[gtk/wip/chergert/glproto] next: make atlas saving a debug build feature

[Christian Hergert <chergert src gnome org>]

commit e75b4408c456f99dcefc11145f181ffb42a623e4
Author: Christian Hergert <chergert redhat com>
Date:   Tue Feb 23 12:05:38 2021 -0800

    next: make atlas saving a debug build feature

 gsk/next/gskgldriver.c        | 36 +++++++++++++++++++-----------------
 gsk/next/gskgldriverprivate.h |  5 ++++-
 2 files changed, 23 insertions(+), 18 deletions(-)
---
diff --git a/gsk/next/gskgldriver.c b/gsk/next/gskgldriver.c
index f32ebbffd8..8c6223e4f0 100644
--- a/gsk/next/gskgldriver.c
+++ b/gsk/next/gskgldriver.c
@@ -74,23 +74,6 @@ texture_key_equal (gconstpointer v1, gconstpointer v2)
          (!k1->pointer_is_child || memcmp (&k1->parent_rect, &k2->parent_rect, sizeof k1->parent_rect) == 0);
 }
 
-static inline void
-write_atlas_to_png (GskGLTextureAtlas *atlas,
-                    const char        *filename)
-{
-  int stride = cairo_format_stride_for_width (CAIRO_FORMAT_ARGB32, atlas->width);
-  guchar *data = g_malloc (atlas->height * stride);
-  cairo_surface_t *s;
-
-  glBindTexture (GL_TEXTURE_2D, atlas->texture_id);
-  glGetTexImage (GL_TEXTURE_2D, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, data);
-  s = cairo_image_surface_create_for_data (data, CAIRO_FORMAT_ARGB32, atlas->width, atlas->height, stride);
-  cairo_surface_write_to_png (s, filename);
-
-  cairo_surface_destroy (s);
-  g_free (data);
-}
-
 static void
 remove_texture_key_for_id (GskNextDriver *self,
                            guint          texture_id)
@@ -1152,6 +1135,24 @@ gsk_next_driver_lookup_shader (GskNextDriver  *self,
   return program;
 }
 
+#ifdef G_ENABLE_DEBUG
+static void
+write_atlas_to_png (GskGLTextureAtlas *atlas,
+                    const char        *filename)
+{
+  int stride = cairo_format_stride_for_width (CAIRO_FORMAT_ARGB32, atlas->width);
+  guchar *data = g_malloc (atlas->height * stride);
+  cairo_surface_t *s;
+
+  glBindTexture (GL_TEXTURE_2D, atlas->texture_id);
+  glGetTexImage (GL_TEXTURE_2D, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, data);
+  s = cairo_image_surface_create_for_data (data, CAIRO_FORMAT_ARGB32, atlas->width, atlas->height, stride);
+  cairo_surface_write_to_png (s, filename);
+
+  cairo_surface_destroy (s);
+  g_free (data);
+}
+
 void
 gsk_next_driver_save_atlases_to_png (GskNextDriver *self,
                                      const char    *directory)
@@ -1173,6 +1174,7 @@ gsk_next_driver_save_atlases_to_png (GskNextDriver *self,
       g_free (filename);
     }
 }
+#endif
 
 GskGLCommandQueue *
 gsk_next_driver_create_command_queue (GskNextDriver *self,
diff --git a/gsk/next/gskgldriverprivate.h b/gsk/next/gskgldriverprivate.h
index 6531fc9c6c..dd97265538 100644
--- a/gsk/next/gskgldriverprivate.h
+++ b/gsk/next/gskgldriverprivate.h
@@ -173,8 +173,11 @@ GskGLProgram      *gsk_next_driver_lookup_shader         (GskNextDriver        *
                                                           GskGLShader          *shader,
                                                           GError              **error);
 GskGLTextureAtlas *gsk_next_driver_create_atlas          (GskNextDriver        *self);
-void              gsk_next_driver_save_atlases_to_png    (GskNextDriver        *self,
+
+#ifdef G_ENABLE_DEBUG
+void               gsk_next_driver_save_atlases_to_png   (GskNextDriver        *self,
                                                           const char           *directory);
+#endif
 
 static inline GskGLTexture *
 gsk_next_driver_get_texture_by_id (GskNextDriver *self,