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Get rid of some pointless bitmask/shifter variables in interplayvideo.c 

Originally committed as revision 18260 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-03-31 12:44:35 +00:00
parent 504ffed19f
commit e3114eb1bb
1 changed files with 21 additions and 32 deletions
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53
libavcodec/interplayvideo.c
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@ -199,7 +199,6 @@ static int ipvideo_decode_block_opcode_0x7(IpvideoContext *s)
int x, y;
unsigned char P0, P1;
unsigned int flags;
int bitmask;
/* 2-color encoding */
CHECK_STREAM_PTR(2);
@ -229,10 +228,9 @@ static int ipvideo_decode_block_opcode_0x7(IpvideoContext *s)
CHECK_STREAM_PTR(2);
flags = bytestream_get_le16(&s->stream_ptr);
bitmask = 0x0001;
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x += 2, bitmask <<= 1) {
if (flags & bitmask) {
for (x = 0; x < 8; x += 2, flags >>= 1) {
if (flags & 1) {
*(s->pixel_ptr + x) = P1;
*(s->pixel_ptr + x + 1) = P1;
*(s->pixel_ptr + s->stride + x) = P1;
@ -258,7 +256,6 @@ static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s)
unsigned char P[8];
unsigned char B[8];
unsigned int flags = 0;
unsigned int bitmask = 0;
unsigned char P0 = 0, P1 = 0;
int lower_half = 0;
@ -290,7 +287,6 @@ static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s)
((B[0] & 0x0F) ) | ((B[4] & 0x0F) << 4) |
((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
bitmask = 0x00000001;
lower_half = 0; /* still on top half */
} else if (y == 4) {
flags =
@ -298,11 +294,10 @@ static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s)
((B[2] & 0x0F) ) | ((B[6] & 0x0F) << 4) |
((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
bitmask = 0x00000001;
lower_half = 2;
}
for (x = 0; x < 8; x++, bitmask <<= 1) {
for (x = 0; x < 8; x++, flags >>= 1) {
/* get the pixel values ready for this quadrant */
if (x == 0) {
P0 = P[lower_half + 0];
@ -312,7 +307,7 @@ static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s)
P1 = P[lower_half + 5];
}
if (flags & bitmask)
if (flags & 1)
*s->pixel_ptr++ = P1;
else
*s->pixel_ptr++ = P0;
@ -343,17 +338,15 @@ static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s)
((B[0] & 0x0F) ) | ((B[4] & 0x0F) << 4) |
((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
bitmask = 0x00000001;
} else if (y == 4) {
flags =
((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) |
((B[2] & 0x0F) ) | ((B[6] & 0x0F) << 4) |
((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
bitmask = 0x00000001;
}
for (x = 0; x < 8; x++, bitmask <<= 1) {
for (x = 0; x < 8; x++, flags >>= 1) {
/* get the pixel values ready for this half */
if (x == 0) {
P0 = P[0];
@ -363,7 +356,7 @@ static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s)
P1 = P[3];
}
if (flags & bitmask)
if (flags & 1)
*s->pixel_ptr++ = P1;
else
*s->pixel_ptr++ = P0;
@ -376,6 +369,7 @@ static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s)
/* horizontal split; top & bottom halves are 2-color encoded */
for (y = 0; y < 8; y++) {
int bitmask;
flags = B[y];
if (y == 0) {
@ -407,7 +401,6 @@ static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s)
int x, y;
unsigned char P[4];
unsigned int flags = 0;
int shifter = 0;
unsigned char pix;
/* 4-color encoding */
@ -424,8 +417,8 @@ static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s)
for (y = 0; y < 8; y++) {
/* get the next set of 8 2-bit flags */
flags = bytestream_get_le16(&s->stream_ptr);
for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
*s->pixel_ptr++ = P[(flags >> shifter) & 0x03];
for (x = 0; x < 8; x++, flags >>= 2) {
*s->pixel_ptr++ = P[flags & 0x03];
}
s->pixel_ptr += s->line_inc;
}
@ -436,11 +429,10 @@ static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s)
CHECK_STREAM_PTR(4);
flags = bytestream_get_le32(&s->stream_ptr);
shifter = 0;
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x += 2, shifter += 2) {
pix = P[(flags >> shifter) & 0x03];
for (x = 0; x < 8; x += 2, flags >>= 2) {
pix = P[flags & 0x03];
*(s->pixel_ptr + x) = pix;
*(s->pixel_ptr + x + 1) = pix;
*(s->pixel_ptr + s->stride + x) = pix;
@ -458,10 +450,9 @@ static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s)
/* time to reload flags? */
if ((y == 0) || (y == 4)) {
flags = bytestream_get_le32(&s->stream_ptr);
shifter = 0;
}
for (x = 0; x < 8; x += 2, shifter += 2) {
pix = P[(flags >> shifter) & 0x03];
for (x = 0; x < 8; x += 2, flags >>= 2) {
pix = P[flags & 0x03];
*(s->pixel_ptr + x) = pix;
*(s->pixel_ptr + x + 1) = pix;
}
@ -477,10 +468,9 @@ static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s)
/* time to reload flags? */
if ((y == 0) || (y == 4)) {
flags = bytestream_get_le32(&s->stream_ptr);
shifter = 0;
}
for (x = 0; x < 8; x++, shifter += 2) {
pix = P[(flags >> shifter) & 0x03];
for (x = 0; x < 8; x++, flags >>= 2) {
pix = P[flags & 0x03];
*(s->pixel_ptr + x) = pix;
*(s->pixel_ptr + s->stride + x) = pix;
}
@ -498,7 +488,6 @@ static int ipvideo_decode_block_opcode_0xA(IpvideoContext *s)
unsigned char P[16];
unsigned char B[16];
int flags = 0;
int shifter = 0;
int index;
int split;
int lower_half;
@ -529,9 +518,9 @@ static int ipvideo_decode_block_opcode_0xA(IpvideoContext *s)
lower_half = (y >= 4) ? 4 : 0;
flags = (B[y + 8] << 8) | B[y];
for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
for (x = 0; x < 8; x++, flags >>= 2) {
split = (x >= 4) ? 8 : 0;
index = split + lower_half + ((flags >> shifter) & 0x03);
index = split + lower_half + (flags & 0x03);
*s->pixel_ptr++ = P[index];
}
@ -559,10 +548,10 @@ static int ipvideo_decode_block_opcode_0xA(IpvideoContext *s)
flags = (B[y + 8] << 8) | B[y];
split = 0;
for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
for (x = 0; x < 8; x++, flags >>= 2) {
if (x == 4)
split = 4;
*s->pixel_ptr++ = P[split + ((flags >> shifter) & 0x03)];
*s->pixel_ptr++ = P[split + (flags & 0x03)];
}
s->pixel_ptr += s->line_inc;
@ -578,8 +567,8 @@ static int ipvideo_decode_block_opcode_0xA(IpvideoContext *s)
if (y == 4)
split = 4;
for (x = 0, shifter = 0; x < 8; x++, shifter += 2)
*s->pixel_ptr++ = P[split + ((flags >> shifter) & 0x03)];
for (x = 0; x < 8; x++, flags >>= 2)
*s->pixel_ptr++ = P[split + (flags & 0x03)];
s->pixel_ptr += s->line_inc;
}