[mutter] renderer/native: remove meta_renderer_native_gles3_read_pixels

[Ray Strode <halfline src gnome org>]

commit 1c044a8fa038e47c598ea19b91ca88beb770b0f2
Author: Pekka Paalanen <pekka paalanen collabora co uk>
Date:   Tue Oct 16 14:18:46 2018 +0300

    renderer/native: remove meta_renderer_native_gles3_read_pixels
    
    It is unused.

 src/backends/native/meta-renderer-native-gles3.c | 22 ----------------------
 src/backends/native/meta-renderer-native-gles3.h |  7 -------
 2 files changed, 29 deletions(-)
---
diff --git a/src/backends/native/meta-renderer-native-gles3.c 
b/src/backends/native/meta-renderer-native-gles3.c
index 71a440832..7afea8648 100644
--- a/src/backends/native/meta-renderer-native-gles3.c
+++ b/src/backends/native/meta-renderer-native-gles3.c
@@ -238,25 +238,3 @@ meta_renderer_native_gles3_blit_shared_bo (MetaEgl        *egl,
 
   return TRUE;
 }
-
-void
-meta_renderer_native_gles3_read_pixels (MetaEgl   *egl,
-                                        MetaGles3 *gles3,
-                                        int        width,
-                                        int        height,
-                                        uint8_t   *target_data,
-                                        int        target_stride_bytes)
-{
-  int y;
-
-  g_assert (target_stride_bytes >= 0);
-
-  GLBAS (gles3, glFinish, ());
-
-  for (y = 0; y < height; y++)
-    {
-      GLBAS (gles3, glReadPixels, (0, height - y, width, 1,
-                                   GL_RGBA, GL_UNSIGNED_BYTE,
-                                   target_data + y * target_stride_bytes));
-    }
-}
diff --git a/src/backends/native/meta-renderer-native-gles3.h 
b/src/backends/native/meta-renderer-native-gles3.h
index ecd0d29de..4e7324c8d 100644
--- a/src/backends/native/meta-renderer-native-gles3.h
+++ b/src/backends/native/meta-renderer-native-gles3.h
@@ -37,11 +37,4 @@ gboolean meta_renderer_native_gles3_blit_shared_bo (MetaEgl       *egl,
                                                     struct gbm_bo *shared_bo,
                                                     GError       **error);
 
-void meta_renderer_native_gles3_read_pixels (MetaEgl   *egl,
-                                             MetaGles3 *gles3,
-                                             int        width,
-                                             int        height,
-                                             uint8_t   *target_data,
-                                             int        target_stride_bytes);
-
 #endif /* META_RENDERER_NATIVE_GLES3_H */