similar

struct swf_line_style {
	if(f_tag == DefineMorphShape) {
		unsigned short twips	f_width;
		unsigned short twips	f_width_morph;
		swf_rgba		f_rgba;
		swf_rgba		f_rgba_morph;
	}
	else if(f_tag == DefineShape4 || f_tag == DefineMorphShape2) {
		unsigned short twips	f_width;
		if(f_tag == DefineMorphShape2) {
			unsigned short twips	f_width_morph;
		}
		unsigned		f_start_cap_style : 2;
		unsigned		f_join_style : 2;
		unsigned		f_has_fill : 1;
		unsigned		f_no_hscale : 1;
		unsigned		f_no_vscale : 1;
		unsigned		f_pixel_hinting : 1;
		unsigned		f_reserved : 5;
		unsigned		f_no_close : 1;
		unsigned		f_end_cap_style : 2;
		if(f_join_style == 2) {
			unsigned short fixed	f_miter_limit_factor;
		}
		if(f_has_fill) {
			swf_fill_style		f_fill_style;
		}
		else {
			swf_rgba		f_rgba;
			if(f_tag == DefineMorphShape2) {
				swf_rgba		f_rgba_morph;
			}
		}
	}
	else if(f_tag == DefineShape3) {
		unsigned short twips	f_width;
		swf_rgba		f_rgba;
	}
	else {
		unsigned short twips	f_width;
		swf_rgb				f_rgb;
	}
};

The width of the line is in TWIPS (1/20th of a pixel).

The f_start_cap_style and f_end_cap_style can be:

• 0 - Round cap,
• 1 - No cap,
• 2 - Square cap.

Round is the default, the way line caps looked before version 8. No Cap means that nothing is added at the tip of the line. This means the line stops exactly where you say it should end. The Square Cap is like the No Cap, but it has the cap which is about Width / 2.

The f_join_style can be:

This is an interesting concept: have a tag that can clear everything that we have done so far and start over. If you have a single time line, this is certainly useful. Since version 3, however, we get the DefineSprite tag that has a very similar capability (except that it does not have the ability to delete anything from memory, this comes in version 5 with access to external animations that can be created and thrown away dynamically.)

A double float is a standard IEEE 754 floating point value of 64 bits.

The value is defined as follow:

• 1 bit for the sign
• 11 bits for the exponent
• 52 bits for the mantissa

This type is similar to most processor double float type and can thus be used directly.

Note that in some cases, double floats are saved with the lower 32 bits of their mantissa after the upper bits. In other wise, the two 32 bits value are swapped.

struct swf_definesound {
	swf_tag			f_tag;		/* 14 */
	unsigned short		f_sound_id;
	unsigned		f_sound_format : 4;
	unsigned		f_sound_rate : 2;
	unsigned		f_sound_is_16bits : 1;
	unsigned		f_sound_is_stereo : 1;
	unsigned long		f_sound_samples_count;
	unsigned char		f_sound_data[<variable size>];
};

A DefineSound tag declares a set of samples of a sound effect or a music.

The sound samples can be compressed or not, stereo or not and 8 or 16 bits. The different modes are not all available in version 2, although the same tag is used in newer versions with additional capabilities.

The f_sound_is_16bits is always set to 1 (16bits samples) if the samples are compressed (neither Rawnor Uncompressed).

The f_sound_rate represents the rate at which the samples are defined. The rate at which it will be played on the target computers may differ. The following equation can be used to determine the ...

struct swf_definebitsjpeg {
	swf_long_tag		f_tag;		/* 6, 21, 35 or 90 */
	unsigned short		f_image_id;
	if(f_tag == DefineBitsJPEG3 + f_tag == DefineBitsJPEG4) {
		/* sizeof(f_encoding_tables) + sizeof(f_image_data) + 2 when JPEG4 */
		unsigned long		f_offset_to_alpha;
	}
	if(f_tag == DefineBitsJPEG4) {
		unsigned short fixed	f_deblocking_filter_parameter;
	}
	if(f_tag != DefineBitsJPEG) {
		/* when DefineBitsJPEG, use JPEGTables instead */
		unsigned char		f_encoding_tables[<variable size>];
	}
	unsigned char		f_image_data[<variable size>];
	if(f_tag == DefineBitsJPEG3 || f_tag == DefineBitsJPEG4) {
		unsigned char		f_alpha[<variable size>];
	}
};

These tags define an image saved using the JPEG compression scheme.

DefineBitsJPEG (V1.0) does not include the encoding tables which are defined in the unique JPEGTables tag instead. All the DefineBitsJPEG of an SWF file use the only JPEGTables tag. Yes... This means you need a tool that is capable of reusing the same tables over and over again to make sure that all your DefineBitsJPEGs work properly (or use it just once.)

The other tags incorporate their own version of the JPEG encoding tables.

The DefineBitsJPEG3 and DefineBitsJPEG4 support an alpha channel bit plane (8 bits.) ...

struct swf_defineshape {
	swf_tag				f_tag;		/* 2, 22, 32, 46, 83, or 84 */
	unsigned short			f_shape_id;
	swf_rect			f_rect;
	is_morph = f_tag == DefineMorphShape || f_tag == DefineMorphShape2;
	has_strokes = f_tag == DefineShape4 || f_tag == DefineMorphShape2;
	if(is_morph) {
		swf_rect			f_rect_morph;
	}
	if(has_strokes) {
		swf_rect			f_stroke_rect;
		if(is_morph) {
			swf_rect			f_stroke_rect_morph;
		}
		unsigned			f_define_shape_reserved : 6;
		unsigned			f_define_shape_non_scaling_strokes : 1;
		unsigned			f_define_shape_scaling_strokes : 1;
	}
	if(is_morph) {
		unsigned long			f_offset_morph;
		swf_morph_shape_with_style	f_morph_shape_with_style;
	}
	else {
		swf_shape_with_style		f_shape_with_style;
	}
};

These are probably the most important tags in this reference. They are used to define a shape using Bezier curves and lines with different styles. The DefineShape of V1.0 is usually enough unless you need a large number of styles or you want to specify colors with an alpha channel (RGBA).

Brief History

At the very beginning, a company created the SWF format to generate small vector animations on the Internet called Shockwave Flash (hence the name of the format, SWF.) It also included images. This company was bought by Macromedia around 1997 (if I recall properly). This is when Flash v3 was created. Since then, Macromedia created a new version about once a year up to version 8. At that time (in 2005/2006), Macromedia sealed a deal with Adobe which wanted to use the SWF format in their PDF files.

Today (May 1st, 2008), the SWF format is available for free to all.

There was ...

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