rem: png_set_IHDR(png_ptr, info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB_ALPHA,  PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);  png_write_info(png_ptr, info_ptr);
context: void SaveToPNG(const char *filename, const BRect &bounds, color_space space, 	const void *bits, const int32 &bitslength, const int32 bytesperrow){#ifdef DEBUG_PNGDUMPprintf("SaveToPNG: %s ",filename);bounds.PrintToStream();#endif	FILE *fp;	png_structp png_ptr;	png_infop info_ptr;		fp=fopen(filename, "wb");	if(fp==NULL)	{#ifdef DEBUG_PNGDUMPprintf("Couldn't open file\n");#endif		return;	}		png_ptr=png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);		if(png_ptr==NULL)	{#ifdef DEBUG_PNGDUMPprintf("Couldn't create write struct\n");#endif		fclose(fp);		return;	}		info_ptr=png_create_info_struct(png_ptr);	if(info_ptr==NULL)	{#ifdef DEBUG_PNGDUMPprintf("Couldn't create info struct\n");#endif		fclose(fp);		png_destroy_write_struct(&png_ptr, (png_infopp)NULL);		return;	}		if(setjmp(png_ptr->jmpbuf))	{#ifdef DEBUG_PNGDUMPprintf("Couldn't set jump\n");#endif		fclose(fp);		png_destroy_write_struct(&png_ptr, (png_infopp)NULL);		return;	}		png_init_io(png_ptr, fp);	//	png_set_compression_level(png_ptr, Z_NO_COMPRESSION);		png_set_bgr(png_ptr);	int32 width = bounds.IntegerWidth() + 1;	int32 height = bounds.IntegerHeight() + 1;	   	png_set_IHDR(png_ptr, info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB_ALPHA,//				 PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);				 PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);		png_write_info(png_ptr, info_ptr);	png_byte* row_pointers[height];	png_byte* index = (png_byte*)bits;	for (int32 i = 0; i < height; i++) {		row_pointers[i] = index;		index += bytesperrow;	}	png_write_image(png_ptr, row_pointers);	png_write_end(png_ptr, info_ptr);		png_destroy_write_struct(&png_ptr, (png_infopp)NULL);	fclose(fp);}