src/cmake_config.h
src/cmake_config_githash.h
src/unittest/test_world/world.mt
+games/devtest/mods/testnodes/textures/testnodes_generated_*.png
/locale/
.directory
*.cbp
end
return true
end
+
+
+-- PNG encoder safety wrapper
+
+local o_encode_png = core.encode_png
+function core.encode_png(width, height, data, compression)
+ if type(width) ~= "number" then
+ error("Incorrect type for 'width', expected number, got " .. type(width))
+ end
+ if type(height) ~= "number" then
+ error("Incorrect type for 'height', expected number, got " .. type(height))
+ end
+
+ local expected_byte_count = width * height * 4;
+
+ if type(data) ~= "table" and type(data) ~= "string" then
+ error("Incorrect type for 'height', expected table or string, got " .. type(height));
+ end
+
+ local data_length = type(data) == "table" and #data * 4 or string.len(data);
+
+ if data_length ~= expected_byte_count then
+ error(string.format(
+ "Incorrect length of 'data', width and height imply %d bytes but %d were provided",
+ expected_byte_count,
+ data_length
+ ))
+ end
+
+ if type(data) == "table" then
+ local dataBuf = {}
+ for i = 1, #data do
+ dataBuf[i] = core.colorspec_to_bytes(data[i])
+ end
+ data = table.concat(dataBuf)
+ end
+
+ return o_encode_png(width, height, data, compression or 6)
+end
* `minetest.colorspec_to_colorstring(colorspec)`: Converts a ColorSpec to a
ColorString. If the ColorSpec is invalid, returns `nil`.
* `colorspec`: The ColorSpec to convert
+* `minetest.colorspec_to_bytes(colorspec)`: Converts a ColorSpec to a raw
+ string of four bytes in an RGBA layout, returned as a string.
+ * `colorspec`: The ColorSpec to convert
+* `minetest.encode_png(width, height, data, [compression])`: Encode a PNG
+ image and return it in string form.
+ * `width`: Width of the image
+ * `height`: Height of the image
+ * `data`: Image data, one of:
+ * array table of ColorSpec, length must be width*height
+ * string with raw RGBA pixels, length must be width*height*4
+ * `compression`: Optional zlib compression level, number in range 0 to 9.
+ The data is one-dimensional, starting in the upper left corner of the image
+ and laid out in scanlines going from left to right, then top to bottom.
+ Please note that it's not safe to use string.char to generate raw data,
+ use `colorspec_to_bytes` to generate raw RGBA values in a predictable way.
+ The resulting PNG image is always 32-bit. Palettes are not supported at the moment.
+ You may use this to procedurally generate textures during server init.
Logging
-------
leveled_max = 127,
-- Maximum value for `leveled` (0-127), enforced in
-- `minetest.set_node_level` and `minetest.add_node_level`.
- -- Values above 124 might causes collision detection issues.
+ -- Values above 124 might causes collision detection issues.
liquid_range = 8,
-- Maximum distance that flowing liquid nodes can spread around
})
end
+-- Generate PNG textures
+
+local function mandelbrot(w, h, iterations)
+ local r = {}
+ for y=0, h-1 do
+ for x=0, w-1 do
+ local re = (x - w/2) * 4/w
+ local im = (y - h/2) * 4/h
+ -- zoom in on a nice view
+ re = re / 128 - 0.23
+ im = im / 128 - 0.82
+
+ local px, py = 0, 0
+ local i = 0
+ while px*px + py*py <= 4 and i < iterations do
+ px, py = px*px - py*py + re, 2 * px * py + im
+ i = i + 1
+ end
+ r[w*y+x+1] = i / iterations
+ end
+ end
+ return r
+end
+
+local function gen_checkers(w, h, tile)
+ local r = {}
+ for y=0, h-1 do
+ for x=0, w-1 do
+ local hori = math.floor(x / tile) % 2 == 0
+ local vert = math.floor(y / tile) % 2 == 0
+ r[w*y+x+1] = hori ~= vert and 1 or 0
+ end
+ end
+ return r
+end
+
+local fractal = mandelbrot(512, 512, 128)
+local checker = gen_checkers(512, 512, 32)
+
+local floor = math.floor
+local abs = math.abs
+local data_mb = {}
+local data_ck = {}
+for i=1, #fractal do
+ data_mb[i] = {
+ r = floor(fractal[i] * 255),
+ g = floor(abs(fractal[i] * 2 - 1) * 255),
+ b = floor(abs(1 - fractal[i]) * 255),
+ a = 255,
+ }
+ data_ck[i] = checker[i] > 0 and "#F80" or "#000"
+end
+
+local textures_path = minetest.get_modpath( minetest.get_current_modname() ) .. "/textures/"
+minetest.safe_file_write(
+ textures_path .. "testnodes_generated_mb.png",
+ minetest.encode_png(512,512,data_mb)
+)
+minetest.safe_file_write(
+ textures_path .. "testnodes_generated_ck.png",
+ minetest.encode_png(512,512,data_ck)
+)
+
+minetest.register_node("testnodes:generated_png_mb", {
+ description = S("Generated Mandelbrot PNG Test Node"),
+ tiles = { "testnodes_generated_mb.png" },
+
+ groups = { dig_immediate = 2 },
+})
+minetest.register_node("testnodes:generated_png_ck", {
+ description = S("Generated Checker PNG Test Node"),
+ tiles = { "testnodes_generated_ck.png" },
+
+ groups = { dig_immediate = 2 },
+})
#include "version.h"
#include "util/hex.h"
#include "util/sha1.h"
+#include "util/png.h"
#include <algorithm>
#include <cstdio>
return 0;
}
+// colorspec_to_bytes(colorspec)
+int ModApiUtil::l_colorspec_to_bytes(lua_State *L)
+{
+ NO_MAP_LOCK_REQUIRED;
+
+ video::SColor color(0);
+ if (read_color(L, 1, &color)) {
+ u8 colorbytes[4] = {
+ (u8) color.getRed(),
+ (u8) color.getGreen(),
+ (u8) color.getBlue(),
+ (u8) color.getAlpha(),
+ };
+ lua_pushlstring(L, (const char*) colorbytes, 4);
+ return 1;
+ }
+
+ return 0;
+}
+
+// encode_png(w, h, data, level)
+int ModApiUtil::l_encode_png(lua_State *L)
+{
+ NO_MAP_LOCK_REQUIRED;
+
+ // The args are already pre-validated on the lua side.
