forked from davidbyttow/govips
/
header.go
286 lines (230 loc) · 6.13 KB
/
header.go
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package vips
// #include "header.h"
import "C"
import (
"strings"
"unsafe"
)
func vipsHasICCProfile(in *C.VipsImage) bool {
return int(C.has_icc_profile(in)) != 0
}
func vipsGetICCProfile(in *C.VipsImage) ([]byte, bool) {
var bufPtr unsafe.Pointer
var dataLength C.size_t
if int(C.get_icc_profile(in, &bufPtr, &dataLength)) != 0 {
return nil, false
}
buf := C.GoBytes(bufPtr, C.int(dataLength))
return buf, true
}
func vipsRemoveICCProfile(in *C.VipsImage) bool {
return fromGboolean(C.remove_icc_profile(in))
}
func vipsHasIPTC(in *C.VipsImage) bool {
return int(C.has_iptc(in)) != 0
}
func vipsImageGetFields(in *C.VipsImage) (fields []string) {
const maxFields = 256
rawFields := C.image_get_fields(in)
defer C.g_strfreev(rawFields)
cFields := (*[maxFields]*C.char)(unsafe.Pointer(rawFields))[:maxFields:maxFields]
for _, field := range cFields {
if field == nil {
break
}
fields = append(fields, C.GoString(field))
}
return
}
func vipsImageGetExifData(in *C.VipsImage) map[string]string {
fields := vipsImageGetFields(in)
exifData := map[string]string{}
for _, field := range fields {
if strings.HasPrefix(field, "exif") {
exifData[field] = vipsImageGetString(in, field)
}
}
return exifData
}
func vipsRemoveMetadata(in *C.VipsImage, keep ...string) {
fields := vipsImageGetFields(in)
retain := append(keep, technicalMetadata...)
for _, field := range fields {
if contains(retain, field) {
continue
}
cField := C.CString(field)
C.remove_field(in, cField)
C.free(unsafe.Pointer(cField))
}
}
var technicalMetadata = []string{
C.VIPS_META_ICC_NAME,
C.VIPS_META_ORIENTATION,
C.VIPS_META_N_PAGES,
C.VIPS_META_PAGE_HEIGHT,
}
func contains(a []string, x string) bool {
for _, n := range a {
if x == n {
return true
}
}
return false
}
func vipsGetMetaOrientation(in *C.VipsImage) int {
return int(C.get_meta_orientation(in))
}
func vipsRemoveMetaOrientation(in *C.VipsImage) {
C.remove_meta_orientation(in)
}
func vipsSetMetaOrientation(in *C.VipsImage, orientation int) {
C.set_meta_orientation(in, C.int(orientation))
}
func vipsGetImageNPages(in *C.VipsImage) int {
return int(C.get_image_n_pages(in))
}
func vipsSetImageNPages(in *C.VipsImage, pages int) {
C.set_image_n_pages(in, C.int(pages))
}
func vipsGetPageHeight(in *C.VipsImage) int {
return int(C.get_page_height(in))
}
func vipsSetPageHeight(in *C.VipsImage, height int) {
C.set_page_height(in, C.int(height))
}
func vipsImageGetMetaLoader(in *C.VipsImage) (string, bool) {
var out *C.char
defer freeCString(out)
code := int(C.get_meta_loader(in, &out))
return C.GoString(out), code == 0
}
func vipsImageGetDelay(in *C.VipsImage, n int) ([]int, error) {
incOpCounter("imageGetDelay")
var out *C.int
defer gFreePointer(unsafe.Pointer(out))
if err := C.get_image_delay(in, &out); err != 0 {
return nil, handleVipsError()
}
return fromCArrayInt(out, n), nil
}
func vipsImageSetDelay(in *C.VipsImage, data []C.int) error {
incOpCounter("imageSetDelay")
if n := len(data); n > 0 {
