Home

(lib)fl_imgtk

What is fl_imgtk ?

• fl_imgtk is a shorten word for "FLTK image toolkit".

What supports to do ?

• You can change many things to do on Fl_RGB_Image.
• Currently supports these:
  1. Flipping images
  2. Rotating images in any degree with minimal pixel modulating.
  3. Rescale(or resize) in many filters: nearest, bicubic, lanczos, B-Splie.
  4. Tone mapping (HDRi) for Drago and Reinhard
  5. Kernel matrix filters
  6. Contrast, Gamma, Bright control.
  7. Draws Fl_Widget to Fl_RGB_Image easily.
  8. Make blurred Fl_Widget image to Fl_RGB_Image as you can use in background blurred image for beautiful GUI.

Limits

• My C++ code designed to get maximize optimized by compiler level with many options.
• But without compiler power, ther's no fastest way now.
• Recommend to use OpenMP (is availed) and Fast-Math with AVX architecture( Intel and AMD x86 base )

License

• MIT License, yeah !

Referenced

• Some algorithms from FreeImage3 library
• Desinged for FLTK, and it follows FLTK License.

Color format issue

• FLTK has indexed color within 255 from 0, like FL_BLACK, FL_WHITE or FL_xx .
• fl_imgtk don't convert colors !
• fl_imgtk only has this byte orders to expression color space : 0xRRGGBBAA.
• If you want to convert color space from index, use Fl::get_color();, and refer to fl_cmap.h.
• When you got 24bit color from Fl::get_color(), then need to do this uint32_t flimgtk_color = Fl::get_color( FL_RED ) | 0x000000FF;
• Always fltk returns non-alpha mask, but fl_imgtk matter alpha depth, 0x00 to 0xFF.

For Raspberry Pi 3 users:

• It should be possible to build with modified Makefile from Makefile.gcc.
  1. Make sure already built fltk-1.3.4-2-ts for your Rasberry Pi3 in your board.
  2. Copy Makefile.gcc to Makefile, then open Makefile with vim.
  3. Just remove -mavx in line of "CPUARCHOPT =" ( line 41 ).
  4. Write file and exit with ( wq command ) in vim.
  5. Just run a "make" in your shell.