func vipsSave(image *C.VipsImage, o vipsSaveOptions) ([]byte, error) {
defer C.g_object_unref(C.gpointer(image))
tmpImage, err := vipsPreSave(image, &o)
if err != nil {
return nil, err
}
// When an image has an unsupported color space, vipsPreSave
// returns the pointer of the image passed to it unmodified.
// When this occurs, we must take care to not dereference the
// original image a second time; we may otherwise erroneously
// free the object twice.
if tmpImage != image {
defer C.g_object_unref(C.gpointer(tmpImage))
}
length := C.size_t(0)
saveErr := C.int(0)
interlace := C.int(boolToInt(o.Interlace))
quality := C.int(o.Quality)
var ptr unsafe.Pointer
switch o.Type {
case WEBP:
saveErr = C.vips_webpsave_bridge(tmpImage, &ptr, &length, 1, quality)
break
case PNG:
saveErr = C.vips_pngsave_bridge(tmpImage, &ptr, &length, 1, C.int(o.Compression), quality, interlace)
break
case GIF:
return nil, errors.New("VIPS cannot save to GIF")
case PDF:
return nil, errors.New("VIPS cannot save to PDF")
case SVG:
return nil, errors.New("VIPS cannot save to SVG")
default:
saveErr = C.vips_jpegsave_bridge(tmpImage, &ptr, &length, 1, quality, interlace)
break
}
if int(saveErr) != 0 {
return nil, catchVipsError()
}
buf := C.GoBytes(ptr, C.int(length))
// Clean up
C.g_free(C.gpointer(ptr))
C.vips_error_clear()
return buf, nil
}
func vipsPreSave(image *C.VipsImage, o *vipsSaveOptions) (*C.VipsImage, error) {
// Remove ICC profile metadata
if o.NoProfile {
C.remove_profile(image)
}
// Use a default interpretation and cast it to C type
if o.Interpretation == 0 {
o.Interpretation = INTERPRETATION_sRGB
}
interpretation := C.VipsInterpretation(o.Interpretation)
// Apply the proper colour space
var outImage *C.VipsImage
if vipsColourspaceIsSupported(image) {
err := int(C.vips_colourspace_bridge(image, &outImage, interpretation))
if err != 0 {
return nil, catchVipsError()
}
C.g_object_unref(C.gpointer(image))
image = outImage
}
return image, nil
}
func affineImage(image *C.struct__VipsImage, o Options, residual float64) (*C.struct__VipsImage, error) {
newImage, err := vipsAffine(image, residual, o.Interpolator)
if err != nil {
C.g_object_unref(C.gpointer(image))
return nil, err
}
if o.Enlarge || (o.Width > int(newImage.Xsize) && o.Height > int(newImage.Ysize)) {
C.g_object_unref(C.gpointer(image))
image = newImage
} else {
C.g_object_unref(C.gpointer(newImage))
}
return image, nil
}
func vipsAffine(input *C.VipsImage, residualx, residualy float64, i Interpolator) (*C.VipsImage, error) {
var image *C.VipsImage
cstring := C.CString(i.String())
interpolator := C.vips_interpolate_new(cstring)
defer C.free(unsafe.Pointer(cstring))
defer C.g_object_unref(C.gpointer(input))
defer C.g_object_unref(C.gpointer(interpolator))
err := C.vips_affine_interpolator(input, &image, C.double(residualx), 0, 0, C.double(residualy), interpolator)
if err != 0 {
return nil, catchVipsError()
}
return image, nil
}
func (t *PDFStreamTextObject) WriteAt(text string, props TypesettingProps, x float64, y float64) error {
var layout *C.PangoLayout
var font_description *C.PangoFontDescription
font_description = C.pango_font_description_new()
cfontname := C.CString(props.Fontname)
defer C.free(unsafe.Pointer(cfontname))
C.pango_font_description_set_family(font_description, cfontname)
