+++ /dev/null
-/*
- * transupp.c
- *
- * Copyright (C) 1997-2001, Thomas G. Lane.
- * This file is part of the Independent JPEG Group's software.
- * For conditions of distribution and use, see the accompanying README file.
- *
- * This file contains image transformation routines and other utility code
- * used by the jpegtran sample application. These are NOT part of the core
- * JPEG library. But we keep these routines separate from jpegtran.c to
- * ease the task of maintaining jpegtran-like programs that have other user
- * interfaces.
- */
-
-/* Although this file really shouldn't have access to the library internals,
- * it's helpful to let it call jround_up() and jcopy_block_row().
- */
-#define JPEG_INTERNALS
-
-#include "jinclude.h"
-#include "jpeglib.h"
-#include "transupp.h" /* My own external interface */
-#include <ctype.h> /* to declare isdigit() */
-
-
-#if TRANSFORMS_SUPPORTED
-
-/*
- * Lossless image transformation routines. These routines work on DCT
- * coefficient arrays and thus do not require any lossy decompression
- * or recompression of the image.
- * Thanks to Guido Vollbeding for the initial design and code of this feature,
- * and to Ben Jackson for introducing the cropping feature.
- *
- * Horizontal flipping is done in-place, using a single top-to-bottom
- * pass through the virtual source array. It will thus be much the
- * fastest option for images larger than main memory.
- *
- * The other routines require a set of destination virtual arrays, so they
- * need twice as much memory as jpegtran normally does. The destination
- * arrays are always written in normal scan order (top to bottom) because
- * the virtual array manager expects this. The source arrays will be scanned
- * in the corresponding order, which means multiple passes through the source
- * arrays for most of the transforms. That could result in much thrashing
- * if the image is larger than main memory.
- *
- * If cropping or trimming is involved, the destination arrays may be smaller
- * than the source arrays. Note it is not possible to do horizontal flip
- * in-place when a nonzero Y crop offset is specified, since we'd have to move
- * data from one block row to another but the virtual array manager doesn't
- * guarantee we can touch more than one row at a time. So in that case,
- * we have to use a separate destination array.
- *
- * Some notes about the operating environment of the individual transform
- * routines:
- * 1. Both the source and destination virtual arrays are allocated from the
- * source JPEG object, and therefore should be manipulated by calling the
- * source's memory manager.
- * 2. The destination's component count should be used. It may be smaller
- * than the source's when forcing to grayscale.
- * 3. Likewise the destination's sampling factors should be used. When
- * forcing to grayscale the destination's sampling factors will be all 1,
- * and we may as well take that as the effective iMCU size.
- * 4. When "trim" is in effect, the destination's dimensions will be the
- * trimmed values but the source's will be untrimmed.
- * 5. When "crop" is in effect, the destination's dimensions will be the
- * cropped values but the source's will be uncropped. Each transform
- * routine is responsible for picking up source data starting at the
- * correct X and Y offset for the crop region. (The X and Y offsets
- * passed to the transform routines are measured in iMCU blocks of the
- * destination.)
- * 6. All the routines assume that the source and destination buffers are
- * padded out to a full iMCU boundary. This is true, although for the
- * source buffer it is an undocumented property of jdcoefct.c.
- */
-
-
-LOCAL(void)
-do_crop (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
- JDIMENSION x_crop_offset, JDIMENSION y_crop_offset,
- jvirt_barray_ptr *src_coef_arrays,
- jvirt_barray_ptr *dst_coef_arrays)
-/* Crop. This is only used when no rotate/flip is requested with the crop. */
-{
- JDIMENSION dst_blk_y, x_crop_blocks, y_crop_blocks;
- int ci, offset_y;
- JBLOCKARRAY src_buffer, dst_buffer;
- jpeg_component_info *compptr;
-
- /* We simply have to copy the right amount of data (the destination's
- * image size) starting at the given X and Y offsets in the source.
- */
- for (ci = 0; ci < dstinfo->num_components; ci++) {
- compptr = dstinfo->comp_info + ci;
- x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
- y_crop_blocks = y_crop_offset * compptr->v_samp_factor;
- for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
- dst_blk_y += compptr->v_samp_factor) {
- dst_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
- (JDIMENSION) compptr->v_samp_factor, TRUE);
- src_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, src_coef_arrays[ci],
- dst_blk_y + y_crop_blocks,
- (JDIMENSION) compptr->v_samp_factor, FALSE);
- for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
- jcopy_block_row(src_buffer[offset_y] + x_crop_blocks,
- dst_buffer[offset_y],
- compptr->width_in_blocks);
- }
- }
- }
-}
-
-
-LOCAL(void)
-do_flip_h_no_crop (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
- JDIMENSION x_crop_offset,
- jvirt_barray_ptr *src_coef_arrays)
-/* Horizontal flip; done in-place, so no separate dest array is required.
- * NB: this only works when y_crop_offset is zero.
- */
-{
- JDIMENSION MCU_cols, comp_width, blk_x, blk_y, x_crop_blocks;
- int ci, k, offset_y;
- JBLOCKARRAY buffer;
- JCOEFPTR ptr1, ptr2;
- JCOEF temp1, temp2;
- jpeg_component_info *compptr;
-
- /* Horizontal mirroring of DCT blocks is accomplished by swapping
- * pairs of blocks in-place. Within a DCT block, we perform horizontal
- * mirroring by changing the signs of odd-numbered columns.
- * Partial iMCUs at the right edge are left untouched.
- */
- MCU_cols = srcinfo->image_width / (dstinfo->max_h_samp_factor * DCTSIZE);
-
- for (ci = 0; ci < dstinfo->num_components; ci++) {
- compptr = dstinfo->comp_info + ci;
- comp_width = MCU_cols * compptr->h_samp_factor;
- x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
- for (blk_y = 0; blk_y < compptr->height_in_blocks;
- blk_y += compptr->v_samp_factor) {
- buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, src_coef_arrays[ci], blk_y,
- (JDIMENSION) compptr->v_samp_factor, TRUE);
- for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
- /* Do the mirroring */
- for (blk_x = 0; blk_x * 2 < comp_width; blk_x++) {
- ptr1 = buffer[offset_y][blk_x];
- ptr2 = buffer[offset_y][comp_width - blk_x - 1];
- /* this unrolled loop doesn't need to know which row it's on... */
- for (k = 0; k < DCTSIZE2; k += 2) {
- temp1 = *ptr1; /* swap even column */
- temp2 = *ptr2;
- *ptr1++ = temp2;
- *ptr2++ = temp1;
- temp1 = *ptr1; /* swap odd column with sign change */
- temp2 = *ptr2;
- *ptr1++ = -temp2;
- *ptr2++ = -temp1;
- }
- }
- if (x_crop_blocks > 0) {
- /* Now left-justify the portion of the data to be kept.
- * We can't use a single jcopy_block_row() call because that routine
- * depends on memcpy(), whose behavior is unspecified for overlapping
- * source and destination areas. Sigh.
- */
- for (blk_x = 0; blk_x < compptr->width_in_blocks; blk_x++) {
- jcopy_block_row(buffer[offset_y] + blk_x + x_crop_blocks,
- buffer[offset_y] + blk_x,
- (JDIMENSION) 1);
- }
- }
- }
- }
- }
-}
-
-
-LOCAL(void)
-do_flip_h (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
- JDIMENSION x_crop_offset, JDIMENSION y_crop_offset,
- jvirt_barray_ptr *src_coef_arrays,
- jvirt_barray_ptr *dst_coef_arrays)
-/* Horizontal flip in general cropping case */
-{
- JDIMENSION MCU_cols, comp_width, dst_blk_x, dst_blk_y;
- JDIMENSION x_crop_blocks, y_crop_blocks;
- int ci, k, offset_y;
- JBLOCKARRAY src_buffer, dst_buffer;
- JBLOCKROW src_row_ptr, dst_row_ptr;
- JCOEFPTR src_ptr, dst_ptr;
- jpeg_component_info *compptr;
-
- /* Here we must output into a separate array because we can't touch
- * different rows of a single virtual array simultaneously. Otherwise,
- * this is essentially the same as the routine above.
