Pixel-Composer/scripts/buffer_functions/buffer_functions.gml

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function buffer_get_color(buffer, _x, _y, w, h) {
buffer_seek(buffer, buffer_seek_start, (w * _y + _x) * 4);
var c = buffer_read(buffer, buffer_u32);
return c;
}
function buffer_get_string(buffer, text = true) {
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buffer_seek(buffer, buffer_seek_start, 0);
var len = buffer_get_size(buffer);
var ss = "";
for (var i = 0; i < len; i++) {
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var _r = buffer_read(buffer, buffer_u8);
var _s = text? chr(_r) : dec_to_hex(_r, 2);
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ss += _s;
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if(!text && i % 2) ss += " ";
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}
return ss;
}
function buffer_from_string(str) {
var _b = buffer_create(string_length(str) * 1, buffer_fast, 1);
for( var i = 1; i <= string_length(str); i++ )
buffer_write(_b, buffer_u8, ord(string_char_at(str, i)));
return _b;
}
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function buffer_from_surface(surface, size = true) {
static header_length = 24;
if(!is_surface(surface)) return noone;
var bitSize = surface_format_get_bytes(surface_get_format(surface));
var _b = buffer_create((header_length * size) + surface_get_width(surface) * surface_get_height(surface) * bitSize, buffer_fixed, 1);
if(size) {
buffer_write(_b, buffer_text, "PXCS");
buffer_write(_b, buffer_u16, surface_get_width(surface));
buffer_write(_b, buffer_u16, surface_get_height(surface));
buffer_write(_b, buffer_u8, surface_get_format(surface));
}
buffer_get_surface(_b, surface, header_length * size);
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return _b;
}
function buffer_from_file(path) {
if(!file_exists(path)) return;
var _b = buffer_load(path);
return _b;
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}
function buffer_read_at(buffer, position, type) {
buffer_seek(buffer, buffer_seek_start, position);
return buffer_read(buffer, type);
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}