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uses
gtkdef, gtkint, CairoXlib, gdk, Cairo, glib;
//procedure gdk_drawable_get_size(drawable: PGdkDrawable; width, height: Pgint); cdecl; external gdkdll;
procedure AlphaBlend(Source, Destination: HDC; const R: TRect; const Target: TPoint; Mode: TBlendMode; ConstantAlpha, Bias: Integer);
function CreateSurface(GtkDC: TGtkDeviceContext): Pcairo_surface_t;
var
Width, Height: gint;
Visual: PGdkVisual;
begin
Result := nil;
if (GtkDC <> nil) and (GtkDC.Drawable <> nil) then
begin
gdk_window_get_size(GtkDC.Drawable, @Width, @Height);
Visual := gdk_visual_get_system;
Result := cairo_xlib_surface_create(
GDK_WINDOW_XDISPLAY(PGdkWindowPrivate(GtkDC.Drawable)),
GDK_WINDOW_XWINDOW(PGdkWindowPrivate(GtkDC.Drawable)),
GDK_VISUAL_XVISUAL(PGdkVisualPrivate(Visual)),
Width, Height);
end;
end;
var
SrcDC: TGtkDeviceContext absolute Source;
DestDC: TGtkDeviceContext absolute Destination;
SrcSurface, DestSurface: Pcairo_surface_t;
SrcContext, DestContext: Pcairo_t;
begin
case Mode of
bmConstantAlpha:;
bmPerPixelAlpha:;
bmMasterAlpha:;
bmConstantAlphaAndColor:
begin
DestSurface := CreateSurface(DestDC);
if DestSurface <> nil then
begin
DestContext := cairo_create(DestSurface);
cairo_set_source_rgba(DestContext,
(Bias and $000000FF) / 255,
((Bias shr 8) and $000000FF) / 255,
((Bias shr 16) and $000000FF) / 255,
ConstantAlpha / 255
);
cairo_rectangle(DestContext, R.Left + Target.x, R.Top + Target.y,
R.Right - R.Left, R.Bottom - R.Top);
cairo_fill(DestContext);
cairo_destroy(DestContext);
cairo_surface_destroy(DestSurface);
end;
end;
end;
end;
function CalculateScanline(Bits: Pointer; Width, Height, Row: Integer): Pointer;
begin
Result := nil;
end;
function GetBitmapBitsFromBitmap(Bitmap: HBITMAP): Pointer;
begin
Result := nil;
end;
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