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Code Issues 144 Wiki Activity

Lua script screens beside the WebAssembly ones

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Hirek
2026-11-10 15:29:25 +01:00
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#include "stdafx.h"
#include "doctest.h"
#include "scripting/scriptscreenkernels.h"
#include <array>
#include <span>
#include <vector>
// the image filters the script screens call through the host give the pixels of the Python screens: led_util's
// render_post() and Pillow's resize(..., Image.LANCZOS). the expected images were made by them (Pillow 12.2) from a
// 5x3 image of (x*53 + y*97, x*31 + y*17 + 100, x*7 + y*151 + 40) mod 256
namespace {
// RGB as Pillow gives it
constexpr std::array<std::uint8_t, 45> source{
0, 100, 40, 53, 131, 47, 106, 162, 54, 159, 193, 61, 212, 224, 68, 97, 117, 191, 150, 148, 198, 203, 179, 205,
0, 210, 212, 53, 241, 219, 194, 134, 86, 247, 165, 93, 44, 196, 100, 97, 227, 107, 150, 2, 114,
};
constexpr std::array<std::uint8_t, 288> posted{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 33, 144, 77, 28, 122, 65, 99, 194, 97,
84, 164, 82, 158, 236, 108, 134, 200, 91, 205, 255, 114, 174, 229, 96, 241, 255, 109, 204, 238, 92, 0, 0, 0,
0, 0, 0, 28, 122, 65, 23, 100, 53, 84, 164, 82, 69, 135, 67, 134, 200, 91, 110, 165, 75, 174, 229, 96,
143, 189, 79, 204, 238, 92, 168, 196, 76, 0, 0, 0, 0, 0, 0, 144, 173, 231, 122, 147, 196, 215, 229, 255,
182, 194, 219, 255, 255, 255, 219, 232, 230, 67, 255, 255, 56, 255, 235, 101, 255, 255, 85, 255, 225, 0, 0, 0,
0, 0, 0, 122, 147, 196, 100, 121, 161, 182, 194, 219, 150, 160, 180, 219, 232, 230, 180, 191, 189, 56, 255, 235,
46, 213, 193, 85, 255, 225, 70, 212, 185, 0, 0, 0, 0, 0, 0, 234, 178, 126, 198, 151, 107, 255, 231, 148,
251, 196, 125, 106, 255, 159, 90, 230, 135, 139, 255, 165, 118, 248, 140, 177, 65, 158, 150, 55, 134, 0, 0, 0,
0, 0, 0, 198, 151, 107, 163, 124, 88, 251, 196, 125, 207, 161, 103, 90, 230, 135, 74, 189, 111, 118, 248, 140,
97, 204, 115, 150, 55, 134, 123, 45, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
constexpr std::array<std::uint8_t, 561> enlarged{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 12, 46, 26, 22, 90, 53, 18, 71, 41, 50, 102, 55, 58, 108, 58, 53, 98, 52,
88, 131, 65, 87, 128, 62, 84, 119, 58, 114, 144, 69, 102, 139, 63, 106, 133, 60, 136, 144, 67, 139, 144, 68,
56, 71, 29, 0, 0, 0, 0, 0, 0, 16, 85, 39, 25, 165, 76, 21, 130, 59, 80, 188, 84, 94, 198, 89,
86, 178, 78, 155, 246, 102, 150, 236, 97, 151, 221, 89, 232, 255, 112, 210, 255, 100, 213, 250, 94, 255, 255, 108,
255, 255, 107, 113, 129, 44, 0, 0, 0, 0, 0, 0, 19, 67, 38, 31, 130, 74, 25, 100, 57, 72, 148, 78,
83, 155, 82, 75, 137, 72, 128, 191, 92, 124, 181, 87, 119, 172, 81, 167, 225, 99, 146, 202, 89, 151, 197, 85,
200, 238, 97, 198, 235, 95, 79, 96, 39, 0, 0, 0, 0, 0, 0, 70, 90, 108, 135, 177, 217, 108, 140, 171,
172, 198, 208, 188, 211, 215, 167, 186, 192, 218, 235, 219, 227, 238, 214, 175, 222, 204, 95, 245, 222, 62, 245, 213,
89, 240, 209, 122, 244, 224, 123, 243, 224, 49, 124, 99, 0, 0, 0, 0, 0, 0, 74, 89, 130, 139, 174, 255,
110, 136, 201, 182, 194, 246, 197, 205, 253, 170, 182, 223, 244, 239, 255, 255, 234, 252, 186, 218, 236, 52, 255, 255,
15, 245, 249, 49, 244, 240, 72, 255, 255, 73, 255, 255, 29, 130, 113, 0, 0, 0, 0, 0, 0, 76, 82, 96,
147, 160, 188, 114, 123, 145, 166, 177, 183, 181, 187, 188, 163, 165, 163, 186, 224, 205, 188, 214, 191, 140, 200, 176,
80, 251, 215, 54, 228, 190, 75, 211, 179, 105, 219, 206, 106, 217, 204, 42, 87, 82, 0, 0, 0, 0, 0, 0,
124, 96, 69, 250, 189, 137, 195, 149, 108, 225, 207, 138, 250, 221, 143, 237, 195, 127, 134, 244, 156, 80, 245, 148,
103, 228, 139, 135, 248, 165, 120, 252, 150, 129, 193, 143, 175, 68, 160, 178, 59, 161, 72, 34, 66, 0, 0, 0,
