Since AVIF computation was awfully slow, this exposes the CPU effort setting "speed".

.travis.yml

@@ -12,6 +12,7 @@ env:
   # - LIBVIPS=8.8.4
   # - LIBVIPS=8.9.2
   - LIBVIPS=8.10.1
+  - LIBVIPS=8.10.2
 
 matrix:
   allow_failures:

options.go

@@ -226,6 +226,8 @@ type Options struct {
 	OutputICC      string
 	InputICC       string
 	Palette        bool
+	// Speed defines the AVIF encoders CPU effort.
+	Speed          int
 
 	// private fields
 	autoRotateOnly bool

resizer.go

@@ -187,6 +187,7 @@ func saveImage(image *C.VipsImage, o Options) ([]byte, error) {
 		StripMetadata:  o.StripMetadata,
 		Lossless:       o.Lossless,
 		Palette:        o.Palette,
+		Speed:          o.Speed,
 	}
 	// Finally get the resultant buffer
 	return vipsSave(image, saveOptions)

vips.go

@@ -45,6 +45,7 @@ type VipsMemoryInfo struct {
 
 // vipsSaveOptions represents the internal option used to talk with libvips.
 type vipsSaveOptions struct {
+	Speed          int
 	Quality        int
 	Compression    int
 	Type           ImageType
@@ -493,6 +494,7 @@ func vipsSave(image *C.VipsImage, o vipsSaveOptions) ([]byte, error) {
 	strip := C.int(boolToInt(o.StripMetadata))
 	lossless := C.int(boolToInt(o.Lossless))
 	palette := C.int(boolToInt(o.Palette))
+	speed := C.int(o.Speed)
 
 	if o.Type != 0 && !IsTypeSupportedSave(o.Type) {
 		return nil, fmt.Errorf("VIPS cannot save to %#v", ImageTypes[o.Type])
@@ -508,7 +510,7 @@ func vipsSave(image *C.VipsImage, o vipsSaveOptions) ([]byte, error) {
 	case HEIF:
 		saveErr = C.vips_heifsave_bridge(tmpImage, &ptr, &length, strip, quality, lossless)
 	case AVIF:
-		saveErr = C.vips_avifsave_bridge(tmpImage, &ptr, &length, strip, quality, lossless)
+		saveErr = C.vips_avifsave_bridge(tmpImage, &ptr, &length, strip, quality, lossless, speed)
 	default:
 		saveErr = C.vips_jpegsave_bridge(tmpImage, &ptr, &length, strip, quality, interlace)
 	}

vips.h

@@ -369,8 +369,17 @@ vips_tiffsave_bridge(VipsImage *in, void **buf, size_t *len) {
 }
 
 int
-vips_avifsave_bridge(VipsImage *in, void **buf, size_t *len, int strip, int quality, int lossless) {
-#if (VIPS_MAJOR_VERSION > 8 || (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION >= 9))
+vips_avifsave_bridge(VipsImage *in, void **buf, size_t *len, int strip, int quality, int lossless, int speed) {
+#if (VIPS_MAJOR_VERSION > 8 || (VIPS_MAJOR_VERSION >= 8 && VIPS_MINOR_VERSION > 10) || (VIPS_MAJOR_VERSION >= 8 && VIPS_MINOR_VERSION >= 10 && VIPS_MICRO_VERSION >= 2))
+    return vips_heifsave_buffer(in, buf, len,
+    "strip", INT_TO_GBOOLEAN(strip),
+    "Q", quality,
+    "lossless", INT_TO_GBOOLEAN(lossless),
+    "compression", VIPS_FOREIGN_HEIF_COMPRESSION_AV1,
+    "speed", speed,
+    NULL
+    );
+#elif (VIPS_MAJOR_VERSION > 8 || (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION >= 9))
     return vips_heifsave_buffer(in, buf, len,
     "strip", INT_TO_GBOOLEAN(strip),
     "Q", quality,

vips_test.go

@@ -33,7 +33,7 @@ func TestVipsSave(t *testing.T) {
 
 	for _, typ := range types {
 		image, _, _ := vipsRead(readImage("test.jpg"))
-		options := vipsSaveOptions{Quality: 95, Type: typ, StripMetadata: true}
+		options := vipsSaveOptions{Quality: 95, Type: typ, StripMetadata: true, Speed: 8}
 
 		buf, err := vipsSave(image, options)
 		if err != nil {