938 lines
26 KiB
C
938 lines
26 KiB
C
/****************************************************************************
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* libs/libnx/nxfonts/nxfonts_cache.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/nx/nxfonts.h>
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#include "nxcontext.h"
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This describes a rendering function */
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typedef CODE int (*nxf_renderer_t)(FAR nxgl_mxpixel_t *dest, uint16_t height,
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uint16_t width, uint16_t stride,
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FAR const struct nx_fontbitmap_s *bm,
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nxgl_mxpixel_t color);
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/* This structure defines one font cache */
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struct nxfonts_fcache_s
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{
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FAR struct nxfonts_fcache_s *flink; /* Supports a singly linked list */
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NXHANDLE font; /* Font handle associated with fontid */
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sem_t fsem; /* Serializes access to the font cache */
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uint16_t fontid; /* ID of font in this cache */
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int16_t fclients; /* Number of connected clients */
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uint8_t maxglyphs; /* Maximum size of glyph[] array */
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uint8_t nglyphs; /* Current size of glyph[] array */
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uint8_t bpp; /* Bits per pixel */
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nxgl_mxpixel_t fgcolor; /* Foreground color */
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nxgl_mxpixel_t bgcolor; /* Background color */
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nxf_renderer_t renderer; /* Font renderer */
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/* Glyph cache data storage */
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FAR struct nxfonts_glyph_s *head; /* Head of the list of glyphs */
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FAR struct nxfonts_glyph_s *tail; /* Tail of the list of glyphs */
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};
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* Head of a list of font caches */
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static FAR struct nxfonts_fcache_s *g_fcaches;
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static sem_t g_cachesem = SEM_INITIALIZER(1);
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxf_list_lock and nxf_list_unlock
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*
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* Description:
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* Get/relinquish exclusive access to the font cache list
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*
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****************************************************************************/
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static void nxf_list_lock(void)
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{
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int ret;
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/* Get exclusive access to the font cache */
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while ((ret = _SEM_WAIT(&g_cachesem)) < 0)
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{
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int errorcode = _SEM_ERRNO(ret);
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DEBUGASSERT(errorcode == EINTR || errorcode == ECANCELED);
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UNUSED(errorcode);
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}
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}
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#define nxf_list_unlock() (_SEM_POST(&g_cachesem))
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/****************************************************************************
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* Name: nxf_removecache
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*
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* Description:
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* Removes the entry 'glyph' from the font cache.
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*
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* Assumptions:
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* The caller holds the font cache list semaphore.
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*
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****************************************************************************/
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static inline void nxf_removecache(FAR struct nxfonts_fcache_s *fcache,
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FAR struct nxfonts_fcache_s *prev)
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{
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/* Remove the cache from the list. First check for removal from the head */
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if (prev == NULL)
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{
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/* Replace the head with the node following glyph */
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g_fcaches = fcache->flink;
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}
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/* No.. Remove from the head or from mid-list */
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else
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{
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prev->flink = fcache->flink;
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}
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fcache->flink = NULL;
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}
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/****************************************************************************
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* Name: nxf_cache_lock and nxf_cache_unlock
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*
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* Description:
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* Get/relinquish exclusive access to the font cache
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*
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****************************************************************************/
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static void nxf_cache_lock(FAR struct nxfonts_fcache_s *priv)
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{
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int ret;
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/* Get exclusive access to the font cache */
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while ((ret = _SEM_WAIT(&priv->fsem)) < 0)
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{
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int errorcode = _SEM_ERRNO(ret);
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DEBUGASSERT(errorcode == EINTR || errorcode == ECANCELED);
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UNUSED(errorcode);
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}
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}
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#define nxf_cache_unlock(p) (_SEM_POST(&priv->fsem))
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/****************************************************************************
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* Name: nxf_removeglyph
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*
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* Description:
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* Removes the entry 'glyph' from the font cache.
