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ffmpeg.wasm-core
Commit 8b1032c9 authored by Jordi Ortiz's avatar Jordi Ortiz Committed by Michael Niedermayer
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dwt: Code make up, removed gotos 

(cherry picked from commit 14880406e1277cef91d9b22a4d9b3bf91f8ea4ca)
Signed-off-by: 's avatarMichael Niedermayer <michaelni@gmx.at>
parent db3463e9
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Showing with 204 additions and 203 deletions
libavcodec/dwt.c
View file @ 8b1032c9
......@@ -47,7 +47,6 @@ IDWTELEM * ff_slice_buffer_load_line(slice_buffer * buf, int line)
IDWTELEM * buffer;
assert(buf->data_stack_top >= 0);
// assert(!buf->line[line]);
if (buf->line[line])
return buf->line[line];
......@@ -94,8 +93,8 @@ void ff_slice_buffer_destroy(slice_buffer * buf)
static inline int mirror(int v, int m){
while((unsigned)v > (unsigned)m){
v=-v;
if(v<0) v+= 2*m;
v = -v;
if(v < 0) v+= 2*m;
}
return v;
}
......@@ -105,29 +104,29 @@ lift(DWTELEM *dst, DWTELEM *src, DWTELEM *ref,
int dst_step, int src_step, int ref_step,
int width, int mul, int add, int shift,
int highpass, int inverse){
const int mirror_left= !highpass;
const int mirror_right= (width&1) ^ highpass;
const int w= (width>>1) - 1 + (highpass & width);
const int mirror_left = !highpass;
const int mirror_right = (width & 1) ^ highpass;
const int w = (width >> 1) - 1 + (highpass & width);
int i;
#define LIFT(src, ref, inv) ((src) + ((inv) ? - (ref) : + (ref)))
if(mirror_left){
dst[0] = LIFT(src[0], ((mul*2*ref[0]+add)>>shift), inverse);
dst[0] = LIFT(src[0], ((mul * 2 * ref[0] + add) >> shift), inverse);
dst += dst_step;
src += src_step;
}
for(i=0; i<w; i++){
dst[i*dst_step] =
LIFT(src[i*src_step],
((mul*(ref[i*ref_step] + ref[(i+1)*ref_step])+add)>>shift),
dst[i * dst_step] =
LIFT(src[i * src_step],
((mul * (ref[i * ref_step] + ref[(i + 1) * ref_step]) + add) >> shift),
inverse);
}
if(mirror_right){
dst[w*dst_step] =
LIFT(src[w*src_step],
((mul*2*ref[w*ref_step]+add)>>shift),
dst[w * dst_step] =
LIFT(src[w * src_step],
((mul * 2 * ref[w * ref_step] + add) >> shift),
inverse);
}
}
......@@ -137,29 +136,32 @@ inv_lift(IDWTELEM *dst, IDWTELEM *src, IDWTELEM *ref,
int dst_step, int src_step, int ref_step,
int width, int mul, int add, int shift,
int highpass, int inverse){
const int mirror_left= !highpass;
const int mirror_right= (width&1) ^ highpass;
const int w= (width>>1) - 1 + (highpass & width);
const int mirror_left = !highpass;
const int mirror_right = (width&1) ^ highpass;
const int w = (width >> 1) - 1 + (highpass & width);
int i;
#define LIFT(src, ref, inv) ((src) + ((inv) ? - (ref) : + (ref)))
if(mirror_left){
dst[0] = LIFT(src[0], ((mul*2*ref[0]+add)>>shift), inverse);
dst[0] =
LIFT(src[0],
((mul * 2 * ref[0] + add) >> shift),
inverse);
dst += dst_step;
