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# Revision history for fountainhead
## Unreleased

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Mozilla Public License Version 2.0
==================================
1. Definitions
--------------
1.1. "Contributor"
means each individual or legal entity that creates, contributes to
the creation of, or owns Covered Software.
1.2. "Contributor Version"
means the combination of the Contributions of others (if any) used
by a Contributor and that particular Contributor's Contribution.
1.3. "Contribution"
means Covered Software of a particular Contributor.
1.4. "Covered Software"
means Source Code Form to which the initial Contributor has attached
the notice in Exhibit A, the Executable Form of such Source Code
Form, and Modifications of such Source Code Form, in each case
including portions thereof.
1.5. "Incompatible With Secondary Licenses"
means
(a) that the initial Contributor has attached the notice described
in Exhibit B to the Covered Software; or
(b) that the Covered Software was made available under the terms of
version 1.1 or earlier of the License, but not also under the
terms of a Secondary License.
1.6. "Executable Form"
means any form of the work other than Source Code Form.
1.7. "Larger Work"
means a work that combines Covered Software with other material, in
a separate file or files, that is not Covered Software.
1.8. "License"
means this document.
1.9. "Licensable"
means having the right to grant, to the maximum extent possible,
whether at the time of the initial grant or subsequently, any and
all of the rights conveyed by this License.
1.10. "Modifications"
means any of the following:
(a) any file in Source Code Form that results from an addition to,
deletion from, or modification of the contents of Covered
Software; or
(b) any new file in Source Code Form that contains any Covered
Software.
1.11. "Patent Claims" of a Contributor
means any patent claim(s), including without limitation, method,
process, and apparatus claims, in any patent Licensable by such
Contributor that would be infringed, but for the grant of the
License, by the making, using, selling, offering for sale, having
made, import, or transfer of either its Contributions or its
Contributor Version.
1.12. "Secondary License"
means either the GNU General Public License, Version 2.0, the GNU
Lesser General Public License, Version 2.1, the GNU Affero General
Public License, Version 3.0, or any later versions of those
licenses.
1.13. "Source Code Form"
means the form of the work preferred for making modifications.
1.14. "You" (or "Your")
means an individual or a legal entity exercising rights under this
License. For legal entities, "You" includes any entity that
controls, is controlled by, or is under common control with You. For
purposes of this definition, "control" means (a) the power, direct
or indirect, to cause the direction or management of such entity,
whether by contract or otherwise, or (b) ownership of more than
fifty percent (50%) of the outstanding shares or beneficial
ownership of such entity.
2. License Grants and Conditions
--------------------------------
2.1. Grants
Each Contributor hereby grants You a world-wide, royalty-free,
non-exclusive license:
(a) under intellectual property rights (other than patent or trademark)
Licensable by such Contributor to use, reproduce, make available,
modify, display, perform, distribute, and otherwise exploit its
Contributions, either on an unmodified basis, with Modifications, or
as part of a Larger Work; and
(b) under Patent Claims of such Contributor to make, use, sell, offer
for sale, have made, import, and otherwise transfer either its
Contributions or its Contributor Version.
2.2. Effective Date
The licenses granted in Section 2.1 with respect to any Contribution
become effective for each Contribution on the date the Contributor first
distributes such Contribution.
2.3. Limitations on Grant Scope
The licenses granted in this Section 2 are the only rights granted under
this License. No additional rights or licenses will be implied from the
distribution or licensing of Covered Software under this License.
Notwithstanding Section 2.1(b) above, no patent license is granted by a
Contributor:
(a) for any code that a Contributor has removed from Covered Software;
or
(b) for infringements caused by: (i) Your and any other third party's
modifications of Covered Software, or (ii) the combination of its
Contributions with other software (except as part of its Contributor
Version); or
(c) under Patent Claims infringed by Covered Software in the absence of
its Contributions.
This License does not grant any rights in the trademarks, service marks,
or logos of any Contributor (except as may be necessary to comply with
the notice requirements in Section 3.4).
2.4. Subsequent Licenses
No Contributor makes additional grants as a result of Your choice to
distribute the Covered Software under a subsequent version of this
License (see Section 10.2) or under the terms of a Secondary License (if
permitted under the terms of Section 3.3).
2.5. Representation
Each Contributor represents that the Contributor believes its
Contributions are its original creation(s) or it has sufficient rights
to grant the rights to its Contributions conveyed by this License.
2.6. Fair Use
This License is not intended to limit any rights You have under
applicable copyright doctrines of fair use, fair dealing, or other
equivalents.
2.7. Conditions
Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
in Section 2.1.
3. Responsibilities
-------------------
3.1. Distribution of Source Form
All distribution of Covered Software in Source Code Form, including any
Modifications that You create or to which You contribute, must be under
the terms of this License. You must inform recipients that the Source
Code Form of the Covered Software is governed by the terms of this
License, and how they can obtain a copy of this License. You may not
attempt to alter or restrict the recipients' rights in the Source Code
Form.
3.2. Distribution of Executable Form
If You distribute Covered Software in Executable Form then:
(a) such Covered Software must also be made available in Source Code
Form, as described in Section 3.1, and You must inform recipients of
the Executable Form how they can obtain a copy of such Source Code
Form by reasonable means in a timely manner, at a charge no more
than the cost of distribution to the recipient; and
(b) You may distribute such Executable Form under the terms of this
License, or sublicense it under different terms, provided that the
license for the Executable Form does not attempt to limit or alter
the recipients' rights in the Source Code Form under this License.
