support of tight bounding boxes for images or handling some glyphs wh…

[tjindal]

…ich crops in output

To provide output in a tight bound box by computing the bounds of image and then draw a canvas of bounds size.
This change is necessary for that svg files having viewbox values are small (width & height) as compare to image bounds (width & height)

initially by using default canvas, we compute bounds of image. Then by using same bounds draw the required canvas again and draw the image on new canvas. it will ensure our image will fits correctly into new canvas.

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Related Issue

Motivation and Context

How Has This Been Tested?

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.

• My code follows the code style of this project.

• My change requires a change to the documentation.

• I have updated the documentation accordingly.

• I have read the CONTRIBUTING document.

• I have added tests to cover my changes.

• All new and existing tests passed.