From 95a189a3be787687113b14d66b607716dd642c8a Mon Sep 17 00:00:00 2001
From: Jaakko Keränen <jaakko.keranen@iki.fi>
Date: Thu, 15 Jul 2021 12:50:15 +0300
Subject: GmDocument: Right-align RTL decorations

---
 src/gmdocument.c | 35 ++++++++++++++++++++++++++---------
 src/ui/text.c    |  4 +---
 src/ui/text.h    |  1 +
 3 files changed, 28 insertions(+), 12 deletions(-)

(limited to 'src')

diff --git a/src/gmdocument.c b/src/gmdocument.c
index 639ddbfb..5034373d 100644
--- a/src/gmdocument.c
+++ b/src/gmdocument.c
@@ -822,16 +822,33 @@ static void doLayout_GmDocument_(iGmDocument *d) {
             }
             for (;;) { /* may need to retry */
                 rts.run.flags |= startOfLine_GmRunFlag;
-                measure_WrapText(&(iWrapText){ .text     = line,
-                                               .maxWidth = rts.isWordWrapped
-                                                               ? d->size.x - run.bounds.pos.x -
-                                                                     rts.indent - rts.rightMargin
-                                                               : 0 /* unlimited */,
-                                               .mode     = word_WrapTextMode,
-                                               .wrapFunc = typesetOneLine_RunTypesetter_,
-                                               .context  = &rts },
-                                 rts.run.textParams.font);
+                iWrapText wrapText = { .text     = line,
+                                       .maxWidth = rts.isWordWrapped
+                                                       ? d->size.x - run.bounds.pos.x -
+                                                             rts.indent - rts.rightMargin
+                                                       : 0 /* unlimited */,
+                                       .mode     = word_WrapTextMode,
+                                       .wrapFunc = typesetOneLine_RunTypesetter_,
+                                       .context  = &rts };
+                measure_WrapText(&wrapText, rts.run.textParams.font);
                 if (!isLedeParagraph || size_Array(&rts.layout) <= maxLedeLines_) {
+                    if (wrapText.baseDir < 0) {
+                        /* Right-aligned paragraphs need margins and decorations to be flipped. */
+                        iForEach(Array, pr, &rts.layout) {
+                            iGmRun *prun = pr.value;
+                            const int offset = rts.rightMargin - rts.indent;
+                            prun->bounds.pos.x    += offset;
+                            prun->visBounds.pos.x += offset;                            
+                        }
+                        if (type == bullet_GmLineType || type == link_GmLineType ||
+                            type == quote_GmLineType) {
+                            iGmRun *decor = back_Array(&d->layout);
+                            iAssert(decor->flags & decoration_GmRunFlag);
+                            decor->visBounds.pos.x = d->size.x - width_Rect(decor->visBounds) -
+                                                     decor->visBounds.pos.x + gap_Text *
+                                                     (type == bullet_GmLineType ? 1.5f : 1);
+                        }
+                    }
                     commit_RunTypesetter_(&rts, d);
                     break;
                 }
diff --git a/src/ui/text.c b/src/ui/text.c
index 01a9d606..0a3b7b2e 100644
--- a/src/ui/text.c
+++ b/src/ui/text.c
@@ -1382,9 +1382,6 @@ static iRect run_Font_(iFont *d, const iRunArgs *args) {
     float        xCursorMax = 0.0f;
     const iBool  isMonospaced = d->isMonospaced;
     iAssert(args->text.end >= args->text.start);
-//    if (args->continueFrom_out) {
-//        *args->continueFrom_out = args->text.end;
-//    }
     /* Split the text into a number of attributed runs that specify exactly which
        font is used and other attributes such as color. (HarfBuzz shaping is done
        with one specific font.) */
@@ -1392,6 +1389,7 @@ static iRect run_Font_(iFont *d, const iRunArgs *args) {
     init_AttributedText(&attrText, args->text, args->maxLen, d, get_Color(args->color),
                         args->baseDir);
     if (args->wrap) {
+        args->wrap->baseDir = attrText.isBaseRTL ? -1 : +1;
         /* TODO: Duplicated args? */
         iAssert(equalRange_Rangecc(args->wrap->text, args->text));
         /* Initialize the wrap range. */
diff --git a/src/ui/text.h b/src/ui/text.h
index d3a9f844..41e7671e 100644
--- a/src/ui/text.h
+++ b/src/ui/text.h
@@ -207,6 +207,7 @@ struct Impl_WrapText {
     enum iWrapTextMode mode;
     iBool  (*wrapFunc)(iWrapText *, iRangecc wrappedText, int origin, int advance, iBool isBaseRTL);
     void *   context;
+    int      baseDir; /* set to +1 for LTR, -1 for RTL
     /* internal */
     iRangecc wrapRange_;
 };
-- 
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