Allow fonts to use smaller buffers than the default size. use font_load_ex() to speficiy the buffer size. If the font is already loaded with a smaller buffer it will be reloaded to use the new size. Also fix an issue where handles would get lost if fonts fail to load in skins

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30592 a1c6a512-1295-4272-9138-f99709370657

apps/gui/skin_engine/skin_parser.c

@@ -419,7 +419,7 @@ static int parse_font_load(struct skin_element *element,
     if(element->params_count > 2)
         glyphs = element->params[2].data.number;
     else
-        glyphs = GLYPHS_TO_CACHE;
+        glyphs = 0;
     if (id < 2)
     {
         DEBUGF("font id must be >= 2\n");
@@ -1675,8 +1675,13 @@ static bool skin_load_fonts(struct wps_data *data)
         {
             char path[MAX_PATH];
             snprintf(path, sizeof path, FONT_DIR "/%s", font->name);
-            font->id = font_load(path/*,
+            if (skinfonts[font_id-2].glyphs > 0)
-                       skinfonts[font_id-FONT_FIRSTUSERFONT].glyphs*/);
+            {
+                font->id = font_load_ex(path,
+                        font_glyphs_to_bufsize(path, skinfonts[font_id-2].glyphs));
+            }
+            else
+                font->id = font_load(path);
             //printf("[%d] %s -> %d\n",font_id, font->name, font->id);
             id_array[font_count++] = font->id;
         }
@@ -1693,18 +1698,16 @@ static bool skin_load_fonts(struct wps_data *data)
         /* finally, assign the font_id to the viewport */
         vp->font = font->id;
     }
-    if (success)
-    {
     data->font_ids = skin_buffer_alloc(font_count * sizeof(int));
-        if (data->font_ids == NULL)
+    if (!success || data->font_ids == NULL)
     {
         while (font_count > 0)
             font_unload(id_array[--font_count]);
+        data->font_ids = NULL;
         return false;
     }
     memcpy(data->font_ids, id_array, sizeof(int)*font_count);
     data->font_count = font_count;
-    }
     return success;
 }
 

firmware/export/font.h

@@ -21,6 +21,7 @@
 #ifndef _FONT_H
 #define _FONT_H
 
+#include <stdlib.h>
 #include "inttypes.h"
 #include "stdbool.h"
 
@@ -102,7 +103,7 @@ struct font {
     unsigned char *buffer_start;    /* buffer to store the font in */       
     unsigned char *buffer_position; /* position in the buffer */    
     unsigned char *buffer_end;      /* end of the buffer */
-    int            buffer_size;     /* size of the buffer in bytes */
+    size_t         buffer_size;     /* size of the buffer in bytes */
 #ifndef __PCTOOL__    
     struct font_cache cache;
     uint32_t file_width_offset;    /* offset to file width data    */
@@ -116,6 +117,7 @@ struct font {
 void font_init(void) INIT_ATTR;
 const char* font_filename(int font_id);
 int font_load(const char *path);
+int font_load_ex(const char *path, size_t buffer_size);
 int font_glyphs_to_bufsize(const char *path, int glyphs);
 void font_unload(int font_id);
 

firmware/font.c

@@ -79,7 +79,7 @@ struct buflib_alloc_data {
     struct font font;
     bool handle_locked; /* is the buflib handle currently locked? */
     int refcount;       /* how many times has this font been loaded? */
-    unsigned char buffer[MAX_FONT_SIZE];
+    unsigned char buffer[];
 };
 static int buflib_allocations[MAXFONTS];
 static int handle_for_glyphcache;
@@ -349,7 +349,7 @@ static void font_reset(int font_id)
 static bool internal_load_font(int font_id, const char *path,
                                char *buf, size_t buf_size)
 {
-    int size;
+    size_t size;
     struct font* pf = pf_from_handle(buflib_allocations[font_id]);
     /* save loaded glyphs */
     glyph_cache_save(pf);
@@ -433,15 +433,16 @@ static int find_font_index(const char* path)
     return FONT_SYSFIXED;
 }
 
-static int alloc_and_init(int font_idx, const char* name)
+static int alloc_and_init(int font_idx, const char* name, size_t size)
 {
     int *phandle = &buflib_allocations[font_idx];
     int handle = *phandle;
     struct buflib_alloc_data *pdata;
     struct font *pf;
+    size_t alloc_size = size + sizeof(struct buflib_alloc_data);
     if (handle > 0)
         return handle;
-    *phandle = core_alloc_ex(name, sizeof(struct buflib_alloc_data), &buflibops);
+    *phandle = core_alloc_ex(name, alloc_size, &buflibops);
     handle = *phandle;
     if (handle < 0)
         return handle;
@@ -451,7 +452,7 @@ static int alloc_and_init(int font_idx, const char* name)
     pdata->handle_locked = false;
     pdata->refcount = 1;
     pf->buffer_position = pf->buffer_start = buffer_from_handle(handle);
-    pf->buffer_size = MAX_FONT_SIZE;
+    pf->buffer_size = size;
     return handle;
 }
 
@@ -465,17 +466,44 @@ const char* font_filename(int font_id)
     
 /* read and load font into incore font structure,
  * returns the font number on success, -1 on failure */
-int font_load(const char *path)
+int font_load_ex(const char *path, size_t buffer_size)
 {
     int font_id = find_font_index(path);
     char *buffer;
-    size_t buffer_size;
     int *handle;
 
     if (font_id > FONT_SYSFIXED)
     {
         /* already loaded, no need to reload */
         struct buflib_alloc_data *pd = core_get_data(buflib_allocations[font_id]);
+        if (pd->font.buffer_size < buffer_size)
+        {
+            int old_refcount, old_id;
+            /* reload the font:
+             * 1) save of refcont and id
+             * 2) force unload (set refcount to 1 to make sure it get unloaded)
+             * 3) reload with the larger buffer
+             * 4) restore the id and refcount
+             */
+            old_id = font_id;
+            old_refcount = pd->refcount;
+            pd->refcount = 1;
+            font_unload(font_id);
+            font_id = font_load_ex(path, buffer_size);
+            if (font_id < 0)
+            {
+                // not much we can do here, maybe try reloading with the small buffer again
+                return -1;
+            }
+            if (old_id != font_id)
+            {
+                buflib_allocations[old_id] = buflib_allocations[font_id];
+                buflib_allocations[font_id] = -1;
+                font_id = old_id;
+            }
+            pd = core_get_data(buflib_allocations[font_id]);
+            pd->refcount = old_refcount;
+        }
         pd->refcount++;
         //printf("reusing handle %d for %s (count: %d)\n", font_id, path, pd->refcount); 
         return font_id;
@@ -490,7 +518,7 @@ int font_load(const char *path)
         }
     }
     handle = &buflib_allocations[font_id];
-    *handle = alloc_and_init(font_id, path);
+    *handle = alloc_and_init(font_id, path, buffer_size);
     if (*handle < 0)
         return -1;
 
@@ -498,7 +526,6 @@ int font_load(const char *path)
         handle_for_glyphcache = *handle;
 
     buffer = buffer_from_handle(*handle);
-    buffer_size = MAX_FONT_SIZE; //FIXME
     lock_font_handle(*handle, true);
 
     if (!internal_load_font(font_id, path, buffer, buffer_size))
@@ -513,6 +540,10 @@ int font_load(const char *path)
     //printf("%s -> [%d] -> %d\n", path, font_id, *handle);
     return font_id; /* success!*/
 }
+int font_load(const char *path)
+{
+    return font_load_ex(path, MAX_FONT_SIZE);
+}
 
 void font_unload(int font_id)
 {