Add demo application.

[bertos.git] / gfx / text_format.c

diff --git a/gfx/text_format.c b/gfx/text_format.c
index c59a3af9141cd81442d05f6773319e2ca5ac4bc4..54dab7c866e373e8c7a6d1c596237b50ace63aee 100755 (executable)
--- a/gfx/text_format.c
+++ b/gfx/text_format.c
@@ -15,6 +15,18 @@
 
 /*#*
  *#* $Log$
+ *#* Revision 1.8  2006/03/22 09:50:11  bernie
+ *#* Don't use C99 stuff.
+ *#*
+ *#* Revision 1.7  2006/03/20 17:51:55  bernie
+ *#* Cleanups.
+ *#*
+ *#* Revision 1.6  2006/03/13 02:05:54  bernie
+ *#* Mark slow paths as UNLIKELY.
+ *#*
+ *#* Revision 1.5  2006/03/07 22:18:04  bernie
+ *#* Correctly compute text width for prop fonts; Make styles a per-bitmap attribute.
+ *#*
  *#* Revision 1.4  2006/02/10 12:31:33  bernie
  *#* Add multiple font support in bitmaps.
  *#*
@@ -160,7 +172,7 @@ int PGM_FUNC(text_xprintf)(struct Bitmap *bm,
        text_moveto(bm, row, col);
 
        if (style & STYLEF_MASK)
-               oldstyle = text_style(style, STYLEF_MASK);
+               oldstyle = text_style(bm, style, STYLEF_MASK);
 
        if (style & (TEXT_CENTER | TEXT_RIGHT))
        {
@@ -185,12 +197,66 @@ int PGM_FUNC(text_xprintf)(struct Bitmap *bm,
 
        /* Restore old style */
        if (style & STYLEF_MASK)
-               text_style(oldstyle, STYLEF_MASK);
+               text_style(bm, oldstyle, STYLEF_MASK);
 
        return len;
 }
 
 
+struct TextWidthData
+{
+       Bitmap *bitmap;
+       coord_t width;
+};
+
+/**
+ * Compute width in pixels of a character.
+ *
+ * Compute the on screen width of a character, taking the
+ * current style and font into account.
+ *
+ * The width is accumulated in the WidthData structure
+ * passed as second argument.
+ *
+ * This is a formatted_write() callback used by text_vwidthf()
+ * to compute the length of a formatted string.
+ */
+static int text_charWidth(int c, struct TextWidthData *twd)
+{
+       unsigned char index = (unsigned char)c;
+       Bitmap *bm = twd->bitmap;
+       coord_t glyph_width;
+
+
+       if (UNLIKELY(!FONT_HAS_GLYPH(bm->font, index)))
+       {
+               if (!FONT_HAS_GLYPH(bm->font, '?'))
+                       index = '?';
+               else
+                       index = bm->font->first;
+       }
+
+       /* Make character relative to font start */
+       index -= bm->font->first;
+
+       if (bm->font->offset)
+               /* Proportional font */
+               glyph_width = bm->font->widths[index]; /* TODO: optimize away */
+       else
+               /* Fixed width font */
+               glyph_width = bm->font->width;
+
+       if (bm->styles & STYLEF_CONDENSED)
+               --glyph_width;
+
+       if (bm->styles & STYLEF_EXPANDED)
+               glyph_width *= 2;
+
+       twd->width += glyph_width;
+
+       return c;
+}
+
 /*!
  * Return the width in pixels of a vprintf()-formatted string.
  */
@@ -199,7 +265,17 @@ int PGM_FUNC(text_vwidthf)(
        const char * PGM_ATTR fmt,
        va_list ap)
 {
-       return PGM_FUNC(vsprintf)(NULL, fmt, ap) * bm->font->width;
+       /* Fixed font with no styles affecting the width? */
+       if (!bm->font->offset && !(bm->styles & (STYLEF_CONDENSED | STYLEF_EXPANDED)))
+               return PGM_FUNC(vsprintf)(NULL, fmt, ap) * bm->font->width;
+       else
+       {
+               struct TextWidthData twd;
+               twd.bitmap = bm;
+               twd.width = 0;
+               _formatted_write(fmt, (void (*)(char, void *))text_charWidth, &twd, ap);
+               return twd.width;
+       }
 }