- */
- MCU_cols = srcinfo->image_width / (dstinfo->max_h_samp_factor * DCTSIZE);
-
- for (ci = 0; ci < dstinfo->num_components; ci++) {
- compptr = dstinfo->comp_info + ci;
- comp_width = MCU_cols * compptr->h_samp_factor;
- x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
- y_crop_blocks = y_crop_offset * compptr->v_samp_factor;
- for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
- dst_blk_y += compptr->v_samp_factor) {
- dst_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
- (JDIMENSION) compptr->v_samp_factor, TRUE);
- src_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, src_coef_arrays[ci],
- dst_blk_y + y_crop_blocks,
- (JDIMENSION) compptr->v_samp_factor, FALSE);
- for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
- dst_row_ptr = dst_buffer[offset_y];
- src_row_ptr = src_buffer[offset_y];
- for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; dst_blk_x++) {
- if (x_crop_blocks + dst_blk_x < comp_width) {
- /* Do the mirrorable blocks */
- dst_ptr = dst_row_ptr[dst_blk_x];
- src_ptr = src_row_ptr[comp_width - x_crop_blocks - dst_blk_x - 1];
- /* this unrolled loop doesn't need to know which row it's on... */
- for (k = 0; k < DCTSIZE2; k += 2) {
- *dst_ptr++ = *src_ptr++; /* copy even column */
- *dst_ptr++ = - *src_ptr++; /* copy odd column with sign change */
- }
- } else {
- /* Copy last partial block(s) verbatim */
- jcopy_block_row(src_row_ptr + dst_blk_x + x_crop_blocks,
- dst_row_ptr + dst_blk_x,
- (JDIMENSION) 1);
- }
- }
- }
- }
- }
-}
-
-
-LOCAL(void)
-do_flip_v (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
- JDIMENSION x_crop_offset, JDIMENSION y_crop_offset,
- jvirt_barray_ptr *src_coef_arrays,
- jvirt_barray_ptr *dst_coef_arrays)
-/* Vertical flip */
-{
- JDIMENSION MCU_rows, comp_height, dst_blk_x, dst_blk_y;
- JDIMENSION x_crop_blocks, y_crop_blocks;
- int ci, i, j, offset_y;
- JBLOCKARRAY src_buffer, dst_buffer;
- JBLOCKROW src_row_ptr, dst_row_ptr;
- JCOEFPTR src_ptr, dst_ptr;
- jpeg_component_info *compptr;
-
- /* We output into a separate array because we can't touch different
- * rows of the source virtual array simultaneously. Otherwise, this
- * is a pretty straightforward analog of horizontal flip.
- * Within a DCT block, vertical mirroring is done by changing the signs
- * of odd-numbered rows.
- * Partial iMCUs at the bottom edge are copied verbatim.
- */
- MCU_rows = srcinfo->image_height / (dstinfo->max_v_samp_factor * DCTSIZE);
-
- for (ci = 0; ci < dstinfo->num_components; ci++) {
- compptr = dstinfo->comp_info + ci;
- comp_height = MCU_rows * compptr->v_samp_factor;
- x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
- y_crop_blocks = y_crop_offset * compptr->v_samp_factor;
- for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
- dst_blk_y += compptr->v_samp_factor) {
- dst_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
- (JDIMENSION) compptr->v_samp_factor, TRUE);
- if (y_crop_blocks + dst_blk_y < comp_height) {
- /* Row is within the mirrorable area. */
- src_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, src_coef_arrays[ci],
- comp_height - y_crop_blocks - dst_blk_y -
- (JDIMENSION) compptr->v_samp_factor,
- (JDIMENSION) compptr->v_samp_factor, FALSE);
- } else {
- /* Bottom-edge blocks will be copied verbatim. */
- src_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, src_coef_arrays[ci],
- dst_blk_y + y_crop_blocks,
- (JDIMENSION) compptr->v_samp_factor, FALSE);
- }
- for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
- if (y_crop_blocks + dst_blk_y < comp_height) {
- /* Row is within the mirrorable area. */
- dst_row_ptr = dst_buffer[offset_y];
- src_row_ptr = src_buffer[compptr->v_samp_factor - offset_y - 1];
- src_row_ptr += x_crop_blocks;
- for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks;
- dst_blk_x++) {
- dst_ptr = dst_row_ptr[dst_blk_x];
- src_ptr = src_row_ptr[dst_blk_x];
- for (i = 0; i < DCTSIZE; i += 2) {
- /* copy even row */
- for (j = 0; j < DCTSIZE; j++)
- *dst_ptr++ = *src_ptr++;
- /* copy odd row with sign change */
- for (j = 0; j < DCTSIZE; j++)
- *dst_ptr++ = - *src_ptr++;
- }
- }
- } else {
- /* Just copy row verbatim. */
- jcopy_block_row(src_buffer[offset_y] + x_crop_blocks,
- dst_buffer[offset_y],
- compptr->width_in_blocks);
- }
- }
- }
- }
-}
-
-
-LOCAL(void)
-do_transpose (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
- JDIMENSION x_crop_offset, JDIMENSION y_crop_offset,
- jvirt_barray_ptr *src_coef_arrays,
- jvirt_barray_ptr *dst_coef_arrays)
-/* Transpose source into destination */
-{
- JDIMENSION dst_blk_x, dst_blk_y, x_crop_blocks, y_crop_blocks;
- int ci, i, j, offset_x, offset_y;
- JBLOCKARRAY src_buffer, dst_buffer;
- JCOEFPTR src_ptr, dst_ptr;
- jpeg_component_info *compptr;
-
- /* Transposing pixels within a block just requires transposing the
- * DCT coefficients.
- * Partial iMCUs at the edges require no special treatment; we simply
- * process all the available DCT blocks for every component.
- */
- for (ci = 0; ci < dstinfo->num_components; ci++) {
- compptr = dstinfo->comp_info + ci;
- x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
- y_crop_blocks = y_crop_offset * compptr->v_samp_factor;
- for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
- dst_blk_y += compptr->v_samp_factor) {
- dst_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
- (JDIMENSION) compptr->v_samp_factor, TRUE);
- for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
- for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks;
- dst_blk_x += compptr->h_samp_factor) {
- src_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, src_coef_arrays[ci],
- dst_blk_x + x_crop_blocks,
- (JDIMENSION) compptr->h_samp_factor, FALSE);
- for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) {
- dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x];
- src_ptr = src_buffer[offset_x][dst_blk_y + offset_y + y_crop_blocks];
- for (i = 0; i < DCTSIZE; i++)
- for (j = 0; j < DCTSIZE; j++)
- dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
- }
- }
- }
- }
- }
-}
-
-
-LOCAL(void)
-do_rot_90 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
- JDIMENSION x_crop_offset, JDIMENSION y_crop_offset,
- jvirt_barray_ptr *src_coef_arrays,
- jvirt_barray_ptr *dst_coef_arrays)
-/* 90 degree rotation is equivalent to
- * 1. Transposing the image;
- * 2. Horizontal mirroring.
