feautre/exr added support for exr type

Author: prOOrc

testdata/test.exr

@@ -32,6 +32,8 @@ const (
 	HEIF
 	// AVIF represents the AVIF image type.
 	AVIF
+	// EXR represents the EXR image type.
+	EXR
 )
 
 var (
@@ -51,6 +53,7 @@ var ImageTypes = map[ImageType]string{
 	MAGICK: "magick",
 	HEIF:   "heif",
 	AVIF:   "avif",
+	EXR:    "exr",
 }
 
 // imageMutex is used to provide thread-safe synchronization

type.go

@@ -23,6 +23,7 @@ func TestDeterminateImageType(t *testing.T) {
 		{"test2.heic", HEIF},
 		{"test3.heic", HEIF},
 		{"test.avif", AVIF},
+		{"test.exr", EXR},
 	}
 
 	for _, file := range files {
@@ -53,6 +54,7 @@ func TestDeterminateImageTypeName(t *testing.T) {
 		// {"test.jp2", "magick"},
 		{"test.heic", "heif"},
 		{"test.avif", "avif"},
+		{"test.exr", "exr"},
 	}
 
 	for _, file := range files {
@@ -106,6 +108,7 @@ func TestIsTypeNameSupported(t *testing.T) {
 		{"pdf", true},
 		{"heif", true},
 		{"avif", true},
+		{"exr", true},
 	}
 
 	for _, n := range types {

type_test.go

@@ -205,6 +205,9 @@ func VipsIsTypeSupported(t ImageType) bool {
 	if t == AVIF {
 		return int(C.vips_type_find_bridge(C.HEIF)) != 0
 	}
+	if t == EXR {
+		return int(C.vips_type_find_bridge(C.MAGICK)) != 0
+	}
 	return false
 }
 
@@ -767,6 +770,10 @@ func vipsImageType(buf []byte) ImageType {
 		buf[8] == 0x61 && buf[9] == 0x76 && buf[10] == 0x69 && buf[11] == 0x66 {
 		return AVIF
 	}
+	if IsTypeSupported(EXR) && buf[0] == 0x76 && buf[1] == 0x2f &&
+		buf[2] == 0x31 && buf[3] == 0x01 {
+		return EXR
+	}
 
 	return UNKNOWN
 }