3.3. Distribution of a Larger Work
You may create and distribute a Larger Work under terms of Your choice,
provided that You also comply with the requirements of this License for
the Covered Software. If the Larger Work is a combination of Covered
Software with a work governed by one or more Secondary Licenses, and the
Covered Software is not Incompatible With Secondary Licenses, this
License permits You to additionally distribute such Covered Software
under the terms of such Secondary License(s), so that the recipient of
the Larger Work may, at their option, further distribute the Covered
Software under the terms of either this License or such Secondary
License(s).
3.4. Notices
You may not remove or alter the substance of any license notices
(including copyright notices, patent notices, disclaimers of warranty,
or limitations of liability) contained within the Source Code Form of
the Covered Software, except that You may alter any license notices to
the extent required to remedy known factual inaccuracies.
3.5. Application of Additional Terms
You may choose to offer, and to charge a fee for, warranty, support,
indemnity or liability obligations to one or more recipients of Covered
Software. However, You may do so only on Your own behalf, and not on
behalf of any Contributor. You must make it absolutely clear that any
such warranty, support, indemnity, or liability obligation is offered by
You alone, and You hereby agree to indemnify every Contributor for any
liability incurred by such Contributor as a result of warranty, support,
indemnity or liability terms You offer. You may include additional
disclaimers of warranty and limitations of liability specific to any
jurisdiction.
4. Inability to Comply Due to Statute or Regulation
---------------------------------------------------
If it is impossible for You to comply with any of the terms of this
License with respect to some or all of the Covered Software due to
statute, judicial order, or regulation then You must: (a) comply with
the terms of this License to the maximum extent possible; and (b)
describe the limitations and the code they affect. Such description must
be placed in a text file included with all distributions of the Covered
Software under this License. Except to the extent prohibited by statute
or regulation, such description must be sufficiently detailed for a
recipient of ordinary skill to be able to understand it.
5. Termination
--------------
5.1. The rights granted under this License will terminate automatically
if You fail to comply with any of its terms. However, if You become
compliant, then the rights granted under this License from a particular
Contributor are reinstated (a) provisionally, unless and until such
Contributor explicitly and finally terminates Your grants, and (b) on an
ongoing basis, if such Contributor fails to notify You of the
non-compliance by some reasonable means prior to 60 days after You have
come back into compliance. Moreover, Your grants from a particular
Contributor are reinstated on an ongoing basis if such Contributor
notifies You of the non-compliance by some reasonable means, this is the
first time You have received notice of non-compliance with this License
from such Contributor, and You become compliant prior to 30 days after
Your receipt of the notice.
5.2. If You initiate litigation against any entity by asserting a patent
infringement claim (excluding declaratory judgment actions,
counter-claims, and cross-claims) alleging that a Contributor Version
directly or indirectly infringes any patent, then the rights granted to
You by any and all Contributors for the Covered Software under Section
2.1 of this License shall terminate.
5.3. In the event of termination under Sections 5.1 or 5.2 above, all
end user license agreements (excluding distributors and resellers) which
have been validly granted by You or Your distributors under this License
prior to termination shall survive termination.
************************************************************************
* *
* 6. Disclaimer of Warranty *
* ------------------------- *
* *
* Covered Software is provided under this License on an "as is" *
* basis, without warranty of any kind, either expressed, implied, or *
* statutory, including, without limitation, warranties that the *
* Covered Software is free of defects, merchantable, fit for a *
* particular purpose or non-infringing. The entire risk as to the *
* quality and performance of the Covered Software is with You. *
* Should any Covered Software prove defective in any respect, You *
* (not any Contributor) assume the cost of any necessary servicing, *
* repair, or correction. This disclaimer of warranty constitutes an *
* essential part of this License. No use of any Covered Software is *
* authorized under this License except under this disclaimer. *
* *
************************************************************************
************************************************************************
* *
* 7. Limitation of Liability *
* -------------------------- *
* *
* Under no circumstances and under no legal theory, whether tort *
* (including negligence), contract, or otherwise, shall any *
* Contributor, or anyone who distributes Covered Software as *
* permitted above, be liable to You for any direct, indirect, *
* special, incidental, or consequential damages of any character *
* including, without limitation, damages for lost profits, loss of *
* goodwill, work stoppage, computer failure or malfunction, or any *
* and all other commercial damages or losses, even if such party *
* shall have been informed of the possibility of such damages. This *
* limitation of liability shall not apply to liability for death or *
* personal injury resulting from such party's negligence to the *
* extent applicable law prohibits such limitation. Some *
* jurisdictions do not allow the exclusion or limitation of *
* incidental or consequential damages, so this exclusion and *
* limitation may not apply to You. *
* *
************************************************************************
8. Litigation
-------------
Any litigation relating to this License may be brought only in the
courts of a jurisdiction where the defendant maintains its principal
place of business and such litigation shall be governed by laws of that
jurisdiction, without reference to its conflict-of-law provisions.
Nothing in this Section shall prevent a party's ability to bring
cross-claims or counter-claims.
9. Miscellaneous
----------------
This License represents the complete agreement concerning the subject
matter hereof. If any provision of this License is held to be
unenforceable, such provision shall be reformed only to the extent
necessary to make it enforceable. Any law or regulation which provides
that the language of a contract shall be construed against the drafter
shall not be used to construe this License against a Contributor.
10. Versions of the License
---------------------------
10.1. New Versions
Mozilla Foundation is the license steward. Except as provided in Section
10.3, no one other than the license steward has the right to modify or
publish new versions of this License. Each version will be given a
distinguishing version number.
10.2. Effect of New Versions
You may distribute the Covered Software under the terms of the version
of the License under which You originally received the Covered Software,
or under the terms of any subsequent version published by the license
steward.
