[MacRuby] #818: NSBitmapImageRep#bitmapData returns empty String
#818: NSBitmapImageRep#bitmapData returns empty String -------------------------+-------------------------------------------------- Reporter: emil@… | Owner: lsansonetti@… Type: defect | Status: new Priority: major | Milestone: Component: MacRuby | Keywords: bitmap,NSBitmapImageRep, @nsBitmapImageRepObj.bitmapData -------------------------+-------------------------------------------------- after allocating an NSBitmapImageRep with @nsBitmapImageRepObj = NSBitmapImageRep.alloc.initWithBitmapDataPlanes nil, pixelsWide:200, pixelsHigh:200, bitsPerSample:8, samplesPerPixel:3, hasAlpha:false, isPlanar:false, colorSpaceName:"NSCalibratedRGBColorSpace", bytesPerRow:0, bitsPerPixel:0 @nsBitmapImageRepObj.bitmapData returns an empty String, with size zero. -- Ticket URL: <http://www.macruby.org/trac/ticket/818> MacRuby <http://macruby.org/>
#818: NSBitmapImageRep#bitmapData returns empty String -------------------------+-------------------------------------------------- Reporter: emil@… | Owner: lsansonetti@… Type: defect | Status: new Priority: major | Milestone: Component: MacRuby | Keywords: bitmap,NSBitmapImageRep, @nsBitmapImageRepObj.bitmapData -------------------------+-------------------------------------------------- Description changed by eloy.de.enige@…: Old description:
after allocating an NSBitmapImageRep with
@nsBitmapImageRepObj = NSBitmapImageRep.alloc.initWithBitmapDataPlanes nil, pixelsWide:200, pixelsHigh:200, bitsPerSample:8, samplesPerPixel:3, hasAlpha:false, isPlanar:false, colorSpaceName:"NSCalibratedRGBColorSpace", bytesPerRow:0, bitsPerPixel:0
@nsBitmapImageRepObj.bitmapData returns an empty String, with size zero.
New description: after allocating an NSBitmapImageRep with {{{ @nsBitmapImageRepObj = NSBitmapImageRep.alloc.initWithBitmapDataPlanes nil, pixelsWide:200, pixelsHigh:200, bitsPerSample:8, samplesPerPixel:3, hasAlpha:false, isPlanar:false, colorSpaceName:"NSCalibratedRGBColorSpace", bytesPerRow:0, bitsPerPixel:0 }}} @nsBitmapImageRepObj.bitmapData returns an empty String, with size zero. -- -- Ticket URL: <http://www.macruby.org/trac/ticket/818#comment:1> MacRuby <http://macruby.org/>
#818: NSBitmapImageRep#bitmapData returns empty String -------------------------+-------------------------------------------------- Reporter: emil@… | Owner: lsansonetti@… Type: defect | Status: new Priority: major | Milestone: Component: MacRuby | Keywords: bitmap,NSBitmapImageRep, @nsBitmapImageRepObj.bitmapData -------------------------+-------------------------------------------------- Comment(by lsansonetti@…): Unfortunately there is little we can do here. -bitmapData returns a "unsigned char *" type and MacRuby assumes this is a string. However, since the first byte is null, the resulted string object is empty. There are other ways of getting the data. -getPixel:atX:y: for example might work better. I am leaving this bug open in the idea that we might find a solution for the -bitmapData problem. -- Ticket URL: <http://www.macruby.org/trac/ticket/818#comment:2> MacRuby <http://macruby.org/>
ok. is this an bug with bridgesupport, or just the way things are designed? i was writing a small fractal app, and wanted to try to write directly to a bitmap, to see if it was faster than using setPixel() repeatedly. but i gues ruby doesn't allow writing to memory directly without some class (like String or Pointer) range-checking every write? -emil On 03/08/2010, at 04.25, MacRuby wrote:
#818: NSBitmapImageRep#bitmapData returns empty String -------------------------+-------------------------------------------------- Reporter: emil@… | Owner: lsansonetti@… Type: defect | Status: new Priority: major | Milestone: Component: MacRuby | Keywords: bitmap,NSBitmapImageRep, @nsBitmapImageRepObj.bitmapData -------------------------+--------------------------------------------------
Comment(by lsansonetti@…):
Unfortunately there is little we can do here. -bitmapData returns a "unsigned char *" type and MacRuby assumes this is a string. However, since the first byte is null, the resulted string object is empty.
There are other ways of getting the data. -getPixel:atX:y: for example might work better.
I am leaving this bug open in the idea that we might find a solution for the -bitmapData problem.
-- Ticket URL: <http://www.macruby.org/trac/ticket/818#comment:2> MacRuby <http://macruby.org/>
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Emil Tin
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MacRuby