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| [A4] Does bitmap loading even work anymore? |
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Chris Katko
Member #1,881
January 2002
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input loads. Both identify as bitmaps using the "$ identify [filename]" command from ImageMagick. Both identify as "windows bmp image" in Xubuntu File Manager. Both load in all other programs. I can't get Allegro 4 with loadpng to work. I can't get bitmaps to work. This is so bloody frustrating! [edit] loadpng works now, yay. But what's with them dern bitermappers. -----sig: |
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Edgar Reynaldo
Major Reynaldo
May 2007
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I'm think only 24-bit bitmaps will load under allegro 4, not sure anymore. My Website! | EAGLE GUI Library Demos | My Deviant Art Gallery | Spiraloid Preview | A4 FontMaker | Skyline! (Missile Defense) Eagle and Allegro 5 binaries | Older Allegro 4 and 5 binaries | Allegro 5 compile guide |
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#00JMP00
Member #14,740
November 2012
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Some time ago, I found allegro (4.2) to be somewhat picky about bitmaps. At the end I only could load bitmaps with the 24-bit tga load routine. Maybe it helps. |
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Thomas Fjellstrom
Member #476
June 2000
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Hm, allegro 4.4 should have support for many BMP formats, not all of them, you can't use any kind of encoding or compression. Stick to 8, 15/16 and 24bpp and it aught to work... I seem to remember ms updated their bmp format somewhat recently (past 8 years?) And one of the allegro's adding support for that, but i can't remember if 4.4 got it or not. I think it's a new header chunk. Might try saving in an older BMP format if you can. -- |
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Elias
Member #358
May 2000
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You're probably thinking of https://github.com/liballeg/allegro5/commit/d4212d8b2a79d523aa35d8b2 and it's Allegro 5 only. [edit:] So what this means is, Allegro 4 could only load V1 bitmaps, i.e. header size of 12 byte or 40 byte. According to wikipedia these two formats were introduced with Windows 2.0 and Windows NT/3.1, respectively. Allegro 5 on the other hand can read all headers, even V4 and V5 introduced with win95 and win98 -- |
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Thomas Fjellstrom
Member #476
June 2000
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Sounds really dumb that A4 never had V4/V5 -- |
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Elias
Member #358
May 2000
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Except why would anybody ever use .bmp for anything? -- |
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Thomas Fjellstrom
Member #476
June 2000
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Elias said: Except why would anybody ever use .bmp for anything? obviously people do -- |
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Chris Katko
Member #1,881
January 2002
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I couldn't get png to work at the time, so I tried to fallback on bmp. I spent an hour or two trying to find a mistake in my own code. Regardless, it seems odd to support "bmp" but not 99% of them. At the very least, we need a big glaring "THIS WILL FAIL ON 'NEW' BITMAPS." text disclaimer in the A4 documentation. Come to think of it, didn't I stumble head first into this same issue last year or two ago? -----sig: |
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Thomas Fjellstrom
Member #476
June 2000
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I think maybe it's time i started a Allegro todo list for myself There's some simple functions i want to add to a5, and a4 could use a little love now and then. -- |
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Elias
Member #358
May 2000
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I wonder if anyone except Microsoft supports more than 99% of the .bmp format. Among other things a .bmp can contain JPEG and PNG compressed data - it's one of those Microsoft formats which can basically contain anything. -- |
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Chris Katko
Member #1,881
January 2002
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Elias said: I wonder if anyone except Microsoft supports more than 99% of the .bmp format.
The ones I exported from VLC didn't work in Allegro. -----sig: |
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Elias
Member #358
May 2000
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Well, Alelgro 4 only supports 20% I guess, Allegro 5 should be 99% (probably same subset as VLC). -- |
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it's new enough. If theres one thing that needs to be (and can be) backported, its this.
but maybe they should use png instead, but hey.
