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78 lines
1.8 KiB
78 lines
1.8 KiB
package bimg
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/*
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#cgo pkg-config: vips
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#include "vips/vips.h"
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*/
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import "C"
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// ImageSize represents the image width and height values
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type ImageSize struct {
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Width int
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Height int
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}
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// ImageMetadata represents the basic metadata fields
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type ImageMetadata struct {
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Orientation int
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Channels int
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Alpha bool
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Profile bool
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Type string
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Space string
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Colourspace string
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Size ImageSize
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}
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// Size returns the image size by width and height pixels.
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func Size(buf []byte) (ImageSize, error) {
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metadata, err := Metadata(buf)
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if err != nil {
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return ImageSize{}, err
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}
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return ImageSize{
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Width: int(metadata.Size.Width),
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Height: int(metadata.Size.Height),
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}, nil
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}
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// ColourspaceIsSupported checks if the image colourspace is supported by libvips.
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func ColourspaceIsSupported(buf []byte) (bool, error) {
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return vipsColourspaceIsSupportedBuffer(buf)
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}
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// ImageInterpretation returns the image interpretation type.
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// See: http://www.vips.ecs.soton.ac.uk/supported/current/doc/html/libvips/VipsImage.html#VipsInterpretation
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func ImageInterpretation(buf []byte) (Interpretation, error) {
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return vipsInterpretationBuffer(buf)
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}
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// Metadata returns the image metadata (size, type, alpha channel, profile, EXIF orientation...).
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func Metadata(buf []byte) (ImageMetadata, error) {
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defer C.vips_thread_shutdown()
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image, imageType, err := vipsRead(buf)
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if err != nil {
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return ImageMetadata{}, err
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}
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defer C.g_object_unref(C.gpointer(image))
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size := ImageSize{
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Width: int(image.Xsize),
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Height: int(image.Ysize),
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}
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metadata := ImageMetadata{
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Size: size,
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Channels: int(image.Bands),
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Orientation: vipsExifOrientation(image),
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Alpha: vipsHasAlpha(image),
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Profile: vipsHasProfile(image),
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Space: vipsSpace(image),
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Type: ImageTypeName(imageType),
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}
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return metadata, nil
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}
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