From 0dcb2830c69aba7f1a2e3cf52550a7eb4b643978 Mon Sep 17 00:00:00 2001
From: ZXCLI <ww85508050@gmail.com>
Date: Wed, 19 Aug 2026 15:46:21 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D=E8=B0=83=E8=89=B2=E6=9D=BF?=
 =?UTF-8?q?=20BGR/RGB=20=E9=A1=BA=E5=BA=8F=EF=BC=9Arender=20=E8=BE=93?=
 =?UTF-8?q?=E5=87=BA=E6=A0=87=E5=87=86=20RGB24=EF=BC=88=E5=AE=98=E6=96=B9?=
 =?UTF-8?q?=20palette=20=E4=B8=BA=20BGR=20=E5=AD=98=E5=82=A8=EF=BC=89?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- mag160c_render_frame 之前把 palette[gv][0]=B 直接写入 out_rgb[0]，
  导致 R/B 互换，高温区域显示为蓝色
- 改为 out_rgb = {palette[2], palette[1], palette[0]} 标准 RGB24
- linux_demo 的 BMP 输出相应改为写回 BGR（BMP 原生顺序）
- 实测：最热像素 (255,255,150) 亮黄白，低温区域蓝黑，色温方向正确
---
 build-artifacts/mag160c_demo3.exe | 2 +-
 csdk/src/mag160c_render.c         | 6 +++---
 csdk/tools/mag160c_linux_demo.c   | 9 +++++++--
 3 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/build-artifacts/mag160c_demo3.exe b/build-artifacts/mag160c_demo3.exe
index cd79829..2cc60e2 100644
--- a/build-artifacts/mag160c_demo3.exe
+++ b/build-artifacts/mag160c_demo3.exe
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:0a85090dc4c671f8686097fca408b7df98f5105aca6c399a21c91b947cf61699
+oid sha256:7871c752e49f5f5af71920ac63d072997008a5781f6aea0e35eb1eb1d4744441
 size 140785
diff --git a/csdk/src/mag160c_render.c b/csdk/src/mag160c_render.c
index 9ba9e89..dfb34a7 100644
--- a/csdk/src/mag160c_render.c
+++ b/csdk/src/mag160c_render.c
@@ -626,12 +626,12 @@ mag160c_error_t mag160c_render_frame(mag160c_render_t *r, const uint8_t *frame,
     if (r->post_gray_cb)
         r->post_gray_cb(r->post_gray_user, r->gray160);
     upscale2x(r);
-    /* palette colorize 320x240 */
+    /* palette colorize 320x240 (palette is B,G,R -> swap to RGB24 out) */
     for (int i = 0; i < r->npix * 4; ++i) {
         unsigned char gv = r->gray320[i];
-        out_rgb[i * 3 + 0] = mag160c_official_palette256[gv][0];
+        out_rgb[i * 3 + 0] = mag160c_official_palette256[gv][2];
         out_rgb[i * 3 + 1] = mag160c_official_palette256[gv][1];
-        out_rgb[i * 3 + 2] = mag160c_official_palette256[gv][2];
+        out_rgb[i * 3 + 2] = mag160c_official_palette256[gv][0];
     }
     return MAG160C_OK;
 }
diff --git a/csdk/tools/mag160c_linux_demo.c b/csdk/tools/mag160c_linux_demo.c
index 30e5183..def7ff3 100644
--- a/csdk/tools/mag160c_linux_demo.c
+++ b/csdk/tools/mag160c_linux_demo.c
@@ -102,8 +102,13 @@ static void save_bmp(const char *path, const uint8_t *rgb, int w, int h) {
     FILE *f = fopen(path, "wb");
     if (!f) return;
     fwrite(bmp, 1, 54, f);
-    for (int y = h - 1; y >= 0; --y)
-        fwrite(rgb + (size_t)y * w * 3, 1, (size_t)w * 3, f);
+    for (int y = h - 1; y >= 0; --y) {
+        const uint8_t *row = rgb + (size_t)y * w * 3;
+        for (int x = 0; x < w; ++x) {
+            uint8_t bgr[3] = { row[x * 3 + 2], row[x * 3 + 1], row[x * 3] };
+            fwrite(bgr, 1, 3, f);
+        }
+    }
     fclose(f);
 }