Alpha Value in Hex Color Picker

sugargenix · July 20, 2024, 8:20pm

I’m not sure if there is a setting I’m missing but I was wondering if it is possible to change the alpha values in the hex color picker with the string.

alpha_hex_color

The desired behavior is that a string like (#) a0a0a0a0 creates a color with all RGBA values 160.

Or that (#) a0a0a0ff creates a RGBA value of

desired values

red: 160
green: 160
blue: 160
alpha: 255

current behavior

red: 160
green: 160
blue: 255
alpha: 255

Currently using Aseprite v1.3.2 on MacOS 14.5.

behreandtjeremy · August 13, 2024, 9:43pm

I think you’d have to change the C++ source code to do this:

github.com

aseprite/aseprite/blob/main/src/app/ui/hex_color_entry.cpp#L67


      
          }
          
          void HexColorEntry::setColor(const app::Color& color)
          {
            m_entry.setTextf("%02x%02x%02x",
                             color.getRed(),
                             color.getGreen(),
                             color.getBlue());
          }
          
          void HexColorEntry::onEntryChange()
          {
            std::string text = m_entry.text();
            int r, g, b;
          
            // Remove non hex digits
            while (text.size() > 0 && !base::is_hex_digit(text[0]))
              text.erase(0, 1);
          
            // Fill with zeros at the end of the text
            while (text.size() < 6)

For anyone interested, the really important thing I found in my tinkering was to use strtoul to get an unsigned long, not strtol.

I was looking at this because it’d also be possible to support parsing RGB565 (a 4 digit hex code) and RGB444 (a 3 digit hex code) if you had different clauses based on the string’s length instead of always padding it out to 6.