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