10.3. Modified Versions
If you create software not governed by this License, and you want to
create a new license for such software, you may create and use a
modified version of this License if you rename the license and remove
any references to the name of the license steward (except to note that
such modified license differs from this License).
10.4. Distributing Source Code Form that is Incompatible With Secondary
Licenses
If You choose to distribute Source Code Form that is Incompatible With
Secondary Licenses under the terms of this version of the License, the
notice described in Exhibit B of this License must be attached.
Exhibit A - Source Code Form License Notice
-------------------------------------------
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at http://mozilla.org/MPL/2.0/.
If it is not possible or desirable to put the notice in a particular
file, then You may include the notice in a location (such as a LICENSE
file in a relevant directory) where a recipient would be likely to look
for such a notice.
You may add additional accurate notices of copyright ownership.
Exhibit B - "Incompatible With Secondary Licenses" Notice
---------------------------------------------------------
This Source Code Form is "Incompatible With Secondary Licenses", as
defined by the Mozilla Public License, v. 2.0.

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TrueType font parser.

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cabal-version: 2.4
name: fountainhead
version: 0.1.0.0
synopsis: TrueType font parser
description: TrueType font parseer.
bug-reports: https://git.caraus.tech/OSS/fountainhead
license-files: LICENSE
license: MPL-2.0
author: Eugen Wissner
maintainer: belka@caraus.de
copyright: (c) 2023 Eugen Wissner
category: Graphics
extra-source-files:
CHANGELOG.md
README.txt
library
exposed-modules:
Graphics.Fountainhead.Parser
Graphics.Fountainhead.Type
Graphics.Fountainhead.TrueType
hs-source-dirs:
src
build-depends:
base ^>=4.16.3.0,
bytestring ^>= 0.11.0,
containers ^>= 0.6.5,
megaparsec ^>= 9.3,
time ^>= 1.12,
vector ^>= 0.13.0

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{-# LANGUAGE DuplicateRecordFields #-}
-- | Types representing a TrueType font.
module Graphics.Fountainhead.TrueType
( BArmStyle(..)
, BContrast(..)
, BFamilyType(..)
, BLetterform(..)
, BMidline(..)
, BProportion(..)
, BSerifStyle(..)
, BStrokeVariation(..)
, BWeight(..)
, BXHeight(..)
, CVTable(..)
, CmapSubtable(..)
, CmapTable(..)
, CmapEncoding(..)
, CmapFormat0Table(..)
, CmapFormat2Subheader(..)
, CmapFormat2Table(..)
, CmapFormat4Table(..)
, CmapFormat6Table(..)
, CmapGroup(..)
, CmapFormat8Table(..)
, CmapFormat10Table(..)
, CmapFormat12Table(..)
, CmapFormat13Table
, CmapFormat14Table(..)
, ComponentGlyphFlags(..)
, ComponentGlyphPartDescription(..)
, CompoundGlyphDefinition(..)
, DeviceRecord(..)
, FpgmTable(..)
, FontDirectionHint(..)
, FontDirectory(..)
, FontStyle(..)
, GlyfTable(..)
, GlyphArgument(..)
, GlyphCoordinate(..)
, GlyphDefinition(..)
, GlyphDescription(..)
, GlyphTransformationOption(..)
, HdmxTable(..)
, HeadTable(..)
, HheaTable(..)
, HmtxTable(..)
, LocaTable(..)
, LongHorMetric(..)
, MaxpTable(..)
, NameRecord(..)
, NameTable(..)
, OffsetSubtable(..)
, OpenMaxpTable(..)
, Os2BaseFields(..)
, Os2MicrosoftFields(..)
, Os2Table(..)
, Os2Version1Fields(..)
, Os2Version4Fields(..)
, Os2Version5Fields(..)
, OutlineFlag(..)
, Panose(..)
, PostFormat2Table(..)
, PostHeader(..)
, PostSubtable(..)
, PostTable(..)
, PrepTable(..)
, SimpleGlyphDefinition(..)
, TableDirectory(..)
, TrueMaxpTable(..)
, UVSOffset(..)
, UVSMapping(..)
, UnicodeValueRange(..)
, VariationSelectorMap
, unLocaTable
) where
import Data.ByteString (ByteString)
import Data.Int (Int8, Int16)
import Data.IntMap (IntMap)
import Data.List.NonEmpty (NonEmpty(..))
import Data.Time (LocalTime(..))
import Data.Vector (Vector)
import Data.Word (Word8, Word16, Word32)
import Graphics.Fountainhead.Type (F2Dot14(..), Fixed32(..))
-- * Font directory
data FontDirectory = FontDirectory
{ offsetSubtable :: OffsetSubtable
, tableDirectory :: [TableDirectory]
} deriving (Eq, Show)
data OffsetSubtable = OffsetSubtable
{ scalerType :: Word32
, numTables :: Int
, searchRange :: Word16
, entrySelector :: Word16
, rangeShift :: Word16
} deriving (Eq, Show)
data TableDirectory = TableDirectory
{ tag :: ByteString
, checkSum :: Word32
, offset :: Int
, length :: Int
} deriving (Eq, Show)
-- * Name table
data NameTable = NameTable
{ format :: Word16 -- ^ Format selector. Set to 0.
, nameRecord :: [NameRecord] -- ^ The name records array.
, variable :: [ByteString] -- ^ The character strings of the names.
} deriving (Eq, Show)
data NameRecord = NameRecord
{ platformID :: Word16 -- ^ Platform identifier code.
