j2k/jpeg2000: drop xi/yi0/1 from Jpeg2000Prec

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/j2k.c

@@ -243,10 +243,6 @@ int ff_j2k_init_component(Jpeg2000Component *comp,
 
         for (bandno = 0; bandno < reslevel->nbands; bandno++, gbandno++) {
             Jpeg2000Band *band = reslevel->band + bandno;
-            int precx, precy;
-            int x0, y0, x1, y1;
-            int xi0, yi0, xi1, yi1;
-            int cblkperprecw, cblkperprech;
             int cblkno, precno;
             int nb_precincts;
 
@@ -314,38 +310,6 @@ int ff_j2k_init_component(Jpeg2000Component *comp,
 
             nb_precincts = reslevel->num_precincts_x * reslevel->num_precincts_y;
 
-            y0 = band->coord[1][0];
-            y1 = ((band->coord[1][0] + (1<<reslevel->log2_prec_height)) & ~((1<<reslevel->log2_prec_height)-1)) - y0;
-            yi0 = 0;
-            yi1 = ff_jpeg2000_ceildivpow2(y1 - y0, codsty->log2_cblk_height) << codsty->log2_cblk_height;
-            yi1 = FFMIN(yi1, band->cblkny);
-            cblkperprech = 1<<(reslevel->log2_prec_height - codsty->log2_cblk_height);
-            for (precy = 0, precno = 0; precy < reslevel->num_precincts_y; precy++) {
-                for (precx = 0; precx < reslevel->num_precincts_x; precx++, precno++) {
-                    band->prec[precno].yi0 = yi0;
-                    band->prec[precno].yi1 = yi1;
-                }
-                yi1 += cblkperprech;
-                yi0 = yi1 - cblkperprech;
-                yi1 = FFMIN(yi1, band->cblkny);
-            }
-            x0 = band->coord[0][0];
-            x1 = ((band->coord[0][0] + (1<<reslevel->log2_prec_width)) & ~((1<<reslevel->log2_prec_width)-1)) - x0;
-            xi0 = 0;
-            xi1 = ff_jpeg2000_ceildivpow2(x1 - x0, codsty->log2_cblk_width) << codsty->log2_cblk_width;
-            xi1 = FFMIN(xi1, band->cblknx);
-
-            cblkperprecw = 1<<(reslevel->log2_prec_width - codsty->log2_cblk_width);
-            for (precx = 0, precno = 0; precx < reslevel->num_precincts_x; precx++) {
-                for (precy = 0; precy < reslevel->num_precincts_y; precy++, precno = 0) {
-                    Jpeg2000Prec *prec = band->prec + precno;
-                    prec->xi0 = xi0;
-                    prec->xi1 = xi1;
-                }
-                xi1 += cblkperprecw;
-                xi0 = xi1 - cblkperprecw;
-                xi1 = FFMIN(xi1, band->cblknx);
-            }
             for (precno = 0; precno < nb_precincts; precno++) {
                 Jpeg2000Prec *prec = band->prec + precno;
 
@@ -452,8 +416,8 @@ void ff_j2k_reinit(Jpeg2000Component *comp, Jpeg2000CodingStyle *codsty)
             Jpeg2000Band *band = rlevel->band + bandno;
             for(precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++) {
                 Jpeg2000Prec *prec = band->prec + precno;
-                tag_tree_zero(prec->zerobits, prec->xi1 - prec->xi0, prec->yi1 - prec->yi0);
-                tag_tree_zero(prec->cblkincl, prec->xi1 - prec->xi0, prec->yi1 - prec->yi0);
+                tag_tree_zero(prec->zerobits, prec->nb_codeblocks_width, prec->nb_codeblocks_height);
+                tag_tree_zero(prec->cblkincl, prec->nb_codeblocks_width, prec->nb_codeblocks_height);
                 for (cblkno = 0; cblkno < prec->nb_codeblocks_width * prec->nb_codeblocks_height; cblkno++) {
                     Jpeg2000Cblk *cblk = prec->cblk + cblkno;
                     cblk->length = 0;

