imgd | global avatar service that pulls head | Video Game library

To remove holes in the render scan each pixel you are rendering to and calculate where on that image that pixel is from.

There is a slight cost in that you end up scanning pixels that have no content however that can be resolved if you use a scanline polygon render

The example below creates an image, gets the pixels of the image and also creates a buffer to hold rendered pixels.

Rather than read and write pixels per channel, it creates a Uint32Array view of the buffers so all 4 pixel channels can be read and written in one operation.

Because the image is uniform the scan lines can be optimized such that the full transform need only be calculated once per row.

The scanline function takes 6 arguments. ox, oy The rotation origin, ang the rotation in radians, scale the scale to render the image, r32 Uint32Array view of image Data contains the image to draw. w32 Uint32Array view of image data to hold the resulting render.

It is reasonably performant, with the example rendering about 160,000 pixels per update.

Hazelcast IQueue does not support asynchronous interface. Anyway, asynchronous access would not be faster. MDB requires JMS, which is pure overhead. What you really need is multithreaded executor. You can use default executor:

You can use two different style with style inheritance -

The image you are using is 48/48. In order to get a 20/20 image on the canvas you need to do ctx.drawImage(image, 0, 0,20,20);

Also when you get the image data you don't do this: ctx.getImageData(0, 0, 45, 45),. Since you get the image data from a 20/20 canvas you do ctx.getImageData(0, 0, 20, 20)

I hope it helps.

According to the Qt documentation : Note that the returned value is always Qt::NoButton for mouse move events.

Use QMouseEvent::buttons(), instead:

The biggest problem here?
Your timer.

Let's remove everything related to the canvas and just try to log how many times per frame you are drawing this little time counter:

I'm not sure if you want to return only an image for the request or if you would like to be able to load several images from database during one request and display them?

I'll presume the latter since you say "I have to output the data in a page".

Looking at it quickly I see two routes you can go. If the binary data is a valid image and you know the type you could just save it into a file (perhaps in a temporary ramdisk to avoid writes on disk) and read from that file like normal. I would probably not go this route though since you already have the binary data in your database and saving it to another place indicates the design is wrong and a more correct scenario would have been to save the image on disk right away and store a reference to it in the database.

So, since the binary data is already in the database I would go with loading it directly into the image tag on your page using base64 encoding.

Pseudocode for this would be something like

To mix manually you would have to apply a different formula to mix foreground (new color) and background (image) to preserve anti-aliased pixels (and just in case: the image included in the question is not actually transparent, but I guess you just tried to illustrate transparency using the solid checkerboard background?).

I would suggest a different approach which is CORS safe and much faster (and simpler) -

There are a couple of ways to do this: one is to draw in the color you want, then set composite mode to destination-in and then draw the image, or draw the image, set composite mode to source-in and then draw the color.

I figure it out.

I didn't know that there is something called preflight request which is executed before real request to rest API. If preflight request fail it will not accept/receive more headers. This is why I didn't see it on real request in chrome console network tab but it was in config object which was console.loged in interceptor.

Same in repository demo which was calling not existing URL so preflight request failed there as well. While creating this demo I had no idea that such thing as preflight request exist so I was sure that it doesn't matter if I'll call some existing URL endpoint or fictitious one, I thought that in both way I should be able to see request header there.