[gtk/matthiasc/for-master: 1/2] image, picture: Move pixbuf code to gdkpixbufutils

[Matthias Clasen <matthiasc src gnome org>]

commit 91f3f5c63babccb0ea493b4efd72c0e731622507
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Apr 16 17:17:26 2021 -0400

    image, picture: Move pixbuf code to gdkpixbufutils
    
    This cleans up and moves the code to load files
    while taking the scale into account. Along the way,
    we drop the last uses of GdkPixbufAnimation, and
    consolidate the pixbuf using code in one place.

 gtk/gdkpixbufutils.c        | 128 +++++++++++++++++++++++++++++++++++++++
 gtk/gdkpixbufutilsprivate.h |  10 ++++
 gtk/gtkimage.c              | 143 +++++++-------------------------------------
 gtk/gtkpicture.c            |  75 +----------------------
 4 files changed, 160 insertions(+), 196 deletions(-)
---
diff --git a/gtk/gdkpixbufutils.c b/gtk/gdkpixbufutils.c
index 2aa62b094c..d1b6693918 100644
--- a/gtk/gdkpixbufutils.c
+++ b/gtk/gdkpixbufutils.c
@@ -18,6 +18,7 @@
 
 #include <gdk/gdk.h>
 #include "gdkpixbufutilsprivate.h"
+#include "gtkscalerprivate.h"
 
 static GdkPixbuf *
 load_from_stream (GdkPixbufLoader  *loader,
@@ -572,3 +573,130 @@ gtk_make_symbolic_texture_from_file (GFile       *file,
 
   return texture;
 }
+
+typedef struct {
+  int scale_factor;
+} LoaderData;
+
+static void
+on_loader_size_prepared (GdkPixbufLoader *loader,
+                         int              width,
+                         int              height,
+                         gpointer         user_data)
+{
+  LoaderData *loader_data = user_data;
+  GdkPixbufFormat *format;
+
+  /* Let the regular icon helper code path handle non-scalable images */
+  format = gdk_pixbuf_loader_get_format (loader);
+  if (!gdk_pixbuf_format_is_scalable (format))
+    {
+      loader_data->scale_factor = 1;
+      return;
+    }
+
+  gdk_pixbuf_loader_set_size (loader,
+                              width * loader_data->scale_factor,
+                              height * loader_data->scale_factor);
+}
+
+GdkPaintable *
+gdk_paintable_new_from_bytes_scaled (GBytes *bytes,
+                                     int     scale_factor)
+{
+  GdkPixbufLoader *loader;
+  GdkPixbuf *pixbuf = NULL;
+  LoaderData loader_data;
+  GdkTexture *texture;
+  GdkPaintable *paintable;
+
+  loader_data.scale_factor = scale_factor;
+
+  loader = gdk_pixbuf_loader_new ();
+  g_signal_connect (loader, "size-prepared",
+                    G_CALLBACK (on_loader_size_prepared), &loader_data);
+
+  if (!gdk_pixbuf_loader_write_bytes (loader, bytes, NULL))
+    goto out;
+
+  if (!gdk_pixbuf_loader_close (loader, NULL))
+    goto out;
+
+  pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
+  if (pixbuf != NULL)
+    g_object_ref (pixbuf);
+
+ out:
+  gdk_pixbuf_loader_close (loader, NULL);
+  g_object_unref (loader);
+
+  if (!pixbuf)
+    return NULL;
+
+  texture = gdk_texture_new_for_pixbuf (pixbuf);
+  if (loader_data.scale_factor != 1)
+    paintable = gtk_scaler_new (GDK_PAINTABLE (texture), loader_data.scale_factor);
+  else
+    paintable = g_object_ref ((GdkPaintable *)texture);
+
+  g_object_unref (pixbuf);
+  g_object_unref (texture);
+
+  return paintable;
+}
+
+GdkPaintable *
+gdk_paintable_new_from_path_scaled (const char *path,
+                                    int         scale_factor)
+{
+  char *contents;
+  gsize length;
+  GBytes *bytes;
+  GdkPaintable *paintable;
+
+  if (!g_file_get_contents (path, &contents, &length, NULL))
+    return NULL;
+
+  bytes = g_bytes_new_take (contents, length);
+
+  paintable = gdk_paintable_new_from_bytes_scaled (bytes, scale_factor);
+
+  g_bytes_unref (bytes);
+
+  return paintable;
+}
+
+GdkPaintable *
+gdk_paintable_new_from_resource_scaled (const char *path,
+                                        int         scale_factor)
+{
+  GBytes *bytes;
+  GdkPaintable *paintable;
+
+  bytes = g_resources_lookup_data (path, G_RESOURCE_LOOKUP_FLAGS_NONE, NULL);
+  if (!bytes)
+    return NULL;
+
+  paintable = gdk_paintable_new_from_bytes_scaled (bytes, scale_factor);
+  g_bytes_unref (bytes);
+
+  return paintable;
+}
+
+GdkPaintable *
+gdk_paintable_new_from_file_scaled (GFile *file,
+                                    int    scale_factor)
+{
+  GBytes *bytes;
+  GdkPaintable *paintable;
+
+  bytes = g_file_load_bytes (file, NULL, NULL, NULL);
+  if (!bytes)
+    return NULL;
+
+  paintable = gdk_paintable_new_from_bytes_scaled (bytes, scale_factor);
+
+  g_bytes_unref (bytes);
+
+  return paintable;
+}
diff --git a/gtk/gdkpixbufutilsprivate.h b/gtk/gdkpixbufutilsprivate.h
index 2a339d2c42..62efe3699e 100644
--- a/gtk/gdkpixbufutilsprivate.h
+++ b/gtk/gdkpixbufutilsprivate.h
@@ -86,6 +86,16 @@ GdkTexture *gtk_make_symbolic_texture_from_resource (const char    *path,
                                                      int            height,
                                                      double         scale,
                                                      GError       **error);
+
+GdkPaintable *gdk_paintable_new_from_bytes_scaled    (GBytes        *bytes,
+                                                      int            scale_factor);
+GdkPaintable *gdk_paintable_new_from_path_scaled     (const char    *path,
+                                                      int            scale_factor);
+GdkPaintable *gdk_paintable_new_from_resource_scaled (const char    *path,
+                                                      int            scale_factor);
+GdkPaintable *gdk_paintable_new_from_file_scaled     (GFile         *file,
+                                                      int            scale_factor);
+
 G_END_DECLS
 