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*
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****************************************************************************/
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static inline void nxf_removeglyph(FAR struct nxfonts_fcache_s *priv,
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FAR struct nxfonts_glyph_s *glyph,
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FAR struct nxfonts_glyph_s *prev)
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{
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ginfo("fcache=%p glyph=%p\n", priv, glyph);
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/* Remove the glyph for the list. First check for removal from the head
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* (which, I think, never actually happens).
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*/
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if (prev == NULL)
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{
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/* Replace the head with the node following glyph */
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priv->head = glyph->flink;
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/* If there is no node following glyph, then the list is empty */
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if (priv->head == NULL)
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{
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priv->tail = NULL;
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}
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}
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/* Check for removal from the tail (we know that the list cannot become
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* empty in either of the next two cases).
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*/
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else if (glyph->flink == NULL)
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{
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priv->tail = prev;
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prev->flink = NULL;
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}
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/* No.. Remove from mid-list */
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else
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{
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prev->flink = glyph->flink;
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}
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glyph->flink = NULL;
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/* Decrement the count of glyphs in the font cache */
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DEBUGASSERT(priv->nglyphs > 0);
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priv->nglyphs--;
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}
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/****************************************************************************
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* Name: nxf_addglyph
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*
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* Description:
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* Add the entry 'glyph' to the head font cache list.
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*
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****************************************************************************/
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static inline void nxf_addglyph(FAR struct nxfonts_fcache_s *priv,
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FAR struct nxfonts_glyph_s *glyph)
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{
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ginfo("fcache=%p glyph=%p\n", priv, glyph);
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/* Add the glyph to the head of the list */
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glyph->flink = priv->head;
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if (priv->head == NULL)
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{
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priv->tail = glyph;
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}
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priv->head = glyph;
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/* Increment the count of glyphs in the font cache. */
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DEBUGASSERT(priv->nglyphs < priv->maxglyphs);
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priv->nglyphs++;
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}
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/****************************************************************************
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* Name: nxf_findglyph
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*
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* Description:
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* Find the glyph for the specific character 'ch' in the list of pre-
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* rendered fonts in the font cache.
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*
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* This is logically a part of nxf_cache_getglyph(). nxf_cache_getglyph()
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* will attempt to find the cached glyph before rendering a new one. So
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* this function has two unexpected side-effects: (1) If the font cache
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* is full and the font is not found, then the least-recently-used glyph
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* is deleted to make space for the new glyph that will be allocated.
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*
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* (2) If the glyph is found, then it is moved to the head of the list of
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* glyphs since it is now the most recently used (leaving the least
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* recently used glyph at the tail of the list).
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*
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* Assumptions:
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* The caller has exclusive access to the font cache.
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*
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****************************************************************************/
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static FAR struct nxfonts_glyph_s *
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nxf_findglyph(FAR struct nxfonts_fcache_s *priv, uint8_t ch)
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{
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FAR struct nxfonts_glyph_s *glyph;
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FAR struct nxfonts_glyph_s *prev;
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ginfo("fcache=%p ch=%c (%02x)\n",
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priv, (ch >= 32 && ch < 128) ? ch : '.', ch);
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/* Try to find the glyph in the list of pre-rendered glyphs */
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for (prev = NULL, glyph = priv->head;
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glyph != NULL;
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prev = glyph, glyph = glyph->flink)
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{
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/* Check if we found the glyph for this character */
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if (glyph->code == ch)
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{
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/* This is now the most recently used glyph. Move it to the head
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* of the list (if it is not already at the head of the list).
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*/
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if (prev != NULL)
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{
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nxf_removeglyph(priv, glyph, prev);
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nxf_addglyph(priv, glyph);
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}
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/* And return the glyph that we found */
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return glyph;
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}
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/* Is this the last glyph in the list? Has the cache reached its
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* limit for the number of cached fonts?
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*/
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if (glyph->flink == NULL && priv->nglyphs >= priv->maxglyphs)
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{
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/* Yes.. then remove it from the list and free the glyph memory.
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* We do this because we have all of the information in hand now
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* and we will surely need to have this space later.
