feat: 添加 Linux 预览后端和 Notes 应用预览版本

- 创建 desktop_app_linux.h 作为跨平台后端抽象层 - 创建 notes_preview.c 使用 5x7 位图字体渲染 - 添加 Makefile.linux 构建脚本 - 添加 README_LINUX_PREVIEW.md 使用说明- 修复键盘映射、字符渲染、文本输入显示等问题
2026-08-05 13:15:46 +08:00
parent 86df253a32
commit 6287513794
31 changed files with 1122 additions and 449 deletions
@@ -0,0 +1,489 @@
+/* notes_preview.c — Notes 应用的 Linux 预览版本
+ *
+ * 这个文件可以在 Linux 上编译预览 UI。
+ * 使用自定义位图字体渲染字符。
+ * 
+ * 编译方式：
+ *   gcc -o notes_preview notes_preview.c -I.. -lSDL2
+ */
+
+#define DA_LINUX_PREVIEW
+#include "../desktop_app_linux.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <ctype.h>
+
+/* 全局状态 */
+static da_app_context g_ac;
+static int g_running = 1;
+
+/* 文本内容 */
+static char g_lines[512][256];
+static int g_line_count = 0;
+static int g_current_line = 0;
+static int g_current_col = 0;
+static int g_scroll_top = 0;
+static int g_visible_rows;
+
+/*  5x7 位图字体 (ASCII 32-126, 共95 个字符) */
+static const unsigned char font_5x7[95][5] = {
+    /* 0x20 space */
+    {0x00, 0x00, 0x00, 0x00, 0x00},
+    /* 0x21 ! */
+    {0x00, 0x00, 0x30, 0x30, 0x00},
+    /* 0x22 " */
+    {0x30, 0x30, 0x00, 0x00, 0x00},
+    /* 0x23 # */
+    {0x18, 0x7E, 0x18, 0x7E, 0x18},
+    /* 0x24 $ */
+    {0x0C, 0x36, 0x6C, 0x36, 0x0C},
+    /* 0x25 % */
+    {0x60, 0x9C, 0x18, 0x36, 0x60},
+    /* 0x26 & */
+    {0x30, 0x7E, 0x1C, 0x36, 0x70},
+    /* 0x27 ' */
+    {0x30, 0x30, 0x00, 0x00, 0x00},
+    /* 0x28 ( */
+    {0x0C, 0x18, 0x30, 0x18, 0x0C},
+    /* 0x29 ) */
+    {0x30, 0x18, 0x0C, 0x18, 0x30},
+    /* 0x2A * */
+    {0x00, 0x18, 0x7E, 0x18, 0x00},
+    /* 0x2B + */
+    {0x00, 0x18, 0x7E, 0x18, 0x00},
+    /* 0x2C , */
+    {0x00, 0x00, 0x00, 0x30, 0x30},
+    /* 0x2D - */
+    {0x00, 0x00, 0x7E, 0x00, 0x00},
+    /* 0x2E . */
+    {0x00, 0x00, 0x00, 0x30, 0x30},
+    /* 0x2F / */
+    {0x06, 0x0C, 0x18, 0x30, 0x60},
+    /* 0x30 0 */
+    {0x38, 0x6C, 0x36, 0x6C, 0x38},
+    /* 0x31 1 */
+    {0x18, 0x38, 0x18, 0x18, 0x3C},
+    /* 0x32 2 */
+    {0x78, 0x60, 0x30, 0x18, 0x7C},
+    /* 0x33 3 */
+    {0x78, 0x60, 0x38, 0x00, 0x78},
+    /* 0x34 4 */
+    {0x0C, 0x1C, 0x3C, 0x7E, 0x0C},
+    /* 0x35 5 */
+    {0x7C, 0x60, 0x78, 0x06, 0x7C},
+    /* 0x36 6 */
+    {0x38, 0x60, 0x7C, 0x66, 0x3C},
+    /* 0x37 7 */
+    {0x7C, 0x60, 0x30, 0x30, 0x30},
+    /* 0x38 8 */
+    {0x3C, 0x66, 0x3C, 0x66, 0x3C},
+    /* 0x39 9 */
+    {0x3C, 0x66, 0x3E, 0x60, 0x3C},
+    /* 0x3A : */
+    {0x00, 0x30, 0x00, 0x30, 0x00},
+    /* 0x3B ; */
+    {0x00, 0x30, 0x00, 0x30, 0x30},
+    /* 0x3C < */
+    {0x0C, 0x18, 0x30, 0x18, 0x0C},
+    /* 0x3D = */
+    {0x00, 0x7E, 0x00, 0x7E, 0x00},
+    /* 0x3E > */
+    {0x30, 0x18, 0x0C, 0x18, 0x30},
+    /* 0x3F ? */
+    {0x78, 0x60, 0x30, 0x00, 0x30},
+    /* 0x40 @ */
+    {0x3C, 0x66, 0x7E, 0x06, 0x3C},
+    /* 0x41 A */
+    {0x18, 0x3C, 0x7E, 0x66, 0x66},
+    /* 0x42 B */
+    {0x7C, 0x66, 0x7C, 0x66, 0x7C},
+    /* 0x43 C */
+    {0x3C, 0x66, 0x60, 0x60, 0x3C},
+    /* 0x44 D */
+    {0x78, 0x6C, 0x66, 0x66, 0x78},
+    /* 0x45 E */
+    {0x7E, 0x60, 0x7C, 0x60, 0x7E},
+    /* 0x46 F */
