1 files changed, 111 insertions, 0 deletions
diff --git a/src/resources/imagewriter.cpp b/src/resources/imagewriter.cpp
new file mode 100644
index 000000000..f3f4be2b4
--- /dev/null
+++ b/src/resources/imagewriter.cpp
@@ -0,0 +1,111 @@
+/*
+ *  The Mana Client
+ *  Copyright (C) 2004-2009  The Mana World Development Team
+ *  Copyright (C) 2009-2010  The Mana Developers
+ *
+ *  This file is part of The Mana Client.
+ *
+ *  This program 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 Foundation; either version 2 of the License, or
+ *  any later version.
+ *
+ *  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "resources/imagewriter.h"
+
+#include "log.h"
+
+#include <png.h>
+#include <SDL.h>
+#include <string>
+
+bool ImageWriter::writePNG(SDL_Surface *surface, const std::string &filename)
+{
+    // TODO Maybe someone can make this look nice?
+
+    png_structp png_ptr;
+    png_infop info_ptr;
+    png_bytep *row_pointers;
+    int colortype;
+
+    if (SDL_MUSTLOCK(surface))
+        SDL_LockSurface(surface);
+
+    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
+    if (!png_ptr)
+    {
+        logger->log1("Had trouble creating png_structp");
+        return false;
+    }
+
+    info_ptr = png_create_info_struct(png_ptr);
+    if (!info_ptr)
+    {
+        png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
+        logger->log1("Could not create png_info");
+        return false;
+    }
+
+    if (setjmp(png_jmpbuf(png_ptr)))
+    {
+        png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
+        logger->log("problem writing to %s", filename.c_str());
+        return false;
+    }
+
+    FILE *fp = fopen(filename.c_str(), "wb");
+    if (!fp)
+    {
+        logger->log("could not open file %s for writing", filename.c_str());
+        return false;
+    }
+
+    png_init_io(png_ptr, fp);
+
+    colortype = (surface->format->BitsPerPixel == 24) ?
+        PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA;
+
+    png_set_IHDR(png_ptr, info_ptr, surface->w, surface->h, 8, colortype,
+        PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
+        PNG_FILTER_TYPE_DEFAULT);
+
+    png_write_info(png_ptr, info_ptr);
+
+    png_set_packing(png_ptr);
+
+    row_pointers = new png_bytep[surface->h];
+    if (!row_pointers)
+    {
+        logger->log1("Had trouble converting surface to row pointers");
+        fclose(fp);
+        return false;
+    }
+
+    for (int i = 0; i < surface->h; i++)
+    {
+        row_pointers[i] = (png_bytep)(Uint8 *)surface->pixels
+                          + i * surface->pitch;
+    }
+
+    png_write_image(png_ptr, row_pointers);
+    png_write_end(png_ptr, info_ptr);
+
+    fclose(fp);
+
+    delete [] row_pointers;
+
+    png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
+
+    if (SDL_MUSTLOCK(surface))
+        SDL_UnlockSurface(surface);
+
+    return true;
+}