TFT fonts and zones

[bilbo60]

Hello,

some useful routines could be implemented for the displays such as

int char_width( char c) returning under the selected font the real displayed width of the char

int text_width( char *s) returning the width of the text , giving the opportunity to center the text easely

or simply give us a pointer to the font header with a description of a such header to get access to the width info for each char

and for the bitmap ones

at least a pixel color readback .

also can you think for a bitblt like action for displaying chars, text, ...


regards

[filip]

Hi,

Thank you for your suggestion, I will pass them to our developers.

Regards,
Filip.

[hooper]

Right Bitblt might be very useful for graph drawing:
On arrival of a new sample you can use it to shift the whole graph one pixel to the left and
make room for the display of the new sample.

[aCkO]

Here you go:

Prototypes:

Code: Select all

char TFT_Char_Width(char c, const char *font);
int  TFT_Text_Width(char *txt, const char *font);

Code:

Code: Select all

char TFT_Char_Width(char c, const char *font) {
   unsigned int MinID = *(unsigned int *)&font[2];
   unsigned int MaxID = *(unsigned int *)&font[4];
   
   if (!(MinID <= c && c <= MaxID))
      return 0;
   else
      return font[8 + 4 * (c - MinID)];
}

int TFT_Text_Width(char *txt, const char *font) {
   int width = 0;
   
   while (*txt)
      width += TFT_Char_Width(*txt++, font) + 1;

   return width;
}

Examples:

Code: Select all

char ch_width = TFT_Char_Width('A', &Tahoma11x13_Regular);
int txt_width = TFT_Text_Width("Hello world", &Tahoma11x13_Regular);

Regards

[vt23]

I like the bilbo60's suggestion:

and for the bitmap ones

at least a pixel color readback .

also can you think for a bitblt like action for displaying chars, text, ...

Is there any progress?
1. Mainly a pixel color readback is useful. It would return the color at required (entered) pixel position (x, y).
2. Or to have a function which return x, y coordinates of the first occurrence of required color. There can be also parametrs to enter a position of start of searching.

Regards

VT

[Aleksandar.Mitrovic]

Hi,

Unfortunately in the latest version of compiler we didn't make major changes. Only minor updates.
Our Developers are working on the new version of VisualTFT at this moment.

I will pass your suggestion for further consideration to our Development team.

Best regards,
Aleksandar

[vt23]

Hello Aleksandar.Mitrovic,

I think we have solved the issue of pixel readback together with user peini already (see topic "Idea for font anti-aliasing on displays"). We've done it for very popular controller ILI9341 and it works well. It is very useful for aCkO's BitPack library for anti-aliased fonts.

Regards
Vitek