Golang C.cairo_surface_destroy函數代碼示例

func (s *CairoSurface) Destroy() error {
	C.cairo_surface_destroy(s.nativePointer())
	if err := s.status(); err != nil {
		return err
	}

	*s = 0
	return nil
}

//Close frees the resources used by this surface.
//
//Originally cairo_surface_destroy.
func (e *XtensionSurface) Close() error {
	if e.s == nil {
		return nil
	}
	err := e.Err()
	C.cairo_surface_destroy(e.s)
	e.s = nil
	runtime.SetFinalizer(e, nil)
	return err
}

// GetSnapshotCustom runs asynchronously, taking a snapshot of the WebView.
// Upon completion, resultCallback will be called with a copy of the underlying
// bitmap backing store for the frame, or with an error encountered during
// execution.
//
// See also: webkit_web_view_get_snapshot at
// http://webkitgtk.org/reference/webkit2gtk/stable/WebKitWebView.html#webkit-web-view-get-snapshot
func (v *WebView) GetSnapshotCustom(region SnapshotRegion, options SnapshotOptions, resultCallback func(result *image.RGBA, err error)) {
	var cCallback C.GAsyncReadyCallback
	var userData C.gpointer
	var err error
	if resultCallback != nil {
		callback := func(result *C.GAsyncResult) {
			var snapErr *C.GError
			snapResult := C.webkit_web_view_get_snapshot_finish(v.webView, result, &snapErr)
			if snapResult == nil {
				defer C.g_error_free(snapErr)
				msg := C.GoString((*C.char)(snapErr.message))
				resultCallback(nil, errors.New(msg))
				return
			}
			defer C.cairo_surface_destroy(snapResult)

			if C.cairo_surface_get_type(snapResult) != cairoSurfaceTypeImage ||
				C.cairo_image_surface_get_format(snapResult) != cairoImageSurfaceFormatARGB32 {
				panic("Snapshot in unexpected format")
			}

			w := int(C.cairo_image_surface_get_width(snapResult))
			h := int(C.cairo_image_surface_get_height(snapResult))
			stride := int(C.cairo_image_surface_get_stride(snapResult))
			C.cairo_surface_flush(snapResult)
			data := unsafe.Pointer(C.cairo_image_surface_get_data(snapResult))

			//(miha) fix endianes depended byte order, and copy to go slice at the same time.
			data_fixed := make([]byte, stride*h)
			C.gowk2_cairo_endian_depended_ARGB32_to_RGBA((*C.uchar)(data), (*C.uchar)(&data_fixed[0]), C.uint(stride*h))
			rgba := &image.RGBA{data_fixed, stride, image.Rect(0, 0, w, h)}

			// slower but doesn't use Go pointers inside C. See https://github.com/golang/go/issues/8310 !!!!!!!
			//C.gowk2_cairo_endian_depended_ARGB32_to_RGBA((*C.uchar)(data), C.uint(stride*h))
			//rgba := &image.RGBA{C.GoBytes(data, C.int(stride*h)), stride, image.Rect(0, 0, w, h)}

			resultCallback(rgba, nil)
		}
		cCallback, userData, err = newGAsyncReadyCallback(callback)
		if err != nil {
			panic(err)
		}
	}

	C.webkit_web_view_get_snapshot(v.webView,
		(C.WebKitSnapshotRegion)(region),
		(C.WebKitSnapshotOptions)(options),
		nil,
		cCallback,
		userData)
}

