forked from enlightenment/efl
265 lines
5.6 KiB
C
265 lines
5.6 KiB
C
#include "evas_common.h"
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FT_Library evas_ft_lib = 0;
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static int initialised = 0;
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EAPI void
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evas_common_font_init(void)
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{
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int error;
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initialised++;
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if (initialised != 1) return;
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error = FT_Init_FreeType(&evas_ft_lib);
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if (error)
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{
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initialised--;
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return;
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}
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}
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EAPI void
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evas_common_font_shutdown(void)
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{
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int error;
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initialised--;
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if (initialised != 0) return;
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error = FT_Done_FreeType(evas_ft_lib);
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}
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EAPI int
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evas_common_font_ascent_get(RGBA_Font *fn)
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{
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int val, dv;
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int ret;
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RGBA_Font_Int *fi;
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evas_common_font_size_use(fn);
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fi = fn->fonts->data;
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val = (int)fi->src->ft.face->size->metrics.ascender;
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if (fi->src->ft.face->units_per_EM == 0)
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return val;
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dv = (fi->src->ft.orig_upem * 2048) / fi->src->ft.face->units_per_EM;
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ret = (val * fi->src->ft.face->size->metrics.y_scale) / (dv * dv);
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return ret;
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}
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EAPI int
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evas_common_font_descent_get(RGBA_Font *fn)
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{
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int val, dv;
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int ret;
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RGBA_Font_Int *fi;
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evas_common_font_size_use(fn);
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fi = fn->fonts->data;
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val = -(int)fi->src->ft.face->size->metrics.descender;
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if (fi->src->ft.face->units_per_EM == 0)
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return val;
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dv = (fi->src->ft.orig_upem * 2048) / fi->src->ft.face->units_per_EM;
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ret = (val * fi->src->ft.face->size->metrics.y_scale) / (dv * dv);
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return ret;
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}
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EAPI int
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evas_common_font_max_ascent_get(RGBA_Font *fn)
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{
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int val, dv;
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int ret;
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RGBA_Font_Int *fi;
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evas_common_font_size_use(fn);
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fi = fn->fonts->data;
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val = (int)fi->src->ft.face->bbox.yMax;
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if (fi->src->ft.face->units_per_EM == 0)
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return val;
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dv = (fi->src->ft.orig_upem * 2048) / fi->src->ft.face->units_per_EM;
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ret = (val * fi->src->ft.face->size->metrics.y_scale) / (dv * dv);
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return ret;
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}
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EAPI int
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evas_common_font_max_descent_get(RGBA_Font *fn)
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{
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int val, dv;
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int ret;
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RGBA_Font_Int *fi;
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evas_common_font_size_use(fn);
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fi = fn->fonts->data;
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val = -(int)fi->src->ft.face->bbox.yMin;
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if (fi->src->ft.face->units_per_EM == 0)
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return val;
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dv = (fi->src->ft.orig_upem * 2048) / fi->src->ft.face->units_per_EM;
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ret = (val * fi->src->ft.face->size->metrics.y_scale) / (dv * dv);
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return ret;
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}
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EAPI int
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evas_common_font_get_line_advance(RGBA_Font *fn)
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{
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int val, dv;
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int ret;
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RGBA_Font_Int *fi;
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evas_common_font_size_use(fn);
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fi = fn->fonts->data;
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val = (int)fi->src->ft.face->size->metrics.height;
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if (fi->src->ft.face->units_per_EM == 0)
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return val;
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dv = (fi->src->ft.orig_upem * 2048) / fi->src->ft.face->units_per_EM;
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ret = (val * fi->src->ft.face->size->metrics.y_scale) / (dv * dv);
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return ret;
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}
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EAPI 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 decoded code point at iindex offset, and advances iindex
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* to the next code point after this.
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*
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* Returns 0 to indicate there is no next char
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*/
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int index = *iindex, len, r;
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unsigned char d, d2, d3, d4;
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d = buf[index++];
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if (!d)
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return 0;
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while (buf[index] && ((buf[index] & 0xc0) == 0x80))
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index++;
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len = index - *iindex;
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if (len == 1)
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r = d;
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else if (len == 2)
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{
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/* 2 bytes */
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d2 = buf[*iindex + 1];
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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 (len == 3)
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{
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/* 3 bytes */
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d2 = buf[*iindex + 1];
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d3 = buf[*iindex + 2];
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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 bytes */
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d2 = buf[*iindex + 1];
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d3 = buf[*iindex + 2];
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d4 = buf[*iindex + 3];
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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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*iindex = index;
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return r;
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}
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EAPI int
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evas_common_font_utf8_get_prev(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 decoded code point at iindex offset, and advances iindex
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* to the prev code point after this.
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*
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* Returns 0 to indicate there is no prev char
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*/
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int index = *iindex, len, r;
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unsigned char d, d2, d3, d4;
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if (index <= 0)
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return 0;
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d = buf[index--];
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while ((index > 0) && ((buf[index] & 0xc0) == 0x80))
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index--;
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len = *iindex - index;
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if (len == 1)
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r = d;
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else if (len == 2)
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{
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/* 2 bytes */
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d2 = buf[index + 1];
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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 (len == 3)
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{
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/* 3 bytes */
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d2 = buf[index + 1];
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d3 = buf[index + 2];
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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 bytes */
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d2 = buf[index + 1];
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d3 = buf[index + 2];
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d4 = buf[index + 3];
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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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*iindex = index;
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return r;
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}
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EAPI int
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evas_common_font_utf8_get_last(unsigned char *buf, int buflen)
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{
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/* jumps to the nul byte at the buffer end and decodes backwards and
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* returns the offset index byte in the buffer where the last character
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* in the buffer begins.
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*
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* Returns -1 to indicate an error
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*/
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int index;
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unsigned char d;
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if (buflen < 1) return 0;
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index = buflen - 1;
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d = buf[index];
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if (!(d & 0x80))
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return index;
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else
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{
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while (index > 0)
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{
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index--;
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d = buf[index];
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if ((d & 0xc0) != 0x80)
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return index;
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}
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}
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return 0;
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}
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