From b17c13074c1fed76d90d329b4e923c95b772279b Mon Sep 17 00:00:00 2001
From: Matan Ziv-Av <matan@svgalib.org>
Date: Fri, 5 Aug 2022 14:38:40 +0300
Subject: [PATCH] Initialize sixel mode even when missing Raster attributes Ph
 and Pv

Use default Ph=8, Pv=6.
Without this, some sixel commands (ususally the color table
initialization) are not processed.
---
 src/Vt102Emulation.cpp | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/Vt102Emulation.cpp b/src/Vt102Emulation.cpp
index b5e4f401..1b14d89e 100644
--- a/src/Vt102Emulation.cpp
+++ b/src/Vt102Emulation.cpp
@@ -2950,7 +2950,7 @@ bool Vt102Emulation::processSixel(uint cc)
         }
         addArgument();
 
-        if (params.count == 4) {
+        if (params.count == 4 || params.count == 2) {
             // We just ignore the pixel aspect ratio, it's dumb
             // const int pixelWidth = params.value[0];
             // const int pixelHeight = params.value[1];
@@ -2961,8 +2961,16 @@ bool Vt102Emulation::processSixel(uint cc)
                 } else {
                     m_aspect = qMakePair(params.value[0], params.value[1]);
                 }
-                const int width = params.value[2];
-                const int height = params.value[3];
+                int width;
+                int height;
+                if (params.count == 4) {
+                    width = params.value[2];
+                    height = params.value[3];
+                } else {
+                    // Default size
+                    width = 8;
+                    height = 6;
+                }
                 SixelModeEnable(width, height);
             }
             resetTokenizer();