mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2025-10-30 17:12:25 -05:00
[bugfix] Fix thumbnails not taking exif rotation into account (#746)
* use disintegration/imaging instead of nfnt/resize * update tests * use disintegration lib for thumbing (if necessary)
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tobi
GitHub
parent
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commit
91c8d5d20d
47 changed files with 6984 additions and 2163 deletions
285
vendor/github.com/disintegration/imaging/scanner.go
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285
vendor/github.com/disintegration/imaging/scanner.go
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package imaging
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import (
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"image"
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"image/color"
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)
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type scanner struct {
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image image.Image
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w, h int
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palette []color.NRGBA
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}
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func newScanner(img image.Image) *scanner {
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s := &scanner{
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image: img,
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w: img.Bounds().Dx(),
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h: img.Bounds().Dy(),
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}
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if img, ok := img.(*image.Paletted); ok {
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s.palette = make([]color.NRGBA, len(img.Palette))
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for i := 0; i < len(img.Palette); i++ {
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s.palette[i] = color.NRGBAModel.Convert(img.Palette[i]).(color.NRGBA)
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}
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}
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return s
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}
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// scan scans the given rectangular region of the image into dst.
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func (s *scanner) scan(x1, y1, x2, y2 int, dst []uint8) {
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switch img := s.image.(type) {
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case *image.NRGBA:
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size := (x2 - x1) * 4
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j := 0
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i := y1*img.Stride + x1*4
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if size == 4 {
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for y := y1; y < y2; y++ {
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d := dst[j : j+4 : j+4]
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s := img.Pix[i : i+4 : i+4]
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d[0] = s[0]
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d[1] = s[1]
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d[2] = s[2]
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d[3] = s[3]
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j += size
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i += img.Stride
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}
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} else {
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for y := y1; y < y2; y++ {
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copy(dst[j:j+size], img.Pix[i:i+size])
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j += size
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i += img.Stride
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}
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}
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case *image.NRGBA64:
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j := 0
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for y := y1; y < y2; y++ {
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i := y*img.Stride + x1*8
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for x := x1; x < x2; x++ {
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s := img.Pix[i : i+8 : i+8]
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d := dst[j : j+4 : j+4]
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d[0] = s[0]
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d[1] = s[2]
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d[2] = s[4]
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d[3] = s[6]
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j += 4
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i += 8
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}
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}
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case *image.RGBA:
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j := 0
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for y := y1; y < y2; y++ {
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i := y*img.Stride + x1*4
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for x := x1; x < x2; x++ {
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d := dst[j : j+4 : j+4]
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a := img.Pix[i+3]
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switch a {
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case 0:
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d[0] = 0
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d[1] = 0
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d[2] = 0
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d[3] = a
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case 0xff:
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s := img.Pix[i : i+4 : i+4]
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d[0] = s[0]
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d[1] = s[1]
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d[2] = s[2]
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d[3] = a
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default:
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s := img.Pix[i : i+4 : i+4]
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r16 := uint16(s[0])
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g16 := uint16(s[1])
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b16 := uint16(s[2])
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a16 := uint16(a)
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d[0] = uint8(r16 * 0xff / a16)
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d[1] = uint8(g16 * 0xff / a16)
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d[2] = uint8(b16 * 0xff / a16)
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d[3] = a
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}
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j += 4
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i += 4
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}
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}
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case *image.RGBA64:
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j := 0
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for y := y1; y < y2; y++ {
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i := y*img.Stride + x1*8
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for x := x1; x < x2; x++ {
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s := img.Pix[i : i+8 : i+8]
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d := dst[j : j+4 : j+4]
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a := s[6]
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switch a {
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case 0:
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d[0] = 0
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d[1] = 0
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d[2] = 0
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case 0xff:
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d[0] = s[0]
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d[1] = s[2]
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d[2] = s[4]
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default:
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r32 := uint32(s[0])<<8 | uint32(s[1])
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g32 := uint32(s[2])<<8 | uint32(s[3])
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b32 := uint32(s[4])<<8 | uint32(s[5])
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a32 := uint32(s[6])<<8 | uint32(s[7])
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d[0] = uint8((r32 * 0xffff / a32) >> 8)
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d[1] = uint8((g32 * 0xffff / a32) >> 8)
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d[2] = uint8((b32 * 0xffff / a32) >> 8)
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}
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d[3] = a
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j += 4
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i += 8
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}
