From 3a3602861226e995d95a8898668cd559c3ca1cf6 Mon Sep 17 00:00:00 2001
From: Benji Dial <benji6283@gmail.com>
Date: Wed, 17 Feb 2021 16:35:02 -0500
Subject: quick bitmap font format, borrowing new default font from X

---
 src/user/libfont/bdf.c   | 15 ++-------------
 src/user/libfont/bdf.h   |  5 ++++-
 src/user/libfont/fonts.c | 21 +++++++++++----------
 src/user/libfont/pbf.c   | 43 +++++++++++++++++++++++++++++++++++++++++++
 src/user/libfont/pbf.h   | 11 +++++++++++
 5 files changed, 71 insertions(+), 24 deletions(-)
 create mode 100644 src/user/libfont/pbf.c
 create mode 100644 src/user/libfont/pbf.h

(limited to 'src/user/libfont')

diff --git a/src/user/libfont/bdf.c b/src/user/libfont/bdf.c
index 2c19a15..de5489d 100644
--- a/src/user/libfont/bdf.c
+++ b/src/user/libfont/bdf.c
@@ -17,16 +17,10 @@ static inline uint8_t hex_to_n(char ch) {
 }
 
 //very minimal implementation
-bool try_load_bdf(const char *path, struct font_info *into) {
-  struct file *f = open_file(path);
-  if (!f)
-    PANIC("Can't open font file sent by get_font.");
-
+bool try_load_bdf(struct file *f, struct font_info *into) {
   read_line_from_file(f, line_buf, LINE_BUF_SIZE - 1);
-  if (!strequ(line_buf, "STARTFONT 2.1")) {
-    close_file(f);
+  if (!strequ(line_buf, "STARTFONT 2.1"))
     return false;
-  }
 
   for (uint16_t i = 0; i < 256; ++i)
     into->bitmaps[i] = 0;
@@ -71,9 +65,6 @@ bool try_load_bdf(const char *path, struct font_info *into) {
     }
   }
 
-  close_file(f);
-  f = 0;
-
   if ((into->char_height  == -1) ||
       (into->char_width   == -1) ||
       (into->space_height == -1) ||
@@ -90,8 +81,6 @@ bool try_load_bdf(const char *path, struct font_info *into) {
   return true;
 
 bad_format:
-  if (f)
-    close_file(f);
   for (uint16_t i = 0; i < 256; ++i)
     if (into->bitmaps[i])
       free_block(into->bitmaps[i]);
diff --git a/src/user/libfont/bdf.h b/src/user/libfont/bdf.h
index 4ed4189..cbf3772 100644
--- a/src/user/libfont/bdf.h
+++ b/src/user/libfont/bdf.h
@@ -1,8 +1,11 @@
 #ifndef LIBFONT_BDF_H
 #define LIBFONT_BDF_H
 
+#include <libfont/fonts.h>
+#include <knob/file.h>
+
 #include <stdbool.h>
 
-bool try_load_bdf(const char *path, struct font_info *into);
+bool try_load_bdf(struct file *f, struct font_info *into);
 
 #endif
\ No newline at end of file
diff --git a/src/user/libfont/fonts.c b/src/user/libfont/fonts.c
index 1692992..c085604 100644
--- a/src/user/libfont/fonts.c
+++ b/src/user/libfont/fonts.c
@@ -6,14 +6,18 @@
 
 #include "filist.h"
 #include "bdf.h"
+#include "pbf.h"
 
 #define FONT_PATH "fonts/"
 #define FONT_PATH_L 6
 
 struct font_loader_t {
   const char *ext;
-  bool (*func)(const char *, struct font_info *);
+  bool (*func)(struct file *f, struct font_info *);
 } font_loaders[] = {
+  { .ext = ".pbf",
+    .func = try_load_pbf
+  },
   { .ext = ".bdf",
     .func = try_load_bdf
   },
@@ -36,20 +40,17 @@ struct font_info *get_font(const char *name) {
     blockcpy(buf + FONT_PATH_L, name, name_len);
     strcpy(buf + FONT_PATH_L + name_len, i->ext);
     struct file *f = open_file(buf);
-    if (!f) {
-      free_block(buf);
+    free_block(buf);
+    if (!f)
       continue;
-    }
-    syslogf("[libfont] Loading %s%s...", name, i->ext);
-    if (i->func(buf, font)) {
+  //syslogf("[libfont] Loading %s%s...", name, i->ext);
+    if (i->func(f, font)) {
       close_file(f);
-      free_block(buf);
-      syslogf("[libfont] Loaded %s%s.", name, i->ext);
+    //syslogf("[libfont] Loaded %s%s.", name, i->ext);
       return font;
     }
     close_file(f);
-    free_block(buf);
-    syslogf("[libfont] Failed to load %s%s.", name, i->ext);
+  //syslogf("[libfont] Failed to load %s%s.", name, i->ext);
   }
   del_last();
   return 0;
diff --git a/src/user/libfont/pbf.c b/src/user/libfont/pbf.c
new file mode 100644
index 0000000..34d5be5
--- /dev/null
+++ b/src/user/libfont/pbf.c
@@ -0,0 +1,43 @@
+#include <libfont/fonts.h>
+
+#include <knob/panic.h>
+#include <knob/file.h>
+#include <knob/heap.h>
+
+#include <stdbool.h>
+
+bool try_load_pbf(struct file *f, struct font_info *into) {
+  uint8_t head[4];
+  if (read_from_file(f, 4, head) != 4)
+    return false;
+
+  into->space_width  = head[0] + head[2];
+  into->space_height = head[1] + head[3];
+  into->char_width   = head[0];
+  into->char_height  = head[1];
+
+  const uint16_t bm_size  =  head[0] * head[1];
+  const uint16_t bm_bytes = (bm_size - 1) / 8 + 1;
+
+  uint32_t bm_offsets[256];
+  if (read_from_file(f, 4 * 256, bm_offsets) != 4 * 256)
+    return false;
+
+  uint8_t bm_buf[256 * 256 / 8];
+
+  for (uint16_t i = 0; i < 256; ++i)
+    if (bm_offsets[i] == 0xffffffff)
+      into->bitmaps[i] = 0;
+    else {
+      bool *bp = get_block(bm_size);
+      if (!bp)
+        PANIC("couldn't allocate memory in pbf loader (todo: fail gracefully)");
+      seek_file_to(f, 4 + 4 * 256 + bm_offsets[i]);
+      read_from_file(f, bm_bytes, bm_buf);
+      for (uint16_t j = 0; j < bm_size; ++j)
+        bp[j] = (bm_buf[j / 8] >> (j % 8)) & 1;
+      into->bitmaps[i] = bp;
+    }
+
+  return true;
+}
\ No newline at end of file
diff --git a/src/user/libfont/pbf.h b/src/user/libfont/pbf.h
new file mode 100644
index 0000000..bcf5d18
--- /dev/null
+++ b/src/user/libfont/pbf.h
@@ -0,0 +1,11 @@
+#ifndef LIBFONT_PBF_H
+#define LIBFONT_PBF_H
+
+#include <libfont/fonts.h>
+#include <knob/file.h>
+
+#include <stdbool.h>
+
+bool try_load_pbf(struct file *f, struct font_info *into);
+
+#endif
\ No newline at end of file
-- 
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