119 lines
3.0 KiB
C
119 lines
3.0 KiB
C
/*
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* File : font.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2010, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2010-09-15 Bernard first version
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*/
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#include <rtgui/font.h>
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#include <rtgui/dc.h>
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/* bitmap font private data */
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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);
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static void rtgui_bitmap_font_get_metrics(struct rtgui_font* font, const char* text, rtgui_rect_t* rect);
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const struct rtgui_font_engine bmp_font_engine =
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{
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RT_NULL,
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RT_NULL,
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rtgui_bitmap_font_draw_text,
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rtgui_bitmap_font_get_metrics
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};
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void rtgui_bitmap_font_draw_char(struct rtgui_font_bitmap* font, struct rtgui_dc* dc, const char ch,
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rtgui_rect_t* rect)
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{
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const rt_uint8_t* font_ptr;
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rt_uint16_t x, y, h;
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register rt_base_t i, j, k, word_bytes;
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/* check first and last char */
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if (ch < font->first_char || ch > font->last_char) return;
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x = rect->x1;
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y = rect->y1;
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/* get width */
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if (font->char_width == RT_NULL)
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{
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word_bytes = (((font->width - 1) / 8) + 1);
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font_ptr = font->bmp + (ch - font->first_char) * word_bytes * font->height;
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}
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else
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{
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word_bytes = ((font->char_width[ch - font->first_char] - 1)/8) + 1;
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font_ptr = font->bmp + font->offset[ch - font->first_char];
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}
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h = (font->height + y > rect->y2) ? rect->y2 - rect->y1 : font->height;
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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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{
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for (k = 0; k < 8; k++)
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{
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if (((font_ptr[i * word_bytes + j] >> (7 - k)) & 0x01) != 0)
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{
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/* draw a pixel */
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rtgui_dc_draw_point(dc, k + 8 * j + x, i + y);
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}
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}
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}
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}
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}
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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)
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{
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struct rtgui_font_bitmap* bmp_font = (struct rtgui_font_bitmap*)(font->data);
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RT_ASSERT(bmp_font != RT_NULL);
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while (len-- && rect->x1 < rect->x2)
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{
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rtgui_bitmap_font_draw_char(bmp_font, dc, *text, rect);
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/* move x to next character */
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if (bmp_font->char_width == RT_NULL)
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rect->x1 += bmp_font->width;
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else
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rect->x1 += bmp_font->char_width[*text - bmp_font->first_char];
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text ++;
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}
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}
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static void rtgui_bitmap_font_get_metrics(struct rtgui_font* font, const char* text, rtgui_rect_t* rect)
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{
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struct rtgui_font_bitmap* bmp_font = (struct rtgui_font_bitmap*)(font->data);
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RT_ASSERT(bmp_font != RT_NULL);
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if (bmp_font->char_width != NULL)
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{
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rt_uint32_t index;
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/* set metrics rect */
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rect->x1 = rect->y1 = 0;rect->x2 = 0;
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rect->y2 = bmp_font->height;
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/* get width for each character */
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while (*text)
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{
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rect->x2 += bmp_font->char_width[*text - bmp_font->first_char];
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text ++;
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}
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}
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else
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{
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/* set metrics rect */
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rect->x1 = rect->y1 = 0;
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rect->x2 = bmp_font->width * (rt_int16_t)rt_strlen((const char*)text);
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rect->y2 = bmp_font->height;
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}
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}
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