Changes in uspace/lib/gfxfont/src/text.c [0d62c10:f2d4a46] in mainline

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) 2022 Jiri Svoboda
  * All rights reserved.
  *
@@ -35 +35 @@
 
 #include <errno.h>
+#include <gfx/bitmap.h>
+#include <gfx/color.h>
 #include <gfx/font.h>
 #include <gfx/glyph.h>
+#include <gfx/render.h>
 #include <gfx/text.h>
+#include <io/pixelmap.h>
 #include <mem.h>
+#include <str.h>
+#include "../private/font.h"
+#include "../private/typeface.h"
 
 /** Initialize text formatting structure.
@@ -66 +73 @@
         gfx_coord_t width;
         errno_t rc;
+
+        if ((font->finfo->props.flags & gff_text_mode) != 0)
+                return str_width(str);
 
         width = 0;
@@ -85 +95 @@
 }
 
-/** Render text.
- *
- * @param font Font
+/** Print string using text characters in text mode.
+ *
+ * @param pos Position of top-left corner of text
+ * @param fmt Formatting
+ * @param str String
+ * @return EOK on success or an error code
+ */
+static errno_t gfx_puttext_textmode(gfx_coord2_t *pos, gfx_text_fmt_t *fmt,
+    const char *str)
+{
+        gfx_context_t *gc = fmt->font->typeface->gc;
+        gfx_bitmap_params_t params;
+        gfx_bitmap_t *bitmap;
+        gfx_bitmap_alloc_t alloc;
+        gfx_coord_t width;
+        uint8_t attr;
+        pixelmap_t pmap;
+        gfx_coord_t x;
+        gfx_coord_t rmargin;
+        pixel_t pixel;
+        char32_t c;
+        size_t off;
+        bool ellipsis;
+        errno_t rc;
+
+        width = str_width(str);
+        if (fmt->abbreviate && width > fmt->width) {
+                ellipsis = true;
+                width = fmt->width;
+                if (width > 3)
+                        rmargin = width - 3;
+                else
+                        rmargin = width;
+        } else {
+                ellipsis = false;
+                rmargin = width;
+        }
+
+        /*
+         * NOTE: Creating and destroying bitmap each time is not probably
+         * the most efficient way.
+         */
+
+        gfx_color_get_ega(fmt->color, &attr);
+
+        gfx_bitmap_params_init(&params);
+        params.rect.p0.x = 0;
+        params.rect.p0.y = 0;
+        params.rect.p1.x = width;
+        params.rect.p1.y = 1;
+
+        if (params.rect.p1.x == 0) {
+                /* Nothing to do. Avoid creating bitmap of zero width. */
+                return EOK;
+        }
+
+        rc = gfx_bitmap_create(gc, &params, NULL, &bitmap);
+        if (rc != EOK)
+                return rc;
+
+        rc = gfx_bitmap_get_alloc(bitmap, &alloc);
+        if (rc != EOK) {
+                gfx_bitmap_destroy(bitmap);
+                return rc;
+        }
+
+        pmap.width = params.rect.p1.x;
+        pmap.height = 1;
+        pmap.data = alloc.pixels;
+
+        off = 0;
+        for (x = 0; x < rmargin; x++) {
+                c = str_decode(str, &off, STR_NO_LIMIT);
+                pixel = PIXEL(attr,
+                    (c >> 16) & 0xff,
+                    (c >> 8) & 0xff,
+                    c & 0xff);
+                pixelmap_put_pixel(&pmap, x, 0, pixel);
+        }
+
+        if (ellipsis) {
+                for (x = rmargin; x < params.rect.p1.x; x++) {
+                        c = '.';
+                        pixel = PIXEL(attr,
+                            (c >> 16) & 0xff,
+                            (c >> 8) & 0xff,
+                            c & 0xff);
+                        pixelmap_put_pixel(&pmap, x, 0, pixel);
+                }
+        }
+
+        rc = gfx_bitmap_render(bitmap, NULL, pos);
+
+        gfx_bitmap_destroy(bitmap);
+        return rc;
+}
+
+/** Get text starting position.
+ *
  * @param pos Anchor position
  * @param fmt Text formatting
  * @param str String
+ * @param spos Place to store starting position
+ */
+void gfx_text_start_pos(gfx_coord2_t *pos, gfx_text_fmt_t *fmt,
+    const char *str, gfx_coord2_t *spos)
+{
+        gfx_font_metrics_t fmetrics;
+        gfx_coord_t width;
+
+        *spos = *pos;
+
+        /* Adjust position for horizontal alignment */
+        if (fmt->halign != gfx_halign_left) {
+                /* Compute text width */
+                width = gfx_text_width(fmt->font, str);
+                if (fmt->abbreviate && width > fmt->width)
+                        width = fmt->width;
+
+                switch (fmt->halign) {
+                case gfx_halign_center:
+                        spos->x -= width / 2;
+                        break;
+                case gfx_halign_right:
+                        spos->x -= width;
+                        break;
+                default:
+                        break;
