From ee5932ec51cd4a733eb0987fe45af9c7444d9581 Mon Sep 17 00:00:00 2001
From: Mistivia <i@mistivia.com>
Date: Thu, 5 Jun 2025 19:10:55 +0800
Subject: bmp init

---
 Main.hs | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 Main.hs

diff --git a/Main.hs b/Main.hs
new file mode 100644
index 0000000..e433b09
--- /dev/null
+++ b/Main.hs
@@ -0,0 +1,53 @@
+import Data.Array.MArray
+import Data.Array.IO
+import System.IO
+import qualified Data.ByteString.Builder as B
+
+data Picture = Picture
+    { picWidth :: Int
+    , picHeight :: Int
+    , picArray :: IOUArray Int Float}
+
+newPicture :: Int -> Int -> IO Picture
+newPicture w h = do {
+    arr <- newArray (0, w * h * 3) 0.0;
+    return $ Picture w h arr;
+}
+
+setPixel :: (Int, Int) -> (Float, Float, Float) -> Picture -> IO ()
+setPixel (x, y) (r, g, b) pic = let {
+    idx = (y * picWidth pic + x) * 3;
+} in do {
+    writeArray (picArray pic) idx r;
+    writeArray (picArray pic) (idx+1) g;
+    writeArray (picArray pic) (idx+2) b;
+}
+
+outputPicture :: String -> Picture -> IO ()
+outputPicture fileName pic = withBinaryFile fileName WriteMode $ \h -> let {
+    fileLength = undefined;
+    width = undefined;
+    height = undefined;
+    imageSize = undefined;
+} in do {
+    B.hPutBuilder h $ mconcat 
+        [ -- header
+          B.word16LE 0x4d42
+        , B.word32LE fileLength
+        , B.word32LE 0
+        , B.word32LE 54
+          -- info
+        , B.word32LE 40
+        , B.int32LE width
+        , B.int32LE height
+        , B.word16LE 1
+        , B.word16LE 24
+        , B.word32LE 0 -- BI_RGB
+        , B.word32LE imageSize
+        , B.word32LE 0
+        , B.word32LE 0
+        , B.word32LE 0
+        , B.word32LE 0
+        ];
+}
+
-- 
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