On Jul 5, 10:31 pm, Mark Triggs <[email protected]> wrote:
> (defn bi-get-pixels
> [#^BufferedImage bi]
> (let [raster (.getData bi)
> pixels (.getPixels raster 0 0 (.getWidth bi) (.getHeight bi)
> (cast (Class/forName "[I") nil))]
> (vec pixels)))
This still generates a single reflection warning, but #^ints before
the cast fixes it. That gave me an idea:
(defn bi-get-pixels
[#^BufferedImage bi]
(vec (.. bi (getData)
(getPixels 0 0 (.getWidth bi) (.getHeight bi)
#^ints (identity nil)))))
Which does the right thing with no warnings.
Thanks for the help,
-Phil
>
> Cheers,
>
> Mark
>
> On Jul 5, 10:18 pm, "[email protected]"
>
> <[email protected]> wrote:
> > Hi,
>
> > The following code works as expected:
>
> > (import 'javax.imageio.ImageIO 'java.io.File
> > 'java.awt.image.BufferedImage)
> > (defn bi-get-pixels
> > [bi]
> > (vec (.. bi (getData) (getPixels 0 0 (.getWidth bi) (.getHeight bi)
> > nil))))
> > (bi-get-pixels (. ImageIO read (File. "/home/phil/prog/small-
> > test.png")))
>
> > But if *warn-on-reflection* is true, it generates four warnings. If we
> > try to shut it up with a type hint:
>
> > (defn bi-get-pixels
> > [#^BufferedImage bi]
> > (vec (.. bi (getData) (getPixels 0 0 (.getWidth bi) (.getHeight bi)
> > nil))))
>
> > Exception in thread "main" java.lang.IllegalArgumentException: More
> > than one matching method found: getPixels (imagio-test.clj:7)
> > at clojure.lang.Compiler.analyzeSeq(Compiler.java:4558)
> > ...
> > Caused by: java.lang.IllegalArgumentException: More than one matching
> > method found: getPixels
> > at clojure.lang.Compiler.getMatchingParams(Compiler.java:2122)
> > at clojure.lang.Compiler$InstanceMethodExpr.<init>
> > (Compiler.java:1159)
> > at clojure.lang.Compiler$HostExpr$Parser.parse(Compiler.java:
> > 810)
> > at clojure.lang.Compiler.analyzeSeq(Compiler.java:4551)
> > ... 34 more
>
> > The problem here is that getPixels has three forms:
> > (http://java.sun.com/j2se/1.4.2/docs/api/java/awt/image/Raster.html)
> > double[] getPixels(int x, int y, int w, int h, double[] dArray)
> > Returns a double array containing all samples for a
> > rectangle of pixels, one sample per array element.
> > float[] getPixels(int x, int y, int w, int h, float[] fArray)
> > Returns a float array containing all samples for a rectangle
> > of pixels, one sample per array element.
> > int[] getPixels(int x, int y, int w, int h, int[] iArray)
> > Returns an int array containing all samples for a rectangle
> > of pixels, one sample per array element.
>
> > In each case, if the final argument is NULL it is ignored, and if not
> > the array is populated with the return data from the call (generating
> > an error if it's not large enough).
>
> > Is it possible to specify which invocation of getPixels I intend
> > without passing an array? I've tried putting #^ints in some likely-
> > looking places, but nil can't be type-hinted and the others seem to
> > have no effect. I've also tried splitting the .. up:
>
> > (defn bi-get-pixels
> > [#^BufferedImage bi]
> > (let [rast (.getData bi)
> > #^ints pi (.getPixels rast 0 0 (.getWidth bi) (.getHeight bi) nil)]
> > pi))
>
> > But this doesn't work either. I could do manual reflection on Raster
> > to get the correct method and .invoke it, but that seems far more
> > complicated than necessary. Any other ideas?
>
> > -Phil
>
>
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