lvgl / lv_utils Goto Github PK

Convert images or system fonts to C arrays. Written for LVGL embedded GUI library

PHP 70.82% Ruby 29.18%

convert-pictures font image-converter pixel-font littlevgl lvgl

lv_utils's Introduction

Arcihed because both the font converter and the image converter are replaced with more advanced Node.js based converters**

Utilities for use with LVGL

5.3- font converter

The old 5.x font converter (using PHP) was removed in January 2020 as it is no longer compatible with modern versions of LittlevGL. The last commit containing it is ec7d2676b36a27fa13b21162aca1476ad8456ec5.

Overview

This repository houses a number of converter utilities for LittlevGL. Note that the 6.0+ TTF/OTF font converter has its own repository at https://github.com/littlevgl/lv_font_conv.

Image converter: https://littlevgl.com/image-to-c-array
Hex font converter

Here you you can see how they work or download them to run offline.

Get started

This guide shows how to use the converters offline in a command line on Linux

Install PHP: sudo apt-get install php7.2-cli
Intall extensions

2.a For the Image manipulator: sudo apt-get install php7.2-gd

Clone or download the lv_utils repository: git clone https://github.com/littlevgl/lv_utils.git
Go to the lv_utils directory.

For Mac OSX using Homebrew

Because the php version installed by xcode might not have the GD graphics library installed, you need to install the Homebrew version. Once installed, you will need to find where it was installed and reference the complete path to php when running the commands shown on this page. The example below in step 4 happened to be the installation location on my Mac for php version 7.3.3.

Install xcode: install via the app store
Install xcode CLI tools: xcode-select --install
Install PHP: brew install php
Check the install: /usr/local/Cellar/php/7.3.3/bin/php --version
Continue with step 3 in the installation instructions for Linux

Run the Image converter offline

Copy a BMP, JPG or PNG file you want to use into the lv_utils directory
Run the script: php img_conv_core.php "name=wallpaper&img=red_flower.png"
Chek the created C file in lv_utils directory.

The required arguments of the script:

name name of the output file and image
img an image file

Optional arguments:

cf color format. Possible values are: true_color, true_color_alpha, true_color_chroma, indexed_1, indexed_2, indexed_4, indexed_8, alpha_1, alpha_2, alpha_4, alpha_8, raw, raw_alpha, raw_chroma. The default is: true_color.
format C array or Binary output. Possible values are: c_array, bin_332, bin_565, bin_565_swap, bin_888. Default is: c_array.

Note: You may need to increase memory_limit in php.ini if PHP reports an error similar to this:

PHP Fatal error:  Allowed memory size of 134217728 bytes exhausted (tried to allocate 21570880 bytes) in lv_utils/img_conv_core.php`

Example with all options

Convert a bunny.png with alpha for all pixels to C array: php img_conv_core.php "name=icon&img=bunny.png&format=c_array&cf=true_color_alpha"

Using the generated image in LVGL

For C arrays
- Copy the result C file into your LittlevGL project
- In a C file of your application declare the image as: extern const lv_img_t my_image_name; or LV_IMG_DECLARE(my_image_name);
- Set the image for an lv_img object: lv_img_set_src(img1, &my_image_name);
For externally binary files (e.g. SD card)
- Set up a new driver. To learn more read the Tutorial.
- Set the image for an lv_img object: lv_img_set_src(img1, "S:/path/to/image");

lv_utils's People

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lv_utils's Issues

Problem with image converter

Hello,
I have just tried the image converter to get a logo picture with a lot of white background and was very disappointed, the generated c array was wrong. I have tried different image formats (png, bmp) from different software tools (Paint.net, XNView) but without success. As I mentioned, the picture has a lot of white background, but the generated array was full of
0x05, 0x00, 0x05, 0x00, 0x05, 0x00, 0x05, 0x00, 0x05, 0x00, ...
I have used 16 bit color depth, so it seems more to be black. And it was also displayed as a black rectangle.
I have tried to put some 0xff, 0xff to the generated array and got the right result - white color for the corrected area.
Probably it is something wrong with the converter. I have taken a look at the source code, may be it cann't convert bitmaps with 32 bits color encoding? Just guessing.

file bdf_font_converter.py seems too old

Hello,

I want to use bdf in my littlevGL program to show some small fonts on small screen.

but the file converted by bdf_font_converter.py cannot be loaded. Is there any other way to convert BDF files?

Regards!

Font generate binary

For Chinese characters, in general, font files are quite large, so the generated C files are quite large. Can provide functions of generating binary files?

PHP Fatal when trying to convert a jpg image

Installation :

I cloned the repo on Fedora 31 and I installed php 7 with php-gd

Problem :

I can not convert a big jpg image the command line php img_conv_core.php "name=wallpaper&img=my_image.jpg"
Where my_image.jpg is 72kB ends with :

PHP Fatal error:  Allowed memory size of 134217728 bytes exhausted (tried to allocate 21570880 bytes) in lv_utils/img_conv_core.php on line 339

A conversion for a 31kB image is working.

