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Offline Spenceboy98

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Background Color
« on: June 16, 2012, 12:31:00 am »
Is there a way to change the background color of the screen without storing a gigantic sprite?
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Offline Eiyeron

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Re: Background Color
« Reply #1 on: June 16, 2012, 06:12:24 pm »
Memcpy?
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Offline blue_bear_94

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Re: Background Color
« Reply #2 on: June 16, 2012, 06:14:57 pm »
You mean memset.
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Offline Spenceboy98

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Re: Background Color
« Reply #3 on: June 16, 2012, 09:08:29 pm »
How do I use memset?
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Offline Eiyeron

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Re: Background Color
« Reply #4 on: June 17, 2012, 02:15:33 am »
Yup, i was tired and sleepy

So, you use memset like this:
void * memset ( void * ptr, int value, size_t num );
Ptr will be a pointer to the screen, value the color, and num the number of pixel to change.
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Offline blue_bear_94

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Re: Background Color
« Reply #5 on: June 17, 2012, 02:15:06 pm »
Also, memset returns the first argument.
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Offline Spenceboy98

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Re: Background Color
« Reply #6 on: June 17, 2012, 05:17:51 pm »
Do you happen to know what number Brown is?
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Offline Juju

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Re: Background Color
« Reply #7 on: June 17, 2012, 08:10:25 pm »
0xA8000000 it is.
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Offline Spenceboy98

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Re: Background Color
« Reply #8 on: June 17, 2012, 08:25:51 pm »
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Offline Juju

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Re: Background Color
« Reply #9 on: June 17, 2012, 11:55:04 pm »
Actually, get the RGB value for brown, then encode it in 5-6-5 RGB.

So, according to my calculations, 0x9A60.

0xA8000000 is the pointer to the screen, I got confused, sorry.
« Last Edit: June 17, 2012, 11:55:57 pm by Juju »
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Re: Background Color
« Reply #10 on: June 18, 2012, 04:50:15 am »
Quote from: Eiyeron on June 17, 2012, 02:15:33 am
So, you use memset like this:
void * memset ( void * ptr, int value, size_t num );
Ptr will be a pointer to the screen, value the color, and num the number of pixel to change.
memset works with bytes, so you can use it to fill the screen, but only for few colors, where the lower byte equals the higher byte.
Black or white is OK, but brown (0x9A60) not, because 0x9A != 0x60.
Also the num is NOT number of pixels, but number of pixels * sizeof(unsigned short), because 1 pixel (= 1 unsigned short) == 2 bytes.
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