feat: DEAICUP lotus panic screen + F2 fbcon abstraction

- panic screen now draws embedded ohMyLogo.png (384px RGBA, gen_panic_logo.py); background color sampled from image corners so screen bg matches logo bg - F2: include/utsm/fbcon.h unified framebuffer console (pixel/blend/fill/rgba-image/text with FBCON_HAVE_FONT opt-in); panic.c migrated onto it - build.ps1 regenerates panic_logo_data.inc when ohMyLogo.png changes
2026-10-01 23:50:04 +08:00
parent e4307ff0ec
commit 6e44fa5df7
13 changed files with 646 additions and 170 deletions
@@ -0,0 +1,122 @@
+#ifndef UTSM_FBCON_H
+#define UTSM_FBCON_H
+
+#include <utsm/types.h>
+#include "../arch/x86_64/limine.h"
+
+/* boot_modules.c 提供（Limine framebuffer 请求） */
+extern volatile struct limine_framebuffer_request g_fb_request;
+
+/* ===================================================================
+ *  F2: 统一帧缓冲控制台抽象（fbcon）
+ *
+ *  让"疯要有画面"不绑定任何一个驱动：
+ *    - 崩溃路径（panic.c）：驱动可能已挂，直接用 Limine fb
+ *    - 早期控制台 / 任何需要直绘的 UTSM 内部路径
+ *
+ *  32bpp XRGB，全部带边界检查，无堆依赖。
+ *  文本渲染需要先 include 字库（g_ascii/g_ascii_w/g_ascii_h，
+ *  见 kernel/panic_font.inc）。
+ * =================================================================== */
+
+typedef struct {
+    u32 *fb;
+    u64  w, h, pitch;
+} fbc_ctx;
+
+/* 从 Limine framebuffer 初始化；失败 -1（无 fb / 非 32bpp） */
+static inline int fbc_init(fbc_ctx *c) {
+    if (!g_fb_request.response || g_fb_request.response->framebuffer_count == 0)
+        return -1;
+    struct limine_framebuffer *fb = g_fb_request.response->framebuffers[0];
+    if (fb->bpp < 32 || !fb->address) return -1;
+    c->fb = (u32 *)fb->address;
+    c->w = fb->width;
+    c->h = fb->height;
+    c->pitch = fb->pitch;
+    return 0;
+}
+
+static inline void fbc_pixel(fbc_ctx *c, i64 x, i64 y, u32 col) {
+    if (x < 0 || (u64)x >= c->w || y < 0 || (u64)y >= c->h) return;
+    *(u32 *)((u8 *)c->fb + (u64)y * c->pitch + (u64)x * 4) = col;
+}
+
+static inline u32 fbc_pixel_read(fbc_ctx *c, i64 x, i64 y) {
+    if (x < 0 || (u64)x >= c->w || y < 0 || (u64)y >= c->h) return 0;
+    return *(u32 *)((u8 *)c->fb + (u64)y * c->pitch + (u64)x * 4);
+}
+
+/* alpha 混合（0–255） */
+static inline u32 fbc_blend(u32 bg, u32 fg, u32 alpha) {
+    u32 na = 256 - alpha;
+    u32 r = (((bg >> 16) & 0xFF) * na + ((fg >> 16) & 0xFF) * alpha) >> 8;
+    u32 g = (((bg >> 8) & 0xFF) * na + ((fg >> 8) & 0xFF) * alpha) >> 8;
+    u32 b = ((bg & 0xFF) * na + (fg & 0xFF) * alpha) >> 8;
+    return 0xFF000000u | (r << 16) | (g << 8) | b;
+}
+
+static inline void fbc_fill_rect(fbc_ctx *c, i64 x, i64 y, i64 w, i64 h, u32 col) {
+    for (i64 r = 0; r < h; r++)
+        for (i64 cx = 0; cx < w; cx++)
+            fbc_pixel(c, x + cx, y + r, col);
+}
+
+/* 全屏纯色（背景色填充） */
+static inline void fbc_fill_bg(fbc_ctx *c, u32 col) {
+    for (u64 y = 0; y < c->h; y++) {
+        u32 *line = (u32 *)((u8 *)c->fb + y * c->pitch);
+        for (u64 x = 0; x < c->w; x++) line[x] = col;
+    }
+}
+
+/* RGBA8888 图像绘制（半透明像素与已绘背景混合） */
+static inline void fbc_draw_rgba(fbc_ctx *c, const unsigned char *d,
+                                 i64 w, i64 h, i64 x, i64 y) {
+    for (i64 r = 0; r < h; r++) {
+        for (i64 cx = 0; cx < w; cx++) {
+            const unsigned char *px4 = d + ((u64)r * w + (u64)cx) * 4;
+            u32 a = px4[3];
+            if (a < 8) continue;
+            u32 col = 0xFF000000u | ((u32)px4[0] << 16) | ((u32)px4[1] << 8) | px4[2];
+            if (a < 250) col = fbc_blend(fbc_pixel_read(c, x + cx, y + r), col, a);
+            fbc_pixel(c, x + cx, y + r, col);
+        }
+    }
+}
+
+/* ---- 文本 ----
+ * 字库（g_ascii / g_ascii_w / g_ascii_h）由使用方先 include（如
+ * kernel/panic_font.inc），并定义 FBCON_HAVE_FONT 后再包含本头文件。 */
+#ifdef FBCON_HAVE_FONT
+
+static inline void fbc_char(fbc_ctx *c, char ch, i64 x, i64 y, u32 fg) {
+    u32 idx = (u32)ch - 32;
+    if (idx > 94) idx = 0;
+    const u8 *g = g_ascii[idx];
+    for (i64 r = 0; r < g_ascii_h; r++)
+        for (i64 cc = 0; cc < g_ascii_w; cc++) {
+            u8 a = g[r * g_ascii_w + cc];
+            if (a < 24) continue;
+            fbc_pixel(c, x + cc, y + r, fg);
+        }
+}
+
+static inline void fbc_string(fbc_ctx *c, const char *s, i64 x, i64 y, u32 fg) {
+    i64 cx = x;
+    while (*s) {
+        fbc_char(c, *s, cx, y, fg);
+        cx += g_ascii_w;
+        s++;
+    }
+}
+
+static inline void fbc_string_center(fbc_ctx *c, const char *s, i64 y, u32 fg) {
+    i64 w = 0;
+    for (const char *q = s; *q; q++) w += g_ascii_w;
+    fbc_string(c, s, ((i64)c->w - w) / 2, y, fg);
+}
+
+#endif /* FBCON_HAVE_FONT */
+
+#endif /* UTSM_FBCON_H */