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*/
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nxf_removeglyph(priv, glyph, prev);
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lib_free(glyph);
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return NULL;
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}
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}
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return NULL;
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}
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/****************************************************************************
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* Name: nxf_fillglyph
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*
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* Description:
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* Fill the glyph memory with the background color
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*
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****************************************************************************/
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static inline void nxf_fillglyph(FAR struct nxfonts_fcache_s *priv,
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FAR struct nxfonts_glyph_s *glyph)
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{
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int row;
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int col;
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UNUSED(row); /* Not used in all configurations */
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UNUSED(col);
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/* Initialize the glyph memory to the background color. */
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#if !defined(CONFIG_NXFONTS_DISABLE_1BPP) || !defined(CONFIG_NXFONTS_DISABLE_2BPP) || \
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!defined(CONFIG_NXFONTS_DISABLE_4BPP) || !defined(CONFIG_NXFONTS_DISABLE_8BPP)
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/* For pixel depths of 1, 2, 4, and 8, build up an 8-bit value containing
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* multiple background colored pixels.
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*/
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if (priv->bpp <= 8)
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{
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uint8_t pixel = (uint8_t)priv->bgcolor;
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FAR uint8_t *ptr;
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#ifndef CONFIG_NXFONTS_DISABLE_1BPP
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/* Pack a 1-bit pixel to 2 pixels */
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if (priv->bpp < 2)
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{
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/* Pack 1-bit pixels into a 2-bits */
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pixel &= 0x01;
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pixel = (pixel) << 1 | pixel;
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}
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#endif
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#if !defined(CONFIG_NXFONTS_DISABLE_1BPP) || !defined(CONFIG_NXFONTS_DISABLE_2BPP)
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/* Pack a 2-bit pixel to a 4-bit nibble */
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if (priv->bpp < 4)
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{
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/* Pack 2-bit pixels into a nibble */
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pixel &= 0x03;
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pixel = (pixel) << 2 | pixel;
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}
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#endif
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#if !defined(CONFIG_NXFONTS_DISABLE_1BPP) || !defined(CONFIG_NXFONTS_DISABLE_2BPP) || \
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!defined(CONFIG_NXFONTS_DISABLE_4BPP)
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/* Pack the 4-bit nibble into a byte */
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if (priv->bpp < 8)
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{
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pixel &= 0x0f;
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pixel = (pixel) << 4 | pixel;
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}
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#endif
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/* Then fill the glyph with the packed background color */
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ptr = (FAR uint8_t *)glyph->bitmap;
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for (row = 0; row < glyph->height; row++)
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{
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for (col = 0; col < glyph->stride; col++)
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{
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/* Transfer the packed bytes into the buffer */
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*ptr++ = pixel;
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}
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}
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}
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else
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#endif
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#if !defined(CONFIG_NXFONTS_DISABLE_16BPP)
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if (priv->bpp == 16)
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{
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FAR uint16_t *ptr = (FAR uint16_t *)glyph->bitmap;
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for (row = 0; row < glyph->height; row++)
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{
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/* Just copy the color value into the glyph memory */
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for (col = 0; col < glyph->width; col++)
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{
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*ptr++ = priv->bgcolor;
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}
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}
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}
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else
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#endif
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#ifndef CONFIG_NXFONTS_DISABLE_24BPP
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if (priv->bpp == 24)
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{
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FAR uint32_t *ptr = (FAR uint32_t *)glyph->bitmap;
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FAR uint32_t pixel[3];
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/* Get two 32-bit values for alternating 32 representations */
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pixel[0] = (uint32_t)priv->bgcolor << 8 |
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(uint32_t)priv->bgcolor >> 16;
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pixel[1] = (uint32_t)priv->bgcolor << 16 |
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(uint32_t)priv->bgcolor >> 8;
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pixel[2] = (uint32_t)priv->bgcolor << 24 |
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(uint32_t)priv->bgcolor;
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for (row = 0; row < glyph->height; row++)
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{
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/* Copy the color value into the glyph memory */
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col = 0;
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for (; ; )
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{
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*ptr++ = pixel[0];
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if (++col >= glyph->width)
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{
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break;
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}
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*ptr++ = pixel[1];
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if (++col >= glyph->width)
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{
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break;
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}
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*ptr++ = pixel[2];
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if (++col >= glyph->width)
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{
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break;
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}
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}
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}
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}
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else
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#endif
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#if !defined(CONFIG_NXFONTS_DISABLE_32BPP)
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if (priv->bpp == 32)
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{
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FAR uint32_t *ptr = (FAR uint32_t *)glyph->bitmap;
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for (row = 0; row < glyph->height; row++)
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{
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/* Just copy the color value into the glyph memory */
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for (col = 0; col < glyph->width; col++)
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{
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*ptr++ = priv->bgcolor;
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}
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}
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}
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else
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#endif
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{
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DEBUGPANIC();
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}
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}
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/****************************************************************************
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* Name: nxf_renderglyph
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*
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* Description:
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* Allocate memory for a new glyph and render the bitmap font into the
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* allocated glyph memory.
