├── tmp └── .gitkeep ├── .gitignore ├── static ├── gopher.png └── Hack-Regular.ttf ├── examples ├── diamond.png ├── gopher.png ├── heart.png ├── pikachu.gif ├── pikachu.jpg ├── rocket.png ├── gopher.codeposter.png ├── heart.codeposter.png ├── rocket.codeposter.png ├── diamond.codeposter.png ├── pikachu.codeposter.png └── jquery.min.js ├── Makefile ├── go.mod ├── README.md ├── go.sum └── main.go /tmp/.gitkeep: -------------------------------------------------------------------------------- 1 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | .DS_Store 2 | tmp/* 3 | !tmp/.gitkeep 4 | -------------------------------------------------------------------------------- /static/gopher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cj1128/codeposter/HEAD/static/gopher.png -------------------------------------------------------------------------------- /examples/diamond.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cj1128/codeposter/HEAD/examples/diamond.png -------------------------------------------------------------------------------- /examples/gopher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cj1128/codeposter/HEAD/examples/gopher.png -------------------------------------------------------------------------------- /examples/heart.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cj1128/codeposter/HEAD/examples/heart.png -------------------------------------------------------------------------------- /examples/pikachu.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cj1128/codeposter/HEAD/examples/pikachu.gif -------------------------------------------------------------------------------- /examples/pikachu.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cj1128/codeposter/HEAD/examples/pikachu.jpg -------------------------------------------------------------------------------- /examples/rocket.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cj1128/codeposter/HEAD/examples/rocket.png -------------------------------------------------------------------------------- /static/Hack-Regular.ttf: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cj1128/codeposter/HEAD/static/Hack-Regular.ttf -------------------------------------------------------------------------------- /examples/gopher.codeposter.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cj1128/codeposter/HEAD/examples/gopher.codeposter.png -------------------------------------------------------------------------------- /examples/heart.codeposter.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cj1128/codeposter/HEAD/examples/heart.codeposter.png -------------------------------------------------------------------------------- /examples/rocket.codeposter.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cj1128/codeposter/HEAD/examples/rocket.codeposter.png -------------------------------------------------------------------------------- /examples/diamond.codeposter.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cj1128/codeposter/HEAD/examples/diamond.codeposter.png -------------------------------------------------------------------------------- /examples/pikachu.codeposter.