[gimp] app: make projection chunk size and display render chunk size configurable

[Michael Natterer <mitch src gnome org>]

commit 2c4d5e4391f0578be4de2ea46e7c8b152b7b31af
Author: Michael Natterer <mitch gimp org>
Date:   Wed Jun 4 01:23:41 2014 +0200

    app: make projection chunk size and display render chunk size configurable
    
    Set the GIMP_PROJECTION_CHUNK_SIZE and GIMP_DISPLAY_RENDER_BUF_SIZE
    environment variables to "WIDTHxHEIGHT".

 app/core/gimpprojection.c     |   28 +++++++++++++++++++++++++---
 app/display/gimpdisplayxfer.c |   26 ++++++++++++++++++++++++++
 app/display/gimpdisplayxfer.h |    4 ++--
 3 files changed, 53 insertions(+), 5 deletions(-)
---
diff --git a/app/core/gimpprojection.c b/app/core/gimpprojection.c
index 87abc48..d6b435f 100644
--- a/app/core/gimpprojection.c
+++ b/app/core/gimpprojection.c
@@ -17,6 +17,9 @@
 
 #include "config.h"
 
+#include <stdlib.h>
+#include <string.h>
+
 #include <cairo.h>
 #include <gdk-pixbuf/gdk-pixbuf.h>
 #include <gegl.h>
@@ -44,13 +47,13 @@
 #define GIMP_PROJECTION_IDLE_PRIORITY (G_PRIORITY_HIGH_IDLE + 20 + 1)
 
 /*  chunk size for one iteration of the chunk renderer  */
-#define GIMP_PROJECTION_CHUNK_WIDTH  256
-#define GIMP_PROJECTION_CHUNK_HEIGHT 128
+static gint GIMP_PROJECTION_CHUNK_WIDTH  = 256;
+static gint GIMP_PROJECTION_CHUNK_HEIGHT = 128;
 
 /*  how much time, in seconds, do we allow chunk rendering to take,
  *  aiming for 15fps
  */
-#define GIMP_PROJECTION_CHUNK_TIME 0.0666
+static gint GIMP_PROJECTION_CHUNK_TIME = 0.0666;
 
 
 enum
@@ -176,6 +179,7 @@ gimp_projection_class_init (GimpProjectionClass *klass)
 {
   GObjectClass    *object_class      = G_OBJECT_CLASS (klass);
   GimpObjectClass *gimp_object_class = GIMP_OBJECT_CLASS (klass);
+  const gchar     *env;
 
   projection_signals[UPDATE] =
     g_signal_new ("update",
@@ -200,6 +204,24 @@ gimp_projection_class_init (GimpProjectionClass *klass)
   g_object_class_override_property (object_class, PROP_BUFFER, "buffer");
 
   g_type_class_add_private (klass, sizeof (GimpProjectionPrivate));
+
+  env = g_getenv ("GIMP_DISPLAY_RENDER_BUF_SIZE");
+  if (env)
+    {
+      gint width  = atoi (env);
+      gint height = width;
+
+      env = strchr (env, 'x');
+      if (env)
+        height = atoi (env);
+
+      if (width  > 0 && width  <= 8192 &&
+          height > 0 && height <= 8192)
+        {
+          GIMP_PROJECTION_CHUNK_WIDTH  = width;
+          GIMP_PROJECTION_CHUNK_HEIGHT = height;
+        }
+    }
 }
 
 static void
diff --git a/app/display/gimpdisplayxfer.c b/app/display/gimpdisplayxfer.c
index cb2f4a9..352314e 100644
--- a/app/display/gimpdisplayxfer.c
+++ b/app/display/gimpdisplayxfer.c
@@ -17,6 +17,9 @@
 
 #include "config.h"
 
+#include <stdlib.h>
+#include <string.h>
+
 #include <gegl.h>
 #include <gtk/gtk.h>
 
@@ -52,6 +55,10 @@ struct _GimpDisplayXfer
 };
 
 
+gint GIMP_DISPLAY_RENDER_BUF_WIDTH  = 256;
+gint GIMP_DISPLAY_RENDER_BUF_HEIGHT = 256;
+
+
 static RTreeNode *
 rtree_node_create (RTree      *rtree,
                    RTreeNode **prev,
@@ -203,6 +210,25 @@ gimp_display_xfer_realize (GtkWidget *widget)
 {
   GdkScreen       *screen;
   GimpDisplayXfer *xfer;
+  const gchar     *env;
+
+  env = g_getenv ("GIMP_DISPLAY_RENDER_BUF_SIZE");
+  if (env)
+    {
+      gint width  = atoi (env);
+      gint height = width;
+
+      env = strchr (env, 'x');
+      if (env)
+        height = atoi (env);
+
+      if (width  > 0 && width  <= 8192 &&
+          height > 0 && height <= 8192)
+        {
+          GIMP_DISPLAY_RENDER_BUF_WIDTH  = width;
+          GIMP_DISPLAY_RENDER_BUF_HEIGHT = height;
+        }
+    }
 
   screen = gtk_widget_get_screen (widget);
   xfer = g_object_get_data (G_OBJECT (screen), "gimp-display-xfer");
diff --git a/app/display/gimpdisplayxfer.h b/app/display/gimpdisplayxfer.h
index df1b890..f380b33 100644
--- a/app/display/gimpdisplayxfer.h
+++ b/app/display/gimpdisplayxfer.h
@@ -19,8 +19,8 @@
 #define __GIMP_DISPLAY_XFER_H__
 
 
-#define GIMP_DISPLAY_RENDER_BUF_WIDTH  256
-#define GIMP_DISPLAY_RENDER_BUF_HEIGHT 256
+extern gint GIMP_DISPLAY_RENDER_BUF_WIDTH;
+extern gint GIMP_DISPLAY_RENDER_BUF_HEIGHT;
 
 #define GIMP_DISPLAY_RENDER_MAX_SCALE  4.0