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*
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* Assumptions:
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* The caller holds the font cache semaphore.
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*
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****************************************************************************/
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static inline FAR struct nxfonts_glyph_s *
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nxf_renderglyph(FAR struct nxfonts_fcache_s *priv,
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FAR const struct nx_fontbitmap_s *fbm, uint8_t ch)
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{
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FAR struct nxfonts_glyph_s *glyph = NULL;
|
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size_t bmsize;
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unsigned int height;
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unsigned int width;
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unsigned int stride;
|
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int ret;
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ginfo("fcache=%p fbm=%p ch=%c (%02x)\n",
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priv, fbm, (ch >= 32 && ch < 128) ? ch : '.', ch);
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/* Get the size of the glyph */
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width = fbm->metric.width + fbm->metric.xoffset;
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height = fbm->metric.height + fbm->metric.yoffset;
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|
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/* Get the physical width of the glyph in bytes */
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stride = (width * priv->bpp + 7) >> 3;
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/* Allocate the glyph (always succeeds) */
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bmsize = stride * height;
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glyph = (FAR struct nxfonts_glyph_s *)
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lib_malloc(SIZEOF_NXFONTS_GLYPH_S(bmsize));
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|
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if (glyph != NULL)
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{
|
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/* Save the character code, dimensions, and physical width of the
|
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* glyph.
|
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*/
|
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glyph->code = ch;
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glyph->width = width;
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glyph->height = height;
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glyph->stride = stride;
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/* Initialize the glyph memory to the background color. */
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nxf_fillglyph(priv, glyph);
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/* Then render the glyph into the allocated, initialized memory */
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|
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ret = priv->renderer((FAR nxgl_mxpixel_t *)glyph->bitmap,
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glyph->height, glyph->width, glyph->stride,
|
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fbm, priv->fgcolor);
|
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if (ret < 0)
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{
|
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/* Actually, the renderer never returns a failure */
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|
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gerr("ERROR: nxf_renderglyph: Renderer failed\n");
|
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lib_free(glyph);
|
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return NULL;
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}
|
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|
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/* Add the new glyph to the font cache */
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|
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nxf_addglyph(priv, glyph);
|
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}
|
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|
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return glyph;
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}
|
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|
|
/****************************************************************************
|
|
* Name: nxf_findcache
|
|
*
|
|
* Description:
|
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* Find a font cache tht matches the font charcteristics.
