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annotate docs/32bpp.txt @ 8386:b61dbe67cbb3 draft

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(svn r11956) -Fix [FS#1675]: Disallow building locks and docks on rapids.
author peter1138 <peter1138@openttd.org>
date Wed, 23 Jan 2008 08:47:49 +0000
parents 547d97a47394
children 54dfd3720fa1
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547d97a47394 (svn r10143) -Add: store the filename of the grfs opened and allow easy access to the name
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1 32bpp and OpenTTD
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2 =================
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4 OpenTTD has 32bpp support. This means: OpenTTD still is 8bpp, but it has the
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5 posibility to override the graphics with 32bpp. This means that it isn't a
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6 replacement of grf or newgrf, but simply an addition. If you want to use 32bpp
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7 graphics of a newgrf, you do need the newgrf itself too (with 8bpp graphics).
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10 The Format
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11 ----------
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13 32bpp images are stored in PNG. They should go in:
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14 data/sprites/<grfname>/<SpriteID>.png
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16 For example, a grfname would be 'openttd' (without .grf, lowercase), and the
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17 SpriteID 3, to override the 3rd sprite in openttd.grf with a 32bpp version.
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19 The format of this PNG can be almost anything, but we advise to use RGBA
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20 format. Alpha-channel is fully supported.
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22 As the core of OpenTTD is 8bpp, and because you of course want company colours
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23 in your images, you will need to add a mask for every sprite that needs colour
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24 remapping. The name is simular as above, only you have to put a 'm' behind the
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25 SpriteID. This image should be a 8bpp palette image, where the palette is the
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26 OpenTTD palette. Upon load of the PNG, the mask is loaded too, and overrides
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27 the RGB (not the Alpha) of the original PNG image, and replacing it with a
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28 8bpp color remapped and converted to 32bpp.
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30 An other thing that OpenTTD needs in your png, is 2 tEXt chunks: x_offs and
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31 y_offs. This to define the x- and y-offset, of course. Use the tool we supply
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32 to add this information. Sadly enough most graphical editors trashes those
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33 chunks upon save, so you have to readd it every time you save your image.
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35 Your images should be the same as the grf, in size.
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