tdf#144862 explore alternatives to writer's on-screen glyph positioning

writer does glyph position adjusting to try and split the difference of
the "printing" positions and "screen" positions.

it seems to have been there from the initial import

commit 84a3db80b4fd66c6854b3135b5f69b61fd828e62
Date:   Mon Sep 18 23:08:29 2000 +0000

initial import

we seem to sync with the printing positions after each whitespace so
each initial glyph after whitespace is a stable position and is the
'printing' position while each following glyph is in a position which is
somewhere between the 'printing' position and 'screen' position. Which
leads to noticeably unstable positions of text during editing at various
zoom levels and without a clear rationale for the heuristic.

GlyphPositioningMode::Classic, the original mode which remains the
default.

GlyphPositioningMode::PreferLayout, takes the vcl provided print
positions and just uses those unmodified for screen layout like editeng
does.

GlyphPositioningMode::ClassicInspired, which is similar to
GlyphPositioningMode::Classic in using 'printing' positions for the
start of runs, but using 'screen' positions for run content.

GlyphPositioningMode::PreferReadability, replace the 'printing'
positions with the screen-optimized positions for all content.

use tools, options, writer, view, glyph positioning to change

Change-Id: I6677af973268bc586d825c7fbf0b483aaf651ca0
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/127089
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/sw/inc/viewopt.hxx b/sw/inc/viewopt.hxx
index e8a1c299b496..6c93602a85ae 100644
--- a/sw/inc/viewopt.hxx
+++ b/sw/inc/viewopt.hxx
@@ -126,6 +126,13 @@ namespace o3tl {
     template<> struct typed_flags<ViewOptFlags> : is_typed_flags<ViewOptFlags, 0x01ff> {};
 }
 
+enum class GlyphPositioningMode {
+    Classic,
+    ClassicInspired,
+    PreferLayout,
+    PreferReadability
+};
+
 class SW_DLLPUBLIC SwViewOption
 {
     static Color    s_aDocColor;  // color of document boundaries
@@ -163,6 +170,7 @@ class SW_DLLPUBLIC SwViewOption
     sal_uInt8       m_nPagePreviewRow;       // Page Preview Row/Columns.
     sal_uInt8       m_nPagePreviewCol;       // Page Preview Row/Columns.
     SwFillMode      m_nShadowCursorFillMode;  // FillMode for ShadowCursor.
+    GlyphPositioningMode m_eGlyphPositioningMode; // Positioning strategy for screen glyphs
     bool            m_bReadonly : 1;      // Readonly-Doc.
     bool            m_bStarOneSetting : 1;// Prevent from UI automatics (no scrollbars in readonly documents).
     bool            m_bIsPagePreview : 1; // The preview mustn't print field/footnote/... shadings.
@@ -426,6 +434,12 @@ public:
     void SetPrinting(bool b)
         { SetCore2Option(b, ViewOptCoreFlags2::Printing); }
 
+    GlyphPositioningMode GetGlyphPositioningMode() const
+        { return m_eGlyphPositioningMode; }
+
+    void SetGlyphPositioningMode(GlyphPositioningMode eMode)
+        { m_eGlyphPositioningMode = eMode; }
+
     void SetCore2Option(bool b, ViewOptCoreFlags2 f)
     {
         if (b)
@@ -697,6 +711,7 @@ inline void SwViewOption::SetUIOptions( const SwViewOption& rVOpt )
     m_nUIOptions = rVOpt.m_nUIOptions;
     m_nTableDestination = rVOpt.m_nTableDestination;
     m_nShadowCursorFillMode = rVOpt.m_nShadowCursorFillMode;
+    m_eGlyphPositioningMode = rVOpt.m_eGlyphPositioningMode;
 }
 
 // Helper function for checking HTML-capabilities.