[Qt] Support IMAGE_DECODER_DOWN_SAMPLING flag

[Allan Sandfeld Jensen]

Currently the Qt platform does not work correctly with the IMAGE_DECODER_DOWN_SAMPLING flag set.

[Allan Sandfeld Jensen]

Created attachment 144784 [details]
Patch

[Kenneth Rohde Christiansen]

Comment on attachment 144784 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=144784&action=review

> Source/WebCore/platform/graphics/Image.cpp:173
> +    const IntSize origSize = size();

realSize?

> Source/WebCore/platform/graphics/Image.cpp:175
> +    // We assume down-sampling zoom rates in X direction and in Y direction are same.

Could we assert that assumption?

> Source/WebCore/platform/graphics/qt/ImageQt.cpp:250
> +    adjustSourceRectForDownSampling(wtfNormalizedSrc, wtfImageSize);

Impossible to see that these are out variables. Can we please use pointers

FloatRect newNormalizedSource(normalizedSrc);
adjustSourceRectForDownSampling(&newNormalizedSource, IntSize(image->size());
normalizedSrc = QRectF(newNormalizedSource);

[Allan Sandfeld Jensen]

(In reply to comment #2)
> (From update of attachment 144784 [details])
> View in context: https://bugs.webkit.org/attachment.cgi?id=144784&action=review
> 
> > Source/WebCore/platform/graphics/Image.cpp:173
> > +    const IntSize origSize = size();
> 
> realSize?
> 
> > Source/WebCore/platform/graphics/Image.cpp:175
> > +    // We assume down-sampling zoom rates in X direction and in Y direction are same.
> 
> Could we assert that assumption?
> 
> > Source/WebCore/platform/graphics/qt/ImageQt.cpp:250
> > +    adjustSourceRectForDownSampling(wtfNormalizedSrc, wtfImageSize);
> 
> Impossible to see that these are out variables. Can we please use pointers
> 

The entire function is moved from ImageOpenVG.cpp and only slightly modified, but I guess that shouldn't stop me from making it prettier. Not sure about realSize though, I might as well argue that the scaledSize is the real size.

[Allan Sandfeld Jensen]

Created attachment 144819 [details]
Patch

[WebKit Review Bot]

Comment on attachment 144819 [details]
Patch

Clearing flags on attachment: 144819

Committed r118947: <http://trac.webkit.org/changeset/118947>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.