+    {0x7E, 0x60, 0x7C, 0x60, 0x60},
+    /* 0x47 G */
+    {0x3C, 0x66, 0x6C, 0x66, 0x3C},
+    /* 0x48 H */
+    {0x66, 0x66, 0x7E, 0x66, 0x66},
+    /* 0x49 I */
+    {0x3C, 0x18, 0x18, 0x18, 0x3C},
+    /* 0x4A J */
+    {0x7C, 0x06, 0x06, 0x06, 0x3C},
+    /* 0x4B K */
+    {0x66, 0x6C, 0x78, 0x6C, 0x66},
+    /* 0x4C L */
+    {0x60, 0x60, 0x60, 0x60, 0x7E},
+    /* 0x4D M */
+    {0x63, 0x77, 0x7F, 0x6B, 0x63},
+    /* 0x4E N */
+    {0x66, 0x76, 0x7E, 0x6E, 0x66},
+    /* 0x4F O */
+    {0x3C, 0x66, 0x66, 0x66, 0x3C},
+    /* 0x50 P */
+    {0x7C, 0x66, 0x7C, 0x60, 0x60},
+    /* 0x51 Q */
+    {0x3C, 0x66, 0x76, 0x6C, 0x38},
+    /* 0x52 R */
+    {0x7C, 0x66, 0x7C, 0x6C, 0x66},
+    /* 0x53 S */
+    {0x3C, 0x66, 0x3C, 0x06, 0x7C},
+    /* 0x54 T */
+    {0x7E, 0x7E, 0x18, 0x18, 0x18},
+    /* 0x55 U */
+    {0x66, 0x66, 0x66, 0x66, 0x3C},
+    /* 0x56 V */
+    {0x66, 0x66, 0x66, 0x3C, 0x18},
+    /* 0x57 W */
+    {0x63, 0x63, 0x77, 0x7F, 0x36},
+    /* 0x58 X */
+    {0x66, 0x3C, 0x18, 0x3C, 0x66},
+    /* 0x59 Y */
+    {0x66, 0x66, 0x3C, 0x18, 0x18},
+    /* 0x5A Z */
+    {0x7C, 0x66, 0x3C, 0x18, 0x7C},
+    /* 0x5B [ */
+    {0x3C, 0x30, 0x30, 0x30, 0x3C},
+    /* 0x5C backslash */
+    {0x60, 0x30, 0x18, 0x0C, 0x06},
+    /* 0x5D ] */
+    {0x3C, 0x0C, 0x0C, 0x0C, 0x3C},
+    /* 0x5E ^ */
+    {0x18, 0x3C, 0x66, 0x00, 0x00},
+    /* 0x5F _ */
+    {0x00, 0x00, 0x00, 0x00, 0x7E},
+    /* 0x60 ` */
+    {0x30, 0x18, 0x00, 0x00, 0x00},
+    /* 0x61 a */
+    {0x00, 0x00, 0x3C, 0x66, 0x3C},
+    /* 0x62 b */
+    {0x60, 0x60, 0x7C, 0x66, 0x7C},
+    /* 0x63 c */
+    {0x00, 0x00, 0x3C, 0x66, 0x66},
+    /* 0x64 d */
+    {0x06, 0x06, 0x7E, 0x66, 0x7E},
+    /* 0x65 e */
+    {0x00, 0x00, 0x3C, 0x6E, 0x3C},
+    /* 0x66 f */
+    {0x30, 0x7C, 0x06, 0x06, 0x3C},
+    /* 0x67 g */
+    {0x00, 0x3E, 0x66, 0x66, 0x3C},
+    /* 0x68 h */
+    {0x60, 0x60, 0x7C, 0x66, 0x66},
+    /* 0x69 i */
+    {0x00, 0x18, 0x18, 0x00, 0x3C},
+    /* 0x6A j */
+    {0x06, 0x06, 0x06, 0x06, 0x3C},
+    /* 0x6B k */
+    {0x60, 0x6C, 0x78, 0x6C, 0x66},
+    /* 0x6C l */
+    {0x3C, 0x18, 0x18, 0x18, 0x3C},
+    /* 0x6D m */
+    {0x00, 0x00, 0x7E, 0x6E, 0x76},
+    /* 0x6E n */
+    {0x00, 0x00, 0x7C, 0x66, 0x66},
+    /* 0x6F o */
+    {0x00, 0x00, 0x3C, 0x66, 0x3C},
+    /* 0x70 p */
+    {0x00, 0x00, 0x7C, 0x66, 0x7C},
+    /* 0x71 q */
+    {0x00, 0x00, 0x7E, 0x66, 0x3E},
+    /* 0x72 r */
+    {0x00, 0x00, 0x7C, 0x60, 0x60},
+    /* 0x73 s */
+    {0x00, 0x00, 0x3C, 0x60, 0x3C},
+    /* 0x74 t */
+    {0x0C, 0x7E, 0x0C, 0x0C, 0x38},
+    /* 0x75 u */
+    {0x00, 0x00, 0x66, 0x66, 0x3C},
+    /* 0x76 v */
+    {0x00, 0x00, 0x66, 0x3C, 0x18},
+    /* 0x77 w */
+    {0x00, 0x00, 0x67, 0x67, 0x3E},
+    /* 0x78 x */
+    {0x00, 0x00, 0x66, 0x3C, 0x66},
+    /* 0x79 y */
+    {0x00, 0x00, 0x66, 0x66, 0x3C},
+    /* 0x7A z */
+    {0x00, 0x00, 0x7C, 0x7C, 0x78},
+    /* 0x7B { */
+    {0x0C, 0x18, 0x30, 0x18, 0x0C},
+    /* 0x7C | */
+    {0x30, 0x30, 0x30, 0x30, 0x30},
+    /* 0x7D } */
+    {0x30, 0x18, 0x0C, 0x18, 0x30},
+    /* 0x7E ~ */