src += src_step;
}
for(i=0; i<w; i++){
dst[i*dst_step] =
LIFT(src[i*src_step],
((mul*(ref[i*ref_step] + ref[(i+1)*ref_step])+add)>>shift),
for(i = 0; i < w; i++){
dst[i * dst_step] =
LIFT(src[i * src_step],
((mul * (ref[i * ref_step] + ref[(i + 1) * ref_step]) + add) >> shift),
inverse);
}
if(mirror_right){
dst[w*dst_step] =
LIFT(src[w*src_step],
((mul*2*ref[w*ref_step]+add)>>shift),
dst[w * dst_step] =
LIFT(src[w * src_step],
((mul * 2 * ref[w * ref_step] + add) >> shift),
inverse);
}
}
......@@ -170,32 +172,32 @@ liftS(DWTELEM *dst, DWTELEM *src, DWTELEM *ref,
int dst_step, int src_step, int ref_step,
int width, int mul, int add, int shift,
int highpass, int inverse){
const int mirror_left= !highpass;
const int mirror_right= (width&1) ^ highpass;
const int w= (width>>1) - 1 + (highpass & width);
const int mirror_left = !highpass;
const int mirror_right = (width&1) ^ highpass;
const int w = (width >> 1) - 1 + (highpass & width);
int i;
assert(shift == 4);
#define LIFTS(src, ref, inv) \
((inv) ? \
(src) + (((ref) + 4*(src))>>shift): \
-((-16*(src) + (ref) + add/4 + 1 + (5<<25))/(5*4) - (1<<23)))
(src) + (((ref) + 4 * (src)) >> shift): \
-((-16 * (src) + (ref) + add / 4 + 1 + (5 << 25)) / (5 * 4) - (1 << 23)))
if(mirror_left){
dst[0] = LIFTS(src[0], mul*2*ref[0]+add, inverse);
dst[0] = LIFTS(src[0], mul * 2 * ref[0] + add, inverse);
dst += dst_step;
src += src_step;
}
for(i=0; i<w; i++){
dst[i*dst_step] =
LIFTS(src[i*src_step],
mul*(ref[i*ref_step] + ref[(i+1)*ref_step])+add,
for(i = 0; i < w; i++){
dst[i * dst_step] =
LIFTS(src[i * src_step],
mul * (ref[i * ref_step] + ref[(i+1) * ref_step]) + add,
inverse);
}
if(mirror_right){
dst[w*dst_step] =
LIFTS(src[w*src_step], mul*2*ref[w*ref_step]+add, inverse);
dst[w * dst_step] =
LIFTS(src[w * src_step], mul * 2 * ref[w * ref_step] + add, inverse);
}
}
static av_always_inline void
......@@ -203,156 +205,156 @@ inv_liftS(IDWTELEM *dst, IDWTELEM *src, IDWTELEM *ref,
int dst_step, int src_step, int ref_step,
int width, int mul, int add, int shift,
int highpass, int inverse){
const int mirror_left= !highpass;
const int mirror_right= (width&1) ^ highpass;
const int w= (width>>1) - 1 + (highpass & width);
const int mirror_left = !highpass;
const int mirror_right = (width&1) ^ highpass;
const int w = (width >> 1) - 1 + (highpass & width);
int i;
assert(shift == 4);
#define LIFTS(src, ref, inv) \
((inv) ? \
(src) + (((ref) + 4*(src))>>shift): \
-((-16*(src) + (ref) + add/4 + 1 + (5<<25))/(5*4) - (1<<23)))
(src) + (((ref) + 4 * (src)) >> shift): \
-((-16 * (src) + (ref) + add / 4 + 1 + (5 << 25)) / (5 * 4) - (1 << 23)))
if(mirror_left){
dst[0] = LIFTS(src[0], mul*2*ref[0]+add, inverse);
dst[0] = LIFTS(src[0], mul * 2 * ref[0] + add, inverse);
dst += dst_step;
src += src_step;
}
for(i=0; i<w; i++){
dst[i*dst_step] =
LIFTS(src[i*src_step],
