Changeset d63623f in mainline for uspace/lib/gfxfont/src/text.c

Timestamp:

2021-07-16T17:45:12Z (3 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

4afb6c9

Parents:

61bf9dd9

Message:

Seeking in entry text using mouse

File:

• uspace/lib/gfxfont/src/text.c (modified) (6 diffs)

uspace/lib/gfxfont/src/text.c

@@ -1 +1 @@
 /*
- * Copyright (c) 2020 Jiri Svoboda
+ * Copyright (c) 2021 Jiri Svoboda
  * All rights reserved.
  *
@@ -167 +167 @@
 }
 
-/** Render text.
+/** Get text starting position.
  *
  * @param font Font
@@ -173 +173 @@
  * @param fmt Text formatting
  * @param str String
+ * @param spos Place to store starting position
+ * @return EOK on success or an error code
+ */
+void gfx_text_start_pos(gfx_font_t *font, gfx_coord2_t *pos,
+    gfx_text_fmt_t *fmt, const char *str, gfx_coord2_t *spos)
+{
+        gfx_font_metrics_t fmetrics;
+        gfx_coord2_t cpos;
+        gfx_coord_t width;
+
+        *spos = *pos;
+
+        /* Adjust position for horizontal alignment */
+        if (fmt->halign != gfx_halign_left) {
+                width = gfx_text_width(font, str);
+                switch (fmt->halign) {
+                case gfx_halign_center:
+                        spos->x -= width / 2;
+                        break;
+                case gfx_halign_right:
+                        spos->x -= width - 1;
+                        break;
+                default:
+                        break;
+                }
+        }
+
+        /* Adjust position for vertical alignment */
+        gfx_font_get_metrics(font, &fmetrics);
+
+        if (fmt->valign != gfx_valign_baseline) {
+                switch (fmt->valign) {
+                case gfx_valign_top:
+                        spos->y += fmetrics.ascent;
+                        break;
+                case gfx_valign_center:
+                        spos->y += fmetrics.ascent / 2;
+                        break;
+                case gfx_valign_bottom:
+                        cpos.y -= fmetrics.descent;
+                        break;
+                default:
+                        break;
+                }
+        }
+}
+
+/** Render text.
+ *
+ * @param font Font
+ * @param pos Anchor position
+ * @param fmt Text formatting
+ * @param str String
  * @return EOK on success or an error code
  */
@@ -178 +231 @@
     gfx_text_fmt_t *fmt, const char *str)
 {
-        gfx_font_metrics_t fmetrics;
         gfx_glyph_metrics_t gmetrics;
         size_t stradv;
@@ -184 +236 @@
         gfx_glyph_t *glyph;
         gfx_coord2_t cpos;
-        gfx_coord_t width;
         errno_t rc;
 
-        cpos = *pos;
-
-        /* Adjust position for horizontal alignment */
-        if (fmt->halign != gfx_halign_left) {
-                width = gfx_text_width(font, str);
-                switch (fmt->halign) {
-                case gfx_halign_center:
-                        cpos.x -= width / 2;
-                        break;
-                case gfx_halign_right:
-                        cpos.x -= width - 1;
-                        break;
-                default:
-                        break;
-                }
-        }
-
-        /* Adjust position for vertical alignment */
-        gfx_font_get_metrics(font, &fmetrics);
-
-        if (fmt->valign != gfx_valign_baseline) {
-                switch (fmt->valign) {
-                case gfx_valign_top:
-                        cpos.y += fmetrics.ascent;
-                        break;
-                case gfx_valign_center:
-                        cpos.y += fmetrics.ascent / 2;
-                        break;
-                case gfx_valign_bottom:
-                        cpos.y -= fmetrics.descent;
-                        break;
-                default:
-                        break;
-                }
-        }
+        gfx_text_start_pos(font, pos, fmt, str, &cpos);
 
         /* Text mode */
@@ -252 +269 @@
 }
 
+/** Find character position in string by X coordinate.
+ *
+ * @param font Font
+ * @param pos Anchor position
+ * @param fmt Text formatting
+ * @param str String
+ * @param fpos Position for which we need to find offset
+ *
+ * @return Byte offset in @a str of character corresponding to position
+ *         @a fpos. Note that the position is rounded, that is,
+ *         if it is before the center of character A, it will return
+ *         offset of A, if it is after the center of A, it will return
+ *         offset of the following character.
+ */
+size_t gfx_text_find_pos(gfx_font_t *font, gfx_coord2_t *pos,
+    gfx_text_fmt_t *fmt, const char *str, gfx_coord2_t *fpos)
+{
+        gfx_glyph_metrics_t gmetrics;
+        size_t stradv;
+        const char *cp;
+        gfx_glyph_t *glyph;
+        gfx_coord2_t cpos;
+        size_t off;
+        size_t strsize;
+        errno_t rc;
+
+        gfx_text_start_pos(font, pos, fmt, str, &cpos);
+
+        /* Text mode */
+        if ((font->finfo->props.flags & gff_text_mode) != 0) {
+                off = 0;
+                strsize = str_size(str);
+                while (off < strsize) {
+                        if (fpos->x <= cpos.x)
+                                return off;
+                        (void) str_decode(str, &off, strsize);
+                        cpos.x++;
+                }
+
+                return off;
+        }
+
+        cp = str;
+        off = 0;
+        while (*cp != '\0') {
+                rc = gfx_font_search_glyph(font, cp, &glyph, &stradv);
+                if (rc != EOK) {
+                        ++cp;
+                        continue;
+                }
+
+                gfx_glyph_get_metrics(glyph, &gmetrics);
+
+                if (fpos->x < cpos.x + gmetrics.advance / 2)
+                        return off;
+
+                cp += stradv;
+                off += stradv;
+                cpos.x += gmetrics.advance;
+        }
+
+        return off;
+}
+
 /** @}
  */