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}
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case *image.Gray:
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j := 0
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for y := y1; y < y2; y++ {
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i := y*img.Stride + x1
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for x := x1; x < x2; x++ {
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c := img.Pix[i]
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d := dst[j : j+4 : j+4]
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d[0] = c
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d[1] = c
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d[2] = c
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d[3] = 0xff
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j += 4
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i++
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}
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}
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case *image.Gray16:
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j := 0
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for y := y1; y < y2; y++ {
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i := y*img.Stride + x1*2
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for x := x1; x < x2; x++ {
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c := img.Pix[i]
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d := dst[j : j+4 : j+4]
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d[0] = c
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d[1] = c
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d[2] = c
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d[3] = 0xff
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j += 4
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i += 2
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}
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}
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case *image.YCbCr:
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j := 0
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x1 += img.Rect.Min.X
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x2 += img.Rect.Min.X
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y1 += img.Rect.Min.Y
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y2 += img.Rect.Min.Y
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hy := img.Rect.Min.Y / 2
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hx := img.Rect.Min.X / 2
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for y := y1; y < y2; y++ {
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iy := (y-img.Rect.Min.Y)*img.YStride + (x1 - img.Rect.Min.X)
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var yBase int
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switch img.SubsampleRatio {
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case image.YCbCrSubsampleRatio444, image.YCbCrSubsampleRatio422:
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yBase = (y - img.Rect.Min.Y) * img.CStride
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case image.YCbCrSubsampleRatio420, image.YCbCrSubsampleRatio440:
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yBase = (y/2 - hy) * img.CStride
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}
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for x := x1; x < x2; x++ {
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var ic int
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switch img.SubsampleRatio {
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case image.YCbCrSubsampleRatio444, image.YCbCrSubsampleRatio440:
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ic = yBase + (x - img.Rect.Min.X)
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case image.YCbCrSubsampleRatio422, image.YCbCrSubsampleRatio420:
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ic = yBase + (x/2 - hx)
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default:
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ic = img.COffset(x, y)
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}
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yy1 := int32(img.Y[iy]) * 0x10101
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cb1 := int32(img.Cb[ic]) - 128
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cr1 := int32(img.Cr[ic]) - 128
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r := yy1 + 91881*cr1
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if uint32(r)&0xff000000 == 0 {
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r >>= 16
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} else {
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r = ^(r >> 31)
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}
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g := yy1 - 22554*cb1 - 46802*cr1
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if uint32(g)&0xff000000 == 0 {
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g >>= 16
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} else {
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g = ^(g >> 31)
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}
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b := yy1 + 116130*cb1
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if uint32(b)&0xff000000 == 0 {
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b >>= 16
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} else {
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b = ^(b >> 31)
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}
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d := dst[j : j+4 : j+4]
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d[0] = uint8(r)
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d[1] = uint8(g)
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d[2] = uint8(b)
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d[3] = 0xff
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iy++
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j += 4
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}
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}
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case *image.Paletted:
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j := 0
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for y := y1; y < y2; y++ {
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i := y*img.Stride + x1
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for x := x1; x < x2; x++ {
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c := s.palette[img.Pix[i]]
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d := dst[j : j+4 : j+4]
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d[0] = c.R
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d[1] = c.G
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d[2] = c.B
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d[3] = c.A
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j += 4
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i++
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}
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}
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default:
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j := 0
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b := s.image.Bounds()
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x1 += b.Min.X
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x2 += b.Min.X
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y1 += b.Min.Y
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y2 += b.Min.Y
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for y := y1; y < y2; y++ {
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for x := x1; x < x2; x++ {
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r16, g16, b16, a16 := s.image.At(x, y).RGBA()
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d := dst[j : j+4 : j+4]
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switch a16 {
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case 0xffff:
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d[0] = uint8(r16 >> 8)
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d[1] = uint8(g16 >> 8)
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d[2] = uint8(b16 >> 8)
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d[3] = 0xff
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case 0:
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d[0] = 0
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d[1] = 0
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d[2] = 0
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d[3] = 0
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default:
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d[0] = uint8(((r16 * 0xffff) / a16) >> 8)
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d[1] = uint8(((g16 * 0xffff) / a16) >> 8)
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d[2] = uint8(((b16 * 0xffff) / a16) >> 8)
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d[3] = uint8(a16 >> 8)
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}
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j += 4
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}
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}
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}
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}
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