├── AUTHORS ├── COPYING ├── README.md ├── goiv.go ├── goiv_darwin.go ├── goiv_drm.go ├── goiv_fb.go ├── goiv_image.go ├── goiv_linux.go ├── goiv_windows.go ├── goiv_x11.go └── manifest └── goiv.exe.manifest /AUTHORS: -------------------------------------------------------------------------------- 1 | Milan Nikolic 2 | -------------------------------------------------------------------------------- /COPYING: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ## goiv 2 | 3 | Small and simple image viewer written in pure Go. 4 | 5 | 6 | ### Features 7 | 8 | * Supports JPEG, PNG, GIF, BMP, PCX, TIFF, PBM, PGM, PPM, WEBP, PSD and TGA formats. 9 | * Scales images to window size and preserves aspect ratio. 10 | * Supports HTTP URLs passed as arguments. 11 | * Cross-platform (note: on macOS you need to install [XQuartz](https://www.xquartz.org/)). 12 | 13 | ![screenshot](https://goo.gl/1Qgqwm) 14 | 15 | 16 | ### Download 17 | 18 | - [Linux 64bit](https://github.com/gen2brain/goiv/releases/download/1.0/goiv-1.0-linux-64bit.tar.gz) 19 | - [Windows 32bit](https://github.com/gen2brain/goiv/releases/download/1.0/goiv-1.0-windows-32bit.zip) 20 | - [macOS 64bit](https://github.com/gen2brain/goiv/releases/download/1.0/goiv-1.0-darwin-64bit.zip) 21 | 22 | 23 | ### Installation 24 | 25 | go get -v github.com/gen2brain/goiv 26 | 27 | 28 | This will install app in `$GOPATH/bin/goiv`. 29 | 30 | Note: On Windows you need to generate manifest .syso file, use this instead: 31 | 32 | go get github.com/akavel/rsrc 33 | 34 | go get -d github.com/gen2brain/goiv 35 | go generate github.com/gen2brain/goiv 36 | go install github.com/gen2brain/goiv 37 | 38 | 39 | ### Keybindings 40 | 41 | * j / Right / PageDown / Space 42 | 43 | `Next image` 44 | 45 | * k / Left / PageUp 46 | 47 | `Previous image` 48 | 49 | * f / F11 50 | 51 | `Fullscreen` 52 | 53 | * [ / ] 54 | 55 | `Go 10 images back/forward` 56 | 57 | * , / . 58 | 59 | `Go to first/last image` 60 | 61 | * q / Escape 62 | 63 | `Quit` 64 | 65 | * Enter 66 | 67 | `Print current image path to stdout` 68 | 69 | 70 | ### Example usage 71 | 72 | * View all images in a directory 73 | 74 | `goiv /path/to/dir/*` 75 | 76 | * View all JPEG's in all subdirectories 77 | 78 | `find . -iname "*.jpg" | goiv` 79 | 80 | * Delete current image when enter is pressed 81 | 82 | `goiv * | xargs rm` 83 | 84 | * Rotate current image when enter is pressed 85 | 86 | `goiv * | xargs -i convert -rotate 90 {} {}` 87 | 88 | 89 | ### Planned features 90 | 91 | - [ ] draw in console on DRM/KMS and Framebuffer (partially implemented) 92 | - [ ] flip image vertically/horizontally 93 | - [ ] rotate image 90 degrees clockwise/counter-clockwise 94 | -------------------------------------------------------------------------------- /goiv.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "bufio" 5 | "flag" 6 | "fmt" 7 | "io" 8 | "os" 9 | "path/filepath" 10 | "strings" 11 | ) 12 | 13 | const ( 14 | appName = "goiv" 15 | appVersion = "1.0" 16 | ) 17 | 18 | func main() { 19 | flag.Usage = usage 20 | 21 | width := flag.Int("w", 1024, "Window width") 22 | height := flag.Int("h", 768, "Window height") 23 | version := flag.Bool("v", false, "Print version and exit") 24 | filelist := flag.String("f", "", "Use list of images from file, one per line") 25 | 26 | flag.Parse() 27 | 28 | if *version { 29 | fmt.Fprintf(os.Stdout, "%s version %s\n", appName, appVersion) 30 | os.Exit(0) 31 | } 32 | 33 | args := arguments(flag.Args()) 34 | 35 | if *filelist != "" { 36 | file, err := os.Open(*filelist) 37 | if err != nil { 38 | fmt.Fprintf(os.Stderr, "%s\n", err.Error()) 39 | os.Exit(1) 40 | } 41 | 42 | ln := lines(file) 43 | args = append(args, ln...) 44 | 45 | file.Close() 46 | } 47 | 48 | if piped() { 49 | ln := lines(os.Stdin) 50 | args = append(args, ln...) 51 | } 52 | 53 | if len(args) == 0 { 54 | flag.Usage() 55 | os.Exit(1) 56 | } 57 | 58 | display(args, *width, *height) 59 | } 60 | 61 | // usage prints default usage. 62 | func usage() { 63 | fmt.Fprintf(os.Stderr, "Usage: %s [FILE1 [FILE2 [...]]]