, platformSpecificID :: Word16 -- ^ Platform-specific encoding identifier.
, languageID :: Word16 -- ^ Language identifier.
, nameID :: Word16 -- ^ Name identifier.
, length :: Int -- ^ Name string length in bytes.
, offset :: Int -- ^ Offset.
} deriving (Eq, Show)
-- * 'cvt ' table
newtype CVTable = CVTable [Int16]
deriving (Eq, Show)
-- * Maximum profile table
data TrueMaxpTable = TrueMaxpTable
{ version :: Fixed32 -- ^ 0x00010000 (1.0).
, numGlyphs :: Word16 -- ^ The number of glyphs in the font.
, maxPoints :: Word16 -- ^ Points in non-compound glyph.
, maxContours :: Word16 -- ^ Contours in non-compound glyph.
, maxComponentPoints :: Word16 -- ^ Points in compound glyph.
, maxComponentContours :: Word16 -- ^ Contours in compound glyph.
, maxZones :: Word16 -- ^ Set to 2.
, maxTwilightPoints :: Word16 -- ^ Points used in Twilight Zone (Z0).
, maxStorage :: Word16 -- ^ Number of Storage Area locations.
, maxFunctionDefs :: Word16 -- ^ Number of FDEFs.
, maxInstructionDefs :: Word16 -- ^ Number of IDEFs.
, maxStackElements :: Word16 -- ^ Maximum stack depth.
, maxSizeOfInstructions :: Word16 -- ^ Byte count for glyph instructions.
, maxComponentElements :: Word16 -- ^ Number of glyphs referenced at top level.
, maxComponentDepth :: Word16 -- ^ Levels of recursion, set to 0 if font has only simple glyphs.
} deriving (Eq, Show)
data OpenMaxpTable = OpenMaxpTable
{ version :: Fixed32 -- ^ 0x00005000 (0.5).
, numGlyphs :: Word16 -- ^ The number of glyphs in the font.
} deriving (Eq, Show)
data MaxpTable = OpenMaxp OpenMaxpTable | TrueMaxp TrueMaxpTable
deriving (Eq, Show)
-- * Horizontal header table
data HheaTable = HheaTable
{ version :: Fixed32 -- ^ 0x00010000 (1.0).
, ascent :: Int16 -- ^ Distance from baseline of highest ascender.
, descent :: Int16 -- ^ Distance from baseline of lowest descender.
, lineGap :: Int16 -- ^ Typographic line gap.
, advanceWidthMax :: Word16 -- ^ Must be consistent with horizontal metrics.
, minLeftSideBearing :: Word16 -- ^ Must be consistent with horizontal metrics.
, minRightSideBearing :: Word16 -- ^ Must be consistent with horizontal metrics.
, xMaxExtent :: Word16 -- ^ max(lsb + (xMax-xMin)).
, caretSlopeRise :: Int16 -- ^ used to calculate the slope of the caret (rise/run) set to 1 for vertical caret.
, caretSlopeRun :: Int16 -- ^ 0 for vertical.
, caretOffset :: Int16 -- ^ Set value to 0 for non-slanted fonts.
, metricDataFormat :: Int16 -- ^ 0 for current format.
, numOfLongHorMetrics :: Word16 -- ^ Number of advance widths in metrics table.
} deriving (Eq, Show)
-- * Font header table
data HeadTable = HeadTable
{ version :: Fixed32 -- ^ 0x00010000 if (version 1.0).
, fontRevision :: Fixed32 -- ^ Set by font manufacturer.
, checkSumAdjustment :: Word32 -- ^ To compute: set it to 0, calculate the checksum for the 'head' table and put it in the table directory, sum the entire font as a uint32_t, then store 0xB1B0AFBA - sum. (The checksum for the 'head' table will be wrong as a result. That is OK; do not reset it.)
, magicNumber :: Word32 -- ^ Set to 0x5F0F3CF5.
, flags :: Word16
, unitsPerEm :: Word16 -- ^ Range from 64 to 16384.
, created :: LocalTime -- ^ International date.
, modified :: LocalTime -- ^ International date.
, xMin :: Int16 -- ^ For all glyph bounding boxes.
, yMin :: Int16 -- ^ For all glyph bounding boxes.
, xMax :: Int16 -- ^ For all glyph bounding boxes.
, yMax :: Int16 -- ^ For all glyph bounding boxes.
, macStyle :: FontStyle
, lowestRecPPEM :: Word16 -- ^ Smallest readable size in pixels.
, fontDirectionHint :: FontDirectionHint -- ^ 0 Mixed directional glyphs.
, indexToLocFormat :: Word16 -- ^ 0 for short offsets, 1 for long.
, glyphDataFormat :: Word16 -- ^ 0 for current format.
} deriving (Eq, Show)
data FontStyle = FontStyle
{ bold :: Bool
, italic :: Bool
, underline :: Bool
, outline :: Bool
, shadow :: Bool
, condensed :: Bool
, extended :: Bool
} deriving (Eq, Show)
data FontDirectionHint
= MixedDirectionalGlyphs -- ^ 0. Mixed directional glyphs.
| StronglyLeftToRightGlyphs -- ^ 1. Only strongly left to right glyphs.
| LeftToRightGlyphsWithNeutrals -- ^ 2. Like 1 but also contains neutrals.
| StronglyRightToLeftGlyphs -- ^ -1. Only strongly right to left glyphs.
| RightToLeftGlyphsWithNeutrals -- ^ -2. Like -1 but also contains neutrals.