- * These two steps are merged into a single processing routine.
- */
-{
- JDIMENSION MCU_cols, comp_width, dst_blk_x, dst_blk_y;
- JDIMENSION x_crop_blocks, y_crop_blocks;
- int ci, i, j, offset_x, offset_y;
- JBLOCKARRAY src_buffer, dst_buffer;
- JCOEFPTR src_ptr, dst_ptr;
- jpeg_component_info *compptr;
-
- /* Because of the horizontal mirror step, we can't process partial iMCUs
- * at the (output) right edge properly. They just get transposed and
- * not mirrored.
- */
- MCU_cols = srcinfo->image_height / (dstinfo->max_h_samp_factor * DCTSIZE);
-
- for (ci = 0; ci < dstinfo->num_components; ci++) {
- compptr = dstinfo->comp_info + ci;
- comp_width = MCU_cols * compptr->h_samp_factor;
- x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
- y_crop_blocks = y_crop_offset * compptr->v_samp_factor;
- for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
- dst_blk_y += compptr->v_samp_factor) {
- dst_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
- (JDIMENSION) compptr->v_samp_factor, TRUE);
- for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
- for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks;
- dst_blk_x += compptr->h_samp_factor) {
- if (x_crop_blocks + dst_blk_x < comp_width) {
- /* Block is within the mirrorable area. */
- src_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, src_coef_arrays[ci],
- comp_width - x_crop_blocks - dst_blk_x -
- (JDIMENSION) compptr->h_samp_factor,
- (JDIMENSION) compptr->h_samp_factor, FALSE);
- } else {
- /* Edge blocks are transposed but not mirrored. */
- src_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, src_coef_arrays[ci],
- dst_blk_x + x_crop_blocks,
- (JDIMENSION) compptr->h_samp_factor, FALSE);
- }
- for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) {
- dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x];
- if (x_crop_blocks + dst_blk_x < comp_width) {
- /* Block is within the mirrorable area. */
- src_ptr = src_buffer[compptr->h_samp_factor - offset_x - 1]
- [dst_blk_y + offset_y + y_crop_blocks];
- for (i = 0; i < DCTSIZE; i++) {
- for (j = 0; j < DCTSIZE; j++)
- dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
- i++;
- for (j = 0; j < DCTSIZE; j++)
- dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
- }
- } else {
- /* Edge blocks are transposed but not mirrored. */
- src_ptr = src_buffer[offset_x]
- [dst_blk_y + offset_y + y_crop_blocks];
- for (i = 0; i < DCTSIZE; i++)
- for (j = 0; j < DCTSIZE; j++)
- dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
- }
- }
- }
- }
- }
- }
-}
-
-
-LOCAL(void)
-do_rot_270 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
- JDIMENSION x_crop_offset, JDIMENSION y_crop_offset,
- jvirt_barray_ptr *src_coef_arrays,
- jvirt_barray_ptr *dst_coef_arrays)
-/* 270 degree rotation is equivalent to
- * 1. Horizontal mirroring;
- * 2. Transposing the image.
- * These two steps are merged into a single processing routine.
- */
-{
- JDIMENSION MCU_rows, comp_height, dst_blk_x, dst_blk_y;
- JDIMENSION x_crop_blocks, y_crop_blocks;
- int ci, i, j, offset_x, offset_y;
- JBLOCKARRAY src_buffer, dst_buffer;
- JCOEFPTR src_ptr, dst_ptr;
- jpeg_component_info *compptr;
-
- /* Because of the horizontal mirror step, we can't process partial iMCUs
- * at the (output) bottom edge properly. They just get transposed and
- * not mirrored.
- */
- MCU_rows = srcinfo->image_width / (dstinfo->max_v_samp_factor * DCTSIZE);
-
- for (ci = 0; ci < dstinfo->num_components; ci++) {
- compptr = dstinfo->comp_info + ci;
- comp_height = MCU_rows * compptr->v_samp_factor;
- x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
- y_crop_blocks = y_crop_offset * compptr->v_samp_factor;
- for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
- dst_blk_y += compptr->v_samp_factor) {
- dst_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
- (JDIMENSION) compptr->v_samp_factor, TRUE);
- for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
- for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks;
- dst_blk_x += compptr->h_samp_factor) {
- src_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, src_coef_arrays[ci],
- dst_blk_x + x_crop_blocks,
- (JDIMENSION) compptr->h_samp_factor, FALSE);
- for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) {
- dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x];
- if (y_crop_blocks + dst_blk_y < comp_height) {
- /* Block is within the mirrorable area. */
- src_ptr = src_buffer[offset_x]
- [comp_height - y_crop_blocks - dst_blk_y - offset_y - 1];
- for (i = 0; i < DCTSIZE; i++) {
- for (j = 0; j < DCTSIZE; j++) {
- dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
- j++;
- dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
- }
- }
- } else {
- /* Edge blocks are transposed but not mirrored. */
- src_ptr = src_buffer[offset_x]
- [dst_blk_y + offset_y + y_crop_blocks];
- for (i = 0; i < DCTSIZE; i++)
- for (j = 0; j < DCTSIZE; j++)
- dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
- }
- }
- }
- }
- }
- }
-}
-
-
-LOCAL(void)
-do_rot_180 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
- JDIMENSION x_crop_offset, JDIMENSION y_crop_offset,
- jvirt_barray_ptr *src_coef_arrays,
- jvirt_barray_ptr *dst_coef_arrays)
-/* 180 degree rotation is equivalent to
- * 1. Vertical mirroring;
- * 2. Horizontal mirroring.
- * These two steps are merged into a single processing routine.