\n", appName) 64 | fmt.Fprintf(os.Stderr, ` 65 | -f path 66 | Use list of images from file, one per line 67 | -w int 68 | Window width (default 1024) 69 | -h int 70 | Window height (default 768) 71 | -v 72 | Print version and exit 73 | 74 | Keybindings: 75 | 76 | j / Right / PageDown / Space 77 | Next image 78 | 79 | k / Left / PageUp 80 | Previous image 81 | 82 | f / F11 83 | Fullscreen 84 | 85 | [ / ] 86 | Go 10 images back/forward 87 | 88 | , / . 89 | Go to first/last image 90 | 91 | q / Escape 92 | Quit 93 | 94 | Enter 95 | Print current image path to stdout`) 96 | fmt.Fprintf(os.Stderr, "\n") 97 | } 98 | 99 | // arguments returns slice of arguments. 100 | func arguments(in []string) []string { 101 | out := make([]string, 0) 102 | for _, arg := range in { 103 | if _, err := os.Stat(arg); err == nil { 104 | out = append(out, arg) 105 | } else { 106 | if isURL(arg) { 107 | out = append(out, arg) 108 | } else { 109 | g, err := filepath.Glob(arg) 110 | if err == nil { 111 | out = append(out, g...) 112 | } 113 | } 114 | } 115 | } 116 | 117 | return out 118 | } 119 | 120 | // lines returns slice of lines from reader. 121 | func lines(r io.Reader) []string { 122 | ln := make([]string, 0) 123 | 124 | scanner := bufio.NewScanner(r) 125 | for scanner.Scan() { 126 | ln = append(ln, scanner.Text()) 127 | } 128 | 129 | return ln 130 | } 131 | 132 | // piped checks if we have a piped stdin. 133 | func piped() bool { 134 | f, err := os.Stdin.Stat() 135 | if err != nil { 136 | return false 137 | } 138 | 139 | if f.Mode()&os.ModeNamedPipe == 0 { 140 | return false 141 | } else { 142 | return true 143 | } 144 | } 145 | 146 | // isURL checks if arguments is URL. 147 | func isURL(arg string) bool { 148 | if strings.HasPrefix(arg, "http://") || strings.HasPrefix(arg, "https://") { 149 | return true 150 | } 151 | 152 | return false 153 | } 154 | -------------------------------------------------------------------------------- /goiv_darwin.go: -------------------------------------------------------------------------------- 1 | // +build darwin 2 | 3 | package main 4 | 5 | func display(images []string, width, height int) { 6 | displayX11(images, width, height) 7 | } 8 | -------------------------------------------------------------------------------- /goiv_drm.go: -------------------------------------------------------------------------------- 1 | // +build linux 2 | 3 | package main 4 | 5 | import ( 6 | "bytes" 7 | "fmt" 8 | "os" 9 | "unsafe" 10 | 11 | "github.com/NeowayLabs/drm" 12 | "github.com/NeowayLabs/drm/mode" 13 | "github.com/edsrzf/mmap-go" 14 | "github.com/pkg/term" 15 | ) 16 | 17 | type frameBuffer struct { 18 | id uint32 19 | handle uint32 20 | data []byte 21 | fb *mode.FB 22 | size uint64 23 | stride uint32 24 | } 25 | 26 | type msetData struct { 27 | mode *mode.Modeset 28 | fb frameBuffer 29 | savedCrtc *mode.Crtc 30 | } 31 | 32 | // displayDRM displays images on DRM. 33 | func displayDRM(images []string) error { 34 | file, err := drm.OpenCard(0) 35 | if err != nil { 36 | return err 37 | } 38 | 39 | defer file.Close() 40 | 41 | if !drm.HasDumbBuffer(file) { 42 | return fmt.Errorf("drm device does not support dumb buffers") 43 | } 44 | 45 | modeset, err := mode.NewSimpleModeset(file) 46 | if err != nil { 47 | return fmt.Errorf("NewSimpleModeset: %s", err.Error()) 48 | } 49 | 50 | var msets []msetData 51 | for _, mod := range modeset.Modesets { 52 | framebuf, err := createFramebuffer(file, &mod) 53 | if err != nil { 54 | cleanup(modeset, msets, file) 55 | return err 56 | } 57 | 58 | savedCrtc, err := mode.GetCrtc(file, mod.Crtc) 59 | if err != nil { 60 | cleanup(modeset, msets, file) 61 | return fmt.Errorf("GetCrtc: %s", err.Error()) 62 | } 63 | 64 | err = mode.SetCrtc(file, mod.Crtc, framebuf.id, 0, 0, &mod.Conn, 1, &mod.Mode) 65 | if err != nil { 66 | cleanup(modeset, msets, file) 67 | return fmt.Errorf("SetCrtc: %s", err.Error()) 68 | } 69 | 70 | msets = append(msets, msetData{ 71 | mode: &mod, 72 | fb: framebuf, 73 | savedCrtc: savedCrtc, 74 | }) 75 | } 76 | 77 | t, err := term.Open("/dev/tty") 