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));
	}
}

static void rtgui_bitmap_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_bitmap_font_get_metrics(struct rtgui_font* font, const char* text, rtgui_rect_t* rect);
struct rtgui_font_engine bmp_font_engine =
{
	RT_NULL,
	RT_NULL,
	rtgui_bitmap_font_draw_text,
	rtgui_bitmap_font_get_metrics
};

void rtgui_bitmap_font_draw_char(struct rtgui_font_bitmap* font, struct rtgui_dc* dc, const char ch,
	rtgui_rect_t* rect)
{
	const rt_uint8_t* font_ptr;
	rt_uint16_t x, y, h;
	register rt_base_t i, j, k, word_bytes;

	/* check first and last char */
	if (ch < font->first_char || ch > font->last_char) return;

	x = rect->x1;
	y = rect->y1;
	word_bytes = (((font->width - 1) / 8) + 1);

	font_ptr = font->bmp + (ch - font->first_char) * word_bytes * font->height;

	h = (font->height + y > rect->y2) ? rect->y2 - rect->y1 : font->height;

	for (i = 0; i < h; i++)
	{
		for (j = 0; j < word_bytes; j++)
		{
			for (k = 0; k < 8; k++)
			{
				if (((font_ptr[i * word_bytes + j] >> (7 - k)) & 0x01) != 0)
				{
					/* draw a pixel */
					rtgui_dc_draw_point(dc, k + 8 * j + x, i + y);
				}
			}
		}
	}
}

static void rtgui_bitmap_font_draw_text(struct rtgui_font* font, struct rtgui_dc* dc, const char* text, rt_ubase_t len, struct rtgui_rect* rect)
{
	struct rtgui_font_bitmap* bmp_font = (struct rtgui_font_bitmap*)(font->data);

	RT_ASSERT(bmp_font != RT_NULL);

	while (len-- && rect->x1 < rect->x2)
	{
		rtgui_bitmap_font_draw_char(bmp_font, dc, *text, rect);

		/* move x to next character */
		rect->x1 += bmp_font->width;
		text ++;
	}
}

static void rtgui_bitmap_font_get_metrics(struct rtgui_font* font, const char* text, rtgui_rect_t* rect)
{
	struct rtgui_font_bitmap* bmp_font = (struct rtgui_font_bitmap*)(font->data);

	RT_ASSERT(bmp_font != RT_NULL);

	/* set metrics rect */
	rect->x1 = rect->y1 = 0;
	rect->x2 = bmp_font->width * (rt_int16_t)rt_strlen((const char*)text);
	rect->y2 = bmp_font->height;
}