+    {0x00, 0x00, 0x00, 0x00, 0x00},
+};
+
+#define FONT_W 5
+#define FONT_H 7
+#define FONT_STEP 9
+
+/* 颜色常量 */
+#define CURSOR_COLOR 0xFF0055FFu   /* 蓝色光标 */
+#define BG_COLOR 0xFF1E1E1Eu       /* 深色背景 */
+#define TEXT_COLOR 0xFFD4D4D4u     /* 浅色文字 */
+#define DIM_COLOR 0xFF808080u      /* 灰色行号 */
+#define STATUS_BG 0xFF007ACCu      /* 蓝色状态栏 */
+
+/* 绘制单个字符（使用位图字体） */
+static void draw_char_bitmap(char ch, int x, int y, u32 color) {
+    if (ch < ' ' || ch > '~') return;
+    int idx = ch - ' ';
+    if (idx < 0 || idx >= 95) return;
+    
+    for (int row = 0; row < FONT_H; row++) {
+        unsigned char bits = font_5x7[idx][row];
+        for (int col = 0; col < FONT_W; col++) {
+            if (bits & (1 << (FONT_W - 1 - col))) {
+                da_fill_rect(&g_ac, x + col, y + row, 1, 1, color);
+            }
+        }
+    }
+}
+
+/* 绘制文本行 */
+static void draw_text_line(const char *text, int x, int y, u32 color) {
+    int cx = x;
+    while (*text) {
+        draw_char_bitmap(*text, cx, y, color);
+        cx += FONT_STEP;
+        text++;
+    }
+}
+
+/* 重绘所有 */
+static void redraw_all(void) {
+    da_fill_bg(&g_ac, BG_COLOR);
+    
+    int margin_x = 10;
+    int top_y = 44;
+    
+    /* 计算可见列数 */
+    int visible_cols = (g_ac.width - 20) / FONT_STEP;
+    if (visible_cols < 10) visible_cols = 10;
+    
+    /* 绘制可见行 */
+    for (int line = g_scroll_top; line < g_line_count && line < g_scroll_top + g_visible_rows; line++) {
+        int screen_y = top_y + (line - g_scroll_top) * FONT_STEP;
+        
+        /* 行号 */
+        char ln[8];
+        int p = snprintf(ln, sizeof(ln), "%d ", line + 1);
+        
+        /* 行号区域背景 */
+        int line_num_width = p * FONT_STEP;
+        da_fill_rect(&g_ac, 0, screen_y - 2, line_num_width + 10, FONT_STEP, 0xFF252526u);
+        
+        /* 绘制行号 */
+        draw_text_line(ln, 5, screen_y, DIM_COLOR);
+        
+        /* 文本内容 */
+        const char *line_text = g_lines[line];
+        int line_len = (int)strlen(line_text);
+        int draw_len = line_len;
+        if (draw_len > visible_cols) draw_len = visible_cols;
+        
+        int text_start_x = margin_x + line_num_width;
+        for (int col = 0; col < draw_len; col++) {
+            draw_char_bitmap(line_text[col], text_start_x + col * FONT_STEP, screen_y, TEXT_COLOR);
+        }
+    }
+    
+    /* 光标 */
+    if (g_current_line >= g_scroll_top && g_current_line < g_scroll_top + g_visible_rows) {
+        int screen_y = top_y + (g_current_line - g_scroll_top) * FONT_STEP;
+        
+        /* 计算行号宽度 */
+        char tmp_ln[8];
+        snprintf(tmp_ln, sizeof(tmp_ln), "%d ", g_current_line + 1);
+        int line_num_width = (int)strlen(tmp_ln) * FONT_STEP;
+        int text_start_x = margin_x + line_num_width;
+        
+        /* 高亮当前光标位置 */
+        int cursor_x = text_start_x + g_current_col * FONT_STEP;
+        da_fill_rect(&g_ac, cursor_x, screen_y, FONT_W, FONT_H, CURSOR_COLOR);
+    }
+    
+    /* 状态栏 */
+    char status[128];
+    snprintf(status, sizeof(status), "Line: %d  Col: %d  Lines: %d  ESC=Exit",
