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x11vnc: round scaled width to multiple of 4 to make vncviewer happy.

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pull/1/head
runge 20 years ago
parent 88f1aa7075
commit b6caa102d1
2 changed files with 49 additions and 7 deletions
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5
x11vnc/ChangeLog
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@ -1,3 +1,8 @@
2004-06-28 Karl Runge <runge@karlrunge.com>
* round scaled width to multiple of 4 to make vncviewer happy.
* allow override of above ":n4" and allow 4 point interpolation
to be used even with shrinking ":in".
2004-06-27 Karl Runge <runge@karlrunge.com>
* speed up scaling a bit for slow machines (still all floating point)
* add no blending option (-scale fraction:nb)

51
x11vnc/x11vnc.c
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@ -156,7 +156,7 @@
#endif
/* date +'"lastmod: %Y-%m-%d";' */
char lastmod[] = "lastmod: 2004-06-26";
char lastmod[] = "lastmod: 2004-06-28";
/* X display info */
Display *dpy = 0;
@ -194,6 +194,8 @@ int rfb_bytes_per_line;
/* scaling info */
int scaling = 0;
int scaling_noblend = 0;
int scaling_nomult4 = 0;
int scaling_interpolate = 0;
double scale_fac = 1.0;
int scaled_x = 0, scaled_y = 0;
@ -3740,6 +3742,21 @@ void initialize_screen(int *argc, char **argv, XImage *fb) {
double eps = 0.000001;
width = (int) (width * scale_fac + eps);
height = (int) (height * scale_fac + eps);
if (!scaling_nomult4 && width % 4 != 0 && width > 2) {
/* reset width to be multiple of 4 */
int width0 = width;
if ((width+1) % 4 == 0) {
width = width+1;
} else if ((width-1) % 4 == 0) {
width = width-1;
} else if ((width+2) % 4 == 0) {
width = width+2;
}
rfbLog("reset scaled width %d -> %d to be a multiple of"
" 4 (to\n", width0, width);
rfbLog("make vncviewers happy). use -scale m/n:n4 to "
"disable.\n");
}
scaled_x = width;
scaled_y = height;
rfb_bytes_per_line = (main_bytes_per_line / fb->width) * width;
@ -4820,6 +4837,13 @@ static void scale_and_mark_rect(int X1, int Y1, int X2, int Y2) {
} else {
shrink = 0;
}
if (shrink && scaling_interpolate) {
/*
* User asked for interpolation scheme, presumably for
* small shrink.
*/
shrink = 0;
}
if (! screen->rfbServerFormat.trueColour) {
/*
@ -4886,8 +4910,10 @@ static void scale_and_mark_rect(int X1, int Y1, int X2, int Y2) {
break;
}
}
if (n != 0) {
if (! scaling_noblend && Nx % n == 0 && Ny % n == 0) {
if (scaling_noblend || ! shrink) {
;
} else if (n != 0) {
if (Nx % n == 0 && Ny % n == 0) {
rfbLog("scale_and_mark_rect: using constant "
"pixel weight speedup for 1/%d\n", n);
constant_weights = 1;
@ -5066,9 +5092,9 @@ static void scale_and_mark_rect(int X1, int Y1, int X2, int Y2) {
* use the masks:
*/
us = *( (unsigned short *) src );
pixave[0] += w * (us & main_red_mask);
pixave[1] += w * (us & main_green_mask);
pixave[2] += w * (us & main_blue_mask);
pixave[0] += w*(us & main_red_mask);
pixave[1] += w*(us & main_green_mask);
pixave[2] += w*(us & main_blue_mask);
}
src += Bpp;
}
@ -6615,7 +6641,12 @@ static void print_help(void) {
" number, alternatively the notation \"m/n\" may be used\n"
" to denote fractions, e.g. -scale 2/3. If you just want\n"
" a quick, rough scaling without blending, append \":nb\"\n"
" to \"fraction\" (e.g. -scale 1/3:nb)\n"
" to \"fraction\" (e.g. -scale 1/3:nb).\n"
"\n"
" For compatibility with vncviewers, the scaled width\n"
" is adjusted to be a multiple of 4. To disable this\n"
" use \":n4\". Separate multiple -scale \":\" options\n"
" via commas.\n"
"-visual n Experimental option: probably does not do what you\n"
" think. It simply *forces* the visual used for the\n"
" framebuffer; this may be a bad thing... It is useful for\n"
@ -7110,6 +7141,12 @@ int main(int argc, char* argv[]) {
if (strstr(p+1, "nb") != NULL) {
scaling_noblend = 1;
}
if (strstr(p+1, "n4") != NULL) {
scaling_nomult4 = 1;
}
if (strstr(p+1, "in") != NULL) {
scaling_interpolate = 1;
}
*p = '\0';
}
if (strchr(argv[i], '.') != NULL) {

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