[mutter] ClutterStageView: Always blit full texture on full onscreen framebuffer

[Jonas Ådahl <jadahl src gnome org>]

commit b78b8c9578977f65a1fefb406a1b6178a251cb4f
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Sep 9 12:51:14 2016 +0800

    ClutterStageView: Always blit full texture on full onscreen framebuffer
    
    When blitting an offscreen onto an onscreen, the whole offscreen should
    always be drawn on the whole onscreen. Thus, don't try to convert
    between coordinate spaces, just draw the whole offscreen on the whole
    onscreen.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=770672

 clutter/clutter/clutter-stage-view.c |   46 ++-------------------------------
 1 files changed, 3 insertions(+), 43 deletions(-)
---
diff --git a/clutter/clutter/clutter-stage-view.c b/clutter/clutter/clutter-stage-view.c
index a8b1d09..2b89bb2 100644
--- a/clutter/clutter/clutter-stage-view.c
+++ b/clutter/clutter/clutter-stage-view.c
@@ -115,36 +115,12 @@ clutter_stage_view_invalidate_offscreen_blit_pipeline (ClutterStageView *view)
   g_clear_pointer (&priv->pipeline, cogl_object_unref);
 }
 
-static void
-transform_rect_to_onscreen (ClutterStageView        *view,
-                            const cairo_rectangle_t *rect,
-                            cairo_rectangle_t       *rect_out)
-{
-  float x1, y1, x2, y2;
-
-  x1 = rect->x;
-  y1 = rect->y;
-  clutter_stage_view_transform_to_onscreen (view, &x1, &y1);
-
-  x2 = rect->x + rect->width;
-  y2 = rect->y + rect->height;
-  clutter_stage_view_transform_to_onscreen (view, &x2, &y2);
-
-  *rect_out = (cairo_rectangle_t) {
-    .x = MIN (x1, x2),
-    .y = MIN (y1, y2),
-    .width = ABS (x2 - x1),
-    .height = ABS (y2 - y1)
-  };
-}
-
 void
 clutter_stage_view_blit_offscreen (ClutterStageView            *view,
                                    const cairo_rectangle_int_t *rect)
 {
   ClutterStageViewPrivate *priv =
     clutter_stage_view_get_instance_private (view);
-  cairo_rectangle_t texture_rect, onscreen_rect;
   CoglMatrix matrix;
 
   clutter_stage_view_ensure_offscreen_blit_pipeline (view);
@@ -158,25 +134,9 @@ clutter_stage_view_blit_offscreen (ClutterStageView            *view,
   cogl_matrix_scale (&matrix, 2, -2, 0);
   cogl_framebuffer_set_projection_matrix (priv->framebuffer, &matrix);
 
-  texture_rect = (cairo_rectangle_t) {
-    .x = (double) rect->x / cogl_framebuffer_get_width (priv->offscreen),
-    .y = (double) rect->y / cogl_framebuffer_get_height (priv->offscreen),
-    .width = (double) rect->width / cogl_framebuffer_get_width (priv->offscreen),
-    .height = (double) rect->height / cogl_framebuffer_get_height (priv->offscreen)
-  };
-
-  transform_rect_to_onscreen (view, &texture_rect, &onscreen_rect);
-
-  cogl_framebuffer_draw_textured_rectangle (priv->framebuffer,
-                                            priv->pipeline,
-                                            onscreen_rect.x,
-                                            onscreen_rect.y,
-                                            onscreen_rect.x + onscreen_rect.width,
-                                            onscreen_rect.y + onscreen_rect.height,
-                                            texture_rect.x,
-                                            texture_rect.y,
-                                            texture_rect.x + texture_rect.width,
-                                            texture_rect.y + texture_rect.height);
+  cogl_framebuffer_draw_rectangle (priv->framebuffer,
+                                   priv->pipeline,
+                                   0, 0, 1, 1);
 
   cogl_framebuffer_pop_matrix (priv->framebuffer);
 }