78 | if err != nil { 79 | return fmt.Errorf("Open: %s", err.Error()) 80 | } 81 | 82 | err = t.SetRaw() 83 | if err != nil { 84 | return fmt.Errorf("SetRaw: %s", err.Error()) 85 | } 86 | 87 | defer t.Restore() 88 | defer t.Close() 89 | 90 | idx := 0 91 | 92 | update := func() error { 93 | var off uint32 94 | 95 | img, err := decode(images[idx], int(msets[0].fb.fb.Width), int(msets[0].fb.fb.Height)) 96 | if err != nil { 97 | return err 98 | } 99 | 100 | bounds := img.Bounds() 101 | 102 | for j := 0; j < len(msets); j++ { 103 | mset := msets[j] 104 | for y := bounds.Min.Y; y < bounds.Max.Y; y++ { 105 | for x := bounds.Min.X; x < bounds.Max.X; x++ { 106 | r, g, b, _ := img.At(x, y).RGBA() 107 | off = mset.fb.stride*uint32(y) + uint32(x)*4 108 | val := uint32((uint32(r) << 16) | (uint32(g) << 8) | uint32(b)) 109 | *(*uint32)(unsafe.Pointer(&mset.fb.data[off])) = val 110 | } 111 | } 112 | } 113 | 114 | return nil 115 | } 116 | 117 | char := func() ([]byte, error) { 118 | bytes := make([]byte, 3) 119 | n, err := t.Read(bytes) 120 | if err != nil { 121 | return nil, err 122 | } 123 | 124 | return bytes[0:n], nil 125 | } 126 | 127 | wait := func() { 128 | for { 129 | c, err := char() 130 | if err != nil { 131 | fmt.Fprintf(os.Stderr, "%s\n", err.Error()) 132 | } 133 | 134 | switch { 135 | case bytes.Equal(c, []byte{3}), bytes.Equal(c, []byte{113}), bytes.Equal(c, []byte{27}): // ctrl+c, q, Esc 136 | return 137 | case bytes.Equal(c, []byte{27, 91, 68}), bytes.Equal(c, []byte{27, 91, 53}), bytes.Equal(c, []byte{107}): // Left, Page_Up, k 138 | if idx != 0 { 139 | idx -= 1 140 | update() 141 | } 142 | case bytes.Equal(c, []byte{27, 91, 67}), bytes.Equal(c, []byte{27, 91, 54}), bytes.Equal(c, []byte{106}), bytes.Equal(c, []byte{32}): // Right, Page_Down, j, Space 143 | if idx != len(images)-1 { 144 | idx += 1 145 | update() 146 | } 147 | case bytes.Equal(c, []byte{91}): // [ 148 | if idx+10 <= len(images)-1 { 149 | idx += 10 150 | update() 151 | } 152 | case bytes.Equal(c, []byte{93}): // ] 153 | if idx+10 <= len(images)-1 { 154 | idx += 10 155 | update() 156 | } 157 | case bytes.Equal(c, []byte{44}): // , 158 | idx = 0 159 | update() 160 | case bytes.Equal(c, []byte{46}): // . 161 | idx = len(images) - 1 162 | update() 163 | case bytes.Equal(c, []byte{13}): // Return 164 | fmt.Fprintf(os.Stdout, "%s\n", images[idx]) 165 | } 166 | } 167 | } 168 | 169 | err = update() 170 | if err != nil { 171 | return err 172 | } 173 | 174 | wait() 175 | 176 | cleanup(modeset, msets, file) 177 | 178 | return nil 179 | } 180 | 181 | func createFramebuffer(file *os.File, dev *mode.Modeset) (frameBuffer, error) { 182 | fb, err := mode.CreateFB(file, dev.Width, dev.Height, 32) 183 | if err != nil { 184 | return frameBuffer{}, fmt.Errorf("CreateFB: %s", err.Error()) 185 | } 186 | 187 | stride := fb.Pitch 188 | size := fb.Size 189 | handle := fb.Handle 190 | 191 | fbID, err := mode.AddFB(file, dev.Width, dev.Height, 24, 32, stride, handle) 192 | if err != nil { 193 | return frameBuffer{}, fmt.Errorf("AddFB: %s", err.Error()) 194 | } 195 | 196 | offset, err := mode.MapDumb(file, handle) 197 | if err != nil { 198 | return frameBuffer{}, err 199 | } 200 | 201 | mm, err := mmap.MapRegion(file, int(size), mmap.RDWR, 0x01, int64(offset)) 202 | if err != nil { 203 | return frameBuffer{}, fmt.Errorf("Map: %s", err.Error()) 204 | } 205 | 206 | for i := uint64(0); i < size; i++ { 207 | mm[i] = 0 208 | } 209 | 210 | framebuf := frameBuffer{ 211 | id: fbID, 212 | handle: handle, 213 | data: mm, 214 | fb: fb, 215 | size: size, 216 | stride: stride, 217 | } 218 | 219 | return framebuf, nil 220 | } 221 | 222 | func destroyFramebuffer(modeset *mode.SimpleModeset, mset msetData, file *os.File) error { 223 | handle := mset.fb.handle 224 | data := mset.fb.data 225 | fb := mset.fb 226 | 227 | err := mmap.MMap(data).Unlock() 228 | if err != nil { 229 | return fmt.Errorf("UnsafeUnmap: %s", err.Error()) 230 | } 231 | 232 | err = mode.RmFB(file, fb.id) 233 | if err != nil { 234 | return fmt.Errorf("RmFB: %s", err.Error()) 235 | } 236 | 