I'm not sure, it might depend on a variety of factors. I know Java ImageIO can
use disk-backed caching, but that's just for manufacturing the BufferedImage
and so I don't know if it's disk-backed-ness carries over into the
BufferedImage it produces.
I don't handle DPI -- I create a BufferedImage of mostly the same properties
and do a pixel-pixel rescale. I suspect the DPI would only come into play when
you need to write it to disk with an image format that supports DPI, however I
surely don't know.
-Ross
On Jan 19, 2010, at 4:09 PM, Naftoli Gugenheim wrote:
> Does JAI need everything in RAM?
> Also, how do you deal with DPI?
>
> -------------------------------------
> Ross Mellgren<dri...@gmail.com> wrote:
>
> Well, it has to keep the whole source (packed) in memory and the target
> (unpacked / 32 bit RGBA) in memory, so I would assume that as long as
> AffineTransformOp is not doing something untoward it's probably around (src
> width * src height * src bytes/pixel) + (dest width * dest height * 4 bytes)
> plus a little bit extra.
>
> I'm not a Java2D guru or anything, so I'm not sure how that could be improved
> offhand.
>
> If you want to wrap it up and put it in, that'd be awesome!
>
> -Ross
>
> On Jan 15, 2010, at 10:17 AM, Timothy Perrett wrote:
>
>> Cool stuff Ross, whats the overhead like in terms of memory etc?
>>
>> I might have a bit of time to put this into a module and stuff it on review
>> board.
>>
>> Cheers, Tim
>>
>> On 15 Jan 2010, at 15:03, Ross Mellgren wrote:
>>
>>> According to Jon on the call, he said he was putting together just such a
>>> lift module (for image stuff), so I figured I'd toss this over in case it
>>> was of use to him in that module.
>>>
>>> If anyone else wants to use it independently, consider it a contribution to
>>> lift, and licensed the same way.
>>>
>>> -Ross
>>>
>>> On Jan 15, 2010, at 9:51 AM, Peter Robinett wrote:
>>>
>>>> Ross, this looks nice. Imagine resizing code is something that I've
>>>> personally had to do many times and is always annoying, so perhaps
>>>> this would make a good Lift module? Anyway, this is probably best
>>>> discussed on the main list...
>>>>
>>>> Peter
>>>>
>>>> On Jan 14, 3:01 am, Ross Mellgren <dri...@gmail.com> wrote:
>>>>> Oh I nearly forgot I said on the conference call the other day that I'd
>>>>> send the image resize code we built at work, in case it would be helpful.
>>>>> Here it is:
>>>>>
>>>>> import java.awt.{Graphics, RenderingHints, Transparency}
>>>>> import java.awt.geom.AffineTransform
>>>>> import java.awt.image.{AffineTransformOp, BufferedImage, ColorModel,
>>>>> IndexColorModel}
>>>>>
>>>>> /**
>>>>> * Helpers for manipulating images
>>>>> */
>>>>> object ImageHelpers
>>>>> {
>>>>> // Some code here omitted -- Ed.
>>>>>
>>>>> /** Rendering hints set up for the highest quality rendering */
>>>>> val highQualityHints = {
>>>>> val h = new RenderingHints(null)
>>>>> h.put(RenderingHints.KEY_ALPHA_INTERPOLATION,
>>>>> RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY)
>>>>> h.put(RenderingHints.KEY_COLOR_RENDERING,
>>>>> RenderingHints.VALUE_COLOR_RENDER_QUALITY)
>>>>> h.put(RenderingHints.KEY_INTERPOLATION,
>>>>> RenderingHints.VALUE_INTERPOLATION_BICUBIC)
>>>>> h.put(RenderingHints.KEY_ANTIALIASING,
>>>>> RenderingHints.VALUE_ANTIALIAS_ON)
>>>>> h.put(RenderingHints.KEY_RENDERING,
>>>>> RenderingHints.VALUE_RENDER_QUALITY)
>>>>> h
>>>>> }
>>>>>
>>>>> // Some code here omitted -- Ed.
>>>>>
>>>>> /**
>>>>> * Resize an image of the given source type by the given ratios,
>>>>> properly handling GIF transparency, giving back the resized
>>>>> * image and the new image format type that should be used.
>>>>> *
>>>>> * The image type might change if the input type is an indexed color
>>>>> model, because it is a hard problem to choose an optimized
>>>>> * palette, and currently we don't. This function will return "png" as
>>>>> the new type in this case.
>>>>> *
>>>>> * If the input image is not using an indexed color model with
>>>>> transparency, then the target format and color model will be
>>>>> * identical to the source.
>>>>> */
>>>>> def resize(source: BufferedImage, inputFormat: String, dx: Double, dy:
>>>>> Double): (BufferedImage, String) = {
>>>>> var sourceColorModel = source.getColorModel
>>>>> val targetColorModel = source.getColorModel
>>>>> val standardColorModel = ColorModel.getRGBdefault
>>>>>
>>>>> val (targetWidth, targetHeight) = (((source.getWidth: Double) *
>>>>> dx).asInstanceOf[Int], ((source.getHeight: Double) *
>>>>> dy).asInstanceOf[Int])
>>>>>
>>>>> def resize(src: BufferedImage, dst: BufferedImage) {
>>>>> val g = dst.createGraphics
>>>>> try {
>>>>> g.setRenderingHints(highQualityHints)
>>>>> g.drawImage(src, new
>>>>> AffineTransformOp(AffineTransform.getScaleInstance(dx, dy),
>>>>> AffineTransformOp.TYPE_BICUBIC), 0, 0)
>>>>> } finally {
>>>>> g.dispose
>>>>> }
>>>>> }
>>>>>
>>>>> // GIF support in Java is very ornery. For GIFs we have to manually
>>>>> do the masking on input, and then just punt on outputting GIFs and
>>>>> instead output PNGs.