 #endif  /* __GDK_PIXBUF_UTILS_PRIVATE_H__ */
diff --git a/gtk/gtkimage.c b/gtk/gtkimage.c
index abe5694c71..46a494c738 100644
--- a/gtk/gtkimage.c
+++ b/gtk/gtkimage.c
@@ -30,10 +30,10 @@
 #include "gtkicontheme.h"
 #include "gtkintl.h"
 #include "gtkprivate.h"
-#include "gtkscalerprivate.h"
 #include "gtksnapshot.h"
 #include "gtktypebuiltins.h"
 #include "gtkwidgetprivate.h"
+#include "gdkpixbufutilsprivate.h"
 
 #include <math.h>
 #include <string.h>
@@ -581,96 +581,6 @@ gtk_image_new_from_gicon (GIcon *icon)
   return GTK_WIDGET (image);
 }
 
-typedef struct {
-  GtkImage *image;
-  int scale_factor;
-} LoaderData;
-
-static void
-on_loader_size_prepared (GdkPixbufLoader *loader,
-                        int              width,
-                        int              height,
-                        gpointer         user_data)
-{
-  LoaderData *loader_data = user_data;
-  int scale_factor;
-  GdkPixbufFormat *format;
-
-  /* Let the regular icon helper code path handle non-scalable images */
-  format = gdk_pixbuf_loader_get_format (loader);
-  if (!gdk_pixbuf_format_is_scalable (format))
-    {
-      loader_data->scale_factor = 1;
-      return;
-    }
-
-  scale_factor = gtk_widget_get_scale_factor (GTK_WIDGET (loader_data->image));
-  gdk_pixbuf_loader_set_size (loader, width * scale_factor, height * scale_factor);
-  loader_data->scale_factor = scale_factor;
-}
-
-static GdkPixbufAnimation *
-load_scalable_with_loader (GtkImage    *image,
-                          const char *file_path,
-                          const char *resource_path,
-                          int         *scale_factor_out)
-{
-  GdkPixbufLoader *loader;
-  GBytes *bytes;
-  char *contents;
-  gsize length;
-  gboolean res;
-  GdkPixbufAnimation *animation;
-  LoaderData loader_data;
-
-  animation = NULL;
-  bytes = NULL;
-
-  loader = gdk_pixbuf_loader_new ();
-  loader_data.image = image;
-
-  g_signal_connect (loader, "size-prepared", G_CALLBACK (on_loader_size_prepared), &loader_data);
-
-  if (resource_path != NULL)
-    {
-      bytes = g_resources_lookup_data (resource_path, G_RESOURCE_LOOKUP_FLAGS_NONE, NULL);
-    }
-  else if (file_path != NULL)
-    {
-      res = g_file_get_contents (file_path, &contents, &length, NULL);
-      if (res)
-       bytes = g_bytes_new_take (contents, length);
-    }
-  else
-    {
-      g_assert_not_reached ();
-    }
-
-  if (!bytes)
-    goto out;
-
-  if (!gdk_pixbuf_loader_write_bytes (loader, bytes, NULL))
-    goto out;
-
-  if (!gdk_pixbuf_loader_close (loader, NULL))
-    goto out;
-
-  animation = gdk_pixbuf_loader_get_animation (loader);
-  if (animation != NULL)
-    {
-      g_object_ref (animation);
-      if (scale_factor_out != NULL)
-       *scale_factor_out = loader_data.scale_factor;
-    }
-
- out:
-  gdk_pixbuf_loader_close (loader, NULL);
