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303 lines
7.6 KiB
303 lines
7.6 KiB
3 months ago
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/*
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* Image Library -- Duplicates Comparison
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*
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* (c) 2006 Pavel Charvat <pchar@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#undef LOCAL_DEBUG
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#include <ucw/lib.h>
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#include <ucw/mempool.h>
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#include <ucw/fastbuf.h>
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#include <images/images.h>
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#include <images/duplicates.h>
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#include <fcntl.h>
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static inline uint
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err (int a, int b)
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{
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a -= b;
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return a * a;
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}
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static inline u64
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err_sum(byte *pos1, byte *pos2, uint count)
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{
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uint e64 = 0;
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while (count--)
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{
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uint e = err(*pos1++, *pos2++);
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e += err(*pos1++, *pos2++);
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e += err(*pos1++, *pos2++);
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e64 += e;
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}
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return e64;
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}
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static inline u64
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err_sum_transformed(byte *pos1, byte *pos2, uint cols, uint rows, int row_step_1, int col_step_2, int row_step_2)
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{
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DBG("err_sum_transformed(pos1=%p pos2=%p cols=%u rows=%u row_step_1=%d col_step_2=%d row_step_2=%d)",
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pos1, pos2, cols, rows, row_step_1, col_step_2, row_step_2);
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u64 e64 = 0;
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for (uint j = rows; j--; )
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{
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byte *p1 = pos1;
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byte *p2 = pos2;
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uint e = 0;
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for (uint i = cols; i--; )
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{
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e += err(p1[0], p2[0]);
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e += err(p1[1], p2[1]);
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e += err(p1[2], p2[2]);
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p1 += 3;
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p2 += col_step_2;
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}
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pos1 += row_step_1;
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pos2 += row_step_2;
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e64 += e;
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}
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return e64;
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}
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static inline int
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aspect_ratio_test(struct image_dup_context *ctx, uint cols1, uint rows1, uint cols2, uint rows2)
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{
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DBG("aspect_ratio_test(cols1=%u rows1=%u cols2=%u rows2=%u)", cols1, rows1, cols2, rows2);
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uint r1 = cols1 * rows2;
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uint r2 = rows1 * cols2;
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return
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r1 <= ((r2 * ctx->ratio_threshold) >> 7) &&
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r2 <= ((r1 * ctx->ratio_threshold) >> 7);
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}
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static inline int
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average_compare(struct image_dup_context *ctx, struct image_dup *dup1, struct image_dup *dup2)
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{
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byte *block1 = image_dup_block(dup1, 0, 0);
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byte *block2 = image_dup_block(dup2, 0, 0);
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uint e =
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err(block1[0], block2[0]) +
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err(block1[1], block2[1]) +
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err(block1[2], block2[2]);
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return e <= ctx->error_threshold;
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}
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static int
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blocks_compare(struct image_dup_context *ctx, struct image_dup *dup1, struct image_dup *dup2, uint tab_col, uint tab_row, uint trans)
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{
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DBG("blocks_compare(tab_col=%d tab_row=%d trans=%d)", tab_col, tab_row, trans);
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ctx->sum_pixels += 1 << (tab_col + tab_row);
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byte *block1 = image_dup_block(dup1, tab_col, tab_row);
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byte *block2;
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int col_step, row_step;
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if (trans < 4)
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block2 = image_dup_block(dup2, tab_col, tab_row);
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else
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block2 = image_dup_block(dup2, tab_row, tab_col);
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switch (trans)
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{
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case 0: ;
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uint err = (err_sum(block1, block2, 1 << (tab_col + tab_row)) >> (tab_col + tab_row));
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DBG("average error=%d", err);
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ctx->error = err;
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return err <= ctx->error_threshold;
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case 1:
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col_step = -3;
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row_step = (3 << tab_col);
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block2 += row_step - 3;
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break;
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case 2:
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col_step = 3;
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row_step = -(3 << tab_col);
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block2 += (3 << (tab_col + tab_row)) + row_step;
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break;
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case 3:
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col_step = -3;
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row_step = -(3 << tab_col);
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block2 += (3 << (tab_col + tab_row)) - 3;
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break;
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case 4:
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col_step = (3 << tab_row);
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row_step = 3;
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break;
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case 5:
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col_step = -(3 << tab_row);
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row_step = 3;
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block2 += (3 << (tab_col + tab_row)) + col_step;
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break;
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case 6:
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col_step = (3 << tab_row);
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row_step = -3;
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block2 += col_step - 3;
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break;
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case 7:
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col_step = -(3 << tab_row);
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row_step = -3;
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block2 += (3 << (tab_col + tab_row)) - 3;
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break;
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default:
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ASSERT(0);
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}
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uint err = (err_sum_transformed(block1, block2, (1 << tab_col), (1 << tab_row), (3 << tab_col), col_step, row_step) >> (tab_col + tab_row));
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DBG("average error=%d", err);
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ctx->error = err;
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return err <= ctx->error_threshold;
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}
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static int
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same_size_compare(struct image_dup_context *ctx, struct image_dup *dup1, struct image_dup *dup2, uint trans)
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{
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struct image *img1 = &dup1->image;
