What the heck is this?

Just a collection of random, sometimes useful, code that I write.

FAQ

Do you accept pull requests?

Absolutely. Some of this stuff has undefined behaviour and bugs.

What's up with the name?

I used to have a library called "xiLib", but that seems like a poor name these days, so xilefianlib it is. Don't think too hard as to what "Xilefian" means.

What's in the box

C++20

bvec

An implementation of std::vector<bool> that provides something akin to small-string-optimisation.

btree

Unbalanced binary tree container.

bheap

Binary heap priority-queue.

Arm GBA

Mode 4 Column Unpack/Pack

Pixel buffer column pack/unpack utilities for Mode 4 video memory (240 pixels wide, 8 bits per pixel).

4x Columns

Packs/unpacks 4 columns of pixel data at a time.

#include <xilefian/m4column.h>

#define VIDEO4_VRAM (*(char*) 0x6000000)

int main() {
    char columnBuffer[160][4];
    xilefian_m4col_unpack4(columnBuffer, VIDEO4_VRAM + 4, 160); /* Read 4x160 pixels into columnBuffer, starting at column 4 */
    xilefian_m4col_pack4(VIDEO4_VRAM + 8, columnBuffer, 160); /* Write 4x160 pixels from columnBuffer, starting at column 8 */
}

Signature	Description
`void xilefian_m4col_pack4(void* dest, const void* src, size_t n)`	Packs n rows of 4 columns of pixels from src into dest Assumes n is non-zero and a multiple of 4
`void xilefian_m4col_unpack4(void* dest, const void* src, size_t n)`	Unpacks n rows of 4 columns of pixels from src into dest Assumes n is non-zero and a multiple of 4

2x Columns

Packs/unpacks 2 columns of pixel data at a time.

#include <xilefian/m4column.h>

#define VIDEO4_VRAM (*(char*) 0x6000000)

int main() {
    char columnBuffer[160][2];
    xilefian_m4col_unpack2(columnBuffer, VIDEO4_VRAM + 2, 160); /* Read 2x160 pixels into columnBuffer, starting at column 2 */
    xilefian_m4col_pack2(VIDEO4_VRAM + 4, columnBuffer, 160); /* Write 2x160 pixels from columnBuffer, starting at column 4 */
}

Signature	Description
`void xilefian_m4col_pack2(void* dest, const void* src, size_t n)`	Packs n rows of 2 columns of pixels from src into dest Assumes n is non-zero and a multiple of 4
`void xilefian_m4col_unpack2(void* dest, const void* src, size_t n)`	Unpacks n rows of 2 columns of pixels from src into dest Assumes n is non-zero and a multiple of 4

felixjones / xilefianlib