|
|
*
|
|
* Assumptions:
|
|
* The caller holds the font cache list semaphore.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static FAR struct nxfonts_fcache_s *
|
|
nxf_findcache(enum nx_fontid_e fontid, nxgl_mxpixel_t fgcolor,
|
|
nxgl_mxpixel_t bgcolor, int bpp)
|
|
{
|
|
FAR struct nxfonts_fcache_s *fcache;
|
|
|
|
ginfo("fontid=%d fgcolor=%u bgcolor=%u bpp=%d\n",
|
|
fontid, fgcolor, bgcolor, bpp);
|
|
|
|
/* Search for a cache for this font characteristics */
|
|
|
|
for (fcache = g_fcaches; fcache != NULL; fcache = fcache->flink)
|
|
{
|
|
/* Does this font have the same characteristics? */
|
|
|
|
if (fcache->fontid == fontid &&
|
|
fcache->fgcolor == fgcolor &&
|
|
fcache->bgcolor == bgcolor &&
|
|
fcache->bpp == bpp)
|
|
{
|
|
/* Yes... return it */
|
|
|
|
ginfo("Returning fcache=%p\n", fcache);
|
|
return fcache;
|
|
}
|
|
}
|
|
|
|
ginfo("Not found\n");
|
|
return NULL;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: nxf_cache_connect
|
|
*
|
|
* Description:
|
|
* Create a new font cache for the provided 'fontid'. If the cache
|
|
* already, then just increment a reference count return the handle for
|
|
* the existing font cache.
|
|
*
|
|
* Input Parameters:
|
|
* fontid - Identifies the font supported by this cache
|
|
* fgcolor - Foreground color
|
|
* bgcolor - Background color
|
|
* bpp - Bits per pixel
|
|
* maxglyphs - Maximum number of glyphs permitted in the cache
|
|
*
|
|
* Returned Value:
|
|
* On success a non-NULL handle is returned that then may sequently be
|
|
* used with nxf_getglyph() to extract fonts from the font cache. NULL
|
|
* returned on any failure with the errno value set to indicate the nature
|
|
* of the error.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FCACHE nxf_cache_connect(enum nx_fontid_e fontid,
|
|
nxgl_mxpixel_t fgcolor, nxgl_mxpixel_t bgcolor,
|
|
int bpp, int maxglyphs)
|
|
{
|
|
FAR struct nxfonts_fcache_s *priv;
|
|
int errcode;
|
|
|
|
ginfo("fontid=%d fgcolor=%u bgcolor=%u bpp=%d maxglyphs=%d\n",
|
|
fontid, fgcolor, bgcolor, bpp, maxglyphs);
|
|
|
|
/* Get exclusive access to the font cache list */
|
|
|
|
nxf_list_lock();
|
|
|
|
/* Find a font cache with the matching font characteristics */
|
|
|
|
priv = nxf_findcache(fontid, fgcolor, bgcolor, bpp);
|
|
if (priv == NULL)
|
|
{
|
|
/* There isn't one... we will have to create a new font cache for this
|
|
* client.
|
|
*/
|
|
|
|
/* Allocate memory for the (empty) font cache */
|
|
|
|
priv = (FAR struct nxfonts_fcache_s *)
|
|
lib_zalloc(sizeof(struct nxfonts_fcache_s));
|
|
|
|
if (priv == NULL)
|
|
{
|
|
errcode = ENOMEM;
|
|
goto errout_with_lock;
|
|
}
|
|
|
|
/* Initialize the font cache */
|
|
|
|
priv->fontid = fontid;
|
|
priv->fclients = 1;
|
|
priv->maxglyphs = maxglyphs;
|
|
priv->bpp = bpp;
|
|
priv->fgcolor = fgcolor;
|
|
priv->bgcolor = bgcolor;
|
|
|
|
/* Select the rendering function */
|
|
|
|
/* Select renderer -- Some additional logic would be required to
|
|
* support pixel depths that are not directly addressable (1,2,4, and
|
|
* 24).