- */
-{
- JDIMENSION MCU_cols, MCU_rows, comp_width, comp_height, dst_blk_x, dst_blk_y;
- JDIMENSION x_crop_blocks, y_crop_blocks;
- int ci, i, j, offset_y;
- JBLOCKARRAY src_buffer, dst_buffer;
- JBLOCKROW src_row_ptr, dst_row_ptr;
- JCOEFPTR src_ptr, dst_ptr;
- jpeg_component_info *compptr;
-
- MCU_cols = srcinfo->image_width / (dstinfo->max_h_samp_factor * DCTSIZE);
- MCU_rows = srcinfo->image_height / (dstinfo->max_v_samp_factor * DCTSIZE);
-
- for (ci = 0; ci < dstinfo->num_components; ci++) {
- compptr = dstinfo->comp_info + ci;
- comp_width = MCU_cols * compptr->h_samp_factor;
- comp_height = MCU_rows * compptr->v_samp_factor;
- x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
- y_crop_blocks = y_crop_offset * compptr->v_samp_factor;
- for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
- dst_blk_y += compptr->v_samp_factor) {
- dst_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
- (JDIMENSION) compptr->v_samp_factor, TRUE);
- if (y_crop_blocks + dst_blk_y < comp_height) {
- /* Row is within the vertically mirrorable area. */
- src_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, src_coef_arrays[ci],
- comp_height - y_crop_blocks - dst_blk_y -
- (JDIMENSION) compptr->v_samp_factor,
- (JDIMENSION) compptr->v_samp_factor, FALSE);
- } else {
- /* Bottom-edge rows are only mirrored horizontally. */
- src_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, src_coef_arrays[ci],
- dst_blk_y + y_crop_blocks,
- (JDIMENSION) compptr->v_samp_factor, FALSE);
- }
- for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
- dst_row_ptr = dst_buffer[offset_y];
- if (y_crop_blocks + dst_blk_y < comp_height) {
- /* Row is within the mirrorable area. */
- src_row_ptr = src_buffer[compptr->v_samp_factor - offset_y - 1];
- for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; dst_blk_x++) {
- dst_ptr = dst_row_ptr[dst_blk_x];
- if (x_crop_blocks + dst_blk_x < comp_width) {
- /* Process the blocks that can be mirrored both ways. */
- src_ptr = src_row_ptr[comp_width - x_crop_blocks - dst_blk_x - 1];
- for (i = 0; i < DCTSIZE; i += 2) {
- /* For even row, negate every odd column. */
- for (j = 0; j < DCTSIZE; j += 2) {
- *dst_ptr++ = *src_ptr++;
- *dst_ptr++ = - *src_ptr++;
- }
- /* For odd row, negate every even column. */
- for (j = 0; j < DCTSIZE; j += 2) {
- *dst_ptr++ = - *src_ptr++;
- *dst_ptr++ = *src_ptr++;
- }
- }
- } else {
- /* Any remaining right-edge blocks are only mirrored vertically. */
- src_ptr = src_row_ptr[x_crop_blocks + dst_blk_x];
- for (i = 0; i < DCTSIZE; i += 2) {
- for (j = 0; j < DCTSIZE; j++)
- *dst_ptr++ = *src_ptr++;
- for (j = 0; j < DCTSIZE; j++)
- *dst_ptr++ = - *src_ptr++;
- }
- }
- }
- } else {
- /* Remaining rows are just mirrored horizontally. */
- src_row_ptr = src_buffer[offset_y];
- for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; dst_blk_x++) {
- if (x_crop_blocks + dst_blk_x < comp_width) {
- /* Process the blocks that can be mirrored. */
- dst_ptr = dst_row_ptr[dst_blk_x];
- src_ptr = src_row_ptr[comp_width - x_crop_blocks - dst_blk_x - 1];
- for (i = 0; i < DCTSIZE2; i += 2) {
- *dst_ptr++ = *src_ptr++;
- *dst_ptr++ = - *src_ptr++;
- }
- } else {
- /* Any remaining right-edge blocks are only copied. */
- jcopy_block_row(src_row_ptr + dst_blk_x + x_crop_blocks,
- dst_row_ptr + dst_blk_x,
- (JDIMENSION) 1);
- }
- }
- }
- }
- }
- }
-}
-
-
-LOCAL(void)
-do_transverse (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
- JDIMENSION x_crop_offset, JDIMENSION y_crop_offset,
- jvirt_barray_ptr *src_coef_arrays,
- jvirt_barray_ptr *dst_coef_arrays)
-/* Transverse transpose is equivalent to
- * 1. 180 degree rotation;
- * 2. Transposition;
- * or
- * 1. Horizontal mirroring;
- * 2. Transposition;
- * 3. Horizontal mirroring.
- * These steps are merged into a single processing routine.
- */
-{
- JDIMENSION MCU_cols, MCU_rows, comp_width, comp_height, dst_blk_x, dst_blk_y;
- JDIMENSION x_crop_blocks, y_crop_blocks;
- int ci, i, j, offset_x, offset_y;
- JBLOCKARRAY src_buffer, dst_buffer;
- JCOEFPTR src_ptr, dst_ptr;
- jpeg_component_info *compptr;
-
- MCU_cols = srcinfo->image_height / (dstinfo->max_h_samp_factor * DCTSIZE);
- MCU_rows = srcinfo->image_width / (dstinfo->max_v_samp_factor * DCTSIZE);
-
- for (ci = 0; ci < dstinfo->num_components; ci++) {
- compptr = dstinfo->comp_info + ci;
- comp_width = MCU_cols * compptr->h_samp_factor;
- comp_height = MCU_rows * compptr->v_samp_factor;
- x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
- y_crop_blocks = y_crop_offset * compptr->v_samp_factor;
- for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
- dst_blk_y += compptr->v_samp_factor) {
- dst_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
- (JDIMENSION) compptr->v_samp_factor, TRUE);
- for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
- for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks;
- dst_blk_x += compptr->h_samp_factor) {
- if (x_crop_blocks + dst_blk_x < comp_width) {
- /* Block is within the mirrorable area. */
- src_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, src_coef_arrays[ci],
- comp_width - x_crop_blocks - dst_blk_x -
- (JDIMENSION) compptr->h_samp_factor,
- (JDIMENSION) compptr->h_samp_factor, FALSE);
- } else {
- src_buffer = (*srcinfo->mem->access_virt_barray)
- ((j_common_ptr) srcinfo, src_coef_arrays[ci],
- dst_blk_x + x_crop_blocks,
- (JDIMENSION) compptr->h_samp_factor, FALSE);
- }
- for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) {
- dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x];
- if (y_crop_blocks + dst_blk_y < comp_height) {
- if (x_crop_blocks + dst_blk_x < comp_width) {
- /* Block is within the mirrorable area. */
- src_ptr = src_buffer[compptr->h_samp_factor - offset_x - 1]
- [comp_height - y_crop_blocks - dst_blk_y - offset_y - 1];
- for (i = 0; i < DCTSIZE; i++) {
- for (j = 0; j < DCTSIZE; j++) {
- dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
- j++;
- dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
- }
- i++;
- for (j = 0; j < DCTSIZE; j++) {
- dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
- j++;
- dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
- }
- }
- } else {
- /* Right-edge blocks are mirrored in y only */
- src_ptr = src_buffer[offset_x]
- [comp_height - y_crop_blocks - dst_blk_y - offset_y - 1];
- for (i = 0; i < DCTSIZE; i++) {
- for (j = 0; j < DCTSIZE; j++) {
- dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
- j++;
- dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
- }
- }
- }
- } else {
- if (x_crop_blocks + dst_blk_x < comp_width) {
- /* Bottom-edge blocks are mirrored in x only */
- src_ptr = src_buffer[compptr->h_samp_factor - offset_x - 1]
- [dst_blk_y + offset_y + y_crop_blocks];
- for (i = 0; i < DCTSIZE; i++) {
- for (j = 0; j < DCTSIZE; j++)
- dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
- i++;
- for (j = 0; j < DCTSIZE; j++)
- dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
- }
- } else {
- /* At lower right corner, just transpose, no mirroring */
- src_ptr = src_buffer[offset_x]
- [dst_blk_y + offset_y + y_crop_blocks];
- for (i = 0; i < DCTSIZE; i++)
- for (j = 0; j < DCTSIZE; j++)
- dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
- }
- }
- }
- }
- }
- }
- }
-}
-
-
-/* Parse an unsigned integer: subroutine for jtransform_parse_crop_spec.
- * Returns TRUE if valid integer found, FALSE if not.
- * *strptr is advanced over the digit string, and *result is set to its value.
- */
-
-LOCAL(boolean)
-jt_read_integer (const char ** strptr, JDIMENSION * result)
-{
- const char * ptr = *strptr;
- JDIMENSION val = 0;
-
- for (; isdigit(*ptr); ptr++) {
- val = val * 10 + (JDIMENSION) (*ptr - '0');
- }
- *result = val;
- if (ptr == *strptr)
- return FALSE; /* oops, no digits */
- *strptr = ptr;
- return TRUE;
-}
-
-
-/* Parse a crop specification (written in X11 geometry style).
- * The routine returns TRUE if the spec string is valid, FALSE if not.
- *
- * The crop spec string should have the format
- * <width>x<height>{+-}<xoffset>{+-}<yoffset>
- * where width, height, xoffset, and yoffset are unsigned integers.
- * Each of the elements can be omitted to indicate a default value.