-  g_object_unref (loader);
-  g_bytes_unref (bytes);
-
-  return animation;
-}
-
 /**
  * gtk_image_set_from_file: (attributes org.gtk.Method.set_property=file)
  * @image: a `GtkImage`
@@ -681,18 +591,16 @@ load_scalable_with_loader (GtkImage    *image,
  * See [ctor@Gtk.Image.new_from_file] for details.
  */
 void
-gtk_image_set_from_file   (GtkImage    *image,
-                           const char *filename)
+gtk_image_set_from_file (GtkImage    *image,
+                         const char *filename)
 {
-  GdkPixbufAnimation *anim;
   int scale_factor;
-  GdkTexture *texture;
-  GdkPaintable *scaler;
+  GdkPaintable *paintable;
 
   g_return_if_fail (GTK_IS_IMAGE (image));
 
   g_object_freeze_notify (G_OBJECT (image));
-  
+
   gtk_image_clear (image);
 
   if (filename == NULL)
@@ -702,23 +610,19 @@ gtk_image_set_from_file   (GtkImage    *image,
       return;
     }
 
-  anim = load_scalable_with_loader (image, filename, NULL, &scale_factor);
+  scale_factor = gtk_widget_get_scale_factor (GTK_WIDGET (image));
+  paintable = gdk_paintable_new_from_path_scaled (filename, scale_factor);
 
-  if (anim == NULL)
+  if (paintable == NULL)
     {
       gtk_image_set_from_icon_name (image, "image-missing");
       g_object_thaw_notify (G_OBJECT (image));
       return;
     }
 
-  texture = gdk_texture_new_for_pixbuf (gdk_pixbuf_animation_get_static_image (anim));
-  scaler = gtk_scaler_new (GDK_PAINTABLE (texture), scale_factor);
-
-  gtk_image_set_from_paintable (image, scaler);
+  gtk_image_set_from_paintable (image, paintable);
 
-  g_object_unref (scaler);
-  g_object_unref (texture);
-  g_object_unref (anim);
+  g_object_unref (paintable);
 
   image->filename = g_strdup (filename);
 
@@ -765,13 +669,11 @@ out:
  * See [ctor@Gtk.Image.new_from_resource] for details.
  */
 void
-gtk_image_set_from_resource (GtkImage    *image,
-                            const char *resource_path)
+gtk_image_set_from_resource (GtkImage   *image,
+                             const char *resource_path)
 {
-  GdkPixbufAnimation *animation;
-  int scale_factor = 1;
-  GdkTexture *texture;
-  GdkPaintable *scaler;
+  int scale_factor;
+  GdkPaintable *paintable;
 
   g_return_if_fail (GTK_IS_IMAGE (image));
 
@@ -788,34 +690,29 @@ gtk_image_set_from_resource (GtkImage    *image,
   if (resource_is_pixdata (resource_path))
     {
       g_warning ("GdkPixdata format images are not supported, remove the \"to-pixdata\" option from your 
GResource files");
-      animation = NULL;
+      paintable = NULL;
     }
   else
     {
-      animation = load_scalable_with_loader (image, NULL, resource_path, &scale_factor);
+      scale_factor = gtk_widget_get_scale_factor (GTK_WIDGET (image));
+      paintable = gdk_paintable_new_from_resource_scaled (resource_path, scale_factor);
     }
 