C.pango_font_description_set_weight(font_description, C.PANGO_WEIGHT_NORMAL)
C.pango_font_description_set_absolute_size(font_description, C.double(props.Fontsize)*C.PANGO_SCALE)
layout = C.pango_cairo_create_layout(t.context)
C.pango_layout_set_font_description(layout, font_description)
width := props.PageWidth - props.LeftMargin - props.RightMargin
fmt.Printf("width is %f\n", width)
C.pango_layout_set_width(layout, C.int(width*C.PANGO_SCALE))
C.pango_layout_set_justify(layout, C.TRUE)
ctext := C.CString(text)
defer C.free(unsafe.Pointer(ctext))
C.pango_layout_set_text(layout, ctext, -1)
C.cairo_set_source_rgb(t.context, 0.0, 0.0, 0.0)
C.cairo_move_to(t.context, C.double(x), C.double(y))
skip := props.Baselineskip
nlines := int(C.pango_layout_get_line_count(layout))
for i := 0; i < nlines; i++ {
C.cairo_move_to(t.context, C.double(x), C.double(y+float64(i)*skip))
C.pango_cairo_show_layout_line(t.context, C.pango_layout_get_line(layout, C.int(i)))
}
C.g_object_unref(C.gpointer(layout))
C.pango_font_description_free(font_description)
return nil
}
//--------------------------------------------------------------
// Object
//--------------------------------------------------------------
func objectFinalizer(obj *Object) {
if FQueue.Push(unsafe.Pointer(obj), objectFinalizer2) {
return
}
C.g_object_set_qdata((*C.GObject)(obj.C), C.GQuark(go_repr), nil)
C.g_object_unref(C.gpointer(obj.C))
}
// Metadata returns the image metadata (size, type, alpha channel, profile, EXIF orientation...).
func Metadata(buf []byte) (ImageMetadata, error) {
defer C.vips_thread_shutdown()
image, imageType, err := vipsRead(buf)
if err != nil {
return ImageMetadata{}, err
}
defer C.g_object_unref(C.gpointer(image))
size := ImageSize{
Width: int(image.Xsize),
Height: int(image.Ysize),
}
metadata := ImageMetadata{
Size: size,
Channels: int(image.Bands),
Orientation: vipsExifOrientation(image),
Alpha: vipsHasAlpha(image),
Profile: vipsHasProfile(image),
Space: vipsSpace(image),
Type: ImageTypeName(imageType),
}
return metadata, nil
}
// imageError adapts image modification semantics from being the VIPS-style
// chain of immutable objects that we need to individually free to a single
// stateful Go object that can be closed once, greatly simplifying error
// handling.
func (in *Image) imageError(out *C.struct__VipsImage, e C.int) error {
if in.vi == nil {
panic("Input image is nil")
}
if err := vipsError(e); err != nil {
if out != nil {
C.g_object_unref(C.gpointer(out))
}
return err
}
C.g_object_unref(C.gpointer(in.vi))
in.vi = out
return nil
}
func vipsColourspaceIsSupportedBuffer(buf []byte) (bool, error) {
image, _, err := vipsRead(buf)
if err != nil {
return false, err
}
C.g_object_unref(C.gpointer(image))
return vipsColourspaceIsSupported(image), nil
}
func vipsInterpretationBuffer(buf []byte) (Interpretation, error) {
image, _, err := vipsRead(buf)
if err != nil {
return INTERPRETATION_ERROR, err
}
C.g_object_unref(C.gpointer(image))
return vipsInterpretation(image), nil
}
func vipsGaussianBlur(image *C.VipsImage, o GaussianBlur) (*C.VipsImage, error) {
var out *C.VipsImage
defer C.g_object_unref(C.gpointer(image))
err := C.vips_gaussblur_bridge(image, &out, C.double(o.Sigma), C.double(o.MinAmpl))
if err != 0 {
