first commit

.github/dependabot.yml

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+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "gomod" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"

.github/workflows/coverage.yml

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+name: Test Coverage
+run-name: Test Coverage
+
+on:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Setup Go 1.21
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.21
+
+      - name: Generate Test Coverage
+        run: go test ./... -coverprofile=./cover.out
+
+      - name: Check Test Coverage
+        id: coverage
+        uses: vladopajic/go-test-coverage@v2
+        with:
+          config: ./.testcoverage.yml
+
+      - name: Make Coverage Badge
+        uses: action-badges/[email protected]
+        if: contains(github.ref, 'master')
+        with:
+          label: coverage
+          message: ${{ steps.coverage.outputs.badge-text }}
+          message-color: ${{ steps.coverage.outputs.badge-color }}
+          file-name: coverage.svg
+          badge-branch: badges ## orphan branch where badge will be committed
+          github-token: "${{ secrets.GH_PAT }}"

.github/workflows/security-check.yml

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+name: "Security Check"
+
+on:
+  pull_request:
+    branches:
+      - master
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    env:
+      GO111MODULE: on
+    steps:
+      - name: Checkout Source
+        uses: actions/checkout@v3
+      - name: Run Gosec Security Scanner
+        uses: securego/gosec@master
+        with:
+          args: './...'

.gitignore

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+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+vendor/
+
+# Go workspace file
+go.work
+
+# Build output
+build/
+dist/
+
+# IDE files
+.idea/
+.vscode/

.testcoverage.yml

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+profile: cover.out
+local-prefix: "github.com/ryanbekhen/go-webp"
+threshold:
+  file: 60
+  package: 80
+  total: 80
+exclude:
+  paths:
+    - \.pb\.go$    # excludes all protobuf generated files

LICENSE

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+MIT License
+
+Copyright (c) 2024 Achmad Irianto Eka Putra
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# GO WebP
+
+This is a simple library Go to convert images to WebP format using the [libwebp](https://developers.google.com/speed/webp/docs/api) library.
+
+## Development Requirements
+
+- Go 1.22
+- libwebp-dev
+
+Before running the project, you need to install the libwebp-dev package. You can install it by running the following command:
+
+```bash
+# Ubuntu
+sudo apt-get install libwebp-dev
+```
+
+## Installation
+
+To install the library, you need to run the following command:
+
+```bash
+go get github.com/ryanbekhen/go-webp
+```
+
+## Usage
+
+To use the library, you need to run the following command:
+
+```go
+package main
+
+import (
+	"github.com/ryanbekhen/go-webp"
+	"image"
+	_ "image/jpeg"
+	_ "image/png"
+	"os"
+)
+
+func main() {
+	input := "img.png"
+	output := "img.webp"
+
+	// Open the input image file.
+	imgFile, err := os.Open(input)
+	if err != nil {
+		panic(err)
+	}
+	defer imgFile.Close()
+
+	// Decode the input image file.
+	img, _, err := image.Decode(imgFile)
+	if err != nil {
+		panic(err)
+	}
+
+	// Create the output image file.
+	outFile, err := os.Create(output)
+	if err != nil {
+		panic(err)
+	}
+	defer outFile.Close()
+
+	// Encode the input image file.
+	err = webp.Encode(img, 75, outFile)
+	if err != nil {
+		panic(err)
+	}
+}
+```
+
+> Note: The quality parameter is a number between 0 and 100.
+> import _ "image/jpeg" and import _ "image/png" are required to decode the input image file.
+
+## Contributing
+
+Contributions are welcome! For feature requests and bug reports please [submit an issue](https://github.com/ryanbekhen/go-webp/issues).
+
+## License
+
+This project is licensed under the [MIT License](LICENSE).