deriving (Eq, Show)
data LocaTable
= ShortLocaTable (Vector Word16)
| LongLocaTable (Vector Word32)
deriving (Eq, Show)
unLocaTable :: LocaTable -> Vector Word32
unLocaTable (LongLocaTable values) = values
unLocaTable (ShortLocaTable values) = (* 2) . fromIntegral <$> values
-- * Horizontal metrics table
data LongHorMetric = LongHorMetric
{ advanceWidth :: Word16
, leftSideBearing :: Int16
} deriving (Eq, Show)
data HmtxTable = HmtxTable
{ hMetrics :: NonEmpty LongHorMetric
, leftSideBearing :: [Int16]
} deriving (Eq, Show)
-- * Glyph name and PostScript font table
data PostHeader = PostHeader
{ format :: Fixed32 -- ^ Format of this table
, italicAngle :: Fixed32 -- ^ Italic angle in degrees
, underlinePosition :: Int16 -- ^ Underline position
, underlineThickness :: Int16 -- ^ Underline thickness
, isFixedPitch :: Word32 -- ^ Font is monospaced; set to 1 if the font is monospaced and 0 otherwise (N.B., to maintain compatibility with older versions of the TrueType spec, accept any non-zero value as meaning that the font is monospaced)
, minMemType42 :: Word32 -- ^ Minimum memory usage when a TrueType font is downloaded as a Type 42 font
, maxMemType42 :: Word32 -- ^ Maximum memory usage when a TrueType font is downloaded as a Type 42 font
, minMemType1 :: Word32 -- ^ Minimum memory usage when a TrueType font is downloaded as a Type 1 font
, maxMemType1 :: Word32 -- ^ Maximum memory usage when a TrueType font is downloaded as a Type 1 font
} deriving (Eq, Show)
data PostFormat2Table = PostFormat2Table
{ glyphNameIndex :: Vector Word16 -- ^ Ordinal number of this glyph in 'post' string tables. This is not an offset.
, names :: Vector ByteString
} deriving (Eq, Show)
data PostSubtable
= None
| PostFormat2 PostFormat2Table
| PostFormat25 (Vector Int8)
| PostFormat4 (Vector Word16)
deriving (Eq, Show)
data PostTable = PostTable
{ postHeader :: PostHeader
, postSubtable :: PostSubtable
} deriving (Eq, Show)
-- * Font program table
newtype FpgmTable = FpgmTable (Vector Word8)
deriving (Eq, Show)
-- * Prep table
newtype PrepTable = PrepTable (Vector Word8)
deriving (Eq, Show)
-- * Horizontal device metrics table
data HdmxTable = HdmxTable
{ format :: Int16 -- ^ Format version number.
, records :: [DeviceRecord]
} deriving (Eq, Show)
data DeviceRecord = DeviceRecord
{ pixelSize :: Word8 -- ^ Pixel size for following widths.
, maximumWidth :: Word8 -- ^ Maximum width.
, widths :: Vector Word8 -- ^ Widths.
} deriving (Eq, Show)
-- * Glyph outline table
data GlyphDescription = GlyphDescription
{ numberOfContours :: Int
, xMin :: Int16 -- ^ Minimum x for coordinate data.
, yMin :: Int16 -- ^ Minimum y for coordinate data.
, xMax :: Int16 -- ^ Maximum x for coordinate data.
, yMax :: Int16 -- ^ Maximum y for coordinate data.
, definition :: GlyphDefinition
} deriving (Eq, Show)
data GlyphArgument
= GlyphInt16Argument Int16
| GlyphWord16Argument Word16
| GlyphInt8Argument Int8
| GlyphWord8Argument Word8
deriving (Eq, Show)
data GlyphTransformationOption
= GlyphNoScale
| GlyphScale F2Dot14
| GlyphXyScale F2Dot14 F2Dot14
| Glyph2By2Scale F2Dot14 F2Dot14 F2Dot14 F2Dot14
deriving (Eq, Show)
data SimpleGlyphDefinition = SimpleGlyphDefinition
-- | Array of last points of each contour; n is the number of contours;
-- array entries are point indices.
{ endPtsOfContours :: Vector Word16
-- | Array of instructions for this glyph.
, instructions :: Vector Word8
-- | Array of coordinates; the first is relative to (0,0), others are
-- relative to previous point.
, coordinates :: Vector GlyphCoordinate
} deriving (Eq, Show)
data CompoundGlyphDefinition = CompoundGlyphDefinition
{ components :: Vector ComponentGlyphPartDescription
, instructions :: Vector Word8
} deriving (Eq, Show)
data GlyphDefinition
= SimpleGlyph SimpleGlyphDefinition
| CompoundGlyph CompoundGlyphDefinition
deriving (Eq, Show)
data ComponentGlyphFlags = ComponentGlyphFlags
{ roundXyToGrid :: Bool
, weHaveInstructions :: Bool
, useMyMetrics :: Bool
, overlapCompound :: Bool
} deriving (Eq, Show)
data GlyphCoordinate = GlyphCoordinate
{ coordinateX :: Int16
, coordinateY :: Int16
, onCurve :: Bool
} deriving (Eq, Show)
data ComponentGlyphPartDescription = ComponentGlyphPartDescription
{ flags :: ComponentGlyphFlags
, glyphIndex :: Word16
, argument1 :: GlyphArgument
, argument2 :: GlyphArgument
, transformationOption :: GlyphTransformationOption
} deriving (Eq, Show)
-- * Glyph outline table
data OutlineFlag = OutlineFlag
{ onCurve :: Bool
, xShortVector :: Bool
, yShortVector :: Bool
, thisXIsSame :: Bool
, thisYIsSame :: Bool
} deriving (Eq, Show)
newtype GlyfTable = GlyfTable (Vector GlyphDescription)
deriving (Eq, Show)
-- * Character to glyph mapping table
data CmapTable = CmapTable
{ version :: Word16 -- ^ Version number is zero.
