static void
nova_center_update (GtkWidget *widget,
NovaCenter *center,
gint x,
gint y)
{
gint tx, ty;
GimpPreviewArea *area = GIMP_PREVIEW_AREA (center->preview->area);
GtkAllocation allocation;
gtk_widget_get_allocation (GTK_WIDGET (area), &allocation);
x -= (allocation.width - area->width) / 2;
y -= (allocation.height - area->height) / 2;
gimp_preview_untransform (center->preview, x, y, &tx, &ty);
g_signal_handlers_block_by_func (center->coords,
nova_center_coords_update,
center);
gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (center->coords), 0, tx);
gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (center->coords), 1, ty);
g_signal_handlers_unblock_by_func (center->coords,
nova_center_coords_update,
center);
nova_center_coords_update (GIMP_SIZE_ENTRY (center->coords), center);
gtk_widget_queue_draw (center->preview->area);
}
static gboolean
nova_center_update (GtkWidget *widget,
NovaCenter *center,
gint x,
gint y)
{
gint tx, ty;
gimp_preview_untransform (center->preview, x, y, &tx, &ty);
nova_center_cursor_draw (center);
g_signal_handlers_block_by_func (center->coords,
nova_center_coords_update,
center);
gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (center->coords), 0, tx);
gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (center->coords), 1, ty);
g_signal_handlers_unblock_by_func (center->coords,
nova_center_coords_update,
center);
nova_center_coords_update (GIMP_SIZE_ENTRY (center->coords), center);
return TRUE;
}
static void
lens_distort_preview (GimpDrawable *drawable,
GimpPreview *preview)
{
guchar *dest;
guchar *pixel;
gint width, height, bpp;
gint x, y;
GimpPixelFetcher *pft;
GimpRGB background;
pft = gimp_pixel_fetcher_new (drawable, FALSE);
gimp_context_get_background (&background);
gimp_rgb_set_alpha (&background, 0.0);
gimp_pixel_fetcher_set_bg_color (pft, &background);
gimp_pixel_fetcher_set_edge_mode (pft, GIMP_PIXEL_FETCHER_EDGE_BACKGROUND);
lens_setup_calc (drawable->width, drawable->height);
dest = gimp_zoom_preview_get_source (GIMP_ZOOM_PREVIEW (preview),
&width, &height, &bpp);
pixel = dest;
for (y = 0; y < height; y++)
{
for (x = 0; x < width; x++)
{
gint sx, sy;
gimp_preview_untransform (preview, x, y, &sx, &sy);
lens_distort_func (sx, sy, pixel, bpp, pft);
pixel += bpp;
}
}
gimp_pixel_fetcher_destroy (pft);
gimp_preview_draw_buffer (preview, dest, width * bpp);
g_free (dest);
}
static void
dialog_update_preview (GimpDrawable *drawable,
GimpPreview *preview)
{
gdouble cx, cy;
gint x, y;
gint sx, sy;
gint width, height;
guchar *pixel;
guchar outside[4];
GimpRGB background;
guchar *dest;
gint j;
gint bpp;
GimpPixelFetcher *pft;
guchar in_pixels[4][4];
guchar *in_values[4];
for (j = 0; j < 4; j++)
in_values[j] = in_pixels[j];
pft = gimp_pixel_fetcher_new (drawable, FALSE);
gimp_context_get_background (&background);
gimp_rgb_set_alpha (&background, 0.0);
gimp_drawable_get_color_uchar (drawable->drawable_id, &background, outside);
gimp_pixel_fetcher_set_bg_color (pft, &background);
gimp_pixel_fetcher_set_edge_mode (pft, GIMP_PIXEL_FETCHER_EDGE_SMEAR);
dest = gimp_zoom_preview_get_source (GIMP_ZOOM_PREVIEW (preview),
&width, &height, &bpp);
pixel = dest;
for (y = 0; y < height; y++)
{
for (x = 0; x < width; x++)
{
gimp_preview_untransform (preview, x, y, &sx, &sy);
if (calc_undistorted_coords ((gdouble)sx, (gdouble)sy,
&cx, &cy))
{
gimp_pixel_fetcher_get_pixel (pft, cx, cy, in_pixels[0]);
gimp_pixel_fetcher_get_pixel (pft, cx + 1, cy, in_pixels[1]);
gimp_pixel_fetcher_get_pixel (pft, cx, cy + 1, in_pixels[2]);
gimp_pixel_fetcher_get_pixel (pft, cx + 1, cy + 1, in_pixels[3]);
gimp_bilinear_pixels_8 (pixel, cx, cy, bpp,
img_has_alpha, in_values);
}
else
{
for (j = 0; j < bpp; j++)
pixel[j] = outside[j];
}
pixel += bpp;
}
}
gimp_pixel_fetcher_destroy (pft);
gimp_preview_draw_buffer (preview, dest, width * bpp);
g_free (dest);
}