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struct image *img2 = &dup2->image;
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if (!img1->pixels || !img2->pixels)
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return 1;
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ctx->sum_pixels += img1->cols * img1->rows;
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byte *block1 = img1->pixels;
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byte *block2 = img2->pixels;
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int col_step, row_step;
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DBG("same_size_compare(trans=%d)", trans);
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switch (trans)
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{
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case 0: ;
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col_step = 3;
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row_step = img2->row_size;
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break;
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case 1:
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col_step = -3;
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row_step = img2->row_size;
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block2 += 3 * (img2->cols - 1);
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break;
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case 2:
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col_step = 3;
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row_step = -img2->row_size;
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block2 += img2->row_size * (img2->rows - 1);
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break;
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case 3:
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col_step = -3;
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row_step = -img2->row_size;
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block2 += img2->row_size * (img2->rows - 1) + 3 * (img2->cols - 1);
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break;
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case 4:
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col_step = img2->row_size;
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row_step = 3;
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break;
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case 5:
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col_step = -img2->row_size;
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row_step = 3;
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block2 += img2->row_size * (img2->rows - 1);
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break;
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case 6:
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col_step = img2->row_size;
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row_step = -3;
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block2 += 3 * (img2->cols - 1);
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break;
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case 7:
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col_step = -img2->row_size;
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row_step = -3;
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block2 += img2->row_size * (img2->rows - 1) + 3 * (img2->cols - 1);
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break;
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default:
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ASSERT(0);
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}
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uint err = (err_sum_transformed(block1, block2, img1->cols, img1->rows, img1->row_size, col_step, row_step) / ((u64)img1->cols * img1->rows));
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DBG("average error=%d", err);
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ctx->error = err;
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return err <= ctx->error_threshold;
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}
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uint
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image_dup_compare(struct image_dup_context *ctx, struct image_dup *dup1, struct image_dup *dup2)
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{
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DBG("image_dup_compare(%p, %p)", dup1, dup2);
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if (!average_compare(ctx, dup1, dup2))
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return 0;
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struct image *img1 = &dup1->image;
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struct image *img2 = &dup2->image;
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uint flags = ctx->flags;
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if (flags & IMAGE_DUP_SCALE)
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{
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DBG("Scale support");
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if (!aspect_ratio_test(ctx, img1->cols, img1->rows, img2->cols, img2->rows))
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flags &= ~0x0f;
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if (!aspect_ratio_test(ctx, img1->cols, img1->rows, img2->rows, img2->cols))
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flags &= ~0xf0;
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}
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else
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{
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DBG("No scale support");
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if (!(img1->cols == img2->cols && img1->rows == img2->rows))
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flags &= ~0x0f;
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if (!(img1->cols == img2->rows && img1->rows == img2->cols))
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flags &= ~0xf0;
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}
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if (!(flags & 0xff))
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return 0;
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uint result = 0;
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if (flags & 0x0f)
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{
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uint cols = MIN(dup1->tab_cols, dup2->tab_cols);
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uint rows = MIN(dup1->tab_rows, dup2->tab_rows);
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for (uint t = 0; t < 4; t++)
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if (flags & (1 << t))
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{
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DBG("Testing trans %d", t);
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uint i = MAX(cols, rows), depth = 1;
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while (i--)
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{
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depth++;
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uint col = MAX(0, (int)(cols - i));
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uint row = MAX(0, (int)(rows - i));
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if (!blocks_compare(ctx, dup1, dup2, col, row, t))
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break;
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if (!i &&
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(img1->cols != img2->cols || img1->rows != img2->rows ||
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same_size_compare(ctx, dup1, dup2, t)))
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{
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result |= 1 << t;
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if (!(flags & IMAGE_DUP_WANT_ALL))
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return result;
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else
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break;
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}
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}
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ctx->sum_depth += depth;
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}
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}
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if (flags & 0xf0)
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{
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uint cols = MIN(dup1->tab_cols, dup2->tab_rows);
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uint rows = MIN(dup1->tab_rows, dup2->tab_cols);
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for (uint t = 4; t < 8; t++)
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if (flags & (1 << t))
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{
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DBG("Testing trans %d", t);
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uint i = MAX(cols, rows), depth = 1;
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while (i--)
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{
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depth++;
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uint col = MAX(0, (int)(cols - i));
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uint row = MAX(0, (int)(rows - i));
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if (!blocks_compare(ctx, dup1, dup2, col, row, t))
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break;
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if (!i &&
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(img1->cols != img2->rows || img1->rows != img2->cols ||
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same_size_compare(ctx, dup1, dup2, t)) )
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{
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result |= 1 << t;
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if (!(flags & IMAGE_DUP_WANT_ALL))
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return result;
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else
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break;
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}
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}
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ctx->sum_depth += depth;
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}
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}
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return result;
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}
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