rt-thread-official/components/rtgui/common/font.c

/*
 * File      : font.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006 - 2009, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rt-thread.org/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2009-10-16     Bernard      first version
 */
#include <rtgui/font.h>
#include <rtgui/dc.h>

static rtgui_list_t _rtgui_font_list;
static struct rtgui_font* rtgui_default_font;

extern struct rtgui_font rtgui_font_asc16;
extern struct rtgui_font rtgui_font_arial16;
extern struct rtgui_font rtgui_font_asc12;
extern struct rtgui_font rtgui_font_arial12;
#ifdef RTGUI_USING_FONTHZ
extern struct rtgui_font rtgui_font_hz16;
extern struct rtgui_font rtgui_font_hz12;
#endif

void rtgui_font_system_init()
{
	rtgui_list_init(&(_rtgui_font_list));

	/* set default font to NULL */
	rtgui_default_font = RT_NULL;

#ifdef RTGUI_USING_FONT16
	rtgui_font_system_add_font(&rtgui_font_asc16);
#ifdef RTGUI_USING_FONTHZ
	rtgui_font_system_add_font(&rtgui_font_hz16);
#endif
#endif

#ifdef RTGUI_USING_FONT12
	rtgui_font_system_add_font(&rtgui_font_asc12);
#ifdef RTGUI_USING_FONTHZ
	rtgui_font_system_add_font(&rtgui_font_hz12);
#endif
#endif

#ifdef RTGUI_USING_FONT12
	if (rtgui_default_font == RT_NULL)
		rtgui_font_set_defaut(&rtgui_font_asc12);
#endif
#ifdef RTGUI_USING_FONT16
	if (rtgui_default_font == RT_NULL)
		rtgui_font_set_defaut(&rtgui_font_asc16);
#endif
}

void rtgui_font_system_add_font(struct rtgui_font* font)
{
	rtgui_list_init(&(font->list));
	rtgui_list_append(&_rtgui_font_list, &(font->list));

	/* init font */
	if (font->engine->font_init != RT_NULL)
		font->engine->font_init(font);

	/* first refer, load it */
	if (font->engine->font_load != RT_NULL)
		font->engine->font_load(font);
}

void rtgui_font_system_remove_font(struct rtgui_font* font)
{
	rtgui_list_remove(&_rtgui_font_list, &(font->list));
}

struct rtgui_font* rtgui_font_default()
{
	return rtgui_default_font;
}

void rtgui_font_set_defaut(struct rtgui_font* font)
{
	rtgui_default_font = font;
}

struct rtgui_font* rtgui_font_refer(const rt_uint8_t* family, rt_uint16_t height)
{
	/* search font */
	struct rtgui_list_node* node;
	struct rtgui_font* font;

	rtgui_list_foreach(node, &_rtgui_font_list)
	{
		font = rtgui_list_entry(node, struct rtgui_font, list);
		if ((rt_strncmp((const char*)font->family, (const char*)family, RTGUI_NAME_MAX) == 0) &&
			font->height == height)
		{
			font->refer_count ++;
			return font;
		}
	}

	return RT_NULL;
}

void rtgui_font_derefer(struct rtgui_font* font)
{
	RT_ASSERT(font != RT_NULL);

	font->refer_count --;

	/* no refer, remove font */
	if (font->refer_count == 0)
	{
		rtgui_font_system_remove_font(font);
	}
}

/* draw a text */
void rtgui_font_draw(struct rtgui_font* font, struct rtgui_dc* dc, const char* text, rt_ubase_t len, struct rtgui_rect* rect)
{
	RT_ASSERT(font != RT_NULL);

	if (font->engine != RT_NULL &&
		font->engine->font_draw_text != RT_NULL)
	{
		font->engine->font_draw_text(font, dc, text, len, rect);
	}
}

int rtgui_font_get_string_width(struct rtgui_font* font, const char* text)
{
	rtgui_rect_t rect;

	/* get metrics */
	rtgui_font_get_metrics(font, text, &rect);

	return rect.x2 - rect.x1;
}

void rtgui_font_get_metrics(struct rtgui_font* font, const char* text, rtgui_rect_t* rect)
{
	RT_ASSERT(font != RT_NULL);

	if (font->engine != RT_NULL &&
		font->engine->font_get_metrics != RT_NULL)
	{
		font->engine->font_get_metrics(font, text, rect);
	}
	else
	{
		/* no font engine found, set rect to zero */
		rt_memset(rect, 0, sizeof(rtgui_rect_t));
	}
}