+             g_current_line + 1, g_current_col + 1, g_line_count);
+    
+    da_fill_rect(&g_ac, 0, g_ac.height - 24, g_ac.width, 24, STATUS_BG);
+    draw_text_line(status, 10, g_ac.height - 22, 0xFFFFFFFFu);
+    
+    /* 标题栏 */
+    da_fill_rect(&g_ac, 0, 0, g_ac.width, 36, 0xFF2D2D2Du);
+    draw_text_line("Notes Preview (Deshab-OS)", 10, 6, 0xFFFFFFFFu);
+    da_fill_rect(&g_ac, 0, 36, g_ac.width, 2, 0xFF007ACCu);
+}
+
+static void scroll_cursor_into_view(void) {
+    if (g_current_line < g_scroll_top) {
+        g_scroll_top = g_current_line;
+    }
+    if (g_current_line >= g_scroll_top + g_visible_rows) {
+        g_scroll_top = g_current_line - g_visible_rows + 1;
+    }
+}
+
+/* 换行 */
+static void handle_enter(void) {
+    if (g_current_line >= 511) return;
+    
+    int cur_len = (int)strlen(g_lines[g_current_line]);
+    if (g_current_col < cur_len) {
+        int remaining = cur_len - g_current_col;
+        memmove(g_lines[g_current_line] + g_current_col + remaining, 
+                g_lines[g_current_line] + g_current_col, remaining + 1);
+        g_lines[g_current_line][g_current_col + remaining] = '\0';
+    } else {
+        g_lines[g_current_line][g_current_col] = '\0';
+    }
+    
+    /* 移动下一行 */
+    memmove(g_lines[g_current_line + 1], g_lines[g_current_line + 1], 256);
+    g_line_count++;
+    g_current_line++;
+    g_current_col = 0;
+    
+    scroll_cursor_into_view();
+}
+
+/* Backspace删除 */
+static void handle_backspace(void) {
+    if (g_current_col > 0) {
+        int len = (int)strlen(g_lines[g_current_line]);
+        memmove(g_lines[g_current_line] + g_current_col - 1, 
+                g_lines[g_current_line] + g_current_col, len - g_current_col + 1);
+        g_current_col--;
+    } else if (g_current_line > 0) {
+        int prev_len = (int)strlen(g_lines[g_current_line - 1]);
+        int cur_len = (int)strlen(g_lines[g_current_line]);
+        if (prev_len + cur_len < 255) {
+            memcpy(g_lines[g_current_line - 1] + prev_len, g_lines[g_current_line], cur_len + 1);
+            for (int i = g_current_line; i < g_line_count - 1; i++) {
+                memcpy(g_lines[i], g_lines[i+1], 256);
+            }
+            g_line_count--;
+            g_current_line--;
+            g_current_col = prev_len;
+        }
+    }
+}
+
+/* 插入字符 */
+static void insert_char(char c) {
+    if (c < 32 || c > 126) return;
+    
+    int len = (int)strlen(g_lines[g_current_line]);
+    if (len >= 255) return;
+    
+    memmove(g_lines[g_current_line] + g_current_col + 1, 
+            g_lines[g_current_line] + g_current_col, len - g_current_col + 1);
+    g_lines[g_current_line][g_current_col] = c;
+    g_current_col++;
+}
+
+int main(int argc, char *argv[]) {
+    (void)argc; (void)argv;
+    
+    const char *title = "Notes Preview (Deshab-OS) - ESC to exit";
+    int width = 1024;
+    int height = 768;
+    
+    if (da_init_linux(&g_ac, title, width, height) != 0) {
+        return 1;
+    }
+    
+    g_visible_rows = (height - 60 - 24) / FONT_STEP;
+    if (g_visible_rows < 5) g_visible_rows = 5;
