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authorAndrei Karas <akaras@inbox.ru>2017-09-18 18:57:19 +0300
committerAndrei Karas <akaras@inbox.ru>2017-09-18 18:57:19 +0300
commite7537ca6033a13ff1d21aac4a61a49ef325684b6 (patch)
tree5495e120bbb8108677fcdcde1cbc77a2417fc5d3 /src/utils/pnglib.cpp
parent0f7c14085321a54ad8c442041d3a26f5dfed5fd1 (diff)
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Move imagewriter into utils directory and rename to pnglib.
Diffstat (limited to 'src/utils/pnglib.cpp')
-rw-r--r--src/utils/pnglib.cpp113
1 files changed, 113 insertions, 0 deletions
diff --git a/src/utils/pnglib.cpp b/src/utils/pnglib.cpp
new file mode 100644
index 000000000..d472bd565
--- /dev/null
+++ b/src/utils/pnglib.cpp
@@ -0,0 +1,113 @@
+/*
+ * The ManaPlus Client
+ * Copyright (C) 2004-2009 The Mana World Development Team
+ * Copyright (C) 2009-2010 The Mana Developers
+ * Copyright (C) 2011-2017 The ManaPlus Developers
+ *
+ * This file is part of The ManaPlus 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 "utils/pnglib.h"
+
+#include "utils/cast.h"
+#include "utils/checkutils.h"
+
+#include <png.h>
+PRAGMA48(GCC diagnostic push)
+PRAGMA48(GCC diagnostic ignored "-Wshadow")
+#include <SDL_video.h>
+PRAGMA48(GCC diagnostic pop)
+
+#include "debug.h"
+
+bool PngLib::writePNG(SDL_Surface *const surface,
+ const std::string &filename)
+{
+ if (surface == nullptr)
+ return false;
+
+
+ if (SDL_MUSTLOCK(surface))
+ SDL_LockSurface(surface);
+
+ png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
+ nullptr, nullptr, nullptr);
+ if (png_ptr == nullptr)
+ {
+ reportAlways("Had trouble creating png_structp");
+ return false;
+ }
+
+ png_infop info_ptr = png_create_info_struct(png_ptr);
+ if (info_ptr == nullptr)
+ {
+ png_destroy_write_struct(&png_ptr, static_cast<png_infopp>(nullptr));
+ reportAlways("Could not create png_info");
+ return false;
+ }
+
+ if (setjmp(png_jmpbuf(png_ptr)))
+ {
+ png_destroy_write_struct(&png_ptr, &info_ptr);
+ reportAlways("problem writing to %s", filename.c_str());
+ return false;
+ }
+
+ FILE *const fp = fopen(filename.c_str(), "wb");
+ if (fp == nullptr)
+ {
+ reportAlways("could not open file %s for writing",
+ filename.c_str());
+ return false;
+ }
+
+ png_init_io(png_ptr, fp);
+
+ const int 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);
+
+ png_bytep *const row_pointers
+ = new png_bytep[CAST_SIZE(surface->h)];
+
+ for (int i = 0; i < surface->h; i++)
+ {
+ row_pointers[i] = static_cast<png_bytep>(static_cast<uint8_t *>(
+ surface->pixels) + CAST_SIZE(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,
+ &info_ptr);
+
+ if (SDL_MUSTLOCK(surface))
+ SDL_UnlockSurface(surface);
+
+ return true;
+}