EDIT :
With another jpg file of 15kB :

PHP Fatal error:  Allowed memory size of 134217728 bytes exhausted (tried to allocate 67108872 bytes) in lv_utils/img_conv_core.php on line 451

(same error but line is different)

[spec] font convertor

Dev memo, to remember important parts.

Desired features

Allow define fonts by URL.
- we need Roboto for Material UI.
- it's convenient to not store local copies of binaries
- google's fonts is nice source for start
Allow specify font params (size, weight, italic, ...)
Specify glyphs
- single glyphs (multiple times)
  - remapping (how?)
- numeric range (multiple times)
  - remapping (how?)
- named set (usually by language - acsii, simplified chinese)
[reserved] should be able to process kerning table & drop unused data
Easy to install & web support
- node.js + webpack or parcel.js
Possibility to process glyph lists from lv_i18n
- probably not direct part of this script, but we should verify possibility of this use case.
As usually, should allow read options from file.

CLI params.

Font params are grouped to current font until new font option found.

Common:

-s - output font size
-o - output file path
-b, --bpp - bits per pixel
-c, --compress - 'auto', compression algorythm (TBD)
- RLE in general, but details depent on bpp & font size
--format - output format, useful for debug & experiments (TBD)

Fonts:

--font - local path or URL
-r - range
- AAAA - single value, in dec or hex (0xAAAA) form
- AAAA-BBBB - range (also with dec/hex support)

TBD

Do we need options for weight/italic or those are stored in separate files?
How to define glyph codes remap?
- single: AAAA->newAAA,
- range: AAAA-BBBB->newAAA_start
how to define chars directly (without codes)
named sets (ascii, latin, cyrilic, ...)?

Feedback usage font converter

Hi, i recently used your tools to get a better font and symbol for small display. Impressive tools to get directly a standard ttf to generate any font possible.
My remarks:
I think we should add more built-in font to match different screen type. I found the "Terminus" which is well suited to small oled screens for example.

I do not think I did the right thing to add a font. I directly modify the files lv_font.c, lv_font.h to integrate my fonts as if they were already included in lvgl. What is the simply way ? Or maybe a user can not just call some "registration function" in this own program ? ( Range / Array / ...)

I noticed that the online tools do not generate the case of non-ASCII characters. I add manually:

#if LV_TXT_UTF8
    .unicode_first = 61440, First Unicode letter in this font * /
    .unicode_last = 62190, Last Unicode letter in this font * /
#else
    .unicode_first = 192, First Unicode letter in this font * /
    .unicode_last = 241, Last Unicode letter in this font * /
#endif

I had a problem when generating my symbols, I had to directly modify the sources at the end of the file from:

    .unicode_list = symbol_unicode_list,	/*List of unicode characters*/
    .get_bitmap = lv_font_get_bitmap_sparse,	/*Function pointer to get glyph's bitmap*/
    .get_width = lv_font_get_width_sparse,	/*Function pointer to get glyph's width*/

to:

    .unicode_list = NULL, / * List of unicode characters * /
    .get_bitmap = lv_font_get_bitmap_continuous, / * Function pointer to get glyph's bitmap * /
    .get_width = lv_font_get_width_continuous, / * Function pointer to get glyph's width * /

Another minor remark. Associate fonts of different size as for example to associate "lv_font_dejavu_20" and "lv_font_symbol_10" will make appear another part of another symbol because fonts files don't get the same pixel height size. Is it worth adding a size control according to the range of fonts registration? e.g:
32-126 => size 14
192-241 => size 18
it is maybe not a necessary upgrade.

Thank you for this tool :)

font converter and monospace fonts

Font converter is using ttf fonts, and when trying to convert the unscii fonts, the monospace characteristic of the font is lost.
Can you add a converter that will retain the fixed width, perhaps decoding the .hex file format of the font.

Littlevgl.com

online converter site is down again :(

Cannot covert Noto Emoji

Hi there,

I'm trying to covert the Noto Emoji font to bitmap with this tool. Then I've got a problem.

Here's what the char map supposed to be:

Here's the conversion result:

My configuration is:

I've tried ticking the "Convert compatible symbol font". It works, but only a certain range of the symbol are converted.

Here are the font file and the result:

NotoEmoji-Regular.ttf.zip

noto_emoji_50.c.zip

Regards,
Jackson

the Online Image to C Array Converter has bug in converting images to binary files

Im going to use the Online Image to C Array Converter to convert to a jpg image to Binary RGB565.
unfortunately the converter has bug in in converting images to binary files.

Can the old font converters be removed from this repository?

We've kept the old font converters in this repository for a while now. Documentation for them takes up a lot of space in the README, and it appears that most people are using 6.x now.

How about we remove them from the repository, but leave a link to the commit prior to their removal in the README?

Utils review/revisit

I try to understand, how to automate things. For example - rebuild fonts after translations update, language add or fontface change. Usually all commands are stored in makefile (or anything else).

When i see this repo content, my thougts are:

3 different languages????
php is certaintly NOT thing i wish to install :). And glued params with & - not what i expect from CLI tool.

I could try to rewrite everything "right" with nodejs/browser, but will not maintain this forever. Could you explain me your requirements and expectations?

