[gimp] plug-ins: remove now useless code under GTK_CHECK_VERSION(3, 0, 0).

[Jehan <jehanp src gnome org>]

commit 7ce5abd35e6c02288196ab966a009fb4314ff6f3
Author: Jehan <jehan girinstud io>
Date:   Sat Nov 24 11:38:45 2018 +0100

    plug-ins: remove now useless code under GTK_CHECK_VERSION(3, 0, 0).
    
    Grepping for other uses of GTK_CHECK_VERSION(), this was the only
    remaining one, which is obviously useless now on the master branch.

 plug-ins/common/file-pdf-load.c | 181 ----------------------------------------
 1 file changed, 181 deletions(-)
---
diff --git a/plug-ins/common/file-pdf-load.c b/plug-ins/common/file-pdf-load.c
index 802d89f8c0..1d878da4db 100644
--- a/plug-ins/common/file-pdf-load.c
+++ b/plug-ins/common/file-pdf-load.c
@@ -756,187 +756,6 @@ open_document (const gchar  *filename,
   return doc;
 }
 
-/* FIXME: Remove this someday when we depend fully on GTK+ >= 3 */
-
-#if (!GTK_CHECK_VERSION (3, 0, 0))
-
-static cairo_format_t
-gdk_cairo_format_for_content (cairo_content_t content)
-{
-  switch (content)
-    {
-    case CAIRO_CONTENT_COLOR:
-      return CAIRO_FORMAT_RGB24;
-    case CAIRO_CONTENT_ALPHA:
-      return CAIRO_FORMAT_A8;
-    case CAIRO_CONTENT_COLOR_ALPHA:
-    default:
-      return CAIRO_FORMAT_ARGB32;
-    }
-}
-
-static cairo_surface_t *
-gdk_cairo_surface_coerce_to_image (cairo_surface_t *surface,
-                                   cairo_content_t  content,
-                                   int              src_x,
-                                   int              src_y,
-                                   int              width,
-                                   int              height)
-{
-  cairo_surface_t *copy;
-  cairo_t *cr;
-
-  copy = cairo_image_surface_create (gdk_cairo_format_for_content (content),
-                                     width,
-                                     height);
-
-  cr = cairo_create (copy);
-  cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
-  cairo_set_source_surface (cr, surface, -src_x, -src_y);
-  cairo_paint (cr);
-  cairo_destroy (cr);
-
-  return copy;
-}
-
-static void
-convert_alpha (guchar *dest_data,
-               int     dest_stride,
-               guchar *src_data,
-               int     src_stride,
-               int     src_x,
-               int     src_y,
-               int     width,
-               int     height)
-{
-  int x, y;
-
-  src_data += src_stride * src_y + src_x * 4;
-
-  for (y = 0; y < height; y++) {
-    guint32 *src = (guint32 *) src_data;
-
-    for (x = 0; x < width; x++) {
-      guint alpha = src[x] >> 24;
-
-      if (alpha == 0)
-        {
-          dest_data[x * 4 + 0] = 0;
-          dest_data[x * 4 + 1] = 0;
-          dest_data[x * 4 + 2] = 0;
-        }
-      else
-        {
-          dest_data[x * 4 + 0] = (((src[x] & 0xff0000) >> 16) * 255 + alpha / 2) / alpha;
-          dest_data[x * 4 + 1] = (((src[x] & 0x00ff00) >>  8) * 255 + alpha / 2) / alpha;
-          dest_data[x * 4 + 2] = (((src[x] & 0x0000ff) >>  0) * 255 + alpha / 2) / alpha;
-        }
-      dest_data[x * 4 + 3] = alpha;
-    }
-
-    src_data += src_stride;
-    dest_data += dest_stride;
-  }
-}
-
-static void
-convert_no_alpha (guchar *dest_data,
-                  int     dest_stride,
-                  guchar *src_data,
-                  int     src_stride,
-                  int     src_x,
-                  int     src_y,
-                  int     width,
-                  int     height)
-{
-  int x, y;
-
-  src_data += src_stride * src_y + src_x * 4;
-
-  for (y = 0; y < height; y++) {
-    guint32 *src = (guint32 *) src_data;
-
-    for (x = 0; x < width; x++) {
-      dest_data[x * 3 + 0] = src[x] >> 16;
-      dest_data[x * 3 + 1] = src[x] >>  8;
-      dest_data[x * 3 + 2] = src[x];
-    }
-
-    src_data += src_stride;
-    dest_data += dest_stride;
-  }
-}
-
-/**
- * gdk_pixbuf_get_from_surface:
- * @surface: surface to copy from
- * @src_x: Source X coordinate within @surface
- * @src_y: Source Y coordinate within @surface
- * @width: Width in pixels of region to get
- * @height: Height in pixels of region to get
- *
- * Transfers image data from a #cairo_surface_t and converts it to an RGB(A)
- * representation inside a #GdkPixbuf. This allows you to efficiently read
- * individual pixels from cairo surfaces. For #GdkWindows, use
- * gdk_pixbuf_get_from_window() instead.
- *
- * This function will create an RGB pixbuf with 8 bits per channel.
- * The pixbuf will contain an alpha channel if the @surface contains one.
- *
- * Return value: (transfer full): A newly-created pixbuf with a reference
- *     count of 1, or %NULL on error
- */
-static GdkPixbuf *
-gdk_pixbuf_get_from_surface  (cairo_surface_t *surface,
-                              gint             src_x,
-                              gint             src_y,
-                              gint             width,
-                              gint             height)
-{
-  cairo_content_t content;
-  GdkPixbuf *dest;
-
-  /* General sanity checks */
-  g_return_val_if_fail (surface != NULL, NULL);
-  g_return_val_if_fail (width > 0 && height > 0, NULL);
-
-  content = cairo_surface_get_content (surface) | CAIRO_CONTENT_COLOR;
-  dest = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
-                         !!(content & CAIRO_CONTENT_ALPHA),
-                         8,
-                         width, height);
-
-  surface = gdk_cairo_surface_coerce_to_image (surface, content,
-                                               src_x, src_y,
-                                               width, height);
-  cairo_surface_flush (surface);
-  if (cairo_surface_status (surface) || dest == NULL)
-    {
-      cairo_surface_destroy (surface);
-      return NULL;
-    }
-
-  if (gdk_pixbuf_get_has_alpha (dest))
-    convert_alpha (gdk_pixbuf_get_pixels (dest),
-                   gdk_pixbuf_get_rowstride (dest),
-                   cairo_image_surface_get_data (surface),
-                   cairo_image_surface_get_stride (surface),
-                   0, 0,
-                   width, height);
-  else
-    convert_no_alpha (gdk_pixbuf_get_pixels (dest),
-                      gdk_pixbuf_get_rowstride (dest),
-                      cairo_image_surface_get_data (surface),
-                      cairo_image_surface_get_stride (surface),
-                      0, 0,
-                      width, height);
-
-  cairo_surface_destroy (surface);
-  return dest;
-}
-
-#endif
-
 static gint32
 layer_from_surface (gint32           image,
                     const gchar     *layer_name,