C# (CSharp) Recurity.Swf Namespace

A list of ARGB records. ARGB is the same as RGBA but the first byte is the alpha channel

The ALPHACOLORMAPDATA extends COLORMAPDATA by using RGBA

insteadf of RGB for the image data.

The BITMAPDATA structure contains image data. This

structure is compressed as a single block of data.

The COLORMAPDATA structure contains image data. This

structure is compressed as a single block of data.

Row widths in the pixel data fields of these structures

must be rounded up to the next 32-bit word boundary.

For example, an 8-bit image that is 253 pixels wide must be

padded out to 256 bytes per line. To determine the appropriate

padding, make sure to take into account the actual size of

the individual pixel structures; 15-bit pixels occupy 2

bytes and 24-bit pixels occupy 4 bytes (see PIX15 and PIX24).

A FOCALGRADIENT must be declared in DefineShape4—not DefineShape, DefineShape2

or DefineShape3.

The value range is from -1.0 to 1.0, where -1.0 means the focal point is close to the left border

of the radial gradient circle, 0.0 means that the focal point is in the center of the radial

gradient circle, and 1.0 means that the focal point is close to the right border of the radial

gradient circle.

The GLYPHENTRY structure describes a single character in a line of text. It is composed of

an index into the current font’s glyph table, and an advance value. The advance value is the

horizontal distance between the reference point of this character and the reference point of the

following character.

Swf 8 and later supports up to 15 gradient control points, spread modes and a new

interpolation type.

Note that for the DefineShape, DefineShape2 or DefineShape3 tags, the SpreadMode and

InterpolationMode fields must be 0, and the NumGradients field can not exceed 8.

Source: Adobe[swf_file_format_spec_v10.pdf]

A Kerning Record defines the distance between two glyphs in EM square coordinates. Certain

pairs of glyphs appear more aesthetically pleasing if they are moved closer together, or farther

apart. The FontKerningCode1 and FontKerningCode2 fields are the character codes for the

left and right characters. The FontKerningAdjustment field is a signed integer that defines a

value to be added to the advance value of the left character.

MORPHLINESTYLE2 builds upon the capabilities of the MORPHLINESTYLE record by

allowing the use of new types of joins and caps as well as scaling options and the

ability to fill morph strokes.

The RGBA record represents a color as 32-bit red, green, blue and alpha value. An RGBA

color with an alpha value of 255 is completely opaque. An RGBA color with an alpha value of

zero is completely transparent. Alpha values between zero and 255 are partially transparent.

The SHAPEWITHSTYLE structure extends the SHAPE structure by including fill style and

line style information. SHAPEWITHSTYLE is used by the DefineShape tag.

The story of byte aligness is the following. Structures are byte aligned if they only read byte aligned

structures or if the last read opreration has been an integer type or an other byte aligned structure. Sounds

complicated but it isn't.

Lets assume Stream.Postion is 0 and BitStream.Position is 0.

we read 3 bits: bits.GetBits( 3 ); Stream.Postion is 1 and BitStream.Position is 3

we read a byte: br.ReadByte(); Stream.Postion is 2 and BitStream.Position is 3

we read 3 bits: bits.GetBits( 3 ); Stream.Postion is 3 and BitStream.Position is 6

but after reading a byte aligned structure the first 3 bits should be {0,1,2}.

That is the reason why we have to reset the BitStream.Position before or after we red a byte aligned

structure.

The style change record is also a non-edge record. It can be used to do the following:

1. Select a fill or line style for drawing.

2. Move the current drawing position (without drawing).

3. Replace the current fill and line style arrays with a new set of styles.

The advanced text rendering engine uses alignment zones to establish

the borders of a glyph for pixel snapping.

Alignment zones are critical for high-quality display of fonts.