BMP format - description of the Windows graphic format.

Mysic by: ALOS(JNR)/SPARK               
                                        
Format description BMP for   
 Window 3.0 (DIB)        
__________________________________________
                                        
                                        
 The main difference between the new file format
(DIB) - Device Independent Bitmap (appa-
A value-independent bit image) is
The only thing is that they use encoding
colors with one bit plane.      
                                        
 new format bitmap files
start with structure
BITMAPFILEHEADER:                       
                                        
   typedef struct tag BITMAPFILEHEADER  
                                        
word bfType: file type  (for bitmap - BM)
 dword bfSize; //file size in dword      
word bfReserved1: not used                           
word bfReserved2: not used                           
dword bfOffbits: offset of the bit image data from the
                  dexterity in bytes                            
                                                            
                                                            
  Directly
 behind it is
 structure
 BITMAPINFO , co-
 держащая всю ин-
 формацию о бито-
 вом  образе. Она
 делится  на  две
 части: структуру
 BITMAPINFOHEADER
 ,    описывающей
 размеры и цвето-
 вой формат бито-
 вого  образа,  и
 массив  структур
 RGBQUAD ,опреде-
 ляющей  цветовую
 палитру:        
                 
                 
                 
                 
                 
      
      
      
      
      
      
      
      
      
      
      
      
      
        
        
        
        
        
        
        
        
     typedef struct tag BITMAPINFO;     
     BITMAPINFOHEADER   bmiHeader;      
     RGBQUAD            bmiColors [1];  
                                        
                                        
                                        
   typedef struct tag BITMAPINFOHEADER  
                                        
dword biSize:          число  байт ,  занимаемых  структурой
                       BITMAPIUFOHEADER                     
dword biWidth:         ширина битового образа в пикселах    
dword biHeight:        высота битового образа в пикселах    
word biPlames:         число битовых плоскостей устройства  
word biBitCovmt:       число битов на пиксель               
dword biCompressiom:   тип сжатияdword biSizeImage:  image size in bytes             
dword biXPelsPerMeter: horizontal resolution of the device,
                       pixel/m                             
dword biYPelPerMeter:  vertical resolution of the device,
                       pixel/m                             
dword biClrUsed:  number of colors used            
dword biClrImportamt: numberof "important" colors                
                                                            
                                                            
                                                            
 BITMAPINFOHEADER              
                                        
 More details               
                                        
 biSize - usually used for
easier access to the color table.      
                                        
 biPlanes  - defines the number of bits
planes; however, since the color code
arranged by successive bits, this
the number is always equal to 1.                   
                                        
 biBitCount  - this field is determined
number of colors used by the bitmap
zom.  Depending on the coding method
niya, can take the following values:          
                                        
 1  - the bit image is monochrome, and
the color table must contain two elements
cop. Each bit in the data array is coded
one pixel is removed. If the bit value is
0 , then the pixel becomes the first color
tables;  if -  1, the pixel becomes
second color of the table.                  
                                        
 4 - the bit image has a maximum 16 
colors, and an arraybmiColors (color table
Comrade) has up to 16 elements. Coloreveryone
pixel is determined by the color table
using a four-bit index. Nap-
example, if the first byte of data has
valueZAh, then when displaying bit-
th image, the color of the first pixel determines
This is  the fourth  element of the color table, and
the color of the second is eleventh.            
                                        
 8 - the bit image has a maximum 256
colors, and the color table has up to256
elements.  Each byte of the data array
determines the color of one pixel.         
                                        
 24  - the bit image has a maximum of 2
in  24th  color degree. Color Chart
is empty, and the color of the pixels is determined by the
kets of three bytes describing the colors
commercial intensities of red, green and
blue colors. biCompression - compression type.  Maybe
take values:                     
                                        
BI_RGB - no compression;          
BI_RLE8 - compression for format 8 bit to
           pixel;                      
BI_RLECH - compression for format 4 bits to
           pixel                      
                                        
 biXPelsPerMeter  and biYPelsPerMeter -
can be used to select from a list of
resource pictograms, the most suitable
for this device.           
                                        
 biClrUsed  - number of colors used
data in a bitwise manner. If 0, then
all colors of the palette are used (specified-
nes in the bmiColors array). biClrImportant - used for
control the color display algorithm
Comrade So, if four different applications
tions are displayed on the screen one bit at a time
different image with  75  colors each, then
adapter that outputs 256colors simultaneously
Of course, it won’t be able to be completely authentic
display all 4 pictures on the screen. B
In this case, a replacement mechanism is used
colors - the bit image with the most
lower priority and its "extra" colors
are replaced by the most suitable ones.        
                                        
 typedef struct tagRGBQUAD       
                                        
byte rgbRed: intensity red
byte rgbGreen: intensity green
byte rgbBlue: intensity blue
byte rgbRserved: not used       
 RGBQUAD               
                                        
    After all parameters are bit-
of the image are defined, the file contains the
mi scan lines of the bit plane, and
the first scan line in the format DIB is considered
the bottom scan line is (i.e. the beginning of the
                                        
 typedef struct tagRGBQUAD       
                                        
byte rgbRed: intensity red
byte rgbGreen: intensity green
byte rgbBlue: intensity blue
byte rgbRserved: not used       
 RGBQUAD               
                                        
    After all parameters are bit-
of the image are defined, the file contains the
mi scan lines of the bit plane, and
first scan linein the format DIB read
the bottom scan line is (i.e. the beginning of the
the ordinate is in the lower left corner
images).                           
                                        
 Scan lines are aligned to  32-bit
border - dword !!!                     
                                        
__________________________________________