func (i *imagelist) Append(img *image.RGBA) {
	var width, height C.gint

	surface := C.cairo_image_surface_create(C.CAIRO_FORMAT_ARGB32,
		C.int(img.Rect.Dx()),
		C.int(img.Rect.Dy()))
	if status := C.cairo_surface_status(surface); status != C.CAIRO_STATUS_SUCCESS {
		panic(fmt.Errorf("cairo_create_image_surface() failed in ImageList.Append(): %s\n",
			C.GoString(C.cairo_status_to_string(status))))
	}
	C.cairo_surface_flush(surface)
	toARGB(img, uintptr(unsafe.Pointer(C.cairo_image_surface_get_data(surface))),
		int(C.cairo_image_surface_get_stride(surface)), false) // not NRGBA
	C.cairo_surface_mark_dirty(surface)
	basepixbuf := C.gdk_pixbuf_get_from_surface(surface, 0, 0, C.gint(img.Rect.Dx()), C.gint(img.Rect.Dy()))
	if basepixbuf == nil {
		panic(fmt.Errorf("gdk_pixbuf_get_from_surface() failed in ImageList.Append() (no reason available)"))
	}

	if C.gtk_icon_size_lookup(scaleTo, &width, &height) == C.FALSE {
		panic(fmt.Errorf("gtk_icon_size_lookup() failed in ImageList.Append() (no reason available)"))
	}
	if int(width) == img.Rect.Dx() && int(height) == img.Rect.Dy() {
		// just add the base pixbuf; we're good
		i.list = append(i.list, basepixbuf)
		C.cairo_surface_destroy(surface)
		return
	}
	// else scale
	pixbuf := C.gdk_pixbuf_scale_simple(basepixbuf, C.int(width), C.int(height), C.GDK_INTERP_NEAREST)
	if pixbuf == nil {
		panic(fmt.Errorf("gdk_pixbuf_scale_simple() failed in ImageList.Append() (no reason available)"))
	}

	i.list = append(i.list, pixbuf)
	C.gdk_pixbuf_unref(basepixbuf)
	C.cairo_surface_destroy(surface)
}

// GetSnapshot runs asynchronously, taking a snapshot of the WebView.
// Upon completion, resultCallback will be called with a copy of the underlying
// bitmap backing store for the frame, or with an error encountered during
// execution.
//
// See also: webkit_web_view_get_snapshot at
// http://webkitgtk.org/reference/webkit2gtk/stable/WebKitWebView.html#webkit-web-view-get-snapshot
func (v *WebView) GetSnapshot(resultCallback func(result *image.RGBA, err error)) {
	var cCallback C.GAsyncReadyCallback
	var userData C.gpointer
	var err error
	if resultCallback != nil {
		callback := func(result *C.GAsyncResult) {
			var snapErr *C.GError
			snapResult := C.webkit_web_view_get_snapshot_finish(v.webView, result, &snapErr)
			if snapResult == nil {
				defer C.g_error_free(snapErr)
				msg := C.GoString((*C.char)(snapErr.message))
				resultCallback(nil, errors.New(msg))
				return
			}
			defer C.cairo_surface_destroy(snapResult)

			if C.cairo_surface_get_type(snapResult) != cairoSurfaceTypeImage ||
				C.cairo_image_surface_get_format(snapResult) != cairoImageSurfaceFormatARB32 {
				panic("Snapshot in unexpected format")
			}

			w := int(C.cairo_image_surface_get_width(snapResult))
			h := int(C.cairo_image_surface_get_height(snapResult))
			stride := int(C.cairo_image_surface_get_stride(snapResult))
			data := unsafe.Pointer(C.cairo_image_surface_get_data(snapResult))
			rgba := &image.RGBA{C.GoBytes(data, C.int(stride*h)), stride, image.Rect(0, 0, w, h)}
			resultCallback(rgba, nil)
		}
		cCallback, userData, err = newGAsyncReadyCallback(callback)
		if err != nil {
			panic(err)
		}
	}

	C.webkit_web_view_get_snapshot(v.webView,
		(C.WebKitSnapshotRegion)(1), // FullDocument is the only working region at this point
		(C.WebKitSnapshotOptions)(0),
		nil,
		cCallback,
		userData)
}

