func NewSurfaceFromPNG(filename string) *Surface {
surface := new(Surface)
p := C.CString(filename)
surface.surface = C.cairo_image_surface_create_from_png(p)
C.free(unsafe.Pointer(p))
surface.context = C.cairo_create(surface.surface)
return surface
}
func NewSurfaceFromPNG(fileName string) (*Surface, error) {
cstr := C.CString(fileName)
defer C.free(unsafe.Pointer(cstr))
surfaceNative := C.cairo_image_surface_create_from_png(cstr)
status := Status(C.cairo_surface_status(surfaceNative))
if status != STATUS_SUCCESS {
return nil, ErrorStatus(status)
}
return &Surface{surfaceNative}, nil
}
func CreateXWindow(width, height int) (*XWindow, error) {
C.XInitThreads()
W := &XWindow{}
W.Display = C.XOpenDisplay(nil)
if W.Display == nil {
return &XWindow{}, errors.New("Can't open display")
}
W.Window = C.XCreateSimpleWindow(W.Display, C.XDefaultRootWindow(W.Display), 0, 0, C.uint(width), C.uint(height), 0, 0, 0xFF151515)
C.XSetWindowBackgroundPixmap(W.Display, W.Window, 0) // This avoids flickering on resize
C.XMapWindow(W.Display, W.Window)
C.XStoreName(W.Display, W.Window, C.CString("gowitt"))
C.XSelectInput(W.Display, W.Window, C.ExposureMask|C.KeyPressMask|C.ButtonPressMask)
C.XFlush(W.Display)
// Cairo
W.Surface = C.cairo_xlib_surface_create(W.Display, C.Drawable(W.Window), C.XDefaultVisual(W.Display, 0), C.int(width), C.int(height))
C.cairo_xlib_surface_set_size(W.Surface, C.int(width), C.int(height))
W.Cairo = C.cairo_create(W.Surface)
// Pango
InitLayoutsCache(W.Cairo)
W.PangoContext = C.pango_cairo_create_context(W.Cairo)
W.FontDesc = C.pango_font_description_from_string(C.CString("Sans 10"))
W.AttrList = C.pango_attr_list_new()
placeholderImage = C.cairo_image_surface_create_from_png(C.CString("test.png"))
W.UserImages = NewImageCache(func() {
var ev C.XEvent
exev := (*C.XExposeEvent)(unsafe.Pointer(&ev))
exev._type = C.Expose
exev.count = 0
exev.window = W.Window
exev.send_event = 1
exev.display = W.Display
C.XSendEvent(W.Display, W.Window, 0, C.ExposureMask, &ev)
C.XFlush(W.Display)
})
return W, nil
}
// 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
}
func NewSurfaceFromPNG(filename string) (*Surface, Status) {
cstr := C.CString(filename)
defer C.free(unsafe.Pointer(cstr))
surfaceNative := C.cairo_image_surface_create_from_png(cstr)
status := Status(C.cairo_surface_status(surfaceNative))
if status != STATUS_SUCCESS {
return nil, status
}
contextNative := C.cairo_create(surfaceNative)
status = Status(C.cairo_status(contextNative))
if status != STATUS_SUCCESS {
return nil, status
}
surface := &Surface{
surface: surfaceNative,
context: contextNative,
}
return surface, STATUS_SUCCESS
}
func NewSurfaceFromPNG(filename string) *Surface {
cs := C.CString(filename)
defer C.free(unsafe.Pointer(cs))
s := C.cairo_image_surface_create_from_png(cs)
return &Surface{surface: s, context: C.cairo_create(s)}
}