+    
+    /* 初始化空文档 */
+    g_line_count = 1;
+    g_lines[0][0] = '\0';
+    
+    redraw_all();
+    da_flush(&g_ac);
+    
+    /* 主事件循环 */
+    SDL_Event event;
+    while (g_running) {
+        while (SDL_PollEvent(&event)) {
+            if (event.type == SDL_QUIT) {
+                g_running = 0;
+                break;
+            }
+            
+            /* 处理文本输入事件（支持输入法） */
+            if (event.type == SDL_TEXTINPUT) {
+                for (int i = 0; event.text.text[i]; i++) {
+                    unsigned char c = (unsigned char)event.text.text[i];
+                    if (c >= 32 && c <= 126) {
+                        insert_char((char)c);
+                    }
+                }
+                scroll_cursor_into_view();
+                redraw_all();
+                da_flush(&g_ac);
+            }
+            
+            if (event.type == SDL_KEYDOWN) {
+                u8 sc = da_sdl_to_ps2_scan(event.key.keysym.sym);
+                
+                if (sc == 0x01) { /* Esc */
+                    g_running = 0;
+                } else if (sc == 0x1C) { /* Enter */
+                    handle_enter();
+                    redraw_all();
+                    da_flush(&g_ac);
+                } else if (sc == 0x0E) { /* Backspace */
+                    handle_backspace();
+                    redraw_all();
+                    da_flush(&g_ac);
+                } else if (sc == 0x4B) { /* Left */
+                    if (g_current_col > 0) g_current_col--;
+                    else if (g_current_line > 0) {
+                        g_current_line--;
+                        g_current_col = (int)strlen(g_lines[g_current_line]);
+                    }
+                    redraw_all();
+                    da_flush(&g_ac);
+                } else if (sc == 0x4D) { /* Right */
+                    if (g_current_col < (int)strlen(g_lines[g_current_line])) g_current_col++;
+                    else if (g_current_line < g_line_count - 1) {
+                        g_current_line++;
+                        g_current_col = 0;
+                    }
+                    redraw_all();
+                    da_flush(&g_ac);
+                } else if (sc == 0x48) { /* Up */
+                    if (g_current_line > 0) g_current_line--;
+                    if (g_current_col > (int)strlen(g_lines[g_current_line])) {
+                        g_current_col = (int)strlen(g_lines[g_current_line]);
+                    }
+                    redraw_all();
+                    da_flush(&g_ac);
+                } else if (sc == 0x50) { /* Down */
+                    if (g_current_line < g_line_count - 1) g_current_line++;
+                    if (g_current_col > (int)strlen(g_lines[g_current_line])) {
+                        g_current_col = (int)strlen(g_lines[g_current_line]);
+                    }
+                    redraw_all();
+                    da_flush(&g_ac);
+                }
+            }
+        }
+        SDL_Delay(16);
+    }
+    
+    da_cleanup(&g_ac);
+    return 0;
+}