?? colorconversion.c
字號:
#include "ejpgl.h"
#define RGB2Y(r, g, b) (((66*r + 129*g + 25*b + 128)>>8)+128)
#define RGB2Cr(r, g, b) (((-38*r - 74*g + 112*b + 128)>>8)+128)
#define RGB2Cb(r, g, b) (((112*r - 94*g - 18*b + 128)>>8)+128)
void RGB2YCrCb(signed char pixelmatrix[MACRO_BLOCK_SIZE][MACRO_BLOCK_SIZE*3],signed char YMatrix[MATRIX_SIZE][MATRIX_SIZE],signed char CrMatrix[MATRIX_SIZE][MATRIX_SIZE],signed char CbMatrix[MATRIX_SIZE][MATRIX_SIZE], unsigned int sample)
{
unsigned int row, col, rowoffset, coloffset, xoffset, yoffset;
for(row = 0;row < MATRIX_SIZE; row++) {
for(col = 0; col < MATRIX_SIZE; col++) {
coloffset = (sample&0x01)*8;
rowoffset = (sample&0x02)*4;
YMatrix[row][col] = RGB2Y(pixelmatrix[row+rowoffset][(col+coloffset)*3+2],pixelmatrix[row+rowoffset][(col+coloffset)*3+1],pixelmatrix[row+rowoffset][(col+coloffset)*3]) - 128;
if (col%2==0) {
yoffset = (sample&0x01)*4;
xoffset = (sample&0x02)*2;
if (row%2==0) {
CrMatrix[xoffset+(row>>1)][yoffset+(col>>1)] = RGB2Cr(pixelmatrix[row+rowoffset][(col+coloffset)*3+2],pixelmatrix[row+rowoffset][(col+coloffset)*3+1],pixelmatrix[row+rowoffset][(col+coloffset)*3]) - 128;
} else {
CbMatrix[xoffset+((row)>>2)][yoffset+(col>>2)] = RGB2Cb(pixelmatrix[row+rowoffset][(col+coloffset)*3+2],pixelmatrix[row+rowoffset][(col+coloffset)*3+1],pixelmatrix[row+rowoffset][(col+coloffset)*3]) - 128;
}
}
}
}
}
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