Fixed no-quality-loss-when-scaling-images patch for Qt 6.2.12 on macOS.

Author: 23rd

qtbase_6.2.12/0025-no-quality-loss-when-scaling-images.patch

@@ -1,22 +1,44 @@
 diff --git a/src/gui/image/qimage.cpp b/src/gui/image/qimage.cpp
-index c1eb41a65d..be52c7adf1 100644
+index c0a8947e71e..6653484c931 100644
 --- a/src/gui/image/qimage.cpp
 +++ b/src/gui/image/qimage.cpp
-@@ -4837,13 +4837,13 @@ QImage QImage::transformed(const QTransform &matrix, Qt::TransformationMode mode
+@@ -4834,25 +4834,26 @@ QImage QImage::transformed(const QTransform &matrix, Qt::TransformationMode mode
+             || (ws * hs) >= (1<<20)
  #endif
              ) {
+-            QImage scaledImage;
++            // Patch: no quality loss when scaling images.
++            // QImage scaledImage;
              if (mat.m11() < 0.0F && mat.m22() < 0.0F) { // horizontal/vertical flip
--                return smoothScaled(wd, hd).mirrored(true, true).convertToFormat(format());
+-                scaledImage = smoothScaled(wd, hd).mirrored(true, true);
 +                return smoothScaled(wd, hd).mirrored(true, true);
              } else if (mat.m11() < 0.0F) { // horizontal flip
--                return smoothScaled(wd, hd).mirrored(true, false).convertToFormat(format());
+-                scaledImage = smoothScaled(wd, hd).mirrored(true, false);
 +                return smoothScaled(wd, hd).mirrored(true, false);
              } else if (mat.m22() < 0.0F) { // vertical flip
--                return smoothScaled(wd, hd).mirrored(false, true).convertToFormat(format());
+-                scaledImage = smoothScaled(wd, hd).mirrored(false, true);
 +                return smoothScaled(wd, hd).mirrored(false, true);
              } else { // no flipping
--                return smoothScaled(wd, hd).convertToFormat(format());
+-                scaledImage = smoothScaled(wd, hd);
 +                return smoothScaled(wd, hd);
              }
+ 
+-            switch (format()) {
+-            case QImage::Format_Mono:
+-            case QImage::Format_MonoLSB:
+-            case QImage::Format_Indexed8:
+-                return scaledImage;
+-            default:
+-                return scaledImage.convertToFormat(format());
+-            }
++            // switch (format()) {
++            // case QImage::Format_Mono:
++            // case QImage::Format_MonoLSB:
++            // case QImage::Format_Indexed8:
++            //     return scaledImage;
++            // default:
++            //     return scaledImage.convertToFormat(format());
++            // }
          }
      }
+