//export our_area_draw_callback
func our_area_draw_callback(widget *C.GtkWidget, cr *C.cairo_t, data C.gpointer) C.gboolean {
	var x0, y0, x1, y1 C.double
	var maxwid, maxht C.gint

	s := (*sysData)(unsafe.Pointer(data))
	// thanks to desrt in irc.gimp.net/#gtk+
	// these are in user coordinates, which match what coordinates we want by default, even out of a draw event handler (thanks johncc3, mclasen, and Company in irc.gimp.net/#gtk+)
	C.cairo_clip_extents(cr, &x0, &y0, &x1, &y1)
	// we do not need to clear the cliprect; GtkDrawingArea did it for us beforehand
	cliprect := image.Rect(int(x0), int(y0), int(x1), int(y1))
	// the cliprect can actually fall outside the size of the Area; clip it by intersecting the two rectangles
	C.gtk_widget_get_size_request(widget, &maxwid, &maxht)
	cliprect = image.Rect(0, 0, int(maxwid), int(maxht)).Intersect(cliprect)
	if cliprect.Empty() { // no intersection; nothing to paint
		return C.FALSE // signals handled without stopping the event chain (thanks to desrt again)
	}
	i := s.handler.Paint(cliprect)
	surface := C.cairo_image_surface_create(
		C.CAIRO_FORMAT_ARGB32, // alpha-premultiplied; native byte order
		C.int(i.Rect.Dx()),
		C.int(i.Rect.Dy()))
	if status := C.cairo_surface_status(surface); status != C.CAIRO_STATUS_SUCCESS {
		panic(fmt.Errorf("cairo_create_image_surface() failed: %s\n",
			C.GoString(C.cairo_status_to_string(status))))
	}
	// the flush and mark_dirty calls are required; see the cairo docs and https://git.gnome.org/browse/gtk+/tree/gdk/gdkcairo.c#n232 (thanks desrt in irc.gimp.net/#gtk+)
	C.cairo_surface_flush(surface)
	toARGB(i, uintptr(unsafe.Pointer(C.cairo_image_surface_get_data(surface))),
		int(C.cairo_image_surface_get_stride(surface)))
	C.cairo_surface_mark_dirty(surface)
	C.cairo_set_source_surface(cr,
		surface,
		0, 0) // origin of the surface
	// that just set the brush that cairo uses: we have to actually draw now
	// (via https://developer.gnome.org/gtkmm-tutorial/stable/sec-draw-images.html.en)
	C.cairo_rectangle(cr, x0, y0, x1, y1) // breaking the nrom here since we have the coordinates as a C double already
	C.cairo_fill(cr)
	C.cairo_surface_destroy(surface) // free surface
	return C.FALSE                   // signals handled without stopping the event chain (thanks to desrt again)
}

func (self *Surface) Destroy() {
	C.cairo_destroy(self.context)
	C.cairo_surface_destroy(self.surface)
}

// destroy is a wrapper around cairo_surface_destroy().
func (v *Surface) destroy() {
	C.cairo_surface_destroy(v.native())
}

func (self *Surface) destroy() { C.cairo_surface_destroy(self.surface) }

// completes and closes the file being written to
func (g *Graphic) Close() error {
	// destroy the context
	err := g.cairoStatus()
	if err != nil {
		return err
	}
	C.cairo_destroy(g.cr)

	// finishing the surface writes pdf, ps, and svg files
	C.cairo_surface_finish(g.surface)
	err = g.cairoSurfaceStatus()
	if err != nil {
		return err
	}

	// write other formats
	switch g.format {
	case "eps", "pdf", "ps", "svg":
		// cairo_surface_finish writes the surface to file
	case "png":
		img, err := g.Image()
		if err != nil {
			return err
		}

		file, err := os.Create(g.filename)
		if err != nil {
			return err
		}
		defer file.Close()

		err = png.Encode(file, img)
		if err != nil {
			return err
		}
	case "jpeg":
		img, err := g.Image()
		if err != nil {
			return err
		}

		file, err := os.Create(g.filename)
		if err != nil {
			return err
		}
		defer file.Close()

		err = jpeg.Encode(file, img, nil)
		if err != nil {
			return err
		}
	default:
		panic("unsupported format: " + g.format)
	}