|
|
*/
|
|
|
|
switch (bpp)
|
|
{
|
|
#ifndef CONFIG_NXFONTS_DISABLE_1BPP
|
|
case 1:
|
|
priv->renderer = (nxf_renderer_t)nxf_convert_1bpp;
|
|
break;
|
|
#endif
|
|
#ifndef CONFIG_NXFONTS_DISABLE_2BPP
|
|
case 2:
|
|
priv->renderer = (nxf_renderer_t)nxf_convert_2bpp;
|
|
break;
|
|
#endif
|
|
#ifndef CONFIG_NXFONTS_DISABLE_4BPP
|
|
case 4:
|
|
priv->renderer = (nxf_renderer_t)nxf_convert_4bpp;
|
|
break;
|
|
#endif
|
|
#ifndef CONFIG_NXFONTS_DISABLE_8BPP
|
|
case 8:
|
|
priv->renderer = (nxf_renderer_t)nxf_convert_8bpp;
|
|
break;
|
|
#endif
|
|
#ifndef CONFIG_NXFONTS_DISABLE_16BPP
|
|
case 16:
|
|
priv->renderer = (nxf_renderer_t)nxf_convert_16bpp;
|
|
break;
|
|
#endif
|
|
#ifndef CONFIG_NXFONTS_DISABLE_24BPP
|
|
case 24:
|
|
priv->renderer = (nxf_renderer_t)nxf_convert_24bpp;
|
|
break;
|
|
#endif
|
|
#ifndef CONFIG_NXFONTS_DISABLE_32BPP
|
|
case 32:
|
|
priv->renderer = (nxf_renderer_t)nxf_convert_32bpp;
|
|
break;
|
|
#endif
|
|
default:
|
|
gerr("ERROR: Unsupported pixel depth: %d\n", bpp);
|
|
errcode = ENOSYS;
|
|
goto errout_with_fcache;
|
|
}
|
|
|
|
/* Select the font */
|
|
|
|
priv->font = nxf_getfonthandle(fontid);
|
|
if (priv->font == NULL)
|
|
{
|
|
errcode = get_errno();
|
|
gerr("ERROR: Failed to get font ID %d: %d\n", fontid, errcode);
|
|
goto errout_with_fcache;
|
|
}
|
|
|
|
/* Initialize the mutual exclusion semaphore */
|
|
|
|
_SEM_INIT(&priv->fsem, 0, 1);
|
|
|
|
/* Add the new font cache to the list of font caches */
|
|
|
|
priv->flink = g_fcaches;
|
|
g_fcaches = priv;
|
|
}
|
|
else
|
|
{
|
|
/* A font cache with these characteristics already exists. Just make
|
|
* sure that it is as least a big as the size requested.
|
|
*/
|
|
|
|
if (priv->maxglyphs < maxglyphs)
|
|
{
|
|
priv->maxglyphs = maxglyphs;
|
|
}
|
|
|
|
/* Increment the number of clients of the font cache */
|
|
|
|
priv->fclients++;
|
|
}
|
|
|
|
nxf_list_unlock();
|
|
ginfo("fhandle=%p\n", priv);
|
|
return (FCACHE)priv;
|
|
|
|
errout_with_fcache:
|
|
lib_free(priv);
|
|
|
|
errout_with_lock:
|
|
nxf_list_unlock();
|
|
set_errno(errcode);
|
|
return NULL;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: nxf_cache_disconnect
|
|
*
|
|
* Description:
|
|
* Decrement the reference count on the font cache and, if the reference
|
|
* count goes to zero, free all resources used by the font cache. The
|
|
* font handle is invalid upon return in either case.
|
|
*
|
|
* Input Parameters:
|
|
* fhandle - A font cache handle previously returned by
|
|
* nxf_cache_connect();
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
void nxf_cache_disconnect(FCACHE fhandle)
|
|
{
|
|
FAR struct nxfonts_fcache_s *priv = (FAR struct nxfonts_fcache_s *)fhandle;
|
|
FAR struct nxfonts_fcache_s *fcache;
|
|
FAR struct nxfonts_fcache_s *prev;
|
|
FAR struct nxfonts_glyph_s *glyph;
|
|
FAR struct nxfonts_glyph_s *next;
|
|
|
|
ginfo("fhandle=%p\n", fhandle);
|
|
|
|
DEBUGASSERT(priv != NULL && priv->fclients > 0);
|
|
|
|
/* Get exclusive access to the font cache */
|
|
|
|
nxf_cache_lock(priv);
|
|
|
|
/* Is this the last client of the font cache? */
|
|
|
|
if (priv->fclients <= 1)
|
|
{
|
|
/* Get exclusive access to the font cache list */
|
|
|
|
nxf_list_lock();
|
|
|
|
/* Remove the font cache from the list of caches. This is a singly
|
|
* linked list, so we must do this the hard way.
