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Bug 4359 - SDL_CalculatePitch() returns zero for 1 and 4 bits per pixel formats
Summary: SDL_CalculatePitch() returns zero for 1 and 4 bits per pixel formats
Status: RESOLVED DUPLICATE of bug 4785
Alias: None
Product: SDL
Classification: Unclassified
Component: video (show other bugs)
Version: 2.0.9
Hardware: x86_64 Linux
: P2 minor
Assignee: Sam Lantinga
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2018-11-05 18:14 UTC by DafabHoid
Modified: 2019-09-11 14:13 UTC (History)
1 user (show)

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Description DafabHoid 2018-11-05 18:14:15 UTC 
Calling SDL_CalculatePitch() with one of the pixel formats INDEX1MSB, INDEX1LSB, INDEX4MSB, INDEX4LSB returns zero.
This makes it impossible to create a surface with one of those formats, because SDL_CreateRGBSurfaceWithFormat returns a surface with a pitch of 0 and a pixels array malloc'ed with size 0. For obvious reasons such a surface can't be blitted nor converted and is therefore not usable.

The reason is that SDL_BYTESPERPIXEL() returns 0 for those formats, which is probably a problem in some other areas as well. I do not know if SDL plans to still support those formats, as they do not seem to be very popular, but in its current state they are just unusable.
Comment 1 Sylvain 2019-09-11 14:13:22 UTC 
This is duplicate of bug 4785

*** This bug has been marked as a duplicate of bug 4785 ***