-  if (animation == NULL)
+  if (paintable == NULL)
     {
       gtk_image_set_from_icon_name (image, "image-missing");
       g_object_thaw_notify (G_OBJECT (image));
       return;
     }
 
-  texture = gdk_texture_new_for_pixbuf (gdk_pixbuf_animation_get_static_image (animation));
-  scaler = gtk_scaler_new (GDK_PAINTABLE (texture), scale_factor);
-
-  gtk_image_set_from_paintable (image, scaler);
+  gtk_image_set_from_paintable (image, paintable);
 
-  g_object_unref (scaler);
-  g_object_unref (texture);
+  g_object_unref (paintable);
 
   image->resource_path = g_strdup (resource_path);
 
   g_object_notify_by_pspec (G_OBJECT (image), image_props[PROP_RESOURCE]);
 
-  g_object_unref (animation);
-
   g_object_thaw_notify (G_OBJECT (image));
 }
 
diff --git a/gtk/gtkpicture.c b/gtk/gtkpicture.c
index 10607b31ae..6b9fb1c51e 100644
--- a/gtk/gtkpicture.c
+++ b/gtk/gtkpicture.c
@@ -26,9 +26,9 @@
 #include "gtkcssstyleprivate.h"
 #include "gtkintl.h"
 #include "gtkprivate.h"
-#include "gtkscalerprivate.h"
 #include "gtksnapshot.h"
 #include "gtkwidgetprivate.h"
+#include "gdkpixbufutilsprivate.h"
 
 /**
  * GtkPicture:
@@ -560,77 +560,6 @@ gtk_picture_new_for_resource (const char *resource_path)
   return result;
 }
 
-typedef struct {
-  int scale_factor;
-} LoaderData;
-
-static void
-on_loader_size_prepared (GdkPixbufLoader *loader,
-                        int              width,
-                        int              height,
-                        gpointer         user_data)
-{
-  LoaderData *loader_data = user_data;
-  GdkPixbufFormat *format;
-
-  /* Let the regular icon helper code path handle non-scalable pictures */
-  format = gdk_pixbuf_loader_get_format (loader);
-  if (!gdk_pixbuf_format_is_scalable (format))
-    {
-      loader_data->scale_factor = 1;
-      return;
-    }
-
-  gdk_pixbuf_loader_set_size (loader,
-                              width * loader_data->scale_factor,
-                              height * loader_data->scale_factor);
-}
-
-static GdkPaintable *
-load_scalable_with_loader (GFile *file,
-                           int    scale_factor)
-{
-  GdkPixbufLoader *loader;
-  GBytes *bytes;
-  GdkPixbufAnimation *animation;
-  GdkPaintable *result, *scaler;
-  LoaderData loader_data;
-
-  result = NULL;
-
-  loader = gdk_pixbuf_loader_new ();
-  loader_data.scale_factor = scale_factor;
-
-  g_signal_connect (loader, "size-prepared", G_CALLBACK (on_loader_size_prepared), &loader_data);
-
-  bytes = g_file_load_bytes (file, NULL, NULL, NULL);
-  if (bytes == NULL)
-    goto out1;
-
-  if (!gdk_pixbuf_loader_write_bytes (loader, bytes, NULL))
-    goto out2;
-
-  if (!gdk_pixbuf_loader_close (loader, NULL))
-    goto out2;
-
-  animation = gdk_pixbuf_loader_get_animation (loader);
-  if (animation == NULL)
-    goto out2;
-
-  result = GDK_PAINTABLE (gdk_texture_new_for_pixbuf (gdk_pixbuf_animation_get_static_image (animation)));
-  scaler = gtk_scaler_new (result, loader_data.scale_factor);
-  g_object_unref (result);
-  result = scaler;
-
-out2:
-  g_bytes_unref (bytes);
-out1:
-  gdk_pixbuf_loader_close (loader, NULL);
-  g_object_unref (loader);
-
-  return result;
-}
-
 /**
  * gtk_picture_set_file: (attributes org.gtk.Method.set_property=file)
  * @self: a `GtkPicture`
@@ -657,7 +586,7 @@ gtk_picture_set_file (GtkPicture *self,
   g_set_object (&self->file, file);
   g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_FILE]);
 
-  paintable = load_scalable_with_loader (file, gtk_widget_get_scale_factor (GTK_WIDGET (self)));
+  paintable = gdk_paintable_new_from_file_scaled (file, gtk_widget_get_scale_factor (GTK_WIDGET (self)));
   gtk_picture_set_paintable (self, paintable);
   g_clear_object (&paintable);