|
|
*/
|
|
|
|
for (prev = NULL, fcache = g_fcaches;
|
|
fcache != priv && fcache != NULL;
|
|
fcache = fcache->flink)
|
|
{
|
|
}
|
|
|
|
DEBUGASSERT(fcache == priv);
|
|
nxf_removecache(fcache, prev);
|
|
nxf_list_unlock();
|
|
|
|
/* Free all allocated glyph memory */
|
|
|
|
for (glyph = priv->head; glyph != NULL; glyph = next)
|
|
{
|
|
next = glyph->flink;
|
|
lib_free(glyph);
|
|
}
|
|
|
|
/* Destroy the serializing semaphore... while we are holding it? */
|
|
|
|
_SEM_DESTROY(&priv->fsem);
|
|
|
|
/* Finally, free the font cache structure itself */
|
|
|
|
lib_free(priv);
|
|
}
|
|
else
|
|
{
|
|
/* No.. just decrement the number of clients connected to the font
|
|
* cache.
|
|
*/
|
|
|
|
priv->fclients--;
|
|
nxf_cache_unlock(priv);
|
|
}
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: nxf_cache_getfonthandle
|
|
*
|
|
* Description:
|
|
* Return the handle to the font set used by this instance of the font
|
|
* cache.
|
|
*
|
|
* Input Parameters:
|
|
* fhandle - A font cache handle previously returned by
|
|
* nxf_cache_connect();
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) is returned if the metrics were
|
|
*
|
|
* Returned Value:
|
|
* One success, a non-NULL font handle is returned.
|
|
*
|
|
****************************************************************************/
|
|
|
|
NXHANDLE nxf_cache_getfonthandle(FCACHE fhandle)
|
|
{
|
|
FAR struct nxfonts_fcache_s *priv = (FAR struct nxfonts_fcache_s *)fhandle;
|
|
|
|
DEBUGASSERT(priv != NULL && priv->font != NULL);
|
|
return priv->font;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: nxf_cache_getglyph
|
|
*
|
|
* Description:
|
|
* Get the font glyph for the character code 'ch' from the font cache. If
|
|
* the glyph for that character code does not exist in the font cache, it
|
|
* be rendered.
|
|
*
|
|
* Returned Value:
|
|
* On success, a non-NULL pointer to the rendered glyph in the font cache
|
|
* is returned. NULL is returned on any failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR const struct nxfonts_glyph_s *
|
|
nxf_cache_getglyph(FCACHE fhandle, uint8_t ch)
|
|
{
|
|
FAR struct nxfonts_fcache_s *priv = (FAR struct nxfonts_fcache_s *)fhandle;
|
|
FAR struct nxfonts_glyph_s *glyph;
|
|
FAR const struct nx_fontbitmap_s *fbm;
|
|
|
|
ginfo("ch=%c (%02x)\n", (ch >= 32 && ch < 128) ? ch : '.', ch);
|
|
|
|
/* Get exclusive access to the font cache */
|
|
|
|
nxf_cache_lock(priv);
|
|
|
|
/* First, try to find the glyph in the cache of pre-rendered glyphs */
|
|
|
|
glyph = nxf_findglyph(priv, ch);
|
|
if (glyph == NULL)
|
|
{
|
|
/* No, it is not cached... Does the code map to a font? */
|
|
|
|
fbm = nxf_getbitmap(priv->font, ch);
|
|
if (fbm)
|
|
{
|
|
/* Yes.. render the glyph for the font */
|
|
|
|
glyph = nxf_renderglyph(priv, fbm, ch);
|
|
}
|
|
}
|
|
|
|
nxf_cache_unlock(priv);
|
|
return glyph;
|
|
}
|