RetroArch/screenshot.c

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/* SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
* Copyright (C) 2010-2011 - Hans-Kristian Arntzen
*
* Some code herein may be based on code found in BSNES.
*
* SSNES is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* SSNES 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with SSNES.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include "screenshot.h"
#include "strl.h"
#include <stdio.h>
#include <time.h>
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include "general.h"
// Simple 24bpp .BMP writer.
static void write_header(FILE *file, unsigned width, unsigned height)
{
unsigned line_size = (width * 3 + 3) & ~3;
unsigned size = line_size * height + 54;
unsigned size_array = line_size * height;
// Generic BMP stuff.
const uint8_t header[] = {
'B', 'M',
(size >> 0) & 0xff, (size >> 8) & 0xff, (size >> 16) & 0xff, (size >> 24) & 0xff,
0, 0, 0, 0,
54, 0, 0, 0,
40, 0, 0, 0,
(width >> 0) & 0xff, (width >> 8) & 0xff, (width >> 16) & 0xff, (width >> 24) & 0xff,
(height >> 0) & 0xff, (height >> 8) & 0xff, (height >> 16) & 0xff, (height >> 24) & 0xff,
1, 0,
24, 0,
0, 0, 0, 0,
(size_array >> 0) & 0xff, (size_array >> 8) & 0xff, (size_array >> 16) & 0xff, (size_array >> 24) & 0xff,
19, 11, 0, 0,
19, 11, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0
};
fwrite(header, 1, sizeof(header), file);
}
static void dump_content(FILE *file, const uint16_t *frame, unsigned width, unsigned height, unsigned pitch)
{
pitch >>= 1;
unsigned line_size = (width * 3 + 3) & ~3;
uint8_t line[line_size];
memset(line, 0, sizeof(line));
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// BMP likes reverse ordering for some reason :v
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for (int j = height - 1; j >= 0; j--)
{
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uint8_t *dst = line;
const uint16_t *src = frame + j * pitch;
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for (unsigned i = 0; i < width; i++)
{
uint16_t pixel = *src++;
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uint8_t b = (pixel >> 0) & 0x1f;
uint8_t g = (pixel >> 5) & 0x1f;
uint8_t r = (pixel >> 10) & 0x1f;
*dst++ = (b << 3) | (b >> 2);
*dst++ = (g << 3) | (g >> 2);
*dst++ = (r << 3) | (r >> 2);
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}
fwrite(line, 1, sizeof(line), file);
}
}
bool screenshot_dump(const char *folder, const uint16_t *frame,
unsigned width, unsigned height, unsigned pitch)
{
time_t cur_time;
time(&cur_time);
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char timefmt[128];
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strftime(timefmt, sizeof(timefmt), "SSNES-%m%d-%H%M%S.bmp", localtime(&cur_time));
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char filename[256];
strlcpy(filename, folder, sizeof(filename));
strlcat(filename, "/", sizeof(filename));
strlcat(filename, timefmt, sizeof(filename));
FILE *file = fopen(filename, "wb");
if (!file)
{
SSNES_ERR("Failed to open file \"%s\" for screenshot.\n", filename);
return false;
}
write_header(file, width, height);
dump_content(file, frame, width, height, pitch);
fclose(file);
return true;
}