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  1. Core ReactOS
  2. CORE-13040

Bug in TransparentBlt with 32bpp bitmaps and alpha channel

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Details

    • Bug
    • Resolution: Fixed
    • Major
    • 0.4.7
    • Win32SS
    • None

    Description

      In windows when I call TransparentBltĀ  using a bitmap with alpha channel, it doesn't matter if the transparent color has the alpha value or not. In ros it needs the exact alpha value to work. I'm attaching a sample bitmap from the LunaInspirat theme that shows the problem. It is a 32bpp bitmap with an alhpa channel. In windows either 0x00FF00FF or 0xFFFF00FF work but in ros the transparency works only if I pass 0xFFFF00FF.
      I also attached a sample exe that does the TransparentBlt with 0x00FF00FF.
      test2.exe

      Attachments

        1. bitmap1.bmp
          10 kB
          Giannis Adamopoulos
        2. snapshot115.png
          11 kB
          jimtabor
        3. test2.exe
          114 kB
          Giannis Adamopoulos
        4. trans-fixed.patch
          0.8 kB
          Katayama Hirofumi MZ
        5. trans-fixed.png
          27 kB
          Katayama Hirofumi MZ
        6. type-a.patch
          2 kB
          Katayama Hirofumi MZ
        7. type-b.patch
          2 kB
          Katayama Hirofumi MZ

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              bug zilla Bug Zilla
              Smiley Giannis Adamopoulos
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                Created:
                Updated:
                Resolved: