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Tweaks to glabels-3 text object compatability. (#306)

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This commit partially addresses issues in #296.  Due to the fact that glabels-3
and glabels-4 use different underlying technologies for rendering text, a
pixel-perfect import can probably never be fully achieved.

This commit focuses on small adjustments to imported text objects to approximate
the visual appearance of these objects.

- glabels-3 rendered text at 75% of stated font size, compensate by adjusting
  font size of imported object.
- Text boxes behave differently in glabels-4 than in glabels-3.  In glabels-4,
  text boxes must be of a fixed size, so compensate when a variable sized
  box (when w=0 and/or h=0) is detected and fix the size to the natural text
  size.
- In glabels-3, the fixed margin size (3pt) was not used in the text baseline
  calculations.  Compensate by adjusting vertical position of imported text
  object.
This commit is contained in:
Jaye Evins
2026-02-05 18:45:18 -05:00
committed by GitHub
parent 73d90c28f8
commit 993e1e460d
2 changed files with 44 additions and 20 deletions
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model/XmlLabelParser_3.cpp
+37 -17
View File
@@ -50,8 +50,12 @@
namespace
{
using namespace glabels::model;
const uint32_t GDK_PIXBUF_MAGIC_NUMBER {0x47646b50};
const double FONT_SCALE_FACTOR {0.75};
const double FONT_SCALE_FACTOR {0.75}; // In glabels-3, fonts were rendered at 75% of specified fontsize
const Distance MARGIN_OFFSET { Distance::pt(3) }; // In glabels-3, margin was not accounted for in text baseline calculations
typedef enum
{
@@ -463,35 +467,35 @@ namespace glabels::model
XmlLabelParser_3::parseObjectTextNode( const QDomElement &node )
{
/* position attrs */
const Distance x0 = XmlUtil::getLengthAttr( node, "x", 0.0 );
const Distance y0 = XmlUtil::getLengthAttr( node, "y", 0.0 );
Distance x0 = XmlUtil::getLengthAttr( node, "x", 0.0 );
Distance y0 = XmlUtil::getLengthAttr( node, "y", 0.0 );
/* size attrs */
const Distance w = XmlUtil::getLengthAttr( node, "w", 0 );
const Distance h = XmlUtil::getLengthAttr( node, "h", 0 );
Distance w = XmlUtil::getLengthAttr( node, "w", 0 );
Distance h = XmlUtil::getLengthAttr( node, "h", 0 );
/* justify attr */
const Qt::Alignment textHAlign = getHAlignmentAttr( node, "justify", Qt::AlignLeft );
Qt::Alignment textHAlign = getHAlignmentAttr( node, "justify", Qt::AlignLeft );
/* valign attr */
const Qt::Alignment textVAlign = getVAlignmentAttr( node, "valign", Qt::AlignTop );
Qt::Alignment textVAlign = getVAlignmentAttr( node, "valign", Qt::AlignTop );
/* auto_shrink attr */
const bool textAutoShrink = XmlUtil::getBoolAttr( node, "auto_shrink", false );
bool textAutoShrink = XmlUtil::getBoolAttr( node, "auto_shrink", false );
/* affine attrs */
const auto affineTransformation = parseAffineTransformation(node);
auto affineTransformation = parseAffineTransformation(node);
/* shadow attrs */
const bool shadowState = XmlUtil::getBoolAttr( node, "shadow", false );
const Distance shadowX = XmlUtil::getLengthAttr( node, "shadow_x", 0.0 );
const Distance shadowY = XmlUtil::getLengthAttr( node, "shadow_y", 0.0 );
const double shadowOpacity = XmlUtil::getDoubleAttr( node, "shadow_opacity", 1.0 );
bool shadowState = XmlUtil::getBoolAttr( node, "shadow", false );
Distance shadowX = XmlUtil::getLengthAttr( node, "shadow_x", 0.0 );
Distance shadowY = XmlUtil::getLengthAttr( node, "shadow_y", 0.0 );
double shadowOpacity = XmlUtil::getDoubleAttr( node, "shadow_opacity", 1.0 );
QString key = XmlUtil::getStringAttr( node, "shadow_color_field", "" );
bool field_flag = !key.isEmpty();
uint32_t color = XmlUtil::getUIntAttr( node, "shadow_color", 0 );
const ColorNode shadowColorNode( field_flag, color, key );
ColorNode shadowColorNode( field_flag, color, key );
/* font attrs */
QString fontFamily = "Sans";
@@ -576,6 +580,20 @@ namespace glabels::model
}
const QString text = document.toPlainText();
// Compensate for differences in glabels-3 text baseline calculations
switch ( textVAlign )
{
case Qt::AlignVCenter:
// No adjustment should be needed
break;
case Qt::AlignBottom:
y0 += MARGIN_OFFSET;
break;
default:
y0 -= MARGIN_OFFSET;
break;
}
auto textNode = new ModelTextObject( x0, y0, w, h, false /*lockAspectRatio*/, text,
fontFamily, fontSize, fontWeight, fontItalicFlag, false,
textColorNode, textHAlign, textVAlign, textWrapMode, textLineSpacing,
@@ -583,9 +601,11 @@ namespace glabels::model
affineTransformation,
shadowState, shadowX, shadowY, shadowOpacity, shadowColorNode );
// The size of the textnode does not fit the qt world. So it's needed to
// recalculate the size depending on the data.
textNode->setSize(textNode->naturalSize());
if ( (w.pt() == 0) || (h.pt() == 0) )
{
// Do our best to autosize
textNode->setSize(textNode->naturalSize());
}
return textNode;
}