>>>>> if (sourceColorModel.isInstanceOf[IndexColorModel] &&
>>>>> sourceColorModel.hasAlpha &&
>>>>> sourceColorModel.getTransparency == Transparency.BITMASK &&
>>>>>
>>>>> sourceColorModel.asInstanceOf[IndexColorModel].getTransparentPixel >= 0) {
>>>>>
>>>>> val indexColorModel =
>>>>> sourceColorModel.asInstanceOf[IndexColorModel]
>>>>> val transparent =
>>>>> indexColorModel.getRGB(indexColorModel.getTransparentPixel)
>>>>>
>>>>> val masked = new BufferedImage(standardColorModel,
>>>>> standardColorModel.createCompatibleWritableRaster(source.getWidth,
>>>>> source.getHeight), standardColorModel.isAlphaPremultiplied, null)
>>>>> var w = masked.getWidth
>>>>> var h = masked.getHeight
>>>>>
>>>>> val buf = new Array[Int](w)
>>>>>
>>>>> var y = 0
>>>>> while (y < h) {
>>>>> source.getRGB(0, y, w, 1, buf, 0, 1)
>>>>>
>>>>> var x = 0
>>>>> while (x < w) {
>>>>> val c = buf(x)
>>>>> if (c == transparent) {
>>>>> buf(x) = 0
>>>>> }
>>>>> x += 1
>>>>> }
>>>>>
>>>>> masked.setRGB(0, y, w, 1, buf, 0, 1)
>>>>> y += 1
>>>>> }
>>>>>
>>>>> val resized = new BufferedImage(standardColorModel,
>>>>> standardColorModel.createCompatibleWritableRaster(targetWidth,
>>>>> targetHeight), standardColorModel.isAlphaPremultiplied, null)
>>>>> resize(masked, resized)
>>>>> (resized, "png")
>>>>> } else if (sourceColorModel.isInstanceOf[IndexColorModel]) {
>>>>> // The input color model is indexed, and we know we won't be
>>>>> able to generate a tolerable palette to make another indexed color model,
>>>>> so use sRGB and upgrade to PNG.
>>>>> val resized = new BufferedImage(standardColorModel,
>>>>> standardColorModel.createCompatibleWritableRaster(targetWidth,
>>>>> targetHeight), standardColorModel.isAlphaPremultiplied, null)
>>>>> resize(source, resized)
>>>>> (resized, "png")
>>>>> } else {
>>>>> val resized = new BufferedImage(targetColorModel,
>>>>> targetColorModel.createCompatibleWritableRaster(targetWidth,
>>>>> targetHeight), targetColorModel.isAlphaPremultiplied, null)
>>>>> resize(source, resized)
>>>>> (resized, inputFormat)
>>>>> }
>>>>> }
>>>>>
>>>>> }
>>>>>
>>>>> It isn't perhaps the ideal implementation, as mentioned in some of the
>>>>> comments, but perhaps Jon or others might find it useful in whole or part.
>>>>>
>>>>> -Ross
>>>> --
>>>> You received this message because you are subscribed to the Google Groups
>>>> "Lift-committers" group.
>>>> To post to this group, send email to lift-committ...@googlegroups.com.
>>>> To unsubscribe from this group, send email to
>>>> lift-committers+unsubscr...@googlegroups.com.
>>>> For more options, visit this group at
>>>> http://groups.google.com/group/lift-committers?hl=en.
>>>>
>>>>
>>>
>>> --
>>> You received this message because you are subscribed to the Google Groups
>>> "Lift" group.
>>> To post to this group, send email to lift...@googlegroups.com.
>>> To unsubscribe from this group, send email to
>>> liftweb+unsubscr...@googlegroups.com.
>>> For more options, visit this group at
>>> http://groups.google.com/group/liftweb?hl=en.
>>>
>>>
>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "Lift" group.
>> To post to this group, send email to lift...@googlegroups.com.
>> To unsubscribe from this group, send email to
>> liftweb+unsubscr...@googlegroups.com.
>> For more options, visit this group at
>> http://groups.google.com/group/liftweb?hl=en.
>>
>>
>
> --
> You received this message because you are subscribed to the Google Groups
> "Lift" group.
> To post to this group, send email to lift...@googlegroups.com.
> To unsubscribe from this group, send email to
> liftweb+unsubscr...@googlegroups.com.
> For more options, visit this group at
> http://groups.google.com/group/liftweb?hl=en.
>
>
> --
> You received this message because you are subscribed to the Google Groups
> "Lift" group.
> To post to this group, send email to lift...@googlegroups.com.
> To unsubscribe from this group, send email to
> liftweb+unsubscr...@googlegroups.com.
> For more options, visit this group at
> http://groups.google.com/group/liftweb?hl=en.
>
>
--
You received this message because you are subscribed to the Google Groups
"Lift" group.
To post to this group, send email to lift...@googlegroups.com.
To unsubscribe from this group, send email to
liftweb+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/liftweb?hl=en.
