rt-thread-official/rtgui/common/font_hz_file.c

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/*
* Cached HZ font engine
*/
#include <rtgui/dc.h>
#include <rtgui/font.h>
#include <rtgui/tree.h>
#include <rtgui/rtgui_system.h>
#ifdef RTGUI_USING_HZ_FILE
#include <dfs_posix.h>
#define HZ_CACHE_MAX 64
static int _font_cache_compare(struct hz_cache* node1, struct hz_cache* node2);
static void rtgui_hz_file_font_load(struct rtgui_font* font);
static void rtgui_hz_file_font_draw_text(struct rtgui_font* font, struct rtgui_dc* dc, const char* text, rt_ubase_t len, struct rtgui_rect* rect);
static void rtgui_hz_file_font_get_metrics(struct rtgui_font* font, const char* text, rtgui_rect_t* rect);
struct rtgui_font_engine rtgui_hz_file_font_engine =
{
RT_NULL,
rtgui_hz_file_font_load,
rtgui_hz_file_font_draw_text,
rtgui_hz_file_font_get_metrics
};
SPLAY_PROTOTYPE(cache_tree, hz_cache, hz_node, _font_cache_compare);
SPLAY_GENERATE (cache_tree, hz_cache, hz_node, _font_cache_compare);
static int _font_cache_compare(struct hz_cache* cache_1, struct hz_cache* cache_2)
{
if (cache_1->hz_id > cache_2->hz_id) return 1;
if (cache_1->hz_id < cache_2->hz_id) return -1;
return 0;
}
static rt_uint8_t* _font_cache_get(struct rtgui_hz_file_font* font, rt_uint16_t hz_id)
{
rt_uint32_t seek;
struct hz_cache *cache, search;
search.hz_id = hz_id;
cache = SPLAY_FIND(cache_tree, &(font->cache_root), &search);
if (cache != RT_NULL)
{
/* find it */
return (rt_uint8_t*)(cache + 1);
}
/* can not find it, load to cache */
cache = (struct hz_cache*) rtgui_malloc(sizeof(struct hz_cache) + font->font_data_size);
if (cache == RT_NULL) return RT_NULL; /* no memory yet */
cache->hz_id = hz_id;
seek = 94 * (((hz_id & 0xff) - 0xA0) - 1) + ((hz_id >> 8) - 0xA0) - 1;
seek *= font->font_data_size;
/* read hz font data */
if ((lseek(font->fd, seek, SEEK_SET) < 0) ||
read(font->fd, (char*)(cache + 1), font->font_data_size) !=
font->font_data_size)
{
rtgui_free(cache);
return RT_NULL;
}
/* insert to cache */
SPLAY_INSERT(cache_tree, &(font->cache_root), cache);
font->cache_size ++;
if (font->cache_size > HZ_CACHE_MAX)
{
/* remove a cache */
struct hz_cache* left;
left = SPLAY_LEFT(font->cache_root.sph_root, hz_node);
while (SPLAY_LEFT(left, hz_node) != RT_NULL) left = SPLAY_LEFT(left, hz_node);
/* remove the left node */
SPLAY_REMOVE(cache_tree, &(font->cache_root), left);
font->cache_size --;
}
return (rt_uint8_t*)(cache + 1);
}
static void rtgui_hz_file_font_load(struct rtgui_font* font)
{
struct rtgui_hz_file_font* hz_file_font = (struct rtgui_hz_file_font*)font->data;
RT_ASSERT(hz_file_font != RT_NULL);
hz_file_font->fd = open(hz_file_font->font_fn, O_RDONLY, 0);
}
static void rtgui_hz_file_font_draw_text(struct rtgui_font* font, struct rtgui_dc* dc, const char* text, rt_ubase_t len, struct rtgui_rect* rect)
{
rt_base_t h;
rt_uint8_t* str;
struct rtgui_hz_file_font* hz_file_font = (struct rtgui_hz_file_font*)font->data;
RT_ASSERT(hz_file_font != RT_NULL);
/* drawing height */
h = (hz_file_font->font_size + rect->y1 > rect->y2)?
rect->y2 - rect->y1 : hz_file_font->font_size;
str = (rt_uint8_t*)text;
while (len > 0 && rect->x1 < rect->x2)
{
const rt_uint8_t* font_ptr;
register rt_base_t i, j, k;
/* get font pixel data */
font_ptr = _font_cache_get(hz_file_font, *str | (*(str+1) << 8));
/* draw word */
for (i=0; i < h; i ++)
{
for (j=0; j < 2; j++)
for (k=0; k < 8; k++)
{
if ( ((font_ptr[i*2 + j] >> (7-k)) & 0x01) != 0 &&
(rect->x1 + 8 * j + k < rect->x2))
{
rtgui_dc_draw_point(dc, rect->x1 + 8*j + k, rect->y1 + i);
}
}
}
/* move x to next character */
rect->x1 += hz_file_font->font_size;
str += 2;
len -= 2;
}
}
static void rtgui_hz_file_font_get_metrics(struct rtgui_font* font, const char* text, rtgui_rect_t* rect)
{
struct rtgui_hz_file_font* hz_file_font = (struct rtgui_hz_file_font*)font->data;
RT_ASSERT(hz_file_font != RT_NULL);
/* set metrics rect */
rect->x1 = rect->y1 = 0;
rect->x2 = (rt_int16_t)(hz_file_font->font_size/2 * rt_strlen((const char*)text));
rect->y2 = hz_file_font->font_size;
}
#endif