return nil, catchVipsError()
}
return out, nil
}
func vipsSharpen(image *C.VipsImage, o Sharpen) (*C.VipsImage, error) {
var out *C.VipsImage
defer C.g_object_unref(C.gpointer(image))
err := C.vips_sharpen_bridge(image, &out, C.int(o.Radius), C.double(o.X1), C.double(o.Y2), C.double(o.Y3), C.double(o.M1), C.double(o.M2))
if err != 0 {
return nil, catchVipsError()
}
return out, nil
}
func vipsSave(image *C.struct__VipsImage, o vipsSaveOptions) ([]byte, error) {
length := C.size_t(0)
err := C.int(0)
interlace := C.int(boolToInt(o.Interlace))
// Remove ICC profile metadata
if o.NoProfile {
C.remove_profile(image)
}
// Force RGB color space
var outImage *C.struct__VipsImage
C.vips_colourspace_bridge(image, &outImage)
defer C.g_object_unref(C.gpointer(image))
defer C.g_object_unref(C.gpointer(outImage))
var ptr unsafe.Pointer
switch o.Type {
case PNG:
err = C.vips_pngsave_bridge(outImage, &ptr, &length, 1, C.int(o.Compression), C.int(o.Quality), interlace)
break
case WEBP:
err = C.vips_webpsave_bridge(outImage, &ptr, &length, 1, C.int(o.Quality))
break
default:
err = C.vips_jpegsave_bridge(outImage, &ptr, &length, 1, C.int(o.Quality), interlace)
break
}
if int(err) != 0 {
return nil, catchVipsError()
}
buf := C.GoBytes(ptr, C.int(length))
// Clean up
C.g_free(C.gpointer(ptr))
C.vips_error_clear()
return buf, nil
}
func NewParamSpecFromCPointer(p unsafe.Pointer) *ParamSpec {
ret := &ParamSpec{
NewTraitParamSpec(p),
p,
}
C.g_object_ref_sink(C.gpointer(p))
runtime.SetFinalizer(ret, func(p *ParamSpec) {
C.g_object_unref(C.gpointer(unsafe.Pointer(p.CPointer)))
})
return ret
}
func NewObjectFromCPointer(p unsafe.Pointer) *Object {
ret := &Object{
NewTraitObject(p),
p,
}
C.g_object_ref_sink(C.gpointer(p))
runtime.SetFinalizer(ret, func(p *Object) {
C.g_object_unref(C.gpointer(unsafe.Pointer(p.CPointer)))
})
return ret
}
func NewAppLaunchContextFromCPointer(p unsafe.Pointer) *AppLaunchContext {
ret := &AppLaunchContext{
NewTraitAppLaunchContext(p),
p,
}
C.g_object_ref_sink(C.gpointer(p))
runtime.SetFinalizer(ret, func(p *AppLaunchContext) {
C.g_object_unref(C.gpointer(unsafe.Pointer(p.CPointer)))
})
return ret
}
func (d *dialog) cleanup(box *C.GtkWidget) {
// have to explicitly close the dialog box, otherwise wacky things will happen
C.gtk_widget_destroy(box)
if d.parent != dialogWindow {
C.gtk_window_group_remove_window(d.newgroup, d.pwin)
C.g_object_unref(C.gpointer(unsafe.Pointer(d.newgroup))) // free the group
if d.prevgroup != nil {
C.gtk_window_group_add_window(d.prevgroup, d.pwin)
} // otherwise it'll go back into the default group on its own
}
}
func vipsEmbed(input *C.VipsImage, left, top, width, height, extend int) (*C.VipsImage, error) {
var image *C.VipsImage
defer C.g_object_unref(C.gpointer(input))
err := C.vips_embed_bridge(input, &image, C.int(left), C.int(top), C.int(width), C.int(height), C.int(extend))
if err != 0 {
return nil, catchVipsError()
}
return image, nil
}
func vipsZoom(image *C.VipsImage, zoom int) (*C.VipsImage, error) {
var out *C.VipsImage
defer C.g_object_unref(C.gpointer(image))
err := C.vips_zoom_bridge(image, &out, C.int(zoom), C.int(zoom))
if err != 0 {
return nil, catchVipsError()
}
return out, nil
}
func vipsShrink(input *C.VipsImage, shrink int) (*C.VipsImage, error) {