237 | err = mode.DestroyDumb(file, handle) 238 | if err != nil { 239 | return fmt.Errorf("DestroyDumb: %s", err.Error()) 240 | } 241 | 242 | return modeset.SetCrtc(mset.mode, mset.savedCrtc) 243 | } 244 | 245 | func cleanup(modeset *mode.SimpleModeset, msets []msetData, file *os.File) { 246 | for _, mset := range msets { 247 | err := destroyFramebuffer(modeset, mset, file) 248 | if err != nil { 249 | fmt.Fprintf(os.Stderr, "%s\n", err.Error()) 250 | } 251 | } 252 | } 253 | -------------------------------------------------------------------------------- /goiv_fb.go: -------------------------------------------------------------------------------- 1 | // +build linux 2 | 3 | package main 4 | 5 | import ( 6 | "bytes" 7 | "fmt" 8 | "image" 9 | "image/draw" 10 | "os" 11 | 12 | "github.com/gen2brain/framebuffer" 13 | "github.com/pkg/term" 14 | ) 15 | 16 | // displayFB displays images on Linux framebuffer. 17 | func displayFB(images []string) error { 18 | canvas, err := framebuffer.Open(nil) 19 | if err != nil { 20 | return fmt.Errorf("Open: %s", err.Error()) 21 | } 22 | 23 | defer canvas.Close() 24 | 25 | mode, err := canvas.CurrentMode() 26 | if err != nil { 27 | return fmt.Errorf("CurrentMode: %s", err.Error()) 28 | } 29 | 30 | fb, err := canvas.Image() 31 | if err != nil { 32 | return fmt.Errorf("Image: %s", err.Error()) 33 | } 34 | 35 | t, err := term.Open("/dev/tty") 36 | if err != nil { 37 | return fmt.Errorf("Open: %s", err.Error()) 38 | } 39 | 40 | err = t.SetRaw() 41 | if err != nil { 42 | return fmt.Errorf("SetRaw: %s", err.Error()) 43 | } 44 | 45 | defer t.Restore() 46 | defer t.Close() 47 | 48 | idx := 0 49 | var img image.Image 50 | 51 | update := func() error { 52 | img, err = decode(images[idx], mode.Geometry.XRes, mode.Geometry.YRes) 53 | if err != nil { 54 | return err 55 | } 56 | 57 | fbb := fb.Bounds() 58 | imgb := img.Bounds() 59 | 60 | imgb = imgb.Add(image.Point{ 61 | (fbb.Dx() / 2) - (imgb.Dx() / 2), 62 | (fbb.Dy() / 2) - (imgb.Dy() / 2), 63 | }) 64 | 65 | draw.Draw(fb, imgb, img, image.ZP, draw.Src) 66 | 67 | return nil 68 | } 69 | 70 | char := func() ([]byte, error) { 71 | bytes := make([]byte, 3) 72 | n, err := t.Read(bytes) 73 | if err != nil { 74 | return nil, err 75 | } 76 | 77 | return bytes[0:n], nil 78 | } 79 | 80 | wait := func() { 81 | for { 82 | c, err := char() 83 | if err != nil { 84 | fmt.Fprintf(os.Stderr, "%s\n", err.Error()) 85 | } 86 | 87 | switch { 88 | case bytes.Equal(c, []byte{3}), bytes.Equal(c, []byte{113}), bytes.Equal(c, []byte{27}): // ctrl+c, q, Esc 89 | return 90 | case bytes.Equal(c, []byte{27, 91, 68}), bytes.Equal(c, []byte{27, 91, 53}), bytes.Equal(c, []byte{107}): // Left, Page_Up, k 91 | if idx != 0 { 92 | idx -= 1 93 | update() 94 | } 95 | case bytes.Equal(c, []byte{27, 91, 67}), bytes.Equal(c, []byte{27, 91, 54}), bytes.Equal(c, []byte{106}), bytes.Equal(c, []byte{32}): // Right, Page_Down, j, Space 96 | if idx != len(images)-1 { 97 | idx += 1 98 | update() 99 | } 100 | case bytes.Equal(c, []byte{91}): // [ 101 | if idx+10 <= len(images)-1 { 102 | idx += 10 103 | update() 104 | } 105 | case bytes.Equal(c, []byte{93}): // ] 106 | if idx+10 <= len(images)-1 { 107 | idx += 10 108 | update() 109 | } 110 | case bytes.Equal(c, []byte{44}): // , 111 | idx = 0 112 | update() 113 | case bytes.Equal(c, []byte{46}): // . 114 | idx = len(images) - 1 115 | update() 116 | case bytes.Equal(c, []byte{13}): // Return 117 | fmt.Fprintf(os.Stdout, "%s\n", images[idx]) 118 | } 119 | } 120 | } 121 | 122 | err = update() 123 | if err != nil { 124 | return err 125 | } 126 | 127 | wait() 128 | 129 | return nil 130 | } 131 | -------------------------------------------------------------------------------- /goiv_image.go: -------------------------------------------------------------------------------- 1 | // +build !imagick 2 | 3 | package main 4 | 5 | import ( 6 | "fmt" 7 | "image" 8 | "io/ioutil" 9 | "net/http" 10 | "os" 11 | 12 | _ "image/gif" 13 | _ "image/jpeg" 14 | _ "image/png" 15 | 16 | _ "github.com/hotei/bmp" 17 | _ "github.com/jbuchbinder/gopnm" 18 | _ "github.com/oov/psd" 19 | _ "github.com/samuel/go-pcx/pcx" 20 | _ "golang.org/x/image/tiff" 21 | _ "golang.org/x/image/webp" 22 | 23 | "github.com/blezek/tga" 24 | "github.com/nfnt/resize" 25 | ) 26 | 27 | func init() { 28 | tga.RegisterFormat() 29 | } 30 | 31 | // decode decodes image. 