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48 lines
1.7 KiB
48 lines
1.7 KiB
10 years ago
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How to generate image header file
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=================================
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(intended for Linux - dunno how it works in Windoze)
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1. Draw image in Gimp, with height a multiple of 8 (8, 16, 32... - how many
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LEDs you have)
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2. Set collor mode to indexed (black & white) - and make sure WHITE is where
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you want your leds to light up, black where you want dark.
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3. Export as C header file (eg. snowflake.h)
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Now use the getbytes.py script to transform it:
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$ python3 getbytes.py snowflake.h
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#define ROWS 2
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#define COLS 15
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const uint8_t image[COLS][ROWS] PROGMEM = {
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{ 0b00000001, 0b11000000 }, // ███
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{ 0b00010000, 0b10000100 }, // █ █ █
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{ 0b00111000, 0b10001110 }, // ███ █ ███
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{ 0b00011101, 0b11001100 }, // ███ ███ ██
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{ 0b00001100, 0b10011000 }, // ██ █ ██
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{ 0b00000010, 0b10100000 }, // █ █ █
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{ 0b01001001, 0b11001001 }, // █ █ ███ █ █
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{ 0b11111111, 0b11111111 }, //████████████████
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{ 0b01001001, 0b11001001 }, // █ █ ███ █ █
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{ 0b00000010, 0b10100000 }, // █ █ █
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{ 0b00001100, 0b10010000 }, // ██ █ █
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{ 0b00011001, 0b11011100 }, // ██ ███ ███
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{ 0b00111000, 0b10001110 }, // ███ █ ███
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{ 0b00010000, 0b10000100 }, // █ █ █
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{ 0b00000001, 0b11000000 }, // ███
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};
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That will show you the transformed header file.
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To store it:
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$ python3 getbytes.py snowflake.h > ../image_snowflake.h
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Now, in your main.c file, just include it (remove the old image import).
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