mul*(ref[i*ref_step] + ref[(i+1)*ref_step])+add,
for(i = 0; i < w; i++){
dst[i * dst_step] =
LIFTS(src[i * src_step],
mul * (ref[i * ref_step] + ref[(i+1) * ref_step]) + add,
inverse);
}
if(mirror_right){
dst[w*dst_step] =
LIFTS(src[w*src_step], mul*2*ref[w*ref_step]+add, inverse);
dst[w * dst_step] =
LIFTS(src[w * src_step], mul * 2 * ref[w * ref_step] + add, inverse);
}
}
#endif /* ! liftS */
static void horizontal_decompose53i(DWTELEM *b, int width){
DWTELEM temp[width];
const int width2= width>>1;
const int width2 = width>>1;
const int w2 = (width+1)>>1;
int x;
const int w2= (width+1)>>1;
for(x=0; x<width2; x++){
temp[x ]= b[2*x ];
temp[x+w2]= b[2*x + 1];
for(x = 0; x < width2; x++){
temp[x ] = b[2 * x ];
temp[x+w2] = b[2 * x + 1];
}
if(width&1)
temp[x ]= b[2*x ];
if(width & 1)
temp[x ] = b[2 * x ];
#if 0
{
int A1,A2,A3,A4;
A2= temp[1 ];
A4= temp[0 ];
A1= temp[0+width2];
A1 -= (A2 + A4)>>1;
A4 += (A1 + 1)>>1;
b[0+width2] = A1;
A2 = temp[1 ];
A4 = temp[0 ];
A1 = temp[0+width2];
A1 -= (A2 + A4) >> 1;
A4 += (A1 + 1) >> 1;
b[0 + width2] = A1;
b[0 ] = A4;
for(x=1; x+1<width2; x+=2){
A3= temp[x+width2];
A4= temp[x+1 ];
A3 -= (A2 + A4)>>1;
A2 += (A1 + A3 + 2)>>2;
b[x+width2] = A3;
for(x = 1; x + 1 < width2; x += 2){
A3 = temp[x + width2];
A4 = temp[x + 1 ];
A3 -= (A2 + A4) >> 1;
A2 += (A1 + A3 + 2) >> 2;
b[x + width2] = A3;
b[x ] = A2;
A1= temp[x+1+width2];
A2= temp[x+2 ];
A1 -= (A2 + A4)>>1;
A4 += (A1 + A3 + 2)>>2;
b[x+1+width2] = A1;
b[x+1 ] = A4;
A1 = temp[x + 1 + width2];
A2 = temp[x + 2 ];
A1 -= (A2 + A4) >> 1;
A4 += (A1 + A3 + 2) >> 2;
b[x + 1 + width2] = A1;
b[x + 1 ] = A4;
}
A3= temp[width-1];
A3 = temp[width - 1];
A3 -= A2;
A2 += (A1 + A3 + 2)>>2;
A2 += (A1 + A3 + 2) >> 2;
b[width -1] = A3;
b[width2-1] = A2;
}
#else
lift(b+w2, temp+w2, temp, 1, 1, 1, width, -1, 0, 1, 1, 0);
lift(b , temp , b+w2, 1, 1, 1, width, 1, 2, 2, 0, 0);
lift(b + w2, temp + w2, temp, 1, 1, 1, width, -1, 0, 1, 1, 0);
lift(b , temp , b + w2, 1, 1, 1, width, 1, 2, 2, 0, 0);
#endif /* 0 */
}
static void vertical_decompose53iH0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
int i;
for(i=0; i<width; i++){
b1[i] -= (b0[i] + b2[i])>>1;
for(i = 0; i < width; i++){
b1[i] -= (b0[i] + b2[i]) >> 1;
}
}
static void vertical_decompose53iL0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
int i;
for(i=0; i<width; i++){
b1[i] += (b0[i] + b2[i] + 2)>>2;
for(i = 0; i < width; i++){
b1[i] += (b0[i] + b2[i] + 2) >> 2;
}
}
static void spatial_decompose53i(DWTELEM *buffer, int width, int height, int stride){
int y;
DWTELEM *b0= buffer + mirror(-2-1, height-1)*stride;
DWTELEM *b1= buffer + mirror(-2 , height-1)*stride;
DWTELEM *b0 = buffer + mirror(-2 - 1, height-1)*stride;
DWTELEM *b1 = buffer + mirror(-2 , height-1)*stride;
for(y=-2; y<height; y+=2){
DWTELEM *b2= buffer + mirror(y+1, height-1)*stride;
