sc lok: Implement hi-dpi and zoom for spreadsheets.

A bit different approach than trying to paint different zoom levels at
the samet time, because it is terribly hard to achieve with Calc -
things misalign, because Calc tries to fit the lines into the pixels
etc.

Instead, always paint the spreadsheet at 100%, but use cairo to scale the
actual painting.

Change-Id: I228a9dd41bf29862bdd188825d12e61e1c86cccc
Reviewed-on: https://gerrit.libreoffice.org/63031
Tested-by: Jenkins
Reviewed-by: Jan Holesovsky <kendy@collabora.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/comphelper/source/misc/lok.cxx b/comphelper/source/misc/lok.cxx
index 0641e01660ab..2f6a2c151370 100644
--- a/comphelper/source/misc/lok.cxx
+++ b/comphelper/source/misc/lok.cxx
@@ -37,6 +37,9 @@ static bool g_bLocalRendering(false);
 
 static LanguageTag g_aLanguageTag("en-US", true);
 
+/// Scaling of the cairo canvas painting for hi-dpi or zooming in Calc.
+static double g_fDPIScale(1.0);
+
 void setActive(bool bActive)
 {
     g_bActive = bActive;
@@ -77,6 +80,16 @@ bool isDialogPainting()
     return g_bDialogPainting;
 }
 
+void setDPIScale(double fDPIScale)
+{
+    g_fDPIScale = fDPIScale;
+}
+
+double getDPIScale()
+{
+    return g_fDPIScale;
+}
+
 void setTiledAnnotations(bool bTiledAnnotations)
 {
     g_bTiledAnnotations = bTiledAnnotations;