-- | Encodings with an offset into subtables map.
, encodings :: [CmapEncoding]
-- ^ The key into the map is the offset in the 'CmapEncoding's.
, subtables :: IntMap CmapSubtable
} deriving (Eq, Show)
data CmapEncoding = CmapEncoding
{ platformID :: Word16 -- ^ Platform identifier
, platformSpecificID :: Word16 -- ^ Platform-specific encoding identifier.
, offset :: Word32 -- ^ Offst of the mapping table.
} deriving (Eq, Show)
data CmapFormat0Table = CmapFormat0Table
{ language :: Word16 -- ^ Language code.
, glyphIndexArray :: Vector Word8 -- ^ An array that maps character codes to glyph index values.
} deriving (Eq, Show)
data CmapFormat2Subheader = CmapFormat2Subheader
{ firstCode :: Word16
, entryCount :: Word16
, idDelta :: Int16
, idRangeOffset :: Word16
} deriving (Eq, Show)
data CmapFormat2Table = CmapFormat2Table
{ language :: Word16 -- ^ Language code.
, subHeaderKeys :: Vector Word16 -- ^ Array that maps high bytes to subHeaders: value is index * 8.
, subHeaders :: Vector CmapFormat2Subheader -- ^ Variable length array of subHeader structures.
, glyphIndexArray :: Vector Word16 -- ^ Variable length array containing subarrays.
} deriving (Eq, Show)
data CmapFormat4Table = CmapFormat4Table
{ language :: Word16 -- ^ Language code.
, searchRange :: Word16 -- ^ 2 * (2**FLOOR(log2(segCount))).
, entrySelector :: Word16 -- ^ log2(searchRange/2).
, rangeShift :: Word16 -- ^ (2 * segCount) - searchRange.
, endCode :: Vector Word16 -- ^ Ending character code for each segment, last = 0xFFFF.
, startCode :: Vector Word16 -- ^ Starting character code for each segment.
, idDelta :: Vector Word16 -- ^ Delta for all character codes in segment.
, idRangeOffset :: Vector Word16 -- ^ Offset in bytes to glyph indexArray, or 0.
, glyphIndexArray :: Vector Word16 -- ^ Glyph index array.
} deriving (Eq, Show)
data CmapFormat6Table = CmapFormat6Table
{ language :: Word16 -- ^ Language code.
, firstCode :: Word16 -- ^ First character code of subrange.
, glyphIndexArray :: Vector Word16 -- ^ Array of glyph index values for character codes in the range
} deriving (Eq, Show)
data CmapGroup = CmapGroup
-- | First character code in this group; note that if this group is for one
-- or more 16-bit character codes (which is determined from the is32 array),
-- this 32-bit value will have the high 16-bits set to zero.
{ startCharCode :: Word32
-- | Last character code in this group; same condition as listed above for
-- the startCharCode.
, endCharCode :: Word32
-- | Glyph index corresponding to the starting character code.
, startGlyphCode :: Word32
} deriving (Eq, Show)
data CmapFormat8Table = CmapFormat8Table
{ language :: Word32 -- ^ Language code.
-- | Tightly packed array of bits (8K bytes total) indicating whether the
-- particular 16-bit (index) value is the start of a 32-bit character code.
, is32 :: [Word8]
-- | Word32 Number of groupings which follow.
, groups :: Vector CmapGroup
} deriving (Eq, Show)
data CmapFormat10Table = CmapFormat10Table
{ language :: Word32 -- ^ Language code.
, startCharCode :: Word32 -- ^ First character code covered.
, numChars :: Word32 -- ^ Number of character codes covered.
, glyphs :: Vector Word16 -- ^ Array of glyph indices for the character codes covered.
} deriving (Eq, Show)
data CmapFormat12Table = CmapFormat12Table
{ language :: Word32 -- ^ Language code.
, groups :: Vector CmapGroup
} deriving (Eq, Show)
type CmapFormat13Table = CmapFormat12Table
newtype CmapFormat14Table = CmapFormat14Table
{ varSelectorRecords :: VariationSelectorMap
} deriving (Eq, Show)
data CmapSubtable
= CmapFormat0 CmapFormat0Table
| CmapFormat2 CmapFormat2Table
| CmapFormat4 CmapFormat4Table
| CmapFormat6 CmapFormat6Table
| CmapFormat8 CmapFormat8Table
| CmapFormat10 CmapFormat10Table
| CmapFormat12 CmapFormat12Table
| CmapFormat13 CmapFormat13Table
| CmapFormat14 CmapFormat14Table
deriving (Eq, Show)
data UVSOffset a b = DefaultUVSOffset Word32 a | NonDefaultUVSOffset Word32 b
deriving (Eq, Show)
data UVSMapping = UVSMapping
{ unicodeValue :: Word32 -- ^ Base Unicode value of the UVS.
, glyphID :: Word16 -- ^ Glyph ID of the UVS.
} deriving (Eq, Show)
data UnicodeValueRange = UnicodeValueRange
{ startUnicodeValue :: Word32 -- ^ First value in this range.
, additionalCount :: Word8 -- ^ Number of additional values in this range.
