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/* This is free and unencumbered software released into the public domain.
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*
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* Anyone is free to copy, modify, publish, use, compile, sell, or
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* distribute this software, either in source code form or as a compiled
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* binary, for any purpose, commercial or non-commercial, and by any
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* means.
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*
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* In jurisdictions that recognize copyright laws, the author or authors
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* of this software dedicate any and all copyright interest in the
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* software to the public domain. We make this dedication for the benefit
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* of the public at large and to the detriment of our heirs and
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* successors. We intend this dedication to be an overt act of
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* relinquishment in perpetuity of all present and future rights to this
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* software under copyright law.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* For more information, please refer to <http://unlicense.org/>
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*/
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/* To build:
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* gcc bannerpng.c lodepng.c -o bannerpng
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* https://lodev.org/lodepng/
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*/
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#include "lodepng.h"
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#include <math.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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/**
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* @param input path to the DS ROM
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* @param output path to write to
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* @return true if successful
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*/
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bool bannergif(const char *input, const char *output) {
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FILE *rom = fopen(input, "rb");
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if(!rom)
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return false;
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// Seek to banner
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fseek(rom, 0x68, SEEK_SET);
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uint32_t bannerOfs;
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fread(&bannerOfs, sizeof(uint32_t), 1, rom);
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fseek(rom, bannerOfs, SEEK_SET);
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// Load banner data
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uint8_t palette[0x10][4]; // 16 colors RGBA
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uint8_t bitmap[32 * 32 * 4]; // 32×32 RGBA
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// Read palette
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fseek(rom, bannerOfs + 0x220, SEEK_SET);
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for(int i = 0; i < 0x10; i++) {
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uint16_t color;
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fread(&color, sizeof(uint16_t), 1, rom);
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palette[i][0] = lroundf((color & 0x1F) * 255.0f / 31.0f);
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palette[i][1] = lroundf(((color >> 5) & 0x1F) * 255.0f / 31.0f);
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palette[i][2] = lroundf(((color >> 10) & 0x1F) * 255.0f / 31.0f);
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palette[i][3] = i == 0 ? 0x00 : 0xFF;
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}
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// Read bitmap
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fseek(rom, bannerOfs + 0x20, SEEK_SET);
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for(int ty = 0; ty < 4; ty++) {
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for(int tx = 0; tx < 4; tx++) {
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for(int y = 0; y < 8; y++) {
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for(int x = 0; x < 4; x++) {
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uint8_t byte = fgetc(rom);
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memcpy(bitmap + ((ty * 8 + y) * 32 * 4) + (tx * 8 + x * 2) * 4, palette[byte & 0xF], 4);
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memcpy(bitmap + ((ty * 8 + y) * 32 * 4) + (tx * 8 + x * 2) * 4 + 4, palette[byte >> 4], 4);
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}
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}
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}
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}
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fclose(rom);
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lodepng_encode32_file(output, bitmap, 32, 32);
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return true;
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}
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int main(int argc, char **argv) {
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if(argc < 3) {
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printf("Usage: %s input.nds output.png\n", argv[0]);
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return 1;
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}
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bool success = bannergif(argv[1], argv[2]);
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return success ? 0 : 1;
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}
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