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ohhhhhhhhhhh (exclude linux-extra-rootfs.img build artifact)

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Linehu
2026-10-01 23:13:42 +08:00
parent 737a2cb0db
commit 1074962546
533 changed files with 133239 additions and 5460 deletions
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CODE/desktop/zhfont.c
+206
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@@ -0,0 +1,206 @@
/* zhfont.c — 中文位图字库加载与渲染实现
*
* .dbf 格式（见 ../font/dbf.h）：
* header 14 字节 + count*12 字节索引（按 Unicode 码点升序）+ 字形数据。
* 索引项 data_offset 相对文件头。
*
* 渲染：8bpp 灰度字形逐像素 du_blend（与 ASCII 渲染同路径，无字体缓存，
* 每屏 <500 字在性能预算内，见桌面重构计划第七节）。
*/
/* 顺序敏感：ascii_font.h 声明 g_ascii（deshab_ui.h 的 du_draw_char 引用） */
#include "ascii_font.h"
#include "zhfont.h"
#include "../font/dbf.h"
typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned int u32;
typedef unsigned long long u64;
typedef long long i64;
/* ---- 字库状态 ---- */
static zhfont_read_fn g_zh_read = 0;
static const u8 *g_zh16 = 0;
static const u8 *g_zh24 = 0;
/* ---- dbf 访问 ---- */
static const u8 *zh_dbf_get(const u8 *font, u32 cp, int *out_w, int *out_h) {
const dbf_header *hdr = (const dbf_header *)font;
const dbf_index_entry *idx = (const dbf_index_entry *)(font + 14);
if (cp > 0xFFFF) return 0;
int i = dbf_lookup((dbf_index_entry *)idx, hdr->count, (u16)cp);
if (i < 0) return 0;
*out_w = idx[i].width;
*out_h = hdr->height;
return font + idx[i].offset;
}
/* 缺字占位：1px 空框 */
static int zh_draw_missing(du_context *ctx, i64 x, i64 y, int w, int h, u32 fg) {
du_rect_outline(ctx, x, y, w, h, fg, 1);
return w;
}
/* ---- 公开接口 ---- */
/* 头部静态校验（magic / bpp / 尺寸字段），不依赖文件大小 */
static int zh_dbf_valid(const u8 *dst) {
const dbf_header *hdr = (const dbf_header *)dst;
if (!dst) return -1;
if (hdr->magic[0] != 'D' || hdr->magic[1] != 'B' ||
hdr->magic[2] != 'F' || hdr->magic[3] != 0x10) return -2;
if (hdr->bpp != 8) return -3;
if (hdr->count == 0 || hdr->height == 0 || hdr->width == 0) return -4;
return 0;
}
static int zh_load_dbf(const char *path, u8 *dst, u32 cap) {
u32 sz = 0;
if (!g_zh_read) return -1;
if (g_zh_read(path, dst, cap, &sz) != 0) return -2;
if (sz < 14) return -3;
int rc = zh_dbf_valid(dst);
if (rc != 0) return rc - 10;
/* 越界防护：索引区与最大数据项必须在文件内 */
{
const dbf_header *hdr = (const dbf_header *)dst;
const dbf_index_entry *last =
(const dbf_index_entry *)(dst + 14 + (u64)(hdr->count - 1) * 12);
if (14 + (u64)hdr->count * 12 > sz) return -7;
if ((u64)last->offset + last->size > sz) return -8;
}
return 0;
}
int zhfont_init(zhfont_read_fn read_to) {
int rc;
g_zh_read = read_to;
rc = zh_load_dbf("system/font/simhei_16.dbf",
(u8 *)ZHFONT16_ADDR, ZHFONT16_MAX);
if (rc != 0) {
g_zh16 = 0;
return rc; /* -1=无读取器 -2=FAT32读失败 -3=过小 -7/-8=越界 -11..-13=头校验 */
}
g_zh16 = (const u8 *)ZHFONT16_ADDR;
return 0;
}
int zhfont_load24(void) {
if (g_zh24) return 0;
if (zh_load_dbf("system/font/simhei_24.dbf",
(u8 *)ZHFONT24_ADDR, ZHFONT24_MAX) != 0) {
return -1;
}
g_zh24 = (const u8 *)ZHFONT24_ADDR;
