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Forum Topic - gf_context_set_pattern function: (4 Items)

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shen xifeng

10/19/2011 4:41 AM

post89441

Hi ,

from the help documents, it says the second parameter of this function is pattern which is A pointer to the bitmap 
containing the pattern.

my question is how can I define the bitmap ?

Misha Nefedov

10/19/2011 9:38 AM

post89451

Re: gf_context_set_pattern function

The pattern is a pointer to an array of characters defining the pattern bitmap.
This array should define an 8X8 single bit/pixel bitmap packing 8 pixels/byte, with no padding.

shen xifeng

10/21/2011 5:40 AM

post89520

Re: gf_context_set_pattern function

Hi Misha,


thanks for your help.


I have an another question, how can I use this 8x8 value combine with ROPs(gf_context_set_rop());


for example,

I want to draw an 8x8 rectangle and set all the needed values like this,


mypattern[8] = {0x00, 0x44, 0x00,0x11, 0x00,0x44, 0x00,0x11 };

fgcolor:    0xFFFF0000

bgcolor:   0xFF0000FF

rop:          GF_ROP_PDSnaon 


 what is the formula to get the result ?

Misha Nefedov

10/21/2011 8:36 AM

post89527

Re: gf_context_set_pattern function

If I understand you correctly you should try something like this:

-- disable all ROP operation
-- set fgcolor to your "bgcolor"
-- draw a solid rectangle (gf_draw_rect()) where you need it, let's say @ X,Y
-- set the pattern
-- set the ROP
-- set fgcolor to your "fgcolor"
-- draw a solid rectangle again @ X,Y

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