- * (A weakness of this style is that it is not possible to omit xoffset
- * while specifying yoffset, since they look alike.)
- *
- * This code is loosely based on XParseGeometry from the X11 distribution.
- */
-
-GLOBAL(boolean)
-jtransform_parse_crop_spec (jpeg_transform_info *info, const char *spec)
-{
- info->crop = FALSE;
- info->crop_width_set = JCROP_UNSET;
- info->crop_height_set = JCROP_UNSET;
- info->crop_xoffset_set = JCROP_UNSET;
- info->crop_yoffset_set = JCROP_UNSET;
-
- if (isdigit(*spec)) {
- /* fetch width */
- if (! jt_read_integer(&spec, &info->crop_width))
- return FALSE;
- info->crop_width_set = JCROP_POS;
- }
- if (*spec == 'x' || *spec == 'X') {
- /* fetch height */
- spec++;
- if (! jt_read_integer(&spec, &info->crop_height))
- return FALSE;
- info->crop_height_set = JCROP_POS;
- }
- if (*spec == '+' || *spec == '-') {
- /* fetch xoffset */
- info->crop_xoffset_set = (*spec == '-') ? JCROP_NEG : JCROP_POS;
- spec++;
- if (! jt_read_integer(&spec, &info->crop_xoffset))
- return FALSE;
- }
- if (*spec == '+' || *spec == '-') {
- /* fetch yoffset */
- info->crop_yoffset_set = (*spec == '-') ? JCROP_NEG : JCROP_POS;
- spec++;
- if (! jt_read_integer(&spec, &info->crop_yoffset))
- return FALSE;
- }
- /* We had better have gotten to the end of the string. */
- if (*spec != '\0')
- return FALSE;
- info->crop = TRUE;
- return TRUE;
-}
-
-
-/* Trim off any partial iMCUs on the indicated destination edge */
-
-LOCAL(void)
-trim_right_edge (jpeg_transform_info *info, JDIMENSION full_width)
-{
- JDIMENSION MCU_cols;
-
- MCU_cols = info->output_width / (info->max_h_samp_factor * DCTSIZE);
- if (MCU_cols > 0 && info->x_crop_offset + MCU_cols ==
- full_width / (info->max_h_samp_factor * DCTSIZE))
- info->output_width = MCU_cols * (info->max_h_samp_factor * DCTSIZE);
-}
-
-LOCAL(void)
-trim_bottom_edge (jpeg_transform_info *info, JDIMENSION full_height)
-{
- JDIMENSION MCU_rows;
-
- MCU_rows = info->output_height / (info->max_v_samp_factor * DCTSIZE);
- if (MCU_rows > 0 && info->y_crop_offset + MCU_rows ==
- full_height / (info->max_v_samp_factor * DCTSIZE))
- info->output_height = MCU_rows * (info->max_v_samp_factor * DCTSIZE);
-}
-
-
-/* Request any required workspace.
- *
- * This routine figures out the size that the output image will be
- * (which implies that all the transform parameters must be set before
- * it is called).
- *
- * We allocate the workspace virtual arrays from the source decompression
- * object, so that all the arrays (both the original data and the workspace)
- * will be taken into account while making memory management decisions.
- * Hence, this routine must be called after jpeg_read_header (which reads
- * the image dimensions) and before jpeg_read_coefficients (which realizes
- * the source's virtual arrays).
- */
-
-GLOBAL(void)
-jtransform_request_workspace (j_decompress_ptr srcinfo,
- jpeg_transform_info *info)
-{
- jvirt_barray_ptr *coef_arrays = NULL;
- boolean need_workspace, transpose_it;
- jpeg_component_info *compptr;
- JDIMENSION xoffset, yoffset, width_in_iMCUs, height_in_iMCUs;
- JDIMENSION width_in_blocks, height_in_blocks;
- int ci, h_samp_factor, v_samp_factor;
-
- /* Determine number of components in output image */
- if (info->force_grayscale &&
- srcinfo->jpeg_color_space == JCS_YCbCr &&
- srcinfo->num_components == 3) {
- /* We'll only process the first component */
- info->num_components = 1;
- } else {
- /* Process all the components */
- info->num_components = srcinfo->num_components;
- }
- /* If there is only one output component, force the iMCU size to be 1;
- * else use the source iMCU size. (This allows us to do the right thing
- * when reducing color to grayscale, and also provides a handy way of
- * cleaning up "funny" grayscale images whose sampling factors are not 1x1.)
- */
-
- switch (info->transform) {
- case JXFORM_TRANSPOSE:
- case JXFORM_TRANSVERSE:
- case JXFORM_ROT_90:
- case JXFORM_ROT_270:
- info->output_width = srcinfo->image_height;
- info->output_height = srcinfo->image_width;
- if (info->num_components == 1) {
- info->max_h_samp_factor = 1;
- info->max_v_samp_factor = 1;
- } else {
- info->max_h_samp_factor = srcinfo->max_v_samp_factor;
- info->max_v_samp_factor = srcinfo->max_h_samp_factor;
- }
- break;
- default:
- info->output_width = srcinfo->image_width;
- info->output_height = srcinfo->image_height;
- if (info->num_components == 1) {
- info->max_h_samp_factor = 1;
- info->max_v_samp_factor = 1;
- } else {
- info->max_h_samp_factor = srcinfo->max_h_samp_factor;
- info->max_v_samp_factor = srcinfo->max_v_samp_factor;
- }
- break;
- }
-
- /* If cropping has been requested, compute the crop area's position and
- * dimensions, ensuring that its upper left corner falls at an iMCU boundary.
- */
- if (info->crop) {
- /* Insert default values for unset crop parameters */
- if (info->crop_xoffset_set == JCROP_UNSET)
- info->crop_xoffset = 0; /* default to +0 */
- if (info->crop_yoffset_set == JCROP_UNSET)
- info->crop_yoffset = 0; /* default to +0 */
- if (info->crop_xoffset >= info->output_width ||
- info->crop_yoffset >= info->output_height)
- ERREXIT(srcinfo, JERR_BAD_CROP_SPEC);
- if (info->crop_width_set == JCROP_UNSET)
- info->crop_width = info->output_width - info->crop_xoffset;
- if (info->crop_height_set == JCROP_UNSET)
- info->crop_height = info->output_height - info->crop_yoffset;
- /* Ensure parameters are valid */
- if (info->crop_width <= 0 || info->crop_width > info->output_width ||
- info->crop_height <= 0 || info->crop_height > info->output_height ||
- info->crop_xoffset > info->output_width - info->crop_width ||
- info->crop_yoffset > info->output_height - info->crop_height)
- ERREXIT(srcinfo, JERR_BAD_CROP_SPEC);
- /* Convert negative crop offsets into regular offsets */
- if (info->crop_xoffset_set == JCROP_NEG)
- xoffset = info->output_width - info->crop_width - info->crop_xoffset;
- else
- xoffset = info->crop_xoffset;
- if (info->crop_yoffset_set == JCROP_NEG)
- yoffset = info->output_height - info->crop_height - info->crop_yoffset;
- else
- yoffset = info->crop_yoffset;
- /* Now adjust so that upper left corner falls at an iMCU boundary */
- info->output_width =
- info->crop_width + (xoffset % (info->max_h_samp_factor * DCTSIZE));
- info->output_height =
- info->crop_height + (yoffset % (info->max_v_samp_factor * DCTSIZE));
- /* Save x/y offsets measured in iMCUs */
- info->x_crop_offset = xoffset / (info->max_h_samp_factor * DCTSIZE);
- info->y_crop_offset = yoffset / (info->max_v_samp_factor * DCTSIZE);
- } else {
- info->x_crop_offset = 0;
- info->y_crop_offset = 0;
- }
-
- /* Figure out whether we need workspace arrays,
- * and if so whether they are transposed relative to the source.