} deriving (Eq, Show)
-- | Mapping from variation selector record offsets to the record data.
type VariationSelectorMap = IntMap
(NonEmpty (UVSOffset (Vector UnicodeValueRange) (Vector UVSMapping)))
-- * OS/2 table
data Os2Table
= Os2Version0 Os2BaseFields (Maybe Os2MicrosoftFields)
| Os2Version1 Os2BaseFields Os2MicrosoftFields Os2Version1Fields
| Os2Version2 Os2BaseFields Os2MicrosoftFields Os2Version4Fields
| Os2Version3 Os2BaseFields Os2MicrosoftFields Os2Version4Fields
| Os2Version4 Os2BaseFields Os2MicrosoftFields Os2Version4Fields
| Os2Version5 Os2BaseFields Os2MicrosoftFields Os2Version5Fields
deriving (Eq, Show)
data Os2Version1Fields = Os2Version1Fields
{ ulCodePageRange1 :: Word32
, ulCodePageRange2 :: Word32
} deriving (Eq, Show)
data Os2MicrosoftFields = Os2MicrosoftFields
{ sTypoAscender :: Int16
, sTypoDescender :: Int16
, sTypoLineGap :: Int16
, usWinAscent :: Word16
, usWinDescent :: Word16
} deriving (Eq, Show)
data Os2Version4Fields = Os2Version4Fields
{ ulCodePageRange1 :: Word32
, ulCodePageRange2 :: Word32
, sxHeight :: Int16
, sCapHeight :: Int16
, usDefaultChar :: Word16
, usBreakChar :: Word16
, usMaxContext :: Word16
} deriving (Eq, Show)
data Os2Version5Fields = Os2Version5Fields
{ ulCodePageRange1 :: Word32
, ulCodePageRange2 :: Word32
, sxHeight :: Int16
, sCapHeight :: Int16
, usDefaultChar :: Word16
, usBreakChar :: Word16
, usMaxContext :: Word16
, usLowerOpticalPointSize :: Word16
, usUpperOpticalPointSize :: Word16
} deriving (Eq, Show)
data Os2BaseFields = Os2BaseFields
{ version :: Word16 -- ^ Table version number (set to 0).
-- | Average weighted advance width of lower case letters and space.
, xAvgCharWidth :: Int16
-- | Visual weight (degree of blackness or thickness) of stroke in glyphs.
, usWeightClass :: Word16
-- | Relative change from the normal aspect ratio (width to height ratio)
-- as specified by a font designer for the glyphs in the font.
, usWidthClass :: Word16
-- | Characteristics and properties of this font (set undefined bits to
-- zero).
, fsType :: Int16
-- | Recommended horizontal size in pixels for subscripts.
, ySubscriptXSize :: Int16
-- | Recommended vertical size in pixels for subscripts.
, ySubscriptYSize :: Int16
-- | Recommended horizontal offset for subscripts.
, ySubscriptXOffset :: Int16
-- | Recommended vertical offset form the baseline for subscripts.
, ySubscriptYOffset :: Int16
-- | Recommended horizontal size in pixels for superscripts.
, ySuperscriptXSize :: Int16
-- | Recommended vertical size in pixels for superscripts.
, ySuperscriptYSize :: Int16
-- | Recommended horizontal offset for superscripts.
, ySuperscriptXOffset :: Int16
-- | Recommended vertical offset from the baseline for superscripts.
, ySuperscriptYOffset :: Int16
-- | Width of the strikeout stroke.
, yStrikeoutSize :: Int16
-- | Position of the strikeout stroke relative to the baseline.
, yStrikeoutPosition :: Int16
-- ^ Classification of font-family design.
, sFamilyClass :: Int16
-- | 10 byte series of number used to describe the visual characteristics
-- of a given typeface.
, panose :: Panose
-- | Field is split into two bit fields of 96 and 36 bits each. The low 96
-- bits are used to specify the Unicode blocks encompassed by the font file.
-- The high 32 bits are used to specify the character or script sets covered
-- by the font file. Bit assignments are pending. Set to 0.
, ulUnicodeRange :: Vector Word32
-- | Four character identifier for the font vendor.
, achVendID :: Vector Int8
-- | 2-byte bit field containing information concerning the nature of the
-- font patterns.
, fsSelection :: Word16
-- | The minimum Unicode index in this font.
, fsFirstCharIndex :: Word16
-- | The maximum Unicode index in this font.
