SameBoy/QuickLook/get_image_for_rom.c

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#include <stdio.h>
#include <stdbool.h>
#include <unistd.h>
#include <assert.h>
#include "get_image_for_rom.h"
#include "gb.h"
#define LENGTH 60 * 10
struct local_data {
unsigned long frames;
bool running;
cancel_callback_t cancel_callback;
void *callback_data;
};
static char *async_input_callback(GB_gameboy_t *gb)
{
return NULL;
}
static void log_callback(GB_gameboy_t *gb, const char *string, GB_log_attributes attributes)
{
}
static void vblank(GB_gameboy_t *gb)
{
struct local_data *local_data = (struct local_data *)gb->user_data;
if (local_data->cancel_callback(local_data->callback_data)) {
local_data->running = false;
return;
}
if (local_data->frames == LENGTH) {
local_data->running = false;
}
else if (local_data->frames == LENGTH - 1) {
gb->disable_rendering = false;
}
local_data->frames++;
}
static uint32_t rgb_encode(GB_gameboy_t *gb, uint8_t r, uint8_t g, uint8_t b)
{
return (b << 16) | (g << 8) | (r) | 0xFF000000;
}
int get_image_for_rom(const char *filename, const char *boot_path, uint32_t *output, uint8_t *cgb_flag,
cancel_callback_t cancel_callback, void *callback_data)
{
GB_gameboy_t gb;
GB_init_cgb(&gb);
if (GB_load_boot_rom(&gb, boot_path)) {
GB_free(&gb);
return 1;
}
GB_set_vblank_callback(&gb, (GB_vblank_callback_t) vblank);
GB_set_pixels_output(&gb, output);
GB_set_rgb_encode_callback(&gb, rgb_encode);
GB_set_async_input_callback(&gb, async_input_callback);
GB_set_log_callback(&gb, log_callback);
if (GB_load_rom(&gb, filename)) {
GB_free(&gb);
return 1;
}
/* Run emulation */
struct local_data local_data = {0,};
gb.user_data = &local_data;
local_data.running = true;
local_data.frames = 0;
local_data.cancel_callback = cancel_callback;
local_data.callback_data = callback_data;
gb.turbo = gb.turbo_dont_skip = gb.disable_rendering = true;
while (local_data.running) {
GB_run(&gb);
}
*cgb_flag = gb.rom[0x143] & 0xC0;
GB_free(&gb);
/* Report failure if cancelled */
return local_data.frames != LENGTH + 1;
}