PSP: factored PngLoader out of virtual keyboard for further use

svn-id: r53108

1 files changed, 70 insertions, 0 deletions

diff --git a/backends/platform/psp/png_loader.h b/backends/platform/psp/png_loader.h
new file mode 100644
index 0000000000..5f2064bf96
--- /dev/null
+++ b/backends/platform/psp/png_loader.h
@@ -0,0 +1,70 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 (at your option) 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#ifndef PSP_PNG_IMAGE_H
+#define PSP_PNG_IMAGE_H
+
+#include <png.h>
+
+class PngLoader {
+private:
+	bool basicImageLoad();		// common operation
+	bool findImageDimensions();	// find dimensions of a given PNG file
+	bool loadImageIntoBuffer();
+
+	static void warningFn(png_structp png_ptr, png_const_charp warning_msg);
+	static void libReadFunc(png_structp pngPtr, png_bytep data, png_size_t length);
+	
+	Common::SeekableReadStream *_file;
+	Buffer *_buffer;
+	Palette *_palette;
+	
+	uint32 _width;
+	uint32 _height;
+	uint32 _paletteSize;
+	int _bitDepth;
+	Buffer::HowToSize _sizeBy;
+	png_structp _pngPtr;
+	png_infop _infoPtr;
+	int _colorType;
+	
+public:
+	enum Status {
+		OK,
+		OUT_OF_MEMORY,
+		BAD_FILE
+	};
+
+	PngLoader(Common::SeekableReadStream *file, Buffer &buffer, Palette &palette, 
+		Buffer::HowToSize sizeBy = Buffer::kSizeByTextureSize) :
+			_file(file), _buffer(&buffer), _palette(&palette), 
+			_width(0), _height(0), _paletteSize(0), 
+			_bitDepth(0), _sizeBy(sizeBy), _pngPtr(0), _infoPtr(0), _colorType(0) {}
+	
+	PngLoader::Status allocate();
+	bool load();	
+};
+
+#endif /* PSP_PNG_IMAGE_H */