Beispiel #1
0
func crop(mw *imagick.MagickWand, geo btcdn.GeoBox) (err error) {
	offsetX, offsetY, err := calculateGravityOffsets(int(mw.GetImageWidth()), int(mw.GetImageHeight()), geo)
	if err != nil {
		return
	}
	err = mw.CropImage(uint(geo.Width()), uint(geo.Height()), offsetX, offsetY)
	if err != nil {
		return
	}

	return
}
Beispiel #2
0
func calculateGravityOffsets(baseWidth int, baseHeight int, geo btcdn.GeoBox) (offsetX int, offsetY int, err error) {

	cropWidth := geo.Width()
	cropHeight := geo.Height()

	if cropWidth > baseWidth {
		cropWidth = baseWidth
	}

	if cropHeight > cropHeight {
		cropHeight = baseHeight
	}

	switch geo.Gravity() {
	case "":
		offsetX = geo.Offset()[0]
		offsetY = geo.Offset()[1]
	case "c":
		offsetX = (baseWidth - cropWidth) / 2
		offsetY = (baseHeight - cropHeight) / 2
	case "n":
		offsetX = (baseWidth - cropWidth) / 2
		offsetY = 0
	case "nw":
		offsetX = 0
		offsetY = 0
	case "ne":
		offsetX = baseWidth - cropWidth
		offsetY = 0
	case "s":
		offsetX = (baseWidth - cropWidth) / 2
		offsetY = baseHeight - cropHeight
	case "sw":
		offsetX = 0
		offsetY = baseHeight - cropHeight
	case "se":
		offsetX = baseWidth - cropWidth
		offsetY = baseHeight - cropHeight
	case "w":
		offsetX = 0
		offsetY = (baseHeight - cropHeight) / 2
	case "e":
		offsetX = baseWidth - cropWidth
		offsetY = (baseHeight - cropHeight) / 2
	}

	return
}
Beispiel #3
0
func (pr *BimgProcessor) Process(buffer []byte, geo btcdn.GeoBox) (img btcdn.Image, err error) {

	bimgImg := bimg.NewImage(buffer)

	var newImage []byte

	gravity := resolveGravity(geo.Gravity())

	if geo.Cropped() && geo.Resized() {
		newImage, err = resizeAndCrop(bimgImg, geo.Width(), geo.Height(), gravity)
	} else if geo.Resized() {
		if geo.Mode() == "!" {
			newImage, err = forceResize(bimgImg, geo.Width(), geo.Height())
		} else {
			newImage, err = resize(bimgImg, geo.Width())
		}
	} else if geo.Cropped() {
		newImage, err = crop(bimgImg, int(float64(geo.Offset()[1])), int(float64(geo.Offset()[0])), geo.Width(), geo.Height())
	}

	if geo.Greyscale() {
		newImage, err = bimgImg.Colourspace(bimg.INTERPRETATION_B_W)
	}

	img = &Image{
		body: newImage,
		mime: Mimes[bimgImg.Type()],
	}

	return
}
Beispiel #4
0
func resize(mw *imagick.MagickWand, geo btcdn.GeoBox) (err error) {
	var height uint
	width := geo.Width()
	baseWidth := int(mw.GetImageWidth())
	if width > baseWidth {
		width = baseWidth
	}

	if geo.Mode() == "!" {
		height = uint(geo.Height())
	} else {
		ratio := heightToWidthRatio(mw)
		height = uint((float64)(width) * ratio)
	}

	err = mw.ResizeImage(uint(width), height, imagick.FILTER_LANCZOS, 1)
	if err != nil {
		return
	}

	return
}