, fsLastCharIndex :: Word16
} deriving (Eq, Show)
data Panose = Panose
{ bFamilyType :: BFamilyType
, bSerifStyle :: BSerifStyle
, bWeight :: BWeight
, bProportion :: BProportion
, bContrast :: BContrast
, bStrokeVariation :: BStrokeVariation
, bArmStyle :: BArmStyle
, bLetterform :: BLetterform
, bMidline :: BMidline
, bXHeight :: BXHeight
} deriving (Eq, Show)
data BFamilyType
= AnyFamilyType
| NoFitFamilyType
| TextAndDisplayFamilyType
| ScriptFamilyType
| DecorativeFamilyType
| PictorialFamilyType
deriving (Eq, Show)
data BSerifStyle
= AnySerifStyle
| NoFitSerifStyle
| CoveSerifStyle
| ObtuseCoveSerifStyle
| SquareCoveSerifStyle
| ObtuseSquareCoveSerifStyle
| SquareSerifStyle
| ThinSerifStyle
| BoneSerifStyle
| ExaggeratedSerifStyle
| TriangleSerifStyle
| NormalSansSerifStyle
| ObtuseSansSerifStyle
| PerpSansSerifStyle
| FlaredSerifStyle
| RoundedSerifStyle
deriving (Eq, Show)
data BWeight
= AnyWeight
| NoFitWeight
| VeryLightWeight
| LightWeight
| ThinWeight
| BookWeight
| MediumWeight
| DemiWeight
| BoldWeight
| HeavyWeight
| BlackWeight
| NordWeight
deriving (Eq, Show)
data BProportion
= AnyProportion
| NoFitProportion
| OldStyleProportion
| ModernProportion
| EvenWidthProportion
| ExpandedProportion
| CondensedProportion
| VeryExpandedProportion
| VeryCondensedProportion
| MonospacedProportion
deriving (Eq, Show)
data BContrast
= AnyContrast
| NoFitContrast
| NoneContrast
| VeryLowContrast
| LowContrast
| MediumLowContrast
| MediumContrast
| MediumHighContrast
| HighContrast
| VeryHighContrast
deriving (Eq, Show)
data BStrokeVariation
= AnyStrokeVariatoon
| NoFitStrokeVariatoon
| GradualDiagonalStrokeVariatoon
| GradualTransitionalStrokeVariatoon
| GradualVerticalStrokeVariatoon
| GradualHorizontalStrokeVariatoon
| RapidVerticalStrokeVariatoon
| RapidHorizontalStrokeVariatoon
| InstantVerticalStrokeVariatoon
deriving (Eq, Show)
data BArmStyle
= AnyArmStyle
| NoFitArmStyle
| StraightArmsHorizontalArmStyle
| StraightArmsWedgeArmStyle
| StraightArmsVerticalArmStyle
| StraightArmsSingleSerifArmStyle
| StraightArmsDoubleSerifArmStyle
| NonStraightArmsHorizontalArmStyle
| NonStraightArmsWedgeArmStyle
| NonStraightArmsVerticalArmStyle
| NonStraightArmsSingleSerifArmStyle
| NonStraightArmsDoubleSerifArmStyle
deriving (Eq, Show)
data BLetterform
= AnyLetterform
| NoFitLetterform
| NormalContactLetterform
| NormalWeightedLetterform
| NormalBoxedLetterform
| NormalFlattenedLetterform
| NormalRoundedLetterform
| NormalOffCenterLetterform
| NormalSquareLetterform
| ObliqueContactLetterform
| ObliqueWeightedLetterform
| ObliqueBoxedLetterform
| ObliqueFlattenedLetterform
| ObliqueRoundedLetterform
| ObliqueOffCenterLetterform
| ObliqueSquareLetterform
deriving (Eq, Show)
data BMidline
= AnyMidline
| NoFitMidline
| StandardTrimmedMidline
| StandardPointedMidline
| StandardSerifedMidline
| HighTrimmedMidline
| HighPointedMidline
| HighSerifedMidline
| ConstantTrimmedMidline
| ConstantPointedMidline
| ConstantSerifedMidline
| LowTrimmedMidline
| LowPointedMidline
| LowSerifedMidline
deriving (Eq, Show)
data BXHeight
= AnyXHeight
| NoFitXHeight
| ConstantSmallXHeight
| ConstantStandardXHeight
| ConstantLargeXHeight
| DuckingSmallXHeight
| DuckingStandardXHeight
| DuckingLargeXHeight
deriving (Eq, Show)
-- * Kern table
data KernHeader = KernHeader
{ version :: Fixed32 -- ^ The version number of the kerning table (0x00010000 for the current version).
} deriving (Eq, Show)
data KernSubtableHeader = KernSubtableHeader
-- | The length of this subtable in bytes, including this header.
{ length :: Word32
-- | Circumstances under which this table is used.
, coverage :: [Coverage]
-- | The tuple index (used for variations fonts). This value specifies which
-- tuple this subtable covers.
, tupleIndex :: Word16
} deriving (Eq, Show)
data Coverage
= KernVertical -- ^ Set if table has vertical kerning values.
| KernCrossStream -- ^ Set if table has cross-stream kerning values.
| KernVariation -- ^ Set if table has variation kerning values.
| KernUnusedBits -- ^ Set to 0.
| KernFormatMask -- ^ Set the format of this subtable (0-3 currently defined).
deriving (Eq, Show)
data KernFormat0Pair = KernFormat0Pair
{ left :: Word16 -- ^ The glyph index for the lefthand glyph in the kerning pair.
, right :: Word16 -- ^ The glyph index for the righthand glyph in the kerning pair.
-- | The kerning value in FUnits for the left and right pair in FUnits.
-- If this value is greater than zero, the glyphs are moved apart.
-- If this value is less than zero, the glyphs are moved together.
, value :: Int16
} deriving (Eq, Show)
data KernFormat0Table = KernFormat0Table
{ nPairs :: Word16 -- ^ The number of kerning pairs in this subtable.
, searchRange :: Word16 -- ^ The largest power of two less than or equal to the value of nPairs, multiplied by the size in bytes of an entry in the subtable.
-- | This is calculated as log2 of the largest power of two less than or
-- equal to the value of nPairs. This value indicates how many iterations of
-- the search loop have to be made. For example, in a list of eight items,
-- there would be three iterations of the loop.
, entrySelector :: Word16
-- | The value of nPairs minus the largest power of two less than or equal
-- to nPairs. This is multiplied by the size in bytes of an entry in the
-- table.
, rangeShift :: Word16
, pairs :: [KernFormat0Pair]
} deriving (Eq, Show)

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-- | Generic font types.
module Graphics.Fountainhead.Type
( F2Dot14(..)
, Fixed32(..)
) where
import Data.Int (Int16)
import Data.Word (Word32)
newtype Fixed32 = Fixed32 Word32
deriving (Eq, Show)
newtype F2Dot14 = F2Dot14 Int16
deriving (Eq, Show)