.Width, frames[0].Canvas.Height
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set_basic_metadata(imgd)
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if !imgd.needs_conversion {
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make_output_from_input(imgd, src)
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return nil
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}
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ro := RenderOptions{RemoveAlpha: remove_alpha, Flip: flip, Flop: flop}
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if scale_image(imgd) {
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ro.ResizeTo.X, ro.ResizeTo.Y = imgd.canvas_width, imgd.canvas_height
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}
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imgd.frames, err = Render(src.FileSystemName(), &ro, frames)
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if err != nil {
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return err
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}
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return nil
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}
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