font_bmp.c 5.6 KB

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  1. /*
  2. * File : font.c
  3. * This file is part of RT-Thread RTOS
  4. * COPYRIGHT (C) 2006 - 2010, RT-Thread Development Team
  5. *
  6. * The license and distribution terms for this file may be
  7. * found in the file LICENSE in this distribution or at
  8. * http://www.rt-thread.org/license/LICENSE
  9. *
  10. * Change Logs:
  11. * Date Author Notes
  12. * 2010-09-15 Bernard first version
  13. */
  14. #include <rtgui/font.h>
  15. #include <rtgui/dc.h>
  16. /* bitmap font private data */
  17. 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);
  18. static void rtgui_bitmap_font_get_metrics(struct rtgui_font *font, const char *text, rtgui_rect_t *rect);
  19. const struct rtgui_font_engine bmp_font_engine =
  20. {
  21. RT_NULL,
  22. RT_NULL,
  23. rtgui_bitmap_font_draw_text,
  24. rtgui_bitmap_font_get_metrics
  25. };
  26. void rtgui_bitmap_font_draw_char(struct rtgui_font_bitmap *font, struct rtgui_dc *dc, const char ch,
  27. rtgui_rect_t *rect)
  28. {
  29. rtgui_color_t bc;
  30. const rt_uint8_t *font_ptr;
  31. rt_uint16_t x, y, w, h, style;
  32. register rt_base_t i, j, /*k,*/ word_bytes;
  33. /* check first and last char */
  34. if (ch < font->first_char || ch > font->last_char) return;
  35. /* get text style */
  36. style = rtgui_dc_get_gc(dc)->textstyle;
  37. bc = rtgui_dc_get_gc(dc)->background;
  38. x = rect->x1;
  39. y = rect->y1;
  40. /* get width */
  41. if (font->char_width == RT_NULL)
  42. {
  43. word_bytes = (((font->width - 1) / 8) + 1);
  44. font_ptr = font->bmp + (ch - font->first_char) * word_bytes * font->height;
  45. }
  46. else
  47. {
  48. word_bytes = ((font->char_width[ch - font->first_char] - 1) / 8) + 1;
  49. font_ptr = font->bmp + font->offset[ch - font->first_char];
  50. }
  51. w = (font->width + x > rect->x2) ? rect->x2 - rect->x1 : font->width;
  52. h = (font->height + y > rect->y2) ? rect->y2 - rect->y1 : font->height;
  53. for (i = 0; i < h; i++)
  54. {
  55. rt_uint8_t chr = 0;
  56. const rt_uint8_t *ptr = font_ptr + i * word_bytes;
  57. for (j = 0; j < w; j++)
  58. {
  59. if (j % 8 == 0)
  60. chr = *ptr++;
  61. if (chr & 0x80)
  62. rtgui_dc_draw_point(dc, j + x, i + y);
  63. else if (style & RTGUI_TEXTSTYLE_DRAW_BACKGROUND)
  64. rtgui_dc_draw_color_point(dc, j + x, i + y, bc);
  65. chr <<= 1;
  66. }
  67. }
  68. }
  69. static void rtgui_bitmap_font_draw_text(struct rtgui_font *font, struct rtgui_dc *dc,
  70. const char *text, rt_ubase_t len, struct rtgui_rect *rect)
  71. {
  72. rt_uint32_t length;
  73. struct rtgui_font_bitmap *bmp_font = (struct rtgui_font_bitmap *)(font->data);
  74. #ifdef RTGUI_USING_FONTHZ
  75. struct rtgui_font *hz_font;
  76. RT_ASSERT(bmp_font != RT_NULL);
  77. if (rect->y1 > rect->y2) return;
  78. hz_font = rtgui_font_refer("hz", font->height);
  79. while ((rect->x1 < rect->x2) && len)
  80. {
  81. length = 0;
  82. while ((rt_uint8_t) * (text + length) >= 0x80) length ++; /* it's not a ascii character */
  83. if (length > 0)
  84. {
  85. if (hz_font != RT_NULL) rtgui_font_draw(hz_font, dc, text, length, rect);
  86. text += length;
  87. len -= length;
  88. }
  89. length = 0;
  90. while (((rt_uint8_t) * (text + length) < 0x80) && *(text + length)) length ++;
  91. if (length > 0)
  92. {
  93. len -= length;
  94. while (length-- && rect->x1 < rect->x2)
  95. {
  96. rtgui_bitmap_font_draw_char(bmp_font, dc, *text, rect);
  97. /* move x to next character */
  98. if (bmp_font->char_width == RT_NULL)
  99. rect->x1 += bmp_font->width;
  100. else
  101. rect->x1 += bmp_font->char_width[*text - bmp_font->first_char];
  102. text ++;
  103. }
  104. }
  105. }
  106. if (hz_font != RT_NULL) rtgui_font_derefer(hz_font);
  107. #else
  108. if (rect->y1 > rect->y2) return;
  109. while ((rect->x1 < rect->x2) && len)
  110. {
  111. length = 0;
  112. while (((rt_uint8_t) * (text + length) < 0x80) && *(text + length)) length ++;
  113. if (length > 0)
  114. {
  115. len -= length;
  116. while (length-- && rect->x1 < rect->x2)
  117. {
  118. rtgui_bitmap_font_draw_char(bmp_font, dc, *text, rect);
  119. /* move x to next character */
  120. if (bmp_font->char_width == RT_NULL)
  121. rect->x1 += bmp_font->width;
  122. else
  123. rect->x1 += bmp_font->char_width[*text - bmp_font->first_char];
  124. text ++;
  125. }
  126. }
  127. }
  128. #endif
  129. }
  130. static void rtgui_bitmap_font_get_metrics(struct rtgui_font *font, const char *text, rtgui_rect_t *rect)
  131. {
  132. rt_uint32_t length;
  133. struct rtgui_font_bitmap *bmp_font = (struct rtgui_font_bitmap *)(font->data);
  134. RT_ASSERT(bmp_font != RT_NULL);
  135. /* set init metrics rect */
  136. rect->x1 = rect->y1 = 0;
  137. rect->x2 = 0;
  138. rect->y2 = bmp_font->height;
  139. while (*text)
  140. {
  141. length = 0;
  142. while ((rt_uint8_t) * (text + length) >= 0x80) length ++; /* it's not a ascii character */
  143. rect->x2 += (font->height / 2) * length;
  144. text += length;
  145. length = 0;
  146. while (((rt_uint8_t) * (text + length) < 0x80) && *(text + length)) length ++;
  147. if (bmp_font->char_width != NULL)
  148. {
  149. /* get width for each character */
  150. while (*text && ((rt_uint8_t)*text < 0x80))
  151. {
  152. rect->x2 += bmp_font->char_width[*text - bmp_font->first_char];
  153. text ++;
  154. }
  155. }
  156. else
  157. {
  158. /* set metrics rect */
  159. rect->x2 += bmp_font->width * length;
  160. text += length;
  161. }
  162. }
  163. }