32 | func decode(filename string, width, height int) (img image.Image, err error) { 33 | if isURL(filename) { 34 | img, err = decodeURL(filename) 35 | } else { 36 | img, err = decodeFile(filename) 37 | } 38 | 39 | if err != nil { 40 | return nil, err 41 | } 42 | 43 | return scale(img, width, height) 44 | } 45 | 46 | // decodeFile decodes image file. 47 | func decodeFile(filename string) (image.Image, error) { 48 | file, err := os.Open(filename) 49 | if err != nil { 50 | return nil, fmt.Errorf("%s: %s", filename, err) 51 | } 52 | 53 | img, _, err := image.Decode(file) 54 | if err != nil { 55 | return nil, fmt.Errorf("%s: %s", filename, err) 56 | } 57 | 58 | return img, nil 59 | } 60 | 61 | // decodeURL decodes image from URL. 62 | func decodeURL(url string) (image.Image, error) { 63 | res, err := http.Get(url) 64 | if err != nil { 65 | return nil, fmt.Errorf("%s: %s", url, err) 66 | } 67 | 68 | defer res.Body.Close() 69 | 70 | img, _, err := image.Decode(res.Body) 71 | if err != nil { 72 | return nil, fmt.Errorf("%s: %s", url, err) 73 | } 74 | 75 | return img, nil 76 | } 77 | 78 | // downloadURL returns bytes from URL. 79 | func downloadURL(url string) ([]byte, error) { 80 | res, err := http.Get(url) 81 | if err != nil { 82 | return nil, fmt.Errorf("%s: %s", url, err) 83 | } 84 | 85 | defer res.Body.Close() 86 | 87 | return ioutil.ReadAll(res.Body) 88 | } 89 | 90 | // scale scales image keeping aspect ratio. 91 | func scale(img image.Image, width, height int) (image.Image, error) { 92 | return resize.Resize(0, uint(height), img, resize.NearestNeighbor), nil 93 | } 94 | -------------------------------------------------------------------------------- /goiv_linux.go: -------------------------------------------------------------------------------- 1 | // +build linux 2 | 3 | package main 4 | 5 | import ( 6 | "fmt" 7 | "os" 8 | ) 9 | 10 | func display(images []string, width, height int) { 11 | if os.Getenv("DISPLAY") == "" { 12 | err := displayDRM(images) 13 | if err != nil { 14 | e := displayFB(images) 15 | if e != nil { 16 | fmt.Fprintf(os.Stderr, "%s; %s\n", err.Error(), e.Error()) 17 | } 18 | } 19 | } else { 20 | displayX11(images, width, height) 21 | } 22 | } 23 | -------------------------------------------------------------------------------- /goiv_windows.go: -------------------------------------------------------------------------------- 1 | // +build windows 2 | 3 | package main 4 | 5 | import ( 6 | "fmt" 7 | "io/ioutil" 8 | "os" 9 | 10 | "github.com/lxn/walk" 11 | decl "github.com/lxn/walk/declarative" 12 | ) 13 | 14 | //go:generate rsrc -manifest manifest/goiv.exe.manifest -o goiv_windows.syso 15 | 16 | func display(images []string, width, height int) { 17 | mw := new(Window) 18 | mw.images = images 19 | 20 | keyEvent := func(key walk.Key) { 21 | switch key { 22 | case walk.KeyQ, walk.KeyEscape: 23 | mw.Close() 24 | case walk.KeyPrior, walk.KeyLeft, walk.KeyK, walk.KeyLButton: 25 | if mw.idx != 0 { 26 | mw.idx -= 1 27 | mw.drawImageError() 28 | } 29 | case walk.KeyNext, walk.KeyRight, walk.KeyJ, walk.KeyRButton, walk.KeySpace: 30 | if mw.idx != len(mw.images)-1 { 31 | mw.idx += 1 32 | mw.drawImageError() 33 | } 34 | case walk.KeyF11, walk.KeyF: 35 | mw.SetFullscreen(!mw.Fullscreen()) 36 | case walk.KeyOEM4: 37 | if mw.idx-10 >= 0 { 38 | mw.idx -= 10 39 | mw.drawImageError() 40 | } 41 | case walk.KeyOEM6: 42 | if mw.idx+10 <= len(mw.images)-1 { 43 | mw.idx += 10 44 | mw.drawImageError() 45 | } 46 | case walk.KeyOEMComma: 47 | mw.idx = 0 48 | mw.drawImageError() 49 | case walk.KeyOEMPeriod: 50 | mw.idx = len(mw.images) - 1 51 | mw.drawImageError() 52 | case walk.KeyReturn: 53 | fmt.Fprintf(os.Stdout, "%s\n", mw.images[mw.idx]) 54 | } 55 | } 56 | 57 | mouseEvent := func(x, y int, button