feat(#1): initial implementation

.editorconfig

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+root = true
+
+[*]
+indent_style = tabs
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

.gitignore

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+/bimg
+/bundle
+bin

.travis.yml

@@ -0,0 +1,7 @@
+language: go
+go:
+  - 1.4
+  - 1.3
+  - 1.2
+  - release
+  - tip

LICENSE

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+The MIT License
+
+Copyright (c) Tomas Aparicio and contributors
+
+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.

debug.go

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+package bimg
+
+import . "github.com/tj/go-debug"
+
+var debug = Debug("bimg")

image.go

@@ -1,3 +1,12 @@
 package bimg
 
-type Image struct {}
+/*
+#cgo pkg-config: vips
+#include "vips/vips.h"
+*/
+import "C"
+
+type Image struct {
+	buf   []byte
+	image *C.struct__VipsImage
+}

options.go

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+package bimg
+
+const QUALITY = 80
+
+type Gravity int
+
+type Interpolator int
+
+var interpolations = map[Interpolator]string{
+	BICUBIC:  "bicubic",
+	BILINEAR: "bilinear",
+	NOHALO:   "nohalo",
+}
+
+func (i Interpolator) String() string {
+	return interpolations[i]
+}
+
+type Options struct {
+	Height       int
+	Width        int
+	Crop         bool
+	Enlarge      bool
+	Extend       int
+	Embed        bool
+	Interpolator Interpolator
+	Gravity      Gravity
+	Quality      int
+}

resize.go

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+package bimg
+
+/*
+#cgo pkg-config: vips
+#include "vips/vips.h"
+*/
+import "C"
+
+import (
+	"math"
+)
+
+const (
+	BICUBIC Interpolator = iota
+	BILINEAR
+	NOHALO
+)
+
+func Resize(buf []byte, o Options) ([]byte, error) {
+	// detect (if possible) the file type
+
+	defer C.vips_thread_shutdown()
+
+	image, err := vipsRead(buf)
+	if err != nil {
+		return nil, err
+	}
+
+	//var tmpImage *C.struct__VipsImage
+	/*
+		// feed it
+		imageLength := C.size_t(len(buf))
+		imageBuf := unsafe.Pointer(&buf[0])
+		debug("buffer: %s", buf[0])
+
+		C.vips_jpegload_buffer_seq(imageBuf, imageLength, &image)
+	*/
+
+	// defaults
+	if o.Quality == 0 {
+		o.Quality = QUALITY
+	}
+
+	// get WxH
+	inWidth := int(image.Xsize)
+	inHeight := int(image.Ysize)
+
+	// crop
+
+	if o.Crop {
+		left, top := calculateCrop(inWidth, inHeight, o.Width, o.Height, o.Gravity)
+		o.Width = int(math.Min(float64(inWidth), float64(o.Width)))
+		o.Height = int(math.Min(float64(inHeight), float64(o.Height)))
+		image, err = vipsExtract(image, left, top, o.Width, o.Height)
+		if err != nil {
+			return nil, err
+		}
+		//err := C.vips_extract_area_0(image, &tmpImage, C.int(left), C.int(top), C.int(o.Width), C.int(o.Height))
+		//C.g_object_unref(C.gpointer(image))
+		//image = tmpImage
+	}
+
+	// rotate
+	r := Rotation{180}
+	image, err = Rotate(image, r)
+	if err != nil {
+		return nil, err
+	}
+
+	// Finally save
+	//var ptr unsafe.Pointer
+	//length := C.size_t(0)
+
+	//C.vips_jpegsave_custom(image, &ptr, &length, 1, C.int(o.Quality), 0)
+	//C.g_object_unref(C.gpointer(image))
+	//C.g_object_unref(C.gpointer(newImage))
+
+	// get back the buffer
+	//buf = C.GoBytes(ptr, C.int(length))
+	// cleanup
+	//C.g_free(C.gpointer(ptr))
+
+	buf, err = vipsSave(image, vipsSaveOptions{Quality: o.Quality})
+	if err != nil {
+		return nil, err
+	}
+	C.vips_error_clear()
+
+	return buf, nil
+}
+
+type Rotation struct {
+	angle int
+}
+
+func (a Rotation) calculate() int {
+	angle := a.angle
+	divisor := angle % 90
+	if divisor != 0 {
+		angle = a.angle - divisor
+	}
+	return angle
+}
+
+func Rotate(image *C.struct__VipsImage, r Rotation) (*C.struct__VipsImage, error) {
+	//vips := &Vips{}
+	return vipsRotate(image, r.calculate())
+}
+
+const (
+	CENTRE Gravity = iota
+	NORTH
+	EAST
+	SOUTH
+	WEST
+)
+
+func calculateCrop(inWidth, inHeight, outWidth, outHeight int, gravity Gravity) (int, int) {
+	left, top := 0, 0
+	switch gravity {
+	case NORTH:
+		left = (inWidth - outWidth + 1) / 2
+	case EAST:
+		left = inWidth - outWidth
+		top = (inHeight - outHeight + 1) / 2
+	case SOUTH:
+		left = (inWidth - outWidth + 1) / 2
+		top = inHeight - outHeight
+	case WEST:
+		top = (inHeight - outHeight + 1) / 2
+	default:
+		left = (inWidth - outWidth + 1) / 2
+		top = (inHeight - outHeight + 1) / 2
+	}
+	return left, top
+}

resize_test.go

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+package bimg
+
+import (
+	"io/ioutil"
+	"net/http"
+	"os"
+	"testing"
+)
+
+func TestResize(t *testing.T) {
+	options := Options{Width: 800, Height: 600, Crop: false}
+	img, err := os.Open("fixtures/space.jpg")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer img.Close()
+
+	buf, err := ioutil.ReadAll(img)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	newImg, err := Resize(buf, options)
+	if err != nil {
+		t.Errorf("Resize(imgData, %#v) error: %#v", options, err)
+	}
+
+	debug("Image %s", http.DetectContentType(newImg))
+
+	if http.DetectContentType(newImg) != "image/jpeg" {
+		t.Fatal("Image is not jpeg")
+	}
+
+	err = ioutil.WriteFile("fixtures/test.jpg", newImg, 0644)
+	if err != nil {
+		t.Fatal("Cannot save the image")
+	}
+}

type.go

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+package bimg
+
+type Type struct {
+	Name string
+	Mime string
+}
+
+func DetermineType(buf []byte) *Type {
+	return &Type{Name: "jpg", Mime: "image/jpg"}
+}

vips.go

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+package bimg
+
+/*
+#cgo pkg-config: vips
+#include "vips.h"
+*/
+import "C"
+
+import (
+	"errors"
+	"runtime"
+	"unsafe"
+)
+
+func init() {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	err := C.vips_init(C.CString("bimg"))
+	if err != 0 {
+		C.vips_shutdown()
+		panic("unable to start vips!")
+	}
+
+	C.vips_concurrency_set(1)                   // default
+	C.vips_cache_set_max_mem(100 * 1024 * 1024) // 100 MB
+	C.vips_cache_set_max(500)                   // 500 operations
+}
+
+type Vips struct {
+	buf []byte
+}
+
+func vipsRotate(image *C.struct__VipsImage, degrees int) (*C.struct__VipsImage, error) {
+	var out *C.struct__VipsImage
+
+	err := C.vips_rotate(image, &out, C.int(degrees))
+	C.g_object_unref(C.gpointer(image))
+	if err != 0 {
+		return nil, vipsError()
+	}
+	defer C.g_object_unref(C.gpointer(out))
+
+	return out, nil
+}
+
+func vipsRead(buf []byte) (*C.struct__VipsImage, error) {
+	var image *C.struct__VipsImage
+
+	// feed it
+	length := C.size_t(len(buf))
+	imageBuf := unsafe.Pointer(&buf[0])
+
+	err := C.vips_jpegload_buffer_seq(imageBuf, length, &image)
+	if err != 0 {
+		return nil, vipsError()
+	}
+
+	return image, nil
+}
+
+func vipsExtract(image *C.struct__VipsImage, left int, top int, width int, height int) (*C.struct__VipsImage, error) {
+	var buf *C.struct__VipsImage
+
+	err := C.vips_extract_area_0(image, &buf, C.int(left), C.int(top), C.int(width), C.int(height))
+	C.g_object_unref(C.gpointer(image))
+	if err != 0 {
+		return nil, vipsError()
+	}
+
+	return buf, nil
+}
+
+type vipsSaveOptions struct {
+	Quality int
+}
+
+func vipsSave(image *C.struct__VipsImage, o vipsSaveOptions) ([]byte, error) {
+	var ptr unsafe.Pointer
+	length := C.size_t(0)
+
+	err := C.vips_jpegsave_custom(image, &ptr, &length, 1, C.int(o.Quality), 0)
+	if err != 0 {
+		return nil, vipsError()
+	}
+	C.g_object_unref(C.gpointer(image))
+
+	buf := C.GoBytes(ptr, C.int(length))
+	// cleanup
+	C.g_free(C.gpointer(ptr))
+
+	return buf, nil
+}
+
+func vipsError() error {
+	s := C.GoString(C.vips_error_buffer())
+	C.vips_error_clear()
+	C.vips_thread_shutdown()
+	return errors.New(s)
+}