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screenshot.cpp
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screenshot.cpp
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/*****************************************************************************\
Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
This file is licensed under the Snes9x License.
For further information, consult the LICENSE file in the root directory.
\*****************************************************************************/
#ifdef HAVE_LIBPNG
#include <png.h>
#endif
#include <ctime>
#include <sstream>
#include <iomanip>
#include "snes9x.h"
#include "memmap.h"
#include "screenshot.h"
bool8 S9xDoScreenshot (int width, int height)
{
Settings.TakeScreenshot = FALSE;
#ifdef HAVE_LIBPNG
FILE *fp;
png_structp png_ptr;
png_infop info_ptr;
png_color_8 sig_bit;
int imgwidth, imgheight;
std::tm *current_time;
std::time_t current_timet = time(nullptr);
current_time = localtime(¤t_timet);
auto screenshot_dir = S9xGetDirectory(SCREENSHOT_DIR);
std::stringstream ss;
ss << screenshot_dir
<< S9xBasenameNoExt(Memory.ROMFilename) << "-"
<< std::put_time(current_time, "%Y-%m-%d-%H-%M-%S");
std::string fname = ss.str() ".png";
for (int i = 0; i < 1000; i )
{
FILE *fp = fopen(fname.c_str(), "r");
if (!fp)
break;
fclose(fp);
fname = ss.str() "-" std::to_string(i) ".png";
}
fp = fopen(fname.c_str(), "wb");
if (!fp)
{
S9xMessage(S9X_ERROR, 0, "Failed to take screenshot.");
return (FALSE);
}
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr)
{
fclose(fp);
remove(fname.c_str());
S9xMessage(S9X_ERROR, 0, "Failed to take screenshot.");
return (FALSE);
}
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
fclose(fp);
remove(fname.c_str());
S9xMessage(S9X_ERROR, 0, "Failed to take screenshot.");
return (FALSE);
}
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(fp);
remove(fname.c_str());
S9xMessage(S9X_ERROR, 0, "Failed to take screenshot.");
return (FALSE);
}
imgwidth = width;
imgheight = height;
if (Settings.StretchScreenshots == 1)
{
if (width > SNES_WIDTH && height <= SNES_HEIGHT_EXTENDED)
imgheight = height << 1;
}
else if (Settings.StretchScreenshots == 2)
{
if (width <= SNES_WIDTH)
imgwidth = width << 1;
if (height <= SNES_HEIGHT_EXTENDED)
imgheight = height << 1;
}
png_init_io(png_ptr, fp);
png_set_IHDR(png_ptr, info_ptr, imgwidth, imgheight, 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
sig_bit.red = 5;
sig_bit.green = 5;
sig_bit.blue = 5;
png_set_sBIT(png_ptr, info_ptr, &sig_bit);
png_set_shift(png_ptr, &sig_bit);
png_write_info(png_ptr, info_ptr);
png_set_packing(png_ptr);
png_byte *row_pointer = new png_byte[png_get_rowbytes(png_ptr, info_ptr)];
uint16 *screen = GFX.Screen;
for (int y = 0; y < height; y , screen = GFX.RealPPL)
{
png_byte *rowpix = row_pointer;
for (int x = 0; x < width; x )
{
uint32 r, g, b;
DECOMPOSE_PIXEL(screen[x], r, g, b);
*(rowpix ) = r;
*(rowpix ) = g;
*(rowpix ) = b;
if (imgwidth != width)
{
*(rowpix ) = r;
*(rowpix ) = g;
*(rowpix ) = b;
}
}
png_write_row(png_ptr, row_pointer);
if (imgheight != height)
png_write_row(png_ptr, row_pointer);
}
delete [] row_pointer;
png_write_end(png_ptr, info_ptr);
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(fp);
fprintf(stderr, "%s saved.\n", fname.c_str());
std::string base = "Saved screenshot " S9xBasename(fname);
S9xMessage(S9X_INFO, 0, base.c_str());
return (TRUE);
#else
fprintf(stderr, "Screenshot support not available (libpng was not found at build time).\n");
return (FALSE);
#endif
}