- */
- need_workspace = FALSE;
- transpose_it = FALSE;
- switch (info->transform) {
- case JXFORM_NONE:
- if (info->x_crop_offset != 0 || info->y_crop_offset != 0)
- need_workspace = TRUE;
- /* No workspace needed if neither cropping nor transforming */
- break;
- case JXFORM_FLIP_H:
- if (info->trim)
- trim_right_edge(info, srcinfo->image_width);
- if (info->y_crop_offset != 0)
- need_workspace = TRUE;
- /* do_flip_h_no_crop doesn't need a workspace array */
- break;
- case JXFORM_FLIP_V:
- if (info->trim)
- trim_bottom_edge(info, srcinfo->image_height);
- /* Need workspace arrays having same dimensions as source image. */
- need_workspace = TRUE;
- break;
- case JXFORM_TRANSPOSE:
- /* transpose does NOT have to trim anything */
- /* Need workspace arrays having transposed dimensions. */
- need_workspace = TRUE;
- transpose_it = TRUE;
- break;
- case JXFORM_TRANSVERSE:
- if (info->trim) {
- trim_right_edge(info, srcinfo->image_height);
- trim_bottom_edge(info, srcinfo->image_width);
- }
- /* Need workspace arrays having transposed dimensions. */
- need_workspace = TRUE;
- transpose_it = TRUE;
- break;
- case JXFORM_ROT_90:
- if (info->trim)
- trim_right_edge(info, srcinfo->image_height);
- /* Need workspace arrays having transposed dimensions. */
- need_workspace = TRUE;
- transpose_it = TRUE;
- break;
- case JXFORM_ROT_180:
- if (info->trim) {
- trim_right_edge(info, srcinfo->image_width);
- trim_bottom_edge(info, srcinfo->image_height);
- }
- /* Need workspace arrays having same dimensions as source image. */
- need_workspace = TRUE;
- break;
- case JXFORM_ROT_270:
- if (info->trim)
- trim_bottom_edge(info, srcinfo->image_width);
- /* Need workspace arrays having transposed dimensions. */
- need_workspace = TRUE;
- transpose_it = TRUE;
- break;
- }
-
- /* Allocate workspace if needed.
- * Note that we allocate arrays padded out to the next iMCU boundary,
- * so that transform routines need not worry about missing edge blocks.
- */
- if (need_workspace) {
- coef_arrays = (jvirt_barray_ptr *)
- (*srcinfo->mem->alloc_small) ((j_common_ptr) srcinfo, JPOOL_IMAGE,
- SIZEOF(jvirt_barray_ptr) * info->num_components);
- width_in_iMCUs = (JDIMENSION)
- jdiv_round_up((long) info->output_width,
- (long) (info->max_h_samp_factor * DCTSIZE));
- height_in_iMCUs = (JDIMENSION)
- jdiv_round_up((long) info->output_height,
- (long) (info->max_v_samp_factor * DCTSIZE));
- for (ci = 0; ci < info->num_components; ci++) {
- compptr = srcinfo->comp_info + ci;
- if (info->num_components == 1) {
- /* we're going to force samp factors to 1x1 in this case */
- h_samp_factor = v_samp_factor = 1;
- } else if (transpose_it) {
- h_samp_factor = compptr->v_samp_factor;
- v_samp_factor = compptr->h_samp_factor;
- } else {
- h_samp_factor = compptr->h_samp_factor;
- v_samp_factor = compptr->v_samp_factor;
- }
- width_in_blocks = width_in_iMCUs * h_samp_factor;
- height_in_blocks = height_in_iMCUs * v_samp_factor;
- coef_arrays[ci] = (*srcinfo->mem->request_virt_barray)
- ((j_common_ptr) srcinfo, JPOOL_IMAGE, FALSE,
- width_in_blocks, height_in_blocks, (JDIMENSION) v_samp_factor);
- }
- }
-
- info->workspace_coef_arrays = coef_arrays;
-}
-
-
-/* Transpose destination image parameters */
-
-LOCAL(void)
-transpose_critical_parameters (j_compress_ptr dstinfo)
-{
- int tblno, i, j, ci, itemp;
- jpeg_component_info *compptr;
- JQUANT_TBL *qtblptr;
- UINT16 qtemp;
-
- /* Transpose sampling factors */
- for (ci = 0; ci < dstinfo->num_components; ci++) {
- compptr = dstinfo->comp_info + ci;
- itemp = compptr->h_samp_factor;
- compptr->h_samp_factor = compptr->v_samp_factor;
- compptr->v_samp_factor = itemp;
- }
-
- /* Transpose quantization tables */
- for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) {
- qtblptr = dstinfo->quant_tbl_ptrs[tblno];
- if (qtblptr != NULL) {
- for (i = 0; i < DCTSIZE; i++) {
- for (j = 0; j < i; j++) {
- qtemp = qtblptr->quantval[i*DCTSIZE+j];
- qtblptr->quantval[i*DCTSIZE+j] = qtblptr->quantval[j*DCTSIZE+i];
- qtblptr->quantval[j*DCTSIZE+i] = qtemp;
- }
- }
- }
- }
-}
-
-
-/* Adjust Exif image parameters.
- *
- * We try to adjust the Tags ExifImageWidth and ExifImageHeight if possible.
