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// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
package icat
import (
"fmt"
"github.com/kovidgoyal/kitty/tools/tty"
"github.com/kovidgoyal/kitty/tools/tui/graphics"
"github.com/kovidgoyal/kitty/tools/utils"
"github.com/kovidgoyal/kitty/tools/utils/images"
"github.com/kovidgoyal/kitty/tools/utils/shm"
"image"
"image/gif"
"github.com/edwvee/exiffix"
"github.com/kovidgoyal/imaging"
)
var _ = fmt.Print
func resize_frame(imgd *image_data, img image.Image) (image.Image, image.Rectangle) {
b := img.Bounds()
left, top, width, height := b.Min.X, b.Min.Y, b.Dx(), b.Dy()
new_width := int(imgd.scaled_frac.x * float64(width))
new_height := int(imgd.scaled_frac.y * float64(height))
img = imaging.Resize(img, new_width, new_height, imaging.Lanczos)
newleft := int(imgd.scaled_frac.x * float64(left))
newtop := int(imgd.scaled_frac.y * float64(top))
return img, image.Rect(newleft, newtop, newleft+new_width, newtop+new_height)
}
const shm_template = "kitty-icat-*"
func add_frame(ctx *images.Context, imgd *image_data, img image.Image) *image_frame {
is_opaque := false
if imgd.format_uppercase == "JPEG" {
// special cased because EXIF orientation could have already changed this image to an NRGBA making IsOpaque() very slow
is_opaque = true
} else {
is_opaque = images.IsOpaque(img)
}
b := img.Bounds()
if imgd.scaled_frac.x != 0 {
img, b = resize_frame(imgd, img)
}
f := image_frame{width: b.Dx(), height: b.Dy(), number: len(imgd.frames) + 1, left: b.Min.X, top: b.Min.Y}
dest_rect := image.Rect(0, 0, f.width, f.height)
var final_img image.Image
bytes_per_pixel := 4
if is_opaque || remove_alpha != nil {
var rgb *images.NRGB
bytes_per_pixel = 3
m, err := shm.CreateTemp(shm_template, uint64(f.width*f.height*bytes_per_pixel))
if err != nil {
rgb = images.NewNRGB(dest_rect)
} else {
rgb = &images.NRGB{Pix: m.Slice(), Stride: bytes_per_pixel * f.width, Rect: dest_rect}
f.shm = m
}
f.transmission_format = graphics.GRT_format_rgb
f.in_memory_bytes = rgb.Pix
final_img = rgb
} else {
var rgba *image.NRGBA
m, err := shm.CreateTemp(shm_template, uint64(f.width*f.height*bytes_per_pixel))
if err != nil {
rgba = image.NewNRGBA(dest_rect)
} else {
rgba = &image.NRGBA{Pix: m.Slice(), Stride: bytes_per_pixel * f.width, Rect: dest_rect}
f.shm = m
}
f.transmission_format = graphics.GRT_format_rgba
f.in_memory_bytes = rgba.Pix
final_img = rgba
}
ctx.PasteCenter(final_img, img, remove_alpha)
imgd.frames = append(imgd.frames, &f)
if flip {
ctx.FlipPixelsV(bytes_per_pixel, f.width, f.height, f.in_memory_bytes)
if f.height < imgd.canvas_height {
f.top = (2*imgd.canvas_height - f.height - f.top) % imgd.canvas_height
}
}
if flop {
ctx.FlipPixelsH(bytes_per_pixel, f.width, f.height, f.in_memory_bytes)
if f.width < imgd.canvas_width {
f.left = (2*imgd.canvas_width - f.width - f.left) % imgd.canvas_width
}
}
return &f
}
func scale_image(imgd *image_data) bool {
if imgd.needs_scaling {
width, height := imgd.canvas_width, imgd.canvas_height
if imgd.canvas_width < imgd.available_width && opts.ScaleUp && place != nil {
r := float64(imgd.available_width) / float64(imgd.canvas_width)
imgd.canvas_width, imgd.canvas_height = imgd.available_width, int(r*float64(imgd.canvas_height))
}
neww, newh := images.FitImage(imgd.canvas_width, imgd.canvas_height, imgd.available_width, imgd.available_height)
imgd.needs_scaling = false
imgd.scaled_frac.x = float64(neww) / float64(width)
imgd.scaled_frac.y = float64(newh) / float64(height)
imgd.canvas_width = int(imgd.scaled_frac.x * float64(width))
imgd.canvas_height = int(imgd.scaled_frac.y * float64(height))
return true
}
return false
}
func load_one_frame_image(imgd *image_data, src *opened_input) (img image.Image, err error) {
img, _, err = exiffix.Decode(src.file)
src.Rewind()
if err != nil {
return
}
// reset the sizes as we read EXIF tags here which could have rotated the image
imgd.canvas_width = img.Bounds().Dx()
imgd.canvas_height = img.Bounds().Dy()
set_basic_metadata(imgd)
scale_image(imgd)
return
}
var debugprintln = tty.DebugPrintln
var _ = debugprintln
func (frame *image_frame) set_disposal(anchor_frame int, disposal byte) int {
anchor_frame, frame.compose_onto = images.SetGIFFrameDisposal(frame.number, anchor_frame, disposal)
return anchor_frame
}
func (frame *image_frame) set_delay(gap, min_gap int) {
frame.delay_ms = utils.Max(min_gap, gap) * 10
if frame.delay_ms == 0 {
frame.delay_ms = -1
}
}
func add_gif_frames(ctx *images.Context, imgd *image_data, gf *gif.GIF) error {
min_gap := images.CalcMinimumGIFGap(gf.Delay)
scale_image(imgd)
anchor_frame := 1
for i, paletted_img := range gf.Image {
frame := add_frame(ctx, imgd, paletted_img)
frame.set_delay(gf.Delay[i], min_gap)
anchor_frame = frame.set_disposal(anchor_frame, gf.Disposal[i])
}
return nil
}
func render_image_with_go(imgd *image_data, src *opened_input) (err error) {
ctx := images.Context{}
switch {
case imgd.format_uppercase == "GIF" && opts.Loop != 0:
gif_frames, err := gif.DecodeAll(src.file)
src.Rewind()
if err != nil {
return fmt.Errorf("Failed to decode GIF file with error: %w", err)
}
err = add_gif_frames(&ctx, imgd, gif_frames)
if err != nil {
return err
}
default:
img, err := load_one_frame_image(imgd, src)
if err != nil {
return err
}
add_frame(&ctx, imgd, img)
}
return nil
}
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