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{Bitmap_direct}



CLASS {Bitmap_direct}
, UNTESTED, BYTES :








A class on base of the {Bitmap} to work with pixels as an array of bytes. To do so, an object should be locked (entire or a range of rows) using functions Lock / Lock_rows. A lock result can be accessed as an array of bytes Pixels[*]. Do not forget to unlock the bitmap at the end of an operation(Unlock). This is not too critical but your application can fail to function.


IMPORT : 
{Bitmap}
, 
{AL4_drawing}
 .


BASE CLASS 
{Bitmap} .


 







FUN 
New_bitmap_direct

(

     INT 
Pixels_w|idth
, 

     INT 
Pixels_h|eight
, 

     INT 
Bpp|_value
)
 ==> {Bitmap_direct} 
 , NEW







BYTE 
Pixels|_array[*]






INT 
Row_width|_bytes
 , READ






INT 
Bpp||Bits_per_pixel
 , READ





 






METHOD 
Lock|_entire_bitmap

(
BOOL 
Read|_from_source
)







INT 
Locked_Y|_start
 , READ






INT 
Locked_h|eight
 , READ





     






METHOD 
Lock_rows

(

     INT 
Y|_top_row
, 

     INT 
Height_rows
, 

     BOOL 
Read|_from_source
)











OVERRIDE 
Unlock

(
BOOL 
Write|_back_to_bitmap
)










ENUMERATION {rgb|a_items_of_color} : 

        'R|ED_COMPONENT_ITEM'
 ,

        'G|REEN_COMPONENT_ITEM'
 ,

        'B|LUE_COMPONENT_ITEM'
 ,

        'A|LPHA_COMPONENT_ITEM'
 .












FUN 
Mask_RGB

(
{rgb} 
C|omponent_item
)
 ==> INT 












FUN 
Shift_RGB|_left

(
{rgb} 
C|omponent_item
)
 ==> INT 







END