Is is acceptable to use JS for CLI (node.js)? (some people not like it, and python is already installed in most linux systems)
How critical is to have easy install for native windows CLI? node-canvas is so-so there... But:
- Last windows seems to have embedded ubuntu in console (don't know details)
- Web version not affected
Do you have some not implemented but very liked features?

As a nice bonus: web version will not require server side scripts at all.

Colors inverted between online tool and offline tool with indexed_4 / 16 colors

Differents results between online tool and offline tool with indexed_4 / 16 colors

Details

With same image and options (indexed_4 offline is equivalent to Indexed 16 colors online and c_array) with online tool I got a background of 0xff which is normal but with offline tool I got a background of 0x11.

~~0x00 do not move all other values are inverted.~~
Pixels are not the same see example at the end of message

Line used on CLI :

php img_conv_core.php "name=image&img=image.png&cf=indexed_4"

Thanks

Example

These are 3 lines extracted of the converted files :

Online

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Offline

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Font generator generates lv_font_t initialisation in wrong order

The font generator generates the initialisation for the lv_font_t object in the wrong order, causing a compiler error.

Generated order:

lv_font_t arial_bold_15 = 
{
    .unicode_first = 32,	/*First Unicode letter in this font*/
    .unicode_last = 126,	/*Last Unicode letter in this font*/
    .h_px = 15,				/*Font height in pixels*/
    .glyph_bitmap = arial_bold_15_glyph_bitmap,	/*Bitmap of glyphs*/
    .glyph_dsc = arial_bold_15_glyph_dsc,		/*Description of glyphs*/
    .glyph_cnt = 95,			/*Number of glyphs in the font*/
    .unicode_list = NULL,	/*Every character in the font from 'unicode_first' to 'unicode_last'*/
    .get_bitmap = lv_font_get_bitmap_continuous,	/*Function pointer to get glyph's bitmap*/
    .get_width = lv_font_get_width_continuous,	/*Function pointer to get glyph's width*/
#if USE_ARIAL_BOLD_15 == 1
    .bpp = 1,				/*Bit per pixel*/
 #elif USE_ARIAL_BOLD_15 == 2
    .bpp = 2,				/*Bit per pixel*/
 #elif USE_ARIAL_BOLD_15 == 4
    .bpp = 4,				/*Bit per pixel*/
 #elif USE_ARIAL_BOLD_15 == 8
    .bpp = 8,				/*Bit per pixel*/
#endif
    .monospace = 0,				/*Fix width (0: if not used)*/
    .next_page = NULL,		/*Pointer to a font extension*/
};

Correct order from lv_font.h:

typedef struct _lv_font_struct
{
    uint32_t unicode_first;
    uint32_t unicode_last;
    const uint8_t * glyph_bitmap;
    const lv_font_glyph_dsc_t * glyph_dsc;
    const uint32_t * unicode_list;
    const uint8_t * (*get_bitmap)(const struct _lv_font_struct *,uint32_t);     /*Get a glyph's  bitmap from a font*/
    int16_t (*get_width)(const struct _lv_font_struct *,uint32_t);        /*Get a glyph's with with a given font*/
    struct _lv_font_struct * next_page;    /*Pointer to a font extension*/
    uint32_t h_px       :8;
    uint32_t bpp        :4;                /*Bit per pixel: 1, 2 or 4*/
    uint32_t monospace  :8;                /*Fix width (0: normal width)*/
    uint16_t glyph_cnt;                    /*Number of glyphs (letters) in the font*/
} lv_font_t;

lv_utils for nodejs

Hello everyone,

I'm working on a personal iot project where I have objects connecting to a server (stack running on symfony) to download an image and display it on a screen. For the moment, each object downloads directly the image as a bin array. That bin array is generated directly from the server. To perform the conversion, I'm using the lv_utils library that you provide.

I'm in the process of moving my stack to aws using serverless (with lambda) in javascript (nodejs). Is there any chance that this library is available in nodejs or could I find an equivalent library somewhere?

Thanks in advance for your help,
Hous

a document page not found

following link page not found:
https://docs.littlevgl.com/en/html/overview/overview/object#screen-the-most-basic-parent

image converter throws syntax errors

i tried to run the image converter with both a jpg and png file from my windows terminal (command: python image_conv.py test.png 16 0 )

but got a syntax error as response(?)


C:\Users\Ramon\Downloads\lv_utils-master\lv_utils-master\img_conv>python img_con
v.py nice.png
  File "img_conv.py", line 14
    print "No inputfile. Usage: ", sys.argv[0], " filename [OPTIONAL color depth
 (8/16/24)]"
                                ^
SyntaxError: invalid syntax

this is with python 3.6 by the way.

LV_ATTRIBUTE_MEM_ALIGN in font converter

https://github.com/littlevgl/lv_utils/blob/bb8954ed13822c50ce6545112d1e40bdbb57fc3a/font_conv_core.php#L212

Do we need the LV_ATTRIBUTE_MEM_ALIGN attribute here as well?

font_conv_core.php has undefined variable

line 450, $x_mono_ofs is undefined

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