C.set_image_delay(in, &data[0], C.int(n))
}
return nil
}
// vipsDetermineImageTypeFromMetaLoader determine the image type from vips-loader metadata
func vipsDetermineImageTypeFromMetaLoader(in *C.VipsImage) ImageType {
vipsLoader, ok := vipsImageGetMetaLoader(in)
if vipsLoader == "" || !ok {
return ImageTypeUnknown
}
if strings.HasPrefix(vipsLoader, "jpeg") {
return ImageTypeJPEG
}
if strings.HasPrefix(vipsLoader, "png") {
return ImageTypePNG
}
if strings.HasPrefix(vipsLoader, "gif") {
return ImageTypeGIF
}
if strings.HasPrefix(vipsLoader, "svg") {
return ImageTypeSVG
}
if strings.HasPrefix(vipsLoader, "webp") {
return ImageTypeWEBP
}
if strings.HasPrefix(vipsLoader, "jp2k") {
return ImageTypeJP2K
}
if strings.HasPrefix(vipsLoader, "magick") {
return ImageTypeMagick
}
if strings.HasPrefix(vipsLoader, "tiff") {
return ImageTypeTIFF
}
if strings.HasPrefix(vipsLoader, "heif") {
return ImageTypeHEIF
}
if strings.HasPrefix(vipsLoader, "pdf") {
return ImageTypePDF
}
return ImageTypeUnknown
}
func vipsImageSetBlob(in *C.VipsImage, name string, data []byte) {
cData := unsafe.Pointer(&data)
cDataLength := C.size_t(len(data))
cField := C.CString(name)
defer freeCString(cField)
C.image_set_blob(in, cField, cData, cDataLength)
}
func vipsImageGetBlob(in *C.VipsImage, name string) []byte {
var bufPtr unsafe.Pointer
var dataLength C.size_t
cField := C.CString(name)
defer freeCString(cField)
if int(C.image_get_blob(in, cField, &bufPtr, &dataLength)) != 0 {
return nil
}
buf := C.GoBytes(bufPtr, C.int(dataLength))
return buf
}
func vipsImageSetDouble(in *C.VipsImage, name string, f float64) {
cField := C.CString(name)
defer freeCString(cField)
cDouble := C.double(f)
C.image_set_double(in, cField, cDouble)
}
func vipsImageGetDouble(in *C.VipsImage, name string) float64 {
cField := C.CString(name)
defer freeCString(cField)
var cDouble C.double
if int(C.image_get_double(in, cField, &cDouble)) == 0 {
return float64(cDouble)
}
return 0
}
func vipsImageSetInt(in *C.VipsImage, name string, i int) {
cField := C.CString(name)
defer freeCString(cField)
cInt := C.int(i)
C.image_set_int(in, cField, cInt)
}
func vipsImageGetInt(in *C.VipsImage, name string) int {
cField := C.CString(name)
defer freeCString(cField)
var cInt C.int
if int(C.image_get_int(in, cField, &cInt)) == 0 {
return int(cInt)
}
return 0
}
func vipsImageSetString(in *C.VipsImage, name string, str string) {
cField := C.CString(name)
defer freeCString(cField)
cStr := C.CString(str)
defer freeCString(cStr)
C.image_set_string(in, cField, cStr)
}
func vipsImageGetString(in *C.VipsImage, name string) string {
cField := C.CString(name)
defer freeCString(cField)
var cFieldValue *C.char
defer freeCString(cFieldValue)
if int(C.image_get_string(in, cField, &cFieldValue)) == 0 {
return C.GoString(cFieldValue)
}
return ""
}
func vipsImageGetAsString(in *C.VipsImage, name string) string {
cField := C.CString(name)
defer freeCString(cField)
var cFieldValue *C.char
defer freeCString(cFieldValue)
if int(C.image_get_as_string(in, cField, &cFieldValue)) == 0 {
return C.GoString(cFieldValue)
}
return ""
}