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backends/platform/psp/png_loader.h

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+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#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 errorFn(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;
+	Buffer::HowToSize _sizeBy;
+
+	// PNG lib values
+	int _bitDepth;
+	png_structp _pngPtr;
+	png_infop _infoPtr;
+	int _colorType;
+	uint32 _channels;
+
+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), _channels(0) {}
+	~PngLoader();
+
+	PngLoader::Status allocate();
+	bool load();
+};
+
+#endif /* PSP_PNG_IMAGE_H */