25 #define ONE_HALF (1 << (SCALEBITS - 1)) 26 #define FIX(x) ((int) ((x) * (1L << SCALEBITS) + 0.5)) 28 #define err_if(expr) do { \ 30 fprintf(stderr, "%s\n", strerror(errno)); \ 36 unsigned char *cr,
unsigned char *src,
39 int wrap, wrap3, x, y;
40 int r,
g,
b, r1, g1, b1;
46 for (y = 0; y <
height; y += 2) {
47 for (x = 0; x <
width; x += 2) {
54 lum[0] = (
FIX(0.29900) * r +
FIX(0.58700) * g +
62 lum[1] = (
FIX(0.29900) * r +
FIX(0.58700) * g +
73 lum[0] = (
FIX(0.29900) * r +
FIX(0.58700) * g +
81 lum[1] = (
FIX(0.29900) * r +
FIX(0.58700) * g +
84 cb[0] = ((-
FIX(0.16874) * r1 -
FIX(0.33126) * g1 +
86 cr[0] = ((
FIX(0.50000) * r1 -
FIX(0.41869) * g1 -
100 #define DEFAULT_WIDTH 352 101 #define DEFAULT_HEIGHT 288 102 #define DEFAULT_NB_PICT 50 109 unsigned char *cb, *cr;
110 unsigned char *lum_tab, *cb_tab, *cr_tab;
112 lum_tab = malloc(w * h);
113 cb_tab = malloc(w * h / 4);
114 cr_tab = malloc(w * h / 4);
119 f = fopen(filename,
"wb");
120 fprintf(f,
"P5\n%d %d\n%d\n", w, h * 3 / 2, 255);
125 err_if(fwrite(lum_tab, 1, w * h, f) != w * h);
132 for (i = 0; i < h2; i++) {
133 err_if(fwrite(cb, 1, w2, f) != w2);
134 err_if(fwrite(cr, 1, w2, f) != w2);
140 for (i = 0; i < h2; i++) {
141 err_if(fwrite(cb, 1, w2, f) != w2);
144 for (i = 0; i < h2; i++) {
145 err_if(fwrite(cr, 1, w2, f) != w2);
162 if (x < 0 || x >=
width ||
static void put_pixel(int x, int y, int r, int g, int b)
static void rgb24_to_yuv420p(unsigned char *lum, unsigned char *cb, unsigned char *cr, unsigned char *src, int width, int height)
static unsigned char * rgb_tab
static void pgmyuv_save(const char *filename, int w, int h, unsigned char *rgb_tab)