void
DoubleBufferWindow::OnPaint(Canvas &canvas)
{
std::lock_guard<Mutex> lock(mutex);
canvas.Copy(GetVisibleCanvas());
}
void
DoubleBufferWindow::OnPaint(Canvas &canvas)
{
ScopeLock protect(mutex);
canvas.Copy(GetVisibleCanvas());
}
void
MapWindow::OnPaint(Canvas &canvas)
{
#ifdef ENABLE_OPENGL
DoubleBufferWindow::OnPaint(canvas);
#else /* !ENABLE_OPENGL */
if (buffer_generation == ui_generation)
DoubleBufferWindow::OnPaint(canvas);
else if (scale_buffer > 0 && visible_projection.IsValid() &&
buffer_projection.IsValid()) {
/* while zooming/panning, project the current buffer into the
Canvas */
--scale_buffer;
/* do the projection */
const UPixelScalar buffer_width = buffer_projection.GetScreenWidth();
const UPixelScalar buffer_height = buffer_projection.GetScreenHeight();
const RasterPoint top_left =
visible_projection.GeoToScreen(buffer_projection.ScreenToGeo(0, 0));
RasterPoint bottom_right =
visible_projection.GeoToScreen(buffer_projection.ScreenToGeo(buffer_width,
buffer_height));
/* compensate for rounding errors in destination area */
if (abs(buffer_width - (bottom_right.x - top_left.x)) < 5)
bottom_right.x = top_left.x + buffer_width;
if (abs(buffer_height - (bottom_right.y - top_left.y)) < 5)
bottom_right.y = top_left.y + buffer_height;
if (top_left.x > bottom_right.x || top_left.y > bottom_right.y) {
/* paranoid sanity check */
canvas.ClearWhite();
return;
}
/* clear the areas around the buffer */
canvas.SelectNullPen();
canvas.SelectWhiteBrush();
if (top_left.x > 0)
canvas.Rectangle(0, 0, top_left.x, canvas.GetHeight());
if (bottom_right.x < (int)canvas.GetWidth())
canvas.Rectangle(bottom_right.x, 0,
canvas.GetWidth(), canvas.GetHeight());
if (top_left.y > 0)
canvas.Rectangle(top_left.x, 0, bottom_right.x, top_left.y);
if (bottom_right.y < (int)canvas.GetHeight())
canvas.Rectangle(top_left.x, bottom_right.y,
bottom_right.x, canvas.GetHeight());
/* now stretch the buffer into the window Canvas */
ScopeLock protect(DoubleBufferWindow::mutex);
const Canvas &src = GetVisibleCanvas();
canvas.Stretch(top_left.x, top_left.y,
bottom_right.x - top_left.x, bottom_right.y - top_left.y,
src, 0, 0, buffer_width, buffer_height);
} else
/* the UI has changed since the last DrawThread iteration has
started: the buffer has invalid data, paint a white window
instead */
canvas.ClearWhite();
#endif /* !ENABLE_OPENGL */
}