DWTELEM *b3= buffer + mirror(y+2, height-1)*stride;
for(y = -2; y < height; y += 2){
DWTELEM *b2 = buffer + mirror(y + 1, height-1) * stride;
DWTELEM *b3 = buffer + mirror(y + 2, height-1) * stride;
if(y+1<(unsigned)height) horizontal_decompose53i(b2, width);
if(y+2<(unsigned)height) horizontal_decompose53i(b3, width);
if(y + 1 < (unsigned)height) horizontal_decompose53i(b2, width);
if(y + 2 < (unsigned)height) horizontal_decompose53i(b3, width);
if(y+1<(unsigned)height) vertical_decompose53iH0(b1, b2, b3, width);
if(y+0<(unsigned)height) vertical_decompose53iL0(b0, b1, b2, width);
if(y + 1 < (unsigned)height) vertical_decompose53iH0(b1, b2, b3, width);
if(y + 0 < (unsigned)height) vertical_decompose53iL0(b0, b1, b2, width);
b0=b2;
b1=b3;
b0 = b2;
b1 = b3;
}
}
static void horizontal_decompose97i(DWTELEM *b, int width){
DWTELEM temp[width];
const int w2= (width+1)>>1;
const int w2 = (width+1)>>1;
lift (temp+w2, b +1, b , 1, 2, 2, width, W_AM, W_AO, W_AS, 1, 1);
liftS(temp , b , temp+w2, 1, 2, 1, width, W_BM, W_BO, W_BS, 0, 0);
lift (b +w2, temp+w2, temp , 1, 1, 1, width, W_CM, W_CO, W_CS, 1, 0);
lift (b , temp , b +w2, 1, 1, 1, width, W_DM, W_DO, W_DS, 0, 0);
lift (temp + w2, b + 1 , b , 1, 2, 2, width, W_AM, W_AO, W_AS, 1, 1);
liftS(temp , b , temp + w2, 1, 2, 1, width, W_BM, W_BO, W_BS, 0, 0);
lift (b + w2, temp + w2, temp , 1, 1, 1, width, W_CM, W_CO, W_CS, 1, 0);
lift (b , temp , b + w2, 1, 1, 1, width, W_DM, W_DO, W_DS, 0, 0);
}
static void vertical_decompose97iH0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
int i;
for(i=0; i<width; i++){
b1[i] -= (W_AM*(b0[i] + b2[i])+W_AO)>>W_AS;
for(i = 0; i < width; i++){
b1[i] -= (W_AM * (b0[i] + b2[i]) + W_AO) >> W_AS;
}
}
static void vertical_decompose97iH1(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
int i;
for(i=0; i<width; i++){
b1[i] += (W_CM*(b0[i] + b2[i])+W_CO)>>W_CS;
for(i=0; i < width; i++){
b1[i] += (W_CM * (b0[i] + b2[i]) + W_CO) >> W_CS;
}
}
static void vertical_decompose97iL0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
int i;
for(i=0; i<width; i++){
for(i = 0; i < width; i++){
#ifdef liftS
b1[i] -= (W_BM*(b0[i] + b2[i])+W_BO)>>W_BS;
b1[i] -= (W_BM * (b0[i] + b2[i]) + W_BO) >> W_BS;
#else
b1[i] = (16*4*b1[i] - 4*(b0[i] + b2[i]) + W_BO*5 + (5<<27)) / (5*16) - (1<<23);
b1[i] = (16 * 4 * b1[i] - 4 * (b0[i] + b2[i]) + W_BO * 5 + (5 << 27)) / (5 * 16) - (1 << 23);
#endif
}
}
......@@ -360,123 +362,122 @@ static void vertical_decompose97iL0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int w
static void vertical_decompose97iL1(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
int i;
for(i=0; i<width; i++){
b1[i] += (W_DM*(b0[i] + b2[i])+W_DO)>>W_DS;
for(i = 0; i < width; i++){
b1[i] += (W_DM * (b0[i] + b2[i]) + W_DO) >> W_DS;
}
}
static void spatial_decompose97i(DWTELEM *buffer, int width, int height, int stride){
