On 2016-02-25 11:58, Scott Rossi wrote:
Thanks for the explanation Mark. The discrepancy in resolution is
intensified in the simulator when a bitmap is displayed near text
content, which remains sharp at any size. So when one sets the
simulator to 100% scale and sees perfectly rendered 2cm text
characters drawn alongside a fuzzy mess of a bitmap, I think many
would be of the opinion (flawed as it is) that something is amiss. :-)
I do think this is just a 'visual artifact' - remember that when you
scale down an image it will be filtered (if the resizeQuality is at
least good) - so in the iPhone simulator you will more clearly see the
slight blurring that occurs as a result of this as you are seeing it at
twice the size.
I've just confirmed the engine is doing things correctly:
on mouseUp
local tImageData
repeat with i = 1 to 64
put numToByte(0) after tImageData
put numToByte(0) after tImageData
put numToByte(0) after tImageData
if (i mod 2) is 0 then
put numToByte(0) after tImageData
else
put numToByte(255) after tImageData
end if
end repeat
set the width of image 1 to 8
set the height of image 1 to 8
set the imageData of image 1 to tImageData
set the width of image 1 to 4
set the height of image 1 to 4
end mouseUp
Creates a small image on a stack whose image data is 8x8 but which is
rendered at 4x4. The image is 8 vertical lines, each 1 pixel wide which
alternates between black and blue.
On my non-Retina iMac, zooming the desktop in, the image is 4x4 solid
dark blue - because it is downscaling by a factor of two, each pixel
will be an average of 4 pixels - 50% black, 50% blue which is 50% blue
(0,0,127 or thereabouts).
When I run the stack on a Retina iPhone simulator, I see all 64 pixels
faithfully represented as I would expect since the simulated Retina
screen uses two screen pixels for every logical pixel.
i.e. In other words, the engine will use as many device pixels as it has
to render things (images are scaled from the original source size direct
to the screen - and not via the number of logical pixels).
Warmest Regards,
Mark.
--
Mark Waddingham ~ m...@livecode.com ~ http://www.livecode.com/
LiveCode: Everyone can create apps
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