+                }
+        }
+
+        /* Adjust position for vertical alignment */
+        gfx_font_get_metrics(fmt->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:
+                        spos->y -= fmetrics.descent + 1;
+                        break;
+                default:
+                        break;
+                }
+        }
+}
+
+/** Render text.
+ *
+ * @param pos Anchor position
+ * @param fmt Text formatting
+ * @param str String
  * @return EOK on success or an error code
  */
-errno_t gfx_puttext(gfx_font_t *font, gfx_coord2_t *pos,
-    gfx_text_fmt_t *fmt, const char *str)
-{
+errno_t gfx_puttext(gfx_coord2_t *pos, gfx_text_fmt_t *fmt, const char *str)
+{
+        gfx_glyph_metrics_t gmetrics;
         gfx_font_metrics_t fmetrics;
+        size_t stradv;
+        const char *cp;
+        gfx_glyph_t *glyph;
+        gfx_coord2_t cpos;
+        gfx_coord2_t spos;
+        gfx_rect_t rect;
+        gfx_coord_t width;
+        gfx_coord_t rmargin;
+        bool ellipsis;
+        errno_t rc;
+
+        gfx_text_start_pos(pos, fmt, str, &spos);
+
+        /* Text mode */
+        if ((fmt->font->finfo->props.flags & gff_text_mode) != 0)
+                return gfx_puttext_textmode(&spos, fmt, str);
+
+        rc = gfx_set_color(fmt->font->typeface->gc, fmt->color);
+        if (rc != EOK)
+                return rc;
+
+        width = gfx_text_width(fmt->font, str);
+
+        if (fmt->abbreviate && width > fmt->width) {
+                /* Need to append ellipsis */
+                ellipsis = true;
+                rmargin = spos.x + fmt->width - gfx_text_width(fmt->font, "...");
+        } else {
+                ellipsis = false;
+                rmargin = spos.x + width;
+        }
+
+        cpos = spos;
+        cp = str;
+        while (*cp != '\0') {
+                rc = gfx_font_search_glyph(fmt->font, cp, &glyph, &stradv);
+                if (rc != EOK) {
+                        ++cp;
+                        continue;
+                }
+
+                gfx_glyph_get_metrics(glyph, &gmetrics);
+
+                /* Stop if we would run over the right margin */
+                if (fmt->abbreviate && cpos.x + gmetrics.advance > rmargin)
+                        break;
+
+                rc = gfx_glyph_render(glyph, &cpos);
+                if (rc != EOK)
+                        return rc;
+
+                cp += stradv;
+                cpos.x += gmetrics.advance;
+        }
+
+        /* Text underlining */
+        if (fmt->underline) {
+                gfx_font_get_metrics(fmt->font, &fmetrics);
+
+                rect.p0.x = spos.x;
+                rect.p0.y = spos.y + fmetrics.underline_y0;
+                rect.p1.x = cpos.x;
+                rect.p1.y = spos.y + fmetrics.underline_y1;
+
+                rc = gfx_fill_rect(fmt->font->typeface->gc, &rect);
+                if (rc != EOK)
+                        return rc;
+        }
+
+        /* Render ellipsis, if required */
+        if (ellipsis) {
+                rc = gfx_font_search_glyph(fmt->font, ".", &glyph, &stradv);
+                if (rc != EOK)
+                        return EOK;
+
+                gfx_glyph_get_metrics(glyph, &gmetrics);
+
+                rc = gfx_glyph_render(glyph, &cpos);
+                if (rc != EOK)
+                        return rc;
+
+                cpos.x += gmetrics.advance;
+
+                rc = gfx_glyph_render(glyph, &cpos);
+                if (rc != EOK)
+                        return rc;
+
+                cpos.x += gmetrics.advance;
+
+                rc = gfx_glyph_render(glyph, &cpos);
+                if (rc != EOK)
+                        return rc;
+        }
+
+        return EOK;
+}
+
+/** Find character position in string by X coordinate.
+ *
+ * @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_coord2_t *pos, gfx_text_fmt_t *fmt,
+    const char *str, gfx_coord2_t *fpos)
+{
         gfx_glyph_metrics_t gmetrics;
         size_t stradv;
@@ -102 +375 @@
         gfx_glyph_t *glyph;
         gfx_coord2_t cpos;
-        gfx_coord_t width;
+        size_t off;
+        size_t strsize;
         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;
-                        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(pos, fmt, str, &cpos);
+
+        /* Text mode */
+        if ((fmt->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);
+                rc = gfx_font_search_glyph(fmt->font, cp, &glyph, &stradv);
                 if (rc != EOK) {
                         ++cp;
@@ -151 +406 @@
                 gfx_glyph_get_metrics(glyph, &gmetrics);
 