- */
-
-LOCAL(void)
-adjust_exif_parameters (JOCTET FAR * data, unsigned int length,
- JDIMENSION new_width, JDIMENSION new_height)
-{
- boolean is_motorola; /* Flag for byte order */
- unsigned int number_of_tags, tagnum;
- unsigned int firstoffset, offset;
- JDIMENSION new_value;
-
- if (length < 12) return; /* Length of an IFD entry */
-
- /* Discover byte order */
- if (GETJOCTET(data[0]) == 0x49 && GETJOCTET(data[1]) == 0x49)
- is_motorola = FALSE;
- else if (GETJOCTET(data[0]) == 0x4D && GETJOCTET(data[1]) == 0x4D)
- is_motorola = TRUE;
- else
- return;
-
- /* Check Tag Mark */
- if (is_motorola) {
- if (GETJOCTET(data[2]) != 0) return;
- if (GETJOCTET(data[3]) != 0x2A) return;
- } else {
- if (GETJOCTET(data[3]) != 0) return;
- if (GETJOCTET(data[2]) != 0x2A) return;
- }
-
- /* Get first IFD offset (offset to IFD0) */
- if (is_motorola) {
- if (GETJOCTET(data[4]) != 0) return;
- if (GETJOCTET(data[5]) != 0) return;
- firstoffset = GETJOCTET(data[6]);
- firstoffset <<= 8;
- firstoffset += GETJOCTET(data[7]);
- } else {
- if (GETJOCTET(data[7]) != 0) return;
- if (GETJOCTET(data[6]) != 0) return;
- firstoffset = GETJOCTET(data[5]);
- firstoffset <<= 8;
- firstoffset += GETJOCTET(data[4]);
- }
- if (firstoffset > length - 2) return; /* check end of data segment */
-
- /* Get the number of directory entries contained in this IFD */
- if (is_motorola) {
- number_of_tags = GETJOCTET(data[firstoffset]);
- number_of_tags <<= 8;
- number_of_tags += GETJOCTET(data[firstoffset+1]);
- } else {
- number_of_tags = GETJOCTET(data[firstoffset+1]);
- number_of_tags <<= 8;
- number_of_tags += GETJOCTET(data[firstoffset]);
- }
- if (number_of_tags == 0) return;
- firstoffset += 2;
-
- /* Search for ExifSubIFD offset Tag in IFD0 */
- for (;;) {
- if (firstoffset > length - 12) return; /* check end of data segment */
- /* Get Tag number */
- if (is_motorola) {
- tagnum = GETJOCTET(data[firstoffset]);
- tagnum <<= 8;
- tagnum += GETJOCTET(data[firstoffset+1]);
- } else {
- tagnum = GETJOCTET(data[firstoffset+1]);
- tagnum <<= 8;
- tagnum += GETJOCTET(data[firstoffset]);
- }
- if (tagnum == 0x8769) break; /* found ExifSubIFD offset Tag */
- if (--number_of_tags == 0) return;
- firstoffset += 12;
- }
-
- /* Get the ExifSubIFD offset */
- if (is_motorola) {
- if (GETJOCTET(data[firstoffset+8]) != 0) return;
- if (GETJOCTET(data[firstoffset+9]) != 0) return;
- offset = GETJOCTET(data[firstoffset+10]);
- offset <<= 8;
- offset += GETJOCTET(data[firstoffset+11]);
- } else {
- if (GETJOCTET(data[firstoffset+11]) != 0) return;
- if (GETJOCTET(data[firstoffset+10]) != 0) return;
- offset = GETJOCTET(data[firstoffset+9]);
- offset <<= 8;
- offset += GETJOCTET(data[firstoffset+8]);
- }
- if (offset > length - 2) return; /* check end of data segment */
-
- /* Get the number of directory entries contained in this SubIFD */
- if (is_motorola) {
- number_of_tags = GETJOCTET(data[offset]);
- number_of_tags <<= 8;
- number_of_tags += GETJOCTET(data[offset+1]);
- } else {
- number_of_tags = GETJOCTET(data[offset+1]);
- number_of_tags <<= 8;
- number_of_tags += GETJOCTET(data[offset]);
- }
- if (number_of_tags < 2) return;
- offset += 2;
-
- /* Search for ExifImageWidth and ExifImageHeight Tags in this SubIFD */
- do {
- if (offset > length - 12) return; /* check end of data segment */
- /* Get Tag number */
- if (is_motorola) {
- tagnum = GETJOCTET(data[offset]);
- tagnum <<= 8;
- tagnum += GETJOCTET(data[offset+1]);
- } else {
- tagnum = GETJOCTET(data[offset+1]);
- tagnum <<= 8;
- tagnum += GETJOCTET(data[offset]);
- }
- if (tagnum == 0xA002 || tagnum == 0xA003) {
- if (tagnum == 0xA002)
- new_value = new_width; /* ExifImageWidth Tag */
- else
- new_value = new_height; /* ExifImageHeight Tag */
- if (is_motorola) {
- data[offset+2] = 0; /* Format = unsigned long (4 octets) */
- data[offset+3] = 4;
- data[offset+4] = 0; /* Number Of Components = 1 */
- data[offset+5] = 0;
- data[offset+6] = 0;
- data[offset+7] = 1;
- data[offset+8] = 0;
- data[offset+9] = 0;
- data[offset+10] = (JOCTET)((new_value >> 8) & 0xFF);
- data[offset+11] = (JOCTET)(new_value & 0xFF);
- } else {
- data[offset+2] = 4; /* Format = unsigned long (4 octets) */
- data[offset+3] = 0;
- data[offset+4] = 1; /* Number Of Components = 1 */
- data[offset+5] = 0;
- data[offset+6] = 0;
- data[offset+7] = 0;
- data[offset+8] = (JOCTET)(new_value & 0xFF);
- data[offset+9] = (JOCTET)((new_value >> 8) & 0xFF);
- data[offset+10] = 0;
- data[offset+11] = 0;
- }
- }
- offset += 12;
- } while (--number_of_tags);
-}
-
-
-/* Adjust output image parameters as needed.
- *
- * This must be called after jpeg_copy_critical_parameters()
- * and before jpeg_write_coefficients().
- *
- * The return value is the set of virtual coefficient arrays to be written
- * (either the ones allocated by jtransform_request_workspace, or the
- * original source data arrays). The caller will need to pass this value
- * to jpeg_write_coefficients().
- */
-
-GLOBAL(jvirt_barray_ptr *)
-jtransform_adjust_parameters (j_decompress_ptr srcinfo,
- j_compress_ptr dstinfo,
- jvirt_barray_ptr *src_coef_arrays,
- jpeg_transform_info *info)
-{
- /* If force-to-grayscale is requested, adjust destination parameters */
- if (info->force_grayscale) {
- /* First, ensure we have YCbCr or grayscale data, and that the source's
- * Y channel is full resolution. (No reasonable person would make Y
- * be less than full resolution, so actually coping with that case
- * isn't worth extra code space. But we check it to avoid crashing.)
- */
- if (((dstinfo->jpeg_color_space == JCS_YCbCr &&
- dstinfo->num_components == 3) ||
- (dstinfo->jpeg_color_space == JCS_GRAYSCALE &&
- dstinfo->num_components == 1)) &&
- srcinfo->comp_info[0].h_samp_factor == srcinfo->max_h_samp_factor &&
- srcinfo->comp_info[0].v_samp_factor == srcinfo->max_v_samp_factor) {
- /* We use jpeg_set_colorspace to make sure subsidiary settings get fixed
- * properly. Among other things, it sets the target h_samp_factor &
- * v_samp_factor to 1, which typically won't match the source.
- * We have to preserve the source's quantization table number, however.
- */
- int sv_quant_tbl_no = dstinfo->comp_info[0].quant_tbl_no;
- jpeg_set_colorspace(dstinfo, JCS_GRAYSCALE);
- dstinfo->comp_info[0].quant_tbl_no = sv_quant_tbl_no;
- } else {
- /* Sorry, can't do it */
- ERREXIT(dstinfo, JERR_CONVERSION_NOTIMPL);
- }
- } else if (info->num_components == 1) {
- /* For a single-component source, we force the destination sampling factors
- * to 1x1, with or without force_grayscale. This is useful because some
- * decoders choke on grayscale images with other sampling factors.
- */
- dstinfo->comp_info[0].h_samp_factor = 1;
- dstinfo->comp_info[0].v_samp_factor = 1;
- }
-
- /* Correct the destination's image dimensions as necessary
- * for crop and rotate/flip operations.
- */
- dstinfo->image_width = info->output_width;
- dstinfo->image_height = info->output_height;
-
- /* Transpose destination image parameters */
- switch (info->transform) {
- case JXFORM_TRANSPOSE:
- case JXFORM_TRANSVERSE:
- case JXFORM_ROT_90:
- case JXFORM_ROT_270:
- transpose_critical_parameters(dstinfo);
- break;
- }
-
- /* Adjust Exif properties */
- if (srcinfo->marker_list != NULL &&
- srcinfo->marker_list->marker == JPEG_APP0+1 &&
- srcinfo->marker_list->data_length >= 6 &&
- GETJOCTET(srcinfo->marker_list->data[0]) == 0x45 &&
- GETJOCTET(srcinfo->marker_list->data[1]) == 0x78 &&
- GETJOCTET(srcinfo->marker_list->data[2]) == 0x69 &&
- GETJOCTET(srcinfo->marker_list->data[3]) == 0x66 &&
- GETJOCTET(srcinfo->marker_list->data[4]) == 0 &&
- GETJOCTET(srcinfo->marker_list->data[5]) == 0) {
- /* Suppress output of JFIF marker */
- dstinfo->write_JFIF_header = FALSE;
- /* Adjust Exif image parameters */
- if (dstinfo->image_width != srcinfo->image_width ||
- dstinfo->image_height != srcinfo->image_height)
- /* Align data segment to start of TIFF structure for parsing */
- adjust_exif_parameters(srcinfo->marker_list->data + 6,
- srcinfo->marker_list->data_length - 6,
- dstinfo->image_width, dstinfo->image_height);
- }
-
- /* Return the appropriate output data set */
- if (info->workspace_coef_arrays != NULL)
- return info->workspace_coef_arrays;
- return src_coef_arrays;
-}
-
-
-/* Execute the actual transformation, if any.