libavcodec/j2k.h

@@ -167,7 +167,6 @@ typedef struct Jpeg2000Cblk {
 } Jpeg2000Cblk; // code block
 
 typedef struct Jpeg2000Prec {
-    uint16_t xi0, xi1, yi0, yi1; // codeblock indexes ([xi0, xi1))
     uint16_t nb_codeblocks_width;
     uint16_t nb_codeblocks_height;
     Jpeg2000TgtNode *zerobits;

libavcodec/j2kenc.c

@@ -668,14 +668,14 @@ static int encode_packet(Jpeg2000EncoderContext *s, Jpeg2000ResLevel *rlevel, in
         Jpeg2000Band *band = rlevel->band + bandno;
         Jpeg2000Prec *prec = band->prec + precno;
         int yi, xi, pos;
-        int cblknw = prec->xi1 - prec->xi0;
+        int cblknw = prec->nb_codeblocks_width;
 
         if (band->coord[0][0] == band->coord[0][1]
         ||  band->coord[1][0] == band->coord[1][1])
             continue;
 
-        for (pos=0, yi = prec->yi0; yi < prec->yi1; yi++){
-            for (xi = prec->xi0; xi < prec->xi1; xi++, pos++){
+        for (pos=0, yi = 0; yi < prec->nb_codeblocks_height; yi++){
+            for (xi = 0; xi < cblknw; xi++, pos++){
                 prec->cblkincl[pos].val = prec->cblk[yi * cblknw + xi].ninclpasses == 0;
                 tag_tree_update(prec->cblkincl + pos);
                 prec->zerobits[pos].val = expn[bandno] + numgbits - 1 - prec->cblk[yi * cblknw + xi].nonzerobits;
@@ -683,8 +683,8 @@ static int encode_packet(Jpeg2000EncoderContext *s, Jpeg2000ResLevel *rlevel, in
             }
         }
 
-        for (pos=0, yi = prec->yi0; yi < prec->yi1; yi++){
-            for (xi = prec->xi0; xi < prec->xi1; xi++, pos++){
+        for (pos=0, yi = 0; yi < prec->nb_codeblocks_height; yi++){
+            for (xi = 0; xi < cblknw; xi++, pos++){
                 int pad = 0, llen, length;
                 Jpeg2000Cblk *cblk = prec->cblk + yi * cblknw + xi;
 
@@ -717,10 +717,10 @@ static int encode_packet(Jpeg2000EncoderContext *s, Jpeg2000ResLevel *rlevel, in
     for (bandno = 0; bandno < rlevel->nbands; bandno++){
         Jpeg2000Band *band = rlevel->band + bandno;
         Jpeg2000Prec *prec = band->prec + precno;
-        int yi, cblknw = prec->xi1 - prec->xi0;
-        for (yi = prec->yi0; yi < prec->yi1; yi++){
+        int yi, cblknw = prec->nb_codeblocks_width;
+        for (yi =0; yi < prec->nb_codeblocks_height; yi++){
             int xi;
-            for (xi = prec->xi0; xi < prec->xi1; xi++){
+            for (xi = 0; xi < cblknw; xi++){
                 Jpeg2000Cblk *cblk = prec->cblk + yi * cblknw + xi;
                 if (cblk->ninclpasses){
                     if (s->buf_end - s->buf < cblk->passes[cblk->ninclpasses-1].rate)

libavcodec/jpeg2000.h

@@ -168,7 +168,6 @@ typedef struct Jpeg2000Cblk {
 } Jpeg2000Cblk; // code block
 
 typedef struct Jpeg2000Prec {
-    uint16_t xi0, yi0; // codeblock indexes ([xi0, xi1))
     uint16_t nb_codeblocks_width;
     uint16_t nb_codeblocks_height;
     Jpeg2000TgtNode *zerobits;

libavcodec/jpeg2000dec.c

@@ -605,8 +605,6 @@ static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s,
         if (band->coord[0][0] == band->coord[0][1] ||
             band->coord[1][0] == band->coord[1][1])
             continue;
-        prec->yi0 = 0;
-        prec->xi0 = 0;
         nb_code_blocks =  prec->nb_codeblocks_height *
                           prec->nb_codeblocks_width;
         for (cblkno = 0; cblkno < nb_code_blocks; cblkno++) {