added resizer

lib/danbooru_image_resizer/PNGReader.h

@@ -0,0 +1,37 @@
+#ifndef PNG_READER_H
+#define PNG_READER_H
+
+#include <png.h>
+#include "Reader.h"
+#include "RowBuffer.h"
+
+struct png_error_info
+{
+	char *err;
+};
+
+class PNG: public Reader
+{
+public:
+	PNG()
+	{
+		m_Done = false;
+	}
+
+	bool Read(FILE *f, Resizer *resizer, char error[1024]);
+
+private:
+	RowBuffer m_Rows;
+	Resizer *m_Resizer;
+
+	bool m_Done;
+	int m_Passes;
+
+	static void Error(png_struct *png, const char *error);
+	static void Warning(png_struct *png, const char *warning);
+	static void InfoCallback(png_struct *png, png_info *info_ptr);
+	static void RowCallback(png_struct *png, png_byte *new_row, png_uint_32 row_num, int pass);
+	static void EndCallback(png_struct *png, png_info *info);
+};
+
+#endif