+ u32 width = readParam<int>(L, 1);
+ u32 height = readParam<int>(L, 2);
+ const char *data = luaL_checklstring(L, 3, NULL);
+ s32 compression = readParam<int>(L, 4);
+
+ std::string out = encodePNG((const u8*)data, width, height, compression);
+
+ lua_pushlstring(L, out.data(), out.size());
+ return 1;
+}
+
void ModApiUtil::Initialize(lua_State *L, int top)
{
API_FCT(log);
API_FCT(get_version);
API_FCT(sha1);
API_FCT(colorspec_to_colorstring);
+ API_FCT(colorspec_to_bytes);
+
+ API_FCT(encode_png);
LuaSettings::create(L, g_settings, g_settings_path);
lua_setfield(L, top, "settings");
API_FCT(get_version);
API_FCT(sha1);
API_FCT(colorspec_to_colorstring);
+ API_FCT(colorspec_to_bytes);
}
void ModApiUtil::InitializeAsync(lua_State *L, int top)
API_FCT(get_version);
API_FCT(sha1);
API_FCT(colorspec_to_colorstring);
+ API_FCT(colorspec_to_bytes);
LuaSettings::create(L, g_settings, g_settings_path);
lua_setfield(L, top, "settings");
// colorspec_to_colorstring(colorspec)
static int l_colorspec_to_colorstring(lua_State *L);
+ // colorspec_to_bytes(colorspec)
+ static int l_colorspec_to_bytes(lua_State *L);
+
+ // encode_png(w, h, data, level)
+ static int l_encode_png(lua_State *L);
+
public:
static void Initialize(lua_State *L, int top);
static void InitializeAsync(lua_State *L, int top);
${CMAKE_CURRENT_SOURCE_DIR}/string.cpp
${CMAKE_CURRENT_SOURCE_DIR}/srp.cpp
${CMAKE_CURRENT_SOURCE_DIR}/timetaker.cpp
+ ${CMAKE_CURRENT_SOURCE_DIR}/png.cpp
PARENT_SCOPE)
--- /dev/null
+/*
+Minetest
+Copyright (C) 2021 hecks
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "png.h"
+#include <string>
+#include <sstream>
+#include <zlib.h>
+#include <cassert>
+#include "util/serialize.h"
+#include "serialization.h"
+#include "irrlichttypes.h"
+
+static void writeChunk(std::ostringstream &target, const std::string &chunk_str)
+{
+ assert(chunk_str.size() >= 4);
+ assert(chunk_str.size() - 4 < U32_MAX);
+ writeU32(target, chunk_str.size() - 4); // Write length minus the identifier
+ target << chunk_str;
+ writeU32(target, crc32(0,(const u8*)chunk_str.data(), chunk_str.size()));
+}
+
+std::string encodePNG(const u8 *data, u32 width, u32 height, s32 compression)
+{
+ auto file = std::ostringstream(std::ios::binary);
+ file << "\x89PNG\r\n\x1a\n";
+
+ {
+ auto IHDR = std::ostringstream(std::ios::binary);
+ IHDR << "IHDR";
+ writeU32(IHDR, width);
+ writeU32(IHDR, height);
+ // 8 bpp, color type 6 (RGBA)
+ IHDR.write("\x08\x06\x00\x00\x00", 5);
+ writeChunk(file, IHDR.str());
+ }
+
+ {
+ auto IDAT = std::ostringstream(std::ios::binary);
+ IDAT << "IDAT";
+ auto scanlines = std::ostringstream(std::ios::binary);
+ for(u32 i = 0; i < height; i++) {
+ scanlines.write("\x00", 1); // Null predictor
+ scanlines.write((const char*) data + width * 4 * i, width * 4);
+ }
+ compressZlib(scanlines.str(), IDAT, compression);
+ writeChunk(file, IDAT.str());
+ }
+
+ file.write("\x00\x00\x00\x00IEND\xae\x42\x60\x82", 12);
+
+ return file.str();
+}
--- /dev/null
+/*
+Minetest
+Copyright (C) 2021 hecks
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#pragma once
+
+#include <string>
+#include "irrlichttypes.h"
+
+/* Simple PNG encoder. Encodes an RGBA image with no predictors.
+ Returns a binary string. */
+std::string encodePNG(const u8 *data, u32 width, u32 height, s32 compression);
projects / dragonfireclient.git / commitdiff