int y;
DWTELEM *b0= buffer + mirror(-4-1, height-1)*stride;
DWTELEM *b1= buffer + mirror(-4 , height-1)*stride;
DWTELEM *b2= buffer + mirror(-4+1, height-1)*stride;
DWTELEM *b3= buffer + mirror(-4+2, height-1)*stride;
DWTELEM *b0 = buffer + mirror(-4 - 1, height-1) * stride;
DWTELEM *b1 = buffer + mirror(-4 , height-1) * stride;
DWTELEM *b2 = buffer + mirror(-4 + 1, height-1) * stride;
DWTELEM *b3 = buffer + mirror(-4 + 2, height-1) * stride;
for(y=-4; y<height; y+=2){
DWTELEM *b4= buffer + mirror(y+3, height-1)*stride;
DWTELEM *b5= buffer + mirror(y+4, height-1)*stride;
for(y = -4; y < height; y += 2){
DWTELEM *b4 = buffer + mirror(y + 3, height-1) * stride;
DWTELEM *b5 = buffer + mirror(y + 4, height-1) * stride;
if(y+3<(unsigned)height) horizontal_decompose97i(b4, width);
if(y+4<(unsigned)height) horizontal_decompose97i(b5, width);
if(y + 3 < (unsigned)height) horizontal_decompose97i(b4, width);
if(y + 4 < (unsigned)height) horizontal_decompose97i(b5, width);
if(y+3<(unsigned)height) vertical_decompose97iH0(b3, b4, b5, width);
if(y+2<(unsigned)height) vertical_decompose97iL0(b2, b3, b4, width);
if(y+1<(unsigned)height) vertical_decompose97iH1(b1, b2, b3, width);
if(y+0<(unsigned)height) vertical_decompose97iL1(b0, b1, b2, width);
if(y + 3 < (unsigned)height) vertical_decompose97iH0(b3, b4, b5, width);
if(y + 2 < (unsigned)height) vertical_decompose97iL0(b2, b3, b4, width);
if(y + 1 < (unsigned)height) vertical_decompose97iH1(b1, b2, b3, width);
if(y + 0 < (unsigned)height) vertical_decompose97iL1(b0, b1, b2, width);
b0=b2;
b1=b3;
b2=b4;
b3=b5;
b0 = b2;
b1 = b3;
b2 = b4;
b3 = b5;
}
}
void ff_spatial_dwt(DWTELEM *buffer, int width, int height, int stride, int type, int decomposition_count){
int level;
for(level=0; level<decomposition_count; level++){
for(level = 0; level < decomposition_count; level++){
switch(type){
case DWT_97: spatial_decompose97i(buffer, width>>level, height>>level, stride<<level); break;
case DWT_53: spatial_decompose53i(buffer, width>>level, height>>level, stride<<level); break;
case DWT_97: spatial_decompose97i(buffer, width >> level, height >> level, stride << level); break;
case DWT_53: spatial_decompose53i(buffer, width >> level, height >> level, stride << level); break;
}
}
}
static void horizontal_compose53i(IDWTELEM *b, int width){
IDWTELEM temp[width];
const int width2= width>>1;
const int w2= (width+1)>>1;
const int width2 = width >> 1;
const int w2 = (width + 1) >> 1;
int x;
for(x=0; x<width2; x++){
temp[2*x ]= b[x ];
temp[2*x + 1]= b[x+w2];
for(x = 0; x < width2; x++){
temp[2 * x ] = b[x ];
temp[2 * x + 1] = b[x + w2];
}
if(width&1)
temp[2*x ]= b[x ];
if(width & 1)
temp[2 * x ] = b[x ];
b[0] = temp[0] - ((temp[1]+1)>>1);
for(x=2; x<width-1; x+=2){
b[x ] = temp[x ] - ((temp[x-1] + temp[x+1]+2)>>2);
b[x-1] = temp[x-1] + ((b [x-2] + b [x ]+1)>>1);
