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#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include "common.h"
#include "embed.h"
#include "get_image_for_rom.h"
#include "image.h"
static uint32_t alpha_blend(const uint32_t dest, const uint32_t src)
{
uint8_t r1 = (src >> 0) & 0xFF;
uint8_t g1 = (src >> 8) & 0xFF;
uint8_t b1 = (src >> 16) & 0xFF;
double a1 = (double)((src >> 24) & 0xFF) / 255.0;
uint8_t r2 = (dest >> 0) & 0xFF;
uint8_t g2 = (dest >> 8) & 0xFF;
uint8_t b2 = (dest >> 16) & 0xFF;
double a2 = (double)((dest >> 24) & 0xFF) / 255.0;
uint8_t a = (a1 + (1.0 - a1) * a2) * 255.0;
if (a > 0) {
uint8_t r = (255 / a) * ((a1 * r1) + (1 - a1) * r2);
uint8_t g = (255 / a) * ((a1 * g1) + (1 - a1) * g2);
uint8_t b = (255 / a) * ((a1 * b1) + (1 - a1) * b2);
return (a << 24) | (b << 16) | (g << 8) | r;
}
return 0;
}
static uint32_t average(const uint32_t dest, const uint32_t src)
{
uint8_t r1 = (src >> 0) & 0xFF;
uint8_t g1 = (src >> 8) & 0xFF;
uint8_t b1 = (src >> 16) & 0xFF;
uint8_t a1 = (src >> 24) & 0xFF;
uint8_t r2 = (dest >> 0) & 0xFF;
uint8_t g2 = (dest >> 8) & 0xFF;
uint8_t b2 = (dest >> 16) & 0xFF;
uint8_t a2 = (dest >> 24) & 0xFF;
if (a2 > 0) {
uint8_t r = (r1 + r2) / 2;
uint8_t g = (g1 + g2) / 2;
uint8_t b = (b1 + b2) / 2;
uint8_t a = (a1 + a2) / 2;
return (a << 24) | (b << 16) | (g << 8) | r;
}
return src;
}
static void scale_image(const uint32_t* input, const signed input_width, const signed input_height,
uint32_t* output, const double multiplier, const signed samples)
{
signed output_width = input_width * multiplier;
uint32_t pixel;
for (signed h = 0; h < input_height * multiplier; ++h) {
for (signed w = 0; w < input_width * multiplier; ++w) {
pixel = 0;
signed h_input = h/multiplier;
signed w_input = w/multiplier;
signed h_input_max = (h+1)/multiplier-1;
signed w_input_max = (w+1)/multiplier-1;
signed h_step = h_input_max - h_input + 2;
signed w_step = w_input_max - w_input + 2;
for (signed xa = w_input; xa < w_input_max + 2 && xa < input_width; xa += w_step / samples)
for (signed ya = h_input; ya < h_input_max + 2 && ya < input_width; ya += h_step / samples)
pixel = average(pixel, input[(signed)xa + ((signed)ya * input_width)]);
output[w + (h * output_width)] = pixel;
}
}
}
int main (int argc , char** argv)
{
const uint8_t BITMAP_WIDTH = 160;
const uint8_t BITMAP_HEIGHT = 144;
const uint8_t SCALE_MULTIPLIER = 4;
const uint16_t UPSCALED_WIDTH = BITMAP_WIDTH * SCALE_MULTIPLIER;
const uint16_t UPSCALED_HEIGHT = BITMAP_HEIGHT * SCALE_MULTIPLIER;
const uint16_t X_OFFSET = 192;
const uint16_t Y_OFFSET = 298;
int size = 256;
char* input = NULL;
char* output = NULL;
const uint8_t* bootrom = cgb_boot_bin;
const size_t bootrom_size = cgb_boot_bin_size;
char* bootrom_path = NULL;
for (int i = 1; i < argc; ++i) {
if (argc > i + 1) {
if (strcmp(argv[i], "--size") == 0) {
size = atoi(argv[++i]);
if (size < 0) {
fprintf(stderr, "Size cannot be smaller than 0\n");
return -1;
}
fprintf(stderr, "Setting size to %i\n", size);
continue;
}
if (strcmp(argv[i], "--duration") == 0) {
unsigned int arg_dur = atoi(argv[++i]);
if (arg_dur < 1) {
fprintf(stderr, "Duration cannot be smaller than 1\n");
return -1;
}
fprintf(stderr, "Setting duration to %i seconds\n", arg_dur);
duration = arg_dur * 60;
continue;
}
if (strcmp(argv[i], "--boot") == 0) {
bootrom_path = argv[++i];
fprintf(stderr, "Using boot ROM %s\n", bootrom_path);
continue;
}
}
if (!input) {
input = argv[i];
continue;
}
if (!output) {
output = argv[i];
continue;
}
}
if (!input || !output)
{
fprintf(stderr,
"Usage: %s input output [options]\n"
"\n"
"Options:\n"
"\t--size [%i]\t\tset the size of the emulated screen\n"
"\t--duration [%i]\tset duration of emulation in seconds\n"
"\t--boot [path]\tspecify an external bootrom\n",
argv[0], size, duration/10);
return 0;
}
uint32_t bitmap[BITMAP_WIDTH*BITMAP_HEIGHT];
uint8_t cgbFlag = 0;
if (bootrom_path ? get_image_for_rom(input, bootrom_path, bitmap, &cgbFlag)
: get_image_for_rom_alt(input, bootrom, bootrom_size, bitmap, &cgbFlag)) {
return -1;
}
unsigned template_width, template_height;
uint32_t* template;
unsigned char* template_data;
size_t template_size;
switch (cgbFlag) {
case 0xC0:
template_data = ColorCartridgeTemplate_png;
template_size = ColorCartridgeTemplate_png_size;
break;
case 0x80:
template_data = UniversalCartridgeTemplate_png;
template_size = UniversalCartridgeTemplate_png_size;
break;
default:
template_data = CartridgeTemplate_png;
template_size = CartridgeTemplate_png_size;
}
if (decode32(&template, &template_width, &template_height, template_data, template_size)) {
fprintf(stderr, "Failed to decode template\n");
return -1;
}
uint32_t* canvas = local_malloc(template_width * template_height * sizeof(uint32_t));
// clear the canvas so we don't end up with garbage data somewhere
memset(canvas, 0, template_width * template_height * sizeof(uint32_t));
uint32_t* screen = local_malloc(UPSCALED_WIDTH * UPSCALED_HEIGHT * sizeof(uint32_t));
scale_image(bitmap, BITMAP_WIDTH, BITMAP_HEIGHT, screen, SCALE_MULTIPLIER, 1);
for (signed y = 0; y < UPSCALED_HEIGHT; y++) {
for (signed x = 0; x < UPSCALED_WIDTH; x++) {
canvas[x + X_OFFSET + ((y + Y_OFFSET) * template_height)] = screen[x + (y * UPSCALED_WIDTH)];
}
}
free(screen);
for (signed y = 0; y < template_height; y++) {
for (signed x = 0; x < template_width; x++) {
canvas[x + (y * template_width)] = alpha_blend(
canvas[x + (y * template_width)],
template[x + (y * template_width)]
);
}
}
uint32_t* final = local_malloc(size * size * sizeof(uint32_t));
scale_image(canvas, template_width, template_height, final, (double)size/template_width, template_width/size);
encode32_file(output, final, size, size);
free(final);
free(canvas);
free(template);
}
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