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Bug 1503 - SDL_image cannot load monochrome or greyscale 8-bit PNG files
Summary: SDL_image cannot load monochrome or greyscale 8-bit PNG files
Status: RESOLVED FIXED
Alias: None
Product: SDL_image
Classification: Unclassified
Component: misc (show other bugs)
Version: unspecified
Hardware: All All
: P2 normal
Assignee: Sam Lantinga
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2012-05-23 08:57 UTC by pelya
Modified: 2013-03-10 14:26 UTC (History)
2 users (show)

See Also:

Attachments
2-color grayscale PNG (232 bytes, image/png)
2012-05-23 08:57 UTC, pelya 		Details
8-bit greyscale (870 bytes, image/png)
2012-05-25 11:04 UTC, Adam Olsen 		Details
bug 1503 fix (494 bytes, patch)
2013-03-06 10:05 UTC, q66 		Details | Diff
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Description pelya 2012-05-23 08:57:54 UTC 
Created attachment 860 [details]
2-color grayscale PNG

Branch default, rev. 330:1230766039be
SDL_image will fail when trying to load the PNG file I've attached, it's in 2-color grayscale format.

I remember opening a very similar bug a while ago.
Comment 1 Adam Olsen 2012-05-25 11:04:24 UTC 
Created attachment 861 [details]
8-bit greyscale

Here's an 8-bit greyscale that SDL_image also fails to load (reports "Out of memory").

SDL1.3 trunk of a few weeks ago, SDL_image trunk of today.
Comment 2 Adam Olsen 2012-05-25 11:47:57 UTC 
I poked around and SDL_MasksToPixelFormatEnum only supports INDEX8 and RGB332, which isn't what IMG_LoadPNG_RW is asking for.

I'm not sure what the solution is here.  I don't see any greyscale formats listed in SDL_PIXELFORMAT_*.  Maybe the easiest is to pretend it's 8-bit indexed but with a no-op palette that can be ignored?
Comment 3 q66 2013-03-06 10:05:16 UTC 
Created attachment 1058 [details]
bug 1503 fix

Hello, just attaching a fix here (by Lee "eihrul" Salzman) to make it noticed :)

DK
Comment 4 q66 2013-03-10 14:26:05 UTC 
fixed in http://hg.libsdl.org/SDL_image/rev/9b6ceb2c4a3b