	// destroy the surface
	C.cairo_surface_destroy(g.surface)
	err = g.cairoSurfaceStatus()
	if err != nil {
		return err
	}

	return nil
}

// GetSnapshot runs asynchronously, taking a snapshot of the WebView.
// Upon completion, resultCallback will be called with a copy of the underlying
// bitmap backing store for the frame, or with an error encountered during
// execution.
//
// See also: webkit_web_view_get_snapshot at
// http://webkitgtk.org/reference/webkit2gtk/stable/WebKitWebView.html#webkit-web-view-get-snapshot
func (v *WebView) GetSnapshot(resultCallback func(result *image.RGBA, err error)) {
	var cCallback C.GAsyncReadyCallback
	var userData C.gpointer
	var err error
	if resultCallback != nil {
		callback := func(result *C.GAsyncResult) {
			var snapErr *C.GError
			snapResult := C.webkit_web_view_get_snapshot_finish(v.webView, result, &snapErr)
			if snapResult == nil {
				defer C.g_error_free(snapErr)
				msg := C.GoString((*C.char)(snapErr.message))
				resultCallback(nil, errors.New(msg))
				return
			}
			defer C.cairo_surface_destroy(snapResult)

			if C.cairo_surface_get_type(snapResult) != cairoSurfaceTypeImage ||
				C.cairo_image_surface_get_format(snapResult) != cairoImageSurfaceFormatARGB32 {
				panic("Snapshot in unexpected format")
			}

			w := int(C.cairo_image_surface_get_width(snapResult))
			h := int(C.cairo_image_surface_get_height(snapResult))
			stride := int(C.cairo_image_surface_get_stride(snapResult))
			data := unsafe.Pointer(C.cairo_image_surface_get_data(snapResult))
			surfaceBytes := C.GoBytes(data, C.int(stride*h))
			// convert from b,g,r,a or a,r,g,b(local endianness) to r,g,b,a
			testint, _ := binary.ReadUvarint(bytes.NewBuffer([]byte{0x1, 0}))
			if testint == 0x1 {
				// Little: b,g,r,a -> r,g,b,a
				for i := 0; i < w*h; i++ {
					b := surfaceBytes[4*i+0]
					r := surfaceBytes[4*i+2]
					surfaceBytes[4*i+0] = r
					surfaceBytes[4*i+2] = b
				}
			} else {
				// Big: a,r,g,b -> r,g,b,a
				for i := 0; i < w*h; i++ {
					a := surfaceBytes[4*i+0]
					r := surfaceBytes[4*i+1]
					g := surfaceBytes[4*i+2]
					b := surfaceBytes[4*i+3]
					surfaceBytes[4*i+0] = r
					surfaceBytes[4*i+1] = g
					surfaceBytes[4*i+2] = b
					surfaceBytes[4*i+3] = a
				}
			}
			rgba := &image.RGBA{surfaceBytes, stride, image.Rect(0, 0, w, h)}
			resultCallback(rgba, nil)
		}
		cCallback, userData, err = newGAsyncReadyCallback(callback)
		if err != nil {
			panic(err)
		}
	}

	C.webkit_web_view_get_snapshot(v.webView,
		(C.WebKitSnapshotRegion)(1), // FullDocument is the only working region at this point
		(C.WebKitSnapshotOptions)(0),
		nil,
		cCallback,
		userData)
}

func (t *PDFStreamTextObject) Close() {
	C.cairo_destroy(t.context)
	C.cairo_surface_destroy(t.surface)
	t.context = nil
	t.surface = nil
}