-                rc = gfx_glyph_render(glyph, &cpos);
-                if (rc != EOK)
-                        return rc;
+                if (fpos->x < cpos.x + gmetrics.advance / 2)
+                        return off;
 
                 cp += stradv;
+                off += stradv;
                 cpos.x += gmetrics.advance;
         }
 
-        return EOK;
+        return off;
+}
+
+/** Get text continuation parameters.
+ *
+ * Return the anchor position and format needed to continue printing
+ * text after the specified string. It is allowed for the sources
+ * (@a pos, @a fmt) and destinations (@a cpos, @a cfmt) to point
+ * to the same objects, respectively.
+ *
+ * @param pos Anchor position
+ * @param fmt Text formatting
+ * @param str String
+ * @param cpos Place to store anchor position for continuation
+ * @param cfmt Place to store format for continuation
+ */
+void gfx_text_cont(gfx_coord2_t *pos, gfx_text_fmt_t *fmt, const char *str,
+    gfx_coord2_t *cpos, gfx_text_fmt_t *cfmt)
+{
+        gfx_coord2_t spos;
+        gfx_text_fmt_t tfmt;
+
+        /* Continuation should start where the current string ends */
+        gfx_text_start_pos(pos, fmt, str, &spos);
+        cpos->x = spos.x + gfx_text_width(fmt->font, str);
+        cpos->y = spos.y;
+
+        /*
+         * Formatting is the same, except the text should be aligned
+         * so that it starts at the anchor point.
+         */
+        tfmt = *fmt;
+        tfmt.halign = gfx_halign_left;
+        tfmt.valign = gfx_valign_baseline;
+
+        /* Remaining available width */
+        tfmt.width = fmt->width - (cpos->x - spos.x);
+
+        *cfmt = tfmt;
+}
+
+/** Get text bounding rectangle.
+ *
+ * @param pos Anchor position
+ * @param fmt Text formatting
+ * @param str String
+ * @param rect Place to store bounding rectangle
+ */
+void gfx_text_rect(gfx_coord2_t *pos, gfx_text_fmt_t *fmt, const char *str,
+    gfx_rect_t *rect)
+{
+        gfx_coord2_t spos;
+        gfx_coord_t width;
+
+        gfx_text_start_pos(pos, fmt, str, &spos);
+        width = gfx_text_width(fmt->font, str);
+        if (fmt->abbreviate && width > fmt->width)
+                width = fmt->width;
+
+        rect->p0.x = spos.x;
+        rect->p0.y = spos.y - fmt->font->metrics.ascent;
+        rect->p1.x = spos.x + width;
+        rect->p1.y = spos.y +  fmt->font->metrics.descent + 1;
 }