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
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