- *
- * This must be called *after* jpeg_write_coefficients, because it depends
- * on jpeg_write_coefficients to have computed subsidiary values such as
- * the per-component width and height fields in the destination object.
- *
- * Note that some transformations will modify the source data arrays!
- */
-
-GLOBAL(void)
-jtransform_execute_transform (j_decompress_ptr srcinfo,
- j_compress_ptr dstinfo,
- jvirt_barray_ptr *src_coef_arrays,
- jpeg_transform_info *info)
-{
- jvirt_barray_ptr *dst_coef_arrays = info->workspace_coef_arrays;
-
- /* Note: conditions tested here should match those in switch statement
- * in jtransform_request_workspace()
- */
- switch (info->transform) {
- case JXFORM_NONE:
- if (info->x_crop_offset != 0 || info->y_crop_offset != 0)
- do_crop(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset,
- src_coef_arrays, dst_coef_arrays);
- break;
- case JXFORM_FLIP_H:
- if (info->y_crop_offset != 0)
- do_flip_h(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset,
- src_coef_arrays, dst_coef_arrays);
- else
- do_flip_h_no_crop(srcinfo, dstinfo, info->x_crop_offset,
- src_coef_arrays);
- break;
- case JXFORM_FLIP_V:
- do_flip_v(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset,
- src_coef_arrays, dst_coef_arrays);
- break;
- case JXFORM_TRANSPOSE:
- do_transpose(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset,
- src_coef_arrays, dst_coef_arrays);
- break;
- case JXFORM_TRANSVERSE:
- do_transverse(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset,
- src_coef_arrays, dst_coef_arrays);
- break;
- case JXFORM_ROT_90:
- do_rot_90(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset,
- src_coef_arrays, dst_coef_arrays);
- break;
- case JXFORM_ROT_180:
- do_rot_180(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset,
- src_coef_arrays, dst_coef_arrays);
- break;
- case JXFORM_ROT_270:
- do_rot_270(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset,
- src_coef_arrays, dst_coef_arrays);
- break;
- }
-}
-
-/* jtransform_perfect_transform
- *
- * Determine whether lossless transformation is perfectly
- * possible for a specified image and transformation.
- *
- * Inputs:
- * image_width, image_height: source image dimensions.
- * MCU_width, MCU_height: pixel dimensions of MCU.
- * transform: transformation identifier.
- * Parameter sources from initialized jpeg_struct
- * (after reading source header):
- * image_width = cinfo.image_width
- * image_height = cinfo.image_height
- * MCU_width = cinfo.max_h_samp_factor * DCTSIZE
- * MCU_height = cinfo.max_v_samp_factor * DCTSIZE
- * Result:
- * TRUE = perfect transformation possible
- * FALSE = perfect transformation not possible
- * (may use custom action then)
- */
-
-GLOBAL(boolean)
-jtransform_perfect_transform(JDIMENSION image_width, JDIMENSION image_height,
- int MCU_width, int MCU_height,
- JXFORM_CODE transform)
-{
- boolean result = TRUE; /* initialize TRUE */
-
- switch (transform) {
- case JXFORM_FLIP_H:
- case JXFORM_ROT_270:
- if (image_width % (JDIMENSION) MCU_width)
- result = FALSE;
- break;
- case JXFORM_FLIP_V:
- case JXFORM_ROT_90:
- if (image_height % (JDIMENSION) MCU_height)
- result = FALSE;
- break;
- case JXFORM_TRANSVERSE:
- case JXFORM_ROT_180:
- if (image_width % (JDIMENSION) MCU_width)
- result = FALSE;
- if (image_height % (JDIMENSION) MCU_height)
- result = FALSE;
- break;
- }
-
- return result;
-}
-
-#endif /* TRANSFORMS_SUPPORTED */
-
-
-/* Setup decompression object to save desired markers in memory.
- * This must be called before jpeg_read_header() to have the desired effect.
- */
-
-GLOBAL(void)
-jcopy_markers_setup (j_decompress_ptr srcinfo, JCOPY_OPTION option)
-{
-#ifdef SAVE_MARKERS_SUPPORTED
- int m;
-
- /* Save comments except under NONE option */
- if (option != JCOPYOPT_NONE) {
- jpeg_save_markers(srcinfo, JPEG_COM, 0xFFFF);
- }
- /* Save all types of APPn markers iff ALL option */
- if (option == JCOPYOPT_ALL) {
- for (m = 0; m < 16; m++)
- jpeg_save_markers(srcinfo, JPEG_APP0 + m, 0xFFFF);
- }
-#endif /* SAVE_MARKERS_SUPPORTED */
-}
-
-/* Copy markers saved in the given source object to the destination object.
- * This should be called just after jpeg_start_compress() or
- * jpeg_write_coefficients().
- * Note that those routines will have written the SOI, and also the
- * JFIF APP0 or Adobe APP14 markers if selected.
- */
-
-GLOBAL(void)
-jcopy_markers_execute (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
- JCOPY_OPTION option)
-{
- jpeg_saved_marker_ptr marker;
-
- /* In the current implementation, we don't actually need to examine the
- * option flag here; we just copy everything that got saved.
- * But to avoid confusion, we do not output JFIF and Adobe APP14 markers
- * if the encoder library already wrote one.
- */
- for (marker = srcinfo->marker_list; marker != NULL; marker = marker->next) {
- if (dstinfo->write_JFIF_header &&
- marker->marker == JPEG_APP0 &&
- marker->data_length >= 5 &&
- GETJOCTET(marker->data[0]) == 0x4A &&
- GETJOCTET(marker->data[1]) == 0x46 &&
- GETJOCTET(marker->data[2]) == 0x49 &&
- GETJOCTET(marker->data[3]) == 0x46 &&
- GETJOCTET(marker->data[4]) == 0)
- continue; /* reject duplicate JFIF */
- if (dstinfo->write_Adobe_marker &&
- marker->marker == JPEG_APP0+14 &&
- marker->data_length >= 5 &&
- GETJOCTET(marker->data[0]) == 0x41 &&
- GETJOCTET(marker->data[1]) == 0x64 &&
- GETJOCTET(marker->data[2]) == 0x6F &&
- GETJOCTET(marker->data[3]) == 0x62 &&
- GETJOCTET(marker->data[4]) == 0x65)
- continue; /* reject duplicate Adobe */
-#ifdef NEED_FAR_POINTERS
- /* We could use jpeg_write_marker if the data weren't FAR... */
- {
- unsigned int i;
- jpeg_write_m_header(dstinfo, marker->marker, marker->data_length);
- for (i = 0; i < marker->data_length; i++)
- jpeg_write_m_byte(dstinfo, marker->data[i]);
- }
-#else
- jpeg_write_marker(dstinfo, marker->marker,
- marker->data, marker->data_length);
-#endif
- }
-}
projects / opencv / blobdiff