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  1. JDK
  2. JDK-6587560

OpenJDK problem handling bitmaps returned when LCD text is requested.

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    • 2d
    • b17
    • 7
    • b33
    • generic, x86
    • generic, linux_ubuntu
    • Not verified

        In the new OpenJDK b17 usage of freetype, when requesting LCD mode glyphs, if
        there are embedded bitmaps, freetype may return those.
        Freetype indicates this with as
        ftglyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO

        This is detected and generally handled correctly.
        However when the implementation has already calculated that if it requested
        LCD bitmaps, the "width" of the glyph in pixels is 1/3 of ftglyph->bitmap.width.
        This doesn't appear to be a valid assumption in the case when an embedded bitmap
        is requested.

        The "width" problem is for the LCD_HRGB (FT_PIXEL_MODE_LCD) case
        A similar problem exists for the LCD_VRGB (FT_PIXEL_MODE_LCD_V) case.

        In the width case the glyphs are rendered thin and multi-coloured.
        In the height case the glyphs are rendered clipped vertically

        For "mono" we should always set
                  glyphInfo->width = width; ( == ftglyph->bitmap.width)
                  glyphInfo->height = height; ( == ftglyph->bitmap.height)

              igor Igor Nekrestyanov (Inactive)
              prr Philip Race
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