Enable scaling to fit various screen resolutionseel_5.1.0eel_5.0.3eel/5.1.0eel/5.0.35.1.05.0.3eel

Since the AGL HomeScreen of CES2018 assumes that the screen
resolution is 1080x1920px, the graphics of it partially
corrupted with others.

To fix this issue, now the AGL window manager automatically
scales size of HomeScreen to fit the resolution of the display.

By default, this scaling keeps HomeScreen's original aspect
rate (9:16). To ignore it, set the environment variable,
'HMI_SCALING_IGNORE_ASPECT'.
(E.g. set it in any file under /etc/afm/unit.env.d/)

Bug-AGL: SPEC-1138

Change-Id: Id11a07560fe254712aaab42018bfb4d1d87ad1df
Signed-off-by: Tadao Tanikawa <tanikawa.tadao@jp.panasonic.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/src/util.cpp b/src/util.cpp
index 2ae856f..1fb6ac8 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -37,3 +37,30 @@ unique_fd::~unique_fd() {
       close(this->fd);
    }
 }
+
+void rectangle::scale(int to_w, int to_h, bool keep_aspect)
+{
+  if (!keep_aspect) {
+    w = to_w;
+    h = to_h;
+    return;
+  }
+
+  int64_t resized_w = int64_t(to_h) * int64_t(w) / int64_t(h);
+
+  if (resized_w <= to_w) {
+    /* use aspect by height */
+    w = resized_w;
+    h = to_h;
+  } else {
+    /* use aspect by width */
+    w = to_h;
+    h = int64_t(to_w) * int64_t(h) / int64_t(w);
+  }
+}
+
+void rectangle::center(int outer_w, int outer_h)
+{
+  x = (outer_w - w) / 2;
+  y = (outer_h - h) / 2;
+}