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Avoid possible deadlock

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6545

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https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6538

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6535

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6533

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https://github.com/ImageMagick/ImageMagick/issues/999

https://github.com/ImageMagick/ImageMagick/issues/998

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Revert "Revert "Fix previous image references in OptimizeImageLayers (#983)" (#984)" (#993)

Commit 91fd0ac1dda4e0d1109ac70080f55b5286b6abc5 can be safely reverted
because commit b5a7073da902c79264ef8d3ccc8dd715fed8222d has same effects
in terms of intermediate image dimensions.

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6271

https://github.com/ImageMagick/ImageMagick/issues

https://github.com/ImageMagick/ImageMagick/issues/991

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https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6498

https://github.com/ImageMagick/ImageMagick/issues/995

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https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6489

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6492

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https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6491

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6495

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6493

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6488

https://github.com/ImageMagick/ImageMagick/issues/996

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https://github.com/ImageMagick/ImageMagick/pull/990

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6462

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https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6462

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Assert image page dimension in OptimizeLayerFrames (#990)

OptimizeLayerFrames initializes the background with some assumptions for
image page dimension.

Do not refer to page in OptimizeLayerFrames (#987)

page dimension was used to create images to compare different disposal
methods. However, functions used for the comparisons, namely
CompareImagesBounds and IsBoundsCleared are based on the dimensions of
images themselves.

Creating image with page dimension is inefficient when converting images
with larger pages and therefore should be avoided.

Eliminate invalid montage directory exception

Whitespace

Fixed unitialized value

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https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6455

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Fix undefined behavior when calling isdigit (#989)

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https://github.com/ImageMagick/ImageMagick/issues/985

Also remove the ReadPixelMask.

Fixed clearing the clip_mask.

Whitespace

https://github.com/ImageMagick/ImageMagick/issues/982

Fix undefined behavior when calling isdigit (#988)

Fixed setting the clip mask in DrawClipPath.

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https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=33532

Fixed memory leak.

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6441

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5707

Removed check that we don't need in IM7.

Fixed memory leak.

https://mail.google.com/mail/#inbox/161a60451d18a7af

Improve exception handling

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6424

Support named strings

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6430

Fixed setting the initial value for pixels in the write mask for image that had no alpha channel.

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https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6425

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Default color should be transparent.

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https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6406

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6400

Removed calls to SetImageBackgroundColor.

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https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6385

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https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6350

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6308

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6307

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6235

Corrected patch for #967

Moved call to fix issue with setting the incorrect storage_class.

Revert "Fix previous image references in OptimizeImageLayers (#983)" (#984)

This reverts commit 79e2db21148e6aeb2aef5218728d70ca577d6a57.

Fix previous image references in OptimizeImageLayers (#983)

The code used CloneImage with columns and rows arguments to create
previous image references.

However, the documentation of CloneImage says:
> If the specified columns and rows is 0, an exact copy of the image is
> returned, otherwise the pixel data is undefined and must be initialized
> with the QueueAuthenticPixels() and SyncAuthenticPixels() methods.  On
> failure, a NULL image is returned and exception describes the reason for the
> failure.

Therfore, the pixel data given by such a statement was undefined, which is
not expected.

This alters those arguments to 0, or replaces CloneImage with
ReferenceImage if it is enough.

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6278

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6271

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6269

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6263

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https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6245