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cj1128/codeposter/HEAD/examples/pikachu.codeposter.png -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | SHELL := /bin/bash 2 | 3 | flags := -X main.appVersion=`git tag --points-at HEAD` 4 | 5 | install: 6 | go install -ldflags "$(flags)" 7 | .PHONY: install 8 | 9 | build: 10 | @if [[ $$(git tag --points-at HEAD) == "" ]]; then \ 11 | echo 'need a tag to build!' ; \ 12 | exit 1 ; \ 13 | fi 14 | 15 | # windows 16 | CGO_ENABLED=1 CC=x86_64-w64-mingw32-gcc GOOS=windows GOARCH=amd64 go build -v -tags static -ldflags "-s -w" -o "tmp/codeposter_windows_amd64.exe" 17 | 18 | # mac 19 | go build -v -tags static -ldflags "-s -w" -o "tmp/codeposter_darwin_amd64" 20 | .PHONY: build 21 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/cj1128/codeposter 2 | 3 | go 1.14 4 | 5 | require ( 6 | github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect 7 | github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d // indirect 8 | github.com/go-bindata/go-bindata v3.1.2+incompatible // indirect 9 | github.com/k0kubun/pp v3.0.1+incompatible 10 | github.com/mattn/go-colorable v0.1.7 // indirect 11 | github.com/mitchellh/gox v1.0.1 // indirect 12 | github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 13 | github.com/pkg/errors v0.9.1 14 | github.com/veandco/go-sdl2 v0.4.4 15 | gopkg.in/alecthomas/kingpin.v2 v2.2.6 16 | ) 17 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Code Poster 2 | 3 | 使用 SDL 生成代码明信片，相关博客 [使用 Go 编写代码明信片生成器](http://cjting.me/golang/write-a-code-post-generator-with-go/)。 4 | 5 |

6 | rocket code poster 7 |

8 | 9 | ## 安装 10 | 11 | 因为 [go-sdl2](https://github.com/veandco/go-sdl2) 使用了 CGO，编译比较复杂，建议在 [Releases](https://github.com/cj1128/codeposter/releases) 中下载编译好的二进制程序。 12 | 13 | ### 编译 14 | 15 | 主机为 Mac，静态编译到 Mac： 16 | 17 | ```bash 18 | $ go build -v -tags static -ldflags "-s -w" 19 | ``` 20 | 21 | 交叉编译到 Windows: 22 | 23 | ```bash 24 | $ CGO_ENABLED=1 CC=x86_64-w64-mingw32-gcc GOOS=windows GOARCH=amd64 go build -v -tags static -ldflags "-s -w" 25 | ``` 26 | 27 | Linux 无法在 Mac 上进行交叉编译，在 Linux 进行编译可以参考 [go-sdl2](https://github.com/veandco/go-sdl2) 的文档说明。 28 | 29 | ## 使用 30 | 31 | ```bash 32 | $ codeposter -h 33 | usage: codeposter [] 34 | 35 | Flags: 36 | -h, --help Show context-sensitive help (also try --help-long 37 | and --help-man). 38 | --font=FONT specify font file (default: Hack-Regular.ttf bundled 39 | in binary) 40 | --font-size=12 font size 41 | --width=120 poster width in characters 42 | --height=50 poster height in characters 43 | --code-color=#e9e9e9 source code color, '#rgb' or '#rrggbb' or 44 | '#rrggbbaa' 45 | --bg-color=#fff background color, '#rgb' or '#rrggbb' or '#rrggbbaa' 46 | --img=IMG image used to render poster (default: gopher.png 47 | bundled in binary 48 | --padding=1,2 padding space in characters, e.g. 1,2 49 | -v, --version Show application version. 50 | 51 | Args: 52 | source code path 53 | ``` 54 | 55 | - `font`：字体，默认使用 [Hack-Regular.ttf](./static/Hack-Regular.ttf)，打包在二进制中 56 | - `font-size`：字体大小 57 | - `width`：明信片的宽度，单位是字符 58 | - `height`：明信片的高度，单位是字符 59 | - `code-color`: 代码的颜色，默认为 `#e9e9e9` 60 | - `bg-color`: 背景颜色，默认为 `#fff` 61 | - `img`: 渲染明信片的图片，支持 png, jpg, gif，默认为 [gopher.png](./static/gopher.png)，打包在二进制中 62 | - `padding`: 上下和左右间距，单位是字符。可以使用 `--pading 1` 设置上下和左右也可以使用 `--pading 1,2` 分别设置 63 | 64 | ## 示例 65 | 66 | ### Gopher 67 | 68 | ```bash 69 | $ codeposter examples/jquery.min.js --img examples/gopher.png 70 | ``` 71 | 72 |

73 | 74 |

75 | 76 | ### Heart 77 | 78 | ```bash 79 | $ codeposter examples/jquery.min.js --img examples/heart.png 80 | ``` 81 | 82 |

83 | 84 |

85 | 86 | ### Diamond 87 | 88 | ```bash 89 | $ codeposter examples/jquery.min.js --img examples/diamond.png 90 | ``` 91 | 92 |

