From e32e65f7f87e75482c037e88c28ed7391461c25f Mon Sep 17 00:00:00 2001
From: Joursoir <chat@joursoir.net>
Date: Sun, 27 Mar 2022 10:12:24 +0300
Subject: main: support different pixel formats

---
 UefiMonitorTest/UefiMonitorTest.c | 60 ++++++++++++++++++++++++++++++++-------
 UefiMonitorTest/UefiMonitorTest.h | 14 +++++++++
 2 files changed, 63 insertions(+), 11 deletions(-)

(limited to 'UefiMonitorTest')

diff --git a/UefiMonitorTest/UefiMonitorTest.c b/UefiMonitorTest/UefiMonitorTest.c
index 8dda9b7..084a8b9 100644
--- a/UefiMonitorTest/UefiMonitorTest.c
+++ b/UefiMonitorTest/UefiMonitorTest.c
@@ -12,6 +12,14 @@
 
 #include "UefiMonitorTest.h"
 
+CONST EFI_PIXEL_BITMASK mRgbPixelMasks = {
+  0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
+};
+
+CONST EFI_PIXEL_BITMASK mBgrPixelMasks = {
+  0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000
+};
+
 STATIC
 VOID
 PrepareGraphicsInfo (
@@ -19,31 +27,61 @@ PrepareGraphicsInfo (
   IN EFI_GRAPHICS_OUTPUT_PROTOCOL *Gop
   )
 {
+  CONST EFI_PIXEL_BITMASK  *BitMask;
+  UINT32                   PixelWidth;
+  INT8                     PixelShl[4];
+  INT8                     PixelShr[4];
+
   ASSERT (Graphics != NULL);
   ASSERT (Gop != NULL);
 
-  Graphics->Gop         = Gop;
-  Graphics->FrontBuffer = (UINT8 *)Gop->Mode->FrameBufferBase;
-  Graphics->BufferSize  = Gop->Mode->FrameBufferSize;
-  Graphics->BackBuffer  = AllocateCopyPool (Graphics->BufferSize, Graphics->FrontBuffer);
-  ASSERT (Graphics->BackBuffer != NULL);
-  Graphics->Width       = Gop->Mode->Info->HorizontalResolution;
-  Graphics->Height      = Gop->Mode->Info->VerticalResolution;
-  Graphics->PixelWidth  = 4; // A pixel is 32-bits
-  Graphics->Pitch       = Graphics->PixelWidth * Gop->Mode->Info->PixelsPerScanLine;
+  switch (Gop->Mode->Info->PixelFormat) {
+    case PixelRedGreenBlueReserved8BitPerColor:
+      BitMask = &mRgbPixelMasks;
+      break;
+
+    case PixelBlueGreenRedReserved8BitPerColor:
+      BitMask = &mBgrPixelMasks;
+      break;
+
+    case PixelBitMask:
+      BitMask = &Gop->Mode->Info->PixelInformation;
+      break;
+
+    case PixelBltOnly:
+      ASSERT (FALSE);
+      //return RETURN_UNSUPPORTED;
+
+    default:
+      ASSERT (FALSE);
+      // return RETURN_INVALID_PARAMETER;
+  }
 
   DEBUG ((
     DEBUG_INFO,
     "GOP information:\n"
     "Mode: %d\n"
-    "Support a physical frame buffer: %s\n"
     "Framebuffer address, size: %x, %d\n"
     "Screen width x height: %d x %d\n",
     Gop->Mode->Mode,
-    (Gop->Mode->Info->PixelFormat == PixelBltOnly) ? L"NO" : L"YES",
     Gop->Mode->FrameBufferBase, Gop->Mode->FrameBufferSize,
     Gop->Mode->Info->HorizontalResolution, Gop->Mode->Info->VerticalResolution
     ));
+
+  ParseGraphicsPixelFormat (BitMask, &PixelWidth, PixelShl, PixelShr);
+
+  Graphics->Gop         = Gop;
+  Graphics->FrontBuffer = (UINT8 *)Gop->Mode->FrameBufferBase;
+  Graphics->BufferSize  = Gop->Mode->FrameBufferSize;
+  Graphics->BackBuffer  = AllocateCopyPool (Graphics->BufferSize, Graphics->FrontBuffer);
+  ASSERT (Graphics->BackBuffer != NULL);
+  Graphics->Width       = Gop->Mode->Info->HorizontalResolution;
+  Graphics->Height      = Gop->Mode->Info->VerticalResolution;
+  CopyMem (&Graphics->PixelMasks, BitMask, sizeof (*BitMask));
+  CopyMem (Graphics->PixelShl, PixelShl, sizeof (PixelShl));
+  CopyMem (Graphics->PixelShr, PixelShr, sizeof (PixelShr));
+  Graphics->PixelWidth  = PixelWidth;
+  Graphics->Pitch       = Graphics->PixelWidth * Gop->Mode->Info->PixelsPerScanLine;
 }
 
 STATIC
diff --git a/UefiMonitorTest/UefiMonitorTest.h b/UefiMonitorTest/UefiMonitorTest.h
index 97ada85..eb49249 100644
--- a/UefiMonitorTest/UefiMonitorTest.h
+++ b/UefiMonitorTest/UefiMonitorTest.h
@@ -28,6 +28,20 @@ typedef struct {
   ///
   UINT32                                  Height;
   ///
+  /// Bit-mask defines what bits are used for different colors.
+  ///
+  EFI_PIXEL_BITMASK                       PixelMasks;
+  ///
+  /// Amount of bits to shift left.
+  /// R-G-B-Rsvd
+  ///
+  INT8                                    PixelShl[4];
+  ///
+  /// Amount of bits to shift right.
+  /// R-G-B-Rsvd
+  ///
+  INT8                                    PixelShr[4];
+  ///
   /// The size of pixel color in bytes.
   ///
   UINT32                                  PixelWidth;
-- 
cgit v1.2.3-18-g5258