func cNewImageSurface(s *C.cairo_surface_t) (Surface, error) {
format := Format(C.cairo_image_surface_get_format(s))
width := int(C.cairo_image_surface_get_width(s))
height := int(C.cairo_image_surface_get_height(s))
stride := int(C.cairo_image_surface_get_stride(s))
return newImg(s, format, width, height, stride)
}
// pdf, ps, and svg surfaces use the current surface (page)
func (g *Graphic) Image() (image.Image, error) {
var surface *C.cairo_surface_t
switch g.format {
case "eps", "pdf", "ps", "svg":
// map vector surfaces to an image surface
surface = C.cairo_surface_map_to_image(g.surface, nil)
defer C.cairo_surface_unmap_image(g.surface, surface)
status := C.cairo_surface_status(surface)
err := statusToError(status)
if err != nil {
return nil, err
}
case "png", "jpeg":
// no conversion needed
surface = g.surface
}
width := int(C.cairo_image_surface_get_width(surface))
height := int(C.cairo_image_surface_get_height(surface))
stride := int(C.cairo_image_surface_get_stride(surface))
format := C.cairo_image_surface_get_format(surface)
dataPtr := C.cairo_image_surface_get_data(surface)
data := C.GoBytes(unsafe.Pointer(dataPtr), C.int(stride*height))
var img image.Image
switch format {
case C.CAIRO_FORMAT_ARGB32:
img = &extimage.ARGB{
Pix: data,
Stride: stride,
Rect: image.Rect(0, 0, width, height),
}
case C.CAIRO_FORMAT_RGB24:
img = &extimage.RGB{
Pix: data,
Stride: stride,
Rect: image.Rect(0, 0, width, height),
}
case C.CAIRO_FORMAT_A8:
img = &image.Alpha{
Pix: data,
Stride: stride,
Rect: image.Rect(0, 0, width, height),
}
default:
// known unsupported formats:
// CAIRO_FORMAT_INVALID = -1,
// CAIRO_FORMAT_A1 = 3,
// CAIRO_FORMAT_RGB16_565 = 4,
// CAIRO_FORMAT_RGB30 = 5
panic(fmt.Sprintf("unsupported cairo image surface format: %d", int(format)))
}
return img, nil
}
// 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)
}
// Load an image from a PNG file
func Load(path string) (*Image, error) {
var img Image
img.Surf = C.cairo_image_surface_create_from_png(C.CString(path))
switch C.cairo_image_surface_get_format(img.Surf) {
case C.CAIRO_FORMAT_A8:
img.ColorSpace = MODE_A8
case C.CAIRO_FORMAT_RGB24:
img.ColorSpace = MODE_RGB
case C.CAIRO_FORMAT_ARGB32:
img.ColorSpace = MODE_RGBA
default:
fmt.Println("ERROR: Format not supported")
return nil, error("Format not supported")
}
img.W = int(C.cairo_image_surface_get_width(img.Surf))
img.H = int(C.cairo_image_surface_get_height(img.Surf))
img.Ctx = C.cairo_create(img.Surf)
return &img, 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) != 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)
}
func (self *Surface) GetWidth() int {
return int(C.cairo_image_surface_get_width(self.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) != 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)
}
//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))
} else {
surface := cairo.NewSurface(uintptr(unsafe.Pointer(snapResult)), false)
if status := surface.Status(); status == cairo.STATUS_SUCCESS {
response.Reply(surface, nil)
} else {
response.Reply(nil, fmt.Errorf("Cairo surface error %d", status))
}
}
}
}
}