diff options
Diffstat (limited to 'src/opengl')
| -rw-r--r-- | src/opengl/qglframebufferobject.cpp | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/opengl/qglframebufferobject.cpp b/src/opengl/qglframebufferobject.cpp index 49b28c36b9..4537f5bfae 100644 --- a/src/opengl/qglframebufferobject.cpp +++ b/src/opengl/qglframebufferobject.cpp @@ -1111,6 +1111,20 @@ QGLFramebufferObjectFormat QGLFramebufferObject::format() const Returns the contents of this framebuffer object as a QImage. + The returned image has a format of premultiplied ARGB32 or RGB32. The latter is used + only when internalTextureFormat() is set to \c GL_RGB. + + If the rendering in the framebuffer was not done with premultiplied alpha in mind, + create a wrapper QImage with a non-premultiplied format. This is necessary before + performing operations like QImage::save() because otherwise the image data would get + unpremultiplied, even though it was not premultiplied in the first place. To create + such a wrapper without performing a copy of the pixel data, do the following: + + \code + QImage fboImage(fbo.toImage()); + QImage image(fboImage.constBits(), fboImage.width(), fboImage.height(), QImage::Format_ARGB32); + \endcode + On QNX the back buffer is not preserved when a buffer swap occures. So this function might return old content. */ |