return 0;
}
int zhfont_ok(void) { return g_zh16 != 0; }
int zhfont_ok24(void) { return g_zh24 != 0; }
void zhfont_attach16(const void *dbf_data) {
/* 校验 magic 后挂接（数据由调用方保证生命周期） */
if (dbf_data && zh_dbf_valid((const u8 *)dbf_data) == 0) g_zh16 = (const u8 *)dbf_data;
else g_zh16 = 0;
}
void zhfont_attach24(const void *dbf_data) {
if (dbf_data && zh_dbf_valid((const u8 *)dbf_data) == 0) g_zh24 = (const u8 *)dbf_data;
else g_zh24 = 0;
}
unsigned int zh_utf8_decode(const char **s) {
const u8 *p = (const u8 *)*s;
u8 c = *p++;
unsigned int cp;
int extra;
if (c < 0x80) { *s = (const char *)p; return c; }
else if ((c & 0xE0) == 0xC0) { cp = c & 0x1F; extra = 1; }
else if ((c & 0xF0) == 0xE0) { cp = c & 0x0F; extra = 2; }
else if ((c & 0xF8) == 0xF0) { cp = c & 0x07; extra = 3; }
else { (*s)++; return 0xFFFFFFFFu; } /* 无效首字节 */
for (int i = 0; i < extra; i++) {
u8 cc = *p;
if ((cc & 0xC0) != 0x80) { (*s)++; return 0xFFFFFFFFu; }
cp = (cp << 6) | (cc & 0x3F);
p++;
}
*s = (const char *)p;
return cp;
}
int zh_draw_char(du_context *ctx, unsigned int codepoint,
i64 x, i64 y, unsigned int fg) {
if (!g_zh16) {
/* 字库未加载：ASCII 走 Consolas，其余画空框 */
if (codepoint >= 0x20 && codepoint < 0x7F) {
du_draw_char(ctx, (char)codepoint, x, y, fg, 0);
return (int)DU_ASCII_STEP;
}
return 16;
}
if (codepoint < 0x20) return 4; /* 控制字符：窄空隙 */
int w, h;
const u8 *g = zh_dbf_get(g_zh16, codepoint, &w, &h);
if (!g) return zh_draw_missing(ctx, x, y, 16, 16, fg);
for (int r = 0; r < h; r++) {
for (int c = 0; c < w; c++) {
u8 a = g[r * w + c];
if (!a) continue;
du_u32 bg = du_pixel_read(ctx, x + c, y + r);
du_pixel(ctx, x + c, y + r,
(a == 255) ? fg : du_blend(bg, fg, a));
}
}
return w;
}
int zh_string_width(const char *utf8, int size24) {
int total = 0;
const u8 *font = size24 ? g_zh24 : g_zh16;
if (!utf8) return 0;
while (*utf8) {
unsigned int cp = zh_utf8_decode(&utf8);
if (cp == 0xFFFFFFFFu) { total += 4; continue; }
if (cp < 0x20) { total += 4; continue; }
int w, h;
const u8 *g = font ? zh_dbf_get(font, cp, &w, &h) : 0;
if (!g) w = size24 ? 24 : 16;
total += w + 1; /* 1px 字间距 */
}
return total > 0 ? total - 1 : 0;
}
int zh_line_height(int size24) { return size24 ? 26 : 18; }
int zh_draw_string(du_context *ctx, const char *utf8,
i64 x, i64 y, unsigned int fg, int size24) {
const u8 *font = size24 ? g_zh24 : g_zh16;
i64 cx = x;
if (!utf8) return 0;
while (*utf8) {
unsigned int cp = zh_utf8_decode(&utf8);
if (cp == 0xFFFFFFFFu) { cx += 4; continue; }
if (cp < 0x20) { cx += 4; continue; }
if (cp == 0x20) { cx += (size24 ? 18 : 12); continue; }
int w, h;
const u8 *g = font ? zh_dbf_get(font, cp, &w, &h) : 0;
if (!g) {
cx += zh_draw_missing(ctx, cx, y, size24 ? 24 : 16,
size24 ? 24 : 16, fg) + 1;
continue;
}
for (int r = 0; r < h; r++) {
for (int c = 0; c < w; c++) {
u8 a = g[r * w + c];
if (!a) continue;
du_u32 bg = du_pixel_read(ctx, cx + c, y + r);
du_pixel(ctx, cx + c, y + r,
(a == 255) ? fg : du_blend(bg, fg, a));
}
}
cx += w + 1;
}
return (int)(cx - x);
}