Start adding screenshot support.

Makefile

@@ -2,7 +2,7 @@ include config.mk
 
 TARGET = ssnes tools/ssnes-joyconfig
 
-OBJ = ssnes.o file.o driver.o settings.o dynamic.o message.o rewind.o movie.o autosave.o gfx/gfx_common.o ups.o strl.o
+OBJ = ssnes.o file.o driver.o settings.o dynamic.o message.o rewind.o movie.o autosave.o gfx/gfx_common.o ups.o strl.o screenshot.o
 JOYCONFIG_OBJ = tools/ssnes-joyconfig.o conf/config_file.o
 HEADERS = $(wildcard */*.h) $(wildcard *.h)
 

Makefile.win32

@@ -1,6 +1,6 @@
 TARGET = ssnes.exe
 JTARGET = ssnes-joyconfig.exe
-OBJ = ssnes.o file.o driver.o conf/config_file.o settings.o dynamic.o message.o rewind.o movie.o autosave.o gfx/gfx_common.o ups.o strl.o
+OBJ = ssnes.o file.o driver.o conf/config_file.o settings.o dynamic.o message.o rewind.o movie.o autosave.o gfx/gfx_common.o ups.o strl.o screenshot.o
 JOBJ = conf/config_file.o tools/main-stub.o tools/ssnes-joyconfig.o
 
 CC = gcc

Makefile.win64

@@ -1,6 +1,6 @@
 TARGET = ssnes.exe
 JTARGET = ssnes-joyconfig.exe
-OBJ = ssnes.o file.o driver.o conf/config_file.o settings.o dynamic.o message.o rewind.o movie.o autosave.o gfx/gfx_common.o ups.o strl.o
+OBJ = ssnes.o file.o driver.o conf/config_file.o settings.o dynamic.o message.o rewind.o movie.o autosave.o gfx/gfx_common.o ups.o strl.o screenshot.o
 JOBJ = conf/config_file.o tools/main-stub.o tools/ssnes-joyconfig.o
 
 CC = gcc

screenshot.c

@@ -0,0 +1,110 @@
+/*  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));
+
+   for (int j = height - 1; j >= 0; j--)
+   {
+      uint8_t * restrict dst = line;
+      const uint16_t * restrict src = frame + j * pitch;
+      for (unsigned i = 0; i < width; i++)
+      {
+         uint16_t pixel = *src++;
+         uint8_t b = (pixel & 0x1f) << 3;
+         uint8_t g = (pixel & 0x03e0) >> 2;
+         uint8_t r = (pixel & 0x7c00) >> 7;
+         *dst++ = b;
+         *dst++ = g;
+         *dst++ = r;
+      }
+
+      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);
+
+   char timefmt[64];
+   strftime(timefmt, sizeof(timefmt), "SSNES-%c", localtime(&cur_time));
+
+   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;
+}

screenshot.h

@@ -0,0 +1,27 @@
+/*  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/>.
+ */
+
+#ifndef __SSNES_SCREENSHOT_H
+#define __SSNES_SCREENSHOT_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+bool screenshot_dump(const char *folder, const uint16_t *frame, 
+      unsigned width, unsigned height, unsigned pitch);
+
+#endif