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files structure reorganization, compilation BROKEN. compilation will be fixed soon.

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Pawel Kolodziejski 2008-01-26 09:18:08 +00:00
parent d29094a775
commit 08762f496d
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107
engine/tinygl/image_util.cpp Normal file
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#include "tinygl/zgl.h"
// image conversion
void gl_convertRGB_to_5R6G5B(unsigned short *pixmap, unsigned char *rgb,
int xsize, int ysize) {
int i, n;
unsigned char *p;
p = rgb;
n = xsize * ysize;
for (i = 0; i < n; i++) {
pixmap[i] = ((p[0] & 0xF8) << 8) | ((p[1] & 0xFC) << 3) | ((p[2] & 0xF8) >> 3);
p += 3;
}
}
// linear interpolation with xf, yf normalized to 2^16
#define INTERP_NORM_BITS 16
#define INTERP_NORM (1 << INTERP_NORM_BITS)
static inline int interpolate(int v00, int v01, int v10, int xf, int yf) {
return v00 + (((v01 - v00) * xf + (v10 - v00) * yf) >> INTERP_NORM_BITS);
}
// TODO: more accurate resampling
void gl_resizeImage(unsigned char *dest, int xsize_dest, int ysize_dest,
unsigned char *src, int xsize_src, int ysize_src) {
unsigned char *pix, *pix_src;
float x1, y1, x1inc, y1inc;
int xi, yi, j, xf, yf, x, y;
pix = dest;
pix_src = src;
x1inc = (float)(xsize_src - 1) / (float)(xsize_dest - 1);
y1inc = (float)(ysize_src - 1) / (float)(ysize_dest - 1);
y1 = 0;
for (y = 0; y < ysize_dest; y++) {
x1 = 0;
for (x = 0; x < xsize_dest; x++) {
xi = (int)x1;
yi = (int)y1;
xf = (int)((x1 - floor(x1)) * INTERP_NORM);
yf = (int)((y1 - floor(y1)) * INTERP_NORM);
if ((xf + yf) <= INTERP_NORM) {
for (j = 0; j < 3; j++) {
pix[j] = interpolate(pix_src[(yi * xsize_src + xi) * 3 + j],
pix_src[(yi * xsize_src + xi + 1) * 3 + j],
pix_src[((yi + 1) * xsize_src + xi) * 3 + j],
xf, yf);
}
} else {
xf = INTERP_NORM - xf;
yf = INTERP_NORM - yf;
for (j = 0; j < 3; j++) {
pix[j] = interpolate(pix_src[((yi + 1) * xsize_src + xi + 1) * 3 + j],
pix_src[((yi + 1) * xsize_src + xi) * 3 + j],
pix_src[(yi * xsize_src + xi + 1) * 3 + j],
xf, yf);
}
}
pix += 3;
x1 += x1inc;
}
y1 += y1inc;
}
}
#define FRAC_BITS 16
// resizing with no interlating nor nearest pixel
void gl_resizeImageNoInterpolate(unsigned char *dest, int xsize_dest, int ysize_dest,
unsigned char *src, int xsize_src, int ysize_src) {
unsigned char *pix, *pix_src, *pix1;
int x1, y1, x1inc, y1inc;
int xi, yi, x, y;
pix = dest;
pix_src = src;
x1inc = (int)((float)((xsize_src) << FRAC_BITS) / (float)(xsize_dest));
y1inc = (int)((float)((ysize_src) << FRAC_BITS) / (float)(ysize_dest));
y1 = 0;
for (y = 0; y < ysize_dest; y++) {
x1 = 0;
for (x = 0; x < xsize_dest; x++) {
xi = x1 >> FRAC_BITS;
yi = y1 >> FRAC_BITS;
pix1 = pix_src + (yi * xsize_src + xi) * 3;
pix[0] = pix1[0];
pix[1] = pix1[1];
pix[2] = pix1[2];
pix += 3;
x1 += x1inc;
}
y1 += y1inc;
}
}