walk.MouseButton) { 58 | switch button { 59 | case walk.RightButton: 60 | if mw.idx != 0 { 61 | mw.idx -= 1 62 | mw.drawImageError() 63 | } 64 | case walk.LeftButton: 65 | if mw.idx != len(mw.images)-1 { 66 | mw.idx += 1 67 | mw.drawImageError() 68 | } 69 | } 70 | } 71 | 72 | if err := (decl.MainWindow{ 73 | AssignTo: &mw.MainWindow, 74 | OnKeyDown: keyEvent, 75 | OnMouseDown: mouseEvent, 76 | MinSize: decl.Size{320, 240}, 77 | Size: decl.Size{width, height}, 78 | Layout: decl.VBox{MarginsZero: true, SpacingZero: true}, 79 | Children: []decl.Widget{ 80 | decl.ImageView{ 81 | AssignTo: &mw.imageView, 82 | Background: decl.SolidColorBrush{Color: walk.RGB(0, 0, 0)}, 83 | OnKeyDown: keyEvent, 84 | OnMouseDown: mouseEvent, 85 | }, 86 | }, 87 | }.Create()); err != nil { 88 | fmt.Fprintf(os.Stderr, "%s\n", err.Error()) 89 | os.Exit(1) 90 | } 91 | 92 | mw.drawImageError() 93 | 94 | mw.Run() 95 | } 96 | 97 | type Window struct { 98 | *walk.MainWindow 99 | 100 | image walk.Image 101 | imageView *walk.ImageView 102 | 103 | idx int 104 | images []string 105 | } 106 | 107 | func (mw *Window) drawImageError() { 108 | if err := mw.drawImage(); err != nil { 109 | fmt.Fprintf(os.Stderr, "%s\n", err.Error()) 110 | } 111 | } 112 | 113 | func (mw *Window) drawImage() error { 114 | var err error 115 | 116 | if mw.image != nil { 117 | mw.image.Dispose() 118 | mw.image = nil 119 | } 120 | 121 | if isURL(mw.images[mw.idx]) { 122 | b, err := downloadURL(mw.images[mw.idx]) 123 | if err != nil { 124 | return err 125 | } 126 | 127 | tmp, err := ioutil.TempFile("", "goiv") 128 | if err != nil { 129 | return err 130 | } 131 | 132 | _, err = tmp.Write(b) 133 | if err != nil { 134 | return err 135 | } 136 | 137 | err = tmp.Close() 138 | if err != nil { 139 | return err 140 | } 141 | 142 | defer os.Remove(tmp.Name()) 143 | 144 | mw.image, err = walk.NewImageFromFile(tmp.Name()) 145 | if err != nil { 146 | return err 147 | } 148 | } else { 149 | mw.image, err = walk.NewImageFromFile(mw.images[mw.idx]) 150 | if err != nil { 151 | return err 152 | } 153 | } 154 | 155 | var succeeded bool 156 | defer func() { 157 | if !succeeded { 158 | if mw.image != nil { 159 | mw.image.Dispose() 160 | } 161 | } 162 | }() 163 | 164 | if mw.imageView == nil { 165 | mw.imageView, err = walk.NewImageView(mw) 166 | if err != nil { 167 | return err 168 | } 169 | } 170 | 171 | mw.imageView.SetMode(walk.ImageViewModeShrink) 172 | if err = mw.imageView.SetImage(mw.image); err != nil { 173 | return err 174 | } 175 | 176 | title := fmt.Sprintf("%s [%d of %d] - %s (%dx%d)", appName, mw.idx+1, len(mw.images), 177 | mw.images[mw.idx], mw.image.Size().Width, mw.image.Size().Height) 178 | mw.SetTitle(title) 179 | 180 | succeeded = true 181 | 182 | return nil 183 | } 184 | -------------------------------------------------------------------------------- /goiv_x11.go: -------------------------------------------------------------------------------- 1 | // +build darwin dragonfly freebsd linux netbsd openbsd 2 | 3 | package main 4 | 5 | import ( 6 | "fmt" 7 | "image" 8 | "image/draw" 9 | "io/ioutil" 10 | "os" 11 | 12 | "github.com/BurntSushi/xgb" 13 | mshm "github.com/BurntSushi/xgb/shm" 14 | "github.com/BurntSushi/xgb/xproto" 15 | "github.com/BurntSushi/xgbutil" 16 | "github.com/BurntSushi/xgbutil/ewmh" 17 | "github.com/BurntSushi/xgbutil/keybind" 18 | "github.com/BurntSushi/xgbutil/mousebind" 19 | "github.com/BurntSushi/xgbutil/xevent" 20 | "github.com/BurntSushi/xgbutil/xgraphics" 21 | "github.com/BurntSushi/xgbutil/xwindow" 22 | "github.com/gen2brain/shm" 23 | ) 24 | 25 | const ( 26 | none = 1 << iota 27 | loaded 28 | scaled 29 | drawn 30 | ) 31 | 32 | // displayX11 displays images in X11 window. 