Rapid image pixel operations

Rapid image pixel operations

Provides two APIs: setdibpixelcolor and getdibpixelcolor,

Quickly set and retrieve DIB image pixels to replace the setpixel and getpixel provided by the system.

 

Setpixel and getpixel are DC-based operations, which are too slow.

 

// Imagesetpixelfast. cpp: defines the entry point of the console application.
// Cheungmine
# Include "stdafx. H"
# Include <atlstr. h>
# Include <atlimage. h>

// 24-bit color and 16-bit color conversion macro
// By cheungmine
# Define rgb888torgb565 (R, G, B) (Word (r) <8) & 0xf800) | (Word (g) <3) & 0x7e0) | (Word (B)> 3 ))))

# Define rgbtorgb565 (RGB) (Word) (RGB)> 3) & (0x1f) <11) | (Word) (RGB)> 10) & (0x3f) <5) | (Word) (RGB)> 19 )) & (0x1f ))))

# Define rgb888torgb555 (R, G, B) (Word (r) <7) & 0x7c00) | (Word (g) <2) & 0x3e0) | (Word (B)> 3 ))))

# Define rgbtorgb555 (RGB) (Word) (RGB)> 3) & (0x1f) <10) | (Word) (RGB)> 11) & (0x1f) <5) | (Word) (RGB)> 19 )) & (0x1f ))))

# Define rgb555torgb (rgb555) (DWORD) (byte) (rgb555)> 7) & 0xf8) | (Word) (byte) (rgb555)> 2) & 0xf8) <8) | (DWORD) (byte) (rgb555) <3) & 0xf8 )) <16 )))

# Define rgb565torgb (rgb565) (DWORD) (byte) (rgb565) & 0xf800)> 11) <3) | (word) (byte) (rgb565) & 0x07e0)> 5) <2) <8) | (DWORD) (byte) (rgb565) & 0x001f) <3) <16 )))

Typedef struct
{
Void * lpbits;
Int width;
Int height;
Int nbpp;
Int npitch;
Int row;
Int Col;
DWORD dwcolor;
} Dibitsdesc;

Void setdibpixelcolor (dibitsdesc * pdib)
{
If (pdib-> npitch> 0 ){
// Top-down Dib
If (pdib-> nbpp = 16 ){
Int at =-pdib-> npitch * (pdib-> row-pdib-> height + 1) + pdib-> Col * 2;
* (Word *) (& (byte *) pdib-> lpbits) [at]) = (Word) pdib-> dwcolor;
}
If (pdib-> nbpp = 24 ){
Int at =-pdib-> npitch * (pdib-> row-pdib-> height + 1) + pdib-> Col * 3;
Byte * GBR = & (byte *) pdib-> lpbits) [at];
* GBR ++ = getbvalue (pdib-> dwcolor );
* GBR ++ = getgvalue (pdib-> dwcolor );
* GBR = getrvalue (pdib-> dwcolor );
}
Else if (pdib-> nbpp = 32 ){
Int at =-pdib-> npitch * (pdib-> row-pdib-> height + 1) + pdib-> Col * 4;
Byte * gbra = & (byte *) pdib-> lpbits) [at];
* Gbra ++ = 0;
* Gbra ++ = getbvalue (pdib-> dwcolor );
* Gbra ++ = getgvalue (pdib-> dwcolor );
* Gbra = getrvalue (pdib-> dwcolor );
}
}
Else {
// Bottom-up Dib
If (pdib-> nbpp = 16 ){
Int at = pdib-> npitch * pdib-> row + pdib-> Col * 2;
* (Word *) (& (byte *) pdib-> lpbits) [at]) = (Word) pdib-> dwcolor;
}
If (pdib-> nbpp = 24 ){
Int at = pdib-> npitch * pdib-> row + pdib-> Col * 3;
Byte * GBR = & (byte *) pdib-> lpbits) [at];
* GBR ++ = getbvalue (pdib-> dwcolor );
* GBR ++ = getgvalue (pdib-> dwcolor );
* GBR = getrvalue (pdib-> dwcolor );
}
Else if (pdib-> nbpp = 32 ){
Int at = pdib-> npitch * pdib-> row + pdib-> Col * 4;
Byte * AgBr = & (byte *) pdib-> lpbits) [at];
* AgBr ++ = 0;
* AgBr ++ = getbvalue (pdib-> dwcolor );
* AgBr ++ = getgvalue (pdib-> dwcolor );
* AgBr = getrvalue (pdib-> dwcolor );
}
}
}

Void getdibpixelcolor (dibitsdesc * pdib)
{
If (pdib-> npitch> 0 ){
// Top-down Dib
If (pdib-> nbpp = 16 ){
Int at =-pdib-> npitch * (pdib-> row-pdib-> height + 1) + pdib-> Col * 2;
Pdib-> dwcolor = * (word *) (& (byte *) pdib-> lpbits) [at]);
}
If (pdib-> nbpp = 24 ){
Int at =-pdib-> npitch * (pdib-> row-pdib-> height + 1) + pdib-> Col * 3;
Byte * GBR = & (byte *) pdib-> lpbits) [at];
Pdib-> dwcolor = RGB (GBR [2], GBR [1], GBR [0]);
}
Else if (pdib-> nbpp = 32 ){
Int at =-pdib-> npitch * (pdib-> row-pdib-> height + 1) + pdib-> Col * 4;
Byte * AgBr = & (byte *) pdib-> lpbits) [at];
Pdib-> dwcolor = RGB (AgBr [2], AgBr [1], AgBr [0]);
}
}
Else {
// Bottom-up Dib
If (pdib-> nbpp = 16 ){
Int at = pdib-> npitch * pdib-> row + pdib-> Col * 2;
Pdib-> dwcolor = * (word *) (& (byte *) pdib-> lpbits) [at]);
}
If (pdib-> nbpp = 24 ){
Int at = pdib-> npitch * pdib-> row + pdib-> Col * 3;
Const byte * GBR = & (byte *) pdib-> lpbits) [at];
Pdib-> dwcolor = RGB (GBR [2], GBR [1], GBR [0]);
}
Else if (pdib-> nbpp = 32 ){
Int at = pdib-> npitch * pdib-> row + pdib-> Col * 4;
Const byte * AgBr = & (byte *) pdib-> lpbits) [at];
Pdib-> dwcolor = RGB (AgBr [2], AgBr [1], AgBr [0]);
}
}
}

Int main (INT argc, char * argv [])
{
Cimage IMG;

IMG. Load ("C: // greatwall.jpg ");

Dibitsdesc Dib;

DiB. width = IMG. getwidth ();
DiB. Height = IMG. getheight ();
DiB. nbpp = IMG. getbpp ();
DiB. npitch = IMG. getpitch ();
DiB. lpbits = IMG. getbits ();

If (IMG. isdibsection ())
{
For (INT r = 0; r <dib. height; r ++ ){
For (int c = 0; C <dib. width; C ++ ){
// Too slow to use: IMG. setpixel (C, R, RGB (0,255, 0 ));
DiB. Row = R;
DiB. Col = C;
DiB. dwcolor = RGB (0,255, 0 );
Setdibpixelcolor (& DIB );
}
}
}

IMG. Save ("C: // test2.bmp ");

Return 0;
}