93 | 94 |

95 | 96 | ## Change Log 97 | 98 | ### v0.2.0 99 | 100 | - 不再使用浏览器渲染方案，改用 SDL 渲染，直接生成图片 101 | 102 | ### v0.1.1 103 | 104 | - 处理 `jpeg` 以及 `gif` 类型的图片 105 | 106 | ### v0.1.0 107 | 108 | - 完成基本功能 109 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 h1:JYp7IbQjafoB+tBA3gMyHYHrpOtNuDiK/uB5uXxq5wM= 2 | github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= 3 | github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d h1:UQZhZ2O0vMHr2cI+DC1Mbh0TJxzA3RcLoMsFw+aXw7E= 4 | github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho= 5 | github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 6 | github.com/go-bindata/go-bindata v1.0.0 h1:DZ34txDXWn1DyWa+vQf7V9ANc2ILTtrEjtlsdJRF26M= 7 | github.com/go-bindata/go-bindata v3.1.2+incompatible h1:5vjJMVhowQdPzjE1LdxyFF7YFTXg5IgGVW4gBr5IbvE= 8 | github.com/go-bindata/go-bindata v3.1.2+incompatible/go.mod h1:xK8Dsgwmeed+BBsSy2XTopBn/8uK2HWuGSnA11C3Joo= 9 | github.com/hashicorp/go-version v1.0.0 h1:21MVWPKDphxa7ineQQTrCU5brh7OuVVAzGOCnnCPtE8= 10 | github.com/hashicorp/go-version v1.0.0/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09ZGVZPK5anwXA= 11 | github.com/k0kubun/pp v1.3.0 h1:r9td75hcmetrcVbmsZRjnxcIbI9mhm+/N6iWyG4TWe0= 12 | github.com/k0kubun/pp v3.0.1+incompatible h1:3tqvf7QgUnZ5tXO6pNAZlrvHgl6DvifjDrd9g2S9Z40= 13 | github.com/k0kubun/pp v3.0.1+incompatible/go.mod h1:GWse8YhT0p8pT4ir3ZgBbfZild3tgzSScAn6HmfYukg= 14 | github.com/mattn/go-colorable v0.1.7 h1:bQGKb3vps/j0E9GfJQ03JyhRuxsvdAanXlT9BTw3mdw= 15 | github.com/mattn/go-colorable v0.1.7/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc= 16 | github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY= 17 | github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU= 18 | github.com/mitchellh/gox v1.0.1 h1:x0jD3dcHk9a9xPSDN6YEL4xL6Qz0dvNYm8yZqui5chI= 19 | github.com/mitchellh/gox v1.0.1/go.mod h1:ED6BioOGXMswlXa2zxfh/xdd5QhwYliBFn9V18Ap4z4= 20 | github.com/mitchellh/iochan v1.0.0 h1:C+X3KsSTLFVBr/tK1eYN/vs4rJcvsiLU338UhYPJWeY= 21 | github.com/mitchellh/iochan v1.0.0/go.mod h1:JwYml1nuB7xOzsp52dPpHFffvOCDupsG0QubkSMEySY= 22 | github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 h1:zYyBkD/k9seD2A7fsi6Oo2LfFZAehjjQMERAvZLEDnQ= 23 | github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646/go.mod h1:jpp1/29i3P1S/RLdc7JQKbRpFeM1dOBd8T9ki5s+AY8= 24 | github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4= 25 | github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0= 26 | github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= 27 | github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= 28 | github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4= 29 | github.com/veandco/go-sdl2 v0.4.4 h1:coOJGftOdvNvGoUIZmm4XD+ZRQF4mg9ZVHmH3/42zFQ= 30 | github.com/veandco/go-sdl2 v0.4.4/go.mod h1:FB+kTpX9YTE+urhYiClnRzpOXbiWgaU3+5F2AB78DPg= 31 | golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 32 | golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae h1:/WDfKMnPU+m5M4xB+6x4kaepxRw6jWvR5iDRdvjHgy8= 33 | golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 34 | gopkg.in/alecthomas/kingpin.v2 v2.2.6 h1:jMFz6MfLP0/4fUyZle81rXUoxOBFi19VUFKVDOQfozc= 35 | gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw= 36 | gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 37 | gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 38 | -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "bytes" 5 | "fmt" 6 | "image" 7 | _ "image/gif" 8 | _ "image/jpeg" 9 | _ "image/png" 10 | "io" 11 | "io/ioutil" 12 | "log" 13 | "os" 14 | "path" 15 | "regexp" 16 | "strconv" 17 | "strings" 18 | 19 | "github.com/pkg/errors" 20 | 21 | "github.com/nfnt/resize" 22 | sdlimg "github.com/veandco/go-sdl2/img" 23 | "github.com/veandco/go-sdl2/sdl" 24 | "github.com/veandco/go-sdl2/ttf" 25 | "gopkg.in/alecthomas/kingpin.v2" 26 | ) 27 | 28 | // set by -ldflags 29 | var appVersion string 30 | 31 | const defaultFont = "Hack-Regular.ttf" 32 | const defaultImage = "gopher.png" 33 | 34 | var config struct { 35 | sourcePath string 36 | imgPath string 37 | fontPath string 38 | fontSize int 39 | bgColor color 40 | codeColor color 41 | padding padding 42 | width int // in chars 43 | height int // in chars 44 | } 45 | 46 | type color sdl.Color 47 | 48 | func (c *color) Set(value string) error { 49 | if !colorReg.MatchString(value) { 50 | return errInvalidColor 51 | } 52 | 53 | var r, g, b, a string 54 | 55 | if len(value) == 4 { 56 | r = value[1:2] + value[1:2] 57 | g = value[2:3] + value[2:3] 58 | b = value[3:4] + value[3:4] 59 | a = "ff" 60 | } else { 61 | r = value[1:3] 62 | g = value[3:5] 63 | b = value[5:7] 64 | a = "ff" 65 | 66 | if len(value) == 9 { 67 | a = value[7:9] 68 | } 69 | } 70 | 71 | var parsed int64 72 | 73 | parsed, _ = strconv.ParseInt(r, 16, 32) 74 | c.R = uint8(parsed) 75 | 76 | parsed, _ = strconv.ParseInt(g, 16, 32) 77 | c.G = uint8(parsed) 78 | 79 | parsed, _ = strconv.ParseInt(b, 16, 32) 80 | c.B = uint8(parsed) 81 | 82 | parsed, _ = strconv.ParseInt(a, 16, 32) 83 | c.A = uint8(parsed) 84 | 85 | return nil 86 | } 87 | 88 | func (c *color) String() string { 89 | return fmt.Sprintf("#%2x%2x%2x%2x(rgba)", c.R, c.G, c.B, c.A) 90 | } 91 | 92 | type padding struct { 93 | horizontal int 94 | vertical int 95 | } 96 | 97 | func (p *padding) Set(value string) error { 98 | parts := strings.Split(value, ",") 99 | nums := make([]int, len(parts)) 100 | 101 | for i, p := range parts { 102 | num, err := strconv.Atoi(p) 103 | if err != nil { 104 | return errors.Wrap(err, "could not parse string to integer") 105 | } 106 | nums[i] = num 107 | } 108 | 109 | if len(nums) == 1 { 110 | p.vertical = nums[0] 111 | p.horizontal = nums[0] 112 | } else if len(nums) == 2 { 113 | p.vertical = nums[0] 114 | p.horizontal = nums[1] 115 | } else { 116 | return errors.New("invalid padding value, should be x or x,x") 117 | } 118 | 119 | return nil 120 | } 121 | 122 | func (p *padding) String() string { 123 | return fmt.Sprintf("[vertical: %d, horizontal: %d]", p.vertical, p.horizontal) 124 | } 125 | 126 | var colorReg = regexp.MustCompile(`^#([0-9a-fA-F]{3}|[0-9a-fA-F]{6}|[0-9a-fA-F]{8})$`) 127 | 128 | var errInvalidColor = errors.New("color should be '#rgb' or '#rrggbb' or '#rrggbbaa'") 129 | 130 | type fontTexture struct { 131 | texture *sdl.Texture 132 | w int32 133 | h int32 134 | } 135 | 136 | type sdlContext struct { 137 | win *sdl.Window 138 | winSurface *sdl.Surface 139 | renderer *sdl.Renderer 140 | font *ttf.Font 141 | padding padding 142 | charWidth int 143 | charHeight int 144 | winWidth int 145 | winHeight int 146 | contentWidth int // without padding 147 | contentHeight int // without padding 148 | } 149 | 150 | // char: ASCII character, 0x20 ~ 0x7e inclusive 151 | func renderChar(font *ttf.Font, renderer *sdl.Renderer, char byte, color sdl.Color) (*fontTexture, error) { 152 | result := &fontTexture{} 153 | 154 | surface, err := font.RenderUTF8Blended(string(char), color) 155 | if err != nil { 156 | return nil, errors.Wrap(err, "could not render font") 157 | } 158 | 159 | texture, err := renderer.CreateTextureFromSurface(surface) 160 | if err != nil { 161 | return nil, errors.Wrap(err, "could not create texture from surface") 162 | } 163 | 164 | result.texture = texture 165 | result.w = surface.W 166 | result.h = surface.H 167 | 168 | return result, nil 169 | } 170 | 171 | func initFlags() { 172 | kingpin.Flag("font", fmt.Sprintf("specify font file (default: %s bundled in binary)", defaultFont)). 173 | StringVar(&config.fontPath) 174 | 175 | kingpin.Flag("font-size", "font size"). 176 | Default("12"). 177 | IntVar(&config.fontSize) 178 | 179 | kingpin.Flag("width", "poster width in characters"). 180 | Default("120"). 181 | IntVar(&config.width) 182 | 183 | kingpin.Flag("height", "poster height in characters"). 184 | Default("50"). 185 | IntVar(&config.height) 186 | 187 | kingpin.Flag("code-color", "source code color, '#rgb' or '#rrggbb' or '#rrggbbaa'"). 188 | Default("#e9e9e9"). 189 | SetValue(&config.codeColor) 190 | 191 | kingpin.Flag("bg-color", "background color, '#rgb' or '#rrggbb' or '#rrggbbaa'"). 192 | Default("#fff"). 193 | SetValue(&config.bgColor) 194 | 195 | kingpin.Flag("img", fmt.Sprintf("image used to render poster (default: %s bundled in binary", defaultImage)). 196 | StringVar(&config.imgPath) 197 | 198 | kingpin.Flag("padding", "padding space in characters, e.g. 1,2"). 199 | Default("1,2"). 200 | SetValue(&config.padding) 201 | 202 | kingpin.Arg("source", "source code path"). 203 | Required(). 204 | StringVar(&config.sourcePath) 205 | 206 | kingpin.Version(appVersion) 207 | kingpin.CommandLine.HelpFlag.Short('h') 208 | kingpin.CommandLine.VersionFlag.Short('v') 209 | } 210 | 211 | func fatalln(args ...interface{}) { 212 | log.Println(args...) 213 | os.Exit(1) 214 | } 215 | 216 | func main() { 217 | initFlags() 218 | 219 | if len(os.Args) == 1 { 220 | kingpin.Usage() 221 | os.Exit(0) 222 | } 223 | 224 | kingpin.Parse() 225 | 226 | // print config info 227 | { 228 | imgPath := config.imgPath 229 | if imgPath == "" { 230 | imgPath = fmt.Sprintf("builtin %s", defaultFont) 231 | } 232 | 233 | fontPath := config.fontPath 234 | if fontPath == "" { 235 | imgPath = fmt.Sprintf("builtin %s", defaultImage) 236 | } 237 | 238 | log.Printf(`Config: 239 | source path: %s 240 | img path: %s 241 | font path: %s 242 | font size: %d 243 | background color: %s 244 | code color: %s 245 | width in characters: %d 246 | height in characters: %d 247 | padding in characters: %s 248 | `, config.sourcePath, 249 | imgPath, 250 | fontPath, 251 | config.fontSize, 252 | config.bgColor.String(), 253 | config.codeColor.String(), 254 | config.width, 255 | config.height, 256 | config.padding.String(), 257 | ) 258 | } 259 | 260 | if err := run(); err != nil { 261 | log.Fatalln(err) 262 | } else { 263 | log.Println("All done 🎉") 264 | } 265 | } 266 | 267 | func readCode() ([]byte, error) { 268 | content, err := ioutil.ReadFile(config.sourcePath) 269 | if err != nil { 270 | return nil, errors.Wrap(err, "could not read source code") 271 | } 272 | 273 | // only keep ascii characters and remove whitespaces 274 | var buf bytes.Buffer 275 | 276 | for _, b := range content { 277 | if b >= 0x20 && b <= 0x7e && b != ' ' && b != '\t' && b != '\n' { 278 | buf.WriteByte(b) 279 | } 280 | } 281 | 282 | return buf.Bytes(), nil 283 | } 284 | 285 | func openAndResizeImage(contentWidth, contentHeight int) (image.Image, error) { 286 | var imgReader io.Reader 287 | 288 | if config.imgPath == "" { 289 | buf, _ := Asset(defaultImage) 290 | imgReader = bytes.NewReader(buf) 291 | } else { 292 | imgFile, err := os.Open(config.imgPath) 293 | if err != nil { 294 | return nil, errors.Wrap(err, "could not open image file") 295 | } 296 | defer imgFile.Close() 297 | 298 | imgReader = imgFile 299 | } 300 | 301 | img, _, err := image.Decode(imgReader) 302 | if err != nil { 303 | return nil, errors.Wrap(err, "could not decode image") 304 | } 305 | 306 | // resize image if necessary 307 | imgWidth := img.Bounds().Max.X 308 | imgHeight := img.Bounds().Max.Y 309 | 310 | if imgWidth > contentWidth || imgHeight > contentHeight { 311 | imgRatio := (float64)(imgWidth) / (float64)(imgHeight) 312 | winRatio := (float64)(contentWidth) / (float64)(contentHeight) 313 | if imgRatio > winRatio { 314 | img = resize.Resize(uint(contentWidth), 0, img, resize.Lanczos3) 315 | } else { 316 | img = resize.Resize(0, uint(contentHeight), img, resize.Lanczos3) 317 | } 318 | } 319 | 320 | return img, nil 321 | } 322 | 323 | func initSDLAndTTF() (*sdlContext, error) { 324 | // init sdl 325 | if err := sdl.Init(sdl.INIT_VIDEO); err != nil { 326 | return nil, errors.Wrap(err, "could not init sdl") 327 | } 328 | 329 | // init ttf 330 | if err := ttf.Init(); err != nil { 331 | return nil, errors.Wrap(err, "could not init sdl ttf") 332 | } 333 | 334 | // load default font 335 | if config.fontPath == "" { 336 | tmpFile, err := ioutil.TempFile("", "codeposter") 337 | if err != nil { 338 | return nil, errors.Wrap(err, "couldn't create temporary file") 339 | } 340 | 341 | config.fontPath = tmpFile.Name() 342 | buf, _ := Asset(defaultFont) 343 | if _, err := tmpFile.Write(buf); err != nil { 344 | return nil, errors.Wrap(err, "could not write to temporary file") 345 | } 346 | 347 | tmpFile.Close() 348 | } 349 | 350 | // open font 351 | font, err := ttf.OpenFont(config.fontPath, config.fontSize) 352 | if err != nil { 353 | return nil, errors.Wrap(err, "could not open font") 354 | } 355 | 356 | charWidth, charHeight, err := font.SizeUTF8("a") 357 | if err != nil { 358 | return nil, errors.Wrap(err, "could not get size of character") 359 | } 360 | 361 | contentWidth := charWidth * config.width 362 | contentHeight := charHeight * config.height 363 | 364 | winWidth := contentWidth + config.padding.horizontal*2*charWidth 365 | winHeight := contentHeight + config.padding.vertical*2*charHeight 366 | 367 | win, err := sdl.CreateWindow("", 0, 0, int32(winWidth), int32(winHeight), sdl.WINDOW_HIDDEN) 368 | if err != nil { 369 | return nil, errors.Wrap(err, "could not create sdl window") 370 | } 371 | 372 | winSurface, err := win.GetSurface() 373 | if err != nil { 374 | return nil, errors.Wrap(err, "could not get surface of window") 375 | } 376 | 377 | renderer, err := sdl.CreateSoftwareRenderer(winSurface) 378 | if err != nil { 379 | return nil, errors.Wrap(err, "could not create renderer from window surface") 380 | } 381 | 382 | return &sdlContext{ 383 | win: win, 384 | renderer: renderer, 385 | charWidth: charWidth, 386 | charHeight: charHeight, 387 | winWidth: winWidth, 388 | winHeight: winHeight, 389 | contentWidth: contentWidth, 390 | contentHeight: contentHeight, 391 | winSurface: winSurface, 392 | font: font, 393 | }, nil 394 | } 395 | 396 | // x, y are in pixels 397 | func getColor(img image.Image, winWidth, winHeight, x, y int) sdl.Color { 398 | // coordinates relative to image 399 | imgX := x - (winWidth-img.Bounds().Max.X)/2 400 | imgY := y - (winHeight-img.Bounds().Max.Y)/2 401 | 402 | codeColor := sdl.Color(config.codeColor) 403 | 404 | // outside of image 405 | if imgX < 0 || imgX >= img.Bounds().Max.X { 406 | return codeColor 407 | } 408 | 409 | if imgY < 0 || imgY >= img.Bounds().Max.Y { 410 | return codeColor 411 | } 412 | 413 | color := img.At(imgX, imgY) 414 | r, g, b, a := color.RGBA() 415 | 416 | // full transparent 417 | if a == 0 { 418 | return codeColor 419 | } 420 | 421 | result := sdl.Color{ 422 | R: uint8((float32)(r) / 0xffff * 0xff), 423 | G: uint8(float32(g) / 0xffff * 0xff), 424 | B: uint8(float32(b) / 0xffff * 0xff), 425 | A: uint8(float32(a) / 0xffff * 0xff), 426 | } 427 | 428 | if result == sdl.Color(config.bgColor) { 429 | result = codeColor 430 | } 431 | 432 | return result 433 | } 434 | 435 | func run() error { 436 | // init sdl 437 | sdlContext, err := initSDLAndTTF() 438 | if err != nil { 439 | return err 440 | } 441 | 442 | // read code 443 | code, err := readCode() 444 | if err != nil { 445 | return err 446 | } 447 | if len(code) == 0 { 448 | return errors.New("there is no valid characters in the source code (visible ascii characters)") 449 | } 450 | 451 | // open and resize image 452 | img, err := openAndResizeImage(int(sdlContext.contentWidth), int(sdlContext.contentHeight)) 453 | if err != nil { 454 | return err 455 | } 456 | 457 | // poll sdl events 458 | for sdl.PollEvent() != nil { 459 | } 460 | 461 | // render 462 | sdlContext.renderer.SetDrawColor(config.bgColor.R, config.bgColor.G, config.bgColor.B, config.bgColor.A) 463 | sdlContext.renderer.Clear() 464 | var dstRect sdl.Rect 465 | for cy := 0; cy < config.height; cy++ { 466 | for cx := 0; cx < config.width; cx++ { 467 | index := (cy*config.width + cx) % len(code) 468 | char := code[index] 469 | x := (cx + config.padding.horizontal) * int(sdlContext.charWidth) 470 | y := (cy + config.padding.vertical) * int(sdlContext.charHeight) 471 | 472 | centerX := x + (int)(sdlContext.charWidth)/2 473 | centerY := y + (int)(sdlContext.charHeight)/2 474 | color := getColor(img, int(sdlContext.winWidth), int(sdlContext.winHeight), centerX, centerY) 475 | 476 | t, err := renderChar(sdlContext.font, sdlContext.renderer, char, color) 477 | 478 | if err != nil { 479 | return errors.Wrap(err, "could not render string in sdl ttf") 480 | } 481 | 482 | dstRect.X = int32(x) 483 | dstRect.Y = int32(y) 484 | dstRect.W = t.w 485 | dstRect.H = t.h 486 | 487 | if err := sdlContext.renderer.Copy(t.texture, nil, &dstRect); err != nil { 488 | return errors.Wrap(err, "sdl renderer failed") 489 | } 490 | } 491 | } 492 | 493 | // output 494 | sourceBase := path.Base(config.sourcePath) 495 | outputName := sourceBase + ".png" 496 | for i := 1; fileExists(outputName); i++ { 497 | outputName = fmt.Sprintf("%s.%d.png", sourceBase, i) 498 | } 499 | 500 | if err := sdlimg.SavePNG(sdlContext.winSurface, outputName); err != nil { 501 | return errors.Wrap(err, "could not save png of sdl surface") 502 | } 503 | 504 | log.Printf("code poster generated: %s\n", outputName) 505 | 506 | return nil 507 | } 508 | 509 | 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