//Unmap uploads the content of the image to the target surface.
//Afterwards, the image is destroyed.
//
//Originally cairo_surface_unmap.
func (m MappedImageSurface) Unmap() error {
err := m.Err()
mismux.Lock()
defer mismux.Unlock()
from := mis[m.id()]
C.cairo_surface_unmap_image(from, m.s)
m.s = nil
return err
}
// 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
}