I've implemented a screenshot function of NSView, UIView and GLKView.

[suzumura-ss]

Hi there.

I've implemented a screenshot function of NSView, UIView and GLKView.
NSOpenGLView does not support.

• In UIView#-(UIImage*)captureImage, make the image using the GLKView#-(UIImage*)snapshot method in the case of GLKView.
• I added a -(NSString*)captureBase64PngImage method to NSView and UIView. To FrankHelper, this sends a PNG image with the Base64 encoding.
• FrankHelper#capture(selector) returns to the test code with Base64 decode this data.

[moredip]

@MichaelBuckley can I get your opinion on this pull request since it's in your OS X world?

[ondrejhanslik]

@moredip This is not really OS X related - GLKView is an iOS class. I am pretty sure the code is working although some of the UIView / NSView category methods should get FEX_ prefix.

(I don't understand the need for sending base-64-encoded images back to ruby).

[MichaelBuckley]

@moredip I left a comment, but it otherwise looks good.

[MichaelBuckley]

Oh yeah, I agree with @ondrejhanslik. The category methods should be prefixed.

[moredip]

Yes, I'm a bit confused as to what the need is for the base64-encoded image. @suzumura-ss, can you explain?

I think it'd make more sense to separate out the GLKView support from the base64 stuff.

[suzumura-ss]

The reason I was Base64-encoded, I did not know how to generate a JSON object with PNG-binary in
MapOperationCommand#-(NSString*)handleCommandWithRequestBody: .

If ViewJSONSerializer#-(NSObject*)jsonify: can handle NSData, captureBase64PngImage can return PNG-binary directly.

GLKView support is extensible to UIView#-(UIImage*)captureImage.
So, for example, snapshot-all-view can capture GLKView.

And, I agree that to put a prefix.
Is it a FEX_ ?

[ondrejhanslik]

Also, instead of checking the availability of method snapshot on every UIView, this could be implemented as a GLKView+FrankImageCapture category.

 @implementation GKLView (ImageCapture)

 - (UIImage *)captureImage {
     return [self snapshot];
 }

I still don't like the Base-64 encoding. Maybe we could use the implementation that is already present in the ImageCaptureRoute?

"screenshot/snapshot-all-views" => will capture all the views
"screenshot/view-snapshot/UID" => will return the previously captured image for the view

def get_view_screenshot(view_selector)
    frank_server.send_get("screenshot/snapshot-all-views")
    view_uids = frankly_map(view_selector, "FEX_UID")

    screenshots = Array.new

    view_uids.each do |uid|
        path = "screenshot/view-snapshot/#{uid}"
        image_data = frank_server.send_get( path )

        screenshots.push(image_data)
    end

    screenshots
end

This supposes adding a method -[UIView FEX_UID] (the UID is already used by both dump and image-capture commands).

What do you think?

[suzumura-ss]

Why did not the category of GLKView call GLKView#snapshot, because I thought that to increase the framework depends is not good. However, this might be trivial.
Therefore, I agree to change the category of GLKView.

I also thought the idea to get UID.
However, snapshotAllViews method saves to temp all views.
By taking a snapshot several times, garbage is accumulated on the disk.
As an alternative, to provide a way to remove this garbage, is a good way, I think.

[moredip]

IIRC the snapshotAllViews method manages its own garbage - it clears out any old snapshots before it saves the new ones.

Cheers,

Pete

Typed on a little bitty keyboard

On Jul 3, 2013, at 5:00 AM, Toshiyuki Suzumura [email protected] wrote:

Why did not the category of GLKView call GLKView#snapshot, because I thought that to increase the framework depends is not good. However, this might be trivial.
Therefore, I agree to change the category of GLKView.

I also thought the idea to get UID.
However, snapshotAllViews method saves to temp all views.
By taking a snapshot several times, garbage is accumulated on the disk.
As an alternative, to provide a way to remove this garbage, is a good way, I think.

—
Reply to this email directly or view it on GitHub.

[suzumura-ss]

I made sure the matter of garbage. It was cleared.
I agree to use ImageCaptureRoute to capture views.

I tried to implement capture method with ImageCaptureRoute and FEX_UID.