[coreboot-gerrit] Change in libgfxinit[master]: gfx_test: Add top marker for rotated framebuffers

[Nico Huber (Code Review)]

Nico Huber has uploaded this change for review. ( https://review.coreboot.org/22714

Change subject: gfx_test: Add top marker for rotated framebuffers
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gfx_test: Add top marker for rotated framebuffers

Mark the top with an arrow. Desperately needs anti aliasing.

Change-Id: Ide0e06c29fefc8b5288714d53ee9fa15df2d5452
Signed-off-by: Nico Huber 
---
M gfxtest/hw-gfx-gma-gfx_test.adb
1 file changed, 17 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/libgfxinit refs/changes/14/22714/1

diff --git a/gfxtest/hw-gfx-gma-gfx_test.adb b/gfxtest/hw-gfx-gma-gfx_test.adb
index e0ad71f..514e60f 100644
--- a/gfxtest/hw-gfx-gma-gfx_test.adb
+++ b/gfxtest/hw-gfx-gma-gfx_test.adb
@@ -160,6 +160,19 @@
       -- We have pixel offset wheras the framebuffer has a byte offset
       Offset_Y : Natural := Natural (Framebuffer.Offset / 4);
       Offset   : Natural;
+
+      function Top_Test (X, Y : Natural) return Boolean
+      is
+         C     : constant Natural := Natural (Framebuffer.Width) / 2;
+         S_Y   : constant Natural := 3 * Y / 2;
+         Left  : constant Integer := X - C + S_Y;
+         Right : constant Integer := X - C - S_Y;
+      begin
+         return
+            Y < 12 and
+            ((-1 <= Left and Left <= 0) or
+             (0 <= Right and Right <= 1));
+      end Top_Test;
    begin
       for Y in 0 .. Natural (Framebuffer.Height) - 1 loop
          Offset := Offset_Y;
@@ -168,6 +181,10 @@
                (Y < 32 or Y >= Natural (Framebuffer.Height) - 32)
             then
                P := Corner_Fill (X, Y, Framebuffer, Pipe);
+            elsif Framebuffer.Rotation /= No_Rotation and then
+                  Top_Test (X, Y)
+            then
+               P := White;
             elsif Y mod 16 = 0 or X mod 16 = 0 then
                P := Black;
             else