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Static analysis fix: clean up unused variables and dead stores in blitters.

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This commit is contained in:
Ryan C. Gordon 2014-03-20 17:55:24 -04:00
parent 6d6fba4b0a
commit e177b1cc49
2 changed files with 277 additions and 168 deletions
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369
src/video/SDL_blit_auto.c
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76
src/video/sdlgenblit.pl
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@ -58,12 +58,22 @@ my %format_type = (
"BGRA8888" => "Uint32",
);
my %get_rgba_string_ignore_alpha = (
"RGB888" => "_R = (Uint8)(_pixel >> 16); _G = (Uint8)(_pixel >> 8); _B = (Uint8)_pixel;",
"BGR888" => "_B = (Uint8)(_pixel >> 16); _G = (Uint8)(_pixel >> 8); _R = (Uint8)_pixel;",
"ARGB8888" => "_R = (Uint8)(_pixel >> 16); _G = (Uint8)(_pixel >> 8); _B = (Uint8)_pixel;",
"RGBA8888" => "_R = (Uint8)(_pixel >> 24); _G = (Uint8)(_pixel >> 16); _B = (Uint8)(_pixel >> 8);",
"ABGR8888" => "_B = (Uint8)(_pixel >> 16); _G = (Uint8)(_pixel >> 8); _R = (Uint8)_pixel;",
"BGRA8888" => "_B = (Uint8)(_pixel >> 24); _G = (Uint8)(_pixel >> 16); _R = (Uint8)(_pixel >> 8);",
);
my %get_rgba_string = (
"RGB888" => "_R = (Uint8)(_pixel >> 16); _G = (Uint8)(_pixel >> 8); _B = (Uint8)_pixel; _A = 0xFF;",
"BGR888" => "_B = (Uint8)(_pixel >> 16); _G = (Uint8)(_pixel >> 8); _R = (Uint8)_pixel; _A = 0xFF;", "ARGB8888" => "_A = (Uint8)(_pixel >> 24); _R = (Uint8)(_pixel >> 16); _G = (Uint8)(_pixel >> 8); _B = (Uint8)_pixel;",
"RGBA8888" => "_R = (Uint8)(_pixel >> 24); _G = (Uint8)(_pixel >> 16); _B = (Uint8)(_pixel >> 8); _A = (Uint8)_pixel;",
"ABGR8888" => "_A = (Uint8)(_pixel >> 24); _B = (Uint8)(_pixel >> 16); _G = (Uint8)(_pixel >> 8); _R = (Uint8)_pixel;",
"BGRA8888" => "_B = (Uint8)(_pixel >> 24); _G = (Uint8)(_pixel >> 16); _R = (Uint8)(_pixel >> 8); _A = (Uint8)_pixel;",
"RGB888" => $get_rgba_string_ignore_alpha{"RGB888"} . " _A = 0xFF;",
"BGR888" => $get_rgba_string_ignore_alpha{"BGR888"} . " _A = 0xFF;",
"ARGB8888" => $get_rgba_string_ignore_alpha{"ARGB8888"} . " _A = (Uint8)(_pixel >> 24);",
"RGBA8888" => $get_rgba_string_ignore_alpha{"RGBA8888"} . " _A = (Uint8)_pixel;",
"ABGR8888" => $get_rgba_string_ignore_alpha{"ABGR8888"} . " _A = (Uint8)(_pixel >> 24);",
"BGRA8888" => $get_rgba_string_ignore_alpha{"BGRA8888"} . " _A = (Uint8)_pixel;",
);
my %set_rgba_string = (
@ -160,7 +170,15 @@ sub get_rgba
{
my $prefix = shift;
my $format = shift;
my $string = $get_rgba_string{$format};
my $ignore_alpha = shift;
my $string;
if ($ignore_alpha) {
$string = $get_rgba_string_ignore_alpha{$format};
} else {
$string = $get_rgba_string{$format};
}
$string =~ s/_/$prefix/g;
if ( $prefix ne "" ) {
print FILE <<__EOF__;
@ -196,6 +214,7 @@ sub output_copycore
my $blend = shift;
my $s = "";
my $d = "";
my $ignore_dst_alpha = 0;
# Nice and easy...
if ( $src eq $dst && !$modulate && !$blend ) {
@ -205,13 +224,17 @@ __EOF__
return;
}
if (not $dst =~ /A/) {
$ignore_dst_alpha = !$blend;
}
if ( $blend ) {
get_rgba("src", $src);
get_rgba("dst", $dst);
get_rgba("src", $src, $ignore_dst_alpha);
get_rgba("dst", $dst, $ignore_dst_alpha);
$s = "src";
$d = "dst";
} else {
get_rgba("", $src);
get_rgba("", $src, $ignore_dst_alpha);
}
if ( $modulate ) {
@ -221,10 +244,14 @@ __EOF__
${s}G = (${s}G * modulateG) / 255;
${s}B = (${s}B * modulateB) / 255;
}
__EOF__
if (not $ignore_dst_alpha) {
print FILE <<__EOF__;
if (flags & SDL_COPY_MODULATE_ALPHA) {
${s}A = (${s}A * modulateA) / 255;
}
__EOF__
}
}
if ( $blend ) {
print FILE <<__EOF__;
@ -306,6 +333,23 @@ __EOF__
int srcy, srcx;
int posy, posx;
int incy, incx;
__EOF__
# !!! FIXME: the script should just exclude in these cases.
if ( (!$blend) && ($modulate || $src ne $dst) ) {
print FILE <<__EOF__;
(void) A; /* not all formats use alpha. */
__EOF__
}
# !!! FIXME: the script should just exclude in these cases.
if ( $modulate ) {
print FILE <<__EOF__;
(void) modulateA; /* not all formats use alpha. */
__EOF__
}
print FILE <<__EOF__;
srcy = 0;
posy = 0;
@ -343,6 +387,20 @@ __EOF__
}
__EOF__
} else {
# !!! FIXME: the script should just exclude in these cases.
if ( (!$blend) && ($modulate || $src ne $dst) ) {
print FILE <<__EOF__;
(void) A; /* not all formats use alpha. */
__EOF__
}
# !!! FIXME: the script should just exclude in these cases.
if ( $modulate ) {
print FILE <<__EOF__;
(void) modulateA; /* not all formats use alpha. */
__EOF__
}
print FILE <<__EOF__;
while (info->dst_h--) {