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Internet Message Format  |  1999-09-01  |  6KB
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  9. From: Rune Zedeler <rune@zedeler.dk>
  10. To: Andrew Crowe <amos-list@onelist.com>
  11. Date: Fri, 27 Aug 1999 21:16:46 +0100
  12. Message-ID: <yam7908.2339.137790792@mail010.worldonline.dk>
  13. In-Reply-To: <yam7908.1882.1196276776@mail.enterprise.net>
  14. X-Mailer: YAM 1.3.5 [040] - Amiga Mailer by Marcel Beck
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  22. Subject: Re: [amos-list] Transparent Screen Copying
  23. Status: O
  24. X-Status: 
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  33. --BOUNDARY.7908.2339.137790792.4
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  36.  
  37. On 27-Aug-99, Andrew Crowe wrote:
  38.  
  39. >   I want to be able to copy one screen onto another so that all of colo=
  40. ur 0
  41. >is transparent, and shows through the destination screen's gfx.
  42.  
  43. I made a routing that does it.
  44. I don't don't know if it's faster than getting a bob and pasting it.
  45. I guess it is.
  46. In all cases it usesless temp memory (it uses the memery of onebitplane, =
  47. that
  48. is 10k in 320*256)
  49. The routine expects the source and dest screen to be of the same size (no=
  50. t
  51. same number  of colours, though)
  52. You have to give it a number of a temp-bank it can use for the mask. And =
  53. set a
  54. flag: True if the bank is to be reserved and erased; False if it is alrea=
  55. dy
  56. reserved.
  57.  
  58. By the way, during the test I found a(nother) bug in the AP-compiler:
  59. Min() doesn't work with floats.
  60. Try to compile
  61.   Print Min(6.0,4.0)
  62. (Result 6, should be 4)
  63.  
  64. Well, here it is. Only tested a little, but it appears to work.
  65. (Copy 16 colour 320*256 to 16 colour 320*256 takes 5 vblanks on '060 afte=
  66. r
  67. compilation):
  68.  
  69. -- =
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  85. --BOUNDARY.7908.2339.137790792.4
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  132.  
  133. --BOUNDARY.7908.2339.137790792.4--
  134.  
  135.