From 2b1649ef3fbd3801706be5d529daa523e16e49ea Mon Sep 17 00:00:00 2001
From: Nikita <102851041+HyperNiki@users.noreply.github.com>
Date: Sat, 14 May 2022 10:29:24 +0300
Subject: implement the grayscale test

---
 UefiMonitorTest/UefiMonitorTestStrings.uni | 11 +++++
 UefiMonitorTest/tests/Grayscale.c          | 64 +++++++++++++++++++++++++++++-
 2 files changed, 74 insertions(+), 1 deletion(-)

diff --git a/UefiMonitorTest/UefiMonitorTestStrings.uni b/UefiMonitorTest/UefiMonitorTestStrings.uni
index 3d99dab..60c519c 100644
--- a/UefiMonitorTest/UefiMonitorTestStrings.uni
+++ b/UefiMonitorTest/UefiMonitorTestStrings.uni
@@ -95,3 +95,14 @@
                                                               "\n"
                                                               "Color%c: %s\n"
                                                               "Steps%c: %d\n"
+
+//          Test "Grayscale"
+
+#string STR_GRAYSCALE_TITLE                   #language en-US "GRAYSCALE"
+
+#string STR_GRAYSCALE_MSG                     #language en-US "Assess the uniformity of the image using various\n"
+                                                              "grayscales. The brightness should be equally\n"
+                                                              "distributed across the entire image, and the image\n"
+                                                              "shouldn't have any colorful areas.\n"
+                                                              "\n"
+                                                              "Gray tone: %d\n"
diff --git a/UefiMonitorTest/tests/Grayscale.c b/UefiMonitorTest/tests/Grayscale.c
index eb1bf9a..7b41414 100644
--- a/UefiMonitorTest/tests/Grayscale.c
+++ b/UefiMonitorTest/tests/Grayscale.c
@@ -1,11 +1,33 @@
+#include <Library/DebugLib.h>
+#include <Library/HiiLib.h>
+#include <Library/MemoryAllocationLib.h>
+
 #include "Grayscale.h"
 
+STATIC UINT32 CurrentGrayTone = 50;
+
 VOID
 GrayscaleTestInit (
   IN UMT_CONTEXT *Ctx
   )
 {
+  GRAPHICS_PIXEL_COLOR ColorOutput = { 0x00 };
+  GRAPHICS_CONTEXT *Graphics = Ctx->Graphics;
+
+  ColorOutput.Red   = (CurrentGrayTone * 255) / 100;
+  ColorOutput.Green = (CurrentGrayTone * 255) / 100;
+  ColorOutput.Blue  = (CurrentGrayTone * 255) / 100;
 
+  PutRect (Graphics,
+           0,
+           0,
+           Graphics->Width,
+           Graphics->Height,
+           &ColorOutput);
+
+  if (Ctx->ShowTip) {
+    GrayscaleTestTip (Ctx);
+  }
 }
 
 VOID
@@ -21,14 +43,43 @@ GrayscaleTestTip (
   IN UMT_CONTEXT *Ctx
   )
 {
+  GRAPHICS_CONTEXT *Graphics;
+
+  Graphics = Ctx->Graphics;
 
+  if (Ctx->ShowTip == FALSE) {
+    // Restore
+    GrayscaleTestInit (Ctx);
+    return;
+  }
+
+  DrawRectWithBorder (Graphics,
+                      15,
+                      Graphics->Height - 15 - 134,
+                      430, Graphics->Height - 15,
+                      3,
+                      &gUmtColors[UMT_COLOR_WHITE].Color,
+                      &gUmtColors[UMT_COLOR_NAVY].Color);
+
+  DrawHiiStringF (Graphics,
+                  25,
+                  Graphics->Height - 15 - 124,
+                  &gUmtColors[UMT_COLOR_NAVY].Color,
+                  STRING_TOKEN (STR_GRAYSCALE_TITLE), gUmtHiiHandle);
+
+  DrawHiiStringF (Graphics,
+                  25,
+                  Graphics->Height - 15 - 104,
+                  &gUmtColors[UMT_COLOR_BLACK].Color,
+                  STRING_TOKEN (STR_GRAYSCALE_MSG), gUmtHiiHandle,
+                  CurrentGrayTone);
 }
 
 VOID
 GrayscaleTestChangeParam (
   IN  UMT_CONTEXT *Ctx,
   IN  INT8        ParamStep
-  )
+)
 {
 
 }
@@ -39,5 +90,16 @@ GrayscaleTestChangeValue (
   IN  INT8        ValueStep
   )
 {
+  if (CurrentGrayTone == 5 && ValueStep < 0) {
+    return;
+  } else {
+    CurrentGrayTone += ValueStep * 5;
+    if (CurrentGrayTone > 95)
+    {
+      CurrentGrayTone = 95;
+      return;
+    }
+  }
 
+  GrayscaleTestInit (Ctx);
 }
-- 
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