//export go_genericGAsyncCallback
func go_genericGAsyncCallback(source *C.GObject, result *C.GAsyncResult, callbackId *C.char) {
	key := C.GoString(callbackId)

	if obj, ok := cgoget(key); ok {
		switch obj.(type) {
		case *RunJavaScriptResponse:
			var jserr *C.GError

			response := obj.(*RunJavaScriptResponse)

			if response.Autoremove {
				defer cgounregister(key)
			}

			if jsResult := C.webkit_web_view_run_javascript_finish(response.CWebView, result, &jserr); jsResult == nil {
				defer C.g_error_free(jserr)
				msg := C.GoString((*C.char)(jserr.message))
				response.Reply(nil, errors.New(msg))
			} else {
				ctxRaw := gojs.RawGlobalContext(unsafe.Pointer(C.webkit_javascript_result_get_global_context(jsResult)))
				jsValRaw := gojs.RawValue(unsafe.Pointer(C.webkit_javascript_result_get_value(jsResult)))
				ctx := (*gojs.Context)(gojs.NewGlobalContextFrom(ctxRaw))
				jsVal := ctx.NewValueFrom(jsValRaw)
				response.Reply(jsVal, nil)
			}

		case *GetSnapshotAsImageResponse:
			var snapErr *C.GError

			response := obj.(*GetSnapshotAsImageResponse)

			if response.Autoremove {
				defer cgounregister(key)
			}

			if snapResult := C.webkit_web_view_get_snapshot_finish(response.CWebView, result, &snapErr); snapResult == nil {
				defer C.g_error_free(snapErr)
				msg := C.GoString((*C.char)(snapErr.message))
				response.Reply(nil, errors.New(msg))
			} else {
				defer C.cairo_surface_destroy(snapResult)

				if C.cairo_surface_get_type(snapResult) != cairoSurfaceTypeImage ||
					C.cairo_image_surface_get_format(snapResult) != cairoImageSurfaceFormatARGB32 {
					response.Reply(nil, errors.New("Snapshot in unexpected format"))
					return
				}

				w := int(C.cairo_image_surface_get_width(snapResult))
				h := int(C.cairo_image_surface_get_height(snapResult))
				stride := int(C.cairo_image_surface_get_stride(snapResult))
				data := unsafe.Pointer(C.cairo_image_surface_get_data(snapResult))
				surfaceBytes := C.GoBytes(data, C.int(stride*h))

				// convert from b,g,r,a or a,r,g,b(local endianness) to r,g,b,a
				testint, _ := binary.ReadUvarint(bytes.NewBuffer([]byte{0x1, 0}))

				if testint == 0x1 {
					// Little: b,g,r,a -> r,g,b,a
					for i := 0; i < w*h; i++ {
						b := surfaceBytes[4*i+0]
						r := surfaceBytes[4*i+2]
						surfaceBytes[4*i+0] = r
						surfaceBytes[4*i+2] = b
					}
				} else {
					// Big: a,r,g,b -> r,g,b,a
					for i := 0; i < w*h; i++ {
						a := surfaceBytes[4*i+0]
						r := surfaceBytes[4*i+1]
						g := surfaceBytes[4*i+2]
						b := surfaceBytes[4*i+3]
						surfaceBytes[4*i+0] = r
						surfaceBytes[4*i+1] = g
						surfaceBytes[4*i+2] = b
						surfaceBytes[4*i+3] = a
					}
				}

				rgba := &image.RGBA{
					Pix:    surfaceBytes,
					Stride: stride,
					Rect:   image.Rect(0, 0, w, h),
				}

				response.Reply(rgba, nil)
			}

		case *GetSnapshotAsCairoSurfaceResponse:
			var snapErr *C.GError

			response := obj.(*GetSnapshotAsCairoSurfaceResponse)

			snapResult := C.webkit_web_view_get_snapshot_finish(response.CWebView, result, &snapErr)

			if snapResult == nil {
				defer C.g_error_free(snapErr)
				msg := C.GoString((*C.char)(snapErr.message))
				response.Reply(nil, errors.New(msg))
//.........這裏部分代碼省略.........