b[0] = temp[0] - ((temp[1] + 1) >> 1);
for(x = 2; x < width - 1; x += 2){
b[x ] = temp[x ] - ((temp[x - 1] + temp[x + 1] + 2) >> 2);
b[x - 1] = temp[x - 1] + ((b [x - 2] + b [x ] + 1) >> 1);
}
if(width&1){
b[x ] = temp[x ] - ((temp[x-1]+1)>>1);
b[x-1] = temp[x-1] + ((b [x-2] + b [x ]+1)>>1);
if(width & 1){
b[x ] = temp[x ] - ((temp[x - 1] + 1) >> 1);
b[x - 1] = temp[x - 1] + ((b [x - 2] + b [x ] + 1) >> 1);
}else
b[x-1] = temp[x-1] + b[x-2];
b[x - 1] = temp[x - 1] + b[x - 2];
}
static void vertical_compose53iH0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2, int width){
int i;
for(i=0; i<width; i++){
b1[i] += (b0[i] + b2[i])>>1;
for(i = 0; i < width; i++){
b1[i] += (b0[i] + b2[i]) >> 1;
}
}
static void vertical_compose53iL0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2, int width){
int i;
for(i=0; i<width; i++){
b1[i] -= (b0[i] + b2[i] + 2)>>2;
for(i = 0; i < width; i++){
b1[i] -= (b0[i] + b2[i] + 2) >> 2;
}
}
static void spatial_compose53i_buffered_init(DWTCompose *cs, slice_buffer * sb, int height, int stride_line){
cs->b0 = slice_buffer_get_line(sb, mirror(-1-1, height-1) * stride_line);
cs->b1 = slice_buffer_get_line(sb, mirror(-1 , height-1) * stride_line);
cs->b0 = slice_buffer_get_line(sb, mirror(-1-1, height - 1) * stride_line);
cs->b1 = slice_buffer_get_line(sb, mirror(-1 , height - 1) * stride_line);
cs->y = -1;
}
static void spatial_compose53i_init(DWTCompose *cs, IDWTELEM *buffer, int height, int stride){
cs->b0 = buffer + mirror(-1-1, height-1)*stride;
cs->b1 = buffer + mirror(-1 , height-1)*stride;
cs->b0 = buffer + mirror(-1-1, height - 1) * stride;
cs->b1 = buffer + mirror(-1 , height - 1) * stride;
cs->y = -1;
}
static void spatial_compose53i_dy_buffered(DWTCompose *cs, slice_buffer * sb, int width, int height, int stride_line){
int y= cs->y;
IDWTELEM *b0= cs->b0;
IDWTELEM *b1= cs->b1;
IDWTELEM *b2= slice_buffer_get_line(sb, mirror(y+1, height-1) * stride_line);
IDWTELEM *b3= slice_buffer_get_line(sb, mirror(y+2, height-1) * stride_line);
int y = cs->y;
IDWTELEM *b0 = cs->b0;
IDWTELEM *b1 = cs->b1;
IDWTELEM *b2 = slice_buffer_get_line(sb, mirror(y + 1, height-1) * stride_line);
IDWTELEM *b3 = slice_buffer_get_line(sb, mirror(y + 2, height-1) * stride_line);
if(y+1<(unsigned)height && y<(unsigned)height){
if(y + 1 < (unsigned)height && y < (unsigned)height){
int x;
for(x=0; x<width; x++){
b2[x] -= (b1[x] + b3[x] + 2)>>2;
b1[x] += (b0[x] + b2[x])>>1;
for(x = 0; x < width; x++){
b2[x] -= (b1[x] + b3[x] + 2) >> 2;
b1[x] += (b0[x] + b2[x]) >> 1;
}
}else{
if(y+1<(unsigned)height) vertical_compose53iL0(b1, b2, b3, width);
if(y+0<(unsigned)height) vertical_compose53iH0(b0, b1, b2, width);
if(y + 1 < (unsigned)height) vertical_compose53iL0(b1, b2, b3, width);
if(y + 0 < (unsigned)height) vertical_compose53iH0(b0, b1, b2, width);
}