0, 0, 0, 135, 101, 67, 255, 197, 133, 206, 153, 103, 255, 216, 134, 255, 228, 139, 247, 200, 122, 127, 255, 152,
67, 255, 144, 98, 237, 134, 147, 255, 162, 131, 255, 146, 138, 187, 138, 189, 48, 157, 190, 37, 156, 76, 26, 64,
0, 0, 0, 0, 0, 0, 57, 44, 32, 110, 85, 64, 84, 65, 48, 121, 94, 63, 140, 98, 65, 102, 86, 57,
60, 120, 72, 39, 112, 68, 46, 103, 62, 61, 134, 76, 52, 133, 68, 56, 82, 64, 78, 34, 74, 77, 29, 73,
31, 16, 29, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0,
};
constexpr std::array<std::uint8_t, 105> reduced{
2, 22, 10, 14, 58, 25, 35, 70, 30, 53, 83, 33, 74, 90, 34, 95, 99, 36, 37, 40, 13, 17, 60, 41,
63, 155, 101, 115, 186, 110, 157, 217, 117, 161, 234, 120, 207, 255, 127, 81, 103, 47, 52, 64, 91, 142, 165, 218,
186, 193, 220, 217, 219, 227, 58, 229, 227, 70, 251, 241, 32, 101, 90, 92, 72, 57, 230, 184, 137, 233, 214, 144,
110, 238, 155, 114, 255, 157, 158, 131, 166, 64, 23, 60, 32, 24, 16, 84, 60, 38, 82, 70, 41, 27, 79, 44,
40, 90, 45, 56, 29, 47, 22, 2, 17,
};
constexpr std::array<std::uint8_t, 288> plain{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 100, 40, 0, 85, 34, 53, 131, 47,
45, 111, 39, 106, 162, 54, 90, 137, 45, 159, 193, 61, 135, 164, 51, 212, 224, 68, 180, 190, 57, 0, 0, 0,
0, 0, 0, 0, 85, 34, 0, 70, 28, 45, 111, 39, 37, 91, 32, 90, 137, 45, 74, 113, 37, 135, 164, 51,
111, 135, 42, 180, 190, 57, 148, 156, 47, 0, 0, 0, 0, 0, 0, 97, 117, 191, 82, 99, 162, 150, 148, 198,
127, 125, 168, 203, 179, 205, 172, 152, 174, 0, 210, 212, 0, 178, 180, 53, 241, 219, 45, 204, 186, 0, 0, 0,
0, 0, 0, 82, 99, 162, 67, 81, 133, 127, 125, 168, 105, 103, 138, 172, 152, 174, 142, 125, 143, 0, 178, 180,
0, 147, 148, 45, 204, 186, 37, 168, 153, 0, 0, 0, 0, 0, 0, 194, 134, 86, 164, 113, 73, 247, 165, 93,
209, 140, 79, 44, 196, 100, 37, 166, 85, 97, 227, 107, 82, 192, 90, 150, 2, 114, 127, 1, 96, 0, 0, 0,
0, 0, 0, 164, 113, 73, 135, 93, 60, 209, 140, 79, 172, 115, 65, 37, 166, 85, 30, 137, 70, 82, 192, 90,
67, 158, 74, 127, 1, 96, 105, 1, 79, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
std::vector<std::uint8_t> rgba(std::span<std::uint8_t const> const Rgb) {
std::vector<std::uint8_t> result;
for (std::size_t idx = 0; idx < Rgb.size(); idx += 3) {
result.insert(result.end(), {Rgb[idx], Rgb[idx + 1], Rgb[idx + 2], 255});
}
return result;
}
} // namespace
TEST_CASE("script screen kernels: led_post gives the pixels of led_util.render_post") {
auto const input{rgba(source)};
std::vector<std::uint8_t> output(script_screens::image_size(12, 8), 7);
REQUIRE(script_screens::led_post(input, 5, 3, output, true));
CHECK(output == rgba(posted));
REQUIRE(script_screens::led_post(input, 5, 3, output, false));
CHECK(output == rgba(plain));
}
TEST_CASE("script screen kernels: resize_lanczos gives the pixels of Pillow's resize with LANCZOS") {
auto const input{rgba(posted)};
std::vector<std::uint8_t> larger(script_screens::image_size(17, 11));
REQUIRE(script_screens::resize_lanczos(input, 12, 8, larger, 17, 11));
CHECK(larger == rgba(enlarged));
std::vector<std::uint8_t> smaller(script_screens::image_size(7, 5));
REQUIRE(script_screens::resize_lanczos(input, 12, 8, smaller, 7, 5));
CHECK(smaller == rgba(reduced));
}
TEST_CASE("script screen kernels: images that don't fit their buffers are refused") {
std::vector<std::uint8_t> const input(script_screens::image_size(5, 3));
std::vector<std::uint8_t> output(script_screens::image_size(12, 8) - 1);
CHECK_FALSE(script_screens::led_post(input, 5, 3, output, true));
CHECK_FALSE(script_screens::led_post(input, 0, 3, output, true));
CHECK_FALSE(script_screens::resize_lanczos(input, 5, 3, output, 12, 8));
CHECK_FALSE(script_screens::resize_lanczos(input, 6, 3, output, 2, 2));
}