rt-thread/components/rtgui/common/font_bmp.c

184 lines
4.7 KiB
C

/*
* File : font.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2010, 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
* 2010-09-15 Bernard first version
*/
#include <rtgui/font.h>
#include <rtgui/dc.h>
/* bitmap font private data */
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);
const 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)
{
rtgui_color_t bc;
const rt_uint8_t* font_ptr;
rt_uint16_t x, y, w, h, style;
register rt_base_t i, j, /*k,*/ word_bytes;
/* check first and last char */
if (ch < font->first_char || ch > font->last_char) return;
/* get text style */
style = rtgui_dc_get_gc(dc)->textstyle;
bc = rtgui_dc_get_gc(dc)->background;
x = rect->x1;
y = rect->y1;
/* get width */
if (font->char_width == RT_NULL)
{
word_bytes = (((font->width - 1) / 8) + 1);
font_ptr = font->bmp + (ch - font->first_char) * word_bytes * font->height;
}
else
{
word_bytes = ((font->char_width[ch - font->first_char] - 1)/8) + 1;
font_ptr = font->bmp + font->offset[ch - font->first_char];
}
w = (font->width + x > rect->x2) ? rect->x2 - rect->x1 : font->width;
h = (font->height + y > rect->y2) ? rect->y2 - rect->y1 : font->height;
for(i = 0; i < h; i++)
{
rt_uint8_t chr;
const rt_uint8_t *ptr = font_ptr + i * word_bytes;
for(j = 0; j < w; j++)
{
if(j % 8 == 0)chr = *ptr++;
if(chr & 0x80)
rtgui_dc_draw_point(dc, j + x, i + y);
else if (style & RTGUI_TEXTSTYLE_DRAW_BACKGROUND)
rtgui_dc_draw_color_point(dc, j + x, i + y, bc);
chr <<= 1;
}
}
}
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)
{
rt_uint32_t length;
struct rtgui_font_bitmap* bmp_font = (struct rtgui_font_bitmap*)(font->data);
#ifdef RTGUI_USING_FONTHZ
struct rtgui_font* hz_font;
RT_ASSERT(bmp_font != RT_NULL);
if (rect->y1 > rect->y2) return;
hz_font = rtgui_font_refer("hz", font->height);
while ((rect->x1 < rect->x2) && len)
{
length = 0;
while ((rt_uint8_t)*(text + length) >= 0x80) length ++; /* it's not a ascii character */
if (length > 0)
{
if (hz_font != RT_NULL) rtgui_font_draw(hz_font, dc, text, length, rect);
text += length;
len -= length;
}
length = 0;
while (((rt_uint8_t)*(text + length) < 0x80) && *(text + length)) length ++;
if (length > 0)
{
len -= length;
while (length-- && rect->x1 < rect->x2)
{
rtgui_bitmap_font_draw_char(bmp_font, dc, *text, rect);
/* move x to next character */
if (bmp_font->char_width == RT_NULL)
rect->x1 += bmp_font->width;
else
rect->x1 += bmp_font->char_width[*text - bmp_font->first_char];
text ++;
}
}
}
if (hz_font != RT_NULL) rtgui_font_derefer(hz_font);
#else
if (rect->y1 > rect->y2) return;
while ((rect->x1 < rect->x2) && len)
{
length = 0;
while (((rt_uint8_t)*(text + length) < 0x80) && *(text + length)) length ++;
if (length > 0)
{
len -= length;
while (length-- && rect->x1 < rect->x2)
{
rtgui_bitmap_font_draw_char(bmp_font, dc, *text, rect);
/* move x to next character */
if (bmp_font->char_width == RT_NULL)
rect->x1 += bmp_font->width;
else
rect->x1 += bmp_font->char_width[*text - bmp_font->first_char];
text ++;
}
}
}
#endif
}
static void rtgui_bitmap_font_get_metrics(struct rtgui_font* font, const char* text, rtgui_rect_t* rect)
{
rt_uint32_t length;
struct rtgui_font_bitmap* bmp_font = (struct rtgui_font_bitmap*)(font->data);
RT_ASSERT(bmp_font != RT_NULL);
/* set init metrics rect */
rect->x1 = rect->y1 = 0;rect->x2 = 0;
rect->y2 = bmp_font->height;
while (*text)
{
length = 0;
while (*(text + length) >= 0x80) length ++; /* it's not a ascii character */
rect->x2 += (font->height/2) * length;
text += length;
length = 0;
while ((*(text + length) < 0x80) && *(text + length)) length ++;
if (bmp_font->char_width != NULL)
{
/* get width for each character */
while (*text && (*text < 0x80))
{
rect->x2 += bmp_font->char_width[*text - bmp_font->first_char];
text ++;
}
}
else
{
/* set metrics rect */
rect->x2 += bmp_font->width * length;
text += length;
}
}
}