if(y-1<(unsigned)height) horizontal_compose53i(b0, width);
if(y+0<(unsigned)height) horizontal_compose53i(b1, width);
if(y - 1 <(unsigned)height) horizontal_compose53i(b0, width);
if(y + 0 <(unsigned)height) horizontal_compose53i(b1, width);
cs->b0 = b2;
cs->b1 = b3;
......@@ -484,17 +485,17 @@ static void spatial_compose53i_dy_buffered(DWTCompose *cs, slice_buffer * sb, in
}
static void spatial_compose53i_dy(DWTCompose *cs, IDWTELEM *buffer, int width, int height, int stride){
int y= cs->y;
IDWTELEM *b0= cs->b0;
IDWTELEM *b1= cs->b1;
IDWTELEM *b2= buffer + mirror(y+1, height-1)*stride;
IDWTELEM *b3= buffer + mirror(y+2, height-1)*stride;
int y = cs->y;
IDWTELEM *b0 = cs->b0;
IDWTELEM *b1 = cs->b1;
IDWTELEM *b2 = buffer + mirror(y + 1, height - 1) * stride;
IDWTELEM *b3 = buffer + mirror(y + 2, height - 1) * stride;
if(y+1<(unsigned)height) vertical_compose53iL0(b1, b2, b3, width);
if(y+0<(unsigned)height) vertical_compose53iH0(b0, b1, b2, width);
if(y + 1 < (unsigned)height) vertical_compose53iL0(b1, b2, b3, width);
if(y + 0 < (unsigned)height) vertical_compose53iH0(b0, b1, b2, width);
if(y-1<(unsigned)height) horizontal_compose53i(b0, width);
if(y+0<(unsigned)height) horizontal_compose53i(b1, width);
if(y - 1 < (unsigned)height) horizontal_compose53i(b0, width);
if(y + 0 < (unsigned)height) horizontal_compose53i(b1, width);
cs->b0 = b2;
cs->b1 = b3;
......@@ -511,22 +512,22 @@ static void av_unused spatial_compose53i(IDWTELEM *buffer, int width, int height
void ff_snow_horizontal_compose97i(IDWTELEM *b, int width){
IDWTELEM temp[width];
const int w2= (width+1)>>1;
const int w2 = (width + 1) >> 1;
#if 0 //maybe more understadable but slower
inv_lift (temp , b , b +w2, 2, 1, 1, width, W_DM, W_DO, W_DS, 0, 1);
inv_lift (temp+1 , b +w2, temp , 2, 1, 2, width, W_CM, W_CO, W_CS, 1, 1);
inv_lift (temp , b , b + w2, 2, 1, 1, width, W_DM, W_DO, W_DS, 0, 1);
inv_lift (temp + 1, b + w2, temp , 2, 1, 2, width, W_CM, W_CO, W_CS, 1, 1);
inv_liftS(b , temp , temp+1 , 2, 2, 2, width, W_BM, W_BO, W_BS, 0, 1);
inv_lift (b+1 , temp+1 , b , 2, 2, 2, width, W_AM, W_AO, W_AS, 1, 0);
inv_liftS(b ,temp ,temp + 1, 2, 2, 2, width, W_BM, W_BO, W_BS, 0, 1);
inv_lift (b + 1 ,temp + 1,b , 2, 2, 2, width, W_AM, W_AO, W_AS, 1, 0);
#else
int x;
temp[0] = b[0] - ((3*b[w2]+2)>>2);
for(x=1; x<(width>>1); x++){
temp[2*x ] = b[x ] - ((3*(b [x+w2-1] + b[x+w2])+4)>>3);
temp[2*x-1] = b[x+w2-1] - temp[2*x-2] - temp[2*x];
temp[0] = b[0] - ((3 * b[w2] + 2) >> 2);
for(x = 1; x < (width >> 1); x++){
temp[2 * x ] = b[x ] - (( 3 * (b [ x + w2 - 1] + b[x + w2]) + 4) >> 3);
temp[2 * x - 1] = b[x + w2 - 1] - temp[2 * x - 2] - temp[2 * x];
}
if(width&1){
if(width & 1){
temp[2*x ] = b[x ] - ((3*b [x+w2-1]+2)>>2);
temp[2*x-1] = b[x+w2-1] - temp[2*x-2] - temp[2*x];
}else
......
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