Windows 7 opentype vs truetype

OpenType fonts can also include typographic refinements such as true small caps, different styles of figures, and extensive sets of ligatures and alternates, as well as complete sets of accented characters and diacritical marks. Different applications have differing levels of support for all the OpenType features. OpenType version 1. The standard was published in , and is now freely available for download from ITTF website. The Type 1 data can be rasterized by a Type 1 rasterizer such as Adobe Type Manager if installed, or converted to TrueType data for rasterization by the TrueType rasterizer.

The exact rasterization behavior will be a function of the rasterizers present in the system, and user preference. This font format is a superset of the existing TrueType and Type 1 formats, which is designed to provide great support for type in print and on-screen. In addition, the subsetting and compression technology of OpenType makes the OpenType initiative especially relevant to the Internet and the World Wide Web, since it allows for fast download of type.

So far as customers are concerned, fonts just work. OpenType handles all fonts with a unified registry, which means that both Type 1 and TrueType fonts will be reliably supported across all platforms. In addition, by working together Adobe and Microsoft will drive innovations in quality and on-screen support, resulting in better more viewable fonts for customers.

The signature for the function is:. The easiest way to by-pass these functions is to flag storage location 22 with zero, indicating not to use DStroke or IStroke, otherwise we would have to clean up the stack.

The reason that DStroke does not work, is the following. DStroke brings pairs of points to the same y or x , MIRP[…r…] the floating point, and then moves it back to the old y or x. Now that we re-interpret no round on the MIRP, CVT cut-in actually gets to cut in, the original distance gets to apply, just that the original distance is taken prior to bringing points to the same y or x , meaning it is likely to be way off.

As a result, the diagonal stroke weight in x starts to depend heavily on the distance in y of the control points involved, which is not what we want. Similar to the DStroke and IStroke, there are some spacing functions which also are not meant to work with non-square aspect ratios. Therefore the rasterizer pretends to be in non-square aspect ratio in these cases as well.

To avoid bloated characters, we are avoiding some specific functions for spacing. We are assuming that functions 0, 1, 2, 4, 7, and 8 are support functions for this spacing code, which may squish characters or pull them left or right or in both directions at the same time.

This has to do amongst other things with using the twilight zone. The spacing algorithm is meant to be turned off above a certain size, such as 30 PPEm, hence we may argue that with the extra visual resolution we should turn it off at a considerably smaller PPEm size, or altogether. Storage location 24 is used to bypass the function. The signature for the function is one of the following:.

Some fonts use a diagonal stroke method which made some italic fonts upright or back-slanted under ClearType. Therefore, the interpreter identifies the respective support function and pretends an alternative CVT cut-in value.

We are assuming that function 58 handles the diagonal stroke. If the signature matches the following code we will change the CVT cut-in value. Some fonts used the old TypeMan Talk VacuFormRound command, which may work on certain bi-level pixel patterns, but which invariably creates diamonds in ClearType.

Therefore, the interpreter attempts to skip all related code. Storage location 8 will return zero to stop most VacuFormRounds. In the case of a Type 2 VacuFormRound, the MD instruction, while in the VacuFormRound, will slightly increment the projection vector by the smallest possible amount 1 to throw off Type 2 VacuForms which are keyed off a distance being exactly 1 pixel.

As previously mentioned, the precision of ClearType rasterization can integrate quite naturally with the TrueType interpreter. When fonts are hinted with ClearType in mind, they can be proofed to verify that the hints work appropriately with ClearType and other rasterization techniques.

There is additional support in the TrueType instruction set to help fonts optimize for ClearType and to help prevent other types of problems as we have discussed with backwards compatibility.

The instruction is used by setting one or more selector bits and the return value on the stack is a bit or group of bits based on which selector bits were set. These selector bits and return value bits are fully documented in the TrueType instruction specification, but it is worthwhile describing the ClearType related values. This flag is requested by setting selector bit six.

If the return bit thirteen is set it indicates that the glyphs for this size will be rendered with ClearType rendering. This flag is requested by setting selector bit seven. If the return bit fourteen is set, this indicates that the glyphs for this font size will be adjusted post hinting in order to return advance widths that are exactly the same as bi-level rendering.

If the return bit fourteen is not set, then the advanced widths will be either returned as integers rounded to the nearest pixel or rounded to the nearest sixteenth of a pixel.

The former is referred to as natural widths ClearType and the later as sub-pixel positioned ClearType. At larger sizes ClearType performs better with a symmetrical rendering solution. This later solution tends to create more blur at lower sizes but prevents aliasing at higher sizes.

This flag is requested by setting selector bit eight. As all this information is deeply buried inside the font resources, it is way more convenient to use a font manager like MainType :. You can then ensure you are using the most recent version of your fonts that come with the most up-to-date OpenType layout features. If they want you to use fonts containing OpenType layout features, then they should talk about that. Pure TrueType fonts are legacy and should be avoided. We like to compare TrueType fonts with a square, and OpenType added an apex on top of it.

With this new dimension it turned the square into a pyramid. Sure the base is still a square, but when you see a pyramid, would you call it a square? So, font file extensions mean nothing. You need to investigate the font internals to ensure what outline format is used and what OpenType layout features come with the font. We recommend using a font manager like MainType to inspect your fonts.

When you have the option to choose between a font with TrueType based outlines and one with CFF based outlines, take the one with the best language support, and sufficient OpenType layout features. FontCreator MainType Scanahand. Hope that clears up any confusion. Yes, the Mac vs Win war managed to screw up even a shared font-format. Show 7 more comments.

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