image lib & Qt4

[Fredrik Lundh]

K.S.Sreeram wrote:

> I was hacking the code trying to support RGBA mode images, and
> inadvertently i tried im.tostring("raw","BGRX") on the RGBA mode image.
> 
> So BGRX does indeed work for RGB mode images.
> 
> While trying to support RGBA mode images, i realized that a BGRA raw
> mode is needed for working with QImage. It doesn't seem to be supported
> by PIL. Any workarounds?

sure!  here's a patch:

Index: ImageQt.py
===================================================================
--- ImageQt.py  (revision 342)
+++ ImageQt.py  (working copy)
@@ -58,6 +61,14 @@
          elif im.mode == "RGB":
              data = im.tostring("raw", "BGRX")
              format = QImage.Format_RGB32
+        elif im.mode == "RGBA":
+            try:
+                data = im.tostring("raw", "BGRA")
+            except SystemError:
+                # workaround for earlier versions
+                r, g, b, a = im.split()
+                im = Image.merge("RGBA", (b, g, r, a))
+            format = QImage.Format_ARGB32
          else:
              raise ValueError("unsupported image mode %r" % im.mode)

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