var image *C.VipsImage
defer C.g_object_unref(C.gpointer(input))
err := C.vips_shrink_bridge(input, &image, C.double(float64(shrink)), C.double(float64(shrink)))
if err != 0 {
return nil, catchVipsError()
}
return image, nil
}
func vipsFlip(image *C.VipsImage, direction Direction) (*C.VipsImage, error) {
var out *C.VipsImage
defer C.g_object_unref(C.gpointer(image))
err := C.vips_flip_bridge(image, &out, C.int(direction))
if err != 0 {
return nil, catchVipsError()
}
return out, nil
}
func vipsRotate(image *C.VipsImage, angle Angle) (*C.VipsImage, error) {
var out *C.VipsImage
defer C.g_object_unref(C.gpointer(image))
err := C.vips_rotate(image, &out, C.int(angle))
if err != 0 {
return nil, catchVipsError()
}
return out, nil
}
func vipsShrinkJpeg(buf []byte, input *C.VipsImage, shrink int) (*C.VipsImage, error) {
var image *C.VipsImage
defer C.g_object_unref(C.gpointer(input))
err := C.vips_jpegload_buffer_shrink(unsafe.Pointer(&buf[0]), C.size_t(len(buf)), &image, C.int(shrink))
if err != 0 {
return nil, catchVipsError()
}
return image, nil
}
func NewApplicationCommandLineFromCPointer(p unsafe.Pointer) *ApplicationCommandLine {
ret := &ApplicationCommandLine{
NewTraitApplicationCommandLine(p),
gobject.NewTraitObject(p),
p,
}
C.g_object_ref_sink(C.gpointer(p))
runtime.SetFinalizer(ret, func(p *ApplicationCommandLine) {
C.g_object_unref(C.gpointer(unsafe.Pointer(p.CPointer)))
})
return ret
}
func NewDBusServerFromCPointer(p unsafe.Pointer) *DBusServer {
ret := &DBusServer{
NewTraitDBusServer(p),
gobject.NewTraitObject(p),
p,
}
C.g_object_ref_sink(C.gpointer(p))
runtime.SetFinalizer(ret, func(p *DBusServer) {
C.g_object_unref(C.gpointer(unsafe.Pointer(p.CPointer)))
})
return ret
}
func NewDesktopAppInfoFromCPointer(p unsafe.Pointer) *DesktopAppInfo {
ret := &DesktopAppInfo{
NewTraitDesktopAppInfo(p),
gobject.NewTraitObject(p),
p,
}
C.g_object_ref_sink(C.gpointer(p))
runtime.SetFinalizer(ret, func(p *DesktopAppInfo) {
C.g_object_unref(C.gpointer(unsafe.Pointer(p.CPointer)))
})
return ret
}
func NewEmblemedIconFromCPointer(p unsafe.Pointer) *EmblemedIcon {
ret := &EmblemedIcon{
NewTraitEmblemedIcon(p),
gobject.NewTraitObject(p),
p,
}
C.g_object_ref_sink(C.gpointer(p))
runtime.SetFinalizer(ret, func(p *EmblemedIcon) {
C.g_object_unref(C.gpointer(unsafe.Pointer(p.CPointer)))
})
return ret
}
func NewFilenameCompleterFromCPointer(p unsafe.Pointer) *FilenameCompleter {
ret := &FilenameCompleter{
NewTraitFilenameCompleter(p),
gobject.NewTraitObject(p),
p,
}
C.g_object_ref_sink(C.gpointer(p))
runtime.SetFinalizer(ret, func(p *FilenameCompleter) {
C.g_object_unref(C.gpointer(unsafe.Pointer(p.CPointer)))
})
return ret
}
func NewInetAddressMaskFromCPointer(p unsafe.Pointer) *InetAddressMask {
ret := &InetAddressMask{
NewTraitInetAddressMask(p),
gobject.NewTraitObject(p),
p,
}
C.g_object_ref_sink(C.gpointer(p))
runtime.SetFinalizer(ret, func(p *InetAddressMask) {
C.g_object_unref(C.gpointer(unsafe.Pointer(p.CPointer)))
})
return ret
}
func NewInputStreamFromCPointer(p unsafe.Pointer) *InputStream {
ret := &InputStream{
NewTraitInputStream(p),
gobject.NewTraitObject(p),
p,
}
C.g_object_ref_sink(C.gpointer(p))
runtime.SetFinalizer(ret, func(p *InputStream) {
C.g_object_unref(C.gpointer(unsafe.Pointer(p.CPointer)))
})
return ret
}
