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@@ -1,3 +1,118 @@ +Overview of changes in 1.90 +=========================== + +This is an unstable development release leading towards +Pango 2.0, which will be major new version, and will not +be API or ABI compatible with Pango 1.x. + +The API changes in this release are not final, and feedback +on the changes and features in this release is very appreciated, +so we can fix up oversights and omissions before finalizing +the 2.0 API. + +This release is parallel-installable with Pango 1.50.x. + +Changes +------- + +Pango is now shipped as a single shared object, libpango-2.so, +which contains the high-level cross-platform code as well as +platform-specific fontmap implementations and the cairo +support (if it is enabled). + +Linking both libpango-1.so and libpango-2.so into the same +process is not supported, and we try to detect and prevent +this situation. + +Major new APIs +-------------- + +- PangoLineBreaker: + + PangoLineBreaker is the core of pango's line-breaking algorithm, + broken out from PangoLayout. Having this available independent + from PangoLayout will facilitate uses such as multi-column + layout, text flow between frames and shaping paragraphs around + images. + +- PangoLines + + PangoLines is the 'formatted output' part of a PangoLayout, and + can be used to collect the output of a PangoLineBreaker. + +- PangoFontMap + + The PangoFontMap class has seen some significant changes. It is + now possible to instantiate a PangoFontMap, and populate it manually + with PangoFontFamily and PangoFontFace objects. + + There are platform-specific subclasses + + - PangoFcFontMap + - PangoCoreTextFontMap + - PangoDirectWriteFontMap + + which will use platform API to enumerate fonts and populate + the fontmap. + +- PangoGenericFamily + + PangoGenericFamily is a new object representing generic font + families such as 'Sans' or 'Serif', which are populated with + lots of individual font families matching these general styles. + + When a PangoFontMap returns a fontset matching a query, it will + always include at least on PangoGenericFamily in the result, to + ensure good charset coverage. + + In the past, this was achieved by having the fontconfig fontmap + always return a fontset including *all* the system fonts, with + varying order. The new approach should be more performant on + systems with many fonts, where sorting all the fonts is expensive. + +- PangoHbFace, PangoHbFont + + The Pango font classes have been replaced by this pair of classes + which are thin wrappers around hb_face_t and hb_font_t. Since + HarfBuzz provides these cross-platform objects for us, we don't + need platform-specific font implementations anymore. + + As one of the advantages of the new font implementation it is + now possible to instantiate fonts from a font file, or from font + data in memory. + + The cairo support code has learned to generate cairo scaled + fonts from PangoHbFont objects. + +- PangoUserFont, PangoUserFace + + These are a new kind of callback-based font implementation to + allow for entirely application-defined font handling, including + glyph drawing. + +Other API changes +----------------- + +- PangoAttribute has been reimplemented + +- All deprecated APIs have been dropped + +- The PangoScript enumeration has been replaced by GUnicodeScript + +- PangoCoverage has been replaced by pango_font_face_has_char + +- PangoColor has gained an alpha field + +- The PangoFontsetSimple object is unused and has been dropped + +- PangoXft, PangoFT2 and other backend-specific rendering APIs + have been dropped for now + +- Most structs have been made private + +- Many smaller API cleanups and reductions + + Overview of changes in 1.50.7, 14-04-2022 ========================================= - coretext: Fix the build diff --git a/docs/first-steps.png b/docs/first-steps.png Binary files differnew file mode 100644 index 00000000..c5b5afc5 --- /dev/null +++ b/docs/first-steps.png |
