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feat(#60): support zero top and left params in extract operation

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This commit is contained in:
Tomas Aparicio 2015-10-12 21:36:37 +01:00
parent 89292e7ead
commit b7eaa00f10
4 changed files with 26 additions and 1 deletions
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6
vips.go
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@ -8,6 +8,7 @@ import "C"
import (
"errors"
"math"
"os"
"runtime"
"strings"
@ -340,6 +341,10 @@ func vipsSave(image *C.VipsImage, o vipsSaveOptions) ([]byte, error) {
return buf, nil
}
func max(x int) int {
return int(math.Max(float64(x), 0))
}
func vipsExtract(image *C.VipsImage, left, top, width, height int) (*C.VipsImage, error) {
var buf *C.VipsImage
defer C.g_object_unref(C.gpointer(image))
@ -348,6 +353,7 @@ func vipsExtract(image *C.VipsImage, left, top, width, height int) (*C.VipsImage
return nil, errors.New("Maximum image size exceeded")
}
top, left = max(top), max(left)
err := C.vips_extract_area_bridge(image, &buf, C.int(left), C.int(top), C.int(width), C.int(height))
if err != 0 {
return nil, catchVipsError()