33 | func displayX11(images []string, width, height int) { 34 | xgb.Logger.SetOutput(ioutil.Discard) 35 | xgbutil.Logger.SetOutput(ioutil.Discard) 36 | 37 | X, err := xgbutil.NewConn() 38 | if err != nil { 39 | fmt.Fprintf(os.Stderr, "%s\n", err.Error()) 40 | os.Exit(1) 41 | } 42 | 43 | useShm := true 44 | err = mshm.Init(X.Conn()) 45 | if err != nil { 46 | useShm = false 47 | } 48 | 49 | keybind.Initialize(X) 50 | mousebind.Initialize(X) 51 | 52 | win, err := xwindow.Generate(X) 53 | if err != nil { 54 | fmt.Fprintf(os.Stderr, "Generate: %s\n", err.Error()) 55 | os.Exit(1) 56 | } 57 | 58 | defer win.Destroy() 59 | 60 | win.Create(X.RootWin(), 0, 0, width, height, xproto.CwBackPixel, 0x000000) 61 | win.Change(xproto.CwBackingStore, xproto.BackingStoreAlways) 62 | 63 | win.WMGracefulClose(func(w *xwindow.Window) { 64 | xevent.Detach(w.X, w.Id) 65 | keybind.Detach(w.X, w.Id) 66 | mousebind.Detach(w.X, w.Id) 67 | w.Destroy() 68 | xevent.Quit(w.X) 69 | }) 70 | 71 | err = ewmh.WmWindowTypeSet(X, win.Id, []string{"_NET_WM_WINDOW_TYPE_DIALOG"}) 72 | if err != nil { 73 | fmt.Fprintf(os.Stderr, "WmWindowTypeSet: %s\n", err.Error()) 74 | } 75 | 76 | win.Listen(xproto.EventMaskKeyPress, xproto.EventMaskButtonRelease, xproto.EventMaskStructureNotify, xproto.EventMaskExposure) 77 | 78 | idx := 0 79 | state := 0 80 | 81 | rect, err := win.Geometry() 82 | if err != nil { 83 | fmt.Fprintf(os.Stderr, "Geometry: %s\n", err.Error()) 84 | } 85 | 86 | var shmId int 87 | var seg mshm.Seg 88 | var data []byte 89 | 90 | var img image.Image 91 | var ximg *xgraphics.Image 92 | 93 | newImage := func() *xgraphics.Image { 94 | var i *xgraphics.Image 95 | 96 | if useShm { 97 | shmSize := rect.Width() * rect.Height() * 4 98 | 99 | shmId, err = shm.Get(shm.IPC_PRIVATE, shmSize, shm.IPC_CREAT|0777) 100 | if err != nil { 101 | fmt.Fprintf(os.Stderr, "Get: %s\n", err.Error()) 102 | } 103 | 104 | seg, err = mshm.NewSegId(X.Conn()) 105 | if err != nil { 106 | fmt.Fprintf(os.Stderr, "NewSegId: %s\n", err.Error()) 107 | } 108 | 109 | data, err = shm.At(shmId, 0, 0) 110 | if err != nil { 111 | fmt.Fprintf(os.Stderr, "At: %s\n", err.Error()) 112 | } 113 | 114 | mshm.Attach(X.Conn(), seg, uint32(shmId), false) 115 | 116 | i = &xgraphics.Image{ 117 | X: X, 118 | Pixmap: 0, 119 | Pix: data, 120 | Stride: 4 * rect.Width(), 121 | Rect: image.Rect(0, 0, rect.Width(), rect.Height()), 122 | Subimg: false, 123 | } 124 | } else { 125 | i = xgraphics.New(X, image.Rect(0, 0, rect.Width(), rect.Height())) 126 | } 127 | 128 | return i 129 | } 130 | 131 | ximg = newImage() 132 | 133 | loadImage := func() { 134 | img, err = decode(images[idx], rect.Width(), rect.Height()) 135 | if err != nil { 136 | fmt.Fprintf(os.Stderr, "%s\n", err.Error()) 137 | return 138 | } 139 | 140 | state |= loaded 141 | } 142 | 143 | scaleImage := func() { 144 | if ximg != nil { 145 | ximg.Destroy() 146 | ximg = nil 147 | } 148 | 149 | if useShm { 150 | mshm.Detach(X.Conn(), seg) 151 | shm.Rm(shmId) 152 | shm.Dt(data) 153 | } 154 | 155 | ximg = newImage() 156 | 157 | i, err := scale(img, rect.Width(), rect.Height()) 158 | if err != nil { 159 | fmt.Fprintf(os.Stderr, "scale: %s\n", err.Error()) 160 | } 161 | 162 | offset := (rect.Width() - i.Bounds().Max.X) / 2 163 | draw.Draw(ximg, i.Bounds().Add(image.Pt(offset, 0)), i, image.ZP, draw.Over) 164 | 165 | state |= scaled 166 | } 167 | 168 | drawImage := func() { 169 | title := fmt.Sprintf("%s [%d of %d] - %s (%dx%d)", appName, idx+1, len(images), 170 | images[idx], img.Bounds().Max.X, img.Bounds().Max.Y) 171 | 172 | err = ewmh.WmNameSet(ximg.X, win.Id, title) 173 | if err != nil { 174 | fmt.Fprintf(os.Stderr, "WmNameSet: %s\n", err.Error()) 175 | } 176 | 177 | if useShm { 178 | pid, err := xproto.NewPixmapId(ximg.X.Conn()) 179 | if err != nil { 180 | fmt.Fprintf(os.Stderr, "NewPixmapId: %s\n", err.Error()) 181 | } 182 | 183 | mshm.CreatePixmap(X.Conn(), pid, xproto.Drawable(ximg.X.RootWin()), 184 | uint16(ximg.Bounds().Dx()), uint16(ximg.Bounds().Dy()), 185 | ximg.X.Screen().RootDepth, seg, 0) 186 | 187 | ximg.Pixmap = pid 188 | 189 | mshm.PutImage(X.Conn(), xproto.Drawable(ximg.Pixmap), ximg.X.GC(), 190 | uint16(ximg.Bounds().Dx()), uint16(ximg.Bounds().Dy()), 191 | 0, 0, 0, 0, 0, 0, ximg.X.Screen().RootDepth, 192 | xproto.ImageFormatZPixmap, 0, seg, 0) 193 | 194 | ximg.XExpPaint(win.Id, 0, 0) 195 | } else { 196 | err = ximg.CreatePixmap() 197 | if err != nil { 198 | fmt.Fprintf(os.Stderr, "CreatePixmap: %s\n", err.Error()) 199 | } 200 | 201 | ximg.XDraw() 202 | ximg.XExpPaint(win.Id, 0, 0) 203 | } 204 | 205 | state |= drawn 206 | } 207 | 208 | update := func() { 209 | if state&loaded == 0 { 210 | loadImage() 211 | if img == nil { 212 | return 213 | } 214 | } 215 | if state&scaled == 0 { 216 | scaleImage() 217 | } 218 | if state&drawn == 0 { 219 | drawImage() 220 | } 221 | } 222 | 223 | cbKey := xevent.KeyPressFun(func(xu *xgbutil.XUtil, e xevent.KeyPressEvent) { 224 | if keybind.KeyMatch(X, "Escape", e.State, e.Detail) || keybind.KeyMatch(X, "q", e.State, e.Detail) { 225 | xevent.Quit(X) 226 | } 227 | 228 | if keybind.KeyMatch(xu, "Left", e.State, e.Detail) || keybind.KeyMatch(xu, "Page_Up", e.State, e.Detail) || keybind.KeyMatch(xu, "k", e.State, e.Detail) { 229 | if idx != 0 { 230 | idx -= 1 231 | state &= loaded 232 | state &= drawn 233 | update() 234 | } 235 | } else if keybind.KeyMatch(xu, "Right", e.State, e.Detail) || keybind.KeyMatch(xu, "Page_Down", e.State, e.Detail) || 236 | keybind.KeyMatch(xu, "j", e.State, e.Detail) || keybind.KeyMatch(xu, " ", e.State, e.Detail) { 237 | if idx != len(images)-1 { 238 | idx += 1 239 | state &= loaded 240 | state &= drawn 241 | update() 242 | } 243 | } 244 | 245 | if keybind.KeyMatch(X, "F11", e.State, e.Detail) || keybind.KeyMatch(X, "f", e.State, e.Detail) || keybind.KeyMatch(X, "L1", e.State, e.Detail) { 246 | err = ewmh.WmStateReq(X, win.Id, ewmh.StateToggle, "_NET_WM_STATE_FULLSCREEN") 247 | if err != nil { 248 | fmt.Fprintf(os.Stderr, "WmStateReq: %s\n", err.Error()) 249 | } 250 | } 251 | 252 | if keybind.KeyMatch(X, "[", e.State, e.Detail) { 253 | if idx-10 >= 0 { 254 | idx -= 10 255 | state &= loaded 256 | state &= drawn 257 | update() 258 | } 259 | } else if keybind.KeyMatch(X, "]", e.State, e.Detail) { 260 | if idx+10 <= len(images)-1 { 261 | idx += 10 262 | state &= loaded 263 | state &= drawn 264 | update() 265 | } 266 | } 267 | 268 | if keybind.KeyMatch(X, ",", e.State, e.Detail) { 269 | idx = 0 270 | state &= loaded 271 | state &= drawn 272 | update() 273 | } else if keybind.KeyMatch(X, ".", e.State, e.Detail) { 274 | idx = len(images) - 1 275 | state &= loaded 276 | state &= drawn 277 | update() 278 | } 279 | 280 | if keybind.KeyMatch(X, "Return", e.State, e.Detail) { 281 | fmt.Fprintf(os.Stdout, "%s\n", images[idx]) 282 | } 283 | }) 284 | 285 | cbBut := mousebind.ButtonReleaseFun(func(xu *xgbutil.XUtil, e xevent.ButtonReleaseEvent) { 286 | if e.Detail == 1 { 287 | if idx != len(images)-1 { 288 | idx += 1 289 | state &= loaded 290 | state &= drawn 291 | update() 292 | } 293 | } else if e.Detail == 3 { 294 | if idx != 0 { 295 | idx -= 1 296 | state &= loaded 297 | state &= drawn 298 | update() 299 | } 300 | } 301 | }) 302 | 303 | cbCfg := xevent.ConfigureNotifyFun(func(xu *xgbutil.XUtil, e xevent.ConfigureNotifyEvent) { 304 | if rect.Width() != int(e.Width) || rect.Height() != int(e.Height) { 305 | state &= drawn 306 | state &= scaled 307 | 308 | rect, err = win.Geometry() 309 | if err != nil { 310 | fmt.Fprintf(os.Stderr, "Geometry: %s\n", err.Error()) 311 | } 312 | } 313 | }) 314 | 315 | cbExp := xevent.ExposeFun(func(xu *xgbutil.XUtil, e xevent.ExposeEvent) { 316 | if e.ExposeEvent.Count == 0 { 317 | state &= drawn 318 | state &= scaled 319 | update() 320 | } 321 | }) 322 | 323 | cbKey.Connect(X, win.Id) 324 | cbCfg.Connect(X, win.Id) 325 | cbBut.Connect(X, win.Id, "1", false, true) 326 | cbBut.Connect(X, win.Id, "3", false, true) 327 | cbExp.Connect(X, win.Id) 328 | 329 | win.Map() 330 | xevent.Main(X) 331 | 332 | if useShm { 333 | mshm.Detach(X.Conn(), seg) 334 | shm.Rm(shmId) 335 | shm.Dt(data) 336 | } 337 | } 338 | -------------------------------------------------------------------------------- /manifest/goiv.exe.manifest: -------------------------------------------------------------------------------- 1 |  2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | true 12 | 13 | 14 | 15 | --------------------------------------------------------------------------------