go.mod

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+module github.com/ryanbekhen/go-webp
+
+go 1.22

webp.go

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+package webp
+
+/*
+#cgo LDFLAGS: -lwebp
+#include <stdlib.h>
+#include <webp/encode.h>
+
+int encodeWebP(uint8_t* img, int width, int height, int stride, float quality_factor, uint8_t** output, size_t* output_size) {
+    WebPConfig config;
+    if (!WebPConfigInit(&config)) {
+        return 0;
+    }
+    config.quality = quality_factor;
+    if (!WebPValidateConfig(&config)) {
+        return 0;
+    }
+    *output_size = WebPEncodeRGBA(img, width, height, stride, quality_factor, output);
+    return 1;
+}
+*/
+import "C"
+import (
+	"errors"
+	"image"
+	"io"
+	"unsafe"
+)
+
+// Encode encodes the input image in the WebP format with the specified quality and writes it to the given destination writer.
+// The function converts the image into a byte slice and calls a C function to perform the encoding.
+// The resulting encoded data is written to the destination writer.
+// If there are any errors during the encoding or writing process, an error is returned.
+// Note: The C function is not included in this code snippet, it must be implemented separately.
+// Example usage:
+//
+//	err := webp.Encode(img, 75, w)
+//	if err != nil {
+//	    log.Fatal(err)
+//	}
+func Encode(img image.Image, quality float32, dest io.Writer) error {
+	if img == nil {
+		return errors.New("img must not be nil")
+	}
+
+	bounds := img.Bounds()
+	width, height := bounds.Dx(), bounds.Dy()
+
+	output := make([]byte, 4*width*height)
+	for y := 0; y < height; y++ {
+		for x := 0; x < width; x++ {
+			r, g, b, a := img.At(x, y).RGBA()
+			index := y*width*4 + x*4
+			output[index+0] = byte(r >> 8)
+			output[index+1] = byte(g >> 8)
+			output[index+2] = byte(b >> 8)
+			output[index+3] = byte(a >> 8)
+		}
+	}
+
+	// Convert the go byte slice to c array.
+	cArray := (*C.uint8_t)(C.CBytes(output))
+	defer C.free(unsafe.Pointer(cArray))
+
+	var outputSize C.size_t
+	result := C.encodeWebP(cArray, C.int(width), C.int(height), C.int(width*4), C.float(quality), &cArray, &outputSize)
+
+	if result == 0 {
+		return errors.New("failed to encode image to webp")
+	}
+
+	// Get the bytes, don't forget to free it after getting the bytes.
+	encodedData := C.GoBytes(unsafe.Pointer(cArray), C.int(outputSize))
+	C.free(unsafe.Pointer(cArray))
+
+	_, err := dest.Write(encodedData)
+	if err != nil {
+		return errors.New("failed to write encoded data")
+	}
+
+	return nil
+}

webp_test.go

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+package webp
+
+import (
+	"bytes"
+	"image"
+	"image/color"
+	"testing"
+)
+
+func TestEncode(t *testing.T) {
+	tests := []struct {
+		name    string
+		img     image.Image
+		quality float32
+	}{
+		{
+			name:    "empty image",
+			img:     image.NewRGBA(image.Rect(0, 0, 0, 0)),
+			quality: float32(75.0),
+		},
+		{
+			name:    "small image",
+			img:     image.NewRGBA(image.Rect(0, 0, 2, 2)),
+			quality: float32(75.0),
+		},
+		{
+			name:    "large image",
+			img:     randomImage(500, 500),
+			quality: float32(75.0),
+		},
+		{
+			name:    "high quality",
+			img:     randomImage(100, 100),
+			quality: float32(100.0),
+		},
+		{
+			name:    "low quality",
+			img:     randomImage(100, 100),
+			quality: float32(10.0),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			buf := &bytes.Buffer{}
+			err := Encode(tt.img, tt.quality, buf)
+			if err != nil {
+				t.Fatalf("Encode() error = %v, wantErr = %v", err, false)
+			}
+		})
+	}
+}
+
+func TestEncode_EmptyImage(t *testing.T) {
+	tests := []struct {
+		name    string
+		img     image.Image
+		quality float32
+	}{
+		{
+			name:    "nil image",
+			img:     nil,
+			quality: float32(75.0),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			buf := &bytes.Buffer{}
+			err := Encode(tt.img, tt.quality, buf)
+			if err == nil {
+				t.Fatalf("Encode() error = %v, wantErr = %v", err, true)
+			}
+		})
+	}
+}
+
+// This function generates an image with random colors
+func randomImage(width, height int) *image.RGBA {
+	img := image.NewRGBA(image.Rect(0, 0, width, height))
+	for y := 0; y < height; y++ {
+		for x := 0; x < width; x++ {
+			img.Set(x, y, color.RGBA{R: uint8(x % 256), G: uint8(y % 256), B: uint8((x + y) % 256), A: 255})
+		}
+	}
+	return img
+}