forked from enlightenment/efl
148 lines
3.2 KiB
C
148 lines
3.2 KiB
C
#include "evas_common.h"
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FT_Library ft_lib;
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void
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evas_common_font_init(void)
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{
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static int initialised = 0;
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int error;
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if (initialised) return;
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error = FT_Init_FreeType(&ft_lib);
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if (error) return;
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initialised = 1;
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}
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int
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evas_common_font_ascent_get(RGBA_Font *fn)
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{
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int val;
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int ret;
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val = (int)fn->ft.face->ascender;
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fn->ft.face->units_per_EM = 2048; /* nasy hack - need to have correct val */
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ret = (val * fn->ft.face->size->metrics.y_scale) / (fn->ft.face->units_per_EM * fn->ft.face->units_per_EM);
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return ret;
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}
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int
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evas_common_font_descent_get(RGBA_Font *fn)
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{
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int val;
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int ret;
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val = -(int)fn->ft.face->descender;
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fn->ft.face->units_per_EM = 2048; /* nasy hack - need to have correct val */
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ret = (val * fn->ft.face->size->metrics.y_scale) / (fn->ft.face->units_per_EM * fn->ft.face->units_per_EM);
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return ret;
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}
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int
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evas_common_font_max_ascent_get(RGBA_Font *fn)
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{
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int val;
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int ret;
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val = (int)fn->ft.face->bbox.yMax;
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fn->ft.face->units_per_EM = 2048; /* nasy hack - need to have correct val */
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ret = (val * fn->ft.face->size->metrics.y_scale) / (fn->ft.face->units_per_EM * fn->ft.face->units_per_EM);
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return ret;
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}
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int
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evas_common_font_max_descent_get(RGBA_Font *fn)
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{
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int val;
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int ret;
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val = -(int)fn->ft.face->bbox.yMin;
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fn->ft.face->units_per_EM = 2048; /* nasy hack - need to have correct val */
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ret = (val * fn->ft.face->size->metrics.y_scale) / (fn->ft.face->units_per_EM * fn->ft.face->units_per_EM);
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return ret;
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}
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int
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evas_common_font_get_line_advance(RGBA_Font *fn)
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{
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int val;
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int ret;
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val = (int)fn->ft.face->height;
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fn->ft.face->units_per_EM = 2048; /* nasy hack - need to have correct val */
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ret = (val * fn->ft.face->size->metrics.y_scale) / (fn->ft.face->units_per_EM * fn->ft.face->units_per_EM);
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return ret;
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}
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int
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evas_common_font_utf8_get_next(unsigned char *buf, int *iindex)
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{
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/* Reads UTF8 bytes from @buf, starting at *@index and returns
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* the code point of the next valid code point. @index is
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* updated ready for the next call.
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*
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* Returns 0 to indicate an error (e.g. invalid UTF8)
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*/
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int index = *iindex, r;
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unsigned char d = buf[index++], d2, d3, d4;
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if (!d)
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return 0;
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if (d < 0x80)
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{
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*iindex = index;
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return d;
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}
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if ((d & 0xe0) == 0xc0)
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{
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/* 2 byte */
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d2 = buf[index++];
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if ((d2 & 0xc0) != 0x80)
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return 0;
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r = d & 0x1f; /* copy lower 5 */
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r <<= 6;
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r |= (d2 & 0x3f); /* copy lower 6 */
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}
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else if ((d & 0xf0) == 0xe0)
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{
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/* 3 byte */
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d2 = buf[index++];
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d3 = buf[index++];
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if ((d2 & 0xc0) != 0x80 ||
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(d3 & 0xc0) != 0x80)
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return 0;
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r = d & 0x0f; /* copy lower 4 */
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r <<= 6;
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r |= (d2 & 0x3f);
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r <<= 6;
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r |= (d3 & 0x3f);
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}
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else
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{
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/* 4 byte */
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d2 = buf[index++];
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d3 = buf[index++];
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d4 = buf[index++];
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if ((d2 & 0xc0) != 0x80 ||
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(d3 & 0xc0) != 0x80 ||
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(d4 & 0xc0) != 0x80)
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return 0;
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r = d & 0x0f; /* copy lower 4 */
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r <<= 6;
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r |= (d2 & 0x3f);
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r <<= 6;
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r |= (d3 & 0x3f);
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r <<= 6;
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r |= (d4 & 0x3f);
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}
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if (r < 0xdfff && d > 0xd800)
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{
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/* ill-formed says Table 3.1B in the */
